1/*
   2 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
   3 *
   4 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
   5 *             PMC-Sierra Inc
   6 *
   7 * Copyright (C) 2008, 2009 PMC Sierra Inc
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
  22 * USA
  23 *
  24 */
  25#include <linux/fs.h>
  26#include <linux/init.h>
  27#include <linux/types.h>
  28#include <linux/errno.h>
  29#include <linux/kernel.h>
  30#include <linux/ioport.h>
  31#include <linux/delay.h>
  32#include <linux/pci.h>
  33#include <linux/wait.h>
  34#include <linux/spinlock.h>
  35#include <linux/sched.h>
  36#include <linux/interrupt.h>
  37#include <linux/blkdev.h>
  38#include <linux/firmware.h>
  39#include <linux/module.h>
  40#include <linux/moduleparam.h>
  41#include <linux/hdreg.h>
  42#include <linux/io.h>
  43#include <linux/slab.h>
  44#include <asm/irq.h>
  45#include <asm/processor.h>
  46#include <linux/libata.h>
  47#include <linux/mutex.h>
  48#include <linux/ktime.h>
  49#include <scsi/scsi.h>
  50#include <scsi/scsi_host.h>
  51#include <scsi/scsi_device.h>
  52#include <scsi/scsi_tcq.h>
  53#include <scsi/scsi_eh.h>
  54#include <scsi/scsi_cmnd.h>
  55#include <scsi/scsicam.h>
  56
  57#include "pmcraid.h"
  58
  59/*
  60 *   Module configuration parameters
  61 */
  62static unsigned int pmcraid_debug_log;
  63static unsigned int pmcraid_disable_aen;
  64static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
  65static unsigned int pmcraid_enable_msix;
  66
  67/*
  68 * Data structures to support multiple adapters by the LLD.
  69 * pmcraid_adapter_count - count of configured adapters
  70 */
  71static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
  72
  73/*
  74 * Supporting user-level control interface through IOCTL commands.
  75 * pmcraid_major - major number to use
  76 * pmcraid_minor - minor number(s) to use
  77 */
  78static unsigned int pmcraid_major;
  79static struct class *pmcraid_class;
  80DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
  81
  82/*
  83 * Module parameters
  84 */
  85MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
  86MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
  87MODULE_LICENSE("GPL");
  88MODULE_VERSION(PMCRAID_DRIVER_VERSION);
  89
  90module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
  91MODULE_PARM_DESC(log_level,
  92		 "Enables firmware error code logging, default :1 high-severity"
  93		 " errors, 2: all errors including high-severity errors,"
  94		 " 0: disables logging");
  95
  96module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
  97MODULE_PARM_DESC(debug,
  98		 "Enable driver verbose message logging. Set 1 to enable."
  99		 "(default: 0)");
 100
 101module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
 102MODULE_PARM_DESC(disable_aen,
 103		 "Disable driver aen notifications to apps. Set 1 to disable."
 104		 "(default: 0)");
 105
 106/* chip specific constants for PMC MaxRAID controllers (same for
 107 * 0x5220 and 0x8010
 108 */
 109static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
 110	{
 111	 .ioastatus = 0x0,
 112	 .ioarrin = 0x00040,
 113	 .mailbox = 0x7FC30,
 114	 .global_intr_mask = 0x00034,
 115	 .ioa_host_intr = 0x0009C,
 116	 .ioa_host_intr_clr = 0x000A0,
 117	 .ioa_host_msix_intr = 0x7FC40,
 118	 .ioa_host_mask = 0x7FC28,
 119	 .ioa_host_mask_clr = 0x7FC28,
 120	 .host_ioa_intr = 0x00020,
 121	 .host_ioa_intr_clr = 0x00020,
 122	 .transop_timeout = 300
 123	 }
 124};
 125
 126/*
 127 * PCI device ids supported by pmcraid driver
 128 */
 129static struct pci_device_id pmcraid_pci_table[] = {
 130	{ PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
 131	  0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
 132	},
 133	{}
 134};
 135
 136MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
 137
 138
 139
 140/**
 141 * pmcraid_slave_alloc - Prepare for commands to a device
 142 * @scsi_dev: scsi device struct
 143 *
 144 * This function is called by mid-layer prior to sending any command to the new
 145 * device. Stores resource entry details of the device in scsi_device struct.
 146 * Queuecommand uses the resource handle and other details to fill up IOARCB
 147 * while sending commands to the device.
 148 *
 149 * Return value:
 150 *	  0 on success / -ENXIO if device does not exist
 151 */
 152static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
 153{
 154	struct pmcraid_resource_entry *temp, *res = NULL;
 155	struct pmcraid_instance *pinstance;
 156	u8 target, bus, lun;
 157	unsigned long lock_flags;
 158	int rc = -ENXIO;
 159	u16 fw_version;
 160
 161	pinstance = shost_priv(scsi_dev->host);
 162
 163	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
 164
 165	/* Driver exposes VSET and GSCSI resources only; all other device types
 166	 * are not exposed. Resource list is synchronized using resource lock
 167	 * so any traversal or modifications to the list should be done inside
 168	 * this lock
 169	 */
 170	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
 171	list_for_each_entry(temp, &pinstance->used_res_q, queue) {
 172
 173		/* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
 174		if (RES_IS_VSET(temp->cfg_entry)) {
 175			if (fw_version <= PMCRAID_FW_VERSION_1)
 176				target = temp->cfg_entry.unique_flags1;
 177			else
 178				target = temp->cfg_entry.array_id & 0xFF;
 179
 180			if (target > PMCRAID_MAX_VSET_TARGETS)
 181				continue;
 182			bus = PMCRAID_VSET_BUS_ID;
 183			lun = 0;
 184		} else if (RES_IS_GSCSI(temp->cfg_entry)) {
 185			target = RES_TARGET(temp->cfg_entry.resource_address);
 186			bus = PMCRAID_PHYS_BUS_ID;
 187			lun = RES_LUN(temp->cfg_entry.resource_address);
 188		} else {
 189			continue;
 190		}
 191
 192		if (bus == scsi_dev->channel &&
 193		    target == scsi_dev->id &&
 194		    lun == scsi_dev->lun) {
 195			res = temp;
 196			break;
 197		}
 198	}
 199
 200	if (res) {
 201		res->scsi_dev = scsi_dev;
 202		scsi_dev->hostdata = res;
 203		res->change_detected = 0;
 204		atomic_set(&res->read_failures, 0);
 205		atomic_set(&res->write_failures, 0);
 206		rc = 0;
 207	}
 208	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
 209	return rc;
 210}
 211
 212/**
 213 * pmcraid_slave_configure - Configures a SCSI device
 214 * @scsi_dev: scsi device struct
 215 *
 216 * This function is executed by SCSI mid layer just after a device is first
 217 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
 218 * timeout value (default 30s) will be over-written to a higher value (60s)
 219 * and max_sectors value will be over-written to 512. It also sets queue depth
 220 * to host->cmd_per_lun value
 221 *
 222 * Return value:
 223 *	  0 on success
 224 */
 225static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
 226{
 227	struct pmcraid_resource_entry *res = scsi_dev->hostdata;
 228
 229	if (!res)
 230		return 0;
 231
 232	/* LLD exposes VSETs and Enclosure devices only */
 233	if (RES_IS_GSCSI(res->cfg_entry) &&
 234	    scsi_dev->type != TYPE_ENCLOSURE)
 235		return -ENXIO;
 236
 237	pmcraid_info("configuring %x:%x:%x:%x\n",
 238		     scsi_dev->host->unique_id,
 239		     scsi_dev->channel,
 240		     scsi_dev->id,
 241		     (u8)scsi_dev->lun);
 242
 243	if (RES_IS_GSCSI(res->cfg_entry)) {
 244		scsi_dev->allow_restart = 1;
 245	} else if (RES_IS_VSET(res->cfg_entry)) {
 246		scsi_dev->allow_restart = 1;
 247		blk_queue_rq_timeout(scsi_dev->request_queue,
 248				     PMCRAID_VSET_IO_TIMEOUT);
 249		blk_queue_max_hw_sectors(scsi_dev->request_queue,
 250				      PMCRAID_VSET_MAX_SECTORS);
 251	}
 252
 253	/*
 254	 * We never want to report TCQ support for these types of devices.
 255	 */
 256	if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
 257		scsi_dev->tagged_supported = 0;
 
 
 
 
 258
 259	return 0;
 260}
 261
 262/**
 263 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
 264 *
 265 * @scsi_dev: scsi device struct
 266 *
 267 * This is called by mid-layer before removing a device. Pointer assignments
 268 * done in pmcraid_slave_alloc will be reset to NULL here.
