+++ /dev/null
-/*
- * NVM Express device driver
- * Copyright (c) 2011, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
- * 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include <linux/nvme.h>
-#include <linux/bio.h>
-#include <linux/bitops.h>
-#include <linux/blkdev.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/idr.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kdev_t.h>
-#include <linux/kthread.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/pci.h>
-#include <linux/poison.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-
-#include <asm-generic/io-64-nonatomic-lo-hi.h>
-
-#define NVME_Q_DEPTH 1024
-#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
-#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
-#define NVME_MINORS 64
-#define NVME_IO_TIMEOUT (5 * HZ)
-#define ADMIN_TIMEOUT (60 * HZ)
-
-static int nvme_major;
-module_param(nvme_major, int, 0);
-
-static int use_threaded_interrupts;
-module_param(use_threaded_interrupts, int, 0);
-
-static DEFINE_SPINLOCK(dev_list_lock);
-static LIST_HEAD(dev_list);
-static struct task_struct *nvme_thread;
-
-/*
- * Represents an NVM Express device. Each nvme_dev is a PCI function.
- */
-struct nvme_dev {
- struct list_head node;
- struct nvme_queue **queues;
- u32 __iomem *dbs;
- struct pci_dev *pci_dev;
- struct dma_pool *prp_page_pool;
- struct dma_pool *prp_small_pool;
- int instance;
- int queue_count;
- int db_stride;
- u32 ctrl_config;
- struct msix_entry *entry;
- struct nvme_bar __iomem *bar;
- struct list_head namespaces;
- char serial[20];
- char model[40];
- char firmware_rev[8];
- u32 max_hw_sectors;
- u16 oncs;
-};
-
-/*
- * An NVM Express namespace is equivalent to a SCSI LUN
- */
-struct nvme_ns {
- struct list_head list;
-
- struct nvme_dev *dev;
- struct request_queue *queue;
- struct gendisk *disk;
-
- int ns_id;
- int lba_shift;
-};
-
-/*
- * An NVM Express queue. Each device has at least two (one for admin
- * commands and one for I/O commands).
- */
-struct nvme_queue {
- struct device *q_dmadev;
- struct nvme_dev *dev;
- spinlock_t q_lock;
- struct nvme_command *sq_cmds;
- volatile struct nvme_completion *cqes;
- dma_addr_t sq_dma_addr;
- dma_addr_t cq_dma_addr;
- wait_queue_head_t sq_full;
- wait_queue_t sq_cong_wait;
- struct bio_list sq_cong;
- u32 __iomem *q_db;
- u16 q_depth;
- u16 cq_vector;
- u16 sq_head;
- u16 sq_tail;
- u16 cq_head;
- u16 cq_phase;
- unsigned long cmdid_data[];
-};
-
-/*
- * Check we didin't inadvertently grow the command struct
- */
-static inline void _nvme_check_size(void)
-{
- BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096);
- BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096);
- BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
-}
-
-typedef void (*nvme_completion_fn)(struct nvme_dev *, void *,
- struct nvme_completion *);
-
-struct nvme_cmd_info {
- nvme_completion_fn fn;
- void *ctx;
- unsigned long timeout;
-};
-
-static struct nvme_cmd_info *nvme_cmd_info(struct nvme_queue *nvmeq)
-{
- return (void *)&nvmeq->cmdid_data[BITS_TO_LONGS(nvmeq->q_depth)];
-}
-
-/**
- * alloc_cmdid() - Allocate a Command ID
- * @nvmeq: The queue that will be used for this command
- * @ctx: A pointer that will be passed to the handler
- * @handler: The function to call on completion
- *
- * Allocate a Command ID for a queue. The data passed in will
- * be passed to the completion handler. This is implemented by using
- * the bottom two bits of the ctx pointer to store the handler ID.
- * Passing in a pointer that's not 4-byte aligned will cause a BUG.
- * We can change this if it becomes a problem.
- *
- * May be called with local interrupts disabled and the q_lock held,
- * or with interrupts enabled and no locks held.
- */
-static int alloc_cmdid(struct nvme_queue *nvmeq, void *ctx,
- nvme_completion_fn handler, unsigned timeout)
-{
- int depth = nvmeq->q_depth - 1;
- struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
- int cmdid;
-
- do {
- cmdid = find_first_zero_bit(nvmeq->cmdid_data, depth);
- if (cmdid >= depth)
- return -EBUSY;
- } while (test_and_set_bit(cmdid, nvmeq->cmdid_data));
-
- info[cmdid].fn = handler;
- info[cmdid].ctx = ctx;
- info[cmdid].timeout = jiffies + timeout;
- return cmdid;
-}
-
-static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx,
- nvme_completion_fn handler, unsigned timeout)
-{
- int cmdid;
- wait_event_killable(nvmeq->sq_full,
- (cmdid = alloc_cmdid(nvmeq, ctx, handler, timeout)) >= 0);
- return (cmdid < 0) ? -EINTR : cmdid;
-}
-
-/* Special values must be less than 0x1000 */
-#define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
-#define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
-#define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
-#define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
-#define CMD_CTX_FLUSH (0x318 + CMD_CTX_BASE)
-
-static void special_completion(struct nvme_dev *dev, void *ctx,
- struct nvme_completion *cqe)
-{
- if (ctx == CMD_CTX_CANCELLED)
- return;
- if (ctx == CMD_CTX_FLUSH)
- return;
- if (ctx == CMD_CTX_COMPLETED) {
- dev_warn(&dev->pci_dev->dev,
- "completed id %d twice on queue %d\n",
- cqe->command_id, le16_to_cpup(&cqe->sq_id));
- return;
- }
- if (ctx == CMD_CTX_INVALID) {
- dev_warn(&dev->pci_dev->dev,
- "invalid id %d completed on queue %d\n",
- cqe->command_id, le16_to_cpup(&cqe->sq_id));
- return;
- }
-
- dev_warn(&dev->pci_dev->dev, "Unknown special completion %p\n", ctx);
-}
-
-/*
- * Called with local interrupts disabled and the q_lock held. May not sleep.
- */
-static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid,
- nvme_completion_fn *fn)
-{
- void *ctx;
- struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
-
- if (cmdid >= nvmeq->q_depth) {
- *fn = special_completion;
- return CMD_CTX_INVALID;
- }
- if (fn)
- *fn = info[cmdid].fn;
- ctx = info[cmdid].ctx;
- info[cmdid].fn = special_completion;
- info[cmdid].ctx = CMD_CTX_COMPLETED;
- clear_bit(cmdid, nvmeq->cmdid_data);
- wake_up(&nvmeq->sq_full);
- return ctx;
-}
-
-static void *cancel_cmdid(struct nvme_queue *nvmeq, int cmdid,
- nvme_completion_fn *fn)
-{
- void *ctx;
- struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
- if (fn)
- *fn = info[cmdid].fn;
- ctx = info[cmdid].ctx;
- info[cmdid].fn = special_completion;
- info[cmdid].ctx = CMD_CTX_CANCELLED;
- return ctx;
-}
-
-static struct nvme_queue *get_nvmeq(struct nvme_dev *dev)
-{
- return dev->queues[get_cpu() + 1];
-}
-
-static void put_nvmeq(struct nvme_queue *nvmeq)
-{
- put_cpu();
-}
-
-/**
- * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
- * @nvmeq: The queue to use
- * @cmd: The command to send
- *
- * Safe to use from interrupt context
- */
-static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
-{
- unsigned long flags;
- u16 tail;
- spin_lock_irqsave(&nvmeq->q_lock, flags);
- tail = nvmeq->sq_tail;
- memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
- if (++tail == nvmeq->q_depth)
- tail = 0;
- writel(tail, nvmeq->q_db);
- nvmeq->sq_tail = tail;
- spin_unlock_irqrestore(&nvmeq->q_lock, flags);
-
- return 0;
-}
-
-/*
- * The nvme_iod describes the data in an I/O, including the list of PRP
- * entries. You can't see it in this data structure because C doesn't let
- * me express that. Use nvme_alloc_iod to ensure there's enough space
- * allocated to store the PRP list.
- */
-struct nvme_iod {
- void *private; /* For the use of the submitter of the I/O */
- int npages; /* In the PRP list. 0 means small pool in use */
- int offset; /* Of PRP list */
- int nents; /* Used in scatterlist */
- int length; /* Of data, in bytes */
- dma_addr_t first_dma;
- struct scatterlist sg[0];
-};
-
-static __le64 **iod_list(struct nvme_iod *iod)
-{
- return ((void *)iod) + iod->offset;
-}
-
-/*
- * Will slightly overestimate the number of pages needed. This is OK
- * as it only leads to a small amount of wasted memory for the lifetime of
- * the I/O.
- */
-static int nvme_npages(unsigned size)
-{
- unsigned nprps = DIV_ROUND_UP(size + PAGE_SIZE, PAGE_SIZE);
- return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
-}
-
-static struct nvme_iod *
-nvme_alloc_iod(unsigned nseg, unsigned nbytes, gfp_t gfp)
-{
- struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) +
- sizeof(__le64 *) * nvme_npages(nbytes) +
- sizeof(struct scatterlist) * nseg, gfp);
-
- if (iod) {
- iod->offset = offsetof(struct nvme_iod, sg[nseg]);
- iod->npages = -1;
- iod->length = nbytes;
- iod->nents = 0;
- }
-
- return iod;
-}
-
-static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
-{
- const int last_prp = PAGE_SIZE / 8 - 1;
- int i;
- __le64 **list = iod_list(iod);
- dma_addr_t prp_dma = iod->first_dma;
-
- if (iod->npages == 0)
- dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
- for (i = 0; i < iod->npages; i++) {
- __le64 *prp_list = list[i];
- dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]);
- dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);
- prp_dma = next_prp_dma;
- }
- kfree(iod);
-}
-
-static void requeue_bio(struct nvme_dev *dev, struct bio *bio)
-{
- struct nvme_queue *nvmeq = get_nvmeq(dev);
- if (bio_list_empty(&nvmeq->sq_cong))
- add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
- bio_list_add(&nvmeq->sq_cong, bio);
- put_nvmeq(nvmeq);
- wake_up_process(nvme_thread);
-}
-
-static void bio_completion(struct nvme_dev *dev, void *ctx,
- struct nvme_completion *cqe)
-{
- struct nvme_iod *iod = ctx;
- struct bio *bio = iod->private;
- u16 status = le16_to_cpup(&cqe->status) >> 1;
-
- if (iod->nents)
- dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
- bio_data_dir(bio) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
- nvme_free_iod(dev, iod);
- if (status) {
- bio_endio(bio, -EIO);
- } else if (bio->bi_vcnt > bio->bi_idx) {
- requeue_bio(dev, bio);
- } else {
- bio_endio(bio, 0);
- }
-}
-
-/* length is in bytes. gfp flags indicates whether we may sleep. */
-static int nvme_setup_prps(struct nvme_dev *dev,
- struct nvme_common_command *cmd, struct nvme_iod *iod,
- int total_len, gfp_t gfp)
-{
- struct dma_pool *pool;
- int length = total_len;
- struct scatterlist *sg = iod->sg;
- int dma_len = sg_dma_len(sg);
- u64 dma_addr = sg_dma_address(sg);
- int offset = offset_in_page(dma_addr);
- __le64 *prp_list;
- __le64 **list = iod_list(iod);
- dma_addr_t prp_dma;
- int nprps, i;
-
- cmd->prp1 = cpu_to_le64(dma_addr);
- length -= (PAGE_SIZE - offset);
- if (length <= 0)
- return total_len;
-
- dma_len -= (PAGE_SIZE - offset);
- if (dma_len) {
- dma_addr += (PAGE_SIZE - offset);
- } else {
- sg = sg_next(sg);
- dma_addr = sg_dma_address(sg);
- dma_len = sg_dma_len(sg);
- }
-
- if (length <= PAGE_SIZE) {
- cmd->prp2 = cpu_to_le64(dma_addr);
- return total_len;
- }
-
- nprps = DIV_ROUND_UP(length, PAGE_SIZE);
- if (nprps <= (256 / 8)) {
- pool = dev->prp_small_pool;
- iod->npages = 0;
- } else {
- pool = dev->prp_page_pool;
- iod->npages = 1;
- }
-
- prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
- if (!prp_list) {
- cmd->prp2 = cpu_to_le64(dma_addr);
- iod->npages = -1;
- return (total_len - length) + PAGE_SIZE;
- }
- list[0] = prp_list;
- iod->first_dma = prp_dma;
- cmd->prp2 = cpu_to_le64(prp_dma);
- i = 0;
- for (;;) {
- if (i == PAGE_SIZE / 8) {
- __le64 *old_prp_list = prp_list;
- prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
- if (!prp_list)
- return total_len - length;
- list[iod->npages++] = prp_list;
- prp_list[0] = old_prp_list[i - 1];
- old_prp_list[i - 1] = cpu_to_le64(prp_dma);
- i = 1;
- }
- prp_list[i++] = cpu_to_le64(dma_addr);
- dma_len -= PAGE_SIZE;
- dma_addr += PAGE_SIZE;
- length -= PAGE_SIZE;
- if (length <= 0)
- break;
- if (dma_len > 0)
- continue;
- BUG_ON(dma_len < 0);
- sg = sg_next(sg);
- dma_addr = sg_dma_address(sg);
- dma_len = sg_dma_len(sg);
- }
-
- return total_len;
-}
-
-/* NVMe scatterlists require no holes in the virtual address */
-#define BIOVEC_NOT_VIRT_MERGEABLE(vec1, vec2) ((vec2)->bv_offset || \
- (((vec1)->bv_offset + (vec1)->bv_len) % PAGE_SIZE))
-
-static int nvme_map_bio(struct device *dev, struct nvme_iod *iod,
- struct bio *bio, enum dma_data_direction dma_dir, int psegs)
-{
- struct bio_vec *bvec, *bvprv = NULL;
- struct scatterlist *sg = NULL;
- int i, old_idx, length = 0, nsegs = 0;
-
- sg_init_table(iod->sg, psegs);
- old_idx = bio->bi_idx;
- bio_for_each_segment(bvec, bio, i) {
- if (bvprv && BIOVEC_PHYS_MERGEABLE(bvprv, bvec)) {
- sg->length += bvec->bv_len;
- } else {
- if (bvprv && BIOVEC_NOT_VIRT_MERGEABLE(bvprv, bvec))
- break;
- sg = sg ? sg + 1 : iod->sg;
- sg_set_page(sg, bvec->bv_page, bvec->bv_len,
- bvec->bv_offset);
- nsegs++;
- }
- length += bvec->bv_len;
- bvprv = bvec;
- }
- bio->bi_idx = i;
- iod->nents = nsegs;
- sg_mark_end(sg);
- if (dma_map_sg(dev, iod->sg, iod->nents, dma_dir) == 0) {
- bio->bi_idx = old_idx;
- return -ENOMEM;
- }
- return length;
-}
-
-/*
- * We reuse the small pool to allocate the 16-byte range here as it is not
- * worth having a special pool for these or additional cases to handle freeing
- * the iod.
- */
-static int nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
- struct bio *bio, struct nvme_iod *iod, int cmdid)
-{
- struct nvme_dsm_range *range;
- struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
-
- range = dma_pool_alloc(nvmeq->dev->prp_small_pool, GFP_ATOMIC,
- &iod->first_dma);
- if (!range)
- return -ENOMEM;
-
- iod_list(iod)[0] = (__le64 *)range;
- iod->npages = 0;
-
- range->cattr = cpu_to_le32(0);
- range->nlb = cpu_to_le32(bio->bi_size >> ns->lba_shift);
- range->slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9));
-
- memset(cmnd, 0, sizeof(*cmnd));
- cmnd->dsm.opcode = nvme_cmd_dsm;
- cmnd->dsm.command_id = cmdid;
- cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
- cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma);
- cmnd->dsm.nr = 0;
- cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
-
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
-
- return 0;
-}
-
-static int nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
- int cmdid)
-{
- struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
-
- memset(cmnd, 0, sizeof(*cmnd));
- cmnd->common.opcode = nvme_cmd_flush;
- cmnd->common.command_id = cmdid;
- cmnd->common.nsid = cpu_to_le32(ns->ns_id);
-
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
-
- return 0;
-}
-
-static int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns)
-{
- int cmdid = alloc_cmdid(nvmeq, (void *)CMD_CTX_FLUSH,
- special_completion, NVME_IO_TIMEOUT);
- if (unlikely(cmdid < 0))
- return cmdid;
-
- return nvme_submit_flush(nvmeq, ns, cmdid);
-}
-
-/*
- * Called with local interrupts disabled and the q_lock held. May not sleep.
- */
-static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
- struct bio *bio)
-{
- struct nvme_command *cmnd;
- struct nvme_iod *iod;
- enum dma_data_direction dma_dir;
- int cmdid, length, result = -ENOMEM;
- u16 control;
- u32 dsmgmt;
- int psegs = bio_phys_segments(ns->queue, bio);
-
- if ((bio->bi_rw & REQ_FLUSH) && psegs) {
- result = nvme_submit_flush_data(nvmeq, ns);
- if (result)
- return result;
- }
-
- iod = nvme_alloc_iod(psegs, bio->bi_size, GFP_ATOMIC);
- if (!iod)
- goto nomem;
- iod->private = bio;
-
- result = -EBUSY;
- cmdid = alloc_cmdid(nvmeq, iod, bio_completion, NVME_IO_TIMEOUT);
- if (unlikely(cmdid < 0))
- goto free_iod;
-
- if (bio->bi_rw & REQ_DISCARD) {
- result = nvme_submit_discard(nvmeq, ns, bio, iod, cmdid);
- if (result)
- goto free_cmdid;
- return result;
- }
- if ((bio->bi_rw & REQ_FLUSH) && !psegs)
- return nvme_submit_flush(nvmeq, ns, cmdid);
-
- control = 0;
- if (bio->bi_rw & REQ_FUA)
- control |= NVME_RW_FUA;
- if (bio->bi_rw & (REQ_FAILFAST_DEV | REQ_RAHEAD))
- control |= NVME_RW_LR;
-
- dsmgmt = 0;
- if (bio->bi_rw & REQ_RAHEAD)
- dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
-
- cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
-
- memset(cmnd, 0, sizeof(*cmnd));
- if (bio_data_dir(bio)) {
- cmnd->rw.opcode = nvme_cmd_write;
- dma_dir = DMA_TO_DEVICE;
- } else {
- cmnd->rw.opcode = nvme_cmd_read;
- dma_dir = DMA_FROM_DEVICE;
- }
-
- result = nvme_map_bio(nvmeq->q_dmadev, iod, bio, dma_dir, psegs);
- if (result < 0)
- goto free_cmdid;
- length = result;
-
- cmnd->rw.command_id = cmdid;
- cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
- length = nvme_setup_prps(nvmeq->dev, &cmnd->common, iod, length,
- GFP_ATOMIC);
- cmnd->rw.slba = cpu_to_le64(bio->bi_sector >> (ns->lba_shift - 9));
- cmnd->rw.length = cpu_to_le16((length >> ns->lba_shift) - 1);
- cmnd->rw.control = cpu_to_le16(control);
- cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
-
- bio->bi_sector += length >> 9;
-
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
-
- return 0;
-
- free_cmdid:
- free_cmdid(nvmeq, cmdid, NULL);
- free_iod:
- nvme_free_iod(nvmeq->dev, iod);
- nomem:
- return result;
-}
-
-static void nvme_make_request(struct request_queue *q, struct bio *bio)
-{
- struct nvme_ns *ns = q->queuedata;
- struct nvme_queue *nvmeq = get_nvmeq(ns->dev);
- int result = -EBUSY;
-
- spin_lock_irq(&nvmeq->q_lock);
- if (bio_list_empty(&nvmeq->sq_cong))
- result = nvme_submit_bio_queue(nvmeq, ns, bio);
- if (unlikely(result)) {
- if (bio_list_empty(&nvmeq->sq_cong))
- add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
- bio_list_add(&nvmeq->sq_cong, bio);
- }
-
- spin_unlock_irq(&nvmeq->q_lock);
- put_nvmeq(nvmeq);
-}
-
-static irqreturn_t nvme_process_cq(struct nvme_queue *nvmeq)
-{
- u16 head, phase;
-
- head = nvmeq->cq_head;
- phase = nvmeq->cq_phase;
-
- for (;;) {
- void *ctx;
- nvme_completion_fn fn;
- struct nvme_completion cqe = nvmeq->cqes[head];
- if ((le16_to_cpu(cqe.status) & 1) != phase)
- break;
- nvmeq->sq_head = le16_to_cpu(cqe.sq_head);
- if (++head == nvmeq->q_depth) {
- head = 0;
- phase = !phase;
- }
-
- ctx = free_cmdid(nvmeq, cqe.command_id, &fn);
- fn(nvmeq->dev, ctx, &cqe);
- }
-
- /* If the controller ignores the cq head doorbell and continuously
- * writes to the queue, it is theoretically possible to wrap around
- * the queue twice and mistakenly return IRQ_NONE. Linux only
- * requires that 0.1% of your interrupts are handled, so this isn't
- * a big problem.
- */
- if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
- return IRQ_NONE;
-
- writel(head, nvmeq->q_db + (1 << nvmeq->dev->db_stride));
- nvmeq->cq_head = head;
- nvmeq->cq_phase = phase;
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t nvme_irq(int irq, void *data)
-{
- irqreturn_t result;
- struct nvme_queue *nvmeq = data;
- spin_lock(&nvmeq->q_lock);
- result = nvme_process_cq(nvmeq);
- spin_unlock(&nvmeq->q_lock);
- return result;
-}
-
-static irqreturn_t nvme_irq_check(int irq, void *data)
-{
- struct nvme_queue *nvmeq = data;
- struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head];
- if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase)
- return IRQ_NONE;
- return IRQ_WAKE_THREAD;
-}
-
-static void nvme_abort_command(struct nvme_queue *nvmeq, int cmdid)
-{
- spin_lock_irq(&nvmeq->q_lock);
- cancel_cmdid(nvmeq, cmdid, NULL);
- spin_unlock_irq(&nvmeq->q_lock);
-}
-
-struct sync_cmd_info {
- struct task_struct *task;
- u32 result;
- int status;
-};
-
-static void sync_completion(struct nvme_dev *dev, void *ctx,
- struct nvme_completion *cqe)
-{
- struct sync_cmd_info *cmdinfo = ctx;
- cmdinfo->result = le32_to_cpup(&cqe->result);
- cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
- wake_up_process(cmdinfo->task);
-}
-
-/*
- * Returns 0 on success. If the result is negative, it's a Linux error code;
- * if the result is positive, it's an NVM Express status code
- */
-static int nvme_submit_sync_cmd(struct nvme_queue *nvmeq,
- struct nvme_command *cmd, u32 *result, unsigned timeout)
-{
- int cmdid;
- struct sync_cmd_info cmdinfo;
-
- cmdinfo.task = current;
- cmdinfo.status = -EINTR;
-
- cmdid = alloc_cmdid_killable(nvmeq, &cmdinfo, sync_completion,
- timeout);
- if (cmdid < 0)
- return cmdid;
- cmd->common.command_id = cmdid;
-
- set_current_state(TASK_KILLABLE);
- nvme_submit_cmd(nvmeq, cmd);
- schedule();
-
- if (cmdinfo.status == -EINTR) {
- nvme_abort_command(nvmeq, cmdid);
- return -EINTR;
- }
-
- if (result)
- *result = cmdinfo.result;
-
- return cmdinfo.status;
-}
-
-static int nvme_submit_admin_cmd(struct nvme_dev *dev, struct nvme_command *cmd,
- u32 *result)
-{
- return nvme_submit_sync_cmd(dev->queues[0], cmd, result, ADMIN_TIMEOUT);
-}
-
-static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
-{
- int status;
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.delete_queue.opcode = opcode;
- c.delete_queue.qid = cpu_to_le16(id);
-
- status = nvme_submit_admin_cmd(dev, &c, NULL);
- if (status)
- return -EIO;
- return 0;
-}
-
-static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
- struct nvme_queue *nvmeq)
-{
- int status;
- struct nvme_command c;
- int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
-
- memset(&c, 0, sizeof(c));
- c.create_cq.opcode = nvme_admin_create_cq;
- c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr);
- c.create_cq.cqid = cpu_to_le16(qid);
- c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
- c.create_cq.cq_flags = cpu_to_le16(flags);
- c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
-
- status = nvme_submit_admin_cmd(dev, &c, NULL);
- if (status)
- return -EIO;
- return 0;
-}
-
-static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
- struct nvme_queue *nvmeq)
-{
- int status;
- struct nvme_command c;
- int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM;
-
- memset(&c, 0, sizeof(c));
- c.create_sq.opcode = nvme_admin_create_sq;
- c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr);
- c.create_sq.sqid = cpu_to_le16(qid);
- c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
- c.create_sq.sq_flags = cpu_to_le16(flags);
- c.create_sq.cqid = cpu_to_le16(qid);
-
- status = nvme_submit_admin_cmd(dev, &c, NULL);
- if (status)
- return -EIO;
- return 0;
-}
-
-static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid)
-{
- return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid);
-}
-
-static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
-{
- return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
-}
-
-static int nvme_identify(struct nvme_dev *dev, unsigned nsid, unsigned cns,
- dma_addr_t dma_addr)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.identify.opcode = nvme_admin_identify;
- c.identify.nsid = cpu_to_le32(nsid);
- c.identify.prp1 = cpu_to_le64(dma_addr);
- c.identify.cns = cpu_to_le32(cns);
-
- return nvme_submit_admin_cmd(dev, &c, NULL);
-}
-
-static int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
- dma_addr_t dma_addr, u32 *result)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.features.opcode = nvme_admin_get_features;
- c.features.nsid = cpu_to_le32(nsid);
- c.features.prp1 = cpu_to_le64(dma_addr);
- c.features.fid = cpu_to_le32(fid);
-
- return nvme_submit_admin_cmd(dev, &c, result);
-}
-
-static int nvme_set_features(struct nvme_dev *dev, unsigned fid,
- unsigned dword11, dma_addr_t dma_addr, u32 *result)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.features.opcode = nvme_admin_set_features;
- c.features.prp1 = cpu_to_le64(dma_addr);
- c.features.fid = cpu_to_le32(fid);
- c.features.dword11 = cpu_to_le32(dword11);
-
- return nvme_submit_admin_cmd(dev, &c, result);
-}
-
-/**
- * nvme_cancel_ios - Cancel outstanding I/Os
- * @queue: The queue to cancel I/Os on
- * @timeout: True to only cancel I/Os which have timed out
- */
-static void nvme_cancel_ios(struct nvme_queue *nvmeq, bool timeout)
-{
- int depth = nvmeq->q_depth - 1;
- struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
- unsigned long now = jiffies;
- int cmdid;
-
- for_each_set_bit(cmdid, nvmeq->cmdid_data, depth) {
- void *ctx;
- nvme_completion_fn fn;
- static struct nvme_completion cqe = {
- .status = cpu_to_le16(NVME_SC_ABORT_REQ) << 1,
- };
-
- if (timeout && !time_after(now, info[cmdid].timeout))
- continue;
- dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d\n", cmdid);
- ctx = cancel_cmdid(nvmeq, cmdid, &fn);
- fn(nvmeq->dev, ctx, &cqe);
- }
-}
-
-static void nvme_free_queue_mem(struct nvme_queue *nvmeq)
-{
- dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
- (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
- dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
- nvmeq->sq_cmds, nvmeq->sq_dma_addr);
- kfree(nvmeq);
-}
-
-static void nvme_free_queue(struct nvme_dev *dev, int qid)
-{
- struct nvme_queue *nvmeq = dev->queues[qid];
- int vector = dev->entry[nvmeq->cq_vector].vector;
-
- spin_lock_irq(&nvmeq->q_lock);
- nvme_cancel_ios(nvmeq, false);
- while (bio_list_peek(&nvmeq->sq_cong)) {
- struct bio *bio = bio_list_pop(&nvmeq->sq_cong);
- bio_endio(bio, -EIO);
- }
- spin_unlock_irq(&nvmeq->q_lock);
-
- irq_set_affinity_hint(vector, NULL);
- free_irq(vector, nvmeq);
-
- /* Don't tell the adapter to delete the admin queue */
- if (qid) {
- adapter_delete_sq(dev, qid);
- adapter_delete_cq(dev, qid);
- }
-
- nvme_free_queue_mem(nvmeq);
-}
-
-static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
- int depth, int vector)
-{
- struct device *dmadev = &dev->pci_dev->dev;
- unsigned extra = DIV_ROUND_UP(depth, 8) + (depth *
- sizeof(struct nvme_cmd_info));
- struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq) + extra, GFP_KERNEL);
- if (!nvmeq)
- return NULL;
-
- nvmeq->cqes = dma_alloc_coherent(dmadev, CQ_SIZE(depth),
- &nvmeq->cq_dma_addr, GFP_KERNEL);
- if (!nvmeq->cqes)
- goto free_nvmeq;
- memset((void *)nvmeq->cqes, 0, CQ_SIZE(depth));
-
- nvmeq->sq_cmds = dma_alloc_coherent(dmadev, SQ_SIZE(depth),
- &nvmeq->sq_dma_addr, GFP_KERNEL);
- if (!nvmeq->sq_cmds)
- goto free_cqdma;
-
- nvmeq->q_dmadev = dmadev;
- nvmeq->dev = dev;
- spin_lock_init(&nvmeq->q_lock);
- nvmeq->cq_head = 0;
- nvmeq->cq_phase = 1;
- init_waitqueue_head(&nvmeq->sq_full);
- init_waitqueue_entry(&nvmeq->sq_cong_wait, nvme_thread);
- bio_list_init(&nvmeq->sq_cong);
- nvmeq->q_db = &dev->dbs[qid << (dev->db_stride + 1)];
- nvmeq->q_depth = depth;
- nvmeq->cq_vector = vector;
-
- return nvmeq;
-
- free_cqdma:
- dma_free_coherent(dmadev, CQ_SIZE(nvmeq->q_depth), (void *)nvmeq->cqes,
- nvmeq->cq_dma_addr);
- free_nvmeq:
- kfree(nvmeq);
- return NULL;
-}
-
-static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq,
- const char *name)
-{
- if (use_threaded_interrupts)
- return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector,
- nvme_irq_check, nvme_irq,
- IRQF_DISABLED | IRQF_SHARED,
- name, nvmeq);
- return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq,
- IRQF_DISABLED | IRQF_SHARED, name, nvmeq);
-}
-
-static struct nvme_queue *nvme_create_queue(struct nvme_dev *dev, int qid,
- int cq_size, int vector)
-{
- int result;
- struct nvme_queue *nvmeq = nvme_alloc_queue(dev, qid, cq_size, vector);
-
- if (!nvmeq)
- return ERR_PTR(-ENOMEM);
-
- result = adapter_alloc_cq(dev, qid, nvmeq);
- if (result < 0)
- goto free_nvmeq;
-
- result = adapter_alloc_sq(dev, qid, nvmeq);
- if (result < 0)
- goto release_cq;
-
- result = queue_request_irq(dev, nvmeq, "nvme");
- if (result < 0)
- goto release_sq;
-
- return nvmeq;
-
- release_sq:
- adapter_delete_sq(dev, qid);
- release_cq:
- adapter_delete_cq(dev, qid);
- free_nvmeq:
- dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
- (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
- dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
- nvmeq->sq_cmds, nvmeq->sq_dma_addr);
- kfree(nvmeq);
- return ERR_PTR(result);
-}
-
-static int nvme_configure_admin_queue(struct nvme_dev *dev)
-{
- int result = 0;
- u32 aqa;
- u64 cap;
- unsigned long timeout;
- struct nvme_queue *nvmeq;
-
- dev->dbs = ((void __iomem *)dev->bar) + 4096;
-
- nvmeq = nvme_alloc_queue(dev, 0, 64, 0);
- if (!nvmeq)
- return -ENOMEM;
-
- aqa = nvmeq->q_depth - 1;
- aqa |= aqa << 16;
-
- dev->ctrl_config = NVME_CC_ENABLE | NVME_CC_CSS_NVM;
- dev->ctrl_config |= (PAGE_SHIFT - 12) << NVME_CC_MPS_SHIFT;
- dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
- dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
-
- writel(0, &dev->bar->cc);
- writel(aqa, &dev->bar->aqa);
- writeq(nvmeq->sq_dma_addr, &dev->bar->asq);
- writeq(nvmeq->cq_dma_addr, &dev->bar->acq);
- writel(dev->ctrl_config, &dev->bar->cc);
-
- cap = readq(&dev->bar->cap);
- timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
- dev->db_stride = NVME_CAP_STRIDE(cap);
-
- while (!result && !(readl(&dev->bar->csts) & NVME_CSTS_RDY)) {
- msleep(100);
- if (fatal_signal_pending(current))
- result = -EINTR;
- if (time_after(jiffies, timeout)) {
- dev_err(&dev->pci_dev->dev,
- "Device not ready; aborting initialisation\n");
- result = -ENODEV;
- }
- }
-
- if (result) {
- nvme_free_queue_mem(nvmeq);
- return result;
- }
-
- result = queue_request_irq(dev, nvmeq, "nvme admin");
- dev->queues[0] = nvmeq;
- return result;
-}
-
-static struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
- unsigned long addr, unsigned length)
-{
- int i, err, count, nents, offset;
- struct scatterlist *sg;
- struct page **pages;
- struct nvme_iod *iod;
-
- if (addr & 3)
- return ERR_PTR(-EINVAL);
- if (!length)
- return ERR_PTR(-EINVAL);
-
- offset = offset_in_page(addr);
- count = DIV_ROUND_UP(offset + length, PAGE_SIZE);
- pages = kcalloc(count, sizeof(*pages), GFP_KERNEL);
- if (!pages)
- return ERR_PTR(-ENOMEM);
-
- err = get_user_pages_fast(addr, count, 1, pages);
- if (err < count) {
- count = err;
- err = -EFAULT;
- goto put_pages;
- }
-
- iod = nvme_alloc_iod(count, length, GFP_KERNEL);
- sg = iod->sg;
- sg_init_table(sg, count);
- for (i = 0; i < count; i++) {
- sg_set_page(&sg[i], pages[i],
- min_t(int, length, PAGE_SIZE - offset), offset);
- length -= (PAGE_SIZE - offset);
- offset = 0;
- }
- sg_mark_end(&sg[i - 1]);
- iod->nents = count;
-
- err = -ENOMEM;
- nents = dma_map_sg(&dev->pci_dev->dev, sg, count,
- write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
- if (!nents)
- goto free_iod;
-
- kfree(pages);
- return iod;
-
- free_iod:
- kfree(iod);
- put_pages:
- for (i = 0; i < count; i++)
- put_page(pages[i]);
- kfree(pages);
- return ERR_PTR(err);
-}
-
-static void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
- struct nvme_iod *iod)
-{
- int i;
-
- dma_unmap_sg(&dev->pci_dev->dev, iod->sg, iod->nents,
- write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
-
- for (i = 0; i < iod->nents; i++)
- put_page(sg_page(&iod->sg[i]));
-}
-
-static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
-{
- struct nvme_dev *dev = ns->dev;
- struct nvme_queue *nvmeq;
- struct nvme_user_io io;
- struct nvme_command c;
- unsigned length;
- int status;
- struct nvme_iod *iod;
-
- if (copy_from_user(&io, uio, sizeof(io)))
- return -EFAULT;
- length = (io.nblocks + 1) << ns->lba_shift;
-
- switch (io.opcode) {
- case nvme_cmd_write:
- case nvme_cmd_read:
- case nvme_cmd_compare:
- iod = nvme_map_user_pages(dev, io.opcode & 1, io.addr, length);
- break;
- default:
- return -EINVAL;
- }
-
- if (IS_ERR(iod))
- return PTR_ERR(iod);
-
- memset(&c, 0, sizeof(c));
- c.rw.opcode = io.opcode;
- c.rw.flags = io.flags;
- c.rw.nsid = cpu_to_le32(ns->ns_id);
- c.rw.slba = cpu_to_le64(io.slba);
- c.rw.length = cpu_to_le16(io.nblocks);
- c.rw.control = cpu_to_le16(io.control);
- c.rw.dsmgmt = cpu_to_le16(io.dsmgmt);
- c.rw.reftag = io.reftag;
- c.rw.apptag = io.apptag;
- c.rw.appmask = io.appmask;
- /* XXX: metadata */
- length = nvme_setup_prps(dev, &c.common, iod, length, GFP_KERNEL);
-
- nvmeq = get_nvmeq(dev);
- /*
- * Since nvme_submit_sync_cmd sleeps, we can't keep preemption
- * disabled. We may be preempted at any point, and be rescheduled
- * to a different CPU. That will cause cacheline bouncing, but no
- * additional races since q_lock already protects against other CPUs.
- */
- put_nvmeq(nvmeq);
- if (length != (io.nblocks + 1) << ns->lba_shift)
- status = -ENOMEM;
- else
- status = nvme_submit_sync_cmd(nvmeq, &c, NULL, NVME_IO_TIMEOUT);
-
- nvme_unmap_user_pages(dev, io.opcode & 1, iod);
- nvme_free_iod(dev, iod);
- return status;
-}
-
-static int nvme_user_admin_cmd(struct nvme_dev *dev,
- struct nvme_admin_cmd __user *ucmd)
-{
- struct nvme_admin_cmd cmd;
- struct nvme_command c;
- int status, length;
- struct nvme_iod *uninitialized_var(iod);
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
- return -EFAULT;
-
- memset(&c, 0, sizeof(c));
- c.common.opcode = cmd.opcode;
- c.common.flags = cmd.flags;
- c.common.nsid = cpu_to_le32(cmd.nsid);
- c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
- c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
- c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
- c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
- c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
- c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
- c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
- c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
-
- length = cmd.data_len;
- if (cmd.data_len) {
- iod = nvme_map_user_pages(dev, cmd.opcode & 1, cmd.addr,
- length);
- if (IS_ERR(iod))
- return PTR_ERR(iod);
- length = nvme_setup_prps(dev, &c.common, iod, length,
- GFP_KERNEL);
- }
-
- if (length != cmd.data_len)
- status = -ENOMEM;
- else
- status = nvme_submit_admin_cmd(dev, &c, &cmd.result);
-
- if (cmd.data_len) {
- nvme_unmap_user_pages(dev, cmd.opcode & 1, iod);
- nvme_free_iod(dev, iod);
- }
-
- if (!status && copy_to_user(&ucmd->result, &cmd.result,
- sizeof(cmd.result)))
- status = -EFAULT;
-
- return status;
-}
-
-static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
- unsigned long arg)
-{
- struct nvme_ns *ns = bdev->bd_disk->private_data;
-
- switch (cmd) {
- case NVME_IOCTL_ID:
- return ns->ns_id;
- case NVME_IOCTL_ADMIN_CMD:
- return nvme_user_admin_cmd(ns->dev, (void __user *)arg);
- case NVME_IOCTL_SUBMIT_IO:
- return nvme_submit_io(ns, (void __user *)arg);
- default:
- return -ENOTTY;
- }
-}
-
-static const struct block_device_operations nvme_fops = {
- .owner = THIS_MODULE,
- .ioctl = nvme_ioctl,
- .compat_ioctl = nvme_ioctl,
-};
-
-static void nvme_resubmit_bios(struct nvme_queue *nvmeq)
-{
- while (bio_list_peek(&nvmeq->sq_cong)) {
- struct bio *bio = bio_list_pop(&nvmeq->sq_cong);
- struct nvme_ns *ns = bio->bi_bdev->bd_disk->private_data;
- if (nvme_submit_bio_queue(nvmeq, ns, bio)) {
- bio_list_add_head(&nvmeq->sq_cong, bio);
- break;
- }
- if (bio_list_empty(&nvmeq->sq_cong))
- remove_wait_queue(&nvmeq->sq_full,
- &nvmeq->sq_cong_wait);
- }
-}
-
-static int nvme_kthread(void *data)
-{
- struct nvme_dev *dev;
-
- while (!kthread_should_stop()) {
- __set_current_state(TASK_RUNNING);
- spin_lock(&dev_list_lock);
- list_for_each_entry(dev, &dev_list, node) {
- int i;
- for (i = 0; i < dev->queue_count; i++) {
- struct nvme_queue *nvmeq = dev->queues[i];
- if (!nvmeq)
- continue;
- spin_lock_irq(&nvmeq->q_lock);
- if (nvme_process_cq(nvmeq))
- printk("process_cq did something\n");
- nvme_cancel_ios(nvmeq, true);
- nvme_resubmit_bios(nvmeq);
- spin_unlock_irq(&nvmeq->q_lock);
- }
- }
- spin_unlock(&dev_list_lock);
- set_current_state(TASK_INTERRUPTIBLE);
- schedule_timeout(HZ);
- }
- return 0;
-}
-
-static DEFINE_IDA(nvme_index_ida);
-
-static int nvme_get_ns_idx(void)
-{
- int index, error;
-
- do {
- if (!ida_pre_get(&nvme_index_ida, GFP_KERNEL))
- return -1;
-
- spin_lock(&dev_list_lock);
- error = ida_get_new(&nvme_index_ida, &index);
- spin_unlock(&dev_list_lock);
- } while (error == -EAGAIN);
-
- if (error)
- index = -1;
- return index;
-}
-
-static void nvme_put_ns_idx(int index)
-{
- spin_lock(&dev_list_lock);
- ida_remove(&nvme_index_ida, index);
- spin_unlock(&dev_list_lock);
-}
-
-static void nvme_config_discard(struct nvme_ns *ns)
-{
- u32 logical_block_size = queue_logical_block_size(ns->queue);
- ns->queue->limits.discard_zeroes_data = 0;
- ns->queue->limits.discard_alignment = logical_block_size;
- ns->queue->limits.discard_granularity = logical_block_size;
- ns->queue->limits.max_discard_sectors = 0xffffffff;
- queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
-}
-
-static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, int nsid,
- struct nvme_id_ns *id, struct nvme_lba_range_type *rt)
-{
- struct nvme_ns *ns;
- struct gendisk *disk;
- int lbaf;
-
- if (rt->attributes & NVME_LBART_ATTRIB_HIDE)
- return NULL;
-
- ns = kzalloc(sizeof(*ns), GFP_KERNEL);
- if (!ns)
- return NULL;
- ns->queue = blk_alloc_queue(GFP_KERNEL);
- if (!ns->queue)
- goto out_free_ns;
- ns->queue->queue_flags = QUEUE_FLAG_DEFAULT;
- queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue);
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
- blk_queue_make_request(ns->queue, nvme_make_request);
- ns->dev = dev;
- ns->queue->queuedata = ns;
-
- disk = alloc_disk(NVME_MINORS);
- if (!disk)
- goto out_free_queue;
- ns->ns_id = nsid;
- ns->disk = disk;
- lbaf = id->flbas & 0xf;
- ns->lba_shift = id->lbaf[lbaf].ds;
- blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
- if (dev->max_hw_sectors)
- blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
-
- disk->major = nvme_major;
- disk->minors = NVME_MINORS;
- disk->first_minor = NVME_MINORS * nvme_get_ns_idx();
- disk->fops = &nvme_fops;
- disk->private_data = ns;
- disk->queue = ns->queue;
- disk->driverfs_dev = &dev->pci_dev->dev;
- sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid);
- set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
-
- if (dev->oncs & NVME_CTRL_ONCS_DSM)
- nvme_config_discard(ns);
-
- return ns;
-
- out_free_queue:
- blk_cleanup_queue(ns->queue);
- out_free_ns:
- kfree(ns);
- return NULL;
-}
-
-static void nvme_ns_free(struct nvme_ns *ns)
-{
- int index = ns->disk->first_minor / NVME_MINORS;
- put_disk(ns->disk);
- nvme_put_ns_idx(index);
- blk_cleanup_queue(ns->queue);
- kfree(ns);
-}
-
-static int set_queue_count(struct nvme_dev *dev, int count)
-{
- int status;
- u32 result;
- u32 q_count = (count - 1) | ((count - 1) << 16);
-
- status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0,
- &result);
- if (status)
- return -EIO;
- return min(result & 0xffff, result >> 16) + 1;
-}
-
-static int nvme_setup_io_queues(struct nvme_dev *dev)
-{
- int result, cpu, i, nr_io_queues, db_bar_size, q_depth;
-
- nr_io_queues = num_online_cpus();
- result = set_queue_count(dev, nr_io_queues);
- if (result < 0)
- return result;
- if (result < nr_io_queues)
- nr_io_queues = result;
-
- /* Deregister the admin queue's interrupt */
- free_irq(dev->entry[0].vector, dev->queues[0]);
-
- db_bar_size = 4096 + ((nr_io_queues + 1) << (dev->db_stride + 3));
- if (db_bar_size > 8192) {
- iounmap(dev->bar);
- dev->bar = ioremap(pci_resource_start(dev->pci_dev, 0),
- db_bar_size);
- dev->dbs = ((void __iomem *)dev->bar) + 4096;
- dev->queues[0]->q_db = dev->dbs;
- }
-
- for (i = 0; i < nr_io_queues; i++)
- dev->entry[i].entry = i;
- for (;;) {
- result = pci_enable_msix(dev->pci_dev, dev->entry,
- nr_io_queues);
- if (result == 0) {
- break;
- } else if (result > 0) {
- nr_io_queues = result;
- continue;
- } else {
- nr_io_queues = 1;
- break;
- }
- }
-
- result = queue_request_irq(dev, dev->queues[0], "nvme admin");
- /* XXX: handle failure here */
-
- cpu = cpumask_first(cpu_online_mask);
- for (i = 0; i < nr_io_queues; i++) {
- irq_set_affinity_hint(dev->entry[i].vector, get_cpu_mask(cpu));
- cpu = cpumask_next(cpu, cpu_online_mask);
- }
-
- q_depth = min_t(int, NVME_CAP_MQES(readq(&dev->bar->cap)) + 1,
- NVME_Q_DEPTH);
- for (i = 0; i < nr_io_queues; i++) {
- dev->queues[i + 1] = nvme_create_queue(dev, i + 1, q_depth, i);
- if (IS_ERR(dev->queues[i + 1]))
- return PTR_ERR(dev->queues[i + 1]);
- dev->queue_count++;
- }
-
- for (; i < num_possible_cpus(); i++) {
- int target = i % rounddown_pow_of_two(dev->queue_count - 1);
- dev->queues[i + 1] = dev->queues[target + 1];
- }
-
- return 0;
-}
-
-static void nvme_free_queues(struct nvme_dev *dev)
-{
- int i;
-
- for (i = dev->queue_count - 1; i >= 0; i--)
- nvme_free_queue(dev, i);
-}
-
-static int nvme_dev_add(struct nvme_dev *dev)
-{
- int res, nn, i;
- struct nvme_ns *ns, *next;
- struct nvme_id_ctrl *ctrl;
- struct nvme_id_ns *id_ns;
- void *mem;
- dma_addr_t dma_addr;
-
- res = nvme_setup_io_queues(dev);
- if (res)
- return res;
-
- mem = dma_alloc_coherent(&dev->pci_dev->dev, 8192, &dma_addr,
- GFP_KERNEL);
-
- res = nvme_identify(dev, 0, 1, dma_addr);
- if (res) {
- res = -EIO;
- goto out_free;
- }
-
- ctrl = mem;
- nn = le32_to_cpup(&ctrl->nn);
- dev->oncs = le16_to_cpup(&ctrl->oncs);
- memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
- memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
- memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
- if (ctrl->mdts) {
- int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12;
- dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);
- }
-
- id_ns = mem;
- for (i = 1; i <= nn; i++) {
- res = nvme_identify(dev, i, 0, dma_addr);
- if (res)
- continue;
-
- if (id_ns->ncap == 0)
- continue;
-
- res = nvme_get_features(dev, NVME_FEAT_LBA_RANGE, i,
- dma_addr + 4096, NULL);
- if (res)
- memset(mem + 4096, 0, 4096);
-
- ns = nvme_alloc_ns(dev, i, mem, mem + 4096);
- if (ns)
- list_add_tail(&ns->list, &dev->namespaces);
- }
- list_for_each_entry(ns, &dev->namespaces, list)
- add_disk(ns->disk);
-
- goto out;
-
- out_free:
- list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
- list_del(&ns->list);
- nvme_ns_free(ns);
- }
-
- out:
- dma_free_coherent(&dev->pci_dev->dev, 8192, mem, dma_addr);
- return res;
-}
-
-static int nvme_dev_remove(struct nvme_dev *dev)
-{
- struct nvme_ns *ns, *next;
-
- spin_lock(&dev_list_lock);
- list_del(&dev->node);
- spin_unlock(&dev_list_lock);
-
- list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
- list_del(&ns->list);
- del_gendisk(ns->disk);
- nvme_ns_free(ns);
- }
-
- nvme_free_queues(dev);
-
- return 0;
-}
-
-static int nvme_setup_prp_pools(struct nvme_dev *dev)
-{
- struct device *dmadev = &dev->pci_dev->dev;
- dev->prp_page_pool = dma_pool_create("prp list page", dmadev,
- PAGE_SIZE, PAGE_SIZE, 0);
- if (!dev->prp_page_pool)
- return -ENOMEM;
-
- /* Optimisation for I/Os between 4k and 128k */
- dev->prp_small_pool = dma_pool_create("prp list 256", dmadev,
- 256, 256, 0);
- if (!dev->prp_small_pool) {
- dma_pool_destroy(dev->prp_page_pool);
- return -ENOMEM;
- }
- return 0;
-}
-
-static void nvme_release_prp_pools(struct nvme_dev *dev)
-{
- dma_pool_destroy(dev->prp_page_pool);
- dma_pool_destroy(dev->prp_small_pool);
-}
-
-static DEFINE_IDA(nvme_instance_ida);
-
-static int nvme_set_instance(struct nvme_dev *dev)
-{
- int instance, error;
-
- do {
- if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
- return -ENODEV;
-
- spin_lock(&dev_list_lock);
- error = ida_get_new(&nvme_instance_ida, &instance);
- spin_unlock(&dev_list_lock);
- } while (error == -EAGAIN);
-
- if (error)
- return -ENODEV;
-
- dev->instance = instance;
- return 0;
-}
-
-static void nvme_release_instance(struct nvme_dev *dev)
-{
- spin_lock(&dev_list_lock);
- ida_remove(&nvme_instance_ida, dev->instance);
- spin_unlock(&dev_list_lock);
-}
-
-static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-{
- int bars, result = -ENOMEM;
- struct nvme_dev *dev;
-
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev)
- return -ENOMEM;
- dev->entry = kcalloc(num_possible_cpus(), sizeof(*dev->entry),
- GFP_KERNEL);
- if (!dev->entry)
- goto free;
- dev->queues = kcalloc(num_possible_cpus() + 1, sizeof(void *),
- GFP_KERNEL);
- if (!dev->queues)
- goto free;
-
- if (pci_enable_device_mem(pdev))
- goto free;
- pci_set_master(pdev);
- bars = pci_select_bars(pdev, IORESOURCE_MEM);
- if (pci_request_selected_regions(pdev, bars, "nvme"))
- goto disable;
-
- INIT_LIST_HEAD(&dev->namespaces);
- dev->pci_dev = pdev;
- pci_set_drvdata(pdev, dev);
- dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
- dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
- result = nvme_set_instance(dev);
- if (result)
- goto disable;
-
- dev->entry[0].vector = pdev->irq;
-
- result = nvme_setup_prp_pools(dev);
- if (result)
- goto disable_msix;
-
- dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
- if (!dev->bar) {
- result = -ENOMEM;
- goto disable_msix;
- }
-
- result = nvme_configure_admin_queue(dev);
- if (result)
- goto unmap;
- dev->queue_count++;
-
- spin_lock(&dev_list_lock);
- list_add(&dev->node, &dev_list);
- spin_unlock(&dev_list_lock);
-
- result = nvme_dev_add(dev);
- if (result)
- goto delete;
-
- return 0;
-
- delete:
- spin_lock(&dev_list_lock);
- list_del(&dev->node);
- spin_unlock(&dev_list_lock);
-
- nvme_free_queues(dev);
- unmap:
- iounmap(dev->bar);
- disable_msix:
- pci_disable_msix(pdev);
- nvme_release_instance(dev);
- nvme_release_prp_pools(dev);
- disable:
- pci_disable_device(pdev);
- pci_release_regions(pdev);
- free:
- kfree(dev->queues);
- kfree(dev->entry);
- kfree(dev);
- return result;
-}
-
-static void nvme_remove(struct pci_dev *pdev)
-{
- struct nvme_dev *dev = pci_get_drvdata(pdev);
- nvme_dev_remove(dev);
- pci_disable_msix(pdev);
- iounmap(dev->bar);
- nvme_release_instance(dev);
- nvme_release_prp_pools(dev);
- pci_disable_device(pdev);
- pci_release_regions(pdev);
- kfree(dev->queues);
- kfree(dev->entry);
- kfree(dev);
-}
-
-/* These functions are yet to be implemented */
-#define nvme_error_detected NULL
-#define nvme_dump_registers NULL
-#define nvme_link_reset NULL
-#define nvme_slot_reset NULL
-#define nvme_error_resume NULL
-#define nvme_suspend NULL
-#define nvme_resume NULL
-
-static const struct pci_error_handlers nvme_err_handler = {
- .error_detected = nvme_error_detected,
- .mmio_enabled = nvme_dump_registers,
- .link_reset = nvme_link_reset,
- .slot_reset = nvme_slot_reset,
- .resume = nvme_error_resume,
-};
-
-/* Move to pci_ids.h later */
-#define PCI_CLASS_STORAGE_EXPRESS 0x010802
-
-static DEFINE_PCI_DEVICE_TABLE(nvme_id_table) = {
- { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
- { 0, }
-};
-MODULE_DEVICE_TABLE(pci, nvme_id_table);
-
-static struct pci_driver nvme_driver = {
- .name = "nvme",
- .id_table = nvme_id_table,
- .probe = nvme_probe,
- .remove = nvme_remove,
- .suspend = nvme_suspend,
- .resume = nvme_resume,
- .err_handler = &nvme_err_handler,
-};
-
-static int __init nvme_init(void)
-{
- int result;
-
- nvme_thread = kthread_run(nvme_kthread, NULL, "nvme");
- if (IS_ERR(nvme_thread))
- return PTR_ERR(nvme_thread);
-
- result = register_blkdev(nvme_major, "nvme");
- if (result < 0)
- goto kill_kthread;
- else if (result > 0)
- nvme_major = result;
-
- result = pci_register_driver(&nvme_driver);
- if (result)
- goto unregister_blkdev;
- return 0;
-
- unregister_blkdev:
- unregister_blkdev(nvme_major, "nvme");
- kill_kthread:
- kthread_stop(nvme_thread);
- return result;
-}
-
-static void __exit nvme_exit(void)
-{
- pci_unregister_driver(&nvme_driver);
- unregister_blkdev(nvme_major, "nvme");
- kthread_stop(nvme_thread);
-}
-
-MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
-MODULE_LICENSE("GPL");
-MODULE_VERSION("0.8");
-module_init(nvme_init);
-module_exit(nvme_exit);
projects / linux-2.6-block.git / blobdiff