drivers/scsi/pmcraid.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
   4  *
   5  * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
   6  *             PMC-Sierra Inc
   7  *
   8  * Copyright (C) 2008, 2009 PMC Sierra Inc
   9  */
  10 #include <linux/fs.h>
  11 #include <linux/init.h>
  12 #include <linux/types.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/ioport.h>
  16 #include <linux/delay.h>
  17 #include <linux/pci.h>
  18 #include <linux/wait.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/firmware.h>
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/hdreg.h>
  27 #include <linux/io.h>
  28 #include <linux/slab.h>
  29 #include <asm/irq.h>
  30 #include <asm/processor.h>
  31 #include <linux/libata.h>
  32 #include <linux/mutex.h>
  33 #include <linux/ktime.h>
  34 #include <scsi/scsi.h>
  35 #include <scsi/scsi_host.h>
  36 #include <scsi/scsi_device.h>
  37 #include <scsi/scsi_tcq.h>
  38 #include <scsi/scsi_eh.h>
  39 #include <scsi/scsi_cmnd.h>
  40 #include <scsi/scsicam.h>
  41
  42 #include "pmcraid.h"
  43
  44 /*
  45  *   Module configuration parameters
  46  */
  47 static unsigned int pmcraid_debug_log;
  48 static unsigned int pmcraid_disable_aen;
  49 static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
  50 static unsigned int pmcraid_enable_msix;
  51
  52 /*
  53  * Data structures to support multiple adapters by the LLD.
  54  * pmcraid_adapter_count - count of configured adapters
  55  */
  56 static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
  57
  58 /*
  59  * Supporting user-level control interface through IOCTL commands.
  60  * pmcraid_major - major number to use
  61  * pmcraid_minor - minor number(s) to use
  62  */
  63 static unsigned int pmcraid_major;
  64 static const struct class pmcraid_class = {
  65         .name = PMCRAID_DEVFILE,
  66 };
  67 static DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
  68
  69 /*
  70  * Module parameters
  71  */
  72 MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
  73 MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
  74 MODULE_LICENSE("GPL");
  75 MODULE_VERSION(PMCRAID_DRIVER_VERSION);
  76
  77 module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
  78 MODULE_PARM_DESC(log_level,
  79                  "Enables firmware error code logging, default :1 high-severity"
  80                  " errors, 2: all errors including high-severity errors,"
  81                  " 0: disables logging");
  82
  83 module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
  84 MODULE_PARM_DESC(debug,
  85                  "Enable driver verbose message logging. Set 1 to enable."
  86                  "(default: 0)");
  87
  88 module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
  89 MODULE_PARM_DESC(disable_aen,
  90                  "Disable driver aen notifications to apps. Set 1 to disable."
  91                  "(default: 0)");
  92
  93 /* chip specific constants for PMC MaxRAID controllers (same for
  94  * 0x5220 and 0x8010
  95  */
  96 static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
  97         {
  98          .ioastatus = 0x0,
  99          .ioarrin = 0x00040,
 100          .mailbox = 0x7FC30,
 101          .global_intr_mask = 0x00034,
 102          .ioa_host_intr = 0x0009C,
 103          .ioa_host_intr_clr = 0x000A0,
 104          .ioa_host_msix_intr = 0x7FC40,
 105          .ioa_host_mask = 0x7FC28,
 106          .ioa_host_mask_clr = 0x7FC28,
 107          .host_ioa_intr = 0x00020,
 108          .host_ioa_intr_clr = 0x00020,
 109          .transop_timeout = 300
 110          }
 111 };
 112
 113 /*
 114  * PCI device ids supported by pmcraid driver
 115  */
 116 static struct pci_device_id pmcraid_pci_table[] = {
 117         { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
 118           0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
 119         },
 120         {}
 121 };
 122
 123 MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
 124
 125
 126
 127 /**
 128  * pmcraid_slave_alloc - Prepare for commands to a device
 129  * @scsi_dev: scsi device struct
 130  *
 131  * This function is called by mid-layer prior to sending any command to the new
 132  * device. Stores resource entry details of the device in scsi_device struct.
 133  * Queuecommand uses the resource handle and other details to fill up IOARCB
 134  * while sending commands to the device.
 135  *
 136  * Return value:
 137  *        0 on success / -ENXIO if device does not exist
 138  */
 139 static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
 140 {
 141         struct pmcraid_resource_entry *temp, *res = NULL;
 142         struct pmcraid_instance *pinstance;
 143         u8 target, bus, lun;
 144         unsigned long lock_flags;
 145         int rc = -ENXIO;
 146         u16 fw_version;
 147
 148         pinstance = shost_priv(scsi_dev->host);
 149
 150         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
 151
 152         /* Driver exposes VSET and GSCSI resources only; all other device types
 153          * are not exposed. Resource list is synchronized using resource lock
 154          * so any traversal or modifications to the list should be done inside
 155          * this lock
 156          */
 157         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
 158         list_for_each_entry(temp, &pinstance->used_res_q, queue) {
 159
 160                 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
 161                 if (RES_IS_VSET(temp->cfg_entry)) {
 162                         if (fw_version <= PMCRAID_FW_VERSION_1)
 163                                 target = temp->cfg_entry.unique_flags1;
 164                         else
 165                                 target = le16_to_cpu(temp->cfg_entry.array_id) & 0xFF;
 166
 167                         if (target > PMCRAID_MAX_VSET_TARGETS)
 168                                 continue;
 169                         bus = PMCRAID_VSET_BUS_ID;
 170                         lun = 0;
 171                 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
 172                         target = RES_TARGET(temp->cfg_entry.resource_address);
 173                         bus = PMCRAID_PHYS_BUS_ID;
 174                         lun = RES_LUN(temp->cfg_entry.resource_address);
 175                 } else {
 176                         continue;
 177                 }
 178
 179                 if (bus == scsi_dev->channel &&
 180                     target == scsi_dev->id &&
 181                     lun == scsi_dev->lun) {
 182                         res = temp;
 183                         break;
 184                 }
 185         }
 186
 187         if (res) {
 188                 res->scsi_dev = scsi_dev;
 189                 scsi_dev->hostdata = res;
 190                 res->change_detected = 0;
 191                 atomic_set(&res->read_failures, 0);
 192                 atomic_set(&res->write_failures, 0);
 193                 rc = 0;
 194         }
 195         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
 196         return rc;
 197 }
 198
 199 /**
 200  * pmcraid_device_configure - Configures a SCSI device
 201  * @scsi_dev: scsi device struct
 202  * @lim: queue limits
 203  *
 204  * This function is executed by SCSI mid layer just after a device is first
 205  * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
 206  * timeout value (default 30s) will be over-written to a higher value (60s)
 207  * and max_sectors value will be over-written to 512. It also sets queue depth
 208  * to host->cmd_per_lun value
 209  *
 210  * Return value:
 211  *        0 on success
 212  */
 213 static int pmcraid_device_configure(struct scsi_device *scsi_dev,
 214                 struct queue_limits *lim)
 215 {
 216         struct pmcraid_resource_entry *res = scsi_dev->hostdata;
 217
 218         if (!res)
 219                 return 0;
 220
 221         /* LLD exposes VSETs and Enclosure devices only */
 222         if (RES_IS_GSCSI(res->cfg_entry) &&
 223             scsi_dev->type != TYPE_ENCLOSURE)
 224                 return -ENXIO;
 225
 226         pmcraid_info("configuring %x:%x:%x:%x\n",
 227                      scsi_dev->host->unique_id,
 228                      scsi_dev->channel,
 229                      scsi_dev->id,
 230                      (u8)scsi_dev->lun);
 231
 232         if (RES_IS_GSCSI(res->cfg_entry)) {
 233                 scsi_dev->allow_restart = 1;
 234         } else if (RES_IS_VSET(res->cfg_entry)) {
 235                 scsi_dev->allow_restart = 1;
 236                 blk_queue_rq_timeout(scsi_dev->request_queue,
 237                                      PMCRAID_VSET_IO_TIMEOUT);
 238                 lim->max_hw_sectors = PMCRAID_VSET_MAX_SECTORS;
 239         }
 240
 241         /*
 242          * We never want to report TCQ support for these types of devices.
 243          */
 244         if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
 245                 scsi_dev->tagged_supported = 0;
 246
 247         return 0;
 248 }
 249
 250 /**
 251  * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
 252  *
 253  * @scsi_dev: scsi device struct
 254  *
 255  * This is called by mid-layer before removing a device. Pointer assignments
 256  * done in pmcraid_slave_alloc will be reset to NULL here.
 257  *
 258  * Return value
 259  *   none
 260  */
 261 static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
 262 {
 263         struct pmcraid_resource_entry *res;
 264
 265         res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
 266
 267         if (res)
 268                 res->scsi_dev = NULL;
 269
 270         scsi_dev->hostdata = NULL;
 271 }
 272
 273 /**
 274  * pmcraid_change_queue_depth - Change the device's queue depth
 275  * @scsi_dev: scsi device struct
 276  * @depth: depth to set
 277  *
 278  * Return value
 279  *      actual depth set
 280  */
 281 static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
 282 {
 283         if (depth > PMCRAID_MAX_CMD_PER_LUN)
 284                 depth = PMCRAID_MAX_CMD_PER_LUN;
 285         return scsi_change_queue_depth(scsi_dev, depth);
 286 }
 287
 288 /**
 289  * pmcraid_init_cmdblk - initializes a command block
 290  *
 291  * @cmd: pointer to struct pmcraid_cmd to be initialized
 292  * @index: if >=0 first time initialization; otherwise reinitialization
 293  *
 294  * Return Value
 295  *       None
 296  */
 297 static void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
 298 {
 299         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
 300         dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
 301
 302         if (index >= 0) {
 303                 /* first time initialization (called from  probe) */
 304                 u32 ioasa_offset =
 305                         offsetof(struct pmcraid_control_block, ioasa);
 306
 307                 cmd->index = index;
 308                 ioarcb->response_handle = cpu_to_le32(index << 2);
 309                 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
 310                 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
 311                 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
 312         } else {
 313                 /* re-initialization of various lengths, called once command is
 314                  * processed by IOA
 315                  */
 316                 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
 317                 ioarcb->hrrq_id = 0;
 318                 ioarcb->request_flags0 = 0;
 319                 ioarcb->request_flags1 = 0;
 320                 ioarcb->cmd_timeout = 0;
 321                 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
 322                 ioarcb->ioadl_bus_addr = 0;
 323                 ioarcb->ioadl_length = 0;
 324                 ioarcb->data_transfer_length = 0;
 325                 ioarcb->add_cmd_param_length = 0;
 326                 ioarcb->add_cmd_param_offset = 0;
 327                 cmd->ioa_cb->ioasa.ioasc = 0;
 328                 cmd->ioa_cb->ioasa.residual_data_length = 0;
 329                 cmd->time_left = 0;
 330         }
 331
 332         cmd->cmd_done = NULL;
 333         cmd->scsi_cmd = NULL;
 334         cmd->release = 0;
 335         cmd->completion_req = 0;
 336         cmd->sense_buffer = NULL;
 337         cmd->sense_buffer_dma = 0;
 338         cmd->dma_handle = 0;
 339         timer_setup(&cmd->timer, NULL, 0);
 340 }
 341
 342 /**
 343  * pmcraid_reinit_cmdblk - reinitialize a command block
 344  *
 345  * @cmd: pointer to struct pmcraid_cmd to be reinitialized
 346  *
 347  * Return Value
 348  *       None
 349  */
 350 static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
 351 {
 352         pmcraid_init_cmdblk(cmd, -1);
 353 }
 354
 355 /**
 356  * pmcraid_get_free_cmd - get a free cmd block from command block pool
 357  * @pinstance: adapter instance structure
 358  *
 359  * Return Value:
 360  *      returns pointer to cmd block or NULL if no blocks are available
 361  */
 362 static struct pmcraid_cmd *pmcraid_get_free_cmd(
 363         struct pmcraid_instance *pinstance
 364 )
 365 {
 366         struct pmcraid_cmd *cmd = NULL;
 367         unsigned long lock_flags;
 368
 369         /* free cmd block list is protected by free_pool_lock */
 370         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
 371
 372         if (!list_empty(&pinstance->free_cmd_pool)) {
 373                 cmd = list_entry(pinstance->free_cmd_pool.next,
 374                                  struct pmcraid_cmd, free_list);
 375                 list_del(&cmd->free_list);
 376         }
 377         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
 378
 379         /* Initialize the command block before giving it the caller */
 380         if (cmd != NULL)
 381                 pmcraid_reinit_cmdblk(cmd);
 382         return cmd;
 383 }
 384
 385 /**
 386  * pmcraid_return_cmd - return a completed command block back into free pool
 387  * @cmd: pointer to the command block
 388  *
 389  * Return Value:
 390  *      nothing
 391  */
 392 static void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
 393 {
 394         struct pmcraid_instance *pinstance = cmd->drv_inst;
 395         unsigned long lock_flags;
 396
 397         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
 398         list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
 399         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
 400 }
 401
 402 /**
 403  * pmcraid_read_interrupts -  reads IOA interrupts
 404  *
 405  * @pinstance: pointer to adapter instance structure
 406  *
 407  * Return value
 408  *       interrupts read from IOA
 409  */
 410 static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
 411 {
 412         return (pinstance->interrupt_mode) ?
 413                 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
 414                 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 415 }
 416
 417 /**
 418  * pmcraid_disable_interrupts - Masks and clears all specified interrupts
 419  *
 420  * @pinstance: pointer to per adapter instance structure
 421  * @intrs: interrupts to disable
 422  *
 423  * Return Value
 424  *       None
 425  */
 426 static void pmcraid_disable_interrupts(
 427         struct pmcraid_instance *pinstance,
 428         u32 intrs
 429 )
 430 {
 431         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 432         u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
 433
 434         iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
 435         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
 436         ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 437
 438         if (!pinstance->interrupt_mode) {
 439                 iowrite32(intrs,
 440                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
 441                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 442         }
 443 }
 444
 445 /**
 446  * pmcraid_enable_interrupts - Enables specified interrupts
 447  *
 448  * @pinstance: pointer to per adapter instance structure
 449  * @intrs: interrupts to enable
 450  *
 451  * Return Value
 452  *       None
 453  */
 454 static void pmcraid_enable_interrupts(
 455         struct pmcraid_instance *pinstance,
 456         u32 intrs)
 457 {
 458         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 459         u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
 460
 461         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
 462
 463         if (!pinstance->interrupt_mode) {
 464                 iowrite32(~intrs,
 465                          pinstance->int_regs.ioa_host_interrupt_mask_reg);
 466                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 467         }
 468
 469         pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
 470                 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
 471                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
 472 }
 473
 474 /**
 475  * pmcraid_clr_trans_op - clear trans to op interrupt
 476  *
 477  * @pinstance: pointer to per adapter instance structure
 478  *
 479  * Return Value
 480  *       None
 481  */
 482 static void pmcraid_clr_trans_op(
 483         struct pmcraid_instance *pinstance
 484 )
 485 {
 486         unsigned long lock_flags;
 487
 488         if (!pinstance->interrupt_mode) {
 489                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
 490                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
 491                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 492                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
 493                         pinstance->int_regs.ioa_host_interrupt_clr_reg);
 494                 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
 495         }
 496
 497         if (pinstance->reset_cmd != NULL) {
 498                 del_timer(&pinstance->reset_cmd->timer);
 499                 spin_lock_irqsave(
 500                         pinstance->host->host_lock, lock_flags);
 501                 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
 502                 spin_unlock_irqrestore(
 503                         pinstance->host->host_lock, lock_flags);
 504         }
 505 }
 506
 507 /**
 508  * pmcraid_reset_type - Determine the required reset type
 509  * @pinstance: pointer to adapter instance structure
 510  *
 511  * IOA requires hard reset if any of the following conditions is true.
 512  * 1. If HRRQ valid interrupt is not masked
 513  * 2. IOA reset alert doorbell is set
 514  * 3. If there are any error interrupts
 515  */
 516 static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
 517 {
 518         u32 mask;
 519         u32 intrs;
 520         u32 alerts;
 521
 522         mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 523         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 524         alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 525
 526         if ((mask & INTRS_HRRQ_VALID) == 0 ||
 527             (alerts & DOORBELL_IOA_RESET_ALERT) ||
 528             (intrs & PMCRAID_ERROR_INTERRUPTS)) {
 529                 pmcraid_info("IOA requires hard reset\n");
 530                 pinstance->ioa_hard_reset = 1;
 531         }
 532
 533         /* If unit check is active, trigger the dump */
 534         if (intrs & INTRS_IOA_UNIT_CHECK)
 535                 pinstance->ioa_unit_check = 1;
 536 }
 537
 538 static void pmcraid_ioa_reset(struct pmcraid_cmd *);
 539 /**
 540  * pmcraid_bist_done - completion function for PCI BIST
 541  * @t: pointer to reset command
 542  * Return Value
 543  *      none
 544  */
 545 static void pmcraid_bist_done(struct timer_list *t)
 546 {
 547         struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
 548         struct pmcraid_instance *pinstance = cmd->drv_inst;
 549         unsigned long lock_flags;
 550         int rc;
 551         u16 pci_reg;
 552
 553         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 554
 555         /* If PCI config space can't be accessed wait for another two secs */
 556         if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
 557             cmd->time_left > 0) {
 558                 pmcraid_info("BIST not complete, waiting another 2 secs\n");
 559                 cmd->timer.expires = jiffies + cmd->time_left;
 560                 cmd->time_left = 0;
 561                 add_timer(&cmd->timer);
 562         } else {
 563                 cmd->time_left = 0;
 564                 pmcraid_info("BIST is complete, proceeding with reset\n");
 565                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 566                 pmcraid_ioa_reset(cmd);
 567                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 568         }
 569 }
 570
 571 /**
 572  * pmcraid_start_bist - starts BIST
 573  * @cmd: pointer to reset cmd
 574  * Return Value
 575  *   none
 576  */
 577 static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
 578 {
 579         struct pmcraid_instance *pinstance = cmd->drv_inst;
 580         u32 doorbells, intrs;
 581
 582         /* proceed with bist and wait for 2 seconds */
 583         iowrite32(DOORBELL_IOA_START_BIST,
 584                 pinstance->int_regs.host_ioa_interrupt_reg);
 585         doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 586         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 587         pmcraid_info("doorbells after start bist: %x intrs: %x\n",
 588                       doorbells, intrs);
 589
 590         cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
 591         cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
 592         cmd->timer.function = pmcraid_bist_done;
 593         add_timer(&cmd->timer);
 594 }
 595
 596 /**
 597  * pmcraid_reset_alert_done - completion routine for reset_alert
 598  * @t: pointer to command block used in reset sequence
 599  * Return value
 600  *  None
 601  */
 602 static void pmcraid_reset_alert_done(struct timer_list *t)
 603 {
 604         struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
 605         struct pmcraid_instance *pinstance = cmd->drv_inst;
 606         u32 status = ioread32(pinstance->ioa_status);
 607         unsigned long lock_flags;
 608
 609         /* if the critical operation in progress bit is set or the wait times
 610          * out, invoke reset engine to proceed with hard reset. If there is
 611          * some more time to wait, restart the timer
 612          */
 613         if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
 614             cmd->time_left <= 0) {
 615                 pmcraid_info("critical op is reset proceeding with reset\n");
 616                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 617                 pmcraid_ioa_reset(cmd);
 618                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 619         } else {
 620                 pmcraid_info("critical op is not yet reset waiting again\n");
 621                 /* restart timer if some more time is available to wait */
 622                 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
 623                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
 624                 cmd->timer.function = pmcraid_reset_alert_done;
 625                 add_timer(&cmd->timer);
 626         }
 627 }
 628
 629 static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
 630 /**
 631  * pmcraid_reset_alert - alerts IOA for a possible reset
 632  * @cmd: command block to be used for reset sequence.
 633  *
 634  * Return Value
 635  *      returns 0 if pci config-space is accessible and RESET_DOORBELL is
 636  *      successfully written to IOA. Returns non-zero in case pci_config_space
 637  *      is not accessible
 638  */
 639 static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
 640 {
 641         struct pmcraid_instance *pinstance = cmd->drv_inst;
 642         u32 doorbells;
 643         int rc;
 644         u16 pci_reg;
 645
 646         /* If we are able to access IOA PCI config space, alert IOA that we are
 647          * going to reset it soon. This enables IOA to preserv persistent error
 648          * data if any. In case memory space is not accessible, proceed with
 649          * BIST or slot_reset
 650          */
 651         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 652         if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
 653
 654                 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
 655                  * reset IOA doesn't generate any interrupts when CRITICAL
 656                  * OPERATION bit is reset. A timer is started to wait for this
 657                  * bit to be reset.
 658                  */
 659                 cmd->time_left = PMCRAID_RESET_TIMEOUT;
 660                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
 661                 cmd->timer.function = pmcraid_reset_alert_done;
 662                 add_timer(&cmd->timer);
 663
 664                 iowrite32(DOORBELL_IOA_RESET_ALERT,
 665                         pinstance->int_regs.host_ioa_interrupt_reg);
 666                 doorbells =
 667                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 668                 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
 669         } else {
 670                 pmcraid_info("PCI config is not accessible starting BIST\n");
 671                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
 672                 pmcraid_start_bist(cmd);
 673         }
 674 }
 675
 676 /**
 677  * pmcraid_timeout_handler -  Timeout handler for internally generated ops
 678  *
 679  * @t: pointer to command structure, that got timedout
 680  *
 681  * This function blocks host requests and initiates an adapter reset.