 269 *
 270 * Return value
 271 *   none
 272 */
 273static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
 274{
 275	struct pmcraid_resource_entry *res;
 276
 277	res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
 278
 279	if (res)
 280		res->scsi_dev = NULL;
 281
 282	scsi_dev->hostdata = NULL;
 283}
 284
 285/**
 286 * pmcraid_change_queue_depth - Change the device's queue depth
 287 * @scsi_dev: scsi device struct
 288 * @depth: depth to set
 
 289 *
 290 * Return value
 291 *	actual depth set
 292 */
 293static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
 
 294{
 
 
 
 295	if (depth > PMCRAID_MAX_CMD_PER_LUN)
 296		depth = PMCRAID_MAX_CMD_PER_LUN;
 297	return scsi_change_queue_depth(scsi_dev, depth);
 
 
 
 298}
 299
 300/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 301 * pmcraid_init_cmdblk - initializes a command block
 302 *
 303 * @cmd: pointer to struct pmcraid_cmd to be initialized
 304 * @index: if >=0 first time initialization; otherwise reinitialization
 305 *
 306 * Return Value
 307 *	 None
 308 */
 309void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
 310{
 311	struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
 312	dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
 313
 314	if (index >= 0) {
 315		/* first time initialization (called from  probe) */
 316		u32 ioasa_offset =
 317			offsetof(struct pmcraid_control_block, ioasa);
 318
 319		cmd->index = index;
 320		ioarcb->response_handle = cpu_to_le32(index << 2);
 321		ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
 322		ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
 323		ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
 324	} else {
 325		/* re-initialization of various lengths, called once command is
 326		 * processed by IOA
 327		 */
 328		memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
 329		ioarcb->hrrq_id = 0;
 330		ioarcb->request_flags0 = 0;
 331		ioarcb->request_flags1 = 0;
 332		ioarcb->cmd_timeout = 0;
 333		ioarcb->ioarcb_bus_addr &= (~0x1FULL);
 334		ioarcb->ioadl_bus_addr = 0;
 335		ioarcb->ioadl_length = 0;
 336		ioarcb->data_transfer_length = 0;
 337		ioarcb->add_cmd_param_length = 0;
 338		ioarcb->add_cmd_param_offset = 0;
 339		cmd->ioa_cb->ioasa.ioasc = 0;
 340		cmd->ioa_cb->ioasa.residual_data_length = 0;
 341		cmd->time_left = 0;
 342	}
 343
 344	cmd->cmd_done = NULL;
 345	cmd->scsi_cmd = NULL;
 346	cmd->release = 0;
 347	cmd->completion_req = 0;
 348	cmd->sense_buffer = 0;
 349	cmd->sense_buffer_dma = 0;
 350	cmd->dma_handle = 0;
 351	init_timer(&cmd->timer);
 352}
 353
 354/**
 355 * pmcraid_reinit_cmdblk - reinitialize a command block
 356 *
 357 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
 358 *
 359 * Return Value
 360 *	 None
 361 */
 362static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
 363{
 364	pmcraid_init_cmdblk(cmd, -1);
 365}
 366
 367/**
 368 * pmcraid_get_free_cmd - get a free cmd block from command block pool
 369 * @pinstance: adapter instance structure
 370 *
 371 * Return Value:
 372 *	returns pointer to cmd block or NULL if no blocks are available
 373 */
 374static struct pmcraid_cmd *pmcraid_get_free_cmd(
 375	struct pmcraid_instance *pinstance
 376)
 377{
 378	struct pmcraid_cmd *cmd = NULL;
 379	unsigned long lock_flags;
 380
 381	/* free cmd block list is protected by free_pool_lock */
 382	spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
 383
 384	if (!list_empty(&pinstance->free_cmd_pool)) {
 385		cmd = list_entry(pinstance->free_cmd_pool.next,
 386				 struct pmcraid_cmd, free_list);
 387		list_del(&cmd->free_list);
 388	}
 389	spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
 390
 391	/* Initialize the command block before giving it the caller */
 392	if (cmd != NULL)
 393		pmcraid_reinit_cmdblk(cmd);
 394	return cmd;
 395}
 396
 397/**
 398 * pmcraid_return_cmd - return a completed command block back into free pool
 399 * @cmd: pointer to the command block
 400 *
 401 * Return Value:
 402 *	nothing
 403 */
 404void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
 405{
 406	struct pmcraid_instance *pinstance = cmd->drv_inst;
 407	unsigned long lock_flags;
 408
 409	spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
 410	list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
 411	spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
 412}
 413
 414/**
 415 * pmcraid_read_interrupts -  reads IOA interrupts
 416 *
 417 * @pinstance: pointer to adapter instance structure
 418 *
 419 * Return value
 420 *	 interrupts read from IOA
 421 */
 422static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
 423{
 424	return (pinstance->interrupt_mode) ?
 425		ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
 426		ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 427}
 428
 429/**
 430 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
 431 *
 432 * @pinstance: pointer to per adapter instance structure
 433 * @intrs: interrupts to disable
 434 *
 435 * Return Value
 436 *	 None
 437 */
 438static void pmcraid_disable_interrupts(
 439	struct pmcraid_instance *pinstance,
 440	u32 intrs
 441)
 442{
 443	u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 444	u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
 445
 446	iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
 447	iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
 448	ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 449
 450	if (!pinstance->interrupt_mode) {
 451		iowrite32(intrs,
 452			pinstance->int_regs.ioa_host_interrupt_mask_reg);
 453		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 454	}
 455}
 456
 457/**
 458 * pmcraid_enable_interrupts - Enables specified interrupts
 459 *
 460 * @pinstance: pointer to per adapter instance structure
 461 * @intr: interrupts to enable
 462 *
 463 * Return Value
 464 *	 None
 465 */
 466static void pmcraid_enable_interrupts(
 467	struct pmcraid_instance *pinstance,
 468	u32 intrs
 469)
 470{
 471	u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
 472	u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
 473
 474	iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
 475
 476	if (!pinstance->interrupt_mode) {
 477		iowrite32(~intrs,
 478			 pinstance->int_regs.ioa_host_interrupt_mask_reg);
 479		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 480	}
 481
 482	pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
 483		ioread32(pinstance->int_regs.global_interrupt_mask_reg),
 484		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
 485}
 486
 487/**
 488 * pmcraid_clr_trans_op - clear trans to op interrupt
 489 *
 490 * @pinstance: pointer to per adapter instance structure
 491 *
 492 * Return Value
 493 *	 None
 494 */
 495static void pmcraid_clr_trans_op(
 496	struct pmcraid_instance *pinstance
 497)
 498{
 499	unsigned long lock_flags;
 500
 501	if (!pinstance->interrupt_mode) {
 502		iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
 503			pinstance->int_regs.ioa_host_interrupt_mask_reg);
 504		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 505		iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
 506			pinstance->int_regs.ioa_host_interrupt_clr_reg);
 507		ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
 508	}
 509
 510	if (pinstance->reset_cmd != NULL) {
 511		del_timer(&pinstance->reset_cmd->timer);
 512		spin_lock_irqsave(
 513			pinstance->host->host_lock, lock_flags);
 514		pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
 515		spin_unlock_irqrestore(
 516			pinstance->host->host_lock, lock_flags);
 517	}
 518}
 519
 520/**
 521 * pmcraid_reset_type - Determine the required reset type
 522 * @pinstance: pointer to adapter instance structure
 523 *
 524 * IOA requires hard reset if any of the following conditions is true.
