Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

[linux-2.6-block.git] / drivers / scsi / mpt3sas / mpt3sas_base.c

/*
 * This is the Fusion MPT base driver providing common API layer interface
 * for access to MPT (Message Passing Technology) firmware.
 *
 * This code is based on drivers/scsi/mpt3sas/mpt3sas_base.c
 * Copyright (C) 2012-2014  LSI Corporation
 * Copyright (C) 2013-2014 Avago Technologies
 *  (mailto: MPT-FusionLinux.pdl@avagotech.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * NO WARRANTY
 * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
 * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
 * solely responsible for determining the appropriateness of using and
 * distributing the Program and assumes all risks associated with its
 * exercise of rights under this Agreement, including but not limited to
 * the risks and costs of program errors, damage to or loss of data,
 * programs or equipment, and unavailability or interruption of operations.

 * DISCLAIMER OF LIABILITY
 * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
 * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/time.h>
#include <linux/ktime.h>
#include <linux/kthread.h>
#include <asm/page.h>        /* To get host page size per arch */
#include <linux/aer.h>


#include "mpt3sas_base.h"

static MPT_CALLBACK     mpt_callbacks[MPT_MAX_CALLBACKS];


#define FAULT_POLLING_INTERVAL 1000 /* in milliseconds */

 /* maximum controller queue depth */
#define MAX_HBA_QUEUE_DEPTH     30000
#define MAX_CHAIN_DEPTH         100000
static int max_queue_depth = -1;
module_param(max_queue_depth, int, 0);
MODULE_PARM_DESC(max_queue_depth, " max controller queue depth ");

static int max_sgl_entries = -1;
module_param(max_sgl_entries, int, 0);
MODULE_PARM_DESC(max_sgl_entries, " max sg entries ");

static int msix_disable = -1;
module_param(msix_disable, int, 0);
MODULE_PARM_DESC(msix_disable, " disable msix routed interrupts (default=0)");

static int smp_affinity_enable = 1;
module_param(smp_affinity_enable, int, S_IRUGO);
MODULE_PARM_DESC(smp_affinity_enable, "SMP affinity feature enable/disbale Default: enable(1)");

static int max_msix_vectors = -1;
module_param(max_msix_vectors, int, 0);
MODULE_PARM_DESC(max_msix_vectors,
        " max msix vectors");

static int mpt3sas_fwfault_debug;
MODULE_PARM_DESC(mpt3sas_fwfault_debug,
        " enable detection of firmware fault and halt firmware - (default=0)");

static int
_base_get_ioc_facts(struct MPT3SAS_ADAPTER *ioc);

/**
 * _scsih_set_fwfault_debug - global setting of ioc->fwfault_debug.
 *
 */
static int
_scsih_set_fwfault_debug(const char *val, const struct kernel_param *kp)
{
        int ret = param_set_int(val, kp);
        struct MPT3SAS_ADAPTER *ioc;

        if (ret)
                return ret;

        /* global ioc spinlock to protect controller list on list operations */
        pr_info("setting fwfault_debug(%d)\n", mpt3sas_fwfault_debug);
        spin_lock(&gioc_lock);
        list_for_each_entry(ioc, &mpt3sas_ioc_list, list)
                ioc->fwfault_debug = mpt3sas_fwfault_debug;
        spin_unlock(&gioc_lock);
        return 0;
}
module_param_call(mpt3sas_fwfault_debug, _scsih_set_fwfault_debug,
        param_get_int, &mpt3sas_fwfault_debug, 0644);

/**
 * _base_clone_reply_to_sys_mem - copies reply to reply free iomem
 *                                in BAR0 space.
 *
 * @ioc: per adapter object
 * @reply: reply message frame(lower 32bit addr)
 * @index: System request message index.
 *
 * @Returns - Nothing
 */
static void
_base_clone_reply_to_sys_mem(struct MPT3SAS_ADAPTER *ioc, u32 reply,
                u32 index)
{
        /*
         * 256 is offset within sys register.
         * 256 offset MPI frame starts. Max MPI frame supported is 32.
         * 32 * 128 = 4K. From here, Clone of reply free for mcpu starts
         */
        u16 cmd_credit = ioc->facts.RequestCredit + 1;
        void __iomem *reply_free_iomem = (void __iomem *)ioc->chip +
                        MPI_FRAME_START_OFFSET +
                        (cmd_credit * ioc->request_sz) + (index * sizeof(u32));

        writel(reply, reply_free_iomem);
}

/**
 * _base_clone_mpi_to_sys_mem - Writes/copies MPI frames
 *                              to system/BAR0 region.
 *
 * @dst_iomem: Pointer to the destinaltion location in BAR0 space.
 * @src: Pointer to the Source data.
 * @size: Size of data to be copied.
 */
static void
_base_clone_mpi_to_sys_mem(void *dst_iomem, void *src, u32 size)
{
        int i;
        u32 *src_virt_mem = (u32 *)src;

        for (i = 0; i < size/4; i++)
                writel((u32)src_virt_mem[i],
                                (void __iomem *)dst_iomem + (i * 4));
}

/**
 * _base_clone_to_sys_mem - Writes/copies data to system/BAR0 region
 *
 * @dst_iomem: Pointer to the destination location in BAR0 space.
 * @src: Pointer to the Source data.
 * @size: Size of data to be copied.
 */
static void
_base_clone_to_sys_mem(void __iomem *dst_iomem, void *src, u32 size)
{
        int i;
        u32 *src_virt_mem = (u32 *)(src);

        for (i = 0; i < size/4; i++)
                writel((u32)src_virt_mem[i],
                        (void __iomem *)dst_iomem + (i * 4));
}

/**
 * _base_get_chain - Calculates and Returns virtual chain address
 *                       for the provided smid in BAR0 space.
 *
 * @ioc: per adapter object
 * @smid: system request message index
 * @sge_chain_count: Scatter gather chain count.
 *
 * @Return: chain address.
 */
static inline void __iomem*
_base_get_chain(struct MPT3SAS_ADAPTER *ioc, u16 smid,
                u8 sge_chain_count)
{
        void __iomem *base_chain, *chain_virt;
        u16 cmd_credit = ioc->facts.RequestCredit + 1;

        base_chain  = (void __iomem *)ioc->chip + MPI_FRAME_START_OFFSET +
                (cmd_credit * ioc->request_sz) +
                REPLY_FREE_POOL_SIZE;
        chain_virt = base_chain + (smid * ioc->facts.MaxChainDepth *
                        ioc->request_sz) + (sge_chain_count * ioc->request_sz);
        return chain_virt;
}

/**
 * _base_get_chain_phys - Calculates and Returns physical address
 *                      in BAR0 for scatter gather chains, for
 *                      the provided smid.
 *
 * @ioc: per adapter object
 * @smid: system request message index
 * @sge_chain_count: Scatter gather chain count.
 *
 * @Return - Physical chain address.
 */
static inline phys_addr_t
_base_get_chain_phys(struct MPT3SAS_ADAPTER *ioc, u16 smid,
                u8 sge_chain_count)
{
        phys_addr_t base_chain_phys, chain_phys;
        u16 cmd_credit = ioc->facts.RequestCredit + 1;

        base_chain_phys  = ioc->chip_phys + MPI_FRAME_START_OFFSET +
                (cmd_credit * ioc->request_sz) +
                REPLY_FREE_POOL_SIZE;
        chain_phys = base_chain_phys + (smid * ioc->facts.MaxChainDepth *
                        ioc->request_sz) + (sge_chain_count * ioc->request_sz);
        return chain_phys;
}

/**
 * _base_get_buffer_bar0 - Calculates and Returns BAR0 mapped Host
 *                      buffer address for the provided smid.
 *                      (Each smid can have 64K starts from 17024)
 *
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * @Returns - Pointer to buffer location in BAR0.
 */

static void __iomem *
_base_get_buffer_bar0(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        u16 cmd_credit = ioc->facts.RequestCredit + 1;
        // Added extra 1 to reach end of chain.
        void __iomem *chain_end = _base_get_chain(ioc,
                        cmd_credit + 1,
                        ioc->facts.MaxChainDepth);
        return chain_end + (smid * 64 * 1024);
}

/**
 * _base_get_buffer_phys_bar0 - Calculates and Returns BAR0 mapped
 *              Host buffer Physical address for the provided smid.
 *              (Each smid can have 64K starts from 17024)
 *
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * @Returns - Pointer to buffer location in BAR0.
 */
static phys_addr_t
_base_get_buffer_phys_bar0(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        u16 cmd_credit = ioc->facts.RequestCredit + 1;
        phys_addr_t chain_end_phys = _base_get_chain_phys(ioc,
                        cmd_credit + 1,
                        ioc->facts.MaxChainDepth);
        return chain_end_phys + (smid * 64 * 1024);
}

/**
 * _base_get_chain_buffer_dma_to_chain_buffer - Iterates chain
 *                      lookup list and Provides chain_buffer
 *                      address for the matching dma address.
 *                      (Each smid can have 64K starts from 17024)
 *
 * @ioc: per adapter object
 * @chain_buffer_dma: Chain buffer dma address.
 *
 * @Returns - Pointer to chain buffer. Or Null on Failure.
 */
static void *
_base_get_chain_buffer_dma_to_chain_buffer(struct MPT3SAS_ADAPTER *ioc,
                dma_addr_t chain_buffer_dma)
{
        u16 index;

        for (index = 0; index < ioc->chain_depth; index++) {
                if (ioc->chain_lookup[index].chain_buffer_dma ==
                                chain_buffer_dma)
                        return ioc->chain_lookup[index].chain_buffer;
        }
        pr_info(MPT3SAS_FMT
            "Provided chain_buffer_dma address is not in the lookup list\n",
            ioc->name);
        return NULL;
}

/**
 * _clone_sg_entries -  MPI EP's scsiio and config requests
 *                      are handled here. Base function for
 *                      double buffering, before submitting
 *                      the requests.
 *
 * @ioc: per adapter object.
 * @mpi_request: mf request pointer.
 * @smid: system request message index.
 *
 * @Returns: Nothing.
 */
static void _clone_sg_entries(struct MPT3SAS_ADAPTER *ioc,
                void *mpi_request, u16 smid)
{
        Mpi2SGESimple32_t *sgel, *sgel_next;
        u32  sgl_flags, sge_chain_count = 0;
        bool is_write = 0;
        u16 i = 0;
        void __iomem *buffer_iomem;
        phys_addr_t buffer_iomem_phys;
        void __iomem *buff_ptr;
        phys_addr_t buff_ptr_phys;
        void __iomem *dst_chain_addr[MCPU_MAX_CHAINS_PER_IO];
        void *src_chain_addr[MCPU_MAX_CHAINS_PER_IO];
        phys_addr_t dst_addr_phys;
        MPI2RequestHeader_t *request_hdr;
        struct scsi_cmnd *scmd;
        struct scatterlist *sg_scmd = NULL;
        int is_scsiio_req = 0;

        request_hdr = (MPI2RequestHeader_t *) mpi_request;

        if (request_hdr->Function == MPI2_FUNCTION_SCSI_IO_REQUEST) {
                Mpi25SCSIIORequest_t *scsiio_request =
                        (Mpi25SCSIIORequest_t *)mpi_request;
                sgel = (Mpi2SGESimple32_t *) &scsiio_request->SGL;
                is_scsiio_req = 1;
        } else if (request_hdr->Function == MPI2_FUNCTION_CONFIG) {
                Mpi2ConfigRequest_t  *config_req =
                        (Mpi2ConfigRequest_t *)mpi_request;
                sgel = (Mpi2SGESimple32_t *) &config_req->PageBufferSGE;
        } else
                return;

        /* From smid we can get scsi_cmd, once we have sg_scmd,
         * we just need to get sg_virt and sg_next to get virual
         * address associated with sgel->Address.
         */

        if (is_scsiio_req) {
                /* Get scsi_cmd using smid */
                scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
                if (scmd == NULL) {
                        pr_err(MPT3SAS_FMT "scmd is NULL\n", ioc->name);
                        return;
                }

                /* Get sg_scmd from scmd provided */
                sg_scmd = scsi_sglist(scmd);
        }

        /*
         * 0 - 255      System register
         * 256 - 4352   MPI Frame. (This is based on maxCredit 32)
         * 4352 - 4864  Reply_free pool (512 byte is reserved
         *              considering maxCredit 32. Reply need extra
         *              room, for mCPU case kept four times of
         *              maxCredit).
         * 4864 - 17152 SGE chain element. (32cmd * 3 chain of
         *              128 byte size = 12288)
         * 17152 - x    Host buffer mapped with smid.
         *              (Each smid can have 64K Max IO.)
         * BAR0+Last 1K MSIX Addr and Data
         * Total size in use 2113664 bytes of 4MB BAR0
         */

        buffer_iomem = _base_get_buffer_bar0(ioc, smid);
        buffer_iomem_phys = _base_get_buffer_phys_bar0(ioc, smid);

        buff_ptr = buffer_iomem;
        buff_ptr_phys = buffer_iomem_phys;
        WARN_ON(buff_ptr_phys > U32_MAX);

        if (sgel->FlagsLength &
                        (MPI2_SGE_FLAGS_HOST_TO_IOC << MPI2_SGE_FLAGS_SHIFT))
                is_write = 1;

        for (i = 0; i < MPT_MIN_PHYS_SEGMENTS + ioc->facts.MaxChainDepth; i++) {

                sgl_flags = (sgel->FlagsLength >> MPI2_SGE_FLAGS_SHIFT);

                switch (sgl_flags & MPI2_SGE_FLAGS_ELEMENT_MASK) {
                case MPI2_SGE_FLAGS_CHAIN_ELEMENT:
                        /*
                         * Helper function which on passing
                         * chain_buffer_dma returns chain_buffer. Get
                         * the virtual address for sgel->Address
                         */
                        sgel_next =
                                _base_get_chain_buffer_dma_to_chain_buffer(ioc,
                                                sgel->Address);
                        if (sgel_next == NULL)
                                return;
                        /*
                         * This is coping 128 byte chain
                         * frame (not a host buffer)
                         */
                        dst_chain_addr[sge_chain_count] =
                                _base_get_chain(ioc,
                                        smid, sge_chain_count);
                        src_chain_addr[sge_chain_count] =
                                                (void *) sgel_next;
                        dst_addr_phys = _base_get_chain_phys(ioc,
                                                smid, sge_chain_count);
                        WARN_ON(dst_addr_phys > U32_MAX);
                        sgel->Address = (u32)dst_addr_phys;
                        sgel = sgel_next;
                        sge_chain_count++;
                        break;
                case MPI2_SGE_FLAGS_SIMPLE_ELEMENT:
                        if (is_write) {
                                if (is_scsiio_req) {
                                        _base_clone_to_sys_mem(buff_ptr,
                                            sg_virt(sg_scmd),
                                            (sgel->FlagsLength & 0x00ffffff));
                                        /*
                                         * FIXME: this relies on a a zero
                                         * PCI mem_offset.
                                         */
                                        sgel->Address = (u32)buff_ptr_phys;
                                } else {
                                        _base_clone_to_sys_mem(buff_ptr,
                                            ioc->config_vaddr,
                                            (sgel->FlagsLength & 0x00ffffff));
                                        sgel->Address = (u32)buff_ptr_phys;
                                }
                        }
                        buff_ptr += (sgel->FlagsLength & 0x00ffffff);
                        buff_ptr_phys += (sgel->FlagsLength & 0x00ffffff);
                        if ((sgel->FlagsLength &
                            (MPI2_SGE_FLAGS_END_OF_BUFFER
                                        << MPI2_SGE_FLAGS_SHIFT)))
                                goto eob_clone_chain;
                        else {
                                /*
                                 * Every single element in MPT will have
                                 * associated sg_next. Better to sanity that
                                 * sg_next is not NULL, but it will be a bug
                                 * if it is null.
                                 */
                                if (is_scsiio_req) {
                                        sg_scmd = sg_next(sg_scmd);
                                        if (sg_scmd)
                                                sgel++;
                                        else
                                                goto eob_clone_chain;
                                }
                        }
                        break;
                }
        }

eob_clone_chain:
        for (i = 0; i < sge_chain_count; i++) {
                if (is_scsiio_req)
                        _base_clone_to_sys_mem(dst_chain_addr[i],
                                src_chain_addr[i], ioc->request_sz);
        }
}

/**
 *  mpt3sas_remove_dead_ioc_func - kthread context to remove dead ioc
 * @arg: input argument, used to derive ioc
 *
 * Return 0 if controller is removed from pci subsystem.
 * Return -1 for other case.
 */
static int mpt3sas_remove_dead_ioc_func(void *arg)
{
        struct MPT3SAS_ADAPTER *ioc = (struct MPT3SAS_ADAPTER *)arg;
        struct pci_dev *pdev;

        if ((ioc == NULL))
                return -1;

        pdev = ioc->pdev;
        if ((pdev == NULL))
                return -1;
        pci_stop_and_remove_bus_device_locked(pdev);
        return 0;
}

/**
 * _base_fault_reset_work - workq handling ioc fault conditions
 * @work: input argument, used to derive ioc
 * Context: sleep.
 *
 * Return nothing.
 */
static void
_base_fault_reset_work(struct work_struct *work)
{
        struct MPT3SAS_ADAPTER *ioc =
            container_of(work, struct MPT3SAS_ADAPTER, fault_reset_work.work);
        unsigned long    flags;
        u32 doorbell;
        int rc;
        struct task_struct *p;


        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        if (ioc->shost_recovery || ioc->pci_error_recovery)
                goto rearm_timer;
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);

        doorbell = mpt3sas_base_get_iocstate(ioc, 0);
        if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_MASK) {
                pr_err(MPT3SAS_FMT "SAS host is non-operational !!!!\n",
                    ioc->name);

                /* It may be possible that EEH recovery can resolve some of
                 * pci bus failure issues rather removing the dead ioc function
                 * by considering controller is in a non-operational state. So
                 * here priority is given to the EEH recovery. If it doesn't
                 * not resolve this issue, mpt3sas driver will consider this
                 * controller to non-operational state and remove the dead ioc
                 * function.
                 */
                if (ioc->non_operational_loop++ < 5) {
                        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock,
                                                         flags);
                        goto rearm_timer;
                }

                /*
                 * Call _scsih_flush_pending_cmds callback so that we flush all
                 * pending commands back to OS. This call is required to aovid
                 * deadlock at block layer. Dead IOC will fail to do diag reset,
                 * and this call is safe since dead ioc will never return any
                 * command back from HW.
                 */
                ioc->schedule_dead_ioc_flush_running_cmds(ioc);
                /*
                 * Set remove_host flag early since kernel thread will
                 * take some time to execute.
                 */
                ioc->remove_host = 1;
                /*Remove the Dead Host */
                p = kthread_run(mpt3sas_remove_dead_ioc_func, ioc,
                    "%s_dead_ioc_%d", ioc->driver_name, ioc->id);
                if (IS_ERR(p))
                        pr_err(MPT3SAS_FMT
                        "%s: Running mpt3sas_dead_ioc thread failed !!!!\n",
                        ioc->name, __func__);
                else
                        pr_err(MPT3SAS_FMT
                        "%s: Running mpt3sas_dead_ioc thread success !!!!\n",
                        ioc->name, __func__);
                return; /* don't rearm timer */
        }

        ioc->non_operational_loop = 0;

        if ((doorbell & MPI2_IOC_STATE_MASK) != MPI2_IOC_STATE_OPERATIONAL) {
                rc = mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
                pr_warn(MPT3SAS_FMT "%s: hard reset: %s\n", ioc->name,
                    __func__, (rc == 0) ? "success" : "failed");
                doorbell = mpt3sas_base_get_iocstate(ioc, 0);
                if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT)
                        mpt3sas_base_fault_info(ioc, doorbell &
                            MPI2_DOORBELL_DATA_MASK);
                if (rc && (doorbell & MPI2_IOC_STATE_MASK) !=
                    MPI2_IOC_STATE_OPERATIONAL)
                        return; /* don't rearm timer */
        }

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
 rearm_timer:
        if (ioc->fault_reset_work_q)
                queue_delayed_work(ioc->fault_reset_work_q,
                    &ioc->fault_reset_work,
                    msecs_to_jiffies(FAULT_POLLING_INTERVAL));
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
}

/**
 * mpt3sas_base_start_watchdog - start the fault_reset_work_q
 * @ioc: per adapter object
 * Context: sleep.
 *
 * Return nothing.
 */
void
mpt3sas_base_start_watchdog(struct MPT3SAS_ADAPTER *ioc)
{
        unsigned long    flags;

        if (ioc->fault_reset_work_q)
                return;

        /* initialize fault polling */

        INIT_DELAYED_WORK(&ioc->fault_reset_work, _base_fault_reset_work);
        snprintf(ioc->fault_reset_work_q_name,
            sizeof(ioc->fault_reset_work_q_name), "poll_%s%d_status",
            ioc->driver_name, ioc->id);
        ioc->fault_reset_work_q =
                create_singlethread_workqueue(ioc->fault_reset_work_q_name);
        if (!ioc->fault_reset_work_q) {
                pr_err(MPT3SAS_FMT "%s: failed (line=%d)\n",
                    ioc->name, __func__, __LINE__);
                        return;
        }
        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        if (ioc->fault_reset_work_q)
                queue_delayed_work(ioc->fault_reset_work_q,
                    &ioc->fault_reset_work,
                    msecs_to_jiffies(FAULT_POLLING_INTERVAL));
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
}

/**
 * mpt3sas_base_stop_watchdog - stop the fault_reset_work_q
 * @ioc: per adapter object
 * Context: sleep.
 *
 * Return nothing.
 */
void
mpt3sas_base_stop_watchdog(struct MPT3SAS_ADAPTER *ioc)
{
        unsigned long flags;
        struct workqueue_struct *wq;

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        wq = ioc->fault_reset_work_q;
        ioc->fault_reset_work_q = NULL;
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
        if (wq) {
                if (!cancel_delayed_work_sync(&ioc->fault_reset_work))
                        flush_workqueue(wq);
                destroy_workqueue(wq);
        }
}

/**
 * mpt3sas_base_fault_info - verbose translation of firmware FAULT code
 * @ioc: per adapter object
 * @fault_code: fault code
 *
 * Return nothing.
 */
void
mpt3sas_base_fault_info(struct MPT3SAS_ADAPTER *ioc , u16 fault_code)
{
        pr_err(MPT3SAS_FMT "fault_state(0x%04x)!\n",
            ioc->name, fault_code);
}

/**
 * mpt3sas_halt_firmware - halt's mpt controller firmware
 * @ioc: per adapter object
 *
 * For debugging timeout related issues.  Writing 0xCOFFEE00
 * to the doorbell register will halt controller firmware. With
 * the purpose to stop both driver and firmware, the enduser can
 * obtain a ring buffer from controller UART.
 */
void
mpt3sas_halt_firmware(struct MPT3SAS_ADAPTER *ioc)
{
        u32 doorbell;

        if (!ioc->fwfault_debug)
                return;

        dump_stack();

        doorbell = readl(&ioc->chip->Doorbell);
        if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT)
                mpt3sas_base_fault_info(ioc , doorbell);
        else {
                writel(0xC0FFEE00, &ioc->chip->Doorbell);
                pr_err(MPT3SAS_FMT "Firmware is halted due to command timeout\n",
                        ioc->name);
        }

        if (ioc->fwfault_debug == 2)
                for (;;)
                        ;
        else
                panic("panic in %s\n", __func__);
}

/**
 * _base_sas_ioc_info - verbose translation of the ioc status
 * @ioc: per adapter object
 * @mpi_reply: reply mf payload returned from firmware
 * @request_hdr: request mf
 *
 * Return nothing.
 */
static void
_base_sas_ioc_info(struct MPT3SAS_ADAPTER *ioc, MPI2DefaultReply_t *mpi_reply,
        MPI2RequestHeader_t *request_hdr)
{
        u16 ioc_status = le16_to_cpu(mpi_reply->IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        char *desc = NULL;
        u16 frame_sz;
        char *func_str = NULL;

        /* SCSI_IO, RAID_PASS are handled from _scsih_scsi_ioc_info */
        if (request_hdr->Function == MPI2_FUNCTION_SCSI_IO_REQUEST ||
            request_hdr->Function == MPI2_FUNCTION_RAID_SCSI_IO_PASSTHROUGH ||
            request_hdr->Function == MPI2_FUNCTION_EVENT_NOTIFICATION)
                return;

        if (ioc_status == MPI2_IOCSTATUS_CONFIG_INVALID_PAGE)
                return;

        switch (ioc_status) {

/****************************************************************************
*  Common IOCStatus values for all replies
****************************************************************************/

        case MPI2_IOCSTATUS_INVALID_FUNCTION:
                desc = "invalid function";
                break;
        case MPI2_IOCSTATUS_BUSY:
                desc = "busy";
                break;
        case MPI2_IOCSTATUS_INVALID_SGL:
                desc = "invalid sgl";
                break;
        case MPI2_IOCSTATUS_INTERNAL_ERROR:
                desc = "internal error";
                break;
        case MPI2_IOCSTATUS_INVALID_VPID:
                desc = "invalid vpid";
                break;
        case MPI2_IOCSTATUS_INSUFFICIENT_RESOURCES:
                desc = "insufficient resources";
                break;
        case MPI2_IOCSTATUS_INSUFFICIENT_POWER:
                desc = "insufficient power";
                break;
        case MPI2_IOCSTATUS_INVALID_FIELD:
                desc = "invalid field";
                break;
        case MPI2_IOCSTATUS_INVALID_STATE:
                desc = "invalid state";
                break;
        case MPI2_IOCSTATUS_OP_STATE_NOT_SUPPORTED:
                desc = "op state not supported";
                break;

/****************************************************************************
*  Config IOCStatus values
****************************************************************************/

        case MPI2_IOCSTATUS_CONFIG_INVALID_ACTION:
                desc = "config invalid action";
                break;
        case MPI2_IOCSTATUS_CONFIG_INVALID_TYPE:
                desc = "config invalid type";
                break;
        case MPI2_IOCSTATUS_CONFIG_INVALID_PAGE:
                desc = "config invalid page";
                break;
        case MPI2_IOCSTATUS_CONFIG_INVALID_DATA:
                desc = "config invalid data";
                break;
        case MPI2_IOCSTATUS_CONFIG_NO_DEFAULTS:
                desc = "config no defaults";
                break;
        case MPI2_IOCSTATUS_CONFIG_CANT_COMMIT:
                desc = "config cant commit";
                break;

/****************************************************************************
*  SCSI IO Reply
****************************************************************************/

        case MPI2_IOCSTATUS_SCSI_RECOVERED_ERROR:
        case MPI2_IOCSTATUS_SCSI_INVALID_DEVHANDLE:
        case MPI2_IOCSTATUS_SCSI_DEVICE_NOT_THERE:
        case MPI2_IOCSTATUS_SCSI_DATA_OVERRUN:
        case MPI2_IOCSTATUS_SCSI_DATA_UNDERRUN:
        case MPI2_IOCSTATUS_SCSI_IO_DATA_ERROR:
        case MPI2_IOCSTATUS_SCSI_PROTOCOL_ERROR:
        case MPI2_IOCSTATUS_SCSI_TASK_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_RESIDUAL_MISMATCH:
        case MPI2_IOCSTATUS_SCSI_TASK_MGMT_FAILED:
        case MPI2_IOCSTATUS_SCSI_IOC_TERMINATED:
        case MPI2_IOCSTATUS_SCSI_EXT_TERMINATED:
                break;

/****************************************************************************
*  For use by SCSI Initiator and SCSI Target end-to-end data protection
****************************************************************************/

        case MPI2_IOCSTATUS_EEDP_GUARD_ERROR:
                desc = "eedp guard error";
                break;
        case MPI2_IOCSTATUS_EEDP_REF_TAG_ERROR:
                desc = "eedp ref tag error";
                break;
        case MPI2_IOCSTATUS_EEDP_APP_TAG_ERROR:
                desc = "eedp app tag error";
                break;

/****************************************************************************
*  SCSI Target values
****************************************************************************/

        case MPI2_IOCSTATUS_TARGET_INVALID_IO_INDEX:
                desc = "target invalid io index";
                break;
        case MPI2_IOCSTATUS_TARGET_ABORTED:
                desc = "target aborted";
                break;
        case MPI2_IOCSTATUS_TARGET_NO_CONN_RETRYABLE:
                desc = "target no conn retryable";
                break;
        case MPI2_IOCSTATUS_TARGET_NO_CONNECTION:
                desc = "target no connection";
                break;
        case MPI2_IOCSTATUS_TARGET_XFER_COUNT_MISMATCH:
                desc = "target xfer count mismatch";
                break;
        case MPI2_IOCSTATUS_TARGET_DATA_OFFSET_ERROR:
                desc = "target data offset error";
                break;
        case MPI2_IOCSTATUS_TARGET_TOO_MUCH_WRITE_DATA:
                desc = "target too much write data";
                break;
        case MPI2_IOCSTATUS_TARGET_IU_TOO_SHORT:
                desc = "target iu too short";
                break;
        case MPI2_IOCSTATUS_TARGET_ACK_NAK_TIMEOUT:
                desc = "target ack nak timeout";
                break;
        case MPI2_IOCSTATUS_TARGET_NAK_RECEIVED:
                desc = "target nak received";
                break;

/****************************************************************************
*  Serial Attached SCSI values
****************************************************************************/

        case MPI2_IOCSTATUS_SAS_SMP_REQUEST_FAILED:
                desc = "smp request failed";
                break;
        case MPI2_IOCSTATUS_SAS_SMP_DATA_OVERRUN:
                desc = "smp data overrun";
                break;