 682  *
 683  * Return value:
 684  *   None
 685  */
 686 static void pmcraid_timeout_handler(struct timer_list *t)
 687 {
 688         struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
 689         struct pmcraid_instance *pinstance = cmd->drv_inst;
 690         unsigned long lock_flags;
 691
 692         dev_info(&pinstance->pdev->dev,
 693                 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
 694                 cmd->ioa_cb->ioarcb.cdb[0]);
 695
 696         /* Command timeouts result in hard reset sequence. The command that got
 697          * timed out may be the one used as part of reset sequence. In this
 698          * case restart reset sequence using the same command block even if
 699          * reset is in progress. Otherwise fail this command and get a free
 700          * command block to restart the reset sequence.
 701          */
 702         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 703         if (!pinstance->ioa_reset_in_progress) {
 704                 pinstance->ioa_reset_attempts = 0;
 705                 cmd = pmcraid_get_free_cmd(pinstance);
 706
 707                 /* If we are out of command blocks, just return here itself.
 708                  * Some other command's timeout handler can do the reset job
 709                  */
 710                 if (cmd == NULL) {
 711                         spin_unlock_irqrestore(pinstance->host->host_lock,
 712                                                lock_flags);
 713                         pmcraid_err("no free cmnd block for timeout handler\n");
 714                         return;
 715                 }
 716
 717                 pinstance->reset_cmd = cmd;
 718                 pinstance->ioa_reset_in_progress = 1;
 719         } else {
 720                 pmcraid_info("reset is already in progress\n");
 721
 722                 if (pinstance->reset_cmd != cmd) {
 723                         /* This command should have been given to IOA, this
 724                          * command will be completed by fail_outstanding_cmds
 725                          * anyway
 726                          */
 727                         pmcraid_err("cmd is pending but reset in progress\n");
 728                 }
 729
 730                 /* If this command was being used as part of the reset
 731                  * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
 732                  * causes fail_outstanding_commands not to return the command
 733                  * block back to free pool
 734                  */
 735                 if (cmd == pinstance->reset_cmd)
 736                         cmd->cmd_done = pmcraid_ioa_reset;
 737         }
 738
 739         /* Notify apps of important IOA bringup/bringdown sequences */
 740         if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
 741             pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
 742                 pmcraid_notify_ioastate(pinstance,
 743                                         PMC_DEVICE_EVENT_RESET_START);
 744
 745         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
 746         scsi_block_requests(pinstance->host);
 747         pmcraid_reset_alert(cmd);
 748         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 749 }
 750
 751 /**
 752  * pmcraid_internal_done - completion routine for internally generated cmds
 753  *
 754  * @cmd: command that got response from IOA
 755  *
 756  * Return Value:
 757  *       none
 758  */
 759 static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
 760 {
 761         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
 762                      cmd->ioa_cb->ioarcb.cdb[0],
 763                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 764
 765         /* Some of the internal commands are sent with callers blocking for the
 766          * response. Same will be indicated as part of cmd->completion_req
 767          * field. Response path needs to wake up any waiters waiting for cmd
 768          * completion if this flag is set.
 769          */
 770         if (cmd->completion_req) {
 771                 cmd->completion_req = 0;
 772                 complete(&cmd->wait_for_completion);
 773         }
 774
 775         /* most of the internal commands are completed by caller itself, so
 776          * no need to return the command block back to free pool until we are
 777          * required to do so (e.g once done with initialization).
 778          */
 779         if (cmd->release) {
 780                 cmd->release = 0;
 781                 pmcraid_return_cmd(cmd);
 782         }
 783 }
 784
 785 /**
 786  * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
 787  *
 788  * @cmd: command that got response from IOA
 789  *
 790  * This routine is called after driver re-reads configuration table due to a
 791  * lost CCN. It returns the command block back to free pool and schedules
 792  * worker thread to add/delete devices into the system.
 793  *
 794  * Return Value:
 795  *       none
 796  */
 797 static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
 798 {
 799         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
 800                      cmd->ioa_cb->ioarcb.cdb[0],
 801                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 802
 803         if (cmd->release) {
 804                 cmd->release = 0;
 805                 pmcraid_return_cmd(cmd);
 806         }
 807         pmcraid_info("scheduling worker for config table reinitialization\n");
 808         schedule_work(&cmd->drv_inst->worker_q);
 809 }
 810
 811 /**
 812  * pmcraid_erp_done - Process completion of SCSI error response from device
 813  * @cmd: pmcraid_command
 814  *
 815  * This function copies the sense buffer into the scsi_cmd struct and completes
 816  * scsi_cmd by calling scsi_done function.
 817  *
 818  * Return value:
 819  *  none
 820  */
 821 static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
 822 {
 823         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
 824         struct pmcraid_instance *pinstance = cmd->drv_inst;
 825         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
 826
 827         if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
 828                 scsi_cmd->result |= (DID_ERROR << 16);
 829                 scmd_printk(KERN_INFO, scsi_cmd,
 830                             "command CDB[0] = %x failed with IOASC: 0x%08X\n",
 831                             cmd->ioa_cb->ioarcb.cdb[0], ioasc);
 832         }
 833
 834         if (cmd->sense_buffer) {
 835                 dma_unmap_single(&pinstance->pdev->dev, cmd->sense_buffer_dma,
 836                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 837                 cmd->sense_buffer = NULL;
 838                 cmd->sense_buffer_dma = 0;
 839         }
 840
 841         scsi_dma_unmap(scsi_cmd);
 842         pmcraid_return_cmd(cmd);
 843         scsi_done(scsi_cmd);
 844 }
 845
 846 /**
 847  * _pmcraid_fire_command - sends an IOA command to adapter
 848  *
 849  * This function adds the given block into pending command list
 850  * and returns without waiting
 851  *
 852  * @cmd : command to be sent to the device
 853  *
 854  * Return Value
 855  *      None
 856  */
 857 static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
 858 {
 859         struct pmcraid_instance *pinstance = cmd->drv_inst;
 860         unsigned long lock_flags;
 861
 862         /* Add this command block to pending cmd pool. We do this prior to
 863          * writting IOARCB to ioarrin because IOA might complete the command
 864          * by the time we are about to add it to the list. Response handler
 865          * (isr/tasklet) looks for cmd block in the pending pending list.
 866          */
 867         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
 868         list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
 869         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
 870         atomic_inc(&pinstance->outstanding_cmds);
 871
 872         /* driver writes lower 32-bit value of IOARCB address only */
 873         mb();
 874         iowrite32(le64_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr), pinstance->ioarrin);
 875 }
 876
 877 /**
 878  * pmcraid_send_cmd - fires a command to IOA
 879  *
 880  * This function also sets up timeout function, and command completion
 881  * function
 882  *
 883  * @cmd: pointer to the command block to be fired to IOA
 884  * @cmd_done: command completion function, called once IOA responds
 885  * @timeout: timeout to wait for this command completion
 886  * @timeout_func: timeout handler
 887  *
 888  * Return value
 889  *   none
 890  */
 891 static void pmcraid_send_cmd(
 892         struct pmcraid_cmd *cmd,
 893         void (*cmd_done) (struct pmcraid_cmd *),
 894         unsigned long timeout,
 895         void (*timeout_func) (struct timer_list *)
 896 )
 897 {
 898         /* initialize done function */
 899         cmd->cmd_done = cmd_done;
 900
 901         if (timeout_func) {
 902                 /* setup timeout handler */
 903                 cmd->timer.expires = jiffies + timeout;
 904                 cmd->timer.function = timeout_func;
 905                 add_timer(&cmd->timer);
 906         }
 907
 908         /* fire the command to IOA */
 909         _pmcraid_fire_command(cmd);
 910 }
 911
 912 /**
 913  * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
 914  * @cmd: pointer to the command block used for sending IOA shutdown command
 915  *
 916  * Return value
 917  *  None
 918  */
 919 static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
 920 {
 921         struct pmcraid_instance *pinstance = cmd->drv_inst;
 922         unsigned long lock_flags;
 923
 924         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 925         pmcraid_ioa_reset(cmd);
 926         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 927 }
 928
 929 /**
 930  * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
 931  *
 932  * @cmd: pointer to the command block used as part of reset sequence
 933  *
 934  * Return Value
 935  *  None
 936  */
 937 static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
 938 {
 939         pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
 940                      cmd->ioa_cb->ioarcb.cdb[0],
 941                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 942
 943         /* Note that commands sent during reset require next command to be sent
 944          * to IOA. Hence reinit the done function as well as timeout function
 945          */
 946         pmcraid_reinit_cmdblk(cmd);
 947         cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
 948         cmd->ioa_cb->ioarcb.resource_handle =
 949                 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
 950         cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
 951         cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
 952
 953         /* fire shutdown command to hardware. */
 954         pmcraid_info("firing normal shutdown command (%d) to IOA\n",
 955                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
 956
 957         pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
 958
 959         pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
 960                          PMCRAID_SHUTDOWN_TIMEOUT,
 961                          pmcraid_timeout_handler);
 962 }
 963
 964 static void pmcraid_querycfg(struct pmcraid_cmd *);
 965 /**
 966  * pmcraid_get_fwversion_done - completion function for get_fwversion
 967  *
 968  * @cmd: pointer to command block used to send INQUIRY command
 969  *
 970  * Return Value
 971  *      none
 972  */
 973 static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
 974 {
 975         struct pmcraid_instance *pinstance = cmd->drv_inst;
 976         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
 977         unsigned long lock_flags;
 978
 979         /* configuration table entry size depends on firmware version. If fw
 980          * version is not known, it is not possible to interpret IOA config
 981          * table
 982          */
 983         if (ioasc) {
 984                 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
 985                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 986                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
 987                 pmcraid_reset_alert(cmd);
 988                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 989         } else  {
 990                 pmcraid_querycfg(cmd);
 991         }
 992 }
 993
 994 /**
 995  * pmcraid_get_fwversion - reads firmware version information
 996  *
 997  * @cmd: pointer to command block used to send INQUIRY command
 998  *
 999  * Return Value
1000  *      none
1001  */
1002 static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1003 {
1004         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1005         struct pmcraid_ioadl_desc *ioadl;
1006         struct pmcraid_instance *pinstance = cmd->drv_inst;
1007         u16 data_size = sizeof(struct pmcraid_inquiry_data);
1008
1009         pmcraid_reinit_cmdblk(cmd);
1010         ioarcb->request_type = REQ_TYPE_SCSI;
1011         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1012         ioarcb->cdb[0] = INQUIRY;
1013         ioarcb->cdb[1] = 1;
1014         ioarcb->cdb[2] = 0xD0;
1015         ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1016         ioarcb->cdb[4] = data_size & 0xFF;
1017
1018         /* Since entire inquiry data it can be part of IOARCB itself
1019          */
1020         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1021                                         offsetof(struct pmcraid_ioarcb,
1022                                                 add_data.u.ioadl[0]));
1023         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1024         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
1025
1026         ioarcb->request_flags0 |= NO_LINK_DESCS;
1027         ioarcb->data_transfer_length = cpu_to_le32(data_size);
1028         ioadl = &(ioarcb->add_data.u.ioadl[0]);
1029         ioadl->flags = IOADL_FLAGS_LAST_DESC;
1030         ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1031         ioadl->data_len = cpu_to_le32(data_size);
1032
1033         pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1034                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1035 }
1036
1037 /**
1038  * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1039  * @cmd: pointer to command block to be used for identify hrrq
1040  *
1041  * Return Value
1042  *       none
1043  */
1044 static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1045 {
1046         struct pmcraid_instance *pinstance = cmd->drv_inst;
1047         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1048         int index = cmd->hrrq_index;
1049         __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1050         __be32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1051         void (*done_function)(struct pmcraid_cmd *);
1052
1053         pmcraid_reinit_cmdblk(cmd);
1054         cmd->hrrq_index = index + 1;
1055
1056         if (cmd->hrrq_index < pinstance->num_hrrq) {
1057                 done_function = pmcraid_identify_hrrq;
1058         } else {
1059                 cmd->hrrq_index = 0;
1060                 done_function = pmcraid_get_fwversion;
1061         }
1062
1063         /* Initialize ioarcb */
1064         ioarcb->request_type = REQ_TYPE_IOACMD;
1065         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1066
1067         /* initialize the hrrq number where IOA will respond to this command */
1068         ioarcb->hrrq_id = index;
1069         ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1070         ioarcb->cdb[1] = index;
1071
1072         /* IOA expects 64-bit pci address to be written in B.E format
1073          * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1074          */
1075         pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1076                      hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1077
1078         memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1079         memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1080
1081         /* Subsequent commands require HRRQ identification to be successful.
1082          * Note that this gets called even during reset from SCSI mid-layer
1083          * or tasklet
1084          */
1085         pmcraid_send_cmd(cmd, done_function,
1086                          PMCRAID_INTERNAL_TIMEOUT,
1087                          pmcraid_timeout_handler);
1088 }
1089
1090 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1091 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1092
1093 /**
1094  * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1095  *
1096  * @cmd: initialized command block pointer
1097  *
1098  * Return Value
1099  *   none
1100  */
1101 static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1102 {
1103         if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1104                 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1105         else
1106                 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1107
1108         pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1109 }
1110
1111 /**
1112  * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1113  *
1114  * @pinstance: pointer to adapter instance structure
1115  * @type: HCAM type
1116  *
1117  * Return Value
1118  *   pointer to initialized pmcraid_cmd structure or NULL
1119  */
1120 static struct pmcraid_cmd *pmcraid_init_hcam
1121 (
1122         struct pmcraid_instance *pinstance,
1123         u8 type
1124 )
1125 {
1126         struct pmcraid_cmd *cmd;
1127         struct pmcraid_ioarcb *ioarcb;
1128         struct pmcraid_ioadl_desc *ioadl;
1129         struct pmcraid_hostrcb *hcam;
1130         void (*cmd_done) (struct pmcraid_cmd *);
1131         dma_addr_t dma;
1132         int rcb_size;
1133
1134         cmd = pmcraid_get_free_cmd(pinstance);
1135
1136         if (!cmd) {
1137                 pmcraid_err("no free command blocks for hcam\n");
1138                 return cmd;
1139         }
1140
1141         if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1142                 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1143                 cmd_done = pmcraid_process_ccn;
1144                 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1145                 hcam = &pinstance->ccn;
1146         } else {
1147                 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1148                 cmd_done = pmcraid_process_ldn;
1149                 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1150                 hcam = &pinstance->ldn;
1151         }
1152
1153         /* initialize command pointer used for HCAM registration */
1154         hcam->cmd = cmd;
1155
1156         ioarcb = &cmd->ioa_cb->ioarcb;
1157         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1158                                         offsetof(struct pmcraid_ioarcb,
1159                                                 add_data.u.ioadl[0]));
1160         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1161         ioadl = ioarcb->add_data.u.ioadl;
1162
1163         /* Initialize ioarcb */
1164         ioarcb->request_type = REQ_TYPE_HCAM;
1165         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1166         ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1167         ioarcb->cdb[1] = type;
1168         ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1169         ioarcb->cdb[8] = (rcb_size) & 0xFF;
1170
1171         ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1172
1173         ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1174         ioadl[0].data_len = cpu_to_le32(rcb_size);
1175         ioadl[0].address = cpu_to_le64(dma);
1176
1177         cmd->cmd_done = cmd_done;
1178         return cmd;
1179 }
1180
1181 /**
1182  * pmcraid_send_hcam - Send an HCAM to IOA
1183  * @pinstance: ioa config struct
1184  * @type: HCAM type
1185  *
1186  * This function will send a Host Controlled Async command to IOA.
1187  *
1188  * Return value:
1189  *      none
1190  */
1191 static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1192 {
1193         struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1194         pmcraid_send_hcam_cmd(cmd);
1195 }
1196
1197
1198 /**
1199  * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1200  *
1201  * @cmd: pointer to cmd that is used as cancelling command
1202  * @cmd_to_cancel: pointer to the command that needs to be cancelled
1203  */
1204 static void pmcraid_prepare_cancel_cmd(
1205         struct pmcraid_cmd *cmd,
1206         struct pmcraid_cmd *cmd_to_cancel
1207 )
1208 {
1209         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1210         __be64 ioarcb_addr;
1211
1212         /* IOARCB address of the command to be cancelled is given in
1213          * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1214          * IOARCB address are not masked.
1215          */
1216         ioarcb_addr = cpu_to_be64(le64_to_cpu(cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr));
1217
1218         /* Get the resource handle to where the command to be aborted has been
1219          * sent.
1220          */
1221         ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1222         ioarcb->request_type = REQ_TYPE_IOACMD;
1223         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1224         ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1225
1226         memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1227 }
1228
1229 /**
1230  * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1231  *
1232  * @cmd: command to be used as cancelling command
1233  * @type: HCAM type
1234  * @cmd_done: op done function for the cancelling command
1235  */
1236 static void pmcraid_cancel_hcam(
1237         struct pmcraid_cmd *cmd,
1238         u8 type,
1239         void (*cmd_done) (struct pmcraid_cmd *)
1240 )
1241 {
1242         struct pmcraid_instance *pinstance;
1243         struct pmcraid_hostrcb  *hcam;
1244
1245         pinstance = cmd->drv_inst;
1246         hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1247                 &pinstance->ldn : &pinstance->ccn;
1248
1249         /* prepare for cancelling previous hcam command. If the HCAM is
1250          * currently not pending with IOA, we would have hcam->cmd as non-null
1251          */
1252         if (hcam->cmd == NULL)
1253                 return;
1254
1255         pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1256
1257         /* writing to IOARRIN must be protected by host_lock, as mid-layer
1258          * schedule queuecommand while we are doing this
1259          */
1260         pmcraid_send_cmd(cmd, cmd_done,
1261                          PMCRAID_INTERNAL_TIMEOUT,
1262                          pmcraid_timeout_handler);
1263 }
1264
1265 /**
1266  * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1267  *
1268  * @cmd: command block to be used for cancelling the HCAM
1269  */
1270 static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1271 {
1272         pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1273                      cmd->ioa_cb->ioarcb.cdb[0],
1274                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1275
1276         pmcraid_reinit_cmdblk(cmd);
1277
1278         pmcraid_cancel_hcam(cmd,
1279                             PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1280                             pmcraid_ioa_shutdown);
1281 }
1282
1283 /**
1284  * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1285  *
1286  * @cmd: command block to be used for cancelling the HCAM
1287  */
1288 static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1289 {
1290         pmcraid_cancel_hcam(cmd,
1291                             PMCRAID_HCAM_CODE_LOG_DATA,
1292                             pmcraid_cancel_ccn);
1293 }
1294
1295 /**
1296  * pmcraid_expose_resource - check if the resource can be exposed to OS
1297  *
1298  * @fw_version: firmware version code
1299  * @cfgte: pointer to configuration table entry of the resource
1300  *
1301  * Return value:
1302  *      true if resource can be added to midlayer, false(0) otherwise
1303  */
1304 static int pmcraid_expose_resource(u16 fw_version,
1305                                    struct pmcraid_config_table_entry *cfgte)
1306 {
1307         int retval = 0;
1308
1309         if (cfgte->resource_type == RES_TYPE_VSET) {
1310                 if (fw_version <= PMCRAID_FW_VERSION_1)
1311                         retval = ((cfgte->unique_flags1 & 0x80) == 0);
1312                 else
1313                         retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1314                                   (cfgte->unique_flags1 & 0x80) == 0);
1315
1316         } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1317                 retval = (RES_BUS(cfgte->resource_address) !=
1318                                 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1319         return retval;
1320 }
1321
1322 /* attributes supported by pmcraid_event_family */
1323 enum {
1324         PMCRAID_AEN_ATTR_UNSPEC,
1325         PMCRAID_AEN_ATTR_EVENT,
1326         __PMCRAID_AEN_ATTR_MAX,
1327 };
1328 #define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1329
1330 /* commands supported by pmcraid_event_family */
1331 enum {
1332         PMCRAID_AEN_CMD_UNSPEC,
1333         PMCRAID_AEN_CMD_EVENT,
1334         __PMCRAID_AEN_CMD_MAX,
1335 };
1336 #define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1337
1338 static struct genl_multicast_group pmcraid_mcgrps[] = {
1339         { .name = "events", /* not really used - see ID discussion below */ },
1340 };
1341
1342 static struct genl_family pmcraid_event_family __ro_after_init = {
1343         .module = THIS_MODULE,
1344         .name = "pmcraid",
1345         .version = 1,
1346         .maxattr = PMCRAID_AEN_ATTR_MAX,
1347         .mcgrps = pmcraid_mcgrps,
1348         .n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
1349 };
1350
1351 /**
1352  * pmcraid_netlink_init - registers pmcraid_event_family
1353  *
1354  * Return value:
1355  *      0 if the pmcraid_event_family is successfully registered
1356  *      with netlink generic, non-zero otherwise
1357  */
1358 static int __init pmcraid_netlink_init(void)
1359 {
1360         int result;
1361
1362         result = genl_register_family(&pmcraid_event_family);
1363
1364         if (result)
1365                 return result;
1366
1367         pmcraid_info("registered NETLINK GENERIC group: %d\n",
1368                      pmcraid_event_family.id);
1369
1370         return result;
1371 }
1372
1373 /**
1374  * pmcraid_netlink_release - unregisters pmcraid_event_family
1375  *
1376  * Return value:
1377  *      none
1378  */
1379 static void pmcraid_netlink_release(void)
1380 {
1381         genl_unregister_family(&pmcraid_event_family);
1382 }
1383
1384 /*
1385  * pmcraid_notify_aen - sends event msg to user space application
1386  * @pinstance: pointer to adapter instance structure
1387  *
1388  * Return value:
1389  *      0 if success, error value in case of any failure.