 525 * 1. If HRRQ valid interrupt is not masked
 526 * 2. IOA reset alert doorbell is set
 527 * 3. If there are any error interrupts
 528 */
 529static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
 530{
 531	u32 mask;
 532	u32 intrs;
 533	u32 alerts;
 534
 535	mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
 536	intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 537	alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 538
 539	if ((mask & INTRS_HRRQ_VALID) == 0 ||
 540	    (alerts & DOORBELL_IOA_RESET_ALERT) ||
 541	    (intrs & PMCRAID_ERROR_INTERRUPTS)) {
 542		pmcraid_info("IOA requires hard reset\n");
 543		pinstance->ioa_hard_reset = 1;
 544	}
 545
 546	/* If unit check is active, trigger the dump */
 547	if (intrs & INTRS_IOA_UNIT_CHECK)
 548		pinstance->ioa_unit_check = 1;
 549}
 550
 551/**
 552 * pmcraid_bist_done - completion function for PCI BIST
 553 * @cmd: pointer to reset command
 554 * Return Value
 555 *	none
 556 */
 557
 558static void pmcraid_ioa_reset(struct pmcraid_cmd *);
 559
 560static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
 561{
 562	struct pmcraid_instance *pinstance = cmd->drv_inst;
 563	unsigned long lock_flags;
 564	int rc;
 565	u16 pci_reg;
 566
 567	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 568
 569	/* If PCI config space can't be accessed wait for another two secs */
 570	if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
 571	    cmd->time_left > 0) {
 572		pmcraid_info("BIST not complete, waiting another 2 secs\n");
 573		cmd->timer.expires = jiffies + cmd->time_left;
 574		cmd->time_left = 0;
 575		cmd->timer.data = (unsigned long)cmd;
 576		cmd->timer.function =
 577			(void (*)(unsigned long))pmcraid_bist_done;
 578		add_timer(&cmd->timer);
 579	} else {
 580		cmd->time_left = 0;
 581		pmcraid_info("BIST is complete, proceeding with reset\n");
 582		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 583		pmcraid_ioa_reset(cmd);
 584		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 585	}
 586}
 587
 588/**
 589 * pmcraid_start_bist - starts BIST
 590 * @cmd: pointer to reset cmd
 591 * Return Value
 592 *   none
 593 */
 594static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
 595{
 596	struct pmcraid_instance *pinstance = cmd->drv_inst;
 597	u32 doorbells, intrs;
 598
 599	/* proceed with bist and wait for 2 seconds */
 600	iowrite32(DOORBELL_IOA_START_BIST,
 601		pinstance->int_regs.host_ioa_interrupt_reg);
 602	doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 603	intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
 604	pmcraid_info("doorbells after start bist: %x intrs: %x\n",
 605		      doorbells, intrs);
 606
 607	cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
 608	cmd->timer.data = (unsigned long)cmd;
 609	cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
 610	cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
 611	add_timer(&cmd->timer);
 612}
 613
 614/**
 615 * pmcraid_reset_alert_done - completion routine for reset_alert
 616 * @cmd: pointer to command block used in reset sequence
 617 * Return value
 618 *  None
 619 */
 620static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
 621{
 622	struct pmcraid_instance *pinstance = cmd->drv_inst;
 623	u32 status = ioread32(pinstance->ioa_status);
 624	unsigned long lock_flags;
 625
 626	/* if the critical operation in progress bit is set or the wait times
 627	 * out, invoke reset engine to proceed with hard reset. If there is
 628	 * some more time to wait, restart the timer
 629	 */
 630	if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
 631	    cmd->time_left <= 0) {
 632		pmcraid_info("critical op is reset proceeding with reset\n");
 633		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 634		pmcraid_ioa_reset(cmd);
 635		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 636	} else {
 637		pmcraid_info("critical op is not yet reset waiting again\n");
 638		/* restart timer if some more time is available to wait */
 639		cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
 640		cmd->timer.data = (unsigned long)cmd;
 641		cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
 642		cmd->timer.function =
 643			(void (*)(unsigned long))pmcraid_reset_alert_done;
 644		add_timer(&cmd->timer);
 645	}
 646}
 647
 648/**
 649 * pmcraid_reset_alert - alerts IOA for a possible reset
 650 * @cmd : command block to be used for reset sequence.
 651 *
 652 * Return Value
 653 *	returns 0 if pci config-space is accessible and RESET_DOORBELL is
 654 *	successfully written to IOA. Returns non-zero in case pci_config_space
 655 *	is not accessible
 656 */
 657static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
 658static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
 659{
 660	struct pmcraid_instance *pinstance = cmd->drv_inst;
 661	u32 doorbells;
 662	int rc;
 663	u16 pci_reg;
 664
 665	/* If we are able to access IOA PCI config space, alert IOA that we are
 666	 * going to reset it soon. This enables IOA to preserv persistent error
 667	 * data if any. In case memory space is not accessible, proceed with
 668	 * BIST or slot_reset
 669	 */
 670	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
 671	if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
 672
 673		/* wait for IOA permission i.e until CRITICAL_OPERATION bit is
 674		 * reset IOA doesn't generate any interrupts when CRITICAL
 675		 * OPERATION bit is reset. A timer is started to wait for this
 676		 * bit to be reset.
 677		 */
 678		cmd->time_left = PMCRAID_RESET_TIMEOUT;
 679		cmd->timer.data = (unsigned long)cmd;
 680		cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
 681		cmd->timer.function =
 682			(void (*)(unsigned long))pmcraid_reset_alert_done;
 683		add_timer(&cmd->timer);
 684
 685		iowrite32(DOORBELL_IOA_RESET_ALERT,
 686			pinstance->int_regs.host_ioa_interrupt_reg);
 687		doorbells =
 688			ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
 689		pmcraid_info("doorbells after reset alert: %x\n", doorbells);
 690	} else {
 691		pmcraid_info("PCI config is not accessible starting BIST\n");
 692		pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
 693		pmcraid_start_bist(cmd);
 694	}
 695}
 696
 697/**
 698 * pmcraid_timeout_handler -  Timeout handler for internally generated ops
 699 *
 700 * @cmd : pointer to command structure, that got timedout
 701 *
 702 * This function blocks host requests and initiates an adapter reset.
 703 *
 704 * Return value:
 705 *   None
 706 */
 707static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
 708{
 709	struct pmcraid_instance *pinstance = cmd->drv_inst;
 710	unsigned long lock_flags;
 711
 712	dev_info(&pinstance->pdev->dev,
 713		"Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
 714		cmd->ioa_cb->ioarcb.cdb[0]);
 715
 716	/* Command timeouts result in hard reset sequence. The command that got
 717	 * timed out may be the one used as part of reset sequence. In this
 718	 * case restart reset sequence using the same command block even if
 719	 * reset is in progress. Otherwise fail this command and get a free
 720	 * command block to restart the reset sequence.
 721	 */
 722	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 723	if (!pinstance->ioa_reset_in_progress) {
 724		pinstance->ioa_reset_attempts = 0;
 725		cmd = pmcraid_get_free_cmd(pinstance);
 726
 727		/* If we are out of command blocks, just return here itself.
 728		 * Some other command's timeout handler can do the reset job
 729		 */
 730		if (cmd == NULL) {
 731			spin_unlock_irqrestore(pinstance->host->host_lock,
 732					       lock_flags);
 733			pmcraid_err("no free cmnd block for timeout handler\n");
 734			return;
 735		}
 736
 737		pinstance->reset_cmd = cmd;
 738		pinstance->ioa_reset_in_progress = 1;
 739	} else {
 740		pmcraid_info("reset is already in progress\n");
 741
 742		if (pinstance->reset_cmd != cmd) {
 743			/* This command should have been given to IOA, this
 744			 * command will be completed by fail_outstanding_cmds
 745			 * anyway
 746			 */
 747			pmcraid_err("cmd is pending but reset in progress\n");
 748		}
 749
 750		/* If this command was being used as part of the reset
 751		 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
 752		 * causes fail_outstanding_commands not to return the command
 753		 * block back to free pool
 754		 */
 755		if (cmd == pinstance->reset_cmd)
 756			cmd->cmd_done = pmcraid_ioa_reset;
 757	}
 758
 759	/* Notify apps of important IOA bringup/bringdown sequences */
 760	if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
 761	    pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
 762		pmcraid_notify_ioastate(pinstance,
 763					PMC_DEVICE_EVENT_RESET_START);
 764
 765	pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
 766	scsi_block_requests(pinstance->host);
 767	pmcraid_reset_alert(cmd);
 768	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 769}
 770
 771/**
 772 * pmcraid_internal_done - completion routine for internally generated cmds
 773 *
 774 * @cmd: command that got response from IOA
 775 *
 776 * Return Value:
 777 *	 none
 778 */
 779static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
 780{
 781	pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
 782		     cmd->ioa_cb->ioarcb.cdb[0],
 783		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 784
 785	/* Some of the internal commands are sent with callers blocking for the
 786	 * response. Same will be indicated as part of cmd->completion_req
 787	 * field. Response path needs to wake up any waiters waiting for cmd
 788	 * completion if this flag is set.
 789	 */
 790	if (cmd->completion_req) {
 791		cmd->completion_req = 0;
 792		complete(&cmd->wait_for_completion);
 793	}
 794
 795	/* most of the internal commands are completed by caller itself, so
 796	 * no need to return the command block back to free pool until we are
 797	 * required to do so (e.g once done with initialization).
 798	 */
 799	if (cmd->release) {
 800		cmd->release = 0;
 801		pmcraid_return_cmd(cmd);
 802	}
 803}
 804
 805/**
 806 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
 807 *
 808 * @cmd: command that got response from IOA
 809 *
 810 * This routine is called after driver re-reads configuration table due to a
 811 * lost CCN. It returns the command block back to free pool and schedules
 812 * worker thread to add/delete devices into the system.
 813 *
 814 * Return Value:
 815 *	 none
 816 */
 817static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
 818{
 819	pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
 820		     cmd->ioa_cb->ioarcb.cdb[0],
 821		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 822
 823	if (cmd->release) {
 824		cmd->release = 0;
 825		pmcraid_return_cmd(cmd);
 826	}
 827	pmcraid_info("scheduling worker for config table reinitialization\n");
 828	schedule_work(&cmd->drv_inst->worker_q);
 829}
 830
 831/**
 832 * pmcraid_erp_done - Process completion of SCSI error response from device
 833 * @cmd: pmcraid_command
 834 *
 835 * This function copies the sense buffer into the scsi_cmd struct and completes
 836 * scsi_cmd by calling scsi_done function.