/****************************************************************************
*  Diagnostic Buffer Post / Diagnostic Release values
****************************************************************************/

        case MPI2_IOCSTATUS_DIAGNOSTIC_RELEASED:
                desc = "diagnostic released";
                break;
        default:
                break;
        }

        if (!desc)
                return;

        switch (request_hdr->Function) {
        case MPI2_FUNCTION_CONFIG:
                frame_sz = sizeof(Mpi2ConfigRequest_t) + ioc->sge_size;
                func_str = "config_page";
                break;
        case MPI2_FUNCTION_SCSI_TASK_MGMT:
                frame_sz = sizeof(Mpi2SCSITaskManagementRequest_t);
                func_str = "task_mgmt";
                break;
        case MPI2_FUNCTION_SAS_IO_UNIT_CONTROL:
                frame_sz = sizeof(Mpi2SasIoUnitControlRequest_t);
                func_str = "sas_iounit_ctl";
                break;
        case MPI2_FUNCTION_SCSI_ENCLOSURE_PROCESSOR:
                frame_sz = sizeof(Mpi2SepRequest_t);
                func_str = "enclosure";
                break;
        case MPI2_FUNCTION_IOC_INIT:
                frame_sz = sizeof(Mpi2IOCInitRequest_t);
                func_str = "ioc_init";
                break;
        case MPI2_FUNCTION_PORT_ENABLE:
                frame_sz = sizeof(Mpi2PortEnableRequest_t);
                func_str = "port_enable";
                break;
        case MPI2_FUNCTION_SMP_PASSTHROUGH:
                frame_sz = sizeof(Mpi2SmpPassthroughRequest_t) + ioc->sge_size;
                func_str = "smp_passthru";
                break;
        case MPI2_FUNCTION_NVME_ENCAPSULATED:
                frame_sz = sizeof(Mpi26NVMeEncapsulatedRequest_t) +
                    ioc->sge_size;
                func_str = "nvme_encapsulated";
                break;
        default:
                frame_sz = 32;
                func_str = "unknown";
                break;
        }

        pr_warn(MPT3SAS_FMT "ioc_status: %s(0x%04x), request(0x%p),(%s)\n",
                ioc->name, desc, ioc_status, request_hdr, func_str);

        _debug_dump_mf(request_hdr, frame_sz/4);
}

/**
 * _base_display_event_data - verbose translation of firmware asyn events
 * @ioc: per adapter object
 * @mpi_reply: reply mf payload returned from firmware
 *
 * Return nothing.
 */
static void
_base_display_event_data(struct MPT3SAS_ADAPTER *ioc,
        Mpi2EventNotificationReply_t *mpi_reply)
{
        char *desc = NULL;
        u16 event;

        if (!(ioc->logging_level & MPT_DEBUG_EVENTS))
                return;

        event = le16_to_cpu(mpi_reply->Event);

        switch (event) {
        case MPI2_EVENT_LOG_DATA:
                desc = "Log Data";
                break;
        case MPI2_EVENT_STATE_CHANGE:
                desc = "Status Change";
                break;
        case MPI2_EVENT_HARD_RESET_RECEIVED:
                desc = "Hard Reset Received";
                break;
        case MPI2_EVENT_EVENT_CHANGE:
                desc = "Event Change";
                break;
        case MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE:
                desc = "Device Status Change";
                break;
        case MPI2_EVENT_IR_OPERATION_STATUS:
                if (!ioc->hide_ir_msg)
                        desc = "IR Operation Status";
                break;
        case MPI2_EVENT_SAS_DISCOVERY:
        {
                Mpi2EventDataSasDiscovery_t *event_data =
                    (Mpi2EventDataSasDiscovery_t *)mpi_reply->EventData;
                pr_info(MPT3SAS_FMT "Discovery: (%s)", ioc->name,
                    (event_data->ReasonCode == MPI2_EVENT_SAS_DISC_RC_STARTED) ?
                    "start" : "stop");
                if (event_data->DiscoveryStatus)
                        pr_cont(" discovery_status(0x%08x)",
                            le32_to_cpu(event_data->DiscoveryStatus));
                pr_cont("\n");
                return;
        }
        case MPI2_EVENT_SAS_BROADCAST_PRIMITIVE:
                desc = "SAS Broadcast Primitive";
                break;
        case MPI2_EVENT_SAS_INIT_DEVICE_STATUS_CHANGE:
                desc = "SAS Init Device Status Change";
                break;
        case MPI2_EVENT_SAS_INIT_TABLE_OVERFLOW:
                desc = "SAS Init Table Overflow";
                break;
        case MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST:
                desc = "SAS Topology Change List";
                break;
        case MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE:
                desc = "SAS Enclosure Device Status Change";
                break;
        case MPI2_EVENT_IR_VOLUME:
                if (!ioc->hide_ir_msg)
                        desc = "IR Volume";
                break;
        case MPI2_EVENT_IR_PHYSICAL_DISK:
                if (!ioc->hide_ir_msg)
                        desc = "IR Physical Disk";
                break;
        case MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST:
                if (!ioc->hide_ir_msg)
                        desc = "IR Configuration Change List";
                break;
        case MPI2_EVENT_LOG_ENTRY_ADDED:
                if (!ioc->hide_ir_msg)
                        desc = "Log Entry Added";
                break;
        case MPI2_EVENT_TEMP_THRESHOLD:
                desc = "Temperature Threshold";
                break;
        case MPI2_EVENT_ACTIVE_CABLE_EXCEPTION:
                desc = "Cable Event";
                break;
        case MPI2_EVENT_PCIE_DEVICE_STATUS_CHANGE:
                desc = "PCIE Device Status Change";
                break;
        case MPI2_EVENT_PCIE_ENUMERATION:
        {
                Mpi26EventDataPCIeEnumeration_t *event_data =
                        (Mpi26EventDataPCIeEnumeration_t *)mpi_reply->EventData;
                pr_info(MPT3SAS_FMT "PCIE Enumeration: (%s)", ioc->name,
                           (event_data->ReasonCode ==
                                MPI26_EVENT_PCIE_ENUM_RC_STARTED) ?
                                "start" : "stop");
                if (event_data->EnumerationStatus)
                        pr_info("enumeration_status(0x%08x)",
                                   le32_to_cpu(event_data->EnumerationStatus));
                pr_info("\n");
                return;
        }
        case MPI2_EVENT_PCIE_TOPOLOGY_CHANGE_LIST:
                desc = "PCIE Topology Change List";
                break;
        }

        if (!desc)
                return;

        pr_info(MPT3SAS_FMT "%s\n", ioc->name, desc);
}

/**
 * _base_sas_log_info - verbose translation of firmware log info
 * @ioc: per adapter object
 * @log_info: log info
 *
 * Return nothing.
 */
static void
_base_sas_log_info(struct MPT3SAS_ADAPTER *ioc , u32 log_info)
{
        union loginfo_type {
                u32     loginfo;
                struct {
                        u32     subcode:16;
                        u32     code:8;
                        u32     originator:4;
                        u32     bus_type:4;
                } dw;
        };
        union loginfo_type sas_loginfo;
        char *originator_str = NULL;

        sas_loginfo.loginfo = log_info;
        if (sas_loginfo.dw.bus_type != 3 /*SAS*/)
                return;

        /* each nexus loss loginfo */
        if (log_info == 0x31170000)
                return;

        /* eat the loginfos associated with task aborts */
        if (ioc->ignore_loginfos && (log_info == 0x30050000 || log_info ==
            0x31140000 || log_info == 0x31130000))
                return;

        switch (sas_loginfo.dw.originator) {
        case 0:
                originator_str = "IOP";
                break;
        case 1:
                originator_str = "PL";
                break;
        case 2:
                if (!ioc->hide_ir_msg)
                        originator_str = "IR";
                else
                        originator_str = "WarpDrive";
                break;
        }

        pr_warn(MPT3SAS_FMT
                "log_info(0x%08x): originator(%s), code(0x%02x), sub_code(0x%04x)\n",
                ioc->name, log_info,
             originator_str, sas_loginfo.dw.code,
             sas_loginfo.dw.subcode);
}

/**
 * _base_display_reply_info -
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return nothing.
 */
static void
_base_display_reply_info(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
        u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;
        u16 ioc_status;
        u32 loginfo = 0;

        mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (unlikely(!mpi_reply)) {
                pr_err(MPT3SAS_FMT "mpi_reply not valid at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                return;
        }
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus);

        if ((ioc_status & MPI2_IOCSTATUS_MASK) &&
            (ioc->logging_level & MPT_DEBUG_REPLY)) {
                _base_sas_ioc_info(ioc , mpi_reply,
                   mpt3sas_base_get_msg_frame(ioc, smid));
        }

        if (ioc_status & MPI2_IOCSTATUS_FLAG_LOG_INFO_AVAILABLE) {
                loginfo = le32_to_cpu(mpi_reply->IOCLogInfo);
                _base_sas_log_info(ioc, loginfo);
        }

        if (ioc_status || loginfo) {
                ioc_status &= MPI2_IOCSTATUS_MASK;
                mpt3sas_trigger_mpi(ioc, ioc_status, loginfo);
        }
}

/**
 * mpt3sas_base_done - base internal command completion routine
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
u8
mpt3sas_base_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
        u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;

        mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (mpi_reply && mpi_reply->Function == MPI2_FUNCTION_EVENT_ACK)
                return mpt3sas_check_for_pending_internal_cmds(ioc, smid);

        if (ioc->base_cmds.status == MPT3_CMD_NOT_USED)
                return 1;

        ioc->base_cmds.status |= MPT3_CMD_COMPLETE;
        if (mpi_reply) {
                ioc->base_cmds.status |= MPT3_CMD_REPLY_VALID;
                memcpy(ioc->base_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
        }
        ioc->base_cmds.status &= ~MPT3_CMD_PENDING;

        complete(&ioc->base_cmds.done);
        return 1;
}

/**
 * _base_async_event - main callback handler for firmware asyn events
 * @ioc: per adapter object
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
static u8
_base_async_event(struct MPT3SAS_ADAPTER *ioc, u8 msix_index, u32 reply)
{
        Mpi2EventNotificationReply_t *mpi_reply;
        Mpi2EventAckRequest_t *ack_request;
        u16 smid;
        struct _event_ack_list *delayed_event_ack;

        mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (!mpi_reply)
                return 1;
        if (mpi_reply->Function != MPI2_FUNCTION_EVENT_NOTIFICATION)
                return 1;

        _base_display_event_data(ioc, mpi_reply);

        if (!(mpi_reply->AckRequired & MPI2_EVENT_NOTIFICATION_ACK_REQUIRED))
                goto out;
        smid = mpt3sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                delayed_event_ack = kzalloc(sizeof(*delayed_event_ack),
                                        GFP_ATOMIC);
                if (!delayed_event_ack)
                        goto out;
                INIT_LIST_HEAD(&delayed_event_ack->list);
                delayed_event_ack->Event = mpi_reply->Event;
                delayed_event_ack->EventContext = mpi_reply->EventContext;
                list_add_tail(&delayed_event_ack->list,
                                &ioc->delayed_event_ack_list);
                dewtprintk(ioc, pr_info(MPT3SAS_FMT
                                "DELAYED: EVENT ACK: event (0x%04x)\n",
                                ioc->name, le16_to_cpu(mpi_reply->Event)));
                goto out;
        }

        ack_request = mpt3sas_base_get_msg_frame(ioc, smid);
        memset(ack_request, 0, sizeof(Mpi2EventAckRequest_t));
        ack_request->Function = MPI2_FUNCTION_EVENT_ACK;
        ack_request->Event = mpi_reply->Event;
        ack_request->EventContext = mpi_reply->EventContext;
        ack_request->VF_ID = 0;  /* TODO */
        ack_request->VP_ID = 0;
        mpt3sas_base_put_smid_default(ioc, smid);

 out:

        /* scsih callback handler */
        mpt3sas_scsih_event_callback(ioc, msix_index, reply);

        /* ctl callback handler */
        mpt3sas_ctl_event_callback(ioc, msix_index, reply);

        return 1;
}

static struct scsiio_tracker *
_get_st_from_smid(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        struct scsi_cmnd *cmd;

        if (WARN_ON(!smid) ||
            WARN_ON(smid >= ioc->hi_priority_smid))
                return NULL;

        cmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
        if (cmd)
                return scsi_cmd_priv(cmd);

        return NULL;
}

/**
 * _base_get_cb_idx - obtain the callback index
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return callback index.
 */
static u8
_base_get_cb_idx(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        int i;
        u16 ctl_smid = ioc->scsiio_depth - INTERNAL_SCSIIO_CMDS_COUNT + 1;
        u8 cb_idx = 0xFF;

        if (smid < ioc->hi_priority_smid) {
                struct scsiio_tracker *st;

                if (smid < ctl_smid) {
                        st = _get_st_from_smid(ioc, smid);
                        if (st)
                                cb_idx = st->cb_idx;
                } else if (smid == ctl_smid)
                        cb_idx = ioc->ctl_cb_idx;
        } else if (smid < ioc->internal_smid) {
                i = smid - ioc->hi_priority_smid;
                cb_idx = ioc->hpr_lookup[i].cb_idx;
        } else if (smid <= ioc->hba_queue_depth) {
                i = smid - ioc->internal_smid;
                cb_idx = ioc->internal_lookup[i].cb_idx;
        }
        return cb_idx;
}

/**
 * _base_mask_interrupts - disable interrupts
 * @ioc: per adapter object
 *
 * Disabling ResetIRQ, Reply and Doorbell Interrupts
 *
 * Return nothing.
 */
static void
_base_mask_interrupts(struct MPT3SAS_ADAPTER *ioc)
{
        u32 him_register;

        ioc->mask_interrupts = 1;
        him_register = readl(&ioc->chip->HostInterruptMask);
        him_register |= MPI2_HIM_DIM + MPI2_HIM_RIM + MPI2_HIM_RESET_IRQ_MASK;
        writel(him_register, &ioc->chip->HostInterruptMask);
        readl(&ioc->chip->HostInterruptMask);
}

/**
 * _base_unmask_interrupts - enable interrupts
 * @ioc: per adapter object
 *
 * Enabling only Reply Interrupts
 *
 * Return nothing.
 */
static void
_base_unmask_interrupts(struct MPT3SAS_ADAPTER *ioc)
{
        u32 him_register;

        him_register = readl(&ioc->chip->HostInterruptMask);
        him_register &= ~MPI2_HIM_RIM;
        writel(him_register, &ioc->chip->HostInterruptMask);
        ioc->mask_interrupts = 0;
}

union reply_descriptor {
        u64 word;
        struct {
                u32 low;
                u32 high;
        } u;
};

/**
 * _base_interrupt - MPT adapter (IOC) specific interrupt handler.
 * @irq: irq number (not used)
 * @bus_id: bus identifier cookie == pointer to MPT_ADAPTER structure
 * @r: pt_regs pointer (not used)
 *
 * Return IRQ_HANDLE if processed, else IRQ_NONE.
 */
static irqreturn_t
_base_interrupt(int irq, void *bus_id)
{
        struct adapter_reply_queue *reply_q = bus_id;
        union reply_descriptor rd;
        u32 completed_cmds;
        u8 request_desript_type;
        u16 smid;
        u8 cb_idx;
        u32 reply;
        u8 msix_index = reply_q->msix_index;
        struct MPT3SAS_ADAPTER *ioc = reply_q->ioc;
        Mpi2ReplyDescriptorsUnion_t *rpf;
        u8 rc;

        if (ioc->mask_interrupts)
                return IRQ_NONE;

        if (!atomic_add_unless(&reply_q->busy, 1, 1))
                return IRQ_NONE;

        rpf = &reply_q->reply_post_free[reply_q->reply_post_host_index];
        request_desript_type = rpf->Default.ReplyFlags
             & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;
        if (request_desript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED) {
                atomic_dec(&reply_q->busy);
                return IRQ_NONE;
        }

        completed_cmds = 0;
        cb_idx = 0xFF;
        do {
                rd.word = le64_to_cpu(rpf->Words);
                if (rd.u.low == UINT_MAX || rd.u.high == UINT_MAX)
                        goto out;
                reply = 0;
                smid = le16_to_cpu(rpf->Default.DescriptorTypeDependent1);
                if (request_desript_type ==
                    MPI25_RPY_DESCRIPT_FLAGS_FAST_PATH_SCSI_IO_SUCCESS ||
                    request_desript_type ==
                    MPI2_RPY_DESCRIPT_FLAGS_SCSI_IO_SUCCESS ||
                    request_desript_type ==
                    MPI26_RPY_DESCRIPT_FLAGS_PCIE_ENCAPSULATED_SUCCESS) {
                        cb_idx = _base_get_cb_idx(ioc, smid);
                        if ((likely(cb_idx < MPT_MAX_CALLBACKS)) &&
                            (likely(mpt_callbacks[cb_idx] != NULL))) {
                                rc = mpt_callbacks[cb_idx](ioc, smid,
                                    msix_index, 0);
                                if (rc)
                                        mpt3sas_base_free_smid(ioc, smid);
                        }
                } else if (request_desript_type ==
                    MPI2_RPY_DESCRIPT_FLAGS_ADDRESS_REPLY) {
                        reply = le32_to_cpu(
                            rpf->AddressReply.ReplyFrameAddress);
                        if (reply > ioc->reply_dma_max_address ||
                            reply < ioc->reply_dma_min_address)
                                reply = 0;
                        if (smid) {
                                cb_idx = _base_get_cb_idx(ioc, smid);
                                if ((likely(cb_idx < MPT_MAX_CALLBACKS)) &&
                                    (likely(mpt_callbacks[cb_idx] != NULL))) {
                                        rc = mpt_callbacks[cb_idx](ioc, smid,
                                            msix_index, reply);
                                        if (reply)
                                                _base_display_reply_info(ioc,
                                                    smid, msix_index, reply);
                                        if (rc)
                                                mpt3sas_base_free_smid(ioc,
                                                    smid);
                                }
                        } else {
                                _base_async_event(ioc, msix_index, reply);
                        }

                        /* reply free queue handling */
                        if (reply) {
                                ioc->reply_free_host_index =
                                    (ioc->reply_free_host_index ==
                                    (ioc->reply_free_queue_depth - 1)) ?
                                    0 : ioc->reply_free_host_index + 1;
                                ioc->reply_free[ioc->reply_free_host_index] =
                                    cpu_to_le32(reply);
                                if (ioc->is_mcpu_endpoint)
                                        _base_clone_reply_to_sys_mem(ioc,
                                                cpu_to_le32(reply),
                                                ioc->reply_free_host_index);
                                writel(ioc->reply_free_host_index,
                                    &ioc->chip->ReplyFreeHostIndex);
                        }
                }

                rpf->Words = cpu_to_le64(ULLONG_MAX);
                reply_q->reply_post_host_index =
                    (reply_q->reply_post_host_index ==
                    (ioc->reply_post_queue_depth - 1)) ? 0 :
                    reply_q->reply_post_host_index + 1;
                request_desript_type =
                    reply_q->reply_post_free[reply_q->reply_post_host_index].
                    Default.ReplyFlags & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK;
                completed_cmds++;
                /* Update the reply post host index after continuously
                 * processing the threshold number of Reply Descriptors.
                 * So that FW can find enough entries to post the Reply
                 * Descriptors in the reply descriptor post queue.
                 */
                if (completed_cmds > ioc->hba_queue_depth/3) {
                        if (ioc->combined_reply_queue) {
                                writel(reply_q->reply_post_host_index |
                                                ((msix_index  & 7) <<
                                                 MPI2_RPHI_MSIX_INDEX_SHIFT),
                                    ioc->replyPostRegisterIndex[msix_index/8]);
                        } else {
                                writel(reply_q->reply_post_host_index |
                                                (msix_index <<
                                                 MPI2_RPHI_MSIX_INDEX_SHIFT),
                                                &ioc->chip->ReplyPostHostIndex);
                        }
                        completed_cmds = 1;
                }
                if (request_desript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED)
                        goto out;
                if (!reply_q->reply_post_host_index)
                        rpf = reply_q->reply_post_free;
                else
                        rpf++;
        } while (1);

 out:

        if (!completed_cmds) {
                atomic_dec(&reply_q->busy);
                return IRQ_NONE;
        }

        if (ioc->is_warpdrive) {
                writel(reply_q->reply_post_host_index,
                ioc->reply_post_host_index[msix_index]);
                atomic_dec(&reply_q->busy);
                return IRQ_HANDLED;
        }

        /* Update Reply Post Host Index.
         * For those HBA's which support combined reply queue feature
         * 1. Get the correct Supplemental Reply Post Host Index Register.
         *    i.e. (msix_index / 8)th entry from Supplemental Reply Post Host
         *    Index Register address bank i.e replyPostRegisterIndex[],
         * 2. Then update this register with new reply host index value
         *    in ReplyPostIndex field and the MSIxIndex field with
         *    msix_index value reduced to a value between 0 and 7,
         *    using a modulo 8 operation. Since each Supplemental Reply Post
         *    Host Index Register supports 8 MSI-X vectors.
         *
         * For other HBA's just update the Reply Post Host Index register with
         * new reply host index value in ReplyPostIndex Field and msix_index
         * value in MSIxIndex field.
         */
        if (ioc->combined_reply_queue)
                writel(reply_q->reply_post_host_index | ((msix_index  & 7) <<
                        MPI2_RPHI_MSIX_INDEX_SHIFT),
                        ioc->replyPostRegisterIndex[msix_index/8]);
        else
                writel(reply_q->reply_post_host_index | (msix_index <<
                        MPI2_RPHI_MSIX_INDEX_SHIFT),
                        &ioc->chip->ReplyPostHostIndex);
        atomic_dec(&reply_q->busy);
        return IRQ_HANDLED;
}

/**
 * _base_is_controller_msix_enabled - is controller support muli-reply queues
 * @ioc: per adapter object
 *
 */
static inline int
_base_is_controller_msix_enabled(struct MPT3SAS_ADAPTER *ioc)
{
        return (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_MSI_X_INDEX) && ioc->msix_enable;
}

/**
 * mpt3sas_base_sync_reply_irqs - flush pending MSIX interrupts
 * @ioc: per adapter object
 * Context: non ISR conext
 *
 * Called when a Task Management request has completed.
 *
 * Return nothing.
 */
void
mpt3sas_base_sync_reply_irqs(struct MPT3SAS_ADAPTER *ioc)
{
        struct adapter_reply_queue *reply_q;

        /* If MSIX capability is turned off
         * then multi-queues are not enabled
         */
        if (!_base_is_controller_msix_enabled(ioc))
                return;

        list_for_each_entry(reply_q, &ioc->reply_queue_list, list) {
                if (ioc->shost_recovery || ioc->remove_host ||
                                ioc->pci_error_recovery)
                        return;
                /* TMs are on msix_index == 0 */
                if (reply_q->msix_index == 0)
                        continue;
                synchronize_irq(pci_irq_vector(ioc->pdev, reply_q->msix_index));
        }
}

/**
 * mpt3sas_base_release_callback_handler - clear interrupt callback handler
 * @cb_idx: callback index
 *
 * Return nothing.
 */
void
mpt3sas_base_release_callback_handler(u8 cb_idx)
{
        mpt_callbacks[cb_idx] = NULL;
}

/**
 * mpt3sas_base_register_callback_handler - obtain index for the interrupt callback handler
 * @cb_func: callback function
 *
 * Returns cb_func.
 */
u8
mpt3sas_base_register_callback_handler(MPT_CALLBACK cb_func)
{
        u8 cb_idx;

        for (cb_idx = MPT_MAX_CALLBACKS-1; cb_idx; cb_idx--)
                if (mpt_callbacks[cb_idx] == NULL)
                        break;

        mpt_callbacks[cb_idx] = cb_func;
        return cb_idx;
}

/**
 * mpt3sas_base_initialize_callback_handler - initialize the interrupt callback handler
 *
 * Return nothing.
 */
void
mpt3sas_base_initialize_callback_handler(void)
{
        u8 cb_idx;

        for (cb_idx = 0; cb_idx < MPT_MAX_CALLBACKS; cb_idx++)
                mpt3sas_base_release_callback_handler(cb_idx);
}


/**
 * _base_build_zero_len_sge - build zero length sg entry
 * @ioc: per adapter object
 * @paddr: virtual address for SGE
 *
 * Create a zero length scatter gather entry to insure the IOCs hardware has
 * something to use if the target device goes brain dead and tries
 * to send data even when none is asked for.
 *
 * Return nothing.
 */
static void
_base_build_zero_len_sge(struct MPT3SAS_ADAPTER *ioc, void *paddr)
{
        u32 flags_length = (u32)((MPI2_SGE_FLAGS_LAST_ELEMENT |
            MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_END_OF_LIST |
            MPI2_SGE_FLAGS_SIMPLE_ELEMENT) <<
            MPI2_SGE_FLAGS_SHIFT);
        ioc->base_add_sg_single(paddr, flags_length, -1);
}

/**
 * _base_add_sg_single_32 - Place a simple 32 bit SGE at address pAddr.
 * @paddr: virtual address for SGE
 * @flags_length: SGE flags and data transfer length
 * @dma_addr: Physical address
 *
 * Return nothing.
 */
static void
_base_add_sg_single_32(void *paddr, u32 flags_length, dma_addr_t dma_addr)
{
        Mpi2SGESimple32_t *sgel = paddr;

        flags_length |= (MPI2_SGE_FLAGS_32_BIT_ADDRESSING |
            MPI2_SGE_FLAGS_SYSTEM_ADDRESS) << MPI2_SGE_FLAGS_SHIFT;
        sgel->FlagsLength = cpu_to_le32(flags_length);
        sgel->Address = cpu_to_le32(dma_addr);
}


/**
 * _base_add_sg_single_64 - Place a simple 64 bit SGE at address pAddr.
 * @paddr: virtual address for SGE
 * @flags_length: SGE flags and data transfer length
 * @dma_addr: Physical address
 *
 * Return nothing.
 */
static void
_base_add_sg_single_64(void *paddr, u32 flags_length, dma_addr_t dma_addr)
{
        Mpi2SGESimple64_t *sgel = paddr;

        flags_length |= (MPI2_SGE_FLAGS_64_BIT_ADDRESSING |
            MPI2_SGE_FLAGS_SYSTEM_ADDRESS) << MPI2_SGE_FLAGS_SHIFT;
        sgel->FlagsLength = cpu_to_le32(flags_length);
        sgel->Address = cpu_to_le64(dma_addr);
}

/**
 * _base_get_chain_buffer_tracker - obtain chain tracker
 * @ioc: per adapter object
 * @scmd: SCSI commands of the IO request
 *
 * Returns chain tracker(from ioc->free_chain_list)
 */
static struct chain_tracker *
_base_get_chain_buffer_tracker(struct MPT3SAS_ADAPTER *ioc,
                               struct scsi_cmnd *scmd)
{
        struct chain_tracker *chain_req;
        struct scsiio_tracker *st = scsi_cmd_priv(scmd);
        unsigned long flags;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (list_empty(&ioc->free_chain_list)) {
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                dfailprintk(ioc, pr_warn(MPT3SAS_FMT
                        "chain buffers not available\n", ioc->name));
                return NULL;
        }
        chain_req = list_entry(ioc->free_chain_list.next,
            struct chain_tracker, tracker_list);
        list_del_init(&chain_req->tracker_list);
        list_add_tail(&chain_req->tracker_list, &st->chain_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        return chain_req;
}


/**
 * _base_build_sg - build generic sg
 * @ioc: per adapter object
 * @psge: virtual address for SGE
 * @data_out_dma: physical address for WRITES
 * @data_out_sz: data xfer size for WRITES
 * @data_in_dma: physical address for READS
 * @data_in_sz: data xfer size for READS
 *
 * Return nothing.
 */
static void
_base_build_sg(struct MPT3SAS_ADAPTER *ioc, void *psge,
        dma_addr_t data_out_dma, size_t data_out_sz, dma_addr_t data_in_dma,
        size_t data_in_sz)
{
        u32 sgl_flags;

        if (!data_out_sz && !data_in_sz) {
                _base_build_zero_len_sge(ioc, psge);
                return;
        }

        if (data_out_sz && data_in_sz) {
                /* WRITE sgel first */
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_HOST_TO_IOC);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_out_sz, data_out_dma);

                /* incr sgel */
                psge += ioc->sge_size;

                /* READ sgel last */
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
                    MPI2_SGE_FLAGS_END_OF_LIST);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_in_sz, data_in_dma);
        } else if (data_out_sz) /* WRITE */ {
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
                    MPI2_SGE_FLAGS_END_OF_LIST | MPI2_SGE_FLAGS_HOST_TO_IOC);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_out_sz, data_out_dma);
        } else if (data_in_sz) /* READ */ {
                sgl_flags = (MPI2_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_SGE_FLAGS_LAST_ELEMENT | MPI2_SGE_FLAGS_END_OF_BUFFER |
                    MPI2_SGE_FLAGS_END_OF_LIST);
                sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;
                ioc->base_add_sg_single(psge, sgl_flags |
                    data_in_sz, data_in_dma);
        }
}

/* IEEE format sgls */

/**
 * _base_build_nvme_prp - This function is called for NVMe end devices to build
 * a native SGL (NVMe PRP). The native SGL is built starting in the first PRP
 * entry of the NVMe message (PRP1).  If the data buffer is small enough to be
 * described entirely using PRP1, then PRP2 is not used.  If needed, PRP2 is
 * used to describe a larger data buffer.  If the data buffer is too large to
 * describe using the two PRP entriess inside the NVMe message, then PRP1
 * describes the first data memory segment, and PRP2 contains a pointer to a PRP
 * list located elsewhere in memory to describe the remaining data memory
 * segments.  The PRP list will be contiguous.