1390  */
1391 static int pmcraid_notify_aen(
1392         struct pmcraid_instance *pinstance,
1393         struct pmcraid_aen_msg  *aen_msg,
1394         u32    data_size)
1395 {
1396         struct sk_buff *skb;
1397         void *msg_header;
1398         u32  total_size, nla_genl_hdr_total_size;
1399         int result;
1400
1401         aen_msg->hostno = (pinstance->host->unique_id << 16 |
1402                            MINOR(pinstance->cdev.dev));
1403         aen_msg->length = data_size;
1404
1405         data_size += sizeof(*aen_msg);
1406
1407         total_size = nla_total_size(data_size);
1408         /* Add GENL_HDR to total_size */
1409         nla_genl_hdr_total_size =
1410                 (total_size + (GENL_HDRLEN +
1411                 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1412                  + NLMSG_HDRLEN);
1413         skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1414
1415
1416         if (!skb) {
1417                 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1418                              total_size);
1419                 return -ENOMEM;
1420         }
1421
1422         /* add the genetlink message header */
1423         msg_header = genlmsg_put(skb, 0, 0,
1424                                  &pmcraid_event_family, 0,
1425                                  PMCRAID_AEN_CMD_EVENT);
1426         if (!msg_header) {
1427                 pmcraid_err("failed to copy command details\n");
1428                 nlmsg_free(skb);
1429                 return -ENOMEM;
1430         }
1431
1432         result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1433
1434         if (result) {
1435                 pmcraid_err("failed to copy AEN attribute data\n");
1436                 nlmsg_free(skb);
1437                 return -EINVAL;
1438         }
1439
1440         /* send genetlink multicast message to notify applications */
1441         genlmsg_end(skb, msg_header);
1442
1443         result = genlmsg_multicast(&pmcraid_event_family, skb,
1444                                    0, 0, GFP_ATOMIC);
1445
1446         /* If there are no listeners, genlmsg_multicast may return non-zero
1447          * value.
1448          */
1449         if (result)
1450                 pmcraid_info("error (%x) sending aen event message\n", result);
1451         return result;
1452 }
1453
1454 /**
1455  * pmcraid_notify_ccn - notifies about CCN event msg to user space
1456  * @pinstance: pointer adapter instance structure
1457  *
1458  * Return value:
1459  *      0 if success, error value in case of any failure
1460  */
1461 static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1462 {
1463         return pmcraid_notify_aen(pinstance,
1464                                 pinstance->ccn.msg,
1465                                 le32_to_cpu(pinstance->ccn.hcam->data_len) +
1466                                 sizeof(struct pmcraid_hcam_hdr));
1467 }
1468
1469 /**
1470  * pmcraid_notify_ldn - notifies about CCN event msg to user space
1471  * @pinstance: pointer adapter instance structure
1472  *
1473  * Return value:
1474  *      0 if success, error value in case of any failure
1475  */
1476 static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1477 {
1478         return pmcraid_notify_aen(pinstance,
1479                                 pinstance->ldn.msg,
1480                                 le32_to_cpu(pinstance->ldn.hcam->data_len) +
1481                                 sizeof(struct pmcraid_hcam_hdr));
1482 }
1483
1484 /**
1485  * pmcraid_notify_ioastate - sends IOA state event msg to user space
1486  * @pinstance: pointer adapter instance structure
1487  * @evt: controller state event to be sent
1488  *
1489  * Return value:
1490  *      0 if success, error value in case of any failure
1491  */
1492 static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1493 {
1494         pinstance->scn.ioa_state = evt;
1495         pmcraid_notify_aen(pinstance,
1496                           &pinstance->scn.msg,
1497                           sizeof(u32));
1498 }
1499
1500 /**
1501  * pmcraid_handle_config_change - Handle a config change from the adapter
1502  * @pinstance: pointer to per adapter instance structure
1503  *
1504  * Return value:
1505  *  none
1506  */
1507
1508 static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1509 {
1510         struct pmcraid_config_table_entry *cfg_entry;
1511         struct pmcraid_hcam_ccn *ccn_hcam;
1512         struct pmcraid_cmd *cmd;
1513         struct pmcraid_cmd *cfgcmd;
1514         struct pmcraid_resource_entry *res = NULL;
1515         unsigned long lock_flags;
1516         unsigned long host_lock_flags;
1517         u32 new_entry = 1;
1518         u32 hidden_entry = 0;
1519         u16 fw_version;
1520         int rc;
1521
1522         ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1523         cfg_entry = &ccn_hcam->cfg_entry;
1524         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1525
1526         pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1527                  res: %x:%x:%x:%x\n",
1528                  le32_to_cpu(pinstance->ccn.hcam->ilid),
1529                  pinstance->ccn.hcam->op_code,
1530                 (le32_to_cpu(pinstance->ccn.hcam->timestamp1) |
1531                 ((le32_to_cpu(pinstance->ccn.hcam->timestamp2) & 0xffffffffLL) << 32)),
1532                  pinstance->ccn.hcam->notification_type,
1533                  pinstance->ccn.hcam->notification_lost,
1534                  pinstance->ccn.hcam->flags,
1535                  pinstance->host->unique_id,
1536                  RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1537                  (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1538                         RES_BUS(cfg_entry->resource_address)),
1539                  RES_IS_VSET(*cfg_entry) ?
1540                         (fw_version <= PMCRAID_FW_VERSION_1 ?
1541                                 cfg_entry->unique_flags1 :
1542                                 le16_to_cpu(cfg_entry->array_id) & 0xFF) :
1543                         RES_TARGET(cfg_entry->resource_address),
1544                  RES_LUN(cfg_entry->resource_address));
1545
1546
1547         /* If this HCAM indicates a lost notification, read the config table */
1548         if (pinstance->ccn.hcam->notification_lost) {
1549                 cfgcmd = pmcraid_get_free_cmd(pinstance);
1550                 if (cfgcmd) {
1551                         pmcraid_info("lost CCN, reading config table\b");
1552                         pinstance->reinit_cfg_table = 1;
1553                         pmcraid_querycfg(cfgcmd);
1554                 } else {
1555                         pmcraid_err("lost CCN, no free cmd for querycfg\n");
1556                 }
1557                 goto out_notify_apps;
1558         }
1559
1560         /* If this resource is not going to be added to mid-layer, just notify
1561          * applications and return. If this notification is about hiding a VSET
1562          * resource, check if it was exposed already.
1563          */
1564         if (pinstance->ccn.hcam->notification_type ==
1565             NOTIFICATION_TYPE_ENTRY_CHANGED &&
1566             cfg_entry->resource_type == RES_TYPE_VSET) {
1567                 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1568         } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1569                 goto out_notify_apps;
1570         }
1571
1572         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1573         list_for_each_entry(res, &pinstance->used_res_q, queue) {
1574                 rc = memcmp(&res->cfg_entry.resource_address,
1575                             &cfg_entry->resource_address,
1576                             sizeof(cfg_entry->resource_address));
1577                 if (!rc) {
1578                         new_entry = 0;
1579                         break;
1580                 }
1581         }
1582
1583         if (new_entry) {
1584
1585                 if (hidden_entry) {
1586                         spin_unlock_irqrestore(&pinstance->resource_lock,
1587                                                 lock_flags);
1588                         goto out_notify_apps;
1589                 }
1590
1591                 /* If there are more number of resources than what driver can
1592                  * manage, do not notify the applications about the CCN. Just
1593                  * ignore this notifications and re-register the same HCAM
1594                  */
1595                 if (list_empty(&pinstance->free_res_q)) {
1596                         spin_unlock_irqrestore(&pinstance->resource_lock,
1597                                                 lock_flags);
1598                         pmcraid_err("too many resources attached\n");
1599                         spin_lock_irqsave(pinstance->host->host_lock,
1600                                           host_lock_flags);
1601                         pmcraid_send_hcam(pinstance,
1602                                           PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1603                         spin_unlock_irqrestore(pinstance->host->host_lock,
1604                                                host_lock_flags);
1605                         return;
1606                 }
1607
1608                 res = list_entry(pinstance->free_res_q.next,
1609                                  struct pmcraid_resource_entry, queue);
1610
1611                 list_del(&res->queue);
1612                 res->scsi_dev = NULL;
1613                 res->reset_progress = 0;
1614                 list_add_tail(&res->queue, &pinstance->used_res_q);
1615         }
1616
1617         memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1618
1619         if (pinstance->ccn.hcam->notification_type ==
1620             NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1621                 if (res->scsi_dev) {
1622                         if (fw_version <= PMCRAID_FW_VERSION_1)
1623                                 res->cfg_entry.unique_flags1 &= 0x7F;
1624                         else
1625                                 res->cfg_entry.array_id &= cpu_to_le16(0xFF);
1626                         res->change_detected = RES_CHANGE_DEL;
1627                         res->cfg_entry.resource_handle =
1628                                 PMCRAID_INVALID_RES_HANDLE;
1629                         schedule_work(&pinstance->worker_q);
1630                 } else {
1631                         /* This may be one of the non-exposed resources */
1632                         list_move_tail(&res->queue, &pinstance->free_res_q);
1633                 }
1634         } else if (!res->scsi_dev) {
1635                 res->change_detected = RES_CHANGE_ADD;
1636                 schedule_work(&pinstance->worker_q);
1637         }
1638         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1639
1640 out_notify_apps:
1641
1642         /* Notify configuration changes to registered applications.*/
1643         if (!pmcraid_disable_aen)
1644                 pmcraid_notify_ccn(pinstance);
1645
1646         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1647         if (cmd)
1648                 pmcraid_send_hcam_cmd(cmd);
1649 }
1650
1651 /**
1652  * pmcraid_get_error_info - return error string for an ioasc
1653  * @ioasc: ioasc code
1654  * Return Value
1655  *       none
1656  */
1657 static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1658 {
1659         int i;
1660         for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1661                 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1662                         return &pmcraid_ioasc_error_table[i];
1663         }
1664         return NULL;
1665 }
1666
1667 /**
1668  * pmcraid_ioasc_logger - log IOASC information based user-settings
1669  * @ioasc: ioasc code
1670  * @cmd: pointer to command that resulted in 'ioasc'
1671  */
1672 static void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1673 {
1674         struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1675
1676         if (error_info == NULL ||
1677                 cmd->drv_inst->current_log_level < error_info->log_level)
1678                 return;
1679
1680         /* log the error string */
1681         pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1682                 cmd->ioa_cb->ioarcb.cdb[0],
1683                 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
1684                 ioasc, error_info->error_string);
1685 }
1686
1687 /**
1688  * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1689  *
1690  * @pinstance: pointer to per adapter instance structure
1691  *
1692  * Return value:
1693  *  none
1694  */
1695 static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1696 {
1697         struct pmcraid_hcam_ldn *hcam_ldn;
1698         u32 ioasc;
1699
1700         hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1701
1702         pmcraid_info
1703                 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1704                  pinstance->ldn.hcam->ilid,
1705                  pinstance->ldn.hcam->op_code,
1706                  pinstance->ldn.hcam->notification_type,
1707                  pinstance->ldn.hcam->notification_lost,
1708                  pinstance->ldn.hcam->flags,
1709                  pinstance->ldn.hcam->overlay_id);
1710
1711         /* log only the errors, no need to log informational log entries */
1712         if (pinstance->ldn.hcam->notification_type !=
1713             NOTIFICATION_TYPE_ERROR_LOG)
1714                 return;
1715
1716         if (pinstance->ldn.hcam->notification_lost ==
1717             HOSTRCB_NOTIFICATIONS_LOST)
1718                 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1719
1720         ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1721
1722         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1723                 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1724                 dev_info(&pinstance->pdev->dev,
1725                         "UnitAttention due to IOA Bus Reset\n");
1726                 scsi_report_bus_reset(
1727                         pinstance->host,
1728                         RES_BUS(hcam_ldn->error_log.fd_ra));
1729         }
1730
1731         return;
1732 }
1733
1734 /**
1735  * pmcraid_process_ccn - Op done function for a CCN.
1736  * @cmd: pointer to command struct
1737  *
1738  * This function is the op done function for a configuration
1739  * change notification
1740  *
1741  * Return value:
1742  * none
1743  */
1744 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1745 {
1746         struct pmcraid_instance *pinstance = cmd->drv_inst;
1747         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1748         unsigned long lock_flags;
1749
1750         pinstance->ccn.cmd = NULL;
1751         pmcraid_return_cmd(cmd);
1752
1753         /* If driver initiated IOA reset happened while this hcam was pending
1754          * with IOA, or IOA bringdown sequence is in progress, no need to
1755          * re-register the hcam
1756          */
1757         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1758             atomic_read(&pinstance->ccn.ignore) == 1) {
1759                 return;
1760         } else if (ioasc) {
1761                 dev_info(&pinstance->pdev->dev,
1762                         "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1763                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1764                 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1765                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1766         } else {
1767                 pmcraid_handle_config_change(pinstance);
1768         }
1769 }
1770
1771 static void pmcraid_initiate_reset(struct pmcraid_instance *);
1772 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1773 /**
1774  * pmcraid_process_ldn - op done function for an LDN
1775  * @cmd: pointer to command block
1776  *
1777  * Return value
1778  *   none
1779  */
1780 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1781 {
1782         struct pmcraid_instance *pinstance = cmd->drv_inst;
1783         struct pmcraid_hcam_ldn *ldn_hcam =
1784                         (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1785         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1786         u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1787         unsigned long lock_flags;
1788
1789         /* return the command block back to freepool */
1790         pinstance->ldn.cmd = NULL;
1791         pmcraid_return_cmd(cmd);
1792
1793         /* If driver initiated IOA reset happened while this hcam was pending
1794          * with IOA, no need to re-register the hcam as reset engine will do it
1795          * once reset sequence is complete
1796          */
1797         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1798             atomic_read(&pinstance->ccn.ignore) == 1) {
1799                 return;
1800         } else if (!ioasc) {
1801                 pmcraid_handle_error_log(pinstance);
1802                 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1803                         spin_lock_irqsave(pinstance->host->host_lock,
1804                                           lock_flags);
1805                         pmcraid_initiate_reset(pinstance);
1806                         spin_unlock_irqrestore(pinstance->host->host_lock,
1807                                                lock_flags);
1808                         return;
1809                 }
1810                 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1811                         pinstance->timestamp_error = 1;
1812                         pmcraid_set_timestamp(cmd);
1813                 }
1814         } else {
1815                 dev_info(&pinstance->pdev->dev,
1816                         "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1817         }
1818         /* send netlink message for HCAM notification if enabled */
1819         if (!pmcraid_disable_aen)
1820                 pmcraid_notify_ldn(pinstance);
1821
1822         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1823         if (cmd)
1824                 pmcraid_send_hcam_cmd(cmd);
1825 }
1826
1827 /**
1828  * pmcraid_register_hcams - register HCAMs for CCN and LDN
1829  *
1830  * @pinstance: pointer per adapter instance structure
1831  *
1832  * Return Value
1833  *   none
1834  */
1835 static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1836 {
1837         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1838         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1839 }
1840
1841 /**
1842  * pmcraid_unregister_hcams - cancel HCAMs registered already
1843  * @cmd: pointer to command used as part of reset sequence
1844  */
1845 static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1846 {
1847         struct pmcraid_instance *pinstance = cmd->drv_inst;
1848
1849         /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1850          * handling hcam response though it is not necessary. In order to
1851          * prevent this, set 'ignore', so that bring-down sequence doesn't
1852          * re-send any more hcams
1853          */
1854         atomic_set(&pinstance->ccn.ignore, 1);
1855         atomic_set(&pinstance->ldn.ignore, 1);
1856
1857         /* If adapter reset was forced as part of runtime reset sequence,
1858          * start the reset sequence. Reset will be triggered even in case
1859          * IOA unit_check.
1860          */
1861         if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1862              pinstance->ioa_unit_check) {
1863                 pinstance->force_ioa_reset = 0;
1864                 pinstance->ioa_unit_check = 0;
1865                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1866                 pmcraid_reset_alert(cmd);
1867                 return;
1868         }
1869
1870         /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1871          * one after the other. So CCN cancellation will be triggered by
1872          * pmcraid_cancel_ldn itself.
1873          */
1874         pmcraid_cancel_ldn(cmd);
1875 }
1876
1877 static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1878
1879 /**
1880  * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1881  * @pinstance: pointer to adapter instance structure
1882  * Return Value
1883  *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1884  */
1885 static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1886 {
1887         u32 intrs;
1888
1889         pmcraid_reinit_buffers(pinstance);
1890         intrs = pmcraid_read_interrupts(pinstance);
1891
1892         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1893
1894         if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1895                 if (!pinstance->interrupt_mode) {
1896                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1897                                 pinstance->int_regs.
1898                                 ioa_host_interrupt_mask_reg);
1899                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1900                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1901                 }
1902                 return 1;
1903         } else {
1904                 return 0;
1905         }
1906 }
1907
1908 /**
1909  * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1910  * @cmd : pointer to reset command block
1911  *
1912  * Return Value
1913  *      none
1914  */
1915 static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1916 {
1917         struct pmcraid_instance *pinstance = cmd->drv_inst;
1918         u32 int_reg;
1919         u32 doorbell;
1920
1921         /* There will be an interrupt when Transition to Operational bit is
1922          * set so tasklet would execute next reset task. The timeout handler
1923          * would re-initiate a reset
1924          */
1925         cmd->cmd_done = pmcraid_ioa_reset;
1926         cmd->timer.expires = jiffies +
1927                              msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
1928         cmd->timer.function = pmcraid_timeout_handler;
1929
1930         if (!timer_pending(&cmd->timer))
1931                 add_timer(&cmd->timer);
1932
1933         /* Enable destructive diagnostics on IOA if it is not yet in
1934          * operational state
1935          */
1936         doorbell = DOORBELL_RUNTIME_RESET |
1937                    DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
1938
1939         /* Since we do RESET_ALERT and Start BIST we have to again write
1940          * MSIX Doorbell to indicate the interrupt mode
1941          */
1942         if (pinstance->interrupt_mode) {
1943                 iowrite32(DOORBELL_INTR_MODE_MSIX,
1944                           pinstance->int_regs.host_ioa_interrupt_reg);
1945                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
1946         }
1947
1948         iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
1949         ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1950         int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
1951
1952         pmcraid_info("Waiting for IOA to become operational %x:%x\n",
1953                      ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1954                      int_reg);
1955 }
1956
1957 /**
1958  * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
1959  *
1960  * @pinstance: pointer to adapter instance structure
1961  *
1962  * Return Value
1963  *      none
1964  */
1965 static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
1966 {
1967         pmcraid_info("%s is not yet implemented\n", __func__);
1968 }
1969
1970 /**
1971  * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
1972  * @pinstance: pointer to adapter instance structure
1973  *
1974  * This function fails all outstanding ops. If they are submitted to IOA
1975  * already, it sends cancel all messages if IOA is still accepting IOARCBs,
1976  * otherwise just completes the commands and returns the cmd blocks to free
1977  * pool.
1978  *
1979  * Return value:
1980  *       none
1981  */
1982 static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
1983 {
1984         struct pmcraid_cmd *cmd, *temp;
1985         unsigned long lock_flags;
1986
1987         /* pending command list is protected by pending_pool_lock. Its
1988          * traversal must be done as within this lock
1989          */
1990         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
1991         list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
1992                                  free_list) {
1993                 list_del(&cmd->free_list);
1994                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
1995                                         lock_flags);
1996                 cmd->ioa_cb->ioasa.ioasc =
1997                         cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
1998                 cmd->ioa_cb->ioasa.ilid =
1999                         cpu_to_le32(PMCRAID_DRIVER_ILID);
2000
2001                 /* In case the command timer is still running */
2002                 del_timer(&cmd->timer);
2003
2004                 /* If this is an IO command, complete it by invoking scsi_done
2005                  * function. If this is one of the internal commands other
2006                  * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2007                  * complete it
2008                  */
2009                 if (cmd->scsi_cmd) {
2010
2011                         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2012                         __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2013
2014                         scsi_cmd->result |= DID_ERROR << 16;
2015
2016                         scsi_dma_unmap(scsi_cmd);
2017                         pmcraid_return_cmd(cmd);
2018
2019                         pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2020                                      le32_to_cpu(resp) >> 2,
2021                                      cmd->ioa_cb->ioarcb.cdb[0],
2022                                      scsi_cmd->result);
2023                         scsi_done(scsi_cmd);
2024                 } else if (cmd->cmd_done == pmcraid_internal_done ||
2025                            cmd->cmd_done == pmcraid_erp_done) {
2026                         cmd->cmd_done(cmd);
2027                 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2028                            cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2029                         pmcraid_return_cmd(cmd);
2030                 }
2031
2032                 atomic_dec(&pinstance->outstanding_cmds);
2033                 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2034         }
2035
2036         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2037 }
2038
2039 /**
2040  * pmcraid_ioa_reset - Implementation of IOA reset logic
2041  *
2042  * @cmd: pointer to the cmd block to be used for entire reset process
2043  *
2044  * This function executes most of the steps required for IOA reset. This gets
2045  * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2046  * 'eh_' thread. Access to variables used for controlling the reset sequence is
2047  * synchronized using host lock. Various functions called during reset process
2048  * would make use of a single command block, pointer to which is also stored in
2049  * adapter instance structure.