 837 *
 838 * Return value:
 839 *  none
 840 */
 841static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
 842{
 843	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
 844	struct pmcraid_instance *pinstance = cmd->drv_inst;
 845	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
 846
 847	if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
 848		scsi_cmd->result |= (DID_ERROR << 16);
 849		scmd_printk(KERN_INFO, scsi_cmd,
 850			    "command CDB[0] = %x failed with IOASC: 0x%08X\n",
 851			    cmd->ioa_cb->ioarcb.cdb[0], ioasc);
 852	}
 853
 854	/* if we had allocated sense buffers for request sense, copy the sense
 855	 * release the buffers
 856	 */
 857	if (cmd->sense_buffer != NULL) {
 858		memcpy(scsi_cmd->sense_buffer,
 859		       cmd->sense_buffer,
 860		       SCSI_SENSE_BUFFERSIZE);
 861		pci_free_consistent(pinstance->pdev,
 862				    SCSI_SENSE_BUFFERSIZE,
 863				    cmd->sense_buffer, cmd->sense_buffer_dma);
 864		cmd->sense_buffer = NULL;
 865		cmd->sense_buffer_dma = 0;
 866	}
 867
 868	scsi_dma_unmap(scsi_cmd);
 869	pmcraid_return_cmd(cmd);
 870	scsi_cmd->scsi_done(scsi_cmd);
 871}
 872
 873/**
 874 * pmcraid_fire_command - sends an IOA command to adapter
 875 *
 876 * This function adds the given block into pending command list
 877 * and returns without waiting
 878 *
 879 * @cmd : command to be sent to the device
 880 *
 881 * Return Value
 882 *	None
 883 */
 884static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
 885{
 886	struct pmcraid_instance *pinstance = cmd->drv_inst;
 887	unsigned long lock_flags;
 888
 889	/* Add this command block to pending cmd pool. We do this prior to
 890	 * writting IOARCB to ioarrin because IOA might complete the command
 891	 * by the time we are about to add it to the list. Response handler
 892	 * (isr/tasklet) looks for cmd block in the pending pending list.
 893	 */
 894	spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
 895	list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
 896	spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
 897	atomic_inc(&pinstance->outstanding_cmds);
 898
 899	/* driver writes lower 32-bit value of IOARCB address only */
 900	mb();
 901	iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
 902		  pinstance->ioarrin);
 903}
 904
 905/**
 906 * pmcraid_send_cmd - fires a command to IOA
 907 *
 908 * This function also sets up timeout function, and command completion
 909 * function
 910 *
 911 * @cmd: pointer to the command block to be fired to IOA
 912 * @cmd_done: command completion function, called once IOA responds
 913 * @timeout: timeout to wait for this command completion
 914 * @timeout_func: timeout handler
 915 *
 916 * Return value
 917 *   none
 918 */
 919static void pmcraid_send_cmd(
 920	struct pmcraid_cmd *cmd,
 921	void (*cmd_done) (struct pmcraid_cmd *),
 922	unsigned long timeout,
 923	void (*timeout_func) (struct pmcraid_cmd *)
 924)
 925{
 926	/* initialize done function */
 927	cmd->cmd_done = cmd_done;
 928
 929	if (timeout_func) {
 930		/* setup timeout handler */
 931		cmd->timer.data = (unsigned long)cmd;
 932		cmd->timer.expires = jiffies + timeout;
 933		cmd->timer.function = (void (*)(unsigned long))timeout_func;
 934		add_timer(&cmd->timer);
 935	}
 936
 937	/* fire the command to IOA */
 938	_pmcraid_fire_command(cmd);
 939}
 940
 941/**
 942 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
 943 * @cmd: pointer to the command block used for sending IOA shutdown command
 944 *
 945 * Return value
 946 *  None
 947 */
 948static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
 949{
 950	struct pmcraid_instance *pinstance = cmd->drv_inst;
 951	unsigned long lock_flags;
 952
 953	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
 954	pmcraid_ioa_reset(cmd);
 955	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
 956}
 957
 958/**
 959 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
 960 *
 961 * @cmd: pointer to the command block used as part of reset sequence
 962 *
 963 * Return Value
 964 *  None
 965 */
 966static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
 967{
 968	pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
 969		     cmd->ioa_cb->ioarcb.cdb[0],
 970		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
 971
 972	/* Note that commands sent during reset require next command to be sent
 973	 * to IOA. Hence reinit the done function as well as timeout function
 974	 */
 975	pmcraid_reinit_cmdblk(cmd);
 976	cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
 977	cmd->ioa_cb->ioarcb.resource_handle =
 978		cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
 979	cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
 980	cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
 981
 982	/* fire shutdown command to hardware. */
 983	pmcraid_info("firing normal shutdown command (%d) to IOA\n",
 984		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
 985
 986	pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
 987
 988	pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
 989			 PMCRAID_SHUTDOWN_TIMEOUT,
 990			 pmcraid_timeout_handler);
 991}
 992
 993/**
 994 * pmcraid_get_fwversion_done - completion function for get_fwversion
 995 *
 996 * @cmd: pointer to command block used to send INQUIRY command
 997 *
 998 * Return Value
 999 *	none
1000 */
1001static void pmcraid_querycfg(struct pmcraid_cmd *);
1002
1003static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1004{
1005	struct pmcraid_instance *pinstance = cmd->drv_inst;
1006	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1007	unsigned long lock_flags;
1008
1009	/* configuration table entry size depends on firmware version. If fw
1010	 * version is not known, it is not possible to interpret IOA config
1011	 * table
1012	 */
1013	if (ioasc) {
1014		pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1015		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1016		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1017		pmcraid_reset_alert(cmd);
1018		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1019	} else  {
1020		pmcraid_querycfg(cmd);
1021	}
1022}
1023
1024/**
1025 * pmcraid_get_fwversion - reads firmware version information
1026 *
1027 * @cmd: pointer to command block used to send INQUIRY command
1028 *
1029 * Return Value
1030 *	none
1031 */
1032static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1033{
1034	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1035	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1036	struct pmcraid_instance *pinstance = cmd->drv_inst;
1037	u16 data_size = sizeof(struct pmcraid_inquiry_data);
1038
1039	pmcraid_reinit_cmdblk(cmd);
1040	ioarcb->request_type = REQ_TYPE_SCSI;
1041	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1042	ioarcb->cdb[0] = INQUIRY;
1043	ioarcb->cdb[1] = 1;
1044	ioarcb->cdb[2] = 0xD0;
1045	ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1046	ioarcb->cdb[4] = data_size & 0xFF;
1047
1048	/* Since entire inquiry data it can be part of IOARCB itself
1049	 */
1050	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1051					offsetof(struct pmcraid_ioarcb,
1052						add_data.u.ioadl[0]));
1053	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1054	ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1055
1056	ioarcb->request_flags0 |= NO_LINK_DESCS;
1057	ioarcb->data_transfer_length = cpu_to_le32(data_size);
1058	ioadl = &(ioarcb->add_data.u.ioadl[0]);
1059	ioadl->flags = IOADL_FLAGS_LAST_DESC;
1060	ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1061	ioadl->data_len = cpu_to_le32(data_size);
1062
1063	pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1064			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1065}
1066
1067/**
1068 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1069 * @cmd: pointer to command block to be used for identify hrrq
1070 *
1071 * Return Value
1072 *	 none
1073 */
1074static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1075{
1076	struct pmcraid_instance *pinstance = cmd->drv_inst;
1077	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1078	int index = cmd->hrrq_index;
1079	__be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1080	u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1081	void (*done_function)(struct pmcraid_cmd *);
1082
1083	pmcraid_reinit_cmdblk(cmd);
1084	cmd->hrrq_index = index + 1;
1085
1086	if (cmd->hrrq_index < pinstance->num_hrrq) {
1087		done_function = pmcraid_identify_hrrq;
1088	} else {
1089		cmd->hrrq_index = 0;
1090		done_function = pmcraid_get_fwversion;
1091	}
1092
1093	/* Initialize ioarcb */
1094	ioarcb->request_type = REQ_TYPE_IOACMD;
1095	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1096
1097	/* initialize the hrrq number where IOA will respond to this command */
1098	ioarcb->hrrq_id = index;
1099	ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1100	ioarcb->cdb[1] = index;
1101
1102	/* IOA expects 64-bit pci address to be written in B.E format
1103	 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1104	 */
1105	pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1106		     hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1107
1108	memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1109	memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1110
1111	/* Subsequent commands require HRRQ identification to be successful.