 * The native SGL for NVMe devices is a Physical Region Page (PRP).  A PRP
 * consists of a list of PRP entries to describe a number of noncontigous
 * physical memory segments as a single memory buffer, just as a SGL does.  Note
 * however, that this function is only used by the IOCTL call, so the memory
 * given will be guaranteed to be contiguous.  There is no need to translate
 * non-contiguous SGL into a PRP in this case.  All PRPs will describe
 * contiguous space that is one page size each.
 *
 * Each NVMe message contains two PRP entries.  The first (PRP1) either contains
 * a PRP list pointer or a PRP element, depending upon the command.  PRP2
 * contains the second PRP element if the memory being described fits within 2
 * PRP entries, or a PRP list pointer if the PRP spans more than two entries.
 *
 * A PRP list pointer contains the address of a PRP list, structured as a linear
 * array of PRP entries.  Each PRP entry in this list describes a segment of
 * physical memory.
 *
 * Each 64-bit PRP entry comprises an address and an offset field.  The address
 * always points at the beginning of a 4KB physical memory page, and the offset
 * describes where within that 4KB page the memory segment begins.  Only the
 * first element in a PRP list may contain a non-zero offest, implying that all
 * memory segments following the first begin at the start of a 4KB page.
 *
 * Each PRP element normally describes 4KB of physical memory, with exceptions
 * for the first and last elements in the list.  If the memory being described
 * by the list begins at a non-zero offset within the first 4KB page, then the
 * first PRP element will contain a non-zero offset indicating where the region
 * begins within the 4KB page.  The last memory segment may end before the end
 * of the 4KB segment, depending upon the overall size of the memory being
 * described by the PRP list.
 *
 * Since PRP entries lack any indication of size, the overall data buffer length
 * is used to determine where the end of the data memory buffer is located, and
 * how many PRP entries are required to describe it.
 *
 * @ioc: per adapter object
 * @smid: system request message index for getting asscociated SGL
 * @nvme_encap_request: the NVMe request msg frame pointer
 * @data_out_dma: physical address for WRITES
 * @data_out_sz: data xfer size for WRITES
 * @data_in_dma: physical address for READS
 * @data_in_sz: data xfer size for READS
 *
 * Returns nothing.
 */
static void
_base_build_nvme_prp(struct MPT3SAS_ADAPTER *ioc, u16 smid,
        Mpi26NVMeEncapsulatedRequest_t *nvme_encap_request,
        dma_addr_t data_out_dma, size_t data_out_sz, dma_addr_t data_in_dma,
        size_t data_in_sz)
{
        int             prp_size = NVME_PRP_SIZE;
        __le64          *prp_entry, *prp1_entry, *prp2_entry;
        __le64          *prp_page;
        dma_addr_t      prp_entry_dma, prp_page_dma, dma_addr;
        u32             offset, entry_len;
        u32             page_mask_result, page_mask;
        size_t          length;

        /*
         * Not all commands require a data transfer. If no data, just return
         * without constructing any PRP.
         */
        if (!data_in_sz && !data_out_sz)
                return;
        /*
         * Set pointers to PRP1 and PRP2, which are in the NVMe command.
         * PRP1 is located at a 24 byte offset from the start of the NVMe
         * command.  Then set the current PRP entry pointer to PRP1.
         */
        prp1_entry = (__le64 *)(nvme_encap_request->NVMe_Command +
            NVME_CMD_PRP1_OFFSET);
        prp2_entry = (__le64 *)(nvme_encap_request->NVMe_Command +
            NVME_CMD_PRP2_OFFSET);
        prp_entry = prp1_entry;
        /*
         * For the PRP entries, use the specially allocated buffer of
         * contiguous memory.
         */
        prp_page = (__le64 *)mpt3sas_base_get_pcie_sgl(ioc, smid);
        prp_page_dma = mpt3sas_base_get_pcie_sgl_dma(ioc, smid);

        /*
         * Check if we are within 1 entry of a page boundary we don't
         * want our first entry to be a PRP List entry.
         */
        page_mask = ioc->page_size - 1;
        page_mask_result = (uintptr_t)((u8 *)prp_page + prp_size) & page_mask;
        if (!page_mask_result) {
                /* Bump up to next page boundary. */
                prp_page = (__le64 *)((u8 *)prp_page + prp_size);
                prp_page_dma = prp_page_dma + prp_size;
        }

        /*
         * Set PRP physical pointer, which initially points to the current PRP
         * DMA memory page.
         */
        prp_entry_dma = prp_page_dma;

        /* Get physical address and length of the data buffer. */
        if (data_in_sz) {
                dma_addr = data_in_dma;
                length = data_in_sz;
        } else {
                dma_addr = data_out_dma;
                length = data_out_sz;
        }

        /* Loop while the length is not zero. */
        while (length) {
                /*
                 * Check if we need to put a list pointer here if we are at
                 * page boundary - prp_size (8 bytes).
                 */
                page_mask_result = (prp_entry_dma + prp_size) & page_mask;
                if (!page_mask_result) {
                        /*
                         * This is the last entry in a PRP List, so we need to
                         * put a PRP list pointer here.  What this does is:
                         *   - bump the current memory pointer to the next
                         *     address, which will be the next full page.
                         *   - set the PRP Entry to point to that page.  This
                         *     is now the PRP List pointer.
                         *   - bump the PRP Entry pointer the start of the
                         *     next page.  Since all of this PRP memory is
                         *     contiguous, no need to get a new page - it's
                         *     just the next address.
                         */
                        prp_entry_dma++;
                        *prp_entry = cpu_to_le64(prp_entry_dma);
                        prp_entry++;
                }

                /* Need to handle if entry will be part of a page. */
                offset = dma_addr & page_mask;
                entry_len = ioc->page_size - offset;

                if (prp_entry == prp1_entry) {
                        /*
                         * Must fill in the first PRP pointer (PRP1) before
                         * moving on.
                         */
                        *prp1_entry = cpu_to_le64(dma_addr);

                        /*
                         * Now point to the second PRP entry within the
                         * command (PRP2).
                         */
                        prp_entry = prp2_entry;
                } else if (prp_entry == prp2_entry) {
                        /*
                         * Should the PRP2 entry be a PRP List pointer or just
                         * a regular PRP pointer?  If there is more than one
                         * more page of data, must use a PRP List pointer.
                         */
                        if (length > ioc->page_size) {
                                /*
                                 * PRP2 will contain a PRP List pointer because
                                 * more PRP's are needed with this command. The
                                 * list will start at the beginning of the
                                 * contiguous buffer.
                                 */
                                *prp2_entry = cpu_to_le64(prp_entry_dma);

                                /*
                                 * The next PRP Entry will be the start of the
                                 * first PRP List.
                                 */
                                prp_entry = prp_page;
                        } else {
                                /*
                                 * After this, the PRP Entries are complete.
                                 * This command uses 2 PRP's and no PRP list.
                                 */
                                *prp2_entry = cpu_to_le64(dma_addr);
                        }
                } else {
                        /*
                         * Put entry in list and bump the addresses.
                         *
                         * After PRP1 and PRP2 are filled in, this will fill in
                         * all remaining PRP entries in a PRP List, one per
                         * each time through the loop.
                         */
                        *prp_entry = cpu_to_le64(dma_addr);
                        prp_entry++;
                        prp_entry_dma++;
                }

                /*
                 * Bump the phys address of the command's data buffer by the
                 * entry_len.
                 */
                dma_addr += entry_len;

                /* Decrement length accounting for last partial page. */
                if (entry_len > length)
                        length = 0;
                else
                        length -= entry_len;
        }
}

/**
 * base_make_prp_nvme -
 * Prepare PRPs(Physical Region Page)- SGLs specific to NVMe drives only
 *
 * @ioc:                per adapter object
 * @scmd:               SCSI command from the mid-layer
 * @mpi_request:        mpi request
 * @smid:               msg Index
 * @sge_count:          scatter gather element count.
 *
 * Returns:             true: PRPs are built
 *                      false: IEEE SGLs needs to be built
 */
static void
base_make_prp_nvme(struct MPT3SAS_ADAPTER *ioc,
                struct scsi_cmnd *scmd,
                Mpi25SCSIIORequest_t *mpi_request,
                u16 smid, int sge_count)
{
        int sge_len, num_prp_in_chain = 0;
        Mpi25IeeeSgeChain64_t *main_chain_element, *ptr_first_sgl;
        __le64 *curr_buff;
        dma_addr_t msg_dma, sge_addr, offset;
        u32 page_mask, page_mask_result;
        struct scatterlist *sg_scmd;
        u32 first_prp_len;
        int data_len = scsi_bufflen(scmd);
        u32 nvme_pg_size;

        nvme_pg_size = max_t(u32, ioc->page_size, NVME_PRP_PAGE_SIZE);
        /*
         * Nvme has a very convoluted prp format.  One prp is required
         * for each page or partial page. Driver need to split up OS sg_list
         * entries if it is longer than one page or cross a page
         * boundary.  Driver also have to insert a PRP list pointer entry as
         * the last entry in each physical page of the PRP list.
         *
         * NOTE: The first PRP "entry" is actually placed in the first
         * SGL entry in the main message as IEEE 64 format.  The 2nd
         * entry in the main message is the chain element, and the rest
         * of the PRP entries are built in the contiguous pcie buffer.
         */
        page_mask = nvme_pg_size - 1;

        /*
         * Native SGL is needed.
         * Put a chain element in main message frame that points to the first
         * chain buffer.
         *
         * NOTE:  The ChainOffset field must be 0 when using a chain pointer to
         *        a native SGL.
         */

        /* Set main message chain element pointer */
        main_chain_element = (pMpi25IeeeSgeChain64_t)&mpi_request->SGL;
        /*
         * For NVMe the chain element needs to be the 2nd SG entry in the main
         * message.
         */
        main_chain_element = (Mpi25IeeeSgeChain64_t *)
                ((u8 *)main_chain_element + sizeof(MPI25_IEEE_SGE_CHAIN64));

        /*
         * For the PRP entries, use the specially allocated buffer of
         * contiguous memory.  Normal chain buffers can't be used
         * because each chain buffer would need to be the size of an OS
         * page (4k).
         */
        curr_buff = mpt3sas_base_get_pcie_sgl(ioc, smid);
        msg_dma = mpt3sas_base_get_pcie_sgl_dma(ioc, smid);

        main_chain_element->Address = cpu_to_le64(msg_dma);
        main_chain_element->NextChainOffset = 0;
        main_chain_element->Flags = MPI2_IEEE_SGE_FLAGS_CHAIN_ELEMENT |
                        MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR |
                        MPI26_IEEE_SGE_FLAGS_NSF_NVME_PRP;

        /* Build first prp, sge need not to be page aligned*/
        ptr_first_sgl = (pMpi25IeeeSgeChain64_t)&mpi_request->SGL;
        sg_scmd = scsi_sglist(scmd);
        sge_addr = sg_dma_address(sg_scmd);
        sge_len = sg_dma_len(sg_scmd);

        offset = sge_addr & page_mask;
        first_prp_len = nvme_pg_size - offset;

        ptr_first_sgl->Address = cpu_to_le64(sge_addr);
        ptr_first_sgl->Length = cpu_to_le32(first_prp_len);

        data_len -= first_prp_len;

        if (sge_len > first_prp_len) {
                sge_addr += first_prp_len;
                sge_len -= first_prp_len;
        } else if (data_len && (sge_len == first_prp_len)) {
                sg_scmd = sg_next(sg_scmd);
                sge_addr = sg_dma_address(sg_scmd);
                sge_len = sg_dma_len(sg_scmd);
        }

        for (;;) {
                offset = sge_addr & page_mask;

                /* Put PRP pointer due to page boundary*/
                page_mask_result = (uintptr_t)(curr_buff + 1) & page_mask;
                if (unlikely(!page_mask_result)) {
                        scmd_printk(KERN_NOTICE,
                                scmd, "page boundary curr_buff: 0x%p\n",
                                curr_buff);
                        msg_dma += 8;
                        *curr_buff = cpu_to_le64(msg_dma);
                        curr_buff++;
                        num_prp_in_chain++;
                }

                *curr_buff = cpu_to_le64(sge_addr);
                curr_buff++;
                msg_dma += 8;
                num_prp_in_chain++;

                sge_addr += nvme_pg_size;
                sge_len -= nvme_pg_size;
                data_len -= nvme_pg_size;

                if (data_len <= 0)
                        break;

                if (sge_len > 0)
                        continue;

                sg_scmd = sg_next(sg_scmd);
                sge_addr = sg_dma_address(sg_scmd);
                sge_len = sg_dma_len(sg_scmd);
        }

        main_chain_element->Length =
                cpu_to_le32(num_prp_in_chain * sizeof(u64));
        return;
}

static bool
base_is_prp_possible(struct MPT3SAS_ADAPTER *ioc,
        struct _pcie_device *pcie_device, struct scsi_cmnd *scmd, int sge_count)
{
        u32 data_length = 0;
        struct scatterlist *sg_scmd;
        bool build_prp = true;

        data_length = scsi_bufflen(scmd);
        sg_scmd = scsi_sglist(scmd);

        /* If Datalenth is <= 16K and number of SGE’s entries are <= 2
         * we built IEEE SGL
         */
        if ((data_length <= NVME_PRP_PAGE_SIZE*4) && (sge_count <= 2))
                build_prp = false;

        return build_prp;
}

/**
 * _base_check_pcie_native_sgl - This function is called for PCIe end devices to
 * determine if the driver needs to build a native SGL.  If so, that native
 * SGL is built in the special contiguous buffers allocated especially for
 * PCIe SGL creation.  If the driver will not build a native SGL, return
 * TRUE and a normal IEEE SGL will be built.  Currently this routine
 * supports NVMe.
 * @ioc: per adapter object
 * @mpi_request: mf request pointer
 * @smid: system request message index
 * @scmd: scsi command
 * @pcie_device: points to the PCIe device's info
 *
 * Returns 0 if native SGL was built, 1 if no SGL was built
 */
static int
_base_check_pcie_native_sgl(struct MPT3SAS_ADAPTER *ioc,
        Mpi25SCSIIORequest_t *mpi_request, u16 smid, struct scsi_cmnd *scmd,
        struct _pcie_device *pcie_device)
{
        struct scatterlist *sg_scmd;
        int sges_left;

        /* Get the SG list pointer and info. */
        sg_scmd = scsi_sglist(scmd);
        sges_left = scsi_dma_map(scmd);
        if (sges_left < 0) {
                sdev_printk(KERN_ERR, scmd->device,
                        "scsi_dma_map failed: request for %d bytes!\n",
                        scsi_bufflen(scmd));
                return 1;
        }

        /* Check if we need to build a native SG list. */
        if (base_is_prp_possible(ioc, pcie_device,
                                scmd, sges_left) == 0) {
                /* We built a native SG list, just return. */
                goto out;
        }

        /*
         * Build native NVMe PRP.
         */
        base_make_prp_nvme(ioc, scmd, mpi_request,
                        smid, sges_left);

        return 0;
out:
        scsi_dma_unmap(scmd);
        return 1;
}

/**
 * _base_add_sg_single_ieee - add sg element for IEEE format
 * @paddr: virtual address for SGE
 * @flags: SGE flags
 * @chain_offset: number of 128 byte elements from start of segment
 * @length: data transfer length
 * @dma_addr: Physical address
 *
 * Return nothing.
 */
static void
_base_add_sg_single_ieee(void *paddr, u8 flags, u8 chain_offset, u32 length,
        dma_addr_t dma_addr)
{
        Mpi25IeeeSgeChain64_t *sgel = paddr;

        sgel->Flags = flags;
        sgel->NextChainOffset = chain_offset;
        sgel->Length = cpu_to_le32(length);
        sgel->Address = cpu_to_le64(dma_addr);
}

/**
 * _base_build_zero_len_sge_ieee - build zero length sg entry for IEEE format
 * @ioc: per adapter object
 * @paddr: virtual address for SGE
 *
 * Create a zero length scatter gather entry to insure the IOCs hardware has
 * something to use if the target device goes brain dead and tries
 * to send data even when none is asked for.
 *
 * Return nothing.
 */
static void
_base_build_zero_len_sge_ieee(struct MPT3SAS_ADAPTER *ioc, void *paddr)
{
        u8 sgl_flags = (MPI2_IEEE_SGE_FLAGS_SIMPLE_ELEMENT |
                MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR |
                MPI25_IEEE_SGE_FLAGS_END_OF_LIST);

        _base_add_sg_single_ieee(paddr, sgl_flags, 0, 0, -1);
}

/**
 * _base_build_sg_scmd - main sg creation routine
 *              pcie_device is unused here!
 * @ioc: per adapter object
 * @scmd: scsi command
 * @smid: system request message index
 * @unused: unused pcie_device pointer
 * Context: none.
 *
 * The main routine that builds scatter gather table from a given
 * scsi request sent via the .queuecommand main handler.
 *
 * Returns 0 success, anything else error
 */
static int
_base_build_sg_scmd(struct MPT3SAS_ADAPTER *ioc,
        struct scsi_cmnd *scmd, u16 smid, struct _pcie_device *unused)
{
        Mpi2SCSIIORequest_t *mpi_request;
        dma_addr_t chain_dma;
        struct scatterlist *sg_scmd;
        void *sg_local, *chain;
        u32 chain_offset;
        u32 chain_length;
        u32 chain_flags;
        int sges_left;
        u32 sges_in_segment;
        u32 sgl_flags;
        u32 sgl_flags_last_element;
        u32 sgl_flags_end_buffer;
        struct chain_tracker *chain_req;

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);

        /* init scatter gather flags */
        sgl_flags = MPI2_SGE_FLAGS_SIMPLE_ELEMENT;
        if (scmd->sc_data_direction == DMA_TO_DEVICE)
                sgl_flags |= MPI2_SGE_FLAGS_HOST_TO_IOC;
        sgl_flags_last_element = (sgl_flags | MPI2_SGE_FLAGS_LAST_ELEMENT)
            << MPI2_SGE_FLAGS_SHIFT;
        sgl_flags_end_buffer = (sgl_flags | MPI2_SGE_FLAGS_LAST_ELEMENT |
            MPI2_SGE_FLAGS_END_OF_BUFFER | MPI2_SGE_FLAGS_END_OF_LIST)
            << MPI2_SGE_FLAGS_SHIFT;
        sgl_flags = sgl_flags << MPI2_SGE_FLAGS_SHIFT;

        sg_scmd = scsi_sglist(scmd);
        sges_left = scsi_dma_map(scmd);
        if (sges_left < 0) {
                sdev_printk(KERN_ERR, scmd->device,
                 "pci_map_sg failed: request for %d bytes!\n",
                 scsi_bufflen(scmd));
                return -ENOMEM;
        }

        sg_local = &mpi_request->SGL;
        sges_in_segment = ioc->max_sges_in_main_message;
        if (sges_left <= sges_in_segment)
                goto fill_in_last_segment;

        mpi_request->ChainOffset = (offsetof(Mpi2SCSIIORequest_t, SGL) +
            (sges_in_segment * ioc->sge_size))/4;

        /* fill in main message segment when there is a chain following */
        while (sges_in_segment) {
                if (sges_in_segment == 1)
                        ioc->base_add_sg_single(sg_local,
                            sgl_flags_last_element | sg_dma_len(sg_scmd),
                            sg_dma_address(sg_scmd));
                else
                        ioc->base_add_sg_single(sg_local, sgl_flags |
                            sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
                sg_scmd = sg_next(sg_scmd);
                sg_local += ioc->sge_size;
                sges_left--;
                sges_in_segment--;
        }

        /* initializing the chain flags and pointers */
        chain_flags = MPI2_SGE_FLAGS_CHAIN_ELEMENT << MPI2_SGE_FLAGS_SHIFT;
        chain_req = _base_get_chain_buffer_tracker(ioc, scmd);
        if (!chain_req)
                return -1;
        chain = chain_req->chain_buffer;
        chain_dma = chain_req->chain_buffer_dma;
        do {
                sges_in_segment = (sges_left <=
                    ioc->max_sges_in_chain_message) ? sges_left :
                    ioc->max_sges_in_chain_message;
                chain_offset = (sges_left == sges_in_segment) ?
                    0 : (sges_in_segment * ioc->sge_size)/4;
                chain_length = sges_in_segment * ioc->sge_size;
                if (chain_offset) {
                        chain_offset = chain_offset <<
                            MPI2_SGE_CHAIN_OFFSET_SHIFT;
                        chain_length += ioc->sge_size;
                }
                ioc->base_add_sg_single(sg_local, chain_flags | chain_offset |
                    chain_length, chain_dma);
                sg_local = chain;
                if (!chain_offset)
                        goto fill_in_last_segment;

                /* fill in chain segments */
                while (sges_in_segment) {
                        if (sges_in_segment == 1)
                                ioc->base_add_sg_single(sg_local,
                                    sgl_flags_last_element |
                                    sg_dma_len(sg_scmd),
                                    sg_dma_address(sg_scmd));
                        else
                                ioc->base_add_sg_single(sg_local, sgl_flags |
                                    sg_dma_len(sg_scmd),
                                    sg_dma_address(sg_scmd));
                        sg_scmd = sg_next(sg_scmd);
                        sg_local += ioc->sge_size;
                        sges_left--;
                        sges_in_segment--;
                }

                chain_req = _base_get_chain_buffer_tracker(ioc, scmd);
                if (!chain_req)
                        return -1;
                chain = chain_req->chain_buffer;
                chain_dma = chain_req->chain_buffer_dma;
        } while (1);


 fill_in_last_segment:

        /* fill the last segment */
        while (sges_left) {
                if (sges_left == 1)
                        ioc->base_add_sg_single(sg_local, sgl_flags_end_buffer |
                            sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
                else
                        ioc->base_add_sg_single(sg_local, sgl_flags |
                            sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
                sg_scmd = sg_next(sg_scmd);
                sg_local += ioc->sge_size;
                sges_left--;
        }

        return 0;
}

/**
 * _base_build_sg_scmd_ieee - main sg creation routine for IEEE format
 * @ioc: per adapter object
 * @scmd: scsi command
 * @smid: system request message index
 * @pcie_device: Pointer to pcie_device. If set, the pcie native sgl will be
 * constructed on need.
 * Context: none.
 *
 * The main routine that builds scatter gather table from a given
 * scsi request sent via the .queuecommand main handler.
 *
 * Returns 0 success, anything else error
 */
static int
_base_build_sg_scmd_ieee(struct MPT3SAS_ADAPTER *ioc,
        struct scsi_cmnd *scmd, u16 smid, struct _pcie_device *pcie_device)
{
        Mpi25SCSIIORequest_t *mpi_request;
        dma_addr_t chain_dma;
        struct scatterlist *sg_scmd;
        void *sg_local, *chain;
        u32 chain_offset;
        u32 chain_length;
        int sges_left;
        u32 sges_in_segment;
        u8 simple_sgl_flags;
        u8 simple_sgl_flags_last;
        u8 chain_sgl_flags;
        struct chain_tracker *chain_req;

        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);

        /* init scatter gather flags */
        simple_sgl_flags = MPI2_IEEE_SGE_FLAGS_SIMPLE_ELEMENT |
            MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR;
        simple_sgl_flags_last = simple_sgl_flags |
            MPI25_IEEE_SGE_FLAGS_END_OF_LIST;
        chain_sgl_flags = MPI2_IEEE_SGE_FLAGS_CHAIN_ELEMENT |
            MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR;

        /* Check if we need to build a native SG list. */
        if ((pcie_device) && (_base_check_pcie_native_sgl(ioc, mpi_request,
                        smid, scmd, pcie_device) == 0)) {
                /* We built a native SG list, just return. */
                return 0;
        }

        sg_scmd = scsi_sglist(scmd);
        sges_left = scsi_dma_map(scmd);
        if (sges_left < 0) {
                sdev_printk(KERN_ERR, scmd->device,
                        "pci_map_sg failed: request for %d bytes!\n",
                        scsi_bufflen(scmd));
                return -ENOMEM;
        }

        sg_local = &mpi_request->SGL;
        sges_in_segment = (ioc->request_sz -
                   offsetof(Mpi25SCSIIORequest_t, SGL))/ioc->sge_size_ieee;
        if (sges_left <= sges_in_segment)
                goto fill_in_last_segment;

        mpi_request->ChainOffset = (sges_in_segment - 1 /* chain element */) +
            (offsetof(Mpi25SCSIIORequest_t, SGL)/ioc->sge_size_ieee);

        /* fill in main message segment when there is a chain following */
        while (sges_in_segment > 1) {
                _base_add_sg_single_ieee(sg_local, simple_sgl_flags, 0,
                    sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
                sg_scmd = sg_next(sg_scmd);
                sg_local += ioc->sge_size_ieee;
                sges_left--;
                sges_in_segment--;
        }

        /* initializing the pointers */
        chain_req = _base_get_chain_buffer_tracker(ioc, scmd);
        if (!chain_req)
                return -1;
        chain = chain_req->chain_buffer;
        chain_dma = chain_req->chain_buffer_dma;
        do {
                sges_in_segment = (sges_left <=
                    ioc->max_sges_in_chain_message) ? sges_left :
                    ioc->max_sges_in_chain_message;
                chain_offset = (sges_left == sges_in_segment) ?
                    0 : sges_in_segment;
                chain_length = sges_in_segment * ioc->sge_size_ieee;
                if (chain_offset)
                        chain_length += ioc->sge_size_ieee;
                _base_add_sg_single_ieee(sg_local, chain_sgl_flags,
                    chain_offset, chain_length, chain_dma);

                sg_local = chain;
                if (!chain_offset)
                        goto fill_in_last_segment;

                /* fill in chain segments */
                while (sges_in_segment) {
                        _base_add_sg_single_ieee(sg_local, simple_sgl_flags, 0,
                            sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
                        sg_scmd = sg_next(sg_scmd);
                        sg_local += ioc->sge_size_ieee;
                        sges_left--;
                        sges_in_segment--;
                }

                chain_req = _base_get_chain_buffer_tracker(ioc, scmd);
                if (!chain_req)
                        return -1;
                chain = chain_req->chain_buffer;
                chain_dma = chain_req->chain_buffer_dma;
        } while (1);


 fill_in_last_segment:

        /* fill the last segment */
        while (sges_left > 0) {
                if (sges_left == 1)
                        _base_add_sg_single_ieee(sg_local,
                            simple_sgl_flags_last, 0, sg_dma_len(sg_scmd),
                            sg_dma_address(sg_scmd));
                else
                        _base_add_sg_single_ieee(sg_local, simple_sgl_flags, 0,
                            sg_dma_len(sg_scmd), sg_dma_address(sg_scmd));
                sg_scmd = sg_next(sg_scmd);
                sg_local += ioc->sge_size_ieee;
                sges_left--;
        }

        return 0;
}

/**
 * _base_build_sg_ieee - build generic sg for IEEE format
 * @ioc: per adapter object
 * @psge: virtual address for SGE
 * @data_out_dma: physical address for WRITES
 * @data_out_sz: data xfer size for WRITES
 * @data_in_dma: physical address for READS
 * @data_in_sz: data xfer size for READS
 *
 * Return nothing.
 */
static void
_base_build_sg_ieee(struct MPT3SAS_ADAPTER *ioc, void *psge,
        dma_addr_t data_out_dma, size_t data_out_sz, dma_addr_t data_in_dma,
        size_t data_in_sz)
{
        u8 sgl_flags;

        if (!data_out_sz && !data_in_sz) {
                _base_build_zero_len_sge_ieee(ioc, psge);
                return;
        }

        if (data_out_sz && data_in_sz) {
                /* WRITE sgel first */
                sgl_flags = MPI2_IEEE_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR;
                _base_add_sg_single_ieee(psge, sgl_flags, 0, data_out_sz,
                    data_out_dma);

                /* incr sgel */
                psge += ioc->sge_size_ieee;

                /* READ sgel last */
                sgl_flags |= MPI25_IEEE_SGE_FLAGS_END_OF_LIST;
                _base_add_sg_single_ieee(psge, sgl_flags, 0, data_in_sz,
                    data_in_dma);
        } else if (data_out_sz) /* WRITE */ {
                sgl_flags = MPI2_IEEE_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI25_IEEE_SGE_FLAGS_END_OF_LIST |
                    MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR;
                _base_add_sg_single_ieee(psge, sgl_flags, 0, data_out_sz,
                    data_out_dma);
        } else if (data_in_sz) /* READ */ {
                sgl_flags = MPI2_IEEE_SGE_FLAGS_SIMPLE_ELEMENT |
                    MPI25_IEEE_SGE_FLAGS_END_OF_LIST |
                    MPI2_IEEE_SGE_FLAGS_SYSTEM_ADDR;
                _base_add_sg_single_ieee(psge, sgl_flags, 0, data_in_sz,
                    data_in_dma);
        }
}

#define convert_to_kb(x) ((x) << (PAGE_SHIFT - 10))

/**
 * _base_config_dma_addressing - set dma addressing
 * @ioc: per adapter object
 * @pdev: PCI device struct
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_config_dma_addressing(struct MPT3SAS_ADAPTER *ioc, struct pci_dev *pdev)
{
        struct sysinfo s;
        u64 consistent_dma_mask;

        if (ioc->is_mcpu_endpoint)
                goto try_32bit;

        if (ioc->dma_mask)
                consistent_dma_mask = DMA_BIT_MASK(64);
        else
                consistent_dma_mask = DMA_BIT_MASK(32);

        if (sizeof(dma_addr_t) > 4) {
                const uint64_t required_mask =
                    dma_get_required_mask(&pdev->dev);
                if ((required_mask > DMA_BIT_MASK(32)) &&
                    !pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) &&
                    !pci_set_consistent_dma_mask(pdev, consistent_dma_mask)) {
                        ioc->base_add_sg_single = &_base_add_sg_single_64;
                        ioc->sge_size = sizeof(Mpi2SGESimple64_t);
                        ioc->dma_mask = 64;
                        goto out;
                }
        }

 try_32bit:
        if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(32))
            && !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32))) {
                ioc->base_add_sg_single = &_base_add_sg_single_32;
                ioc->sge_size = sizeof(Mpi2SGESimple32_t);
                ioc->dma_mask = 32;
        } else
                return -ENODEV;

 out:
        si_meminfo(&s);
        pr_info(MPT3SAS_FMT
                "%d BIT PCI BUS DMA ADDRESSING SUPPORTED, total mem (%ld kB)\n",
                ioc->name, ioc->dma_mask, convert_to_kb(s.totalram));

        return 0;
}

static int
_base_change_consistent_dma_mask(struct MPT3SAS_ADAPTER *ioc,
                                      struct pci_dev *pdev)
{
        if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
                if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)))
                        return -ENODEV;
        }
        return 0;
}

/**
 * _base_check_enable_msix - checks MSIX capabable.
 * @ioc: per adapter object
 *
 * Check to see if card is capable of MSIX, and set number
 * of available msix vectors
 */
static int
_base_check_enable_msix(struct MPT3SAS_ADAPTER *ioc)
{
        int base;
        u16 message_control;

        /* Check whether controller SAS2008 B0 controller,
         * if it is SAS2008 B0 controller use IO-APIC instead of MSIX
         */
        if (ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2008 &&
            ioc->pdev->revision == SAS2_PCI_DEVICE_B0_REVISION) {
                return -EINVAL;
        }

        base = pci_find_capability(ioc->pdev, PCI_CAP_ID_MSIX);
        if (!base) {
                dfailprintk(ioc, pr_info(MPT3SAS_FMT "msix not supported\n",
                        ioc->name));
                return -EINVAL;
        }

        /* get msix vector count */
        /* NUMA_IO not supported for older controllers */
        if (ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2004 ||
            ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2008 ||
            ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2108_1 ||
            ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2108_2 ||
            ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2108_3 ||
            ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2116_1 ||
            ioc->pdev->device == MPI2_MFGPAGE_DEVID_SAS2116_2)
                ioc->msix_vector_count = 1;
        else {
                pci_read_config_word(ioc->pdev, base + 2, &message_control);
                ioc->msix_vector_count = (message_control & 0x3FF) + 1;
        }
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "msix is supported, vector_count(%d)\n",
                ioc->name, ioc->msix_vector_count));
        return 0;
}

/**
 * _base_free_irq - free irq
 * @ioc: per adapter object
 *
 * Freeing respective reply_queue from the list.
 */
static void
_base_free_irq(struct MPT3SAS_ADAPTER *ioc)
{
        struct adapter_reply_queue *reply_q, *next;

        if (list_empty(&ioc->reply_queue_list))
                return;

        list_for_each_entry_safe(reply_q, next, &ioc->reply_queue_list, list) {
                list_del(&reply_q->list);
                free_irq(pci_irq_vector(ioc->pdev, reply_q->msix_index),
                         reply_q);
                kfree(reply_q);
        }
}

/**
 * _base_request_irq - request irq
 * @ioc: per adapter object
 * @index: msix index into vector table
 *
 * Inserting respective reply_queue into the list.
 */
static int
_base_request_irq(struct MPT3SAS_ADAPTER *ioc, u8 index)
{
        struct pci_dev *pdev = ioc->pdev;
        struct adapter_reply_queue *reply_q;
        int r;

        reply_q =  kzalloc(sizeof(struct adapter_reply_queue), GFP_KERNEL);
        if (!reply_q) {
                pr_err(MPT3SAS_FMT "unable to allocate memory %d!\n",
                    ioc->name, (int)sizeof(struct adapter_reply_queue));
                return -ENOMEM;
        }
        reply_q->ioc = ioc;
        reply_q->msix_index = index;

        atomic_set(&reply_q->busy, 0);
        if (ioc->msix_enable)
                snprintf(reply_q->name, MPT_NAME_LENGTH, "%s%d-msix%d",
                    ioc->driver_name, ioc->id, index);
        else
                snprintf(reply_q->name, MPT_NAME_LENGTH, "%s%d",
                    ioc->driver_name, ioc->id);
        r = request_irq(pci_irq_vector(pdev, index), _base_interrupt,
                        IRQF_SHARED, reply_q->name, reply_q);
        if (r) {
                pr_err(MPT3SAS_FMT "unable to allocate interrupt %d!\n",
                       reply_q->name, pci_irq_vector(pdev, index));
                kfree(reply_q);
                return -EBUSY;
        }

        INIT_LIST_HEAD(&reply_q->list);
        list_add_tail(&reply_q->list, &ioc->reply_queue_list);
        return 0;
}

/**
 * _base_assign_reply_queues - assigning msix index for each cpu
 * @ioc: per adapter object
 *
 * The enduser would need to set the affinity via /proc/irq/#/smp_affinity
 *
 * It would nice if we could call irq_set_affinity, however it is not
 * an exported symbol
 */
static void
_base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
{
        unsigned int cpu, nr_cpus, nr_msix, index = 0;
        struct adapter_reply_queue *reply_q;

        if (!_base_is_controller_msix_enabled(ioc))
                return;

        memset(ioc->cpu_msix_table, 0, ioc->cpu_msix_table_sz);

        nr_cpus = num_online_cpus();
        nr_msix = ioc->reply_queue_count = min(ioc->reply_queue_count,
                                               ioc->facts.MaxMSIxVectors);
        if (!nr_msix)
                return;

        if (smp_affinity_enable) {
                list_for_each_entry(reply_q, &ioc->reply_queue_list, list) {
                        const cpumask_t *mask = pci_irq_get_affinity(ioc->pdev,
                                                        reply_q->msix_index);
                        if (!mask) {
                                pr_warn(MPT3SAS_FMT "no affinity for msi %x\n",
                                        ioc->name, reply_q->msix_index);
                                continue;
                        }

                        for_each_cpu_and(cpu, mask, cpu_online_mask) {
                                if (cpu >= ioc->cpu_msix_table_sz)
                                        break;
                                ioc->cpu_msix_table[cpu] = reply_q->msix_index;
                        }
                }
                return;
        }
        cpu = cpumask_first(cpu_online_mask);

        list_for_each_entry(reply_q, &ioc->reply_queue_list, list) {

                unsigned int i, group = nr_cpus / nr_msix;

                if (cpu >= nr_cpus)
                        break;

                if (index < nr_cpus % nr_msix)
                        group++;

                for (i = 0 ; i < group ; i++) {
                        ioc->cpu_msix_table[cpu] = reply_q->msix_index;
                        cpu = cpumask_next(cpu, cpu_online_mask);
                }
                index++;
        }
}

/**
 * _base_disable_msix - disables msix
 * @ioc: per adapter object
 *
 */
static void
_base_disable_msix(struct MPT3SAS_ADAPTER *ioc)
{
        if (!ioc->msix_enable)
                return;
        pci_disable_msix(ioc->pdev);
        ioc->msix_enable = 0;
}

/**
 * _base_enable_msix - enables msix, failback to io_apic
 * @ioc: per adapter object
 *
 */
static int
_base_enable_msix(struct MPT3SAS_ADAPTER *ioc)
{
        int r;
        int i, local_max_msix_vectors;
        u8 try_msix = 0;
        unsigned int irq_flags = PCI_IRQ_MSIX;

        if (msix_disable == -1 || msix_disable == 0)
                try_msix = 1;

        if (!try_msix)
                goto try_ioapic;

        if (_base_check_enable_msix(ioc) != 0)
                goto try_ioapic;

        ioc->reply_queue_count = min_t(int, ioc->cpu_count,
                ioc->msix_vector_count);

        printk(MPT3SAS_FMT "MSI-X vectors supported: %d, no of cores"
          ": %d, max_msix_vectors: %d\n", ioc->name, ioc->msix_vector_count,
          ioc->cpu_count, max_msix_vectors);

        if (!ioc->rdpq_array_enable && max_msix_vectors == -1)
                local_max_msix_vectors = (reset_devices) ? 1 : 8;
        else
                local_max_msix_vectors = max_msix_vectors;

        if (local_max_msix_vectors > 0)
                ioc->reply_queue_count = min_t(int, local_max_msix_vectors,
                        ioc->reply_queue_count);
        else if (local_max_msix_vectors == 0)
                goto try_ioapic;

        if (ioc->msix_vector_count < ioc->cpu_count)
                smp_affinity_enable = 0;

        if (smp_affinity_enable)
                irq_flags |= PCI_IRQ_AFFINITY;

        r = pci_alloc_irq_vectors(ioc->pdev, 1, ioc->reply_queue_count,
                                  irq_flags);
        if (r < 0) {
                dfailprintk(ioc, pr_info(MPT3SAS_FMT
                        "pci_alloc_irq_vectors failed (r=%d) !!!\n",
                        ioc->name, r));
                goto try_ioapic;
        }

        ioc->msix_enable = 1;
        ioc->reply_queue_count = r;
        for (i = 0; i < ioc->reply_queue_count; i++) {
                r = _base_request_irq(ioc, i);
                if (r) {
                        _base_free_irq(ioc);
                        _base_disable_msix(ioc);
                        goto try_ioapic;
                }
        }

        return 0;

/* failback to io_apic interrupt routing */
 try_ioapic:

        ioc->reply_queue_count = 1;
        r = pci_alloc_irq_vectors(ioc->pdev, 1, 1, PCI_IRQ_LEGACY);
        if (r < 0) {
                dfailprintk(ioc, pr_info(MPT3SAS_FMT
                        "pci_alloc_irq_vector(legacy) failed (r=%d) !!!\n",
                        ioc->name, r));
        } else
                r = _base_request_irq(ioc, 0);

        return r;
}

/**
 * mpt3sas_base_unmap_resources - free controller resources
 * @ioc: per adapter object
 */
static void
mpt3sas_base_unmap_resources(struct MPT3SAS_ADAPTER *ioc)
{
        struct pci_dev *pdev = ioc->pdev;

        dexitprintk(ioc, printk(MPT3SAS_FMT "%s\n",
                ioc->name, __func__));

        _base_free_irq(ioc);
        _base_disable_msix(ioc);

        if (ioc->combined_reply_queue) {
                kfree(ioc->replyPostRegisterIndex);
                ioc->replyPostRegisterIndex = NULL;
        }

        if (ioc->chip_phys) {
                iounmap(ioc->chip);
                ioc->chip_phys = 0;
        }

        if (pci_is_enabled(pdev)) {
                pci_release_selected_regions(ioc->pdev, ioc->bars);
                pci_disable_pcie_error_reporting(pdev);
                pci_disable_device(pdev);
        }
}

/**
 * mpt3sas_base_map_resources - map in controller resources (io/irq/memap)
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_base_map_resources(struct MPT3SAS_ADAPTER *ioc)
{
        struct pci_dev *pdev = ioc->pdev;
        u32 memap_sz;
        u32 pio_sz;
        int i, r = 0;
        u64 pio_chip = 0;
        phys_addr_t chip_phys = 0;
        struct adapter_reply_queue *reply_q;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n",
            ioc->name, __func__));

        ioc->bars = pci_select_bars(pdev, IORESOURCE_MEM);
        if (pci_enable_device_mem(pdev)) {
                pr_warn(MPT3SAS_FMT "pci_enable_device_mem: failed\n",
                        ioc->name);
                ioc->bars = 0;
                return -ENODEV;
        }


        if (pci_request_selected_regions(pdev, ioc->bars,
            ioc->driver_name)) {
                pr_warn(MPT3SAS_FMT "pci_request_selected_regions: failed\n",
                        ioc->name);
                ioc->bars = 0;
                r = -ENODEV;
                goto out_fail;
        }

/* AER (Advanced Error Reporting) hooks */
        pci_enable_pcie_error_reporting(pdev);

        pci_set_master(pdev);


        if (_base_config_dma_addressing(ioc, pdev) != 0) {
                pr_warn(MPT3SAS_FMT "no suitable DMA mask for %s\n",
                    ioc->name, pci_name(pdev));
                r = -ENODEV;
                goto out_fail;
        }

        for (i = 0, memap_sz = 0, pio_sz = 0; (i < DEVICE_COUNT_RESOURCE) &&
             (!memap_sz || !pio_sz); i++) {
                if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
                        if (pio_sz)
                                continue;
                        pio_chip = (u64)pci_resource_start(pdev, i);
                        pio_sz = pci_resource_len(pdev, i);
                } else if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
                        if (memap_sz)
                                continue;
                        ioc->chip_phys = pci_resource_start(pdev, i);
                        chip_phys = ioc->chip_phys;
                        memap_sz = pci_resource_len(pdev, i);
                        ioc->chip = ioremap(ioc->chip_phys, memap_sz);
                }
        }

        if (ioc->chip == NULL) {
                pr_err(MPT3SAS_FMT "unable to map adapter memory! "
                        " or resource not found\n", ioc->name);
                r = -EINVAL;
                goto out_fail;
        }

        _base_mask_interrupts(ioc);

        r = _base_get_ioc_facts(ioc);
        if (r)
                goto out_fail;

        if (!ioc->rdpq_array_enable_assigned) {
                ioc->rdpq_array_enable = ioc->rdpq_array_capable;
                ioc->rdpq_array_enable_assigned = 1;
        }

        r = _base_enable_msix(ioc);
        if (r)
                goto out_fail;

        /* Use the Combined reply queue feature only for SAS3 C0 & higher
         * revision HBAs and also only when reply queue count is greater than 8
         */
        if (ioc->combined_reply_queue && ioc->reply_queue_count > 8) {
                /* Determine the Supplemental Reply Post Host Index Registers
                 * Addresse. Supplemental Reply Post Host Index Registers
                 * starts at offset MPI25_SUP_REPLY_POST_HOST_INDEX_OFFSET and
                 * each register is at offset bytes of
                 * MPT3_SUP_REPLY_POST_HOST_INDEX_REG_OFFSET from previous one.
                 */
                ioc->replyPostRegisterIndex = kcalloc(
                     ioc->combined_reply_index_count,
                     sizeof(resource_size_t *), GFP_KERNEL);
                if (!ioc->replyPostRegisterIndex) {
                        dfailprintk(ioc, printk(MPT3SAS_FMT
                        "allocation for reply Post Register Index failed!!!\n",
                                                                   ioc->name));
                        r = -ENOMEM;
                        goto out_fail;
                }

                for (i = 0; i < ioc->combined_reply_index_count; i++) {
                        ioc->replyPostRegisterIndex[i] = (resource_size_t *)
                             ((u8 *)&ioc->chip->Doorbell +
                             MPI25_SUP_REPLY_POST_HOST_INDEX_OFFSET +
                             (i * MPT3_SUP_REPLY_POST_HOST_INDEX_REG_OFFSET));
                }
        } else
                ioc->combined_reply_queue = 0;

        if (ioc->is_warpdrive) {
                ioc->reply_post_host_index[0] = (resource_size_t __iomem *)
                    &ioc->chip->ReplyPostHostIndex;

                for (i = 1; i < ioc->cpu_msix_table_sz; i++)
                        ioc->reply_post_host_index[i] =
                        (resource_size_t __iomem *)
                        ((u8 __iomem *)&ioc->chip->Doorbell + (0x4000 + ((i - 1)
                        * 4)));
        }

        list_for_each_entry(reply_q, &ioc->reply_queue_list, list)
                pr_info(MPT3SAS_FMT "%s: IRQ %d\n",
                    reply_q->name,  ((ioc->msix_enable) ? "PCI-MSI-X enabled" :
                    "IO-APIC enabled"),
                    pci_irq_vector(ioc->pdev, reply_q->msix_index));

        pr_info(MPT3SAS_FMT "iomem(%pap), mapped(0x%p), size(%d)\n",
            ioc->name, &chip_phys, ioc->chip, memap_sz);
        pr_info(MPT3SAS_FMT "ioport(0x%016llx), size(%d)\n",
            ioc->name, (unsigned long long)pio_chip, pio_sz);

        /* Save PCI configuration state for recovery from PCI AER/EEH errors */
        pci_save_state(pdev);
        return 0;

 out_fail:
        mpt3sas_base_unmap_resources(ioc);
        return r;
}

/**
 * mpt3sas_base_get_msg_frame - obtain request mf pointer
 * @ioc: per adapter object
 * @smid: system request message index(smid zero is invalid)
 *
 * Returns virt pointer to message frame.
 */
void *
mpt3sas_base_get_msg_frame(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        return (void *)(ioc->request + (smid * ioc->request_sz));
}

/**
 * mpt3sas_base_get_sense_buffer - obtain a sense buffer virt addr
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Returns virt pointer to sense buffer.
 */
void *
mpt3sas_base_get_sense_buffer(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        return (void *)(ioc->sense + ((smid - 1) * SCSI_SENSE_BUFFERSIZE));
}

/**
 * mpt3sas_base_get_sense_buffer_dma - obtain a sense buffer dma addr
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Returns phys pointer to the low 32bit address of the sense buffer.
 */
__le32
mpt3sas_base_get_sense_buffer_dma(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        return cpu_to_le32(ioc->sense_dma + ((smid - 1) *
            SCSI_SENSE_BUFFERSIZE));
}

/**
 * mpt3sas_base_get_pcie_sgl - obtain a PCIe SGL virt addr
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Returns virt pointer to a PCIe SGL.
 */
void *
mpt3sas_base_get_pcie_sgl(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        return (void *)(ioc->pcie_sg_lookup[smid - 1].pcie_sgl);
}

/**
 * mpt3sas_base_get_pcie_sgl_dma - obtain a PCIe SGL dma addr
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Returns phys pointer to the address of the PCIe buffer.
 */
dma_addr_t
mpt3sas_base_get_pcie_sgl_dma(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        return ioc->pcie_sg_lookup[smid - 1].pcie_sgl_dma;
}

/**
 * mpt3sas_base_get_reply_virt_addr - obtain reply frames virt address
 * @ioc: per adapter object
 * @phys_addr: lower 32 physical addr of the reply
 *
 * Converts 32bit lower physical addr into a virt address.
 */
void *
mpt3sas_base_get_reply_virt_addr(struct MPT3SAS_ADAPTER *ioc, u32 phys_addr)
{
        if (!phys_addr)
                return NULL;
        return ioc->reply + (phys_addr - (u32)ioc->reply_dma);
}

static inline u8
_base_get_msix_index(struct MPT3SAS_ADAPTER *ioc)
{
        return ioc->cpu_msix_table[raw_smp_processor_id()];
}

/**
 * mpt3sas_base_get_smid - obtain a free smid from internal queue
 * @ioc: per adapter object
 * @cb_idx: callback index
 *
 * Returns smid (zero is invalid)
 */
u16
mpt3sas_base_get_smid(struct MPT3SAS_ADAPTER *ioc, u8 cb_idx)
{
        unsigned long flags;
        struct request_tracker *request;
        u16 smid;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (list_empty(&ioc->internal_free_list)) {
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                pr_err(MPT3SAS_FMT "%s: smid not available\n",
                    ioc->name, __func__);
                return 0;
        }

        request = list_entry(ioc->internal_free_list.next,
            struct request_tracker, tracker_list);
        request->cb_idx = cb_idx;
        smid = request->smid;
        list_del(&request->tracker_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        return smid;
}

/**
 * mpt3sas_base_get_smid_scsiio - obtain a free smid from scsiio queue
 * @ioc: per adapter object
 * @cb_idx: callback index
 * @scmd: pointer to scsi command object
 *
 * Returns smid (zero is invalid)
 */
u16
mpt3sas_base_get_smid_scsiio(struct MPT3SAS_ADAPTER *ioc, u8 cb_idx,
        struct scsi_cmnd *scmd)
{
        struct scsiio_tracker *request = scsi_cmd_priv(scmd);
        unsigned int tag = scmd->request->tag;
        u16 smid;

        smid = tag + 1;
        request->cb_idx = cb_idx;
        request->msix_io = _base_get_msix_index(ioc);
        request->smid = smid;
        INIT_LIST_HEAD(&request->chain_list);
        return smid;
}

/**
 * mpt3sas_base_get_smid_hpr - obtain a free smid from hi-priority queue
 * @ioc: per adapter object
 * @cb_idx: callback index
 *
 * Returns smid (zero is invalid)
 */
u16
mpt3sas_base_get_smid_hpr(struct MPT3SAS_ADAPTER *ioc, u8 cb_idx)
{
        unsigned long flags;
        struct request_tracker *request;
        u16 smid;

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (list_empty(&ioc->hpr_free_list)) {
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
                return 0;
        }

        request = list_entry(ioc->hpr_free_list.next,
            struct request_tracker, tracker_list);
        request->cb_idx = cb_idx;
        smid = request->smid;
        list_del(&request->tracker_list);
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        return smid;
}

static void
_base_recovery_check(struct MPT3SAS_ADAPTER *ioc)
{
        /*
         * See _wait_for_commands_to_complete() call with regards to this code.
         */
        if (ioc->shost_recovery && ioc->pending_io_count) {
                ioc->pending_io_count = atomic_read(&ioc->shost->host_busy);
                if (ioc->pending_io_count == 0)
                        wake_up(&ioc->reset_wq);
        }
}

void mpt3sas_base_clear_st(struct MPT3SAS_ADAPTER *ioc,
                           struct scsiio_tracker *st)
{
        if (WARN_ON(st->smid == 0))
                return;
        st->cb_idx = 0xFF;
        st->direct_io = 0;
        if (!list_empty(&st->chain_list)) {
                unsigned long flags;

                spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
                list_splice_init(&st->chain_list, &ioc->free_chain_list);
                spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
        }
}

/**
 * mpt3sas_base_free_smid - put smid back on free_list
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return nothing.
 */
void
mpt3sas_base_free_smid(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        unsigned long flags;
        int i;

        if (smid < ioc->hi_priority_smid) {
                struct scsiio_tracker *st;

                st = _get_st_from_smid(ioc, smid);
                if (!st) {
                        _base_recovery_check(ioc);
                        return;
                }
                mpt3sas_base_clear_st(ioc, st);
                _base_recovery_check(ioc);
                return;
        }

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);
        if (smid < ioc->internal_smid) {
                /* hi-priority */
                i = smid - ioc->hi_priority_smid;
                ioc->hpr_lookup[i].cb_idx = 0xFF;
                list_add(&ioc->hpr_lookup[i].tracker_list, &ioc->hpr_free_list);
        } else if (smid <= ioc->hba_queue_depth) {
                /* internal queue */
                i = smid - ioc->internal_smid;
                ioc->internal_lookup[i].cb_idx = 0xFF;
                list_add(&ioc->internal_lookup[i].tracker_list,
                    &ioc->internal_free_list);
        }
        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);
}

/**
 * _base_mpi_ep_writeq - 32 bit write to MMIO
 * @b: data payload
 * @addr: address in MMIO space
 * @writeq_lock: spin lock
 *
 * This special handling for MPI EP to take care of 32 bit
 * environment where its not quarenteed to send the entire word
 * in one transfer.
 */
static inline void
_base_mpi_ep_writeq(__u64 b, volatile void __iomem *addr,
                                        spinlock_t *writeq_lock)
{
        unsigned long flags;
        __u64 data_out = cpu_to_le64(b);

        spin_lock_irqsave(writeq_lock, flags);
        writel((u32)(data_out), addr);
        writel((u32)(data_out >> 32), (addr + 4));
        spin_unlock_irqrestore(writeq_lock, flags);
}

/**
 * _base_writeq - 64 bit write to MMIO
 * @ioc: per adapter object
 * @b: data payload
 * @addr: address in MMIO space
 * @writeq_lock: spin lock
 *
 * Glue for handling an atomic 64 bit word to MMIO. This special handling takes
 * care of 32 bit environment where its not quarenteed to send the entire word
 * in one transfer.
 */
#if defined(writeq) && defined(CONFIG_64BIT)
static inline void
_base_writeq(__u64 b, volatile void __iomem *addr, spinlock_t *writeq_lock)
{
        writeq(cpu_to_le64(b), addr);
}
#else
static inline void
_base_writeq(__u64 b, volatile void __iomem *addr, spinlock_t *writeq_lock)
{
        _base_mpi_ep_writeq(b, addr, writeq_lock);
}
#endif

/**
 * _base_put_smid_mpi_ep_scsi_io - send SCSI_IO request to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 * @handle: device handle
 *
 * Return nothing.
 */
static void
_base_put_smid_mpi_ep_scsi_io(struct MPT3SAS_ADAPTER *ioc, u16 smid, u16 handle)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;
        void *mpi_req_iomem;
        __le32 *mfp = (__le32 *)mpt3sas_base_get_msg_frame(ioc, smid);

        _clone_sg_entries(ioc, (void *) mfp, smid);
        mpi_req_iomem = (void *)ioc->chip +
                        MPI_FRAME_START_OFFSET + (smid * ioc->request_sz);
        _base_clone_mpi_to_sys_mem(mpi_req_iomem, (void *)mfp,
                                        ioc->request_sz);
        descriptor.SCSIIO.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO;
        descriptor.SCSIIO.MSIxIndex =  _base_get_msix_index(ioc);
        descriptor.SCSIIO.SMID = cpu_to_le16(smid);
        descriptor.SCSIIO.DevHandle = cpu_to_le16(handle);
        descriptor.SCSIIO.LMID = 0;
        _base_mpi_ep_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * _base_put_smid_scsi_io - send SCSI_IO request to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 * @handle: device handle
 *
 * Return nothing.
 */
static void
_base_put_smid_scsi_io(struct MPT3SAS_ADAPTER *ioc, u16 smid, u16 handle)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;


        descriptor.SCSIIO.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_SCSI_IO;
        descriptor.SCSIIO.MSIxIndex =  _base_get_msix_index(ioc);
        descriptor.SCSIIO.SMID = cpu_to_le16(smid);
        descriptor.SCSIIO.DevHandle = cpu_to_le16(handle);
        descriptor.SCSIIO.LMID = 0;
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * mpt3sas_base_put_smid_fast_path - send fast path request to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 * @handle: device handle
 *
 * Return nothing.
 */
void
mpt3sas_base_put_smid_fast_path(struct MPT3SAS_ADAPTER *ioc, u16 smid,
        u16 handle)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;

        descriptor.SCSIIO.RequestFlags =
            MPI25_REQ_DESCRIPT_FLAGS_FAST_PATH_SCSI_IO;
        descriptor.SCSIIO.MSIxIndex = _base_get_msix_index(ioc);
        descriptor.SCSIIO.SMID = cpu_to_le16(smid);
        descriptor.SCSIIO.DevHandle = cpu_to_le16(handle);
        descriptor.SCSIIO.LMID = 0;
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * mpt3sas_base_put_smid_hi_priority - send Task Management request to firmware
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_task: msix_task will be same as msix of IO incase of task abort else 0.
 * Return nothing.
 */
void
mpt3sas_base_put_smid_hi_priority(struct MPT3SAS_ADAPTER *ioc, u16 smid,
        u16 msix_task)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        void *mpi_req_iomem;
        u64 *request;

        if (ioc->is_mcpu_endpoint) {
                MPI2RequestHeader_t *request_hdr;

                __le32 *mfp = (__le32 *)mpt3sas_base_get_msg_frame(ioc, smid);

                request_hdr = (MPI2RequestHeader_t *)mfp;
                /* TBD 256 is offset within sys register. */
                mpi_req_iomem = (void *)ioc->chip + MPI_FRAME_START_OFFSET
                                        + (smid * ioc->request_sz);
                _base_clone_mpi_to_sys_mem(mpi_req_iomem, (void *)mfp,
                                                        ioc->request_sz);
        }

        request = (u64 *)&descriptor;

        descriptor.HighPriority.RequestFlags =
            MPI2_REQ_DESCRIPT_FLAGS_HIGH_PRIORITY;
        descriptor.HighPriority.MSIxIndex =  msix_task;
        descriptor.HighPriority.SMID = cpu_to_le16(smid);
        descriptor.HighPriority.LMID = 0;
        descriptor.HighPriority.Reserved1 = 0;
        if (ioc->is_mcpu_endpoint)
                _base_mpi_ep_writeq(*request,
                                &ioc->chip->RequestDescriptorPostLow,
                                &ioc->scsi_lookup_lock);
        else
                _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
                    &ioc->scsi_lookup_lock);
}

/**
 * mpt3sas_base_put_smid_nvme_encap - send NVMe encapsulated request to
 *  firmware
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return nothing.
 */
void
mpt3sas_base_put_smid_nvme_encap(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        u64 *request = (u64 *)&descriptor;

        descriptor.Default.RequestFlags =
                MPI26_REQ_DESCRIPT_FLAGS_PCIE_ENCAPSULATED;
        descriptor.Default.MSIxIndex =  _base_get_msix_index(ioc);
        descriptor.Default.SMID = cpu_to_le16(smid);
        descriptor.Default.LMID = 0;
        descriptor.Default.DescriptorTypeDependent = 0;
        _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
            &ioc->scsi_lookup_lock);
}

/**
 * mpt3sas_base_put_smid_default - Default, primarily used for config pages
 * @ioc: per adapter object
 * @smid: system request message index
 *
 * Return nothing.
 */
void
mpt3sas_base_put_smid_default(struct MPT3SAS_ADAPTER *ioc, u16 smid)
{
        Mpi2RequestDescriptorUnion_t descriptor;
        void *mpi_req_iomem;
        u64 *request;
        MPI2RequestHeader_t *request_hdr;

        if (ioc->is_mcpu_endpoint) {
                __le32 *mfp = (__le32 *)mpt3sas_base_get_msg_frame(ioc, smid);

                request_hdr = (MPI2RequestHeader_t *)mfp;

                _clone_sg_entries(ioc, (void *) mfp, smid);
                /* TBD 256 is offset within sys register */
                mpi_req_iomem = (void *)ioc->chip +
                        MPI_FRAME_START_OFFSET + (smid * ioc->request_sz);
                _base_clone_mpi_to_sys_mem(mpi_req_iomem, (void *)mfp,
                                                        ioc->request_sz);
        }
        request = (u64 *)&descriptor;
        descriptor.Default.RequestFlags = MPI2_REQ_DESCRIPT_FLAGS_DEFAULT_TYPE;
        descriptor.Default.MSIxIndex =  _base_get_msix_index(ioc);
        descriptor.Default.SMID = cpu_to_le16(smid);
        descriptor.Default.LMID = 0;
        descriptor.Default.DescriptorTypeDependent = 0;
        if (ioc->is_mcpu_endpoint)
                _base_mpi_ep_writeq(*request,
                                &ioc->chip->RequestDescriptorPostLow,
                                &ioc->scsi_lookup_lock);
        else
                _base_writeq(*request, &ioc->chip->RequestDescriptorPostLow,
                                &ioc->scsi_lookup_lock);
}

/**
 * _base_display_OEMs_branding - Display branding string
 * @ioc: per adapter object
 *
 * Return nothing.
 */
static void
_base_display_OEMs_branding(struct MPT3SAS_ADAPTER *ioc)
{
        if (ioc->pdev->subsystem_vendor != PCI_VENDOR_ID_INTEL)
                return;

        switch (ioc->pdev->subsystem_vendor) {
        case PCI_VENDOR_ID_INTEL:
                switch (ioc->pdev->device) {
                case MPI2_MFGPAGE_DEVID_SAS2008:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT2SAS_INTEL_RMS2LL080_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS2LL080_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS2LL040_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS2LL040_BRANDING);
                                break;
                        case MPT2SAS_INTEL_SSD910_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_SSD910_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                 "Intel(R) Controller: Subsystem ID: 0x%X\n",
                                 ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                case MPI2_MFGPAGE_DEVID_SAS2308_2:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT2SAS_INTEL_RS25GB008_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RS25GB008_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS25JB080_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS25JB080_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS25JB040_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS25JB040_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS25KB080_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS25KB080_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS25KB040_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS25KB040_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS25LB040_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS25LB040_BRANDING);
                                break;
                        case MPT2SAS_INTEL_RMS25LB080_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_INTEL_RMS25LB080_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                 "Intel(R) Controller: Subsystem ID: 0x%X\n",
                                 ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                case MPI25_MFGPAGE_DEVID_SAS3008:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT3SAS_INTEL_RMS3JC080_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_INTEL_RMS3JC080_BRANDING);
                                break;

                        case MPT3SAS_INTEL_RS3GC008_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_INTEL_RS3GC008_BRANDING);
                                break;
                        case MPT3SAS_INTEL_RS3FC044_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_INTEL_RS3FC044_BRANDING);
                                break;
                        case MPT3SAS_INTEL_RS3UC080_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_INTEL_RS3UC080_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                 "Intel(R) Controller: Subsystem ID: 0x%X\n",
                                 ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                        break;
                default:
                        pr_info(MPT3SAS_FMT
                         "Intel(R) Controller: Subsystem ID: 0x%X\n",
                         ioc->name, ioc->pdev->subsystem_device);
                        break;
                }
                break;
        case PCI_VENDOR_ID_DELL:
                switch (ioc->pdev->device) {
                case MPI2_MFGPAGE_DEVID_SAS2008:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT2SAS_DELL_6GBPS_SAS_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_6GBPS_SAS_HBA_BRANDING);
                                break;
                        case MPT2SAS_DELL_PERC_H200_ADAPTER_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_PERC_H200_ADAPTER_BRANDING);
                                break;
                        case MPT2SAS_DELL_PERC_H200_INTEGRATED_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_PERC_H200_INTEGRATED_BRANDING);
                                break;
                        case MPT2SAS_DELL_PERC_H200_MODULAR_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_PERC_H200_MODULAR_BRANDING);
                                break;
                        case MPT2SAS_DELL_PERC_H200_EMBEDDED_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_PERC_H200_EMBEDDED_BRANDING);
                                break;
                        case MPT2SAS_DELL_PERC_H200_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_PERC_H200_BRANDING);
                                break;
                        case MPT2SAS_DELL_6GBPS_SAS_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_DELL_6GBPS_SAS_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                   "Dell 6Gbps HBA: Subsystem ID: 0x%X\n",
                                   ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                        break;
                case MPI25_MFGPAGE_DEVID_SAS3008:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT3SAS_DELL_12G_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_DELL_12G_HBA_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                   "Dell 12Gbps HBA: Subsystem ID: 0x%X\n",
                                   ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                        break;
                default:
                        pr_info(MPT3SAS_FMT
                           "Dell HBA: Subsystem ID: 0x%X\n", ioc->name,
                           ioc->pdev->subsystem_device);
                        break;
                }
                break;
        case PCI_VENDOR_ID_CISCO:
                switch (ioc->pdev->device) {
                case MPI25_MFGPAGE_DEVID_SAS3008:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT3SAS_CISCO_12G_8E_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_CISCO_12G_8E_HBA_BRANDING);
                                break;
                        case MPT3SAS_CISCO_12G_8I_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_CISCO_12G_8I_HBA_BRANDING);
                                break;
                        case MPT3SAS_CISCO_12G_AVILA_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                        MPT3SAS_CISCO_12G_AVILA_HBA_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                  "Cisco 12Gbps SAS HBA: Subsystem ID: 0x%X\n",
                                  ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                        break;
                case MPI25_MFGPAGE_DEVID_SAS3108_1:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT3SAS_CISCO_12G_AVILA_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                MPT3SAS_CISCO_12G_AVILA_HBA_BRANDING);
                                break;
                        case MPT3SAS_CISCO_12G_COLUSA_MEZZANINE_HBA_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                MPT3SAS_CISCO_12G_COLUSA_MEZZANINE_HBA_BRANDING
                                );
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                 "Cisco 12Gbps SAS HBA: Subsystem ID: 0x%X\n",
                                 ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                        break;
                default:
                        pr_info(MPT3SAS_FMT
                           "Cisco SAS HBA: Subsystem ID: 0x%X\n",
                           ioc->name, ioc->pdev->subsystem_device);
                        break;
                }
                break;
        case MPT2SAS_HP_3PAR_SSVID:
                switch (ioc->pdev->device) {
                case MPI2_MFGPAGE_DEVID_SAS2004:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT2SAS_HP_DAUGHTER_2_4_INTERNAL_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_HP_DAUGHTER_2_4_INTERNAL_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                   "HP 6Gbps SAS HBA: Subsystem ID: 0x%X\n",
                                   ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                case MPI2_MFGPAGE_DEVID_SAS2308_2:
                        switch (ioc->pdev->subsystem_device) {
                        case MPT2SAS_HP_2_4_INTERNAL_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_HP_2_4_INTERNAL_BRANDING);
                                break;
                        case MPT2SAS_HP_2_4_EXTERNAL_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_HP_2_4_EXTERNAL_BRANDING);
                                break;
                        case MPT2SAS_HP_1_4_INTERNAL_1_4_EXTERNAL_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                 MPT2SAS_HP_1_4_INTERNAL_1_4_EXTERNAL_BRANDING);
                                break;
                        case MPT2SAS_HP_EMBEDDED_2_4_INTERNAL_SSDID:
                                pr_info(MPT3SAS_FMT "%s\n", ioc->name,
                                    MPT2SAS_HP_EMBEDDED_2_4_INTERNAL_BRANDING);
                                break;
                        default:
                                pr_info(MPT3SAS_FMT
                                   "HP 6Gbps SAS HBA: Subsystem ID: 0x%X\n",
                                   ioc->name, ioc->pdev->subsystem_device);
                                break;
                        }
                default:
                        pr_info(MPT3SAS_FMT
                           "HP SAS HBA: Subsystem ID: 0x%X\n",
                           ioc->name, ioc->pdev->subsystem_device);
                        break;
                }
        default:
                break;
        }
}

/**
 * _base_display_ioc_capabilities - Disply IOC's capabilities.
 * @ioc: per adapter object
 *
 * Return nothing.
 */
static void
_base_display_ioc_capabilities(struct MPT3SAS_ADAPTER *ioc)
{
        int i = 0;
        char desc[16];
        u32 iounit_pg1_flags;
        u32 bios_version;

        bios_version = le32_to_cpu(ioc->bios_pg3.BiosVersion);
        strncpy(desc, ioc->manu_pg0.ChipName, 16);
        pr_info(MPT3SAS_FMT "%s: FWVersion(%02d.%02d.%02d.%02d), "\
           "ChipRevision(0x%02x), BiosVersion(%02d.%02d.%02d.%02d)\n",
            ioc->name, desc,
           (ioc->facts.FWVersion.Word & 0xFF000000) >> 24,
           (ioc->facts.FWVersion.Word & 0x00FF0000) >> 16,
           (ioc->facts.FWVersion.Word & 0x0000FF00) >> 8,
           ioc->facts.FWVersion.Word & 0x000000FF,
           ioc->pdev->revision,
           (bios_version & 0xFF000000) >> 24,
           (bios_version & 0x00FF0000) >> 16,
           (bios_version & 0x0000FF00) >> 8,
            bios_version & 0x000000FF);

        _base_display_OEMs_branding(ioc);

        if (ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_NVME_DEVICES) {
                pr_info("%sNVMe", i ? "," : "");
                i++;
        }

        pr_info(MPT3SAS_FMT "Protocol=(", ioc->name);

        if (ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_INITIATOR) {
                pr_info("Initiator");
                i++;
        }

        if (ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_SCSI_TARGET) {
                pr_info("%sTarget", i ? "," : "");
                i++;
        }

        i = 0;
        pr_info("), ");
        pr_info("Capabilities=(");

        if (!ioc->hide_ir_msg) {
                if (ioc->facts.IOCCapabilities &
                    MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID) {
                        pr_info("Raid");
                        i++;
                }
        }

        if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_TLR) {
                pr_info("%sTLR", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_MULTICAST) {
                pr_info("%sMulticast", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_BIDIRECTIONAL_TARGET) {
                pr_info("%sBIDI Target", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_EEDP) {
                pr_info("%sEEDP", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_SNAPSHOT_BUFFER) {
                pr_info("%sSnapshot Buffer", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_DIAG_TRACE_BUFFER) {
                pr_info("%sDiag Trace Buffer", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_EXTENDED_BUFFER) {
                pr_info("%sDiag Extended Buffer", i ? "," : "");
                i++;
        }

        if (ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_TASK_SET_FULL_HANDLING) {
                pr_info("%sTask Set Full", i ? "," : "");
                i++;
        }

        iounit_pg1_flags = le32_to_cpu(ioc->iounit_pg1.Flags);
        if (!(iounit_pg1_flags & MPI2_IOUNITPAGE1_NATIVE_COMMAND_Q_DISABLE)) {
                pr_info("%sNCQ", i ? "," : "");
                i++;
        }

        pr_info(")\n");
}

/**
 * mpt3sas_base_update_missing_delay - change the missing delay timers
 * @ioc: per adapter object
 * @device_missing_delay: amount of time till device is reported missing
 * @io_missing_delay: interval IO is returned when there is a missing device
 *
 * Return nothing.
 *
 * Passed on the command line, this function will modify the device missing
 * delay, as well as the io missing delay. This should be called at driver
 * load time.
 */
void
mpt3sas_base_update_missing_delay(struct MPT3SAS_ADAPTER *ioc,
        u16 device_missing_delay, u8 io_missing_delay)
{
        u16 dmd, dmd_new, dmd_orignal;
        u8 io_missing_delay_original;
        u16 sz;
        Mpi2SasIOUnitPage1_t *sas_iounit_pg1 = NULL;
        Mpi2ConfigReply_t mpi_reply;
        u8 num_phys = 0;
        u16 ioc_status;

        mpt3sas_config_get_number_hba_phys(ioc, &num_phys);
        if (!num_phys)
                return;

        sz = offsetof(Mpi2SasIOUnitPage1_t, PhyData) + (num_phys *
            sizeof(Mpi2SasIOUnit1PhyData_t));
        sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL);
        if (!sas_iounit_pg1) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        if ((mpt3sas_config_get_sas_iounit_pg1(ioc, &mpi_reply,
            sas_iounit_pg1, sz))) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }
        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) &
            MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
                    ioc->name, __FILE__, __LINE__, __func__);
                goto out;
        }

        /* device missing delay */
        dmd = sas_iounit_pg1->ReportDeviceMissingDelay;
        if (dmd & MPI2_SASIOUNIT1_REPORT_MISSING_UNIT_16)
                dmd = (dmd & MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK) * 16;
        else
                dmd = dmd & MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK;
        dmd_orignal = dmd;
        if (device_missing_delay > 0x7F) {
                dmd = (device_missing_delay > 0x7F0) ? 0x7F0 :
                    device_missing_delay;
                dmd = dmd / 16;
                dmd |= MPI2_SASIOUNIT1_REPORT_MISSING_UNIT_16;
        } else
                dmd = device_missing_delay;
        sas_iounit_pg1->ReportDeviceMissingDelay = dmd;

        /* io missing delay */
        io_missing_delay_original = sas_iounit_pg1->IODeviceMissingDelay;
        sas_iounit_pg1->IODeviceMissingDelay = io_missing_delay;

        if (!mpt3sas_config_set_sas_iounit_pg1(ioc, &mpi_reply, sas_iounit_pg1,
            sz)) {
                if (dmd & MPI2_SASIOUNIT1_REPORT_MISSING_UNIT_16)
                        dmd_new = (dmd &
                            MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK) * 16;
                else
                        dmd_new =
                    dmd & MPI2_SASIOUNIT1_REPORT_MISSING_TIMEOUT_MASK;
                pr_info(MPT3SAS_FMT "device_missing_delay: old(%d), new(%d)\n",
                        ioc->name, dmd_orignal, dmd_new);
                pr_info(MPT3SAS_FMT "ioc_missing_delay: old(%d), new(%d)\n",
                        ioc->name, io_missing_delay_original,
                    io_missing_delay);
                ioc->device_missing_delay = dmd_new;
                ioc->io_missing_delay = io_missing_delay;
        }

out:
        kfree(sas_iounit_pg1);
}
/**
 * _base_static_config_pages - static start of day config pages
 * @ioc: per adapter object
 *
 * Return nothing.
 */
static void
_base_static_config_pages(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2ConfigReply_t mpi_reply;
        u32 iounit_pg1_flags;

        mpt3sas_config_get_manufacturing_pg0(ioc, &mpi_reply, &ioc->manu_pg0);
        if (ioc->ir_firmware)
                mpt3sas_config_get_manufacturing_pg10(ioc, &mpi_reply,
                    &ioc->manu_pg10);

        /*
         * Ensure correct T10 PI operation if vendor left EEDPTagMode
         * flag unset in NVDATA.
         */
        mpt3sas_config_get_manufacturing_pg11(ioc, &mpi_reply, &ioc->manu_pg11);
        if (ioc->manu_pg11.EEDPTagMode == 0) {
                pr_err("%s: overriding NVDATA EEDPTagMode setting\n",
                    ioc->name);
                ioc->manu_pg11.EEDPTagMode &= ~0x3;
                ioc->manu_pg11.EEDPTagMode |= 0x1;
                mpt3sas_config_set_manufacturing_pg11(ioc, &mpi_reply,
                    &ioc->manu_pg11);
        }

        mpt3sas_config_get_bios_pg2(ioc, &mpi_reply, &ioc->bios_pg2);
        mpt3sas_config_get_bios_pg3(ioc, &mpi_reply, &ioc->bios_pg3);
        mpt3sas_config_get_ioc_pg8(ioc, &mpi_reply, &ioc->ioc_pg8);
        mpt3sas_config_get_iounit_pg0(ioc, &mpi_reply, &ioc->iounit_pg0);
        mpt3sas_config_get_iounit_pg1(ioc, &mpi_reply, &ioc->iounit_pg1);
        mpt3sas_config_get_iounit_pg8(ioc, &mpi_reply, &ioc->iounit_pg8);
        _base_display_ioc_capabilities(ioc);

        /*
         * Enable task_set_full handling in iounit_pg1 when the
         * facts capabilities indicate that its supported.
         */
        iounit_pg1_flags = le32_to_cpu(ioc->iounit_pg1.Flags);
        if ((ioc->facts.IOCCapabilities &
            MPI2_IOCFACTS_CAPABILITY_TASK_SET_FULL_HANDLING))
                iounit_pg1_flags &=
                    ~MPI2_IOUNITPAGE1_DISABLE_TASK_SET_FULL_HANDLING;
        else
                iounit_pg1_flags |=
                    MPI2_IOUNITPAGE1_DISABLE_TASK_SET_FULL_HANDLING;
        ioc->iounit_pg1.Flags = cpu_to_le32(iounit_pg1_flags);
        mpt3sas_config_set_iounit_pg1(ioc, &mpi_reply, &ioc->iounit_pg1);

        if (ioc->iounit_pg8.NumSensors)
                ioc->temp_sensors_count = ioc->iounit_pg8.NumSensors;
}

/**
 * _base_release_memory_pools - release memory
 * @ioc: per adapter object
 *
 * Free memory allocated from _base_allocate_memory_pools.
 *
 * Return nothing.
 */
static void
_base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
{
        int i = 0;
        struct reply_post_struct *rps;

        dexitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        if (ioc->request) {
                pci_free_consistent(ioc->pdev, ioc->request_dma_sz,
                    ioc->request,  ioc->request_dma);
                dexitprintk(ioc, pr_info(MPT3SAS_FMT
                        "request_pool(0x%p): free\n",
                        ioc->name, ioc->request));
                ioc->request = NULL;
        }

        if (ioc->sense) {
                dma_pool_free(ioc->sense_dma_pool, ioc->sense, ioc->sense_dma);
                dma_pool_destroy(ioc->sense_dma_pool);
                dexitprintk(ioc, pr_info(MPT3SAS_FMT
                        "sense_pool(0x%p): free\n",
                        ioc->name, ioc->sense));
                ioc->sense = NULL;
        }

        if (ioc->reply) {
                dma_pool_free(ioc->reply_dma_pool, ioc->reply, ioc->reply_dma);
                dma_pool_destroy(ioc->reply_dma_pool);
                dexitprintk(ioc, pr_info(MPT3SAS_FMT
                        "reply_pool(0x%p): free\n",
                        ioc->name, ioc->reply));
                ioc->reply = NULL;
        }

        if (ioc->reply_free) {
                dma_pool_free(ioc->reply_free_dma_pool, ioc->reply_free,
                    ioc->reply_free_dma);
                dma_pool_destroy(ioc->reply_free_dma_pool);
                dexitprintk(ioc, pr_info(MPT3SAS_FMT
                        "reply_free_pool(0x%p): free\n",
                        ioc->name, ioc->reply_free));
                ioc->reply_free = NULL;
        }

        if (ioc->reply_post) {
                do {
                        rps = &ioc->reply_post[i];
                        if (rps->reply_post_free) {
                                dma_pool_free(
                                    ioc->reply_post_free_dma_pool,
                                    rps->reply_post_free,
                                    rps->reply_post_free_dma);
                                dexitprintk(ioc, pr_info(MPT3SAS_FMT
                                    "reply_post_free_pool(0x%p): free\n",
                                    ioc->name, rps->reply_post_free));
                                rps->reply_post_free = NULL;
                        }
                } while (ioc->rdpq_array_enable &&
                           (++i < ioc->reply_queue_count));

                dma_pool_destroy(ioc->reply_post_free_dma_pool);
                kfree(ioc->reply_post);
        }

        if (ioc->pcie_sgl_dma_pool) {
                for (i = 0; i < ioc->scsiio_depth; i++) {
                        dma_pool_free(ioc->pcie_sgl_dma_pool,
                                        ioc->pcie_sg_lookup[i].pcie_sgl,
                                        ioc->pcie_sg_lookup[i].pcie_sgl_dma);
                }
                if (ioc->pcie_sgl_dma_pool)
                        dma_pool_destroy(ioc->pcie_sgl_dma_pool);
        }

        if (ioc->config_page) {
                dexitprintk(ioc, pr_info(MPT3SAS_FMT
                    "config_page(0x%p): free\n", ioc->name,
                    ioc->config_page));
                pci_free_consistent(ioc->pdev, ioc->config_page_sz,
                    ioc->config_page, ioc->config_page_dma);
        }

        kfree(ioc->hpr_lookup);
        kfree(ioc->internal_lookup);
        if (ioc->chain_lookup) {
                for (i = 0; i < ioc->chain_depth; i++) {
                        if (ioc->chain_lookup[i].chain_buffer)
                                dma_pool_free(ioc->chain_dma_pool,
                                    ioc->chain_lookup[i].chain_buffer,
                                    ioc->chain_lookup[i].chain_buffer_dma);
                }
                dma_pool_destroy(ioc->chain_dma_pool);
                free_pages((ulong)ioc->chain_lookup, ioc->chain_pages);
                ioc->chain_lookup = NULL;
        }
}

/**
 * _base_allocate_memory_pools - allocate start of day memory pools
 * @ioc: per adapter object
 *
 * Returns 0 success, anything else error
 */
static int
_base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
{
        struct mpt3sas_facts *facts;
        u16 max_sge_elements;
        u16 chains_needed_per_io;
        u32 sz, total_sz, reply_post_free_sz;
        u32 retry_sz;
        u16 max_request_credit, nvme_blocks_needed;
        unsigned short sg_tablesize;
        u16 sge_size;
        int i;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));


        retry_sz = 0;
        facts = &ioc->facts;

        /* command line tunables for max sgl entries */
        if (max_sgl_entries != -1)
                sg_tablesize = max_sgl_entries;
        else {
                if (ioc->hba_mpi_version_belonged == MPI2_VERSION)
                        sg_tablesize = MPT2SAS_SG_DEPTH;
                else
                        sg_tablesize = MPT3SAS_SG_DEPTH;
        }

        /* max sgl entries <= MPT_KDUMP_MIN_PHYS_SEGMENTS in KDUMP mode */
        if (reset_devices)
                sg_tablesize = min_t(unsigned short, sg_tablesize,
                   MPT_KDUMP_MIN_PHYS_SEGMENTS);

        if (ioc->is_mcpu_endpoint)
                ioc->shost->sg_tablesize = MPT_MIN_PHYS_SEGMENTS;
        else {
                if (sg_tablesize < MPT_MIN_PHYS_SEGMENTS)
                        sg_tablesize = MPT_MIN_PHYS_SEGMENTS;
                else if (sg_tablesize > MPT_MAX_PHYS_SEGMENTS) {
                        sg_tablesize = min_t(unsigned short, sg_tablesize,
                                        SG_MAX_SEGMENTS);
                        pr_warn(MPT3SAS_FMT
                                "sg_tablesize(%u) is bigger than kernel "
                                "defined SG_CHUNK_SIZE(%u)\n", ioc->name,
                                sg_tablesize, MPT_MAX_PHYS_SEGMENTS);
                }
                ioc->shost->sg_tablesize = sg_tablesize;
        }

        ioc->internal_depth = min_t(int, (facts->HighPriorityCredit + (5)),
                (facts->RequestCredit / 4));
        if (ioc->internal_depth < INTERNAL_CMDS_COUNT) {
                if (facts->RequestCredit <= (INTERNAL_CMDS_COUNT +
                                INTERNAL_SCSIIO_CMDS_COUNT)) {
                        pr_err(MPT3SAS_FMT "IOC doesn't have enough Request \
                            Credits, it has just %d number of credits\n",
                            ioc->name, facts->RequestCredit);
                        return -ENOMEM;
                }
                ioc->internal_depth = 10;
        }

        ioc->hi_priority_depth = ioc->internal_depth - (5);
        /* command line tunables  for max controller queue depth */
        if (max_queue_depth != -1 && max_queue_depth != 0) {
                max_request_credit = min_t(u16, max_queue_depth +
                        ioc->internal_depth, facts->RequestCredit);
                if (max_request_credit > MAX_HBA_QUEUE_DEPTH)
                        max_request_credit =  MAX_HBA_QUEUE_DEPTH;
        } else if (reset_devices)
                max_request_credit = min_t(u16, facts->RequestCredit,
                    (MPT3SAS_KDUMP_SCSI_IO_DEPTH + ioc->internal_depth));
        else
                max_request_credit = min_t(u16, facts->RequestCredit,
                    MAX_HBA_QUEUE_DEPTH);

        /* Firmware maintains additional facts->HighPriorityCredit number of
         * credits for HiPriprity Request messages, so hba queue depth will be
         * sum of max_request_credit and high priority queue depth.
         */
        ioc->hba_queue_depth = max_request_credit + ioc->hi_priority_depth;

        /* request frame size */
        ioc->request_sz = facts->IOCRequestFrameSize * 4;

        /* reply frame size */
        ioc->reply_sz = facts->ReplyFrameSize * 4;

        /* chain segment size */
        if (ioc->hba_mpi_version_belonged != MPI2_VERSION) {
                if (facts->IOCMaxChainSegmentSize)
                        ioc->chain_segment_sz =
                                        facts->IOCMaxChainSegmentSize *
                                        MAX_CHAIN_ELEMT_SZ;
                else
                /* set to 128 bytes size if IOCMaxChainSegmentSize is zero */
                        ioc->chain_segment_sz = DEFAULT_NUM_FWCHAIN_ELEMTS *
                                                    MAX_CHAIN_ELEMT_SZ;
        } else
                ioc->chain_segment_sz = ioc->request_sz;

        /* calculate the max scatter element size */
        sge_size = max_t(u16, ioc->sge_size, ioc->sge_size_ieee);

 retry_allocation:
        total_sz = 0;
        /* calculate number of sg elements left over in the 1st frame */
        max_sge_elements = ioc->request_sz - ((sizeof(Mpi2SCSIIORequest_t) -
            sizeof(Mpi2SGEIOUnion_t)) + sge_size);
        ioc->max_sges_in_main_message = max_sge_elements/sge_size;

        /* now do the same for a chain buffer */
        max_sge_elements = ioc->chain_segment_sz - sge_size;
        ioc->max_sges_in_chain_message = max_sge_elements/sge_size;

        /*
         *  MPT3SAS_SG_DEPTH = CONFIG_FUSION_MAX_SGE
         */
        chains_needed_per_io = ((ioc->shost->sg_tablesize -
           ioc->max_sges_in_main_message)/ioc->max_sges_in_chain_message)
            + 1;
        if (chains_needed_per_io > facts->MaxChainDepth) {
                chains_needed_per_io = facts->MaxChainDepth;
                ioc->shost->sg_tablesize = min_t(u16,
                ioc->max_sges_in_main_message + (ioc->max_sges_in_chain_message
                * chains_needed_per_io), ioc->shost->sg_tablesize);
        }
        ioc->chains_needed_per_io = chains_needed_per_io;

        /* reply free queue sizing - taking into account for 64 FW events */
        ioc->reply_free_queue_depth = ioc->hba_queue_depth + 64;

        /* mCPU manage single counters for simplicity */
        if (ioc->is_mcpu_endpoint)
                ioc->reply_post_queue_depth = ioc->reply_free_queue_depth;
        else {
                /* calculate reply descriptor post queue depth */
                ioc->reply_post_queue_depth = ioc->hba_queue_depth +
                        ioc->reply_free_queue_depth +  1;
                /* align the reply post queue on the next 16 count boundary */
                if (ioc->reply_post_queue_depth % 16)
                        ioc->reply_post_queue_depth += 16 -
                                (ioc->reply_post_queue_depth % 16);
        }

        if (ioc->reply_post_queue_depth >
            facts->MaxReplyDescriptorPostQueueDepth) {
                ioc->reply_post_queue_depth =
                                facts->MaxReplyDescriptorPostQueueDepth -
                    (facts->MaxReplyDescriptorPostQueueDepth % 16);
                ioc->hba_queue_depth =
                                ((ioc->reply_post_queue_depth - 64) / 2) - 1;
                ioc->reply_free_queue_depth = ioc->hba_queue_depth + 64;
        }

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "scatter gather: " \
            "sge_in_main_msg(%d), sge_per_chain(%d), sge_per_io(%d), "
            "chains_per_io(%d)\n", ioc->name, ioc->max_sges_in_main_message,
            ioc->max_sges_in_chain_message, ioc->shost->sg_tablesize,
            ioc->chains_needed_per_io));

        /* reply post queue, 16 byte align */
        reply_post_free_sz = ioc->reply_post_queue_depth *
            sizeof(Mpi2DefaultReplyDescriptor_t);

        sz = reply_post_free_sz;
        if (_base_is_controller_msix_enabled(ioc) && !ioc->rdpq_array_enable)
                sz *= ioc->reply_queue_count;

        ioc->reply_post = kcalloc((ioc->rdpq_array_enable) ?
            (ioc->reply_queue_count):1,
            sizeof(struct reply_post_struct), GFP_KERNEL);

        if (!ioc->reply_post) {
                pr_err(MPT3SAS_FMT "reply_post_free pool: kcalloc failed\n",
                        ioc->name);
                goto out;
        }
        ioc->reply_post_free_dma_pool = dma_pool_create("reply_post_free pool",
            &ioc->pdev->dev, sz, 16, 0);
        if (!ioc->reply_post_free_dma_pool) {
                pr_err(MPT3SAS_FMT
                 "reply_post_free pool: dma_pool_create failed\n",
                 ioc->name);
                goto out;
        }
        i = 0;
        do {
                ioc->reply_post[i].reply_post_free =
                    dma_pool_alloc(ioc->reply_post_free_dma_pool,
                    GFP_KERNEL,
                    &ioc->reply_post[i].reply_post_free_dma);
                if (!ioc->reply_post[i].reply_post_free) {
                        pr_err(MPT3SAS_FMT
                        "reply_post_free pool: dma_pool_alloc failed\n",
                        ioc->name);
                        goto out;
                }
                memset(ioc->reply_post[i].reply_post_free, 0, sz);
                dinitprintk(ioc, pr_info(MPT3SAS_FMT
                    "reply post free pool (0x%p): depth(%d),"
                    "element_size(%d), pool_size(%d kB)\n", ioc->name,
                    ioc->reply_post[i].reply_post_free,
                    ioc->reply_post_queue_depth, 8, sz/1024));
                dinitprintk(ioc, pr_info(MPT3SAS_FMT
                    "reply_post_free_dma = (0x%llx)\n", ioc->name,
                    (unsigned long long)
                    ioc->reply_post[i].reply_post_free_dma));
                total_sz += sz;
        } while (ioc->rdpq_array_enable && (++i < ioc->reply_queue_count));

        if (ioc->dma_mask == 64) {
                if (_base_change_consistent_dma_mask(ioc, ioc->pdev) != 0) {
                        pr_warn(MPT3SAS_FMT
                            "no suitable consistent DMA mask for %s\n",
                            ioc->name, pci_name(ioc->pdev));
                        goto out;
                }
        }

        ioc->scsiio_depth = ioc->hba_queue_depth -
            ioc->hi_priority_depth - ioc->internal_depth;

        /* set the scsi host can_queue depth
         * with some internal commands that could be outstanding
         */
        ioc->shost->can_queue = ioc->scsiio_depth - INTERNAL_SCSIIO_CMDS_COUNT;
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "scsi host: can_queue depth (%d)\n",
                ioc->name, ioc->shost->can_queue));


        /* contiguous pool for request and chains, 16 byte align, one extra "
         * "frame for smid=0
         */
        ioc->chain_depth = ioc->chains_needed_per_io * ioc->scsiio_depth;
        sz = ((ioc->scsiio_depth + 1) * ioc->request_sz);

        /* hi-priority queue */
        sz += (ioc->hi_priority_depth * ioc->request_sz);

        /* internal queue */
        sz += (ioc->internal_depth * ioc->request_sz);

        ioc->request_dma_sz = sz;
        ioc->request = pci_alloc_consistent(ioc->pdev, sz, &ioc->request_dma);
        if (!ioc->request) {
                pr_err(MPT3SAS_FMT "request pool: pci_alloc_consistent " \
                    "failed: hba_depth(%d), chains_per_io(%d), frame_sz(%d), "
                    "total(%d kB)\n", ioc->name, ioc->hba_queue_depth,
                    ioc->chains_needed_per_io, ioc->request_sz, sz/1024);
                if (ioc->scsiio_depth < MPT3SAS_SAS_QUEUE_DEPTH)
                        goto out;
                retry_sz = 64;
                ioc->hba_queue_depth -= retry_sz;
                _base_release_memory_pools(ioc);
                goto retry_allocation;
        }

        if (retry_sz)
                pr_err(MPT3SAS_FMT "request pool: pci_alloc_consistent " \
                    "succeed: hba_depth(%d), chains_per_io(%d), frame_sz(%d), "
                    "total(%d kb)\n", ioc->name, ioc->hba_queue_depth,
                    ioc->chains_needed_per_io, ioc->request_sz, sz/1024);

        /* hi-priority queue */
        ioc->hi_priority = ioc->request + ((ioc->scsiio_depth + 1) *
            ioc->request_sz);
        ioc->hi_priority_dma = ioc->request_dma + ((ioc->scsiio_depth + 1) *
            ioc->request_sz);

        /* internal queue */
        ioc->internal = ioc->hi_priority + (ioc->hi_priority_depth *
            ioc->request_sz);
        ioc->internal_dma = ioc->hi_priority_dma + (ioc->hi_priority_depth *
            ioc->request_sz);

        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "request pool(0x%p): depth(%d), frame_size(%d), pool_size(%d kB)\n",
                ioc->name, ioc->request, ioc->hba_queue_depth, ioc->request_sz,
            (ioc->hba_queue_depth * ioc->request_sz)/1024));

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "request pool: dma(0x%llx)\n",
            ioc->name, (unsigned long long) ioc->request_dma));
        total_sz += sz;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "scsiio(0x%p): depth(%d)\n",
                ioc->name, ioc->request, ioc->scsiio_depth));

        ioc->chain_depth = min_t(u32, ioc->chain_depth, MAX_CHAIN_DEPTH);
        sz = ioc->chain_depth * sizeof(struct chain_tracker);
        ioc->chain_pages = get_order(sz);
        ioc->chain_lookup = (struct chain_tracker *)__get_free_pages(
            GFP_KERNEL, ioc->chain_pages);
        if (!ioc->chain_lookup) {
                pr_err(MPT3SAS_FMT "chain_lookup: __get_free_pages failed\n",
                        ioc->name);
                goto out;
        }
        ioc->chain_dma_pool = dma_pool_create("chain pool", &ioc->pdev->dev,
            ioc->chain_segment_sz, 16, 0);
        if (!ioc->chain_dma_pool) {
                pr_err(MPT3SAS_FMT "chain_dma_pool: dma_pool_create failed\n",
                        ioc->name);
                goto out;
        }
        for (i = 0; i < ioc->chain_depth; i++) {
                ioc->chain_lookup[i].chain_buffer = dma_pool_alloc(
                    ioc->chain_dma_pool , GFP_KERNEL,
                    &ioc->chain_lookup[i].chain_buffer_dma);
                if (!ioc->chain_lookup[i].chain_buffer) {
                        ioc->chain_depth = i;
                        goto chain_done;
                }
                total_sz += ioc->chain_segment_sz;
        }
 chain_done:
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "chain pool depth(%d), frame_size(%d), pool_size(%d kB)\n",
                ioc->name, ioc->chain_depth, ioc->chain_segment_sz,
                ((ioc->chain_depth *  ioc->chain_segment_sz))/1024));

        /* initialize hi-priority queue smid's */
        ioc->hpr_lookup = kcalloc(ioc->hi_priority_depth,
            sizeof(struct request_tracker), GFP_KERNEL);
        if (!ioc->hpr_lookup) {
                pr_err(MPT3SAS_FMT "hpr_lookup: kcalloc failed\n",
                    ioc->name);
                goto out;
        }
        ioc->hi_priority_smid = ioc->scsiio_depth + 1;
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "hi_priority(0x%p): depth(%d), start smid(%d)\n",
                ioc->name, ioc->hi_priority,
            ioc->hi_priority_depth, ioc->hi_priority_smid));

        /* initialize internal queue smid's */
        ioc->internal_lookup = kcalloc(ioc->internal_depth,
            sizeof(struct request_tracker), GFP_KERNEL);
        if (!ioc->internal_lookup) {
                pr_err(MPT3SAS_FMT "internal_lookup: kcalloc failed\n",
                    ioc->name);
                goto out;
        }
        ioc->internal_smid = ioc->hi_priority_smid + ioc->hi_priority_depth;
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "internal(0x%p): depth(%d), start smid(%d)\n",
                ioc->name, ioc->internal,
            ioc->internal_depth, ioc->internal_smid));
        /*
         * The number of NVMe page sized blocks needed is:
         *     (((sg_tablesize * 8) - 1) / (page_size - 8)) + 1
         * ((sg_tablesize * 8) - 1) is the max PRP's minus the first PRP entry
         * that is placed in the main message frame.  8 is the size of each PRP
         * entry or PRP list pointer entry.  8 is subtracted from page_size
         * because of the PRP list pointer entry at the end of a page, so this
         * is not counted as a PRP entry.  The 1 added page is a round up.
         *
         * To avoid allocation failures due to the amount of memory that could
         * be required for NVMe PRP's, only each set of NVMe blocks will be
         * contiguous, so a new set is allocated for each possible I/O.
         */
        if (ioc->facts.ProtocolFlags & MPI2_IOCFACTS_PROTOCOL_NVME_DEVICES) {
                nvme_blocks_needed =
                        (ioc->shost->sg_tablesize * NVME_PRP_SIZE) - 1;
                nvme_blocks_needed /= (ioc->page_size - NVME_PRP_SIZE);
                nvme_blocks_needed++;

                sz = sizeof(struct pcie_sg_list) * ioc->scsiio_depth;
                ioc->pcie_sg_lookup = kzalloc(sz, GFP_KERNEL);
                if (!ioc->pcie_sg_lookup) {
                        pr_info(MPT3SAS_FMT
                            "PCIe SGL lookup: kzalloc failed\n", ioc->name);
                        goto out;
                }
                sz = nvme_blocks_needed * ioc->page_size;
                ioc->pcie_sgl_dma_pool =
                        dma_pool_create("PCIe SGL pool", &ioc->pdev->dev, sz, 16, 0);
                if (!ioc->pcie_sgl_dma_pool) {
                        pr_info(MPT3SAS_FMT
                            "PCIe SGL pool: dma_pool_create failed\n",
                            ioc->name);
                        goto out;
                }
                for (i = 0; i < ioc->scsiio_depth; i++) {
                        ioc->pcie_sg_lookup[i].pcie_sgl = dma_pool_alloc(
                                ioc->pcie_sgl_dma_pool, GFP_KERNEL,
                                &ioc->pcie_sg_lookup[i].pcie_sgl_dma);
                        if (!ioc->pcie_sg_lookup[i].pcie_sgl) {
                                pr_info(MPT3SAS_FMT
                                    "PCIe SGL pool: dma_pool_alloc failed\n",
                                    ioc->name);
                                goto out;
                        }
                }

                dinitprintk(ioc, pr_info(MPT3SAS_FMT "PCIe sgl pool depth(%d), "
                        "element_size(%d), pool_size(%d kB)\n", ioc->name,
                        ioc->scsiio_depth, sz, (sz * ioc->scsiio_depth)/1024));
                total_sz += sz * ioc->scsiio_depth;
        }
        /* sense buffers, 4 byte align */
        sz = ioc->scsiio_depth * SCSI_SENSE_BUFFERSIZE;
        ioc->sense_dma_pool = dma_pool_create("sense pool", &ioc->pdev->dev, sz,
                                              4, 0);
        if (!ioc->sense_dma_pool) {
                pr_err(MPT3SAS_FMT "sense pool: dma_pool_create failed\n",
                    ioc->name);
                goto out;
        }
        ioc->sense = dma_pool_alloc(ioc->sense_dma_pool, GFP_KERNEL,
            &ioc->sense_dma);
        if (!ioc->sense) {
                pr_err(MPT3SAS_FMT "sense pool: dma_pool_alloc failed\n",
                    ioc->name);
                goto out;
        }
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
            "sense pool(0x%p): depth(%d), element_size(%d), pool_size"
            "(%d kB)\n", ioc->name, ioc->sense, ioc->scsiio_depth,
            SCSI_SENSE_BUFFERSIZE, sz/1024));
        dinitprintk(ioc, pr_info(MPT3SAS_FMT "sense_dma(0x%llx)\n",
            ioc->name, (unsigned long long)ioc->sense_dma));
        total_sz += sz;

        /* reply pool, 4 byte align */
        sz = ioc->reply_free_queue_depth * ioc->reply_sz;
        ioc->reply_dma_pool = dma_pool_create("reply pool", &ioc->pdev->dev, sz,
                                              4, 0);
        if (!ioc->reply_dma_pool) {
                pr_err(MPT3SAS_FMT "reply pool: dma_pool_create failed\n",
                    ioc->name);
                goto out;
        }
        ioc->reply = dma_pool_alloc(ioc->reply_dma_pool, GFP_KERNEL,
            &ioc->reply_dma);
        if (!ioc->reply) {
                pr_err(MPT3SAS_FMT "reply pool: dma_pool_alloc failed\n",
                    ioc->name);
                goto out;
        }
        ioc->reply_dma_min_address = (u32)(ioc->reply_dma);
        ioc->reply_dma_max_address = (u32)(ioc->reply_dma) + sz;
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "reply pool(0x%p): depth(%d), frame_size(%d), pool_size(%d kB)\n",
                ioc->name, ioc->reply,
            ioc->reply_free_queue_depth, ioc->reply_sz, sz/1024));
        dinitprintk(ioc, pr_info(MPT3SAS_FMT "reply_dma(0x%llx)\n",
            ioc->name, (unsigned long long)ioc->reply_dma));
        total_sz += sz;

        /* reply free queue, 16 byte align */
        sz = ioc->reply_free_queue_depth * 4;
        ioc->reply_free_dma_pool = dma_pool_create("reply_free pool",
            &ioc->pdev->dev, sz, 16, 0);
        if (!ioc->reply_free_dma_pool) {
                pr_err(MPT3SAS_FMT "reply_free pool: dma_pool_create failed\n",
                        ioc->name);
                goto out;
        }
        ioc->reply_free = dma_pool_alloc(ioc->reply_free_dma_pool, GFP_KERNEL,
            &ioc->reply_free_dma);
        if (!ioc->reply_free) {
                pr_err(MPT3SAS_FMT "reply_free pool: dma_pool_alloc failed\n",
                        ioc->name);
                goto out;
        }
        memset(ioc->reply_free, 0, sz);
        dinitprintk(ioc, pr_info(MPT3SAS_FMT "reply_free pool(0x%p): " \
            "depth(%d), element_size(%d), pool_size(%d kB)\n", ioc->name,
            ioc->reply_free, ioc->reply_free_queue_depth, 4, sz/1024));
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "reply_free_dma (0x%llx)\n",
                ioc->name, (unsigned long long)ioc->reply_free_dma));
        total_sz += sz;

        ioc->config_page_sz = 512;
        ioc->config_page = pci_alloc_consistent(ioc->pdev,
            ioc->config_page_sz, &ioc->config_page_dma);
        if (!ioc->config_page) {
                pr_err(MPT3SAS_FMT
                        "config page: dma_pool_alloc failed\n",
                        ioc->name);
                goto out;
        }
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "config page(0x%p): size(%d)\n",
                ioc->name, ioc->config_page, ioc->config_page_sz));
        dinitprintk(ioc, pr_info(MPT3SAS_FMT "config_page_dma(0x%llx)\n",
                ioc->name, (unsigned long long)ioc->config_page_dma));
        total_sz += ioc->config_page_sz;

        pr_info(MPT3SAS_FMT "Allocated physical memory: size(%d kB)\n",
            ioc->name, total_sz/1024);
        pr_info(MPT3SAS_FMT
                "Current Controller Queue Depth(%d),Max Controller Queue Depth(%d)\n",
            ioc->name, ioc->shost->can_queue, facts->RequestCredit);
        pr_info(MPT3SAS_FMT "Scatter Gather Elements per IO(%d)\n",
            ioc->name, ioc->shost->sg_tablesize);
        return 0;

 out:
        return -ENOMEM;
}

/**
 * mpt3sas_base_get_iocstate - Get the current state of a MPT adapter.
 * @ioc: Pointer to MPT_ADAPTER structure
 * @cooked: Request raw or cooked IOC state
 *
 * Returns all IOC Doorbell register bits if cooked==0, else just the
 * Doorbell bits in MPI_IOC_STATE_MASK.
 */
u32
mpt3sas_base_get_iocstate(struct MPT3SAS_ADAPTER *ioc, int cooked)
{
        u32 s, sc;

        s = readl(&ioc->chip->Doorbell);
        sc = s & MPI2_IOC_STATE_MASK;
        return cooked ? sc : s;
}

/**
 * _base_wait_on_iocstate - waiting on a particular ioc state
 * @ioc_state: controller state { READY, OPERATIONAL, or RESET }
 * @timeout: timeout in second
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_wait_on_iocstate(struct MPT3SAS_ADAPTER *ioc, u32 ioc_state, int timeout)
{
        u32 count, cntdn;
        u32 current_state;

        count = 0;
        cntdn = 1000 * timeout;
        do {
                current_state = mpt3sas_base_get_iocstate(ioc, 1);
                if (current_state == ioc_state)
                        return 0;
                if (count && current_state == MPI2_IOC_STATE_FAULT)
                        break;

                usleep_range(1000, 1500);
                count++;
        } while (--cntdn);

        return current_state;
}

/**
 * _base_wait_for_doorbell_int - waiting for controller interrupt(generated by
 * a write to the doorbell)
 * @ioc: per adapter object
 * @timeout: timeout in second
 *
 * Returns 0 for success, non-zero for failure.
 *
 * Notes: MPI2_HIS_IOC2SYS_DB_STATUS - set to one when IOC writes to doorbell.
 */
static int
_base_diag_reset(struct MPT3SAS_ADAPTER *ioc);

static int
_base_wait_for_doorbell_int(struct MPT3SAS_ADAPTER *ioc, int timeout)
{
        u32 cntdn, count;
        u32 int_status;

        count = 0;
        cntdn = 1000 * timeout;
        do {
                int_status = readl(&ioc->chip->HostInterruptStatus);
                if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
                        dhsprintk(ioc, pr_info(MPT3SAS_FMT
                                "%s: successful count(%d), timeout(%d)\n",
                                ioc->name, __func__, count, timeout));
                        return 0;
                }

                usleep_range(1000, 1500);
                count++;
        } while (--cntdn);

        pr_err(MPT3SAS_FMT
                "%s: failed due to timeout count(%d), int_status(%x)!\n",
                ioc->name, __func__, count, int_status);
        return -EFAULT;
}

static int
_base_spin_on_doorbell_int(struct MPT3SAS_ADAPTER *ioc, int timeout)
{
        u32 cntdn, count;
        u32 int_status;

        count = 0;
        cntdn = 2000 * timeout;
        do {
                int_status = readl(&ioc->chip->HostInterruptStatus);
                if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
                        dhsprintk(ioc, pr_info(MPT3SAS_FMT
                                "%s: successful count(%d), timeout(%d)\n",
                                ioc->name, __func__, count, timeout));
                        return 0;
                }

                udelay(500);
                count++;
        } while (--cntdn);

        pr_err(MPT3SAS_FMT
                "%s: failed due to timeout count(%d), int_status(%x)!\n",
                ioc->name, __func__, count, int_status);
        return -EFAULT;

}

/**
 * _base_wait_for_doorbell_ack - waiting for controller to read the doorbell.
 * @ioc: per adapter object
 * @timeout: timeout in second
 *
 * Returns 0 for success, non-zero for failure.
 *
 * Notes: MPI2_HIS_SYS2IOC_DB_STATUS - set to one when host writes to
 * doorbell.
 */
static int
_base_wait_for_doorbell_ack(struct MPT3SAS_ADAPTER *ioc, int timeout)
{
        u32 cntdn, count;
        u32 int_status;
        u32 doorbell;

        count = 0;
        cntdn = 1000 * timeout;
        do {
                int_status = readl(&ioc->chip->HostInterruptStatus);
                if (!(int_status & MPI2_HIS_SYS2IOC_DB_STATUS)) {
                        dhsprintk(ioc, pr_info(MPT3SAS_FMT
                                "%s: successful count(%d), timeout(%d)\n",
                                ioc->name, __func__, count, timeout));
                        return 0;
                } else if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
                        doorbell = readl(&ioc->chip->Doorbell);
                        if ((doorbell & MPI2_IOC_STATE_MASK) ==
                            MPI2_IOC_STATE_FAULT) {
                                mpt3sas_base_fault_info(ioc , doorbell);
                                return -EFAULT;
                        }
                } else if (int_status == 0xFFFFFFFF)
                        goto out;

                usleep_range(1000, 1500);
                count++;
        } while (--cntdn);

 out:
        pr_err(MPT3SAS_FMT
         "%s: failed due to timeout count(%d), int_status(%x)!\n",
         ioc->name, __func__, count, int_status);
        return -EFAULT;
}

/**
 * _base_wait_for_doorbell_not_used - waiting for doorbell to not be in use
 * @ioc: per adapter object
 * @timeout: timeout in second
 *
 * Returns 0 for success, non-zero for failure.
 *
 */
static int
_base_wait_for_doorbell_not_used(struct MPT3SAS_ADAPTER *ioc, int timeout)
{
        u32 cntdn, count;
        u32 doorbell_reg;

        count = 0;
        cntdn = 1000 * timeout;
        do {
                doorbell_reg = readl(&ioc->chip->Doorbell);
                if (!(doorbell_reg & MPI2_DOORBELL_USED)) {
                        dhsprintk(ioc, pr_info(MPT3SAS_FMT
                                "%s: successful count(%d), timeout(%d)\n",
                                ioc->name, __func__, count, timeout));
                        return 0;
                }

                usleep_range(1000, 1500);
                count++;
        } while (--cntdn);

        pr_err(MPT3SAS_FMT
                "%s: failed due to timeout count(%d), doorbell_reg(%x)!\n",
                ioc->name, __func__, count, doorbell_reg);
        return -EFAULT;
}

/**
 * _base_send_ioc_reset - send doorbell reset
 * @ioc: per adapter object
 * @reset_type: currently only supports: MPI2_FUNCTION_IOC_MESSAGE_UNIT_RESET
 * @timeout: timeout in second
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_send_ioc_reset(struct MPT3SAS_ADAPTER *ioc, u8 reset_type, int timeout)
{
        u32 ioc_state;
        int r = 0;

        if (reset_type != MPI2_FUNCTION_IOC_MESSAGE_UNIT_RESET) {
                pr_err(MPT3SAS_FMT "%s: unknown reset_type\n",
                    ioc->name, __func__);
                return -EFAULT;
        }

        if (!(ioc->facts.IOCCapabilities &
           MPI2_IOCFACTS_CAPABILITY_EVENT_REPLAY))
                return -EFAULT;

        pr_info(MPT3SAS_FMT "sending message unit reset !!\n", ioc->name);

        writel(reset_type << MPI2_DOORBELL_FUNCTION_SHIFT,
            &ioc->chip->Doorbell);
        if ((_base_wait_for_doorbell_ack(ioc, 15))) {
                r = -EFAULT;
                goto out;
        }
        ioc_state = _base_wait_on_iocstate(ioc, MPI2_IOC_STATE_READY, timeout);
        if (ioc_state) {
                pr_err(MPT3SAS_FMT
                        "%s: failed going to ready state (ioc_state=0x%x)\n",
                        ioc->name, __func__, ioc_state);
                r = -EFAULT;
                goto out;
        }
 out:
        pr_info(MPT3SAS_FMT "message unit reset: %s\n",
            ioc->name, ((r == 0) ? "SUCCESS" : "FAILED"));
        return r;
}

/**
 * _base_handshake_req_reply_wait - send request thru doorbell interface
 * @ioc: per adapter object
 * @request_bytes: request length
 * @request: pointer having request payload
 * @reply_bytes: reply length
 * @reply: pointer to reply payload
 * @timeout: timeout in second
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_handshake_req_reply_wait(struct MPT3SAS_ADAPTER *ioc, int request_bytes,
        u32 *request, int reply_bytes, u16 *reply, int timeout)
{
        MPI2DefaultReply_t *default_reply = (MPI2DefaultReply_t *)reply;
        int i;
        u8 failed;
        __le32 *mfp;

        /* make sure doorbell is not in use */
        if ((readl(&ioc->chip->Doorbell) & MPI2_DOORBELL_USED)) {
                pr_err(MPT3SAS_FMT
                        "doorbell is in use (line=%d)\n",
                        ioc->name, __LINE__);
                return -EFAULT;
        }

        /* clear pending doorbell interrupts from previous state changes */
        if (readl(&ioc->chip->HostInterruptStatus) &
            MPI2_HIS_IOC2SYS_DB_STATUS)
                writel(0, &ioc->chip->HostInterruptStatus);

        /* send message to ioc */
        writel(((MPI2_FUNCTION_HANDSHAKE<<MPI2_DOORBELL_FUNCTION_SHIFT) |
            ((request_bytes/4)<<MPI2_DOORBELL_ADD_DWORDS_SHIFT)),
            &ioc->chip->Doorbell);

        if ((_base_spin_on_doorbell_int(ioc, 5))) {
                pr_err(MPT3SAS_FMT
                        "doorbell handshake int failed (line=%d)\n",
                        ioc->name, __LINE__);
                return -EFAULT;
        }
        writel(0, &ioc->chip->HostInterruptStatus);

        if ((_base_wait_for_doorbell_ack(ioc, 5))) {
                pr_err(MPT3SAS_FMT
                        "doorbell handshake ack failed (line=%d)\n",
                        ioc->name, __LINE__);
                return -EFAULT;
        }

        /* send message 32-bits at a time */
        for (i = 0, failed = 0; i < request_bytes/4 && !failed; i++) {
                writel(cpu_to_le32(request[i]), &ioc->chip->Doorbell);
                if ((_base_wait_for_doorbell_ack(ioc, 5)))
                        failed = 1;
        }

        if (failed) {
                pr_err(MPT3SAS_FMT
                        "doorbell handshake sending request failed (line=%d)\n",
                        ioc->name, __LINE__);
                return -EFAULT;
        }

        /* now wait for the reply */
        if ((_base_wait_for_doorbell_int(ioc, timeout))) {
                pr_err(MPT3SAS_FMT
                        "doorbell handshake int failed (line=%d)\n",
                        ioc->name, __LINE__);
                return -EFAULT;
        }

        /* read the first two 16-bits, it gives the total length of the reply */
        reply[0] = le16_to_cpu(readl(&ioc->chip->Doorbell)
            & MPI2_DOORBELL_DATA_MASK);
        writel(0, &ioc->chip->HostInterruptStatus);
        if ((_base_wait_for_doorbell_int(ioc, 5))) {
                pr_err(MPT3SAS_FMT
                        "doorbell handshake int failed (line=%d)\n",
                        ioc->name, __LINE__);
                return -EFAULT;
        }
        reply[1] = le16_to_cpu(readl(&ioc->chip->Doorbell)
            & MPI2_DOORBELL_DATA_MASK);
        writel(0, &ioc->chip->HostInterruptStatus);

        for (i = 2; i < default_reply->MsgLength * 2; i++)  {
                if ((_base_wait_for_doorbell_int(ioc, 5))) {
                        pr_err(MPT3SAS_FMT
                                "doorbell handshake int failed (line=%d)\n",
                                ioc->name, __LINE__);
                        return -EFAULT;
                }
                if (i >=  reply_bytes/2) /* overflow case */
                        readl(&ioc->chip->Doorbell);
                else
                        reply[i] = le16_to_cpu(readl(&ioc->chip->Doorbell)
                            & MPI2_DOORBELL_DATA_MASK);
                writel(0, &ioc->chip->HostInterruptStatus);
        }

        _base_wait_for_doorbell_int(ioc, 5);
        if (_base_wait_for_doorbell_not_used(ioc, 5) != 0) {
                dhsprintk(ioc, pr_info(MPT3SAS_FMT
                        "doorbell is in use (line=%d)\n", ioc->name, __LINE__));
        }
        writel(0, &ioc->chip->HostInterruptStatus);

        if (ioc->logging_level & MPT_DEBUG_INIT) {
                mfp = (__le32 *)reply;
                pr_info("\toffset:data\n");
                for (i = 0; i < reply_bytes/4; i++)
                        pr_info("\t[0x%02x]:%08x\n", i*4,
                            le32_to_cpu(mfp[i]));
        }
        return 0;
}

/**
 * mpt3sas_base_sas_iounit_control - send sas iounit control to FW
 * @ioc: per adapter object
 * @mpi_reply: the reply payload from FW
 * @mpi_request: the request payload sent to FW
 *
 * The SAS IO Unit Control Request message allows the host to perform low-level
 * operations, such as resets on the PHYs of the IO Unit, also allows the host
 * to obtain the IOC assigned device handles for a device if it has other
 * identifying information about the device, in addition allows the host to
 * remove IOC resources associated with the device.
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_base_sas_iounit_control(struct MPT3SAS_ADAPTER *ioc,
        Mpi2SasIoUnitControlReply_t *mpi_reply,
        Mpi2SasIoUnitControlRequest_t *mpi_request)
{
        u16 smid;
        u32 ioc_state;
        bool issue_reset = false;
        int rc;
        void *request;
        u16 wait_state_count;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        mutex_lock(&ioc->base_cmds.mutex);

        if (ioc->base_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: base_cmd in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        wait_state_count = 0;
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        pr_err(MPT3SAS_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
                pr_info(MPT3SAS_FMT
                        "%s: waiting for operational state(count=%d)\n",
                        ioc->name, __func__, wait_state_count);
        }

        smid = mpt3sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        rc = 0;
        ioc->base_cmds.status = MPT3_CMD_PENDING;
        request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->base_cmds.smid = smid;
        memcpy(request, mpi_request, sizeof(Mpi2SasIoUnitControlRequest_t));
        if (mpi_request->Operation == MPI2_SAS_OP_PHY_HARD_RESET ||
            mpi_request->Operation == MPI2_SAS_OP_PHY_LINK_RESET)
                ioc->ioc_link_reset_in_progress = 1;
        init_completion(&ioc->base_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        wait_for_completion_timeout(&ioc->base_cmds.done,
            msecs_to_jiffies(10000));
        if ((mpi_request->Operation == MPI2_SAS_OP_PHY_HARD_RESET ||
            mpi_request->Operation == MPI2_SAS_OP_PHY_LINK_RESET) &&
            ioc->ioc_link_reset_in_progress)
                ioc->ioc_link_reset_in_progress = 0;
        if (!(ioc->base_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SasIoUnitControlRequest_t)/4);
                if (!(ioc->base_cmds.status & MPT3_CMD_RESET))
                        issue_reset = true;
                goto issue_host_reset;
        }
        if (ioc->base_cmds.status & MPT3_CMD_REPLY_VALID)
                memcpy(mpi_reply, ioc->base_cmds.reply,
                    sizeof(Mpi2SasIoUnitControlReply_t));
        else
                memset(mpi_reply, 0, sizeof(Mpi2SasIoUnitControlReply_t));
        ioc->base_cmds.status = MPT3_CMD_NOT_USED;
        goto out;

 issue_host_reset:
        if (issue_reset)
                mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
        ioc->base_cmds.status = MPT3_CMD_NOT_USED;
        rc = -EFAULT;
 out:
        mutex_unlock(&ioc->base_cmds.mutex);
        return rc;
}

/**
 * mpt3sas_base_scsi_enclosure_processor - sending request to sep device
 * @ioc: per adapter object
 * @mpi_reply: the reply payload from FW
 * @mpi_request: the request payload sent to FW
 *
 * The SCSI Enclosure Processor request message causes the IOC to
 * communicate with SES devices to control LED status signals.
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_base_scsi_enclosure_processor(struct MPT3SAS_ADAPTER *ioc,
        Mpi2SepReply_t *mpi_reply, Mpi2SepRequest_t *mpi_request)
{
        u16 smid;
        u32 ioc_state;
        bool issue_reset = false;
        int rc;
        void *request;
        u16 wait_state_count;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        mutex_lock(&ioc->base_cmds.mutex);

        if (ioc->base_cmds.status != MPT3_CMD_NOT_USED) {
                pr_err(MPT3SAS_FMT "%s: base_cmd in use\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        wait_state_count = 0;
        ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
        while (ioc_state != MPI2_IOC_STATE_OPERATIONAL) {
                if (wait_state_count++ == 10) {
                        pr_err(MPT3SAS_FMT
                            "%s: failed due to ioc not operational\n",
                            ioc->name, __func__);
                        rc = -EFAULT;
                        goto out;
                }
                ssleep(1);
                ioc_state = mpt3sas_base_get_iocstate(ioc, 1);
                pr_info(MPT3SAS_FMT
                        "%s: waiting for operational state(count=%d)\n",
                        ioc->name,
                    __func__, wait_state_count);
        }

        smid = mpt3sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                rc = -EAGAIN;
                goto out;
        }

        rc = 0;
        ioc->base_cmds.status = MPT3_CMD_PENDING;
        request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->base_cmds.smid = smid;
        memcpy(request, mpi_request, sizeof(Mpi2SepReply_t));
        init_completion(&ioc->base_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        wait_for_completion_timeout(&ioc->base_cmds.done,
            msecs_to_jiffies(10000));
        if (!(ioc->base_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2SepRequest_t)/4);
                if (!(ioc->base_cmds.status & MPT3_CMD_RESET))
                        issue_reset = false;
                goto issue_host_reset;
        }
        if (ioc->base_cmds.status & MPT3_CMD_REPLY_VALID)
                memcpy(mpi_reply, ioc->base_cmds.reply,
                    sizeof(Mpi2SepReply_t));
        else
                memset(mpi_reply, 0, sizeof(Mpi2SepReply_t));
        ioc->base_cmds.status = MPT3_CMD_NOT_USED;
        goto out;

 issue_host_reset:
        if (issue_reset)
                mpt3sas_base_hard_reset_handler(ioc, FORCE_BIG_HAMMER);
        ioc->base_cmds.status = MPT3_CMD_NOT_USED;
        rc = -EFAULT;
 out:
        mutex_unlock(&ioc->base_cmds.mutex);
        return rc;
}

/**
 * _base_get_port_facts - obtain port facts reply and save in ioc
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_get_port_facts(struct MPT3SAS_ADAPTER *ioc, int port)
{
        Mpi2PortFactsRequest_t mpi_request;
        Mpi2PortFactsReply_t mpi_reply;
        struct mpt3sas_port_facts *pfacts;
        int mpi_reply_sz, mpi_request_sz, r;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        mpi_reply_sz = sizeof(Mpi2PortFactsReply_t);
        mpi_request_sz = sizeof(Mpi2PortFactsRequest_t);
        memset(&mpi_request, 0, mpi_request_sz);
        mpi_request.Function = MPI2_FUNCTION_PORT_FACTS;
        mpi_request.PortNumber = port;
        r = _base_handshake_req_reply_wait(ioc, mpi_request_sz,
            (u32 *)&mpi_request, mpi_reply_sz, (u16 *)&mpi_reply, 5);

        if (r != 0) {
                pr_err(MPT3SAS_FMT "%s: handshake failed (r=%d)\n",
                    ioc->name, __func__, r);
                return r;
        }

        pfacts = &ioc->pfacts[port];
        memset(pfacts, 0, sizeof(struct mpt3sas_port_facts));
        pfacts->PortNumber = mpi_reply.PortNumber;
        pfacts->VP_ID = mpi_reply.VP_ID;
        pfacts->VF_ID = mpi_reply.VF_ID;
        pfacts->MaxPostedCmdBuffers =
            le16_to_cpu(mpi_reply.MaxPostedCmdBuffers);

        return 0;
}

/**
 * _base_wait_for_iocstate - Wait until the card is in READY or OPERATIONAL
 * @ioc: per adapter object
 * @timeout:
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_wait_for_iocstate(struct MPT3SAS_ADAPTER *ioc, int timeout)
{
        u32 ioc_state;
        int rc;

        dinitprintk(ioc, printk(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        if (ioc->pci_error_recovery) {
                dfailprintk(ioc, printk(MPT3SAS_FMT
                    "%s: host in pci error recovery\n", ioc->name, __func__));
                return -EFAULT;
        }

        ioc_state = mpt3sas_base_get_iocstate(ioc, 0);
        dhsprintk(ioc, printk(MPT3SAS_FMT "%s: ioc_state(0x%08x)\n",
            ioc->name, __func__, ioc_state));

        if (((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_READY) ||
            (ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_OPERATIONAL)
                return 0;

        if (ioc_state & MPI2_DOORBELL_USED) {
                dhsprintk(ioc, printk(MPT3SAS_FMT
                    "unexpected doorbell active!\n", ioc->name));
                goto issue_diag_reset;
        }

        if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
                mpt3sas_base_fault_info(ioc, ioc_state &
                    MPI2_DOORBELL_DATA_MASK);
                goto issue_diag_reset;
        }

        ioc_state = _base_wait_on_iocstate(ioc, MPI2_IOC_STATE_READY, timeout);
        if (ioc_state) {
                dfailprintk(ioc, printk(MPT3SAS_FMT
                    "%s: failed going to ready state (ioc_state=0x%x)\n",
                    ioc->name, __func__, ioc_state));
                return -EFAULT;
        }

 issue_diag_reset:
        rc = _base_diag_reset(ioc);
        return rc;
}

/**
 * _base_get_ioc_facts - obtain ioc facts reply and save in ioc
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_get_ioc_facts(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2IOCFactsRequest_t mpi_request;
        Mpi2IOCFactsReply_t mpi_reply;
        struct mpt3sas_facts *facts;
        int mpi_reply_sz, mpi_request_sz, r;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        r = _base_wait_for_iocstate(ioc, 10);
        if (r) {
                dfailprintk(ioc, printk(MPT3SAS_FMT
                    "%s: failed getting to correct state\n",
                    ioc->name, __func__));
                return r;
        }
        mpi_reply_sz = sizeof(Mpi2IOCFactsReply_t);
        mpi_request_sz = sizeof(Mpi2IOCFactsRequest_t);
        memset(&mpi_request, 0, mpi_request_sz);
        mpi_request.Function = MPI2_FUNCTION_IOC_FACTS;
        r = _base_handshake_req_reply_wait(ioc, mpi_request_sz,
            (u32 *)&mpi_request, mpi_reply_sz, (u16 *)&mpi_reply, 5);

        if (r != 0) {
                pr_err(MPT3SAS_FMT "%s: handshake failed (r=%d)\n",
                    ioc->name, __func__, r);
                return r;
        }

        facts = &ioc->facts;
        memset(facts, 0, sizeof(struct mpt3sas_facts));
        facts->MsgVersion = le16_to_cpu(mpi_reply.MsgVersion);
        facts->HeaderVersion = le16_to_cpu(mpi_reply.HeaderVersion);
        facts->VP_ID = mpi_reply.VP_ID;
        facts->VF_ID = mpi_reply.VF_ID;
        facts->IOCExceptions = le16_to_cpu(mpi_reply.IOCExceptions);
        facts->MaxChainDepth = mpi_reply.MaxChainDepth;
        facts->WhoInit = mpi_reply.WhoInit;
        facts->NumberOfPorts = mpi_reply.NumberOfPorts;
        facts->MaxMSIxVectors = mpi_reply.MaxMSIxVectors;
        facts->RequestCredit = le16_to_cpu(mpi_reply.RequestCredit);
        facts->MaxReplyDescriptorPostQueueDepth =
            le16_to_cpu(mpi_reply.MaxReplyDescriptorPostQueueDepth);
        facts->ProductID = le16_to_cpu(mpi_reply.ProductID);
        facts->IOCCapabilities = le32_to_cpu(mpi_reply.IOCCapabilities);
        if ((facts->IOCCapabilities & MPI2_IOCFACTS_CAPABILITY_INTEGRATED_RAID))
                ioc->ir_firmware = 1;
        if ((facts->IOCCapabilities &
              MPI2_IOCFACTS_CAPABILITY_RDPQ_ARRAY_CAPABLE) && (!reset_devices))
                ioc->rdpq_array_capable = 1;
        facts->FWVersion.Word = le32_to_cpu(mpi_reply.FWVersion.Word);
        facts->IOCRequestFrameSize =
            le16_to_cpu(mpi_reply.IOCRequestFrameSize);
        if (ioc->hba_mpi_version_belonged != MPI2_VERSION) {
                facts->IOCMaxChainSegmentSize =
                        le16_to_cpu(mpi_reply.IOCMaxChainSegmentSize);
        }
        facts->MaxInitiators = le16_to_cpu(mpi_reply.MaxInitiators);
        facts->MaxTargets = le16_to_cpu(mpi_reply.MaxTargets);
        ioc->shost->max_id = -1;
        facts->MaxSasExpanders = le16_to_cpu(mpi_reply.MaxSasExpanders);
        facts->MaxEnclosures = le16_to_cpu(mpi_reply.MaxEnclosures);
        facts->ProtocolFlags = le16_to_cpu(mpi_reply.ProtocolFlags);
        facts->HighPriorityCredit =
            le16_to_cpu(mpi_reply.HighPriorityCredit);
        facts->ReplyFrameSize = mpi_reply.ReplyFrameSize;
        facts->MaxDevHandle = le16_to_cpu(mpi_reply.MaxDevHandle);
        facts->CurrentHostPageSize = mpi_reply.CurrentHostPageSize;

        /*
         * Get the Page Size from IOC Facts. If it's 0, default to 4k.
         */
        ioc->page_size = 1 << facts->CurrentHostPageSize;
        if (ioc->page_size == 1) {
                pr_info(MPT3SAS_FMT "CurrentHostPageSize is 0: Setting "
                        "default host page size to 4k\n", ioc->name);
                ioc->page_size = 1 << MPT3SAS_HOST_PAGE_SIZE_4K;
        }
        dinitprintk(ioc, pr_info(MPT3SAS_FMT "CurrentHostPageSize(%d)\n",
                ioc->name, facts->CurrentHostPageSize));

        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "hba queue depth(%d), max chains per io(%d)\n",
                ioc->name, facts->RequestCredit,
            facts->MaxChainDepth));
        dinitprintk(ioc, pr_info(MPT3SAS_FMT
                "request frame size(%d), reply frame size(%d)\n", ioc->name,
            facts->IOCRequestFrameSize * 4, facts->ReplyFrameSize * 4));
        return 0;
}

/**
 * _base_send_ioc_init - send ioc_init to firmware
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_send_ioc_init(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2IOCInitRequest_t mpi_request;
        Mpi2IOCInitReply_t mpi_reply;
        int i, r = 0;
        ktime_t current_time;
        u16 ioc_status;
        u32 reply_post_free_array_sz = 0;
        Mpi2IOCInitRDPQArrayEntry *reply_post_free_array = NULL;
        dma_addr_t reply_post_free_array_dma;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        memset(&mpi_request, 0, sizeof(Mpi2IOCInitRequest_t));
        mpi_request.Function = MPI2_FUNCTION_IOC_INIT;
        mpi_request.WhoInit = MPI2_WHOINIT_HOST_DRIVER;
        mpi_request.VF_ID = 0; /* TODO */
        mpi_request.VP_ID = 0;
        mpi_request.MsgVersion = cpu_to_le16(ioc->hba_mpi_version_belonged);
        mpi_request.HeaderVersion = cpu_to_le16(MPI2_HEADER_VERSION);
        mpi_request.HostPageSize = MPT3SAS_HOST_PAGE_SIZE_4K;

        if (_base_is_controller_msix_enabled(ioc))
                mpi_request.HostMSIxVectors = ioc->reply_queue_count;
        mpi_request.SystemRequestFrameSize = cpu_to_le16(ioc->request_sz/4);
        mpi_request.ReplyDescriptorPostQueueDepth =
            cpu_to_le16(ioc->reply_post_queue_depth);
        mpi_request.ReplyFreeQueueDepth =
            cpu_to_le16(ioc->reply_free_queue_depth);

        mpi_request.SenseBufferAddressHigh =
            cpu_to_le32((u64)ioc->sense_dma >> 32);
        mpi_request.SystemReplyAddressHigh =
            cpu_to_le32((u64)ioc->reply_dma >> 32);
        mpi_request.SystemRequestFrameBaseAddress =
            cpu_to_le64((u64)ioc->request_dma);
        mpi_request.ReplyFreeQueueAddress =
            cpu_to_le64((u64)ioc->reply_free_dma);

        if (ioc->rdpq_array_enable) {
                reply_post_free_array_sz = ioc->reply_queue_count *
                    sizeof(Mpi2IOCInitRDPQArrayEntry);
                reply_post_free_array = pci_alloc_consistent(ioc->pdev,
                        reply_post_free_array_sz, &reply_post_free_array_dma);
                if (!reply_post_free_array) {
                        pr_err(MPT3SAS_FMT
                        "reply_post_free_array: pci_alloc_consistent failed\n",
                        ioc->name);
                        r = -ENOMEM;
                        goto out;
                }
                memset(reply_post_free_array, 0, reply_post_free_array_sz);
                for (i = 0; i < ioc->reply_queue_count; i++)
                        reply_post_free_array[i].RDPQBaseAddress =
                            cpu_to_le64(
                                (u64)ioc->reply_post[i].reply_post_free_dma);
                mpi_request.MsgFlags = MPI2_IOCINIT_MSGFLAG_RDPQ_ARRAY_MODE;
                mpi_request.ReplyDescriptorPostQueueAddress =
                    cpu_to_le64((u64)reply_post_free_array_dma);
        } else {
                mpi_request.ReplyDescriptorPostQueueAddress =
                    cpu_to_le64((u64)ioc->reply_post[0].reply_post_free_dma);
        }

        /* This time stamp specifies number of milliseconds
         * since epoch ~ midnight January 1, 1970.
         */
        current_time = ktime_get_real();
        mpi_request.TimeStamp = cpu_to_le64(ktime_to_ms(current_time));

        if (ioc->logging_level & MPT_DEBUG_INIT) {
                __le32 *mfp;
                int i;

                mfp = (__le32 *)&mpi_request;
                pr_info("\toffset:data\n");
                for (i = 0; i < sizeof(Mpi2IOCInitRequest_t)/4; i++)
                        pr_info("\t[0x%02x]:%08x\n", i*4,
                            le32_to_cpu(mfp[i]));
        }

        r = _base_handshake_req_reply_wait(ioc,
            sizeof(Mpi2IOCInitRequest_t), (u32 *)&mpi_request,
            sizeof(Mpi2IOCInitReply_t), (u16 *)&mpi_reply, 10);

        if (r != 0) {
                pr_err(MPT3SAS_FMT "%s: handshake failed (r=%d)\n",
                    ioc->name, __func__, r);
                goto out;
        }

        ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS ||
            mpi_reply.IOCLogInfo) {
                pr_err(MPT3SAS_FMT "%s: failed\n", ioc->name, __func__);
                r = -EIO;
        }

out:
        if (reply_post_free_array)
                pci_free_consistent(ioc->pdev, reply_post_free_array_sz,
                                    reply_post_free_array,
                                    reply_post_free_array_dma);
        return r;
}

/**
 * mpt3sas_port_enable_done - command completion routine for port enable
 * @ioc: per adapter object
 * @smid: system request message index
 * @msix_index: MSIX table index supplied by the OS
 * @reply: reply message frame(lower 32bit addr)
 *
 * Return 1 meaning mf should be freed from _base_interrupt
 *        0 means the mf is freed from this function.
 */
u8
mpt3sas_port_enable_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index,
        u32 reply)
{
        MPI2DefaultReply_t *mpi_reply;
        u16 ioc_status;

        if (ioc->port_enable_cmds.status == MPT3_CMD_NOT_USED)
                return 1;

        mpi_reply = mpt3sas_base_get_reply_virt_addr(ioc, reply);
        if (!mpi_reply)
                return 1;

        if (mpi_reply->Function != MPI2_FUNCTION_PORT_ENABLE)
                return 1;

        ioc->port_enable_cmds.status &= ~MPT3_CMD_PENDING;
        ioc->port_enable_cmds.status |= MPT3_CMD_COMPLETE;
        ioc->port_enable_cmds.status |= MPT3_CMD_REPLY_VALID;
        memcpy(ioc->port_enable_cmds.reply, mpi_reply, mpi_reply->MsgLength*4);
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
                ioc->port_enable_failed = 1;

        if (ioc->is_driver_loading) {
                if (ioc_status == MPI2_IOCSTATUS_SUCCESS) {
                        mpt3sas_port_enable_complete(ioc);
                        return 1;
                } else {
                        ioc->start_scan_failed = ioc_status;
                        ioc->start_scan = 0;
                        return 1;
                }
        }
        complete(&ioc->port_enable_cmds.done);
        return 1;
}

/**
 * _base_send_port_enable - send port_enable(discovery stuff) to firmware
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_send_port_enable(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2PortEnableRequest_t *mpi_request;
        Mpi2PortEnableReply_t *mpi_reply;
        int r = 0;
        u16 smid;
        u16 ioc_status;

        pr_info(MPT3SAS_FMT "sending port enable !!\n", ioc->name);

        if (ioc->port_enable_cmds.status & MPT3_CMD_PENDING) {
                pr_err(MPT3SAS_FMT "%s: internal command already in use\n",
                    ioc->name, __func__);
                return -EAGAIN;
        }

        smid = mpt3sas_base_get_smid(ioc, ioc->port_enable_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                return -EAGAIN;
        }

        ioc->port_enable_cmds.status = MPT3_CMD_PENDING;
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->port_enable_cmds.smid = smid;
        memset(mpi_request, 0, sizeof(Mpi2PortEnableRequest_t));
        mpi_request->Function = MPI2_FUNCTION_PORT_ENABLE;

        init_completion(&ioc->port_enable_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        wait_for_completion_timeout(&ioc->port_enable_cmds.done, 300*HZ);
        if (!(ioc->port_enable_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2PortEnableRequest_t)/4);
                if (ioc->port_enable_cmds.status & MPT3_CMD_RESET)
                        r = -EFAULT;
                else
                        r = -ETIME;
                goto out;
        }

        mpi_reply = ioc->port_enable_cmds.reply;
        ioc_status = le16_to_cpu(mpi_reply->IOCStatus) & MPI2_IOCSTATUS_MASK;
        if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
                pr_err(MPT3SAS_FMT "%s: failed with (ioc_status=0x%08x)\n",
                    ioc->name, __func__, ioc_status);
                r = -EFAULT;
                goto out;
        }

 out:
        ioc->port_enable_cmds.status = MPT3_CMD_NOT_USED;
        pr_info(MPT3SAS_FMT "port enable: %s\n", ioc->name, ((r == 0) ?
            "SUCCESS" : "FAILED"));
        return r;
}

/**
 * mpt3sas_port_enable - initiate firmware discovery (don't wait for reply)
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_port_enable(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2PortEnableRequest_t *mpi_request;
        u16 smid;

        pr_info(MPT3SAS_FMT "sending port enable !!\n", ioc->name);

        if (ioc->port_enable_cmds.status & MPT3_CMD_PENDING) {
                pr_err(MPT3SAS_FMT "%s: internal command already in use\n",
                    ioc->name, __func__);
                return -EAGAIN;
        }

        smid = mpt3sas_base_get_smid(ioc, ioc->port_enable_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                return -EAGAIN;
        }

        ioc->port_enable_cmds.status = MPT3_CMD_PENDING;
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->port_enable_cmds.smid = smid;
        memset(mpi_request, 0, sizeof(Mpi2PortEnableRequest_t));
        mpi_request->Function = MPI2_FUNCTION_PORT_ENABLE;

        mpt3sas_base_put_smid_default(ioc, smid);
        return 0;
}

/**
 * _base_determine_wait_on_discovery - desposition
 * @ioc: per adapter object
 *
 * Decide whether to wait on discovery to complete. Used to either
 * locate boot device, or report volumes ahead of physical devices.
 *
 * Returns 1 for wait, 0 for don't wait
 */
static int
_base_determine_wait_on_discovery(struct MPT3SAS_ADAPTER *ioc)
{
        /* We wait for discovery to complete if IR firmware is loaded.
         * The sas topology events arrive before PD events, so we need time to
         * turn on the bit in ioc->pd_handles to indicate PD
         * Also, it maybe required to report Volumes ahead of physical
         * devices when MPI2_IOCPAGE8_IRFLAGS_LOW_VOLUME_MAPPING is set.
         */
        if (ioc->ir_firmware)
                return 1;

        /* if no Bios, then we don't need to wait */
        if (!ioc->bios_pg3.BiosVersion)
                return 0;

        /* Bios is present, then we drop down here.
         *
         * If there any entries in the Bios Page 2, then we wait
         * for discovery to complete.
         */

        /* Current Boot Device */
        if ((ioc->bios_pg2.CurrentBootDeviceForm &
            MPI2_BIOSPAGE2_FORM_MASK) ==
            MPI2_BIOSPAGE2_FORM_NO_DEVICE_SPECIFIED &&
        /* Request Boot Device */
           (ioc->bios_pg2.ReqBootDeviceForm &
            MPI2_BIOSPAGE2_FORM_MASK) ==
            MPI2_BIOSPAGE2_FORM_NO_DEVICE_SPECIFIED &&
        /* Alternate Request Boot Device */
           (ioc->bios_pg2.ReqAltBootDeviceForm &
            MPI2_BIOSPAGE2_FORM_MASK) ==
            MPI2_BIOSPAGE2_FORM_NO_DEVICE_SPECIFIED)
                return 0;

        return 1;
}

/**
 * _base_unmask_events - turn on notification for this event
 * @ioc: per adapter object
 * @event: firmware event
 *
 * The mask is stored in ioc->event_masks.
 */
static void
_base_unmask_events(struct MPT3SAS_ADAPTER *ioc, u16 event)
{
        u32 desired_event;

        if (event >= 128)
                return;

        desired_event = (1 << (event % 32));

        if (event < 32)
                ioc->event_masks[0] &= ~desired_event;
        else if (event < 64)
                ioc->event_masks[1] &= ~desired_event;
        else if (event < 96)
                ioc->event_masks[2] &= ~desired_event;
        else if (event < 128)
                ioc->event_masks[3] &= ~desired_event;
}

/**
 * _base_event_notification - send event notification
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_event_notification(struct MPT3SAS_ADAPTER *ioc)
{
        Mpi2EventNotificationRequest_t *mpi_request;
        u16 smid;
        int r = 0;
        int i;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        if (ioc->base_cmds.status & MPT3_CMD_PENDING) {
                pr_err(MPT3SAS_FMT "%s: internal command already in use\n",
                    ioc->name, __func__);
                return -EAGAIN;
        }

        smid = mpt3sas_base_get_smid(ioc, ioc->base_cb_idx);
        if (!smid) {
                pr_err(MPT3SAS_FMT "%s: failed obtaining a smid\n",
                    ioc->name, __func__);
                return -EAGAIN;
        }
        ioc->base_cmds.status = MPT3_CMD_PENDING;
        mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
        ioc->base_cmds.smid = smid;
        memset(mpi_request, 0, sizeof(Mpi2EventNotificationRequest_t));
        mpi_request->Function = MPI2_FUNCTION_EVENT_NOTIFICATION;
        mpi_request->VF_ID = 0; /* TODO */
        mpi_request->VP_ID = 0;
        for (i = 0; i < MPI2_EVENT_NOTIFY_EVENTMASK_WORDS; i++)
                mpi_request->EventMasks[i] =
                    cpu_to_le32(ioc->event_masks[i]);
        init_completion(&ioc->base_cmds.done);
        mpt3sas_base_put_smid_default(ioc, smid);
        wait_for_completion_timeout(&ioc->base_cmds.done, 30*HZ);
        if (!(ioc->base_cmds.status & MPT3_CMD_COMPLETE)) {
                pr_err(MPT3SAS_FMT "%s: timeout\n",
                    ioc->name, __func__);
                _debug_dump_mf(mpi_request,
                    sizeof(Mpi2EventNotificationRequest_t)/4);
                if (ioc->base_cmds.status & MPT3_CMD_RESET)
                        r = -EFAULT;
                else
                        r = -ETIME;
        } else
                dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s: complete\n",
                    ioc->name, __func__));
        ioc->base_cmds.status = MPT3_CMD_NOT_USED;
        return r;
}

/**
 * mpt3sas_base_validate_event_type - validating event types
 * @ioc: per adapter object
 * @event: firmware event
 *
 * This will turn on firmware event notification when application
 * ask for that event. We don't mask events that are already enabled.
 */
void
mpt3sas_base_validate_event_type(struct MPT3SAS_ADAPTER *ioc, u32 *event_type)
{
        int i, j;
        u32 event_mask, desired_event;
        u8 send_update_to_fw;

        for (i = 0, send_update_to_fw = 0; i <
            MPI2_EVENT_NOTIFY_EVENTMASK_WORDS; i++) {
                event_mask = ~event_type[i];
                desired_event = 1;
                for (j = 0; j < 32; j++) {
                        if (!(event_mask & desired_event) &&
                            (ioc->event_masks[i] & desired_event)) {
                                ioc->event_masks[i] &= ~desired_event;
                                send_update_to_fw = 1;
                        }
                        desired_event = (desired_event << 1);
                }
        }

        if (!send_update_to_fw)
                return;

        mutex_lock(&ioc->base_cmds.mutex);
        _base_event_notification(ioc);
        mutex_unlock(&ioc->base_cmds.mutex);
}

/**
 * _base_diag_reset - the "big hammer" start of day reset
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
{
        u32 host_diagnostic;
        u32 ioc_state;
        u32 count;
        u32 hcb_size;

        pr_info(MPT3SAS_FMT "sending diag reset !!\n", ioc->name);

        drsprintk(ioc, pr_info(MPT3SAS_FMT "clear interrupts\n",
            ioc->name));

        count = 0;
        do {
                /* Write magic sequence to WriteSequence register
                 * Loop until in diagnostic mode
                 */
                drsprintk(ioc, pr_info(MPT3SAS_FMT
                        "write magic sequence\n", ioc->name));
                writel(MPI2_WRSEQ_FLUSH_KEY_VALUE, &ioc->chip->WriteSequence);
                writel(MPI2_WRSEQ_1ST_KEY_VALUE, &ioc->chip->WriteSequence);
                writel(MPI2_WRSEQ_2ND_KEY_VALUE, &ioc->chip->WriteSequence);
                writel(MPI2_WRSEQ_3RD_KEY_VALUE, &ioc->chip->WriteSequence);
                writel(MPI2_WRSEQ_4TH_KEY_VALUE, &ioc->chip->WriteSequence);
                writel(MPI2_WRSEQ_5TH_KEY_VALUE, &ioc->chip->WriteSequence);
                writel(MPI2_WRSEQ_6TH_KEY_VALUE, &ioc->chip->WriteSequence);

                /* wait 100 msec */
                msleep(100);

                if (count++ > 20)
                        goto out;

                host_diagnostic = readl(&ioc->chip->HostDiagnostic);
                drsprintk(ioc, pr_info(MPT3SAS_FMT
                        "wrote magic sequence: count(%d), host_diagnostic(0x%08x)\n",
                    ioc->name, count, host_diagnostic));

        } while ((host_diagnostic & MPI2_DIAG_DIAG_WRITE_ENABLE) == 0);

        hcb_size = readl(&ioc->chip->HCBSize);

        drsprintk(ioc, pr_info(MPT3SAS_FMT "diag reset: issued\n",
            ioc->name));
        writel(host_diagnostic | MPI2_DIAG_RESET_ADAPTER,
             &ioc->chip->HostDiagnostic);

        /*This delay allows the chip PCIe hardware time to finish reset tasks*/
        msleep(MPI2_HARD_RESET_PCIE_FIRST_READ_DELAY_MICRO_SEC/1000);

        /* Approximately 300 second max wait */
        for (count = 0; count < (300000000 /
                MPI2_HARD_RESET_PCIE_SECOND_READ_DELAY_MICRO_SEC); count++) {

                host_diagnostic = readl(&ioc->chip->HostDiagnostic);

                if (host_diagnostic == 0xFFFFFFFF)
                        goto out;
                if (!(host_diagnostic & MPI2_DIAG_RESET_ADAPTER))
                        break;

                msleep(MPI2_HARD_RESET_PCIE_SECOND_READ_DELAY_MICRO_SEC / 1000);
        }

        if (host_diagnostic & MPI2_DIAG_HCB_MODE) {

                drsprintk(ioc, pr_info(MPT3SAS_FMT
                "restart the adapter assuming the HCB Address points to good F/W\n",
                    ioc->name));
                host_diagnostic &= ~MPI2_DIAG_BOOT_DEVICE_SELECT_MASK;
                host_diagnostic |= MPI2_DIAG_BOOT_DEVICE_SELECT_HCDW;
                writel(host_diagnostic, &ioc->chip->HostDiagnostic);

                drsprintk(ioc, pr_info(MPT3SAS_FMT
                    "re-enable the HCDW\n", ioc->name));
                writel(hcb_size | MPI2_HCB_SIZE_HCB_ENABLE,
                    &ioc->chip->HCBSize);
        }

        drsprintk(ioc, pr_info(MPT3SAS_FMT "restart the adapter\n",
            ioc->name));
        writel(host_diagnostic & ~MPI2_DIAG_HOLD_IOC_RESET,
            &ioc->chip->HostDiagnostic);

        drsprintk(ioc, pr_info(MPT3SAS_FMT
                "disable writes to the diagnostic register\n", ioc->name));
        writel(MPI2_WRSEQ_FLUSH_KEY_VALUE, &ioc->chip->WriteSequence);

        drsprintk(ioc, pr_info(MPT3SAS_FMT
                "Wait for FW to go to the READY state\n", ioc->name));
        ioc_state = _base_wait_on_iocstate(ioc, MPI2_IOC_STATE_READY, 20);
        if (ioc_state) {
                pr_err(MPT3SAS_FMT
                        "%s: failed going to ready state (ioc_state=0x%x)\n",
                        ioc->name, __func__, ioc_state);
                goto out;
        }

        pr_info(MPT3SAS_FMT "diag reset: SUCCESS\n", ioc->name);
        return 0;

 out:
        pr_err(MPT3SAS_FMT "diag reset: FAILED\n", ioc->name);
        return -EFAULT;
}

/**
 * _base_make_ioc_ready - put controller in READY state
 * @ioc: per adapter object
 * @type: FORCE_BIG_HAMMER or SOFT_RESET
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_make_ioc_ready(struct MPT3SAS_ADAPTER *ioc, enum reset_type type)
{
        u32 ioc_state;
        int rc;
        int count;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        if (ioc->pci_error_recovery)
                return 0;

        ioc_state = mpt3sas_base_get_iocstate(ioc, 0);
        dhsprintk(ioc, pr_info(MPT3SAS_FMT "%s: ioc_state(0x%08x)\n",
            ioc->name, __func__, ioc_state));

        /* if in RESET state, it should move to READY state shortly */
        count = 0;
        if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_RESET) {
                while ((ioc_state & MPI2_IOC_STATE_MASK) !=
                    MPI2_IOC_STATE_READY) {
                        if (count++ == 10) {
                                pr_err(MPT3SAS_FMT
                                        "%s: failed going to ready state (ioc_state=0x%x)\n",
                                    ioc->name, __func__, ioc_state);
                                return -EFAULT;
                        }
                        ssleep(1);
                        ioc_state = mpt3sas_base_get_iocstate(ioc, 0);
                }
        }

        if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_READY)
                return 0;

        if (ioc_state & MPI2_DOORBELL_USED) {
                dhsprintk(ioc, pr_info(MPT3SAS_FMT
                        "unexpected doorbell active!\n",
                        ioc->name));
                goto issue_diag_reset;
        }

        if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
                mpt3sas_base_fault_info(ioc, ioc_state &
                    MPI2_DOORBELL_DATA_MASK);
                goto issue_diag_reset;
        }

        if (type == FORCE_BIG_HAMMER)
                goto issue_diag_reset;

        if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_OPERATIONAL)
                if (!(_base_send_ioc_reset(ioc,
                    MPI2_FUNCTION_IOC_MESSAGE_UNIT_RESET, 15))) {
                        return 0;
        }

 issue_diag_reset:
        rc = _base_diag_reset(ioc);
        return rc;
}

/**
 * _base_make_ioc_operational - put controller in OPERATIONAL state
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
static int
_base_make_ioc_operational(struct MPT3SAS_ADAPTER *ioc)
{
        int r, i, index;
        unsigned long   flags;
        u32 reply_address;
        u16 smid;
        struct _tr_list *delayed_tr, *delayed_tr_next;
        struct _sc_list *delayed_sc, *delayed_sc_next;
        struct _event_ack_list *delayed_event_ack, *delayed_event_ack_next;
        u8 hide_flag;
        struct adapter_reply_queue *reply_q;
        Mpi2ReplyDescriptorsUnion_t *reply_post_free_contig;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        /* clean the delayed target reset list */
        list_for_each_entry_safe(delayed_tr, delayed_tr_next,
            &ioc->delayed_tr_list, list) {
                list_del(&delayed_tr->list);
                kfree(delayed_tr);
        }


        list_for_each_entry_safe(delayed_tr, delayed_tr_next,
            &ioc->delayed_tr_volume_list, list) {
                list_del(&delayed_tr->list);
                kfree(delayed_tr);
        }

        list_for_each_entry_safe(delayed_sc, delayed_sc_next,
            &ioc->delayed_sc_list, list) {
                list_del(&delayed_sc->list);
                kfree(delayed_sc);
        }

        list_for_each_entry_safe(delayed_event_ack, delayed_event_ack_next,
            &ioc->delayed_event_ack_list, list) {
                list_del(&delayed_event_ack->list);
                kfree(delayed_event_ack);
        }

        spin_lock_irqsave(&ioc->scsi_lookup_lock, flags);

        /* hi-priority queue */
        INIT_LIST_HEAD(&ioc->hpr_free_list);
        smid = ioc->hi_priority_smid;
        for (i = 0; i < ioc->hi_priority_depth; i++, smid++) {
                ioc->hpr_lookup[i].cb_idx = 0xFF;
                ioc->hpr_lookup[i].smid = smid;
                list_add_tail(&ioc->hpr_lookup[i].tracker_list,
                    &ioc->hpr_free_list);
        }

        /* internal queue */
        INIT_LIST_HEAD(&ioc->internal_free_list);
        smid = ioc->internal_smid;
        for (i = 0; i < ioc->internal_depth; i++, smid++) {
                ioc->internal_lookup[i].cb_idx = 0xFF;
                ioc->internal_lookup[i].smid = smid;
                list_add_tail(&ioc->internal_lookup[i].tracker_list,
                    &ioc->internal_free_list);
        }

        /* chain pool */
        INIT_LIST_HEAD(&ioc->free_chain_list);
        for (i = 0; i < ioc->chain_depth; i++)
                list_add_tail(&ioc->chain_lookup[i].tracker_list,
                    &ioc->free_chain_list);

        spin_unlock_irqrestore(&ioc->scsi_lookup_lock, flags);

        /* initialize Reply Free Queue */
        for (i = 0, reply_address = (u32)ioc->reply_dma ;
            i < ioc->reply_free_queue_depth ; i++, reply_address +=
            ioc->reply_sz) {
                ioc->reply_free[i] = cpu_to_le32(reply_address);
                if (ioc->is_mcpu_endpoint)
                        _base_clone_reply_to_sys_mem(ioc,
                                        (__le32)reply_address, i);
        }

        /* initialize reply queues */
        if (ioc->is_driver_loading)
                _base_assign_reply_queues(ioc);

        /* initialize Reply Post Free Queue */
        index = 0;
        reply_post_free_contig = ioc->reply_post[0].reply_post_free;
        list_for_each_entry(reply_q, &ioc->reply_queue_list, list) {
                /*
                 * If RDPQ is enabled, switch to the next allocation.
                 * Otherwise advance within the contiguous region.
                 */
                if (ioc->rdpq_array_enable) {
                        reply_q->reply_post_free =
                                ioc->reply_post[index++].reply_post_free;
                } else {
                        reply_q->reply_post_free = reply_post_free_contig;
                        reply_post_free_contig += ioc->reply_post_queue_depth;
                }

                reply_q->reply_post_host_index = 0;
                for (i = 0; i < ioc->reply_post_queue_depth; i++)
                        reply_q->reply_post_free[i].Words =
                            cpu_to_le64(ULLONG_MAX);
                if (!_base_is_controller_msix_enabled(ioc))
                        goto skip_init_reply_post_free_queue;
        }
 skip_init_reply_post_free_queue:

        r = _base_send_ioc_init(ioc);
        if (r)
                return r;

        /* initialize reply free host index */
        ioc->reply_free_host_index = ioc->reply_free_queue_depth - 1;
        writel(ioc->reply_free_host_index, &ioc->chip->ReplyFreeHostIndex);

        /* initialize reply post host index */
        list_for_each_entry(reply_q, &ioc->reply_queue_list, list) {
                if (ioc->combined_reply_queue)
                        writel((reply_q->msix_index & 7)<<
                           MPI2_RPHI_MSIX_INDEX_SHIFT,
                           ioc->replyPostRegisterIndex[reply_q->msix_index/8]);
                else
                        writel(reply_q->msix_index <<
                                MPI2_RPHI_MSIX_INDEX_SHIFT,
                                &ioc->chip->ReplyPostHostIndex);

                if (!_base_is_controller_msix_enabled(ioc))
                        goto skip_init_reply_post_host_index;
        }

 skip_init_reply_post_host_index:

        _base_unmask_interrupts(ioc);
        r = _base_event_notification(ioc);
        if (r)
                return r;

        _base_static_config_pages(ioc);

        if (ioc->is_driver_loading) {

                if (ioc->is_warpdrive && ioc->manu_pg10.OEMIdentifier
                    == 0x80) {
                        hide_flag = (u8) (
                            le32_to_cpu(ioc->manu_pg10.OEMSpecificFlags0) &
                            MFG_PAGE10_HIDE_SSDS_MASK);
                        if (hide_flag != MFG_PAGE10_HIDE_SSDS_MASK)
                                ioc->mfg_pg10_hide_flag = hide_flag;
                }

                ioc->wait_for_discovery_to_complete =
                    _base_determine_wait_on_discovery(ioc);

                return r; /* scan_start and scan_finished support */
        }

        r = _base_send_port_enable(ioc);
        if (r)
                return r;

        return r;
}

/**
 * mpt3sas_base_free_resources - free resources controller resources
 * @ioc: per adapter object
 *
 * Return nothing.
 */
void
mpt3sas_base_free_resources(struct MPT3SAS_ADAPTER *ioc)
{
        dexitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        /* synchronizing freeing resource with pci_access_mutex lock */
        mutex_lock(&ioc->pci_access_mutex);
        if (ioc->chip_phys && ioc->chip) {
                _base_mask_interrupts(ioc);
                ioc->shost_recovery = 1;
                _base_make_ioc_ready(ioc, SOFT_RESET);
                ioc->shost_recovery = 0;
        }

        mpt3sas_base_unmap_resources(ioc);
        mutex_unlock(&ioc->pci_access_mutex);
        return;
}

/**
 * mpt3sas_base_attach - attach controller instance
 * @ioc: per adapter object
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
{
        int r, i;
        int cpu_id, last_cpu_id = 0;

        dinitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        /* setup cpu_msix_table */
        ioc->cpu_count = num_online_cpus();
        for_each_online_cpu(cpu_id)
                last_cpu_id = cpu_id;
        ioc->cpu_msix_table_sz = last_cpu_id + 1;
        ioc->cpu_msix_table = kzalloc(ioc->cpu_msix_table_sz, GFP_KERNEL);
        ioc->reply_queue_count = 1;
        if (!ioc->cpu_msix_table) {
                dfailprintk(ioc, pr_info(MPT3SAS_FMT
                        "allocation for cpu_msix_table failed!!!\n",
                        ioc->name));
                r = -ENOMEM;
                goto out_free_resources;
        }

        if (ioc->is_warpdrive) {
                ioc->reply_post_host_index = kcalloc(ioc->cpu_msix_table_sz,
                    sizeof(resource_size_t *), GFP_KERNEL);
                if (!ioc->reply_post_host_index) {
                        dfailprintk(ioc, pr_info(MPT3SAS_FMT "allocation "
                                "for reply_post_host_index failed!!!\n",
                                ioc->name));
                        r = -ENOMEM;
                        goto out_free_resources;
                }
        }

        ioc->rdpq_array_enable_assigned = 0;
        ioc->dma_mask = 0;
        r = mpt3sas_base_map_resources(ioc);
        if (r)
                goto out_free_resources;

        pci_set_drvdata(ioc->pdev, ioc->shost);
        r = _base_get_ioc_facts(ioc);
        if (r)
                goto out_free_resources;

        switch (ioc->hba_mpi_version_belonged) {
        case MPI2_VERSION:
                ioc->build_sg_scmd = &_base_build_sg_scmd;
                ioc->build_sg = &_base_build_sg;
                ioc->build_zero_len_sge = &_base_build_zero_len_sge;
                break;
        case MPI25_VERSION:
        case MPI26_VERSION:
                /*
                 * In SAS3.0,
                 * SCSI_IO, SMP_PASSTHRU, SATA_PASSTHRU, Target Assist, and
                 * Target Status - all require the IEEE formated scatter gather
                 * elements.
                 */
                ioc->build_sg_scmd = &_base_build_sg_scmd_ieee;
                ioc->build_sg = &_base_build_sg_ieee;
                ioc->build_nvme_prp = &_base_build_nvme_prp;
                ioc->build_zero_len_sge = &_base_build_zero_len_sge_ieee;
                ioc->sge_size_ieee = sizeof(Mpi2IeeeSgeSimple64_t);

                break;
        }

        if (ioc->is_mcpu_endpoint)
                ioc->put_smid_scsi_io = &_base_put_smid_mpi_ep_scsi_io;
        else
                ioc->put_smid_scsi_io = &_base_put_smid_scsi_io;

        /*
         * These function pointers for other requests that don't
         * the require IEEE scatter gather elements.
         *
         * For example Configuration Pages and SAS IOUNIT Control don't.
         */
        ioc->build_sg_mpi = &_base_build_sg;
        ioc->build_zero_len_sge_mpi = &_base_build_zero_len_sge;

        r = _base_make_ioc_ready(ioc, SOFT_RESET);
        if (r)
                goto out_free_resources;

        ioc->pfacts = kcalloc(ioc->facts.NumberOfPorts,
            sizeof(struct mpt3sas_port_facts), GFP_KERNEL);
        if (!ioc->pfacts) {
                r = -ENOMEM;
                goto out_free_resources;
        }

        for (i = 0 ; i < ioc->facts.NumberOfPorts; i++) {
                r = _base_get_port_facts(ioc, i);
                if (r)
                        goto out_free_resources;
        }

        r = _base_allocate_memory_pools(ioc);
        if (r)
                goto out_free_resources;

        init_waitqueue_head(&ioc->reset_wq);

        /* allocate memory pd handle bitmask list */
        ioc->pd_handles_sz = (ioc->facts.MaxDevHandle / 8);
        if (ioc->facts.MaxDevHandle % 8)
                ioc->pd_handles_sz++;
        ioc->pd_handles = kzalloc(ioc->pd_handles_sz,
            GFP_KERNEL);
        if (!ioc->pd_handles) {
                r = -ENOMEM;
                goto out_free_resources;
        }
        ioc->blocking_handles = kzalloc(ioc->pd_handles_sz,
            GFP_KERNEL);
        if (!ioc->blocking_handles) {
                r = -ENOMEM;
                goto out_free_resources;
        }

        /* allocate memory for pending OS device add list */
        ioc->pend_os_device_add_sz = (ioc->facts.MaxDevHandle / 8);
        if (ioc->facts.MaxDevHandle % 8)
                ioc->pend_os_device_add_sz++;
        ioc->pend_os_device_add = kzalloc(ioc->pend_os_device_add_sz,
            GFP_KERNEL);
        if (!ioc->pend_os_device_add)
                goto out_free_resources;

        ioc->device_remove_in_progress_sz = ioc->pend_os_device_add_sz;
        ioc->device_remove_in_progress =
                kzalloc(ioc->device_remove_in_progress_sz, GFP_KERNEL);
        if (!ioc->device_remove_in_progress)
                goto out_free_resources;

        ioc->fwfault_debug = mpt3sas_fwfault_debug;

        /* base internal command bits */
        mutex_init(&ioc->base_cmds.mutex);
        ioc->base_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->base_cmds.status = MPT3_CMD_NOT_USED;

        /* port_enable command bits */
        ioc->port_enable_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->port_enable_cmds.status = MPT3_CMD_NOT_USED;

        /* transport internal command bits */
        ioc->transport_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->transport_cmds.status = MPT3_CMD_NOT_USED;
        mutex_init(&ioc->transport_cmds.mutex);

        /* scsih internal command bits */
        ioc->scsih_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->scsih_cmds.status = MPT3_CMD_NOT_USED;
        mutex_init(&ioc->scsih_cmds.mutex);

        /* task management internal command bits */
        ioc->tm_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->tm_cmds.status = MPT3_CMD_NOT_USED;
        mutex_init(&ioc->tm_cmds.mutex);

        /* config page internal command bits */
        ioc->config_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->config_cmds.status = MPT3_CMD_NOT_USED;
        mutex_init(&ioc->config_cmds.mutex);

        /* ctl module internal command bits */
        ioc->ctl_cmds.reply = kzalloc(ioc->reply_sz, GFP_KERNEL);
        ioc->ctl_cmds.sense = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
        ioc->ctl_cmds.status = MPT3_CMD_NOT_USED;
        mutex_init(&ioc->ctl_cmds.mutex);

        if (!ioc->base_cmds.reply || !ioc->port_enable_cmds.reply ||
            !ioc->transport_cmds.reply || !ioc->scsih_cmds.reply ||
            !ioc->tm_cmds.reply || !ioc->config_cmds.reply ||
            !ioc->ctl_cmds.reply || !ioc->ctl_cmds.sense) {
                r = -ENOMEM;
                goto out_free_resources;
        }

        for (i = 0; i < MPI2_EVENT_NOTIFY_EVENTMASK_WORDS; i++)
                ioc->event_masks[i] = -1;

        /* here we enable the events we care about */
        _base_unmask_events(ioc, MPI2_EVENT_SAS_DISCOVERY);
        _base_unmask_events(ioc, MPI2_EVENT_SAS_BROADCAST_PRIMITIVE);
        _base_unmask_events(ioc, MPI2_EVENT_SAS_TOPOLOGY_CHANGE_LIST);
        _base_unmask_events(ioc, MPI2_EVENT_SAS_DEVICE_STATUS_CHANGE);
        _base_unmask_events(ioc, MPI2_EVENT_SAS_ENCL_DEVICE_STATUS_CHANGE);
        _base_unmask_events(ioc, MPI2_EVENT_IR_CONFIGURATION_CHANGE_LIST);
        _base_unmask_events(ioc, MPI2_EVENT_IR_VOLUME);
        _base_unmask_events(ioc, MPI2_EVENT_IR_PHYSICAL_DISK);
        _base_unmask_events(ioc, MPI2_EVENT_IR_OPERATION_STATUS);
        _base_unmask_events(ioc, MPI2_EVENT_LOG_ENTRY_ADDED);
        _base_unmask_events(ioc, MPI2_EVENT_TEMP_THRESHOLD);
        _base_unmask_events(ioc, MPI2_EVENT_ACTIVE_CABLE_EXCEPTION);
        if (ioc->hba_mpi_version_belonged == MPI26_VERSION) {
                if (ioc->is_gen35_ioc) {
                        _base_unmask_events(ioc,
                                MPI2_EVENT_PCIE_DEVICE_STATUS_CHANGE);
                        _base_unmask_events(ioc, MPI2_EVENT_PCIE_ENUMERATION);
                        _base_unmask_events(ioc,
                                MPI2_EVENT_PCIE_TOPOLOGY_CHANGE_LIST);
                }
        }
        r = _base_make_ioc_operational(ioc);
        if (r)
                goto out_free_resources;

        ioc->non_operational_loop = 0;
        ioc->got_task_abort_from_ioctl = 0;
        return 0;

 out_free_resources:

        ioc->remove_host = 1;

        mpt3sas_base_free_resources(ioc);
        _base_release_memory_pools(ioc);
        pci_set_drvdata(ioc->pdev, NULL);
        kfree(ioc->cpu_msix_table);
        if (ioc->is_warpdrive)
                kfree(ioc->reply_post_host_index);
        kfree(ioc->pd_handles);
        kfree(ioc->blocking_handles);
        kfree(ioc->device_remove_in_progress);
        kfree(ioc->pend_os_device_add);
        kfree(ioc->tm_cmds.reply);
        kfree(ioc->transport_cmds.reply);
        kfree(ioc->scsih_cmds.reply);
        kfree(ioc->config_cmds.reply);
        kfree(ioc->base_cmds.reply);
        kfree(ioc->port_enable_cmds.reply);
        kfree(ioc->ctl_cmds.reply);
        kfree(ioc->ctl_cmds.sense);
        kfree(ioc->pfacts);
        ioc->ctl_cmds.reply = NULL;
        ioc->base_cmds.reply = NULL;
        ioc->tm_cmds.reply = NULL;
        ioc->scsih_cmds.reply = NULL;
        ioc->transport_cmds.reply = NULL;
        ioc->config_cmds.reply = NULL;
        ioc->pfacts = NULL;
        return r;
}


/**
 * mpt3sas_base_detach - remove controller instance
 * @ioc: per adapter object
 *
 * Return nothing.
 */
void
mpt3sas_base_detach(struct MPT3SAS_ADAPTER *ioc)
{
        dexitprintk(ioc, pr_info(MPT3SAS_FMT "%s\n", ioc->name,
            __func__));

        mpt3sas_base_stop_watchdog(ioc);
        mpt3sas_base_free_resources(ioc);
        _base_release_memory_pools(ioc);
        pci_set_drvdata(ioc->pdev, NULL);
        kfree(ioc->cpu_msix_table);
        if (ioc->is_warpdrive)
                kfree(ioc->reply_post_host_index);
        kfree(ioc->pd_handles);
        kfree(ioc->blocking_handles);
        kfree(ioc->device_remove_in_progress);
        kfree(ioc->pend_os_device_add);
        kfree(ioc->pfacts);
        kfree(ioc->ctl_cmds.reply);
        kfree(ioc->ctl_cmds.sense);
        kfree(ioc->base_cmds.reply);
        kfree(ioc->port_enable_cmds.reply);
        kfree(ioc->tm_cmds.reply);
        kfree(ioc->transport_cmds.reply);
        kfree(ioc->scsih_cmds.reply);
        kfree(ioc->config_cmds.reply);
}

/**
 * _base_reset_handler - reset callback handler (for base)
 * @ioc: per adapter object
 * @reset_phase: phase
 *
 * The handler for doing any required cleanup or initialization.
 *
 * The reset phase can be MPT3_IOC_PRE_RESET, MPT3_IOC_AFTER_RESET,
 * MPT3_IOC_DONE_RESET
 *
 * Return nothing.
 */
static void
_base_reset_handler(struct MPT3SAS_ADAPTER *ioc, int reset_phase)
{
        mpt3sas_scsih_reset_handler(ioc, reset_phase);
        mpt3sas_ctl_reset_handler(ioc, reset_phase);
        switch (reset_phase) {
        case MPT3_IOC_PRE_RESET:
                dtmprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: MPT3_IOC_PRE_RESET\n", ioc->name, __func__));
                break;
        case MPT3_IOC_AFTER_RESET:
                dtmprintk(ioc, pr_info(MPT3SAS_FMT
                "%s: MPT3_IOC_AFTER_RESET\n", ioc->name, __func__));
                if (ioc->transport_cmds.status & MPT3_CMD_PENDING) {
                        ioc->transport_cmds.status |= MPT3_CMD_RESET;
                        mpt3sas_base_free_smid(ioc, ioc->transport_cmds.smid);
                        complete(&ioc->transport_cmds.done);
                }
                if (ioc->base_cmds.status & MPT3_CMD_PENDING) {
                        ioc->base_cmds.status |= MPT3_CMD_RESET;
                        mpt3sas_base_free_smid(ioc, ioc->base_cmds.smid);
                        complete(&ioc->base_cmds.done);
                }
                if (ioc->port_enable_cmds.status & MPT3_CMD_PENDING) {
                        ioc->port_enable_failed = 1;
                        ioc->port_enable_cmds.status |= MPT3_CMD_RESET;
                        mpt3sas_base_free_smid(ioc, ioc->port_enable_cmds.smid);
                        if (ioc->is_driver_loading) {
                                ioc->start_scan_failed =
                                    MPI2_IOCSTATUS_INTERNAL_ERROR;
                                ioc->start_scan = 0;
                                ioc->port_enable_cmds.status =
                                    MPT3_CMD_NOT_USED;
                        } else
                                complete(&ioc->port_enable_cmds.done);
                }
                if (ioc->config_cmds.status & MPT3_CMD_PENDING) {
                        ioc->config_cmds.status |= MPT3_CMD_RESET;
                        mpt3sas_base_free_smid(ioc, ioc->config_cmds.smid);
                        ioc->config_cmds.smid = USHRT_MAX;
                        complete(&ioc->config_cmds.done);
                }
                break;
        case MPT3_IOC_DONE_RESET:
                dtmprintk(ioc, pr_info(MPT3SAS_FMT
                        "%s: MPT3_IOC_DONE_RESET\n", ioc->name, __func__));
                break;
        }
}

/**
 * mpt3sas_wait_for_commands_to_complete - reset controller
 * @ioc: Pointer to MPT_ADAPTER structure
 *
 * This function is waiting 10s for all pending commands to complete
 * prior to putting controller in reset.
 */
void
mpt3sas_wait_for_commands_to_complete(struct MPT3SAS_ADAPTER *ioc)
{
        u32 ioc_state;

        ioc->pending_io_count = 0;

        ioc_state = mpt3sas_base_get_iocstate(ioc, 0);
        if ((ioc_state & MPI2_IOC_STATE_MASK) != MPI2_IOC_STATE_OPERATIONAL)
                return;

        /* pending command count */
        ioc->pending_io_count = atomic_read(&ioc->shost->host_busy);

        if (!ioc->pending_io_count)
                return;

        /* wait for pending commands to complete */
        wait_event_timeout(ioc->reset_wq, ioc->pending_io_count == 0, 10 * HZ);
}

/**
 * mpt3sas_base_hard_reset_handler - reset controller
 * @ioc: Pointer to MPT_ADAPTER structure
 * @type: FORCE_BIG_HAMMER or SOFT_RESET
 *
 * Returns 0 for success, non-zero for failure.
 */
int
mpt3sas_base_hard_reset_handler(struct MPT3SAS_ADAPTER *ioc,
        enum reset_type type)
{
        int r;
        unsigned long flags;
        u32 ioc_state;
        u8 is_fault = 0, is_trigger = 0;

        dtmprintk(ioc, pr_info(MPT3SAS_FMT "%s: enter\n", ioc->name,
            __func__));

        if (ioc->pci_error_recovery) {
                pr_err(MPT3SAS_FMT "%s: pci error recovery reset\n",
                    ioc->name, __func__);
                r = 0;
                goto out_unlocked;
        }

        if (mpt3sas_fwfault_debug)
                mpt3sas_halt_firmware(ioc);

        /* wait for an active reset in progress to complete */
        if (!mutex_trylock(&ioc->reset_in_progress_mutex)) {
                do {
                        ssleep(1);
                } while (ioc->shost_recovery == 1);
                dtmprintk(ioc, pr_info(MPT3SAS_FMT "%s: exit\n", ioc->name,
                    __func__));
                return ioc->ioc_reset_in_progress_status;
        }

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        ioc->shost_recovery = 1;
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);

        if ((ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] &
            MPT3_DIAG_BUFFER_IS_REGISTERED) &&
            (!(ioc->diag_buffer_status[MPI2_DIAG_BUF_TYPE_TRACE] &
            MPT3_DIAG_BUFFER_IS_RELEASED))) {
                is_trigger = 1;
                ioc_state = mpt3sas_base_get_iocstate(ioc, 0);
                if ((ioc_state & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT)
                        is_fault = 1;
        }
        _base_reset_handler(ioc, MPT3_IOC_PRE_RESET);
        mpt3sas_wait_for_commands_to_complete(ioc);
        _base_mask_interrupts(ioc);
        r = _base_make_ioc_ready(ioc, type);
        if (r)
                goto out;
        _base_reset_handler(ioc, MPT3_IOC_AFTER_RESET);

        /* If this hard reset is called while port enable is active, then
         * there is no reason to call make_ioc_operational
         */
        if (ioc->is_driver_loading && ioc->port_enable_failed) {
                ioc->remove_host = 1;
                r = -EFAULT;
                goto out;
        }
        r = _base_get_ioc_facts(ioc);
        if (r)
                goto out;

        if (ioc->rdpq_array_enable && !ioc->rdpq_array_capable)
                panic("%s: Issue occurred with flashing controller firmware."
                      "Please reboot the system and ensure that the correct"
                      " firmware version is running\n", ioc->name);

        r = _base_make_ioc_operational(ioc);
        if (!r)
                _base_reset_handler(ioc, MPT3_IOC_DONE_RESET);

 out:
        dtmprintk(ioc, pr_info(MPT3SAS_FMT "%s: %s\n",
            ioc->name, __func__, ((r == 0) ? "SUCCESS" : "FAILED")));

        spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
        ioc->ioc_reset_in_progress_status = r;
        ioc->shost_recovery = 0;
        spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
        ioc->ioc_reset_count++;
        mutex_unlock(&ioc->reset_in_progress_mutex);

 out_unlocked:
        if ((r == 0) && is_trigger) {
                if (is_fault)
                        mpt3sas_trigger_master(ioc, MASTER_TRIGGER_FW_FAULT);
                else
                        mpt3sas_trigger_master(ioc,
                            MASTER_TRIGGER_ADAPTER_RESET);
        }
        dtmprintk(ioc, pr_info(MPT3SAS_FMT "%s: exit\n", ioc->name,
            __func__));
        return r;
}