2050  *
2051  * Return Value
2052  *       None
2053  */
2054 static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2055 {
2056         struct pmcraid_instance *pinstance = cmd->drv_inst;
2057         u8 reset_complete = 0;
2058
2059         pinstance->ioa_reset_in_progress = 1;
2060
2061         if (pinstance->reset_cmd != cmd) {
2062                 pmcraid_err("reset is called with different command block\n");
2063                 pinstance->reset_cmd = cmd;
2064         }
2065
2066         pmcraid_info("reset_engine: state = %d, command = %p\n",
2067                       pinstance->ioa_state, cmd);
2068
2069         switch (pinstance->ioa_state) {
2070
2071         case IOA_STATE_DEAD:
2072                 /* If IOA is offline, whatever may be the reset reason, just
2073                  * return. callers might be waiting on the reset wait_q, wake
2074                  * up them
2075                  */
2076                 pmcraid_err("IOA is offline no reset is possible\n");
2077                 reset_complete = 1;
2078                 break;
2079
2080         case IOA_STATE_IN_BRINGDOWN:
2081                 /* we enter here, once ioa shutdown command is processed by IOA
2082                  * Alert IOA for a possible reset. If reset alert fails, IOA
2083                  * goes through hard-reset
2084                  */
2085                 pmcraid_disable_interrupts(pinstance, ~0);
2086                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2087                 pmcraid_reset_alert(cmd);
2088                 break;
2089
2090         case IOA_STATE_UNKNOWN:
2091                 /* We may be called during probe or resume. Some pre-processing
2092                  * is required for prior to reset
2093                  */
2094                 scsi_block_requests(pinstance->host);
2095
2096                 /* If asked to reset while IOA was processing responses or
2097                  * there are any error responses then IOA may require
2098                  * hard-reset.
2099                  */
2100                 if (pinstance->ioa_hard_reset == 0) {
2101                         if (ioread32(pinstance->ioa_status) &
2102                             INTRS_TRANSITION_TO_OPERATIONAL) {
2103                                 pmcraid_info("sticky bit set, bring-up\n");
2104                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2105                                 pmcraid_reinit_cmdblk(cmd);
2106                                 pmcraid_identify_hrrq(cmd);
2107                         } else {
2108                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2109                                 pmcraid_soft_reset(cmd);
2110                         }
2111                 } else {
2112                         /* Alert IOA of a possible reset and wait for critical
2113                          * operation in progress bit to reset
2114                          */
2115                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2116                         pmcraid_reset_alert(cmd);
2117                 }
2118                 break;
2119
2120         case IOA_STATE_IN_RESET_ALERT:
2121                 /* If critical operation in progress bit is reset or wait gets
2122                  * timed out, reset proceeds with starting BIST on the IOA.
2123                  * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2124                  * they are 3 or more, reset engine marks IOA dead and returns
2125                  */
2126                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2127                 pmcraid_start_bist(cmd);
2128                 break;
2129
2130         case IOA_STATE_IN_HARD_RESET:
2131                 pinstance->ioa_reset_attempts++;
2132
2133                 /* retry reset if we haven't reached maximum allowed limit */
2134                 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2135                         pinstance->ioa_reset_attempts = 0;
2136                         pmcraid_err("IOA didn't respond marking it as dead\n");
2137                         pinstance->ioa_state = IOA_STATE_DEAD;
2138
2139                         if (pinstance->ioa_bringdown)
2140                                 pmcraid_notify_ioastate(pinstance,
2141                                         PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2142                         else
2143                                 pmcraid_notify_ioastate(pinstance,
2144                                                 PMC_DEVICE_EVENT_RESET_FAILED);
2145                         reset_complete = 1;
2146                         break;
2147                 }
2148
2149                 /* Once either bist or pci reset is done, restore PCI config
2150                  * space. If this fails, proceed with hard reset again
2151                  */
2152                 pci_restore_state(pinstance->pdev);
2153
2154                 /* fail all pending commands */
2155                 pmcraid_fail_outstanding_cmds(pinstance);
2156
2157                 /* check if unit check is active, if so extract dump */
2158                 if (pinstance->ioa_unit_check) {
2159                         pmcraid_info("unit check is active\n");
2160                         pinstance->ioa_unit_check = 0;
2161                         pmcraid_get_dump(pinstance);
2162                         pinstance->ioa_reset_attempts--;
2163                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2164                         pmcraid_reset_alert(cmd);
2165                         break;
2166                 }
2167
2168                 /* if the reset reason is to bring-down the ioa, we might be
2169                  * done with the reset restore pci_config_space and complete
2170                  * the reset
2171                  */
2172                 if (pinstance->ioa_bringdown) {
2173                         pmcraid_info("bringing down the adapter\n");
2174                         pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2175                         pinstance->ioa_bringdown = 0;
2176                         pinstance->ioa_state = IOA_STATE_UNKNOWN;
2177                         pmcraid_notify_ioastate(pinstance,
2178                                         PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2179                         reset_complete = 1;
2180                 } else {
2181                         /* bring-up IOA, so proceed with soft reset
2182                          * Reinitialize hrrq_buffers and their indices also
2183                          * enable interrupts after a pci_restore_state
2184                          */
2185                         if (pmcraid_reset_enable_ioa(pinstance)) {
2186                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2187                                 pmcraid_info("bringing up the adapter\n");
2188                                 pmcraid_reinit_cmdblk(cmd);
2189                                 pmcraid_identify_hrrq(cmd);
2190                         } else {
2191                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2192                                 pmcraid_soft_reset(cmd);
2193                         }
2194                 }
2195                 break;
2196
2197         case IOA_STATE_IN_SOFT_RESET:
2198                 /* TRANSITION TO OPERATIONAL is on so start initialization
2199                  * sequence
2200                  */
2201                 pmcraid_info("In softreset proceeding with bring-up\n");
2202                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2203
2204                 /* Initialization commands start with HRRQ identification. From
2205                  * now on tasklet completes most of the commands as IOA is up
2206                  * and intrs are enabled
2207                  */
2208                 pmcraid_identify_hrrq(cmd);
2209                 break;
2210
2211         case IOA_STATE_IN_BRINGUP:
2212                 /* we are done with bringing up of IOA, change the ioa_state to
2213                  * operational and wake up any waiters
2214                  */
2215                 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2216                 reset_complete = 1;
2217                 break;
2218
2219         case IOA_STATE_OPERATIONAL:
2220         default:
2221                 /* When IOA is operational and a reset is requested, check for
2222                  * the reset reason. If reset is to bring down IOA, unregister
2223                  * HCAMs and initiate shutdown; if adapter reset is forced then
2224                  * restart reset sequence again
2225                  */
2226                 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2227                     pinstance->force_ioa_reset == 0) {
2228                         pmcraid_notify_ioastate(pinstance,
2229                                                 PMC_DEVICE_EVENT_RESET_SUCCESS);
2230                         reset_complete = 1;
2231                 } else {
2232                         if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2233                                 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2234                         pmcraid_reinit_cmdblk(cmd);
2235                         pmcraid_unregister_hcams(cmd);
2236                 }
2237                 break;
2238         }
2239
2240         /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2241          * OPERATIONAL. Reset all control variables used during reset, wake up
2242          * any waiting threads and let the SCSI mid-layer send commands. Note
2243          * that host_lock must be held before invoking scsi_report_bus_reset.
2244          */
2245         if (reset_complete) {
2246                 pinstance->ioa_reset_in_progress = 0;
2247                 pinstance->ioa_reset_attempts = 0;
2248                 pinstance->reset_cmd = NULL;
2249                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2250                 pinstance->ioa_bringdown = 0;
2251                 pmcraid_return_cmd(cmd);
2252
2253                 /* If target state is to bring up the adapter, proceed with
2254                  * hcam registration and resource exposure to mid-layer.
2255                  */
2256                 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2257                         pmcraid_register_hcams(pinstance);
2258
2259                 wake_up_all(&pinstance->reset_wait_q);
2260         }
2261
2262         return;
2263 }
2264
2265 /**
2266  * pmcraid_initiate_reset - initiates reset sequence. This is called from
2267  * ISR/tasklet during error interrupts including IOA unit check. If reset
2268  * is already in progress, it just returns, otherwise initiates IOA reset
2269  * to bring IOA up to operational state.
2270  *
2271  * @pinstance: pointer to adapter instance structure
2272  *
2273  * Return value
2274  *       none
2275  */
2276 static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2277 {
2278         struct pmcraid_cmd *cmd;
2279
2280         /* If the reset is already in progress, just return, otherwise start
2281          * reset sequence and return
2282          */
2283         if (!pinstance->ioa_reset_in_progress) {
2284                 scsi_block_requests(pinstance->host);
2285                 cmd = pmcraid_get_free_cmd(pinstance);
2286
2287                 if (cmd == NULL) {
2288                         pmcraid_err("no cmnd blocks for initiate_reset\n");
2289                         return;
2290                 }
2291
2292                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2293                 pinstance->reset_cmd = cmd;
2294                 pinstance->force_ioa_reset = 1;
2295                 pmcraid_notify_ioastate(pinstance,
2296                                         PMC_DEVICE_EVENT_RESET_START);
2297                 pmcraid_ioa_reset(cmd);
2298         }
2299 }
2300
2301 /**
2302  * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2303  *                        or bringdown IOA
2304  * @pinstance: pointer adapter instance structure
2305  * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2306  * @target_state: expected target state after reset
2307  *
2308  * Note: This command initiates reset and waits for its completion. Hence this
2309  * should not be called from isr/timer/tasklet functions (timeout handlers,
2310  * error response handlers and interrupt handlers).
2311  *
2312  * Return Value
2313  *       1 in case ioa_state is not target_state, 0 otherwise.
2314  */
2315 static int pmcraid_reset_reload(
2316         struct pmcraid_instance *pinstance,
2317         u8 shutdown_type,
2318         u8 target_state
2319 )
2320 {
2321         struct pmcraid_cmd *reset_cmd = NULL;
2322         unsigned long lock_flags;
2323         int reset = 1;
2324
2325         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2326
2327         if (pinstance->ioa_reset_in_progress) {
2328                 pmcraid_info("reset_reload: reset is already in progress\n");
2329
2330                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2331
2332                 wait_event(pinstance->reset_wait_q,
2333                            !pinstance->ioa_reset_in_progress);
2334
2335                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2336
2337                 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2338                         pmcraid_info("reset_reload: IOA is dead\n");
2339                         goto out_unlock;
2340                 }
2341
2342                 if (pinstance->ioa_state == target_state) {
2343                         reset = 0;
2344                         goto out_unlock;
2345                 }
2346         }
2347
2348         pmcraid_info("reset_reload: proceeding with reset\n");
2349         scsi_block_requests(pinstance->host);
2350         reset_cmd = pmcraid_get_free_cmd(pinstance);
2351         if (reset_cmd == NULL) {
2352                 pmcraid_err("no free cmnd for reset_reload\n");
2353                 goto out_unlock;
2354         }
2355
2356         if (shutdown_type == SHUTDOWN_NORMAL)
2357                 pinstance->ioa_bringdown = 1;
2358
2359         pinstance->ioa_shutdown_type = shutdown_type;
2360         pinstance->reset_cmd = reset_cmd;
2361         pinstance->force_ioa_reset = reset;
2362         pmcraid_info("reset_reload: initiating reset\n");
2363         pmcraid_ioa_reset(reset_cmd);
2364         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2365         pmcraid_info("reset_reload: waiting for reset to complete\n");
2366         wait_event(pinstance->reset_wait_q,
2367                    !pinstance->ioa_reset_in_progress);
2368
2369         pmcraid_info("reset_reload: reset is complete !!\n");
2370         scsi_unblock_requests(pinstance->host);
2371         return pinstance->ioa_state != target_state;
2372
2373 out_unlock:
2374         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2375         return reset;
2376 }
2377
2378 /**
2379  * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2380  *
2381  * @pinstance: pointer to adapter instance structure
2382  *
2383  * Return Value
2384  *       whatever is returned from pmcraid_reset_reload
2385  */
2386 static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2387 {
2388         return pmcraid_reset_reload(pinstance,
2389                                     SHUTDOWN_NORMAL,
2390                                     IOA_STATE_UNKNOWN);
2391 }
2392
2393 /**
2394  * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2395  *
2396  * @pinstance: pointer to adapter instance structure
2397  *
2398  * Return Value
2399  *       whatever is returned from pmcraid_reset_reload
2400  */
2401 static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2402 {
2403         pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2404
2405         return pmcraid_reset_reload(pinstance,
2406                                     SHUTDOWN_NONE,
2407                                     IOA_STATE_OPERATIONAL);
2408 }
2409
2410 /**
2411  * pmcraid_request_sense - Send request sense to a device
2412  * @cmd: pmcraid command struct
2413  *
2414  * This function sends a request sense to a device as a result of a check
2415  * condition. This method re-uses the same command block that failed earlier.
2416  */
2417 static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2418 {
2419         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2420         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2421         struct device *dev = &cmd->drv_inst->pdev->dev;
2422
2423         cmd->sense_buffer = cmd->scsi_cmd->sense_buffer;
2424         cmd->sense_buffer_dma = dma_map_single(dev, cmd->sense_buffer,
2425                         SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
2426         if (dma_mapping_error(dev, cmd->sense_buffer_dma)) {
2427                 pmcraid_err
2428                         ("couldn't allocate sense buffer for request sense\n");
2429                 pmcraid_erp_done(cmd);
2430                 return;
2431         }
2432
2433         /* re-use the command block */
2434         memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2435         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2436         ioarcb->request_flags0 = (SYNC_COMPLETE |
2437                                   NO_LINK_DESCS |
2438                                   INHIBIT_UL_CHECK);
2439         ioarcb->request_type = REQ_TYPE_SCSI;
2440         ioarcb->cdb[0] = REQUEST_SENSE;
2441         ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2442
2443         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2444                                         offsetof(struct pmcraid_ioarcb,
2445                                                 add_data.u.ioadl[0]));
2446         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2447
2448         ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2449
2450         ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2451         ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2452         ioadl->flags = IOADL_FLAGS_LAST_DESC;
2453
2454         /* request sense might be called as part of error response processing
2455          * which runs in tasklets context. It is possible that mid-layer might
2456          * schedule queuecommand during this time, hence, writting to IOARRIN
2457          * must be protect by host_lock
2458          */
2459         pmcraid_send_cmd(cmd, pmcraid_erp_done,
2460                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2461                          pmcraid_timeout_handler);
2462 }
2463
2464 /**
2465  * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2466  * @cmd: command that failed
2467  * @need_sense: true if request_sense is required after cancel all
2468  *
2469  * This function sends a cancel all to a device to clear the queue.
2470  */
2471 static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, bool need_sense)
2472 {
2473         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2474         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2475         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2476
2477         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2478         ioarcb->request_flags0 = SYNC_OVERRIDE;
2479         ioarcb->request_type = REQ_TYPE_IOACMD;
2480         ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2481
2482         if (RES_IS_GSCSI(res->cfg_entry))
2483                 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2484
2485         ioarcb->ioadl_bus_addr = 0;
2486         ioarcb->ioadl_length = 0;
2487         ioarcb->data_transfer_length = 0;
2488         ioarcb->ioarcb_bus_addr &= cpu_to_le64((~0x1FULL));
2489
2490         /* writing to IOARRIN must be protected by host_lock, as mid-layer
2491          * schedule queuecommand while we are doing this
2492          */
2493         pmcraid_send_cmd(cmd, need_sense ?
2494                          pmcraid_erp_done : pmcraid_request_sense,
2495                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2496                          pmcraid_timeout_handler);
2497 }
2498
2499 /**
2500  * pmcraid_frame_auto_sense: frame fixed format sense information
2501  *
2502  * @cmd: pointer to failing command block
2503  *
2504  * Return value
2505  *  none
2506  */
2507 static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2508 {
2509         u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2510         struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2511         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2512         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2513         u32 failing_lba = 0;
2514
2515         memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2516         cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2517
2518         if (RES_IS_VSET(res->cfg_entry) &&
2519             ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2520             ioasa->u.vset.failing_lba_hi != 0) {
2521
2522                 sense_buf[0] = 0x72;
2523                 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2524                 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2525                 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2526
2527                 sense_buf[7] = 12;
2528                 sense_buf[8] = 0;
2529                 sense_buf[9] = 0x0A;
2530                 sense_buf[10] = 0x80;
2531
2532                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2533
2534                 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2535                 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2536                 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2537                 sense_buf[15] = failing_lba & 0x000000ff;
2538
2539                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2540
2541                 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2542                 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2543                 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2544                 sense_buf[19] = failing_lba & 0x000000ff;
2545         } else {
2546                 sense_buf[0] = 0x70;
2547                 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2548                 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2549                 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2550
2551                 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2552                         if (RES_IS_VSET(res->cfg_entry))
2553                                 failing_lba =
2554                                         le32_to_cpu(ioasa->u.
2555                                                  vset.failing_lba_lo);
2556                         sense_buf[0] |= 0x80;
2557                         sense_buf[3] = (failing_lba >> 24) & 0xff;
2558                         sense_buf[4] = (failing_lba >> 16) & 0xff;
2559                         sense_buf[5] = (failing_lba >> 8) & 0xff;
2560                         sense_buf[6] = failing_lba & 0xff;
2561                 }
2562
2563                 sense_buf[7] = 6; /* additional length */
2564         }
2565 }
2566
2567 /**
2568  * pmcraid_error_handler - Error response handlers for a SCSI op
2569  * @cmd: pointer to pmcraid_cmd that has failed
2570  *
2571  * This function determines whether or not to initiate ERP on the affected
2572  * device. This is called from a tasklet, which doesn't hold any locks.
2573  *
2574  * Return value:
2575  *       0 it caller can complete the request, otherwise 1 where in error
2576  *       handler itself completes the request and returns the command block
2577  *       back to free-pool
2578  */
2579 static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2580 {
2581         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2582         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2583         struct pmcraid_instance *pinstance = cmd->drv_inst;
2584         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2585         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2586         u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2587         bool sense_copied = false;
2588
2589         if (!res) {
2590                 pmcraid_info("resource pointer is NULL\n");
2591                 return 0;
2592         }
2593
2594         /* If this was a SCSI read/write command keep count of errors */
2595         if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2596                 atomic_inc(&res->read_failures);
2597         else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2598                 atomic_inc(&res->write_failures);
2599
2600         if (!RES_IS_GSCSI(res->cfg_entry) &&
2601                 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2602                 pmcraid_frame_auto_sense(cmd);
2603         }
2604
2605         /* Log IOASC/IOASA information based on user settings */
2606         pmcraid_ioasc_logger(ioasc, cmd);
2607
2608         switch (masked_ioasc) {
2609
2610         case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2611                 scsi_cmd->result |= (DID_ABORT << 16);
2612                 break;
2613
2614         case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2615         case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2616                 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2617                 break;
2618
2619         case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2620                 res->sync_reqd = 1;
2621                 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2622                 break;
2623
2624         case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2625                 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2626                 break;
2627
2628         case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2629         case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2630                 if (!res->reset_progress)
2631                         scsi_report_bus_reset(pinstance->host,
2632                                               scsi_cmd->device->channel);
2633                 scsi_cmd->result |= (DID_ERROR << 16);
2634                 break;
2635
2636         case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2637                 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2638                 res->sync_reqd = 1;
2639
2640                 /* if check_condition is not active return with error otherwise
2641                  * get/frame the sense buffer
2642                  */
2643                 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2644                     SAM_STAT_CHECK_CONDITION &&
2645                     PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2646                         return 0;
2647
2648                 /* If we have auto sense data as part of IOASA pass it to
2649                  * mid-layer
2650                  */
2651                 if (ioasa->auto_sense_length != 0) {
2652                         short sense_len = le16_to_cpu(ioasa->auto_sense_length);
2653                         int data_size = min_t(u16, sense_len,
2654                                               SCSI_SENSE_BUFFERSIZE);
2655
2656                         memcpy(scsi_cmd->sense_buffer,
2657                                ioasa->sense_data,
2658                                data_size);
2659                         sense_copied = true;
2660                 }
2661
2662                 if (RES_IS_GSCSI(res->cfg_entry))
2663                         pmcraid_cancel_all(cmd, sense_copied);
2664                 else if (sense_copied)
2665                         pmcraid_erp_done(cmd);
2666                 else
2667                         pmcraid_request_sense(cmd);
2668
2669                 return 1;
2670
2671         case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2672                 break;
2673
2674         default:
2675                 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2676                         scsi_cmd->result |= (DID_ERROR << 16);
2677                 break;
2678         }
2679         return 0;
2680 }
2681
2682 /**
2683  * pmcraid_reset_device - device reset handler functions
2684  *
2685  * @scsi_dev: scsi device struct
2686  * @timeout: command timeout
2687  * @modifier: reset modifier indicating the reset sequence to be performed
2688  *
2689  * This function issues a device reset to the affected device.
2690  * A LUN reset will be sent to the device first. If that does
2691  * not work, a target reset will be sent.
2692  *
2693  * Return value:
2694  *      SUCCESS / FAILED
2695  */
2696 static int pmcraid_reset_device(
2697         struct scsi_device *scsi_dev,
2698         unsigned long timeout,
2699         u8 modifier)
2700 {
2701         struct pmcraid_cmd *cmd;
2702         struct pmcraid_instance *pinstance;
2703         struct pmcraid_resource_entry *res;
2704         struct pmcraid_ioarcb *ioarcb;
2705         unsigned long lock_flags;
2706         u32 ioasc;
2707
2708         pinstance =
2709                 (struct pmcraid_instance *)scsi_dev->host->hostdata;
2710         res = scsi_dev->hostdata;
2711
2712         if (!res) {
2713                 sdev_printk(KERN_ERR, scsi_dev,
2714                             "reset_device: NULL resource pointer\n");
2715                 return FAILED;
2716         }
2717
2718         /* If adapter is currently going through reset/reload, return failed.
2719          * This will force the mid-layer to call _eh_bus/host reset, which
2720          * will then go to sleep and wait for the reset to complete
2721          */
2722         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2723         if (pinstance->ioa_reset_in_progress ||
2724             pinstance->ioa_state == IOA_STATE_DEAD) {
2725                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2726                 return FAILED;
2727         }
2728
2729         res->reset_progress = 1;
2730         pmcraid_info("Resetting %s resource with addr %x\n",
2731                      ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2732                      ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2733                      le32_to_cpu(res->cfg_entry.resource_address));
2734
2735         /* get a free cmd block */
2736         cmd = pmcraid_get_free_cmd(pinstance);
2737
2738         if (cmd == NULL) {
2739                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2740                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2741                 return FAILED;
2742         }
2743
2744         ioarcb = &cmd->ioa_cb->ioarcb;
2745         ioarcb->resource_handle = res->cfg_entry.resource_handle;
2746         ioarcb->request_type = REQ_TYPE_IOACMD;
2747         ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2748
2749         /* Initialize reset modifier bits */
2750         if (modifier)
2751                 modifier = ENABLE_RESET_MODIFIER | modifier;
2752
2753         ioarcb->cdb[1] = modifier;
2754
2755         init_completion(&cmd->wait_for_completion);
2756         cmd->completion_req = 1;
2757
2758         pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2759                      cmd->ioa_cb->ioarcb.cdb[0],
2760                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2761                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2762
2763         pmcraid_send_cmd(cmd,
2764                          pmcraid_internal_done,
2765                          timeout,
2766                          pmcraid_timeout_handler);
2767
2768         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2769
2770         /* RESET_DEVICE command completes after all pending IOARCBs are
2771          * completed. Once this command is completed, pmcraind_internal_done
2772          * will wake up the 'completion' queue.
2773          */
2774         wait_for_completion(&cmd->wait_for_completion);
2775
2776         /* complete the command here itself and return the command block
2777          * to free list
2778          */
2779         pmcraid_return_cmd(cmd);
2780         res->reset_progress = 0;
2781         ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2782
2783         /* set the return value based on the returned ioasc */
2784         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2785 }
2786
2787 /**
2788  * _pmcraid_io_done - helper for pmcraid_io_done function
2789  *
2790  * @cmd: pointer to pmcraid command struct
2791  * @reslen: residual data length to be set in the ioasa
2792  * @ioasc: ioasc either returned by IOA or set by driver itself.
2793  *
2794  * This function is invoked by pmcraid_io_done to complete mid-layer
2795  * scsi ops.
2796  *
2797  * Return value:
2798  *        0 if caller is required to return it to free_pool. Returns 1 if
2799  *        caller need not worry about freeing command block as error handler
2800  *        will take care of that.
2801  */
2802
2803 static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2804 {
2805         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2806         int rc = 0;
2807
2808         scsi_set_resid(scsi_cmd, reslen);
2809
2810         pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2811                 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2812                 cmd->ioa_cb->ioarcb.cdb[0],
2813                 ioasc, scsi_cmd->result);
2814
2815         if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2816                 rc = pmcraid_error_handler(cmd);
2817
2818         if (rc == 0) {
2819                 scsi_dma_unmap(scsi_cmd);
2820                 scsi_done(scsi_cmd);
2821         }
2822
2823         return rc;
2824 }
2825
2826 /**
2827  * pmcraid_io_done - SCSI completion function
2828  *
2829  * @cmd: pointer to pmcraid command struct
2830  *
2831  * This function is invoked by tasklet/mid-layer error handler to completing
2832  * the SCSI ops sent from mid-layer.
2833  *
2834  * Return value
2835  *        none
2836  */
2837
2838 static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2839 {
2840         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2841         u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2842
2843         if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2844                 pmcraid_return_cmd(cmd);
2845 }
2846
2847 /**
2848  * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2849  *
2850  * @cmd: command block of the command to be aborted
2851  *
2852  * Return Value:
2853  *       returns pointer to command structure used as cancelling cmd
2854  */
2855 static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2856 {
2857         struct pmcraid_cmd *cancel_cmd;
2858         struct pmcraid_instance *pinstance;
2859
2860         pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2861
2862         cancel_cmd = pmcraid_get_free_cmd(pinstance);
2863
2864         if (cancel_cmd == NULL) {
2865                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2866                 return NULL;
2867         }
2868
2869         pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2870
2871         pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2872                 cmd->ioa_cb->ioarcb.cdb[0],
2873                 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2874
2875         init_completion(&cancel_cmd->wait_for_completion);
2876         cancel_cmd->completion_req = 1;
2877
2878         pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2879                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2880                 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2881                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2882
2883         pmcraid_send_cmd(cancel_cmd,
2884                          pmcraid_internal_done,
2885                          PMCRAID_INTERNAL_TIMEOUT,
2886                          pmcraid_timeout_handler);
2887         return cancel_cmd;
2888 }
2889
2890 /**
2891  * pmcraid_abort_complete - Waits for ABORT TASK completion
2892  *
2893  * @cancel_cmd: command block use as cancelling command
2894  *
2895  * Return Value:
2896  *       returns SUCCESS if ABORT TASK has good completion
2897  *       otherwise FAILED
2898  */
2899 static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2900 {
2901         struct pmcraid_resource_entry *res;
2902         u32 ioasc;
2903
2904         wait_for_completion(&cancel_cmd->wait_for_completion);
2905         res = cancel_cmd->res;
2906         cancel_cmd->res = NULL;
2907         ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2908
2909         /* If the abort task is not timed out we will get a Good completion
2910          * as sense_key, otherwise we may get one the following responses
2911          * due to subsequent bus reset or device reset. In case IOASC is
2912          * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2913          */
2914         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
2915             ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
2916                 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
2917                         res->sync_reqd = 1;
2918                 ioasc = 0;
2919         }
2920
2921         /* complete the command here itself */
2922         pmcraid_return_cmd(cancel_cmd);
2923         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2924 }
2925
2926 /**
2927  * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
2928  *
2929  * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
2930  *              mid-layer ensures that no other commands are queued. This
2931  *              never gets called under interrupt, but a separate eh thread.
2932  *
2933  * Return value:
2934  *       SUCCESS / FAILED
2935  */
2936 static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
2937 {
2938         struct pmcraid_instance *pinstance;
2939         struct pmcraid_cmd *cmd;
2940         struct pmcraid_resource_entry *res;
2941         unsigned long host_lock_flags;
2942         unsigned long pending_lock_flags;
2943         struct pmcraid_cmd *cancel_cmd = NULL;
2944         int cmd_found = 0;
2945         int rc = FAILED;
2946
2947         pinstance =
2948                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2949
2950         scmd_printk(KERN_INFO, scsi_cmd,
2951                     "I/O command timed out, aborting it.\n");
2952
2953         res = scsi_cmd->device->hostdata;
2954
2955         if (res == NULL)
2956                 return rc;
2957
2958         /* If we are currently going through reset/reload, return failed.
2959          * This will force the mid-layer to eventually call
2960          * pmcraid_eh_host_reset which will then go to sleep and wait for the
2961          * reset to complete
2962          */
2963         spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
2964
2965         if (pinstance->ioa_reset_in_progress ||
2966             pinstance->ioa_state == IOA_STATE_DEAD) {
2967                 spin_unlock_irqrestore(pinstance->host->host_lock,
2968                                        host_lock_flags);
2969                 return rc;
2970         }
2971
2972         /* loop over pending cmd list to find cmd corresponding to this
2973          * scsi_cmd. Note that this command might not have been completed
2974          * already. locking: all pending commands are protected with
2975          * pending_pool_lock.
2976          */
2977         spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
2978         list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
2979
2980                 if (cmd->scsi_cmd == scsi_cmd) {
2981                         cmd_found = 1;
2982                         break;
2983                 }
2984         }
2985
2986         spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2987                                 pending_lock_flags);
2988
2989         /* If the command to be aborted was given to IOA and still pending with
2990          * it, send ABORT_TASK to abort this and wait for its completion
2991          */
2992         if (cmd_found)
2993                 cancel_cmd = pmcraid_abort_cmd(cmd);
2994
2995         spin_unlock_irqrestore(pinstance->host->host_lock,
2996                                host_lock_flags);
2997
2998         if (cancel_cmd) {
2999                 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3000                 rc = pmcraid_abort_complete(cancel_cmd);
3001         }
3002
3003         return cmd_found ? rc : SUCCESS;
3004 }
3005
3006 /**
3007  * pmcraid_eh_device_reset_handler - bus/target/device reset handler callbacks
3008  *
3009  * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3010  *
3011  * All these routines invokve pmcraid_reset_device with appropriate parameters.
3012  * Since these are called from mid-layer EH thread, no other IO will be queued
3013  * to the resource being reset. However, control path (IOCTL) may be active so
3014  * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3015  * takes care by locking/unlocking host_lock.
3016  *
3017  * Return value
3018  *      SUCCESS or FAILED
3019  */
3020 static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3021 {
3022         scmd_printk(KERN_INFO, scmd,
3023                     "resetting device due to an I/O command timeout.\n");
3024         return pmcraid_reset_device(scmd->device,
3025                                     PMCRAID_INTERNAL_TIMEOUT,
3026                                     RESET_DEVICE_LUN);
3027 }
3028
3029 static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3030 {
3031         struct Scsi_Host *host = scmd->device->host;
3032         struct pmcraid_instance *pinstance =
3033                 (struct pmcraid_instance *)host->hostdata;
3034         struct pmcraid_resource_entry *res = NULL;
3035         struct pmcraid_resource_entry *temp;
3036         struct scsi_device *sdev = NULL;
3037         unsigned long lock_flags;
3038
3039         /*
3040          * The reset device code insists on us passing down
3041          * a device, so grab the first device on the bus.
3042          */
3043         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
3044         list_for_each_entry(temp, &pinstance->used_res_q, queue) {
3045                 if (scmd->device->channel == PMCRAID_VSET_BUS_ID &&
3046                     RES_IS_VSET(temp->cfg_entry)) {
3047                         res = temp;
3048                         break;
3049                 } else if (scmd->device->channel == PMCRAID_PHYS_BUS_ID &&
3050                            RES_IS_GSCSI(temp->cfg_entry)) {
3051                         res = temp;
3052                         break;
3053                 }
3054         }
3055         if (res)
3056                 sdev = res->scsi_dev;
3057         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
3058         if (!sdev)
3059                 return FAILED;
3060
3061         sdev_printk(KERN_INFO, sdev,
3062                     "Doing bus reset due to an I/O command timeout.\n");
3063         return pmcraid_reset_device(sdev,
3064                                     PMCRAID_RESET_BUS_TIMEOUT,
3065                                     RESET_DEVICE_BUS);
3066 }
3067
3068 static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3069 {
3070         struct Scsi_Host *shost = scmd->device->host;
3071         struct scsi_device *scsi_dev = NULL, *tmp;
3072         int ret;
3073
3074         shost_for_each_device(tmp, shost) {
3075                 if ((tmp->channel == scmd->device->channel) &&
3076                     (tmp->id == scmd->device->id)) {
3077                         scsi_dev = tmp;
3078                         break;
3079                 }
3080         }
3081         if (!scsi_dev)
3082                 return FAILED;
3083         sdev_printk(KERN_INFO, scsi_dev,
3084                     "Doing target reset due to an I/O command timeout.\n");
3085         ret = pmcraid_reset_device(scsi_dev,
3086                                    PMCRAID_INTERNAL_TIMEOUT,
3087                                    RESET_DEVICE_TARGET);
3088         scsi_device_put(scsi_dev);
3089         return ret;
3090 }
3091
3092 /**
3093  * pmcraid_eh_host_reset_handler - adapter reset handler callback
3094  *
3095  * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3096  *
3097  * Initiates adapter reset to bring it up to operational state
3098  *
3099  * Return value
3100  *      SUCCESS or FAILED
3101  */
3102 static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3103 {
3104         unsigned long interval = 10000; /* 10 seconds interval */
3105         int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3106         struct pmcraid_instance *pinstance =
3107                 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3108
3109
3110         /* wait for an additional 150 seconds just in case firmware could come
3111          * up and if it could complete all the pending commands excluding the
3112          * two HCAM (CCN and LDN).
3113          */
3114         while (waits--) {
3115                 if (atomic_read(&pinstance->outstanding_cmds) <=
3116                     PMCRAID_MAX_HCAM_CMD)
3117                         return SUCCESS;
3118                 msleep(interval);
3119         }
3120
3121         dev_err(&pinstance->pdev->dev,
3122                 "Adapter being reset due to an I/O command timeout.\n");
3123         return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3124 }
3125
3126 /**
3127  * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3128  * @cmd: pmcraid command struct
3129  * @sgcount: count of scatter-gather elements
3130  *
3131  * Return value
3132  *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
3133  *   or external IOADLs
3134  */
3135 static struct pmcraid_ioadl_desc *
3136 pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3137 {
3138         struct pmcraid_ioadl_desc *ioadl;
3139         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3140         int ioadl_count = 0;
3141
3142         if (ioarcb->add_cmd_param_length)
3143                 ioadl_count = DIV_ROUND_UP(le16_to_cpu(ioarcb->add_cmd_param_length), 16);
3144         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc) * sgcount);
3145
3146         if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3147                 /* external ioadls start at offset 0x80 from control_block
3148                  * structure, re-using 24 out of 27 ioadls part of IOARCB.
3149                  * It is necessary to indicate to firmware that driver is
3150                  * using ioadls to be treated as external to IOARCB.
3151                  */
3152                 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
3153                 ioarcb->ioadl_bus_addr =
3154                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3155                                 offsetof(struct pmcraid_ioarcb,
3156                                         add_data.u.ioadl[3]));
3157                 ioadl = &ioarcb->add_data.u.ioadl[3];
3158         } else {
3159                 ioarcb->ioadl_bus_addr =
3160                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3161                                 offsetof(struct pmcraid_ioarcb,
3162                                         add_data.u.ioadl[ioadl_count]));
3163
3164                 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3165                 ioarcb->ioarcb_bus_addr |=
3166                         cpu_to_le64(DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8));
3167         }
3168
3169         return ioadl;
3170 }
3171
3172 /**
3173  * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3174  * @pinstance: pointer to adapter instance structure
3175  * @cmd: pmcraid command struct
3176  *
3177  * This function is invoked by queuecommand entry point while sending a command
3178  * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3179  *
3180  * Return value:
3181  *      0 on success or -1 on failure
3182  */
3183 static int pmcraid_build_ioadl(
3184         struct pmcraid_instance *pinstance,
3185         struct pmcraid_cmd *cmd
3186 )
3187 {
3188         int i, nseg;
3189         struct scatterlist *sglist;
3190
3191         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3192         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3193         struct pmcraid_ioadl_desc *ioadl;
3194
3195         u32 length = scsi_bufflen(scsi_cmd);
3196
3197         if (!length)
3198                 return 0;
3199
3200         nseg = scsi_dma_map(scsi_cmd);
3201
3202         if (nseg < 0) {
3203                 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3204                 return -1;
3205         } else if (nseg > PMCRAID_MAX_IOADLS) {
3206                 scsi_dma_unmap(scsi_cmd);
3207                 scmd_printk(KERN_ERR, scsi_cmd,
3208                         "sg count is (%d) more than allowed!\n", nseg);
3209                 return -1;
3210         }
3211
3212         /* Initialize IOARCB data transfer length fields */
3213         if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3214                 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3215
3216         ioarcb->request_flags0 |= NO_LINK_DESCS;
3217         ioarcb->data_transfer_length = cpu_to_le32(length);
3218         ioadl = pmcraid_init_ioadls(cmd, nseg);
3219
3220         /* Initialize IOADL descriptor addresses */
3221         scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3222                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3223                 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3224                 ioadl[i].flags = 0;
3225         }
3226         /* setup last descriptor */
3227         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3228
3229         return 0;
3230 }
3231
3232 /**
3233  * pmcraid_queuecommand_lck - Queue a mid-layer request
3234  * @scsi_cmd: scsi command struct
3235  *
3236  * This function queues a request generated by the mid-layer. Midlayer calls
3237  * this routine within host->lock. Some of the functions called by queuecommand
3238  * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3239  *
3240  * Return value:
3241  *        0 on success
3242  *        SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3243  *        SCSI_MLQUEUE_HOST_BUSY if host is busy
3244  */
3245 static int pmcraid_queuecommand_lck(struct scsi_cmnd *scsi_cmd)
3246 {
3247         struct pmcraid_instance *pinstance;
3248         struct pmcraid_resource_entry *res;
3249         struct pmcraid_ioarcb *ioarcb;
3250         struct pmcraid_cmd *cmd;
3251         u32 fw_version;
3252         int rc = 0;
3253
3254         pinstance =
3255                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3256         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3257         res = scsi_cmd->device->hostdata;
3258         scsi_cmd->result = (DID_OK << 16);
3259
3260         /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3261          * the command
3262          */
3263         if (pinstance->ioa_state == IOA_STATE_DEAD) {
3264                 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3265                 scsi_cmd->result = (DID_NO_CONNECT << 16);
3266                 scsi_done(scsi_cmd);
3267                 return 0;
3268         }
3269
3270         /* If IOA reset is in progress, can't queue the commands */
3271         if (pinstance->ioa_reset_in_progress)
3272                 return SCSI_MLQUEUE_HOST_BUSY;
3273
3274         /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3275          * the command here itself with success return
3276          */
3277         if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3278                 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3279                 scsi_done(scsi_cmd);
3280                 return 0;
3281         }
3282
3283         /* initialize the command and IOARCB to be sent to IOA */
3284         cmd = pmcraid_get_free_cmd(pinstance);
3285
3286         if (cmd == NULL) {
3287                 pmcraid_err("free command block is not available\n");
3288                 return SCSI_MLQUEUE_HOST_BUSY;
3289         }
3290
3291         cmd->scsi_cmd = scsi_cmd;
3292         ioarcb = &(cmd->ioa_cb->ioarcb);
3293         memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3294         ioarcb->resource_handle = res->cfg_entry.resource_handle;
3295         ioarcb->request_type = REQ_TYPE_SCSI;
3296
3297         /* set hrrq number where the IOA should respond to. Note that all cmds
3298          * generated internally uses hrrq_id 0, exception to this is the cmd
3299          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3300          * hrrq_id assigned here in queuecommand
3301          */
3302         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3303                           pinstance->num_hrrq;
3304         cmd->cmd_done = pmcraid_io_done;
3305
3306         if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3307                 if (scsi_cmd->underflow == 0)
3308                         ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3309
3310                 if (res->sync_reqd) {
3311                         ioarcb->request_flags0 |= SYNC_COMPLETE;
3312                         res->sync_reqd = 0;
3313                 }
3314
3315                 ioarcb->request_flags0 |= NO_LINK_DESCS;
3316
3317                 if (scsi_cmd->flags & SCMD_TAGGED)
3318                         ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
3319
3320                 if (RES_IS_GSCSI(res->cfg_entry))
3321                         ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3322         }
3323
3324         rc = pmcraid_build_ioadl(pinstance, cmd);
3325
3326         pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3327                      le32_to_cpu(ioarcb->response_handle) >> 2,
3328                      scsi_cmd->cmnd[0], pinstance->host->unique_id,
3329                      RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3330                         PMCRAID_PHYS_BUS_ID,
3331                      RES_IS_VSET(res->cfg_entry) ?
3332                         (fw_version <= PMCRAID_FW_VERSION_1 ?
3333                                 res->cfg_entry.unique_flags1 :
3334                                 le16_to_cpu(res->cfg_entry.array_id) & 0xFF) :
3335                         RES_TARGET(res->cfg_entry.resource_address),
3336                      RES_LUN(res->cfg_entry.resource_address));
3337
3338         if (likely(rc == 0)) {
3339                 _pmcraid_fire_command(cmd);
3340         } else {
3341                 pmcraid_err("queuecommand could not build ioadl\n");
3342                 pmcraid_return_cmd(cmd);
3343                 rc = SCSI_MLQUEUE_HOST_BUSY;
3344         }
3345
3346         return rc;
3347 }
3348
3349 static DEF_SCSI_QCMD(pmcraid_queuecommand)
3350
3351 /*
3352  * pmcraid_open -char node "open" entry, allowed only users with admin access
3353  */
3354 static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3355 {
3356         struct pmcraid_instance *pinstance;
3357
3358         if (!capable(CAP_SYS_ADMIN))
3359                 return -EACCES;
3360
3361         /* Populate adapter instance * pointer for use by ioctl */
3362         pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3363         filep->private_data = pinstance;
3364
3365         return 0;
3366 }
3367
3368 /*
3369  * pmcraid_fasync - Async notifier registration from applications
3370  *
3371  * This function adds the calling process to a driver global queue. When an
3372  * event occurs, SIGIO will be sent to all processes in this queue.
3373  */
3374 static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3375 {
3376         struct pmcraid_instance *pinstance;
3377         int rc;
3378
3379         pinstance = filep->private_data;
3380         mutex_lock(&pinstance->aen_queue_lock);
3381         rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3382         mutex_unlock(&pinstance->aen_queue_lock);
3383
3384         return rc;
3385 }
3386
3387 /**
3388  * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3389  *
3390  * @pinstance: pointer to adapter instance structure
3391  * @cmd: ioctl command passed in
3392  * @buflen: length of user_buffer
3393  * @user_buffer: user buffer pointer
3394  *
3395  * Return Value
3396  *   0 in case of success, otherwise appropriate error code
3397  */
3398 static long pmcraid_ioctl_driver(
3399         struct pmcraid_instance *pinstance,
3400         unsigned int cmd,
3401         unsigned int buflen,
3402         void __user *user_buffer
3403 )
3404 {
3405         int rc = -ENOSYS;
3406
3407         switch (cmd) {
3408         case PMCRAID_IOCTL_RESET_ADAPTER:
3409                 pmcraid_reset_bringup(pinstance);
3410                 rc = 0;
3411                 break;
3412
3413         default:
3414                 break;
3415         }
3416
3417         return rc;
3418 }
3419
3420 /**
3421  * pmcraid_check_ioctl_buffer - check for proper access to user buffer
3422  *
3423  * @cmd: ioctl command
3424  * @arg: user buffer
3425  * @hdr: pointer to kernel memory for pmcraid_ioctl_header
3426  *
3427  * Return Value
3428  *      negetive error code if there are access issues, otherwise zero.
3429  *      Upon success, returns ioctl header copied out of user buffer.
3430  */
3431
3432 static int pmcraid_check_ioctl_buffer(
3433         int cmd,
3434         void __user *arg,
3435         struct pmcraid_ioctl_header *hdr
3436 )
3437 {
3438         int rc;
3439
3440         if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
3441                 pmcraid_err("couldn't copy ioctl header from user buffer\n");
3442                 return -EFAULT;
3443         }
3444
3445         /* check for valid driver signature */
3446         rc = memcmp(hdr->signature,
3447                     PMCRAID_IOCTL_SIGNATURE,
3448                     sizeof(hdr->signature));
3449         if (rc) {
3450                 pmcraid_err("signature verification failed\n");
3451                 return -EINVAL;
3452         }
3453
3454         return 0;
3455 }
3456
3457 /*
3458  *  pmcraid_ioctl - char node ioctl entry point
3459  */
3460 static long pmcraid_chr_ioctl(
3461         struct file *filep,
3462         unsigned int cmd,
3463         unsigned long arg
3464 )
3465 {
3466         struct pmcraid_instance *pinstance = NULL;
3467         struct pmcraid_ioctl_header *hdr = NULL;
3468         void __user *argp = (void __user *)arg;
3469         int retval = -ENOTTY;
3470
3471         hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
3472
3473         if (!hdr) {
3474                 pmcraid_err("failed to allocate memory for ioctl header\n");
3475                 return -ENOMEM;
3476         }
3477
3478         retval = pmcraid_check_ioctl_buffer(cmd, argp, hdr);
3479
3480         if (retval) {
3481                 pmcraid_info("chr_ioctl: header check failed\n");
3482                 kfree(hdr);
3483                 return retval;
3484         }
3485
3486         pinstance = filep->private_data;
3487
3488         if (!pinstance) {
3489                 pmcraid_info("adapter instance is not found\n");
3490                 kfree(hdr);
3491                 return -ENOTTY;
3492         }
3493
3494         switch (_IOC_TYPE(cmd)) {
3495
3496         case PMCRAID_DRIVER_IOCTL:
3497                 arg += sizeof(struct pmcraid_ioctl_header);
3498                 retval = pmcraid_ioctl_driver(pinstance, cmd,
3499                                               hdr->buffer_length, argp);
3500                 break;
3501
3502         default:
3503                 retval = -ENOTTY;
3504                 break;
3505         }
3506
3507         kfree(hdr);
3508
3509         return retval;
3510 }
3511
3512 /*
3513  * File operations structure for management interface
3514  */
3515 static const struct file_operations pmcraid_fops = {
3516         .owner = THIS_MODULE,
3517         .open = pmcraid_chr_open,
3518         .fasync = pmcraid_chr_fasync,
3519         .unlocked_ioctl = pmcraid_chr_ioctl,
3520         .compat_ioctl = compat_ptr_ioctl,
3521         .llseek = noop_llseek,
3522 };
3523
3524
3525
3526
3527 /**
3528  * pmcraid_show_log_level - Display adapter's error logging level
3529  * @dev: class device struct
3530  * @attr: unused
3531  * @buf: buffer
3532  *
3533  * Return value:
3534  *  number of bytes printed to buffer
3535  */
3536 static ssize_t pmcraid_show_log_level(
3537         struct device *dev,
3538         struct device_attribute *attr,
3539         char *buf)
3540 {
3541         struct Scsi_Host *shost = class_to_shost(dev);
3542         struct pmcraid_instance *pinstance =
3543                 (struct pmcraid_instance *)shost->hostdata;
3544         return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
3545 }
3546
3547 /**
3548  * pmcraid_store_log_level - Change the adapter's error logging level
3549  * @dev: class device struct
3550  * @attr: unused
3551  * @buf: buffer
3552  * @count: not used
3553  *
3554  * Return value:
3555  *  number of bytes printed to buffer
3556  */
3557 static ssize_t pmcraid_store_log_level(
3558         struct device *dev,
3559         struct device_attribute *attr,
3560         const char *buf,
3561         size_t count
3562 )
3563 {
3564         struct Scsi_Host *shost;
3565         struct pmcraid_instance *pinstance;
3566         u8 val;
3567
3568         if (kstrtou8(buf, 10, &val))
3569                 return -EINVAL;
3570         /* log-level should be from 0 to 2 */
3571         if (val > 2)
3572                 return -EINVAL;
3573
3574         shost = class_to_shost(dev);
3575         pinstance = (struct pmcraid_instance *)shost->hostdata;
3576         pinstance->current_log_level = val;
3577
3578         return strlen(buf);
3579 }
3580
3581 static struct device_attribute pmcraid_log_level_attr = {
3582         .attr = {
3583                  .name = "log_level",
3584                  .mode = S_IRUGO | S_IWUSR,
3585                  },
3586         .show = pmcraid_show_log_level,
3587         .store = pmcraid_store_log_level,
3588 };
3589
3590 /**
3591  * pmcraid_show_drv_version - Display driver version
3592  * @dev: class device struct
3593  * @attr: unused
3594  * @buf: buffer
3595  *
3596  * Return value:
3597  *  number of bytes printed to buffer
3598  */
3599 static ssize_t pmcraid_show_drv_version(
3600         struct device *dev,
3601         struct device_attribute *attr,
3602         char *buf
3603 )
3604 {
3605         return snprintf(buf, PAGE_SIZE, "version: %s\n",
3606                         PMCRAID_DRIVER_VERSION);
3607 }
3608
3609 static struct device_attribute pmcraid_driver_version_attr = {
3610         .attr = {
3611                  .name = "drv_version",
3612                  .mode = S_IRUGO,
3613                  },
3614         .show = pmcraid_show_drv_version,
3615 };
3616
3617 /**
3618  * pmcraid_show_adapter_id - Display driver assigned adapter id
3619  * @dev: class device struct
3620  * @attr: unused
3621  * @buf: buffer
3622  *
3623  * Return value:
3624  *  number of bytes printed to buffer
3625  */
3626 static ssize_t pmcraid_show_adapter_id(
3627         struct device *dev,
3628         struct device_attribute *attr,
3629         char *buf
3630 )
3631 {
3632         struct Scsi_Host *shost = class_to_shost(dev);
3633         struct pmcraid_instance *pinstance =
3634                 (struct pmcraid_instance *)shost->hostdata;
3635         u32 adapter_id = pci_dev_id(pinstance->pdev);
3636         u32 aen_group = pmcraid_event_family.id;
3637
3638         return snprintf(buf, PAGE_SIZE,
3639                         "adapter id: %d\nminor: %d\naen group: %d\n",
3640                         adapter_id, MINOR(pinstance->cdev.dev), aen_group);
3641 }
3642
3643 static struct device_attribute pmcraid_adapter_id_attr = {
3644         .attr = {
3645                  .name = "adapter_id",
3646                  .mode = S_IRUGO,
3647                  },
3648         .show = pmcraid_show_adapter_id,
3649 };
3650
3651 static struct attribute *pmcraid_host_attrs[] = {
3652         &pmcraid_log_level_attr.attr,
3653         &pmcraid_driver_version_attr.attr,
3654         &pmcraid_adapter_id_attr.attr,
3655         NULL,
3656 };
3657
3658 ATTRIBUTE_GROUPS(pmcraid_host);
3659
3660 /* host template structure for pmcraid driver */
3661 static const struct scsi_host_template pmcraid_host_template = {
3662         .module = THIS_MODULE,
3663         .name = PMCRAID_DRIVER_NAME,
3664         .queuecommand = pmcraid_queuecommand,
3665         .eh_abort_handler = pmcraid_eh_abort_handler,
3666         .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
3667         .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
3668         .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
3669         .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
3670
3671         .slave_alloc = pmcraid_slave_alloc,
3672         .device_configure = pmcraid_device_configure,
3673         .slave_destroy = pmcraid_slave_destroy,
3674         .change_queue_depth = pmcraid_change_queue_depth,
3675         .can_queue = PMCRAID_MAX_IO_CMD,
3676         .this_id = -1,
3677         .sg_tablesize = PMCRAID_MAX_IOADLS,
3678         .max_sectors = PMCRAID_IOA_MAX_SECTORS,
3679         .no_write_same = 1,
3680         .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
3681         .shost_groups = pmcraid_host_groups,
3682         .proc_name = PMCRAID_DRIVER_NAME,
3683 };
3684
3685 /*
3686  * pmcraid_isr_msix - implements MSI-X interrupt handling routine
3687  * @irq: interrupt vector number
3688  * @dev_id: pointer hrrq_vector
3689  *
3690  * Return Value
3691  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
3692  */
3693
3694 static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
3695 {
3696         struct pmcraid_isr_param *hrrq_vector;
3697         struct pmcraid_instance *pinstance;
3698         unsigned long lock_flags;
3699         u32 intrs_val;
3700         int hrrq_id;
3701
3702         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
3703         hrrq_id = hrrq_vector->hrrq_id;
3704         pinstance = hrrq_vector->drv_inst;
3705
3706         if (!hrrq_id) {
3707                 /* Read the interrupt */
3708                 intrs_val = pmcraid_read_interrupts(pinstance);
3709                 if (intrs_val &&
3710                         ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
3711                         & DOORBELL_INTR_MSIX_CLR) == 0)) {
3712                         /* Any error interrupts including unit_check,
3713                          * initiate IOA reset.In case of unit check indicate
3714                          * to reset_sequence that IOA unit checked and prepare
3715                          * for a dump during reset sequence
3716                          */
3717                         if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
3718                                 if (intrs_val & INTRS_IOA_UNIT_CHECK)
3719                                         pinstance->ioa_unit_check = 1;
3720
3721                                 pmcraid_err("ISR: error interrupts: %x \
3722                                         initiating reset\n", intrs_val);
3723                                 spin_lock_irqsave(pinstance->host->host_lock,
3724                                         lock_flags);
3725                                 pmcraid_initiate_reset(pinstance);
3726                                 spin_unlock_irqrestore(
3727                                         pinstance->host->host_lock,
3728                                         lock_flags);
3729                         }
3730                         /* If interrupt was as part of the ioa initialization,
3731                          * clear it. Delete the timer and wakeup the
3732                          * reset engine to proceed with reset sequence
3733                          */
3734                         if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
3735                                 pmcraid_clr_trans_op(pinstance);
3736
3737                         /* Clear the interrupt register by writing
3738                          * to host to ioa doorbell. Once done
3739                          * FW will clear the interrupt.
3740                          */
3741                         iowrite32(DOORBELL_INTR_MSIX_CLR,
3742                                 pinstance->int_regs.host_ioa_interrupt_reg);
3743                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
3744
3745
3746                 }
3747         }
3748
3749         tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
3750
3751         return IRQ_HANDLED;
3752 }
3753
3754 /**
3755  * pmcraid_isr  - implements legacy interrupt handling routine
3756  *
3757  * @irq: interrupt vector number
3758  * @dev_id: pointer hrrq_vector
3759  *
3760  * Return Value
3761  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
3762  */
3763 static irqreturn_t pmcraid_isr(int irq, void *dev_id)
3764 {
3765         struct pmcraid_isr_param *hrrq_vector;
3766         struct pmcraid_instance *pinstance;
3767         u32 intrs;
3768         unsigned long lock_flags;
3769         int hrrq_id = 0;
3770
3771         /* In case of legacy interrupt mode where interrupts are shared across
3772          * isrs, it may be possible that the current interrupt is not from IOA
3773          */
3774         if (!dev_id) {
3775                 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
3776                 return IRQ_NONE;
3777         }
3778         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
3779         pinstance = hrrq_vector->drv_inst;
3780
3781         intrs = pmcraid_read_interrupts(pinstance);
3782
3783         if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
3784                 return IRQ_NONE;
3785
3786         /* Any error interrupts including unit_check, initiate IOA reset.
3787          * In case of unit check indicate to reset_sequence that IOA unit
3788          * checked and prepare for a dump during reset sequence
3789          */
3790         if (intrs & PMCRAID_ERROR_INTERRUPTS) {
3791
3792                 if (intrs & INTRS_IOA_UNIT_CHECK)
3793                         pinstance->ioa_unit_check = 1;
3794
3795                 iowrite32(intrs,
3796                           pinstance->int_regs.ioa_host_interrupt_clr_reg);
3797                 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
3798                             intrs);
3799                 intrs = ioread32(
3800                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3801                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3802                 pmcraid_initiate_reset(pinstance);
3803                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3804         } else {
3805                 /* If interrupt was as part of the ioa initialization,
3806                  * clear. Delete the timer and wakeup the
3807                  * reset engine to proceed with reset sequence
3808                  */
3809                 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
3810                         pmcraid_clr_trans_op(pinstance);
3811                 } else {
3812                         iowrite32(intrs,
3813                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3814                         ioread32(
3815                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3816
3817                         tasklet_schedule(
3818                                         &(pinstance->isr_tasklet[hrrq_id]));
3819                 }
3820         }
3821
3822         return IRQ_HANDLED;
3823 }
3824
3825
3826 /**
3827  * pmcraid_worker_function -  worker thread function
3828  *
3829  * @workp: pointer to struct work queue
3830  *
3831  * Return Value
3832  *       None
3833  */
3834
3835 static void pmcraid_worker_function(struct work_struct *workp)
3836 {
3837         struct pmcraid_instance *pinstance;
3838         struct pmcraid_resource_entry *res;
3839         struct pmcraid_resource_entry *temp;
3840         struct scsi_device *sdev;
3841         unsigned long lock_flags;
3842         unsigned long host_lock_flags;
3843         u16 fw_version;
3844         u8 bus, target, lun;
3845
3846         pinstance = container_of(workp, struct pmcraid_instance, worker_q);
3847         /* add resources only after host is added into system */
3848         if (!atomic_read(&pinstance->expose_resources))
3849                 return;
3850
3851         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3852
3853         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
3854         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
3855
3856                 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
3857                         sdev = res->scsi_dev;
3858
3859                         /* host_lock must be held before calling
3860                          * scsi_device_get
3861                          */
3862                         spin_lock_irqsave(pinstance->host->host_lock,
3863                                           host_lock_flags);
3864                         if (!scsi_device_get(sdev)) {
3865                                 spin_unlock_irqrestore(
3866                                                 pinstance->host->host_lock,
3867                                                 host_lock_flags);
3868                                 pmcraid_info("deleting %x from midlayer\n",
3869                                              res->cfg_entry.resource_address);
3870                                 list_move_tail(&res->queue,
3871                                                 &pinstance->free_res_q);
3872                                 spin_unlock_irqrestore(
3873                                         &pinstance->resource_lock,
3874                                         lock_flags);
3875                                 scsi_remove_device(sdev);
3876                                 scsi_device_put(sdev);
3877                                 spin_lock_irqsave(&pinstance->resource_lock,
3878                                                    lock_flags);
3879                                 res->change_detected = 0;
3880                         } else {
3881                                 spin_unlock_irqrestore(
3882                                                 pinstance->host->host_lock,
3883                                                 host_lock_flags);
3884                         }
3885                 }
3886         }
3887
3888         list_for_each_entry(res, &pinstance->used_res_q, queue) {
3889
3890                 if (res->change_detected == RES_CHANGE_ADD) {
3891
3892                         if (!pmcraid_expose_resource(fw_version,
3893                                                      &res->cfg_entry))
3894                                 continue;
3895
3896                         if (RES_IS_VSET(res->cfg_entry)) {
3897                                 bus = PMCRAID_VSET_BUS_ID;
3898                                 if (fw_version <= PMCRAID_FW_VERSION_1)
3899                                         target = res->cfg_entry.unique_flags1;
3900                                 else
3901                                         target = le16_to_cpu(res->cfg_entry.array_id) & 0xFF;
3902                                 lun = PMCRAID_VSET_LUN_ID;
3903                         } else {
3904                                 bus = PMCRAID_PHYS_BUS_ID;
3905                                 target =
3906                                      RES_TARGET(
3907                                         res->cfg_entry.resource_address);
3908                                 lun = RES_LUN(res->cfg_entry.resource_address);
3909                         }
3910
3911                         res->change_detected = 0;
3912                         spin_unlock_irqrestore(&pinstance->resource_lock,
3913                                                 lock_flags);
3914                         scsi_add_device(pinstance->host, bus, target, lun);
3915                         spin_lock_irqsave(&pinstance->resource_lock,
3916                                            lock_flags);
3917                 }
3918         }
3919
3920         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
3921 }
3922
3923 /**
3924  * pmcraid_tasklet_function - Tasklet function
3925  *
3926  * @instance: pointer to msix param structure
3927  *
3928  * Return Value
3929  *      None
3930  */
3931 static void pmcraid_tasklet_function(unsigned long instance)
3932 {
3933         struct pmcraid_isr_param *hrrq_vector;
3934         struct pmcraid_instance *pinstance;
3935         unsigned long hrrq_lock_flags;
3936         unsigned long pending_lock_flags;
3937         unsigned long host_lock_flags;
3938         spinlock_t *lockp; /* hrrq buffer lock */
3939         int id;
3940         u32 resp;
3941
3942         hrrq_vector = (struct pmcraid_isr_param *)instance;
3943         pinstance = hrrq_vector->drv_inst;
3944         id = hrrq_vector->hrrq_id;
3945         lockp = &(pinstance->hrrq_lock[id]);
3946
3947         /* loop through each of the commands responded by IOA. Each HRRQ buf is
3948          * protected by its own lock. Traversals must be done within this lock
3949          * as there may be multiple tasklets running on multiple CPUs. Note
3950          * that the lock is held just for picking up the response handle and
3951          * manipulating hrrq_curr/toggle_bit values.
3952          */
3953         spin_lock_irqsave(lockp, hrrq_lock_flags);
3954
3955         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
3956
3957         while ((resp & HRRQ_TOGGLE_BIT) ==
3958                 pinstance->host_toggle_bit[id]) {
3959
3960                 int cmd_index = resp >> 2;
3961                 struct pmcraid_cmd *cmd = NULL;
3962
3963                 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
3964                         pinstance->hrrq_curr[id]++;
3965                 } else {
3966                         pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
3967                         pinstance->host_toggle_bit[id] ^= 1u;
3968                 }
3969
3970                 if (cmd_index >= PMCRAID_MAX_CMD) {
3971                         /* In case of invalid response handle, log message */
3972                         pmcraid_err("Invalid response handle %d\n", cmd_index);
3973                         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
3974                         continue;
3975                 }
3976
3977                 cmd = pinstance->cmd_list[cmd_index];
3978                 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
3979
3980                 spin_lock_irqsave(&pinstance->pending_pool_lock,
3981                                    pending_lock_flags);
3982                 list_del(&cmd->free_list);
3983                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3984                                         pending_lock_flags);
3985                 del_timer(&cmd->timer);
3986                 atomic_dec(&pinstance->outstanding_cmds);
3987
3988                 if (cmd->cmd_done == pmcraid_ioa_reset) {
3989                         spin_lock_irqsave(pinstance->host->host_lock,
3990                                           host_lock_flags);
3991                         cmd->cmd_done(cmd);
3992                         spin_unlock_irqrestore(pinstance->host->host_lock,
3993                                                host_lock_flags);
3994                 } else if (cmd->cmd_done != NULL) {
3995                         cmd->cmd_done(cmd);
3996                 }
3997                 /* loop over until we are done with all responses */
3998                 spin_lock_irqsave(lockp, hrrq_lock_flags);
3999                 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4000         }
4001
4002         spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4003 }
4004
4005 /**
4006  * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4007  * @pinstance: pointer to adapter instance structure
4008  *
4009  * This routine un-registers registered interrupt handler and
4010  * also frees irqs/vectors.
4011  *
4012  * Retun Value
4013  *      None
4014  */
4015 static
4016 void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4017 {
4018         struct pci_dev *pdev = pinstance->pdev;
4019         int i;
4020
4021         for (i = 0; i < pinstance->num_hrrq; i++)
4022                 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4023
4024         pinstance->interrupt_mode = 0;
4025         pci_free_irq_vectors(pdev);
4026 }
4027
4028 /**
4029  * pmcraid_register_interrupt_handler - registers interrupt handler
4030  * @pinstance: pointer to per-adapter instance structure
4031  *
4032  * Return Value
4033  *      0 on success, non-zero error code otherwise.
4034  */
4035 static int
4036 pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4037 {
4038         struct pci_dev *pdev = pinstance->pdev;
4039         unsigned int irq_flag = PCI_IRQ_INTX, flag;
4040         int num_hrrq, rc, i;
4041         irq_handler_t isr;
4042
4043         if (pmcraid_enable_msix)
4044                 irq_flag |= PCI_IRQ_MSIX;
4045
4046         num_hrrq = pci_alloc_irq_vectors(pdev, 1, PMCRAID_NUM_MSIX_VECTORS,
4047                         irq_flag);
4048         if (num_hrrq < 0)
4049                 return num_hrrq;
4050
4051         if (pdev->msix_enabled) {
4052                 flag = 0;
4053                 isr = pmcraid_isr_msix;
4054         } else {
4055                 flag = IRQF_SHARED;
4056                 isr = pmcraid_isr;
4057         }
4058
4059         for (i = 0; i < num_hrrq; i++) {
4060                 struct pmcraid_isr_param *vec = &pinstance->hrrq_vector[i];
4061
4062                 vec->hrrq_id = i;
4063                 vec->drv_inst = pinstance;
4064                 rc = request_irq(pci_irq_vector(pdev, i), isr, flag,
4065                                 PMCRAID_DRIVER_NAME, vec);
4066                 if (rc)
4067                         goto out_unwind;
4068         }
4069
4070         pinstance->num_hrrq = num_hrrq;
4071         if (pdev->msix_enabled) {
4072                 pinstance->interrupt_mode = 1;
4073                 iowrite32(DOORBELL_INTR_MODE_MSIX,
4074                           pinstance->int_regs.host_ioa_interrupt_reg);
4075                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4076         }
4077
4078         return 0;
4079
4080 out_unwind:
4081         while (--i >= 0)
4082                 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4083         pci_free_irq_vectors(pdev);
4084         return rc;
4085 }
4086
4087 /**
4088  * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4089  * @pinstance: per adapter instance structure pointer
4090  * @max_index: number of buffer blocks to release
4091  *
4092  * Return Value
4093  *  None
4094  */
4095 static void
4096 pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4097 {
4098         int i;
4099         for (i = 0; i < max_index; i++) {
4100                 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4101                 pinstance->cmd_list[i] = NULL;
4102         }
4103         kmem_cache_destroy(pinstance->cmd_cachep);
4104         pinstance->cmd_cachep = NULL;
4105 }
4106
4107 /**
4108  * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4109  * @pinstance: pointer to per adapter instance structure
4110  * @max_index: number of buffers (from 0 onwards) to release
4111  *
4112  * This function assumes that the command blocks for which control blocks are
4113  * linked are not released.
4114  *
4115  * Return Value
4116  *       None
4117  */
4118 static void
4119 pmcraid_release_control_blocks(
4120         struct pmcraid_instance *pinstance,
4121         int max_index
4122 )
4123 {
4124         int i;
4125
4126         if (pinstance->control_pool == NULL)
4127                 return;
4128
4129         for (i = 0; i < max_index; i++) {
4130                 dma_pool_free(pinstance->control_pool,
4131                               pinstance->cmd_list[i]->ioa_cb,
4132                               pinstance->cmd_list[i]->ioa_cb_bus_addr);
4133                 pinstance->cmd_list[i]->ioa_cb = NULL;
4134                 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4135         }
4136         dma_pool_destroy(pinstance->control_pool);
4137         pinstance->control_pool = NULL;
4138 }
4139
4140 /**
4141  * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4142  * @pinstance: pointer to per adapter instance structure
4143  *
4144  * Allocates memory for command blocks using kernel slab allocator.
4145  *
4146  * Return Value
4147  *      0 in case of success; -ENOMEM in case of failure
4148  */
4149 static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4150 {
4151         int i;
4152
4153         sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4154                 pinstance->host->unique_id);
4155
4156
4157         pinstance->cmd_cachep = kmem_cache_create(
4158                                         pinstance->cmd_pool_name,
4159                                         sizeof(struct pmcraid_cmd), 0,
4160                                         SLAB_HWCACHE_ALIGN, NULL);
4161         if (!pinstance->cmd_cachep)
4162                 return -ENOMEM;
4163
4164         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4165                 pinstance->cmd_list[i] =
4166                         kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4167                 if (!pinstance->cmd_list[i]) {
4168                         pmcraid_release_cmd_blocks(pinstance, i);
4169                         return -ENOMEM;
4170                 }
4171         }
4172         return 0;
4173 }
4174
4175 /**
4176  * pmcraid_allocate_control_blocks - allocates memory control blocks
4177  * @pinstance : pointer to per adapter instance structure
4178  *
4179  * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4180  * and IOASAs. This is called after command blocks are already allocated.
4181  *
4182  * Return Value
4183  *  0 in case it can allocate all control blocks, otherwise -ENOMEM
4184  */
4185 static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4186 {
4187         int i;
4188
4189         sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4190                 pinstance->host->unique_id);
4191
4192         pinstance->control_pool =
4193                 dma_pool_create(pinstance->ctl_pool_name,
4194                                 &pinstance->pdev->dev,
4195                                 sizeof(struct pmcraid_control_block),
4196                                 PMCRAID_IOARCB_ALIGNMENT, 0);
4197
4198         if (!pinstance->control_pool)
4199                 return -ENOMEM;
4200
4201         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4202                 pinstance->cmd_list[i]->ioa_cb =
4203                         dma_pool_zalloc(
4204                                 pinstance->control_pool,
4205                                 GFP_KERNEL,
4206                                 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4207
4208                 if (!pinstance->cmd_list[i]->ioa_cb) {
4209                         pmcraid_release_control_blocks(pinstance, i);
4210                         return -ENOMEM;
4211                 }
4212         }
4213         return 0;
4214 }
4215
4216 /**
4217  * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4218  * @pinstance: pointer to per adapter instance structure
4219  * @maxindex: size of hrrq buffer pointer array
4220  *
4221  * Return Value
4222  *      None
4223  */
4224 static void
4225 pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4226 {
4227         int i;
4228
4229         for (i = 0; i < maxindex; i++) {
4230                 dma_free_coherent(&pinstance->pdev->dev,
4231                                     HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4232                                     pinstance->hrrq_start[i],
4233                                     pinstance->hrrq_start_bus_addr[i]);
4234
4235                 /* reset pointers and toggle bit to zeros */
4236                 pinstance->hrrq_start[i] = NULL;
4237                 pinstance->hrrq_start_bus_addr[i] = 0;
4238                 pinstance->host_toggle_bit[i] = 0;
4239         }
4240 }
4241
4242 /**
4243  * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4244  * @pinstance: pointer to per adapter instance structure
4245  *
4246  * Return value
4247  *      0 hrrq buffers are allocated, -ENOMEM otherwise.
4248  */
4249 static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4250 {
4251         int i, buffer_size;
4252
4253         buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4254
4255         for (i = 0; i < pinstance->num_hrrq; i++) {
4256                 pinstance->hrrq_start[i] =
4257                         dma_alloc_coherent(&pinstance->pdev->dev, buffer_size,
4258                                            &pinstance->hrrq_start_bus_addr[i],
4259                                            GFP_KERNEL);
4260                 if (!pinstance->hrrq_start[i]) {
4261                         pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4262                                     i);
4263                         pmcraid_release_host_rrqs(pinstance, i);
4264                         return -ENOMEM;
4265                 }
4266
4267                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4268                 pinstance->hrrq_end[i] =
4269                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4270                 pinstance->host_toggle_bit[i] = 1;
4271                 spin_lock_init(&pinstance->hrrq_lock[i]);
4272         }
4273         return 0;
4274 }
4275
4276 /**
4277  * pmcraid_release_hcams - release HCAM buffers
4278  *
4279  * @pinstance: pointer to per adapter instance structure
4280  *
4281  * Return value
4282  *  none
4283  */
4284 static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4285 {
4286         if (pinstance->ccn.msg != NULL) {
4287                 dma_free_coherent(&pinstance->pdev->dev,
4288                                     PMCRAID_AEN_HDR_SIZE +
4289                                     sizeof(struct pmcraid_hcam_ccn_ext),
4290                                     pinstance->ccn.msg,
4291                                     pinstance->ccn.baddr);
4292
4293                 pinstance->ccn.msg = NULL;
4294                 pinstance->ccn.hcam = NULL;
4295                 pinstance->ccn.baddr = 0;
4296         }
4297
4298         if (pinstance->ldn.msg != NULL) {
4299                 dma_free_coherent(&pinstance->pdev->dev,
4300                                     PMCRAID_AEN_HDR_SIZE +
4301                                     sizeof(struct pmcraid_hcam_ldn),
4302                                     pinstance->ldn.msg,
4303                                     pinstance->ldn.baddr);
4304
4305                 pinstance->ldn.msg = NULL;
4306                 pinstance->ldn.hcam = NULL;
4307                 pinstance->ldn.baddr = 0;
4308         }
4309 }
4310
4311 /**
4312  * pmcraid_allocate_hcams - allocates HCAM buffers
4313  * @pinstance : pointer to per adapter instance structure
4314  *
4315  * Return Value:
4316  *   0 in case of successful allocation, non-zero otherwise
4317  */
4318 static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4319 {
4320         pinstance->ccn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4321                                         PMCRAID_AEN_HDR_SIZE +
4322                                         sizeof(struct pmcraid_hcam_ccn_ext),
4323                                         &pinstance->ccn.baddr, GFP_KERNEL);
4324
4325         pinstance->ldn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4326                                         PMCRAID_AEN_HDR_SIZE +
4327                                         sizeof(struct pmcraid_hcam_ldn),
4328                                         &pinstance->ldn.baddr, GFP_KERNEL);
4329
4330         if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4331                 pmcraid_release_hcams(pinstance);
4332         } else {
4333                 pinstance->ccn.hcam =
4334                         (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
4335                 pinstance->ldn.hcam =
4336                         (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
4337
4338                 atomic_set(&pinstance->ccn.ignore, 0);
4339                 atomic_set(&pinstance->ldn.ignore, 0);
4340         }
4341
4342         return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
4343 }
4344
4345 /**
4346  * pmcraid_release_config_buffers - release config.table buffers
4347  * @pinstance: pointer to per adapter instance structure
4348  *
4349  * Return Value
4350  *       none
4351  */
4352 static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
4353 {
4354         if (pinstance->cfg_table != NULL &&
4355             pinstance->cfg_table_bus_addr != 0) {
4356                 dma_free_coherent(&pinstance->pdev->dev,
4357                                     sizeof(struct pmcraid_config_table),
4358                                     pinstance->cfg_table,
4359                                     pinstance->cfg_table_bus_addr);
4360                 pinstance->cfg_table = NULL;
4361                 pinstance->cfg_table_bus_addr = 0;
4362         }
4363
4364         if (pinstance->res_entries != NULL) {
4365                 int i;
4366
4367                 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4368                         list_del(&pinstance->res_entries[i].queue);
4369                 kfree(pinstance->res_entries);
4370                 pinstance->res_entries = NULL;
4371         }
4372
4373         pmcraid_release_hcams(pinstance);
4374 }
4375
4376 /**
4377  * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
4378  * @pinstance : pointer to per adapter instance structure
4379  *
4380  * Return Value
4381  *      0 for successful allocation, -ENOMEM for any failure
4382  */
4383 static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
4384 {
4385         int i;
4386
4387         pinstance->res_entries =
4388                         kcalloc(PMCRAID_MAX_RESOURCES,
4389                                 sizeof(struct pmcraid_resource_entry),
4390                                 GFP_KERNEL);
4391
4392         if (NULL == pinstance->res_entries) {
4393                 pmcraid_err("failed to allocate memory for resource table\n");
4394                 return -ENOMEM;
4395         }
4396
4397         for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4398                 list_add_tail(&pinstance->res_entries[i].queue,
4399                               &pinstance->free_res_q);
4400
4401         pinstance->cfg_table = dma_alloc_coherent(&pinstance->pdev->dev,
4402                                      sizeof(struct pmcraid_config_table),
4403                                      &pinstance->cfg_table_bus_addr,
4404                                      GFP_KERNEL);
4405
4406         if (NULL == pinstance->cfg_table) {
4407                 pmcraid_err("couldn't alloc DMA memory for config table\n");
4408                 pmcraid_release_config_buffers(pinstance);
4409                 return -ENOMEM;
4410         }
4411
4412         if (pmcraid_allocate_hcams(pinstance)) {
4413                 pmcraid_err("could not alloc DMA memory for HCAMS\n");
4414                 pmcraid_release_config_buffers(pinstance);
4415                 return -ENOMEM;
4416         }
4417
4418         return 0;
4419 }
4420
4421 /**
4422  * pmcraid_init_tasklets - registers tasklets for response handling
4423  *
4424  * @pinstance: pointer adapter instance structure
4425  *
4426  * Return value
4427  *      none
4428  */
4429 static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
4430 {
4431         int i;
4432         for (i = 0; i < pinstance->num_hrrq; i++)
4433                 tasklet_init(&pinstance->isr_tasklet[i],
4434                              pmcraid_tasklet_function,
4435                              (unsigned long)&pinstance->hrrq_vector[i]);
4436 }
4437
4438 /**
4439  * pmcraid_kill_tasklets - destroys tasklets registered for response handling
4440  *
4441  * @pinstance: pointer to adapter instance structure
4442  *
4443  * Return value
4444  *      none
4445  */
4446 static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
4447 {
4448         int i;
4449         for (i = 0; i < pinstance->num_hrrq; i++)
4450                 tasklet_kill(&pinstance->isr_tasklet[i]);
4451 }
4452
4453 /**
4454  * pmcraid_release_buffers - release per-adapter buffers allocated
4455  *
4456  * @pinstance: pointer to adapter soft state
4457  *
4458  * Return Value
4459  *      none
4460  */
4461 static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
4462 {
4463         pmcraid_release_config_buffers(pinstance);
4464         pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
4465         pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4466         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4467
4468         if (pinstance->inq_data != NULL) {
4469                 dma_free_coherent(&pinstance->pdev->dev,
4470                                     sizeof(struct pmcraid_inquiry_data),
4471                                     pinstance->inq_data,
4472                                     pinstance->inq_data_baddr);
4473
4474                 pinstance->inq_data = NULL;
4475                 pinstance->inq_data_baddr = 0;
4476         }
4477
4478         if (pinstance->timestamp_data != NULL) {
4479                 dma_free_coherent(&pinstance->pdev->dev,
4480                                     sizeof(struct pmcraid_timestamp_data),
4481                                     pinstance->timestamp_data,
4482                                     pinstance->timestamp_data_baddr);
4483
4484                 pinstance->timestamp_data = NULL;
4485                 pinstance->timestamp_data_baddr = 0;
4486         }
4487 }
4488
4489 /**
4490  * pmcraid_init_buffers - allocates memory and initializes various structures
4491  * @pinstance: pointer to per adapter instance structure
4492  *
4493  * This routine pre-allocates memory based on the type of block as below:
4494  * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
4495  * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
4496  * config-table entries      : DMAable memory using dma_alloc_coherent
4497  * HostRRQs                  : DMAable memory, using dma_alloc_coherent
4498  *
4499  * Return Value
4500  *       0 in case all of the blocks are allocated, -ENOMEM otherwise.
4501  */
4502 static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
4503 {
4504         int i;
4505
4506         if (pmcraid_allocate_host_rrqs(pinstance)) {
4507                 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
4508                              pinstance->num_hrrq);
4509                 return -ENOMEM;
4510         }
4511
4512         if (pmcraid_allocate_config_buffers(pinstance)) {
4513                 pmcraid_err("couldn't allocate memory for config buffers\n");
4514                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4515                 return -ENOMEM;
4516         }
4517
4518         if (pmcraid_allocate_cmd_blocks(pinstance)) {
4519                 pmcraid_err("couldn't allocate memory for cmd blocks\n");
4520                 pmcraid_release_config_buffers(pinstance);
4521                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4522                 return -ENOMEM;
4523         }
4524
4525         if (pmcraid_allocate_control_blocks(pinstance)) {
4526                 pmcraid_err("couldn't allocate memory control blocks\n");
4527                 pmcraid_release_config_buffers(pinstance);
4528                 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4529                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4530                 return -ENOMEM;
4531         }
4532
4533         /* allocate DMAable memory for page D0 INQUIRY buffer */
4534         pinstance->inq_data = dma_alloc_coherent(&pinstance->pdev->dev,
4535                                         sizeof(struct pmcraid_inquiry_data),
4536                                         &pinstance->inq_data_baddr, GFP_KERNEL);
4537         if (pinstance->inq_data == NULL) {
4538                 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
4539                 pmcraid_release_buffers(pinstance);
4540                 return -ENOMEM;
4541         }
4542
4543         /* allocate DMAable memory for set timestamp data buffer */
4544         pinstance->timestamp_data = dma_alloc_coherent(&pinstance->pdev->dev,
4545                                         sizeof(struct pmcraid_timestamp_data),
4546                                         &pinstance->timestamp_data_baddr,
4547                                         GFP_KERNEL);
4548         if (pinstance->timestamp_data == NULL) {
4549                 pmcraid_err("couldn't allocate DMA memory for \
4550                                 set time_stamp \n");
4551                 pmcraid_release_buffers(pinstance);
4552                 return -ENOMEM;
4553         }
4554
4555
4556         /* Initialize all the command blocks and add them to free pool. No
4557          * need to lock (free_pool_lock) as this is done in initialization
4558          * itself
4559          */
4560         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4561                 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
4562                 pmcraid_init_cmdblk(cmdp, i);
4563                 cmdp->drv_inst = pinstance;
4564                 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
4565         }
4566
4567         return 0;
4568 }
4569
4570 /**
4571  * pmcraid_reinit_buffers - resets various buffer pointers
4572  * @pinstance: pointer to adapter instance
4573  * Return value
4574  *      none
4575  */
4576 static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
4577 {
4578         int i;
4579         int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4580
4581         for (i = 0; i < pinstance->num_hrrq; i++) {
4582                 memset(pinstance->hrrq_start[i], 0, buffer_size);
4583                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4584                 pinstance->hrrq_end[i] =
4585                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4586                 pinstance->host_toggle_bit[i] = 1;
4587         }
4588 }
4589
4590 /**
4591  * pmcraid_init_instance - initialize per instance data structure
4592  * @pdev: pointer to pci device structure
4593  * @host: pointer to Scsi_Host structure
4594  * @mapped_pci_addr: memory mapped IOA configuration registers
4595  *
4596  * Return Value
4597  *       0 on success, non-zero in case of any failure
4598  */
4599 static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
4600                                  void __iomem *mapped_pci_addr)
4601 {
4602         struct pmcraid_instance *pinstance =
4603                 (struct pmcraid_instance *)host->hostdata;
4604
4605         pinstance->host = host;
4606         pinstance->pdev = pdev;
4607
4608         /* Initialize register addresses */
4609         pinstance->mapped_dma_addr = mapped_pci_addr;
4610
4611         /* Initialize chip-specific details */
4612         {
4613                 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
4614                 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
4615
4616                 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
4617
4618                 pint_regs->ioa_host_interrupt_reg =
4619                         mapped_pci_addr + chip_cfg->ioa_host_intr;
4620                 pint_regs->ioa_host_interrupt_clr_reg =
4621                         mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
4622                 pint_regs->ioa_host_msix_interrupt_reg =
4623                         mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
4624                 pint_regs->host_ioa_interrupt_reg =
4625                         mapped_pci_addr + chip_cfg->host_ioa_intr;
4626                 pint_regs->host_ioa_interrupt_clr_reg =
4627                         mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
4628
4629                 /* Current version of firmware exposes interrupt mask set
4630                  * and mask clr registers through memory mapped bar0.
4631                  */
4632                 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
4633                 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
4634                 pint_regs->ioa_host_interrupt_mask_reg =
4635                         mapped_pci_addr + chip_cfg->ioa_host_mask;
4636                 pint_regs->ioa_host_interrupt_mask_clr_reg =
4637                         mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
4638                 pint_regs->global_interrupt_mask_reg =
4639                         mapped_pci_addr + chip_cfg->global_intr_mask;
4640         }
4641
4642         pinstance->ioa_reset_attempts = 0;
4643         init_waitqueue_head(&pinstance->reset_wait_q);
4644
4645         atomic_set(&pinstance->outstanding_cmds, 0);
4646         atomic_set(&pinstance->last_message_id, 0);
4647         atomic_set(&pinstance->expose_resources, 0);
4648
4649         INIT_LIST_HEAD(&pinstance->free_res_q);
4650         INIT_LIST_HEAD(&pinstance->used_res_q);
4651         INIT_LIST_HEAD(&pinstance->free_cmd_pool);
4652         INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
4653
4654         spin_lock_init(&pinstance->free_pool_lock);
4655         spin_lock_init(&pinstance->pending_pool_lock);
4656         spin_lock_init(&pinstance->resource_lock);
4657         mutex_init(&pinstance->aen_queue_lock);
4658
4659         /* Work-queue (Shared) for deferred processing error handling */
4660         INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
4661
4662         /* Initialize the default log_level */
4663         pinstance->current_log_level = pmcraid_log_level;
4664
4665         /* Setup variables required for reset engine */
4666         pinstance->ioa_state = IOA_STATE_UNKNOWN;
4667         pinstance->reset_cmd = NULL;
4668         return 0;
4669 }
4670
4671 /**
4672  * pmcraid_shutdown - shutdown adapter controller.
4673  * @pdev: pci device struct
4674  *
4675  * Issues an adapter shutdown to the card waits for its completion
4676  *
4677  * Return value
4678  *        none
4679  */
4680 static void pmcraid_shutdown(struct pci_dev *pdev)
4681 {
4682         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4683         pmcraid_reset_bringdown(pinstance);
4684 }
4685
4686
4687 /*
4688  * pmcraid_get_minor - returns unused minor number from minor number bitmap
4689  */
4690 static unsigned short pmcraid_get_minor(void)
4691 {
4692         int minor;
4693
4694         minor = find_first_zero_bit(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
4695         __set_bit(minor, pmcraid_minor);
4696         return minor;
4697 }
4698
4699 /*
4700  * pmcraid_release_minor - releases given minor back to minor number bitmap
4701  */
4702 static void pmcraid_release_minor(unsigned short minor)
4703 {
4704         __clear_bit(minor, pmcraid_minor);
4705 }
4706
4707 /**
4708  * pmcraid_setup_chrdev - allocates a minor number and registers a char device
4709  *
4710  * @pinstance: pointer to adapter instance for which to register device
4711  *
4712  * Return value
4713  *      0 in case of success, otherwise non-zero
4714  */
4715 static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
4716 {
4717         int minor;
4718         int error;
4719
4720         minor = pmcraid_get_minor();
4721         cdev_init(&pinstance->cdev, &pmcraid_fops);
4722         pinstance->cdev.owner = THIS_MODULE;
4723
4724         error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
4725
4726         if (error)
4727                 pmcraid_release_minor(minor);
4728         else
4729                 device_create(&pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
4730                               NULL, "%s%u", PMCRAID_DEVFILE, minor);
4731         return error;
4732 }
4733
4734 /**
4735  * pmcraid_release_chrdev - unregisters per-adapter management interface
4736  *
4737  * @pinstance: pointer to adapter instance structure
4738  *
4739  * Return value
4740  *  none
4741  */
4742 static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
4743 {
4744         pmcraid_release_minor(MINOR(pinstance->cdev.dev));
4745         device_destroy(&pmcraid_class,
4746                        MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
4747         cdev_del(&pinstance->cdev);
4748 }
4749
4750 /**
4751  * pmcraid_remove - IOA hot plug remove entry point
4752  * @pdev: pci device struct
4753  *
4754  * Return value
4755  *        none
4756  */
4757 static void pmcraid_remove(struct pci_dev *pdev)
4758 {
4759         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4760
4761         /* remove the management interface (/dev file) for this device */
4762         pmcraid_release_chrdev(pinstance);
4763
4764         /* remove host template from scsi midlayer */
4765         scsi_remove_host(pinstance->host);
4766
4767         /* block requests from mid-layer */
4768         scsi_block_requests(pinstance->host);
4769
4770         /* initiate shutdown adapter */
4771         pmcraid_shutdown(pdev);
4772
4773         pmcraid_disable_interrupts(pinstance, ~0);
4774         flush_work(&pinstance->worker_q);
4775
4776         pmcraid_kill_tasklets(pinstance);
4777         pmcraid_unregister_interrupt_handler(pinstance);
4778         pmcraid_release_buffers(pinstance);
4779         iounmap(pinstance->mapped_dma_addr);
4780         pci_release_regions(pdev);
4781         scsi_host_put(pinstance->host);
4782         pci_disable_device(pdev);
4783
4784         return;
4785 }
4786
4787 /**
4788  * pmcraid_suspend - driver suspend entry point for power management
4789  * @dev:   Device structure
4790  *
4791  * Return Value - 0 always
4792  */
4793 static int __maybe_unused pmcraid_suspend(struct device *dev)
4794 {
4795         struct pci_dev *pdev = to_pci_dev(dev);
4796         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4797
4798         pmcraid_shutdown(pdev);
4799         pmcraid_disable_interrupts(pinstance, ~0);
4800         pmcraid_kill_tasklets(pinstance);
4801         pmcraid_unregister_interrupt_handler(pinstance);
4802
4803         return 0;
4804 }
4805
4806 /**
4807  * pmcraid_resume - driver resume entry point PCI power management
4808  * @dev: Device structure
4809  *
4810  * Return Value - 0 in case of success. Error code in case of any failure
4811  */
4812 static int __maybe_unused pmcraid_resume(struct device *dev)
4813 {
4814         struct pci_dev *pdev = to_pci_dev(dev);
4815         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4816         struct Scsi_Host *host = pinstance->host;
4817         int rc = 0;
4818
4819         if (sizeof(dma_addr_t) == 4 ||
4820             dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
4821                 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
4822
4823         if (rc == 0)
4824                 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
4825
4826         if (rc != 0) {
4827                 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
4828                 goto disable_device;
4829         }
4830
4831         pmcraid_disable_interrupts(pinstance, ~0);
4832         atomic_set(&pinstance->outstanding_cmds, 0);
4833         rc = pmcraid_register_interrupt_handler(pinstance);
4834
4835         if (rc) {
4836                 dev_err(&pdev->dev,
4837                         "resume: couldn't register interrupt handlers\n");
4838                 rc = -ENODEV;
4839                 goto release_host;
4840         }
4841
4842         pmcraid_init_tasklets(pinstance);
4843         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
4844
4845         /* Start with hard reset sequence which brings up IOA to operational
4846          * state as well as completes the reset sequence.
4847          */
4848         pinstance->ioa_hard_reset = 1;
4849
4850         /* Start IOA firmware initialization and bring card to Operational
4851          * state.
4852          */
4853         if (pmcraid_reset_bringup(pinstance)) {
4854                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
4855                 rc = -ENODEV;
4856                 goto release_tasklets;
4857         }
4858
4859         return 0;
4860
4861 release_tasklets:
4862         pmcraid_disable_interrupts(pinstance, ~0);
4863         pmcraid_kill_tasklets(pinstance);
4864         pmcraid_unregister_interrupt_handler(pinstance);
4865
4866 release_host:
4867         scsi_host_put(host);
4868
4869 disable_device:
4870
4871         return rc;
4872 }
4873
4874 /**
4875  * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
4876  *                              completion of the ioa reset
4877  * @cmd: pointer to reset command block
4878  */
4879 static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
4880 {
4881         struct pmcraid_instance *pinstance = cmd->drv_inst;
4882         unsigned long flags;
4883
4884         spin_lock_irqsave(pinstance->host->host_lock, flags);
4885         pmcraid_ioa_reset(cmd);
4886         spin_unlock_irqrestore(pinstance->host->host_lock, flags);
4887         scsi_unblock_requests(pinstance->host);
4888         schedule_work(&pinstance->worker_q);
4889 }
4890
4891 /**
4892  * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
4893  *
4894  * @cmd: pointer to pmcraid_cmd structure
4895  *
4896  * Return Value
4897  *  0 for success or non-zero for failure cases
4898  */
4899 static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
4900 {
4901         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
4902         void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
4903
4904         pmcraid_reinit_cmdblk(cmd);
4905
4906         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
4907         ioarcb->request_type = REQ_TYPE_IOACMD;
4908         ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
4909         ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
4910
4911         /* If this was called as part of resource table reinitialization due to
4912          * lost CCN, it is enough to return the command block back to free pool
4913          * as part of set_supported_devs completion function.
4914          */
4915         if (cmd->drv_inst->reinit_cfg_table) {
4916                 cmd->drv_inst->reinit_cfg_table = 0;
4917                 cmd->release = 1;
4918                 cmd_done = pmcraid_reinit_cfgtable_done;
4919         }
4920
4921         /* we will be done with the reset sequence after set supported devices,
4922          * setup the done function to return the command block back to free
4923          * pool
4924          */
4925         pmcraid_send_cmd(cmd,
4926                          cmd_done,
4927                          PMCRAID_SET_SUP_DEV_TIMEOUT,
4928                          pmcraid_timeout_handler);
4929         return;
4930 }
4931
4932 /**
4933  * pmcraid_set_timestamp - set the timestamp to IOAFP
4934  *
4935  * @cmd: pointer to pmcraid_cmd structure
4936  *
4937  * Return Value
4938  *  0 for success or non-zero for failure cases
4939  */
4940 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
4941 {
4942         struct pmcraid_instance *pinstance = cmd->drv_inst;
4943         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
4944         __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
4945         struct pmcraid_ioadl_desc *ioadl;
4946         u64 timestamp;
4947
4948         timestamp = ktime_get_real_seconds() * 1000;
4949
4950         pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
4951         pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
4952         pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
4953         pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
4954         pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
4955         pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
4956
4957         pmcraid_reinit_cmdblk(cmd);
4958         ioarcb->request_type = REQ_TYPE_SCSI;
4959         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
4960         ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
4961         ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
4962         memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
4963
4964         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
4965                                         offsetof(struct pmcraid_ioarcb,
4966                                                 add_data.u.ioadl[0]));
4967         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
4968         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
4969
4970         ioarcb->request_flags0 |= NO_LINK_DESCS;
4971         ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
4972         ioarcb->data_transfer_length =
4973                 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
4974         ioadl = &(ioarcb->add_data.u.ioadl[0]);
4975         ioadl->flags = IOADL_FLAGS_LAST_DESC;
4976         ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
4977         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
4978
4979         if (!pinstance->timestamp_error) {
4980                 pinstance->timestamp_error = 0;
4981                 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
4982                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
4983         } else {
4984                 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
4985                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
4986                 return;
4987         }
4988 }
4989
4990
4991 /**
4992  * pmcraid_init_res_table - Initialize the resource table
4993  * @cmd:  pointer to pmcraid command struct
4994  *
4995  * This function looks through the existing resource table, comparing
4996  * it with the config table. This function will take care of old/new
4997  * devices and schedule adding/removing them from the mid-layer
4998  * as appropriate.
4999  *
5000  * Return value
5001  *       None
5002  */
5003 static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5004 {
5005         struct pmcraid_instance *pinstance = cmd->drv_inst;
5006         struct pmcraid_resource_entry *res, *temp;
5007         struct pmcraid_config_table_entry *cfgte;
5008         unsigned long lock_flags;
5009         int found, rc, i;
5010         u16 fw_version;
5011         LIST_HEAD(old_res);
5012
5013         if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5014                 pmcraid_err("IOA requires microcode download\n");
5015
5016         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5017
5018         /* resource list is protected by pinstance->resource_lock.
5019          * init_res_table can be called from probe (user-thread) or runtime
5020          * reset (timer/tasklet)
5021          */
5022         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5023
5024         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5025                 list_move_tail(&res->queue, &old_res);
5026
5027         for (i = 0; i < le16_to_cpu(pinstance->cfg_table->num_entries); i++) {
5028                 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5029                                                 PMCRAID_FW_VERSION_1)
5030                         cfgte = &pinstance->cfg_table->entries[i];
5031                 else
5032                         cfgte = (struct pmcraid_config_table_entry *)
5033                                         &pinstance->cfg_table->entries_ext[i];
5034
5035                 if (!pmcraid_expose_resource(fw_version, cfgte))
5036                         continue;
5037
5038                 found = 0;
5039
5040                 /* If this entry was already detected and initialized */
5041                 list_for_each_entry_safe(res, temp, &old_res, queue) {
5042
5043                         rc = memcmp(&res->cfg_entry.resource_address,
5044                                     &cfgte->resource_address,
5045                                     sizeof(cfgte->resource_address));
5046                         if (!rc) {
5047                                 list_move_tail(&res->queue,
5048                                                 &pinstance->used_res_q);
5049                                 found = 1;
5050                                 break;
5051                         }
5052                 }
5053
5054                 /* If this is new entry, initialize it and add it the queue */
5055                 if (!found) {
5056
5057                         if (list_empty(&pinstance->free_res_q)) {
5058                                 pmcraid_err("Too many devices attached\n");
5059                                 break;
5060                         }
5061
5062                         found = 1;
5063                         res = list_entry(pinstance->free_res_q.next,
5064                                          struct pmcraid_resource_entry, queue);
5065
5066                         res->scsi_dev = NULL;
5067                         res->change_detected = RES_CHANGE_ADD;
5068                         res->reset_progress = 0;
5069                         list_move_tail(&res->queue, &pinstance->used_res_q);
5070                 }
5071
5072                 /* copy new configuration table entry details into driver
5073                  * maintained resource entry
5074                  */
5075                 if (found) {
5076                         memcpy(&res->cfg_entry, cfgte,
5077                                         pinstance->config_table_entry_size);
5078                         pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5079                                  res->cfg_entry.resource_type,
5080                                  (fw_version <= PMCRAID_FW_VERSION_1 ?
5081                                         res->cfg_entry.unique_flags1 :
5082                                         le16_to_cpu(res->cfg_entry.array_id) & 0xFF),
5083                                  le32_to_cpu(res->cfg_entry.resource_address));
5084                 }
5085         }
5086
5087         /* Detect any deleted entries, mark them for deletion from mid-layer */
5088         list_for_each_entry_safe(res, temp, &old_res, queue) {
5089
5090                 if (res->scsi_dev) {
5091                         res->change_detected = RES_CHANGE_DEL;
5092                         res->cfg_entry.resource_handle =
5093                                 PMCRAID_INVALID_RES_HANDLE;
5094                         list_move_tail(&res->queue, &pinstance->used_res_q);
5095                 } else {
5096                         list_move_tail(&res->queue, &pinstance->free_res_q);
5097                 }
5098         }
5099
5100         /* release the resource list lock */
5101         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5102         pmcraid_set_timestamp(cmd);
5103 }
5104
5105 /**
5106  * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5107  * @cmd: pointer pmcraid_cmd struct
5108  *
5109  * This function sends a Query IOA Configuration command to the adapter to
5110  * retrieve the IOA configuration table.
5111  *
5112  * Return value:
5113  *      none
5114  */
5115 static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5116 {
5117         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5118         struct pmcraid_ioadl_desc *ioadl;
5119         struct pmcraid_instance *pinstance = cmd->drv_inst;
5120         __be32 cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5121
5122         if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5123                                         PMCRAID_FW_VERSION_1)
5124                 pinstance->config_table_entry_size =
5125                         sizeof(struct pmcraid_config_table_entry);
5126         else
5127                 pinstance->config_table_entry_size =
5128                         sizeof(struct pmcraid_config_table_entry_ext);
5129
5130         ioarcb->request_type = REQ_TYPE_IOACMD;
5131         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5132
5133         ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5134
5135         /* firmware requires 4-byte length field, specified in B.E format */
5136         memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5137
5138         /* Since entire config table can be described by single IOADL, it can
5139          * be part of IOARCB itself
5140          */
5141         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5142                                         offsetof(struct pmcraid_ioarcb,
5143                                                 add_data.u.ioadl[0]));
5144         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5145         ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
5146
5147         ioarcb->request_flags0 |= NO_LINK_DESCS;
5148         ioarcb->data_transfer_length =
5149                 cpu_to_le32(sizeof(struct pmcraid_config_table));
5150
5151         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5152         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5153         ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5154         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5155
5156         pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5157                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5158 }
5159
5160
5161 /**
5162  * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5163  * @pdev: pointer to pci device structure
5164  * @dev_id: pointer to device ids structure
5165  *
5166  * Return Value
5167  *      returns 0 if the device is claimed and successfully configured.
5168  *      returns non-zero error code in case of any failure
5169  */
5170 static int pmcraid_probe(struct pci_dev *pdev,
5171                          const struct pci_device_id *dev_id)
5172 {
5173         struct pmcraid_instance *pinstance;
5174         struct Scsi_Host *host;
5175         void __iomem *mapped_pci_addr;
5176         int rc = PCIBIOS_SUCCESSFUL;
5177
5178         if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5179                 pmcraid_err
5180                         ("maximum number(%d) of supported adapters reached\n",
5181                          atomic_read(&pmcraid_adapter_count));
5182                 return -ENOMEM;
5183         }
5184
5185         atomic_inc(&pmcraid_adapter_count);
5186         rc = pci_enable_device(pdev);
5187
5188         if (rc) {
5189                 dev_err(&pdev->dev, "Cannot enable adapter\n");
5190                 atomic_dec(&pmcraid_adapter_count);
5191                 return rc;
5192         }
5193
5194         dev_info(&pdev->dev,
5195                 "Found new IOA(%x:%x), Total IOA count: %d\n",
5196                  pdev->vendor, pdev->device,
5197                  atomic_read(&pmcraid_adapter_count));
5198
5199         rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5200
5201         if (rc < 0) {
5202                 dev_err(&pdev->dev,
5203                         "Couldn't register memory range of registers\n");
5204                 goto out_disable_device;
5205         }
5206
5207         mapped_pci_addr = pci_iomap(pdev, 0, 0);
5208
5209         if (!mapped_pci_addr) {
5210                 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5211                 rc = -ENOMEM;
5212                 goto out_release_regions;
5213         }
5214
5215         pci_set_master(pdev);
5216
5217         /* Firmware requires the system bus address of IOARCB to be within
5218          * 32-bit addressable range though it has 64-bit IOARRIN register.
5219          * However, firmware supports 64-bit streaming DMA buffers, whereas
5220          * coherent buffers are to be 32-bit. Since dma_alloc_coherent always
5221          * returns memory within 4GB (if not, change this logic), coherent
5222          * buffers are within firmware acceptable address ranges.
5223          */
5224         if (sizeof(dma_addr_t) == 4 ||
5225             dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
5226                 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
5227
5228         /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5229          * bit mask for dma_alloc_coherent to return addresses within 4GB
5230          */
5231         if (rc == 0)
5232                 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
5233
5234         if (rc != 0) {
5235                 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5236                 goto cleanup_nomem;
5237         }
5238
5239         host = scsi_host_alloc(&pmcraid_host_template,
5240                                 sizeof(struct pmcraid_instance));
5241
5242         if (!host) {
5243                 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5244                 rc = -ENOMEM;
5245                 goto cleanup_nomem;
5246         }
5247
5248         host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5249         host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5250         host->unique_id = host->host_no;
5251         host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5252         host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5253
5254         /* zero out entire instance structure */
5255         pinstance = (struct pmcraid_instance *)host->hostdata;
5256         memset(pinstance, 0, sizeof(*pinstance));
5257
5258         pinstance->chip_cfg =
5259                 (struct pmcraid_chip_details *)(dev_id->driver_data);
5260
5261         rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5262
5263         if (rc < 0) {
5264                 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5265                 goto out_scsi_host_put;
5266         }
5267
5268         pci_set_drvdata(pdev, pinstance);
5269
5270         /* Save PCI config-space for use following the reset */
5271         rc = pci_save_state(pinstance->pdev);
5272
5273         if (rc != 0) {
5274                 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5275                 goto out_scsi_host_put;
5276         }
5277
5278         pmcraid_disable_interrupts(pinstance, ~0);
5279
5280         rc = pmcraid_register_interrupt_handler(pinstance);
5281
5282         if (rc) {
5283                 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5284                 goto out_scsi_host_put;
5285         }
5286
5287         pmcraid_init_tasklets(pinstance);
5288
5289         /* allocate verious buffers used by LLD.*/
5290         rc = pmcraid_init_buffers(pinstance);
5291
5292         if (rc) {
5293                 pmcraid_err("couldn't allocate memory blocks\n");
5294                 goto out_unregister_isr;
5295         }
5296
5297         /* check the reset type required */
5298         pmcraid_reset_type(pinstance);
5299
5300         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5301
5302         /* Start IOA firmware initialization and bring card to Operational
5303          * state.
5304          */
5305         pmcraid_info("starting IOA initialization sequence\n");
5306         if (pmcraid_reset_bringup(pinstance)) {
5307                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5308                 rc = 1;
5309                 goto out_release_bufs;
5310         }
5311
5312         /* Add adapter instance into mid-layer list */
5313         rc = scsi_add_host(pinstance->host, &pdev->dev);
5314         if (rc != 0) {
5315                 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
5316                 goto out_release_bufs;
5317         }
5318
5319         scsi_scan_host(pinstance->host);
5320
5321         rc = pmcraid_setup_chrdev(pinstance);
5322
5323         if (rc != 0) {
5324                 pmcraid_err("couldn't create mgmt interface, error: %x\n",
5325                              rc);
5326                 goto out_remove_host;
5327         }
5328
5329         /* Schedule worker thread to handle CCN and take care of adding and
5330          * removing devices to OS
5331          */
5332         atomic_set(&pinstance->expose_resources, 1);
5333         schedule_work(&pinstance->worker_q);
5334         return rc;
5335
5336 out_remove_host:
5337         scsi_remove_host(host);
5338
5339 out_release_bufs:
5340         pmcraid_release_buffers(pinstance);
5341
5342 out_unregister_isr:
5343         pmcraid_kill_tasklets(pinstance);
5344         pmcraid_unregister_interrupt_handler(pinstance);
5345
5346 out_scsi_host_put:
5347         scsi_host_put(host);
5348
5349 cleanup_nomem:
5350         iounmap(mapped_pci_addr);
5351
5352 out_release_regions:
5353         pci_release_regions(pdev);
5354
5355 out_disable_device:
5356         atomic_dec(&pmcraid_adapter_count);
5357         pci_disable_device(pdev);
5358         return -ENODEV;
5359 }
5360
5361 static SIMPLE_DEV_PM_OPS(pmcraid_pm_ops, pmcraid_suspend, pmcraid_resume);
5362
5363 /*
5364  * PCI driver structure of pmcraid driver
5365  */
5366 static struct pci_driver pmcraid_driver = {
5367         .name = PMCRAID_DRIVER_NAME,
5368         .id_table = pmcraid_pci_table,
5369         .probe = pmcraid_probe,
5370         .remove = pmcraid_remove,
5371         .driver.pm = &pmcraid_pm_ops,
5372         .shutdown = pmcraid_shutdown
5373 };
5374
5375 /**
5376  * pmcraid_init - module load entry point
5377  */
5378 static int __init pmcraid_init(void)
5379 {
5380         dev_t dev;
5381         int error;
5382
5383         pmcraid_info("%s Device Driver version: %s\n",
5384                          PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
5385
5386         error = alloc_chrdev_region(&dev, 0,
5387                                     PMCRAID_MAX_ADAPTERS,
5388                                     PMCRAID_DEVFILE);
5389
5390         if (error) {
5391                 pmcraid_err("failed to get a major number for adapters\n");
5392                 goto out_init;
5393         }
5394
5395         pmcraid_major = MAJOR(dev);
5396
5397         error = class_register(&pmcraid_class);
5398
5399         if (error) {
5400                 pmcraid_err("failed to register with sysfs, error = %x\n",
5401                             error);
5402                 goto out_unreg_chrdev;
5403         }
5404
5405         error = pmcraid_netlink_init();
5406
5407         if (error) {
5408                 class_unregister(&pmcraid_class);
5409                 goto out_unreg_chrdev;
5410         }
5411
5412         error = pci_register_driver(&pmcraid_driver);
5413
5414         if (error == 0)
5415                 goto out_init;
5416
5417         pmcraid_err("failed to register pmcraid driver, error = %x\n",
5418                      error);
5419         class_unregister(&pmcraid_class);
5420         pmcraid_netlink_release();
5421
5422 out_unreg_chrdev:
5423         unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
5424
5425 out_init:
5426         return error;
5427 }
5428
5429 /**
5430  * pmcraid_exit - module unload entry point
5431  */
5432 static void __exit pmcraid_exit(void)
5433 {
5434         pmcraid_netlink_release();
5435         unregister_chrdev_region(MKDEV(pmcraid_major, 0),
5436                                  PMCRAID_MAX_ADAPTERS);
5437         pci_unregister_driver(&pmcraid_driver);
5438         class_unregister(&pmcraid_class);
5439 }
5440
5441 module_init(pmcraid_init);
5442 module_exit(pmcraid_exit);