1112	 * Note that this gets called even during reset from SCSI mid-layer
1113	 * or tasklet
1114	 */
1115	pmcraid_send_cmd(cmd, done_function,
1116			 PMCRAID_INTERNAL_TIMEOUT,
1117			 pmcraid_timeout_handler);
1118}
1119
1120static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1121static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1122
1123/**
1124 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1125 *
1126 * @cmd: initialized command block pointer
1127 *
1128 * Return Value
1129 *   none
1130 */
1131static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1132{
1133	if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1134		atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1135	else
1136		atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1137
1138	pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1139}
1140
1141/**
1142 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1143 *
1144 * @pinstance: pointer to adapter instance structure
1145 * @type: HCAM type
1146 *
1147 * Return Value
1148 *   pointer to initialized pmcraid_cmd structure or NULL
1149 */
1150static struct pmcraid_cmd *pmcraid_init_hcam
1151(
1152	struct pmcraid_instance *pinstance,
1153	u8 type
1154)
1155{
1156	struct pmcraid_cmd *cmd;
1157	struct pmcraid_ioarcb *ioarcb;
1158	struct pmcraid_ioadl_desc *ioadl;
1159	struct pmcraid_hostrcb *hcam;
1160	void (*cmd_done) (struct pmcraid_cmd *);
1161	dma_addr_t dma;
1162	int rcb_size;
1163
1164	cmd = pmcraid_get_free_cmd(pinstance);
1165
1166	if (!cmd) {
1167		pmcraid_err("no free command blocks for hcam\n");
1168		return cmd;
1169	}
1170
1171	if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1172		rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1173		cmd_done = pmcraid_process_ccn;
1174		dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1175		hcam = &pinstance->ccn;
1176	} else {
1177		rcb_size = sizeof(struct pmcraid_hcam_ldn);
1178		cmd_done = pmcraid_process_ldn;
1179		dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1180		hcam = &pinstance->ldn;
1181	}
1182
1183	/* initialize command pointer used for HCAM registration */
1184	hcam->cmd = cmd;
1185
1186	ioarcb = &cmd->ioa_cb->ioarcb;
1187	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1188					offsetof(struct pmcraid_ioarcb,
1189						add_data.u.ioadl[0]));
1190	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1191	ioadl = ioarcb->add_data.u.ioadl;
1192
1193	/* Initialize ioarcb */
1194	ioarcb->request_type = REQ_TYPE_HCAM;
1195	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1196	ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1197	ioarcb->cdb[1] = type;
1198	ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1199	ioarcb->cdb[8] = (rcb_size) & 0xFF;
1200
1201	ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1202
1203	ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1204	ioadl[0].data_len = cpu_to_le32(rcb_size);
1205	ioadl[0].address = cpu_to_le32(dma);
1206
1207	cmd->cmd_done = cmd_done;
1208	return cmd;
1209}
1210
1211/**
1212 * pmcraid_send_hcam - Send an HCAM to IOA
1213 * @pinstance: ioa config struct
1214 * @type: HCAM type
1215 *
1216 * This function will send a Host Controlled Async command to IOA.
1217 *
1218 * Return value:
1219 *	none
1220 */
1221static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1222{
1223	struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1224	pmcraid_send_hcam_cmd(cmd);
1225}
1226
1227
1228/**
1229 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1230 *
1231 * @cmd: pointer to cmd that is used as cancelling command
1232 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1233 */
1234static void pmcraid_prepare_cancel_cmd(
1235	struct pmcraid_cmd *cmd,
1236	struct pmcraid_cmd *cmd_to_cancel
1237)
1238{
1239	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1240	__be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1241
1242	/* Get the resource handle to where the command to be aborted has been
1243	 * sent.
1244	 */
1245	ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1246	ioarcb->request_type = REQ_TYPE_IOACMD;
1247	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1248	ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1249
1250	/* IOARCB address of the command to be cancelled is given in
1251	 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1252	 * IOARCB address are not masked.
1253	 */
1254	ioarcb_addr = cpu_to_be64(ioarcb_addr);
1255	memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1256}
1257
1258/**
1259 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1260 *
1261 * @cmd: command to be used as cancelling command
1262 * @type: HCAM type
1263 * @cmd_done: op done function for the cancelling command
1264 */
1265static void pmcraid_cancel_hcam(
1266	struct pmcraid_cmd *cmd,
1267	u8 type,
1268	void (*cmd_done) (struct pmcraid_cmd *)
1269)
1270{
1271	struct pmcraid_instance *pinstance;
1272	struct pmcraid_hostrcb  *hcam;
1273
1274	pinstance = cmd->drv_inst;
1275	hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1276		&pinstance->ldn : &pinstance->ccn;
1277
1278	/* prepare for cancelling previous hcam command. If the HCAM is
1279	 * currently not pending with IOA, we would have hcam->cmd as non-null
1280	 */
1281	if (hcam->cmd == NULL)
1282		return;
1283
1284	pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1285
1286	/* writing to IOARRIN must be protected by host_lock, as mid-layer
1287	 * schedule queuecommand while we are doing this
1288	 */
1289	pmcraid_send_cmd(cmd, cmd_done,
1290			 PMCRAID_INTERNAL_TIMEOUT,
1291			 pmcraid_timeout_handler);
1292}
1293
1294/**
1295 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1296 *
1297 * @cmd: command block to be used for cancelling the HCAM
1298 */
1299static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1300{
1301	pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1302		     cmd->ioa_cb->ioarcb.cdb[0],
1303		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1304
1305	pmcraid_reinit_cmdblk(cmd);
1306
1307	pmcraid_cancel_hcam(cmd,
1308			    PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1309			    pmcraid_ioa_shutdown);
1310}
1311
1312/**
1313 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1314 *
1315 * @cmd: command block to be used for cancelling the HCAM
1316 */
1317static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1318{
1319	pmcraid_cancel_hcam(cmd,
1320			    PMCRAID_HCAM_CODE_LOG_DATA,
1321			    pmcraid_cancel_ccn);
1322}
1323
1324/**
1325 * pmcraid_expose_resource - check if the resource can be exposed to OS
1326 *
1327 * @fw_version: firmware version code
1328 * @cfgte: pointer to configuration table entry of the resource
1329 *
1330 * Return value:
1331 *	true if resource can be added to midlayer, false(0) otherwise
1332 */
1333static int pmcraid_expose_resource(u16 fw_version,
1334				   struct pmcraid_config_table_entry *cfgte)
1335{
1336	int retval = 0;
1337
1338	if (cfgte->resource_type == RES_TYPE_VSET) {
1339		if (fw_version <= PMCRAID_FW_VERSION_1)
1340			retval = ((cfgte->unique_flags1 & 0x80) == 0);
1341		else
1342			retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1343				  (cfgte->unique_flags1 & 0x80) == 0);
1344
1345	} else if (cfgte->resource_type == RES_TYPE_GSCSI)
1346		retval = (RES_BUS(cfgte->resource_address) !=
1347				PMCRAID_VIRTUAL_ENCL_BUS_ID);
1348	return retval;
1349}
1350
1351/* attributes supported by pmcraid_event_family */
1352enum {
1353	PMCRAID_AEN_ATTR_UNSPEC,
1354	PMCRAID_AEN_ATTR_EVENT,
1355	__PMCRAID_AEN_ATTR_MAX,
1356};
1357#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1358
1359/* commands supported by pmcraid_event_family */
1360enum {
1361	PMCRAID_AEN_CMD_UNSPEC,
1362	PMCRAID_AEN_CMD_EVENT,
1363	__PMCRAID_AEN_CMD_MAX,
1364};
1365#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1366
1367static struct genl_multicast_group pmcraid_mcgrps[] = {
1368	{ .name = "events", /* not really used - see ID discussion below */ },
1369};
1370
1371static struct genl_family pmcraid_event_family = {
1372	/*
1373	 * Due to prior multicast group abuse (the code having assumed that
1374	 * the family ID can be used as a multicast group ID) we need to
1375	 * statically allocate a family (and thus group) ID.
1376	 */
1377	.id = GENL_ID_PMCRAID,
1378	.name = "pmcraid",
1379	.version = 1,
1380	.maxattr = PMCRAID_AEN_ATTR_MAX,
1381	.mcgrps = pmcraid_mcgrps,
1382	.n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
1383};
1384
1385/**
1386 * pmcraid_netlink_init - registers pmcraid_event_family
1387 *
1388 * Return value:
1389 *	0 if the pmcraid_event_family is successfully registered
1390 *	with netlink generic, non-zero otherwise
1391 */
1392static int pmcraid_netlink_init(void)
1393{
1394	int result;
1395
1396	result = genl_register_family(&pmcraid_event_family);
1397
1398	if (result)
1399		return result;
1400
1401	pmcraid_info("registered NETLINK GENERIC group: %d\n",
1402		     pmcraid_event_family.id);
1403
1404	return result;
1405}
1406
1407/**
1408 * pmcraid_netlink_release - unregisters pmcraid_event_family
1409 *
1410 * Return value:
1411 *	none
1412 */
1413static void pmcraid_netlink_release(void)
1414{
1415	genl_unregister_family(&pmcraid_event_family);
1416}
1417
1418/**
1419 * pmcraid_notify_aen - sends event msg to user space application
1420 * @pinstance: pointer to adapter instance structure
1421 * @type: HCAM type
1422 *
1423 * Return value:
1424 *	0 if success, error value in case of any failure.
1425 */
1426static int pmcraid_notify_aen(
1427	struct pmcraid_instance *pinstance,
1428	struct pmcraid_aen_msg  *aen_msg,
1429	u32    data_size
1430)
1431{
1432	struct sk_buff *skb;
1433	void *msg_header;
1434	u32  total_size, nla_genl_hdr_total_size;
1435	int result;
1436
1437	aen_msg->hostno = (pinstance->host->unique_id << 16 |
1438			   MINOR(pinstance->cdev.dev));
1439	aen_msg->length = data_size;
1440
1441	data_size += sizeof(*aen_msg);
1442
1443	total_size = nla_total_size(data_size);
1444	/* Add GENL_HDR to total_size */
1445	nla_genl_hdr_total_size =
1446		(total_size + (GENL_HDRLEN +
1447		((struct genl_family *)&pmcraid_event_family)->hdrsize)
1448		 + NLMSG_HDRLEN);
1449	skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1450
1451
1452	if (!skb) {
1453		pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1454			     total_size);
1455		return -ENOMEM;
1456	}
1457
1458	/* add the genetlink message header */
1459	msg_header = genlmsg_put(skb, 0, 0,
1460				 &pmcraid_event_family, 0,
1461				 PMCRAID_AEN_CMD_EVENT);
1462	if (!msg_header) {
1463		pmcraid_err("failed to copy command details\n");
1464		nlmsg_free(skb);
1465		return -ENOMEM;
1466	}
1467
1468	result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1469
1470	if (result) {
1471		pmcraid_err("failed to copy AEN attribute data\n");
1472		nlmsg_free(skb);
1473		return -EINVAL;
1474	}
1475
1476	/* send genetlink multicast message to notify appplications */
1477	genlmsg_end(skb, msg_header);
1478
1479	result = genlmsg_multicast(&pmcraid_event_family, skb,
1480				   0, 0, GFP_ATOMIC);
 
 
 
 
 
 
1481
1482	/* If there are no listeners, genlmsg_multicast may return non-zero
1483	 * value.
1484	 */
1485	if (result)
1486		pmcraid_info("error (%x) sending aen event message\n", result);
1487	return result;
1488}
1489
1490/**
1491 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1492 * @pinstance: pointer adapter instance structure
1493 *
1494 * Return value:
1495 *	0 if success, error value in case of any failure
1496 */
1497static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1498{
1499	return pmcraid_notify_aen(pinstance,
1500				pinstance->ccn.msg,
1501				pinstance->ccn.hcam->data_len +
1502				sizeof(struct pmcraid_hcam_hdr));
1503}
1504
1505/**
1506 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1507 * @pinstance: pointer adapter instance structure
1508 *
1509 * Return value:
1510 *	0 if success, error value in case of any failure
1511 */
1512static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1513{
1514	return pmcraid_notify_aen(pinstance,
1515				pinstance->ldn.msg,
1516				pinstance->ldn.hcam->data_len +
1517				sizeof(struct pmcraid_hcam_hdr));
1518}
1519
1520/**
1521 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1522 * @pinstance: pointer adapter instance structure
1523 * @evt: controller state event to be sent
1524 *
1525 * Return value:
1526 *	0 if success, error value in case of any failure
1527 */
1528static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1529{
1530	pinstance->scn.ioa_state = evt;
1531	pmcraid_notify_aen(pinstance,
1532			  &pinstance->scn.msg,
1533			  sizeof(u32));
1534}
1535
1536/**
1537 * pmcraid_handle_config_change - Handle a config change from the adapter
1538 * @pinstance: pointer to per adapter instance structure
1539 *
1540 * Return value:
1541 *  none
1542 */
1543
1544static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1545{
1546	struct pmcraid_config_table_entry *cfg_entry;
1547	struct pmcraid_hcam_ccn *ccn_hcam;
1548	struct pmcraid_cmd *cmd;
1549	struct pmcraid_cmd *cfgcmd;
1550	struct pmcraid_resource_entry *res = NULL;
1551	unsigned long lock_flags;
1552	unsigned long host_lock_flags;
1553	u32 new_entry = 1;
1554	u32 hidden_entry = 0;
1555	u16 fw_version;
1556	int rc;
1557
1558	ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1559	cfg_entry = &ccn_hcam->cfg_entry;
1560	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1561
1562	pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1563		 res: %x:%x:%x:%x\n",
1564		 pinstance->ccn.hcam->ilid,
1565		 pinstance->ccn.hcam->op_code,
1566		((pinstance->ccn.hcam->timestamp1) |
1567		((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1568		 pinstance->ccn.hcam->notification_type,
1569		 pinstance->ccn.hcam->notification_lost,
1570		 pinstance->ccn.hcam->flags,
1571		 pinstance->host->unique_id,
1572		 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1573		 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1574			RES_BUS(cfg_entry->resource_address)),
1575		 RES_IS_VSET(*cfg_entry) ?
1576			(fw_version <= PMCRAID_FW_VERSION_1 ?
1577				cfg_entry->unique_flags1 :
1578					cfg_entry->array_id & 0xFF) :
1579			RES_TARGET(cfg_entry->resource_address),
1580		 RES_LUN(cfg_entry->resource_address));
1581
1582
1583	/* If this HCAM indicates a lost notification, read the config table */
1584	if (pinstance->ccn.hcam->notification_lost) {
1585		cfgcmd = pmcraid_get_free_cmd(pinstance);
1586		if (cfgcmd) {
1587			pmcraid_info("lost CCN, reading config table\b");
1588			pinstance->reinit_cfg_table = 1;
1589			pmcraid_querycfg(cfgcmd);
1590		} else {
1591			pmcraid_err("lost CCN, no free cmd for querycfg\n");
1592		}
1593		goto out_notify_apps;
1594	}
1595
1596	/* If this resource is not going to be added to mid-layer, just notify
1597	 * applications and return. If this notification is about hiding a VSET
1598	 * resource, check if it was exposed already.
1599	 */
1600	if (pinstance->ccn.hcam->notification_type ==
1601	    NOTIFICATION_TYPE_ENTRY_CHANGED &&
1602	    cfg_entry->resource_type == RES_TYPE_VSET) {
1603
1604		if (fw_version <= PMCRAID_FW_VERSION_1)
1605			hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1606		else
1607			hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1608
1609	} else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1610		goto out_notify_apps;
1611	}
1612
1613	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1614	list_for_each_entry(res, &pinstance->used_res_q, queue) {
1615		rc = memcmp(&res->cfg_entry.resource_address,
1616			    &cfg_entry->resource_address,
1617			    sizeof(cfg_entry->resource_address));
1618		if (!rc) {
1619			new_entry = 0;
1620			break;
1621		}
1622	}
1623
1624	if (new_entry) {
1625
1626		if (hidden_entry) {
1627			spin_unlock_irqrestore(&pinstance->resource_lock,
1628						lock_flags);
1629			goto out_notify_apps;
1630		}
1631
1632		/* If there are more number of resources than what driver can
1633		 * manage, do not notify the applications about the CCN. Just
1634		 * ignore this notifications and re-register the same HCAM
1635		 */
1636		if (list_empty(&pinstance->free_res_q)) {
1637			spin_unlock_irqrestore(&pinstance->resource_lock,
1638						lock_flags);
1639			pmcraid_err("too many resources attached\n");
1640			spin_lock_irqsave(pinstance->host->host_lock,
1641					  host_lock_flags);
1642			pmcraid_send_hcam(pinstance,
1643					  PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1644			spin_unlock_irqrestore(pinstance->host->host_lock,
1645					       host_lock_flags);
1646			return;
1647		}
1648
1649		res = list_entry(pinstance->free_res_q.next,
1650				 struct pmcraid_resource_entry, queue);
1651
1652		list_del(&res->queue);
1653		res->scsi_dev = NULL;
1654		res->reset_progress = 0;
1655		list_add_tail(&res->queue, &pinstance->used_res_q);
1656	}
1657
1658	memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1659
1660	if (pinstance->ccn.hcam->notification_type ==
1661	    NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1662		if (res->scsi_dev) {
1663			if (fw_version <= PMCRAID_FW_VERSION_1)
1664				res->cfg_entry.unique_flags1 &= 0x7F;
1665			else
1666				res->cfg_entry.array_id &= 0xFF;
1667			res->change_detected = RES_CHANGE_DEL;
1668			res->cfg_entry.resource_handle =
1669				PMCRAID_INVALID_RES_HANDLE;
1670			schedule_work(&pinstance->worker_q);
1671		} else {
1672			/* This may be one of the non-exposed resources */
1673			list_move_tail(&res->queue, &pinstance->free_res_q);
1674		}
1675	} else if (!res->scsi_dev) {
1676		res->change_detected = RES_CHANGE_ADD;
1677		schedule_work(&pinstance->worker_q);
1678	}
1679	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1680
1681out_notify_apps:
1682
1683	/* Notify configuration changes to registered applications.*/
1684	if (!pmcraid_disable_aen)
1685		pmcraid_notify_ccn(pinstance);
1686
1687	cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1688	if (cmd)
1689		pmcraid_send_hcam_cmd(cmd);
1690}
1691
1692/**
1693 * pmcraid_get_error_info - return error string for an ioasc
1694 * @ioasc: ioasc code
1695 * Return Value
1696 *	 none
1697 */
1698static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1699{
1700	int i;
1701	for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1702		if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1703			return &pmcraid_ioasc_error_table[i];
1704	}
1705	return NULL;
1706}
1707
1708/**
1709 * pmcraid_ioasc_logger - log IOASC information based user-settings
1710 * @ioasc: ioasc code
1711 * @cmd: pointer to command that resulted in 'ioasc'
1712 */
1713void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1714{
1715	struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1716
1717	if (error_info == NULL ||
1718		cmd->drv_inst->current_log_level < error_info->log_level)
1719		return;
1720
1721	/* log the error string */
1722	pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1723		cmd->ioa_cb->ioarcb.cdb[0],
1724		cmd->ioa_cb->ioarcb.resource_handle,
1725		le32_to_cpu(ioasc), error_info->error_string);
1726}
1727
1728/**
1729 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1730 *
1731 * @pinstance: pointer to per adapter instance structure
1732 *
1733 * Return value:
1734 *  none
1735 */
1736static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1737{
1738	struct pmcraid_hcam_ldn *hcam_ldn;
1739	u32 ioasc;
1740
1741	hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1742
1743	pmcraid_info
1744		("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1745		 pinstance->ldn.hcam->ilid,
1746		 pinstance->ldn.hcam->op_code,
1747		 pinstance->ldn.hcam->notification_type,
1748		 pinstance->ldn.hcam->notification_lost,
1749		 pinstance->ldn.hcam->flags,
1750		 pinstance->ldn.hcam->overlay_id);
1751
1752	/* log only the errors, no need to log informational log entries */
1753	if (pinstance->ldn.hcam->notification_type !=
1754	    NOTIFICATION_TYPE_ERROR_LOG)
1755		return;
1756
1757	if (pinstance->ldn.hcam->notification_lost ==
1758	    HOSTRCB_NOTIFICATIONS_LOST)
1759		dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1760
1761	ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1762
1763	if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1764		ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1765		dev_info(&pinstance->pdev->dev,
1766			"UnitAttention due to IOA Bus Reset\n");
1767		scsi_report_bus_reset(
1768			pinstance->host,
1769			RES_BUS(hcam_ldn->error_log.fd_ra));
1770	}
1771
1772	return;
1773}
1774
1775/**
1776 * pmcraid_process_ccn - Op done function for a CCN.
1777 * @cmd: pointer to command struct
1778 *
1779 * This function is the op done function for a configuration
1780 * change notification
1781 *
1782 * Return value:
1783 * none
1784 */
1785static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1786{
1787	struct pmcraid_instance *pinstance = cmd->drv_inst;
1788	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1789	unsigned long lock_flags;
1790
1791	pinstance->ccn.cmd = NULL;
1792	pmcraid_return_cmd(cmd);
1793
1794	/* If driver initiated IOA reset happened while this hcam was pending
1795	 * with IOA, or IOA bringdown sequence is in progress, no need to
1796	 * re-register the hcam
1797	 */
1798	if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1799	    atomic_read(&pinstance->ccn.ignore) == 1) {
1800		return;
1801	} else if (ioasc) {
1802		dev_info(&pinstance->pdev->dev,
1803			"Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1804		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1805		pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1806		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1807	} else {
1808		pmcraid_handle_config_change(pinstance);
1809	}
1810}
1811
1812/**
1813 * pmcraid_process_ldn - op done function for an LDN
1814 * @cmd: pointer to command block
1815 *
1816 * Return value
1817 *   none
1818 */
1819static void pmcraid_initiate_reset(struct pmcraid_instance *);
1820static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1821
1822static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1823{
1824	struct pmcraid_instance *pinstance = cmd->drv_inst;
1825	struct pmcraid_hcam_ldn *ldn_hcam =
1826			(struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1827	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1828	u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1829	unsigned long lock_flags;
1830
1831	/* return the command block back to freepool */
1832	pinstance->ldn.cmd = NULL;
1833	pmcraid_return_cmd(cmd);
1834
1835	/* If driver initiated IOA reset happened while this hcam was pending
1836	 * with IOA, no need to re-register the hcam as reset engine will do it
1837	 * once reset sequence is complete
1838	 */
1839	if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1840	    atomic_read(&pinstance->ccn.ignore) == 1) {
1841		return;
1842	} else if (!ioasc) {
1843		pmcraid_handle_error_log(pinstance);
1844		if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1845			spin_lock_irqsave(pinstance->host->host_lock,
1846					  lock_flags);
1847			pmcraid_initiate_reset(pinstance);
1848			spin_unlock_irqrestore(pinstance->host->host_lock,
1849					       lock_flags);
1850			return;
1851		}
1852		if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1853			pinstance->timestamp_error = 1;
1854			pmcraid_set_timestamp(cmd);
1855		}
1856	} else {
1857		dev_info(&pinstance->pdev->dev,
1858			"Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1859	}
1860	/* send netlink message for HCAM notification if enabled */
1861	if (!pmcraid_disable_aen)
1862		pmcraid_notify_ldn(pinstance);
1863
1864	cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1865	if (cmd)
1866		pmcraid_send_hcam_cmd(cmd);
1867}
1868
1869/**
1870 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1871 *
1872 * @pinstance: pointer per adapter instance structure
1873 *
1874 * Return Value
1875 *   none
1876 */
1877static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1878{
1879	pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1880	pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1881}
1882
1883/**
1884 * pmcraid_unregister_hcams - cancel HCAMs registered already
1885 * @cmd: pointer to command used as part of reset sequence
1886 */
1887static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1888{
1889	struct pmcraid_instance *pinstance = cmd->drv_inst;
1890
1891	/* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1892	 * handling hcam response though it is not necessary. In order to
1893	 * prevent this, set 'ignore', so that bring-down sequence doesn't
1894	 * re-send any more hcams
1895	 */
1896	atomic_set(&pinstance->ccn.ignore, 1);
1897	atomic_set(&pinstance->ldn.ignore, 1);
1898
1899	/* If adapter reset was forced as part of runtime reset sequence,
1900	 * start the reset sequence. Reset will be triggered even in case
1901	 * IOA unit_check.
1902	 */
1903	if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1904	     pinstance->ioa_unit_check) {
1905		pinstance->force_ioa_reset = 0;
1906		pinstance->ioa_unit_check = 0;
1907		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1908		pmcraid_reset_alert(cmd);
1909		return;
1910	}
1911
1912	/* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1913	 * one after the other. So CCN cancellation will be triggered by
1914	 * pmcraid_cancel_ldn itself.
1915	 */
1916	pmcraid_cancel_ldn(cmd);
1917}
1918
1919/**
1920 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1921 * @pinstance: pointer to adapter instance structure
1922 * Return Value
1923 *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1924 */
1925static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1926
1927static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1928{
1929	u32 intrs;
1930
1931	pmcraid_reinit_buffers(pinstance);
1932	intrs = pmcraid_read_interrupts(pinstance);
1933
1934	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1935
1936	if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1937		if (!pinstance->interrupt_mode) {
1938			iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1939				pinstance->int_regs.
1940				ioa_host_interrupt_mask_reg);
1941			iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1942				pinstance->int_regs.ioa_host_interrupt_clr_reg);
1943		}
1944		return 1;
1945	} else {
1946		return 0;
1947	}
1948}
1949
1950/**
1951 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1952 * @cmd : pointer to reset command block
1953 *
1954 * Return Value
1955 *	none
1956 */
1957static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1958{
1959	struct pmcraid_instance *pinstance = cmd->drv_inst;
1960	u32 int_reg;
1961	u32 doorbell;
1962
1963	/* There will be an interrupt when Transition to Operational bit is
1964	 * set so tasklet would execute next reset task. The timeout handler
1965	 * would re-initiate a reset
1966	 */
1967	cmd->cmd_done = pmcraid_ioa_reset;
1968	cmd->timer.data = (unsigned long)cmd;
1969	cmd->timer.expires = jiffies +
1970			     msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
1971	cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
1972
1973	if (!timer_pending(&cmd->timer))
1974		add_timer(&cmd->timer);
1975
1976	/* Enable destructive diagnostics on IOA if it is not yet in
1977	 * operational state
1978	 */
1979	doorbell = DOORBELL_RUNTIME_RESET |
1980		   DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
1981
1982	/* Since we do RESET_ALERT and Start BIST we have to again write
1983	 * MSIX Doorbell to indicate the interrupt mode
1984	 */
1985	if (pinstance->interrupt_mode) {
1986		iowrite32(DOORBELL_INTR_MODE_MSIX,
1987			  pinstance->int_regs.host_ioa_interrupt_reg);
1988		ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
1989	}
1990
1991	iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
1992	ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1993	int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
1994
1995	pmcraid_info("Waiting for IOA to become operational %x:%x\n",
1996		     ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1997		     int_reg);
1998}
1999
2000/**
2001 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2002 *
2003 * @pinstance: pointer to adapter instance structure
2004 *
2005 * Return Value
2006 *	none
2007 */
2008static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2009{
2010	pmcraid_info("%s is not yet implemented\n", __func__);
2011}
2012
2013/**
2014 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2015 * @pinstance: pointer to adapter instance structure
2016 *
2017 * This function fails all outstanding ops. If they are submitted to IOA
2018 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2019 * otherwise just completes the commands and returns the cmd blocks to free
2020 * pool.
2021 *
2022 * Return value:
2023 *	 none
2024 */
2025static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2026{
2027	struct pmcraid_cmd *cmd, *temp;
2028	unsigned long lock_flags;
2029
2030	/* pending command list is protected by pending_pool_lock. Its
2031	 * traversal must be done as within this lock
2032	 */
2033	spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2034	list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2035				 free_list) {
2036		list_del(&cmd->free_list);
2037		spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2038					lock_flags);
2039		cmd->ioa_cb->ioasa.ioasc =
2040			cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2041		cmd->ioa_cb->ioasa.ilid =
2042			cpu_to_be32(PMCRAID_DRIVER_ILID);
2043
2044		/* In case the command timer is still running */
2045		del_timer(&cmd->timer);
2046
2047		/* If this is an IO command, complete it by invoking scsi_done
2048		 * function. If this is one of the internal commands other
2049		 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2050		 * complete it
2051		 */
2052		if (cmd->scsi_cmd) {
2053
2054			struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2055			__le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2056
2057			scsi_cmd->result |= DID_ERROR << 16;
2058
2059			scsi_dma_unmap(scsi_cmd);
2060			pmcraid_return_cmd(cmd);
2061
2062			pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2063				     le32_to_cpu(resp) >> 2,
2064				     cmd->ioa_cb->ioarcb.cdb[0],
2065				     scsi_cmd->result);
2066			scsi_cmd->scsi_done(scsi_cmd);
2067		} else if (cmd->cmd_done == pmcraid_internal_done ||
2068			   cmd->cmd_done == pmcraid_erp_done) {
2069			cmd->cmd_done(cmd);
2070		} else if (cmd->cmd_done != pmcraid_ioa_reset &&
2071			   cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2072			pmcraid_return_cmd(cmd);
2073		}
2074
2075		atomic_dec(&pinstance->outstanding_cmds);
2076		spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2077	}
2078
2079	spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2080}
2081
2082/**
2083 * pmcraid_ioa_reset - Implementation of IOA reset logic
2084 *
2085 * @cmd: pointer to the cmd block to be used for entire reset process
2086 *
2087 * This function executes most of the steps required for IOA reset. This gets
2088 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2089 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2090 * synchronized using host lock. Various functions called during reset process
2091 * would make use of a single command block, pointer to which is also stored in
2092 * adapter instance structure.
2093 *
2094 * Return Value
2095 *	 None
2096 */
2097static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2098{
2099	struct pmcraid_instance *pinstance = cmd->drv_inst;
2100	u8 reset_complete = 0;
2101
2102	pinstance->ioa_reset_in_progress = 1;
2103
2104	if (pinstance->reset_cmd != cmd) {
2105		pmcraid_err("reset is called with different command block\n");
2106		pinstance->reset_cmd = cmd;
2107	}
2108
2109	pmcraid_info("reset_engine: state = %d, command = %p\n",
2110		      pinstance->ioa_state, cmd);
2111
2112	switch (pinstance->ioa_state) {
2113
2114	case IOA_STATE_DEAD:
2115		/* If IOA is offline, whatever may be the reset reason, just
2116		 * return. callers might be waiting on the reset wait_q, wake
2117		 * up them
2118		 */
2119		pmcraid_err("IOA is offline no reset is possible\n");
2120		reset_complete = 1;
2121		break;
2122
2123	case IOA_STATE_IN_BRINGDOWN:
2124		/* we enter here, once ioa shutdown command is processed by IOA
2125		 * Alert IOA for a possible reset. If reset alert fails, IOA
2126		 * goes through hard-reset
2127		 */
2128		pmcraid_disable_interrupts(pinstance, ~0);
2129		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2130		pmcraid_reset_alert(cmd);
2131		break;
2132
2133	case IOA_STATE_UNKNOWN:
2134		/* We may be called during probe or resume. Some pre-processing
2135		 * is required for prior to reset
2136		 */
2137		scsi_block_requests(pinstance->host);
2138
2139		/* If asked to reset while IOA was processing responses or
2140		 * there are any error responses then IOA may require
2141		 * hard-reset.
2142		 */
2143		if (pinstance->ioa_hard_reset == 0) {
2144			if (ioread32(pinstance->ioa_status) &
2145			    INTRS_TRANSITION_TO_OPERATIONAL) {
2146				pmcraid_info("sticky bit set, bring-up\n");
2147				pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2148				pmcraid_reinit_cmdblk(cmd);
2149				pmcraid_identify_hrrq(cmd);
2150			} else {
2151				pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2152				pmcraid_soft_reset(cmd);
2153			}
2154		} else {
2155			/* Alert IOA of a possible reset and wait for critical
2156			 * operation in progress bit to reset
2157			 */
2158			pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2159			pmcraid_reset_alert(cmd);
2160		}
2161		break;
2162
2163	case IOA_STATE_IN_RESET_ALERT:
2164		/* If critical operation in progress bit is reset or wait gets
2165		 * timed out, reset proceeds with starting BIST on the IOA.
2166		 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2167		 * they are 3 or more, reset engine marks IOA dead and returns
2168		 */
2169		pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2170		pmcraid_start_bist(cmd);
2171		break;
2172
2173	case IOA_STATE_IN_HARD_RESET:
2174		pinstance->ioa_reset_attempts++;
2175
2176		/* retry reset if we haven't reached maximum allowed limit */
2177		if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2178			pinstance->ioa_reset_attempts = 0;
2179			pmcraid_err("IOA didn't respond marking it as dead\n");
2180			pinstance->ioa_state = IOA_STATE_DEAD;
2181
2182			if (pinstance->ioa_bringdown)
2183				pmcraid_notify_ioastate(pinstance,
2184					PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2185			else
2186				pmcraid_notify_ioastate(pinstance,
2187						PMC_DEVICE_EVENT_RESET_FAILED);
2188			reset_complete = 1;
2189			break;
2190		}
2191
2192		/* Once either bist or pci reset is done, restore PCI config
2193		 * space. If this fails, proceed with hard reset again
2194		 */
2195		pci_restore_state(pinstance->pdev);
2196
2197		/* fail all pending commands */
2198		pmcraid_fail_outstanding_cmds(pinstance);
2199
2200		/* check if unit check is active, if so extract dump */
2201		if (pinstance->ioa_unit_check) {
2202			pmcraid_info("unit check is active\n");
2203			pinstance->ioa_unit_check = 0;
2204			pmcraid_get_dump(pinstance);
2205			pinstance->ioa_reset_attempts--;
2206			pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2207			pmcraid_reset_alert(cmd);
2208			break;
2209		}
2210
2211		/* if the reset reason is to bring-down the ioa, we might be
2212		 * done with the reset restore pci_config_space and complete
2213		 * the reset
2214		 */
2215		if (pinstance->ioa_bringdown) {
2216			pmcraid_info("bringing down the adapter\n");
2217			pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2218			pinstance->ioa_bringdown = 0;
2219			pinstance->ioa_state = IOA_STATE_UNKNOWN;
2220			pmcraid_notify_ioastate(pinstance,
2221					PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2222			reset_complete = 1;
2223		} else {
2224			/* bring-up IOA, so proceed with soft reset
2225			 * Reinitialize hrrq_buffers and their indices also
2226			 * enable interrupts after a pci_restore_state
2227			 */
2228			if (pmcraid_reset_enable_ioa(pinstance)) {
2229				pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2230				pmcraid_info("bringing up the adapter\n");
2231				pmcraid_reinit_cmdblk(cmd);
2232				pmcraid_identify_hrrq(cmd);
2233			} else {
2234				pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2235				pmcraid_soft_reset(cmd);
2236			}
2237		}
2238		break;
2239
2240	case IOA_STATE_IN_SOFT_RESET:
2241		/* TRANSITION TO OPERATIONAL is on so start initialization
2242		 * sequence
2243		 */
2244		pmcraid_info("In softreset proceeding with bring-up\n");
2245		pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2246
2247		/* Initialization commands start with HRRQ identification. From
2248		 * now on tasklet completes most of the commands as IOA is up
2249		 * and intrs are enabled
2250		 */
2251		pmcraid_identify_hrrq(cmd);
2252		break;
2253
2254	case IOA_STATE_IN_BRINGUP:
2255		/* we are done with bringing up of IOA, change the ioa_state to
2256		 * operational and wake up any waiters
2257		 */
2258		pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2259		reset_complete = 1;
2260		break;
2261
2262	case IOA_STATE_OPERATIONAL:
2263	default:
2264		/* When IOA is operational and a reset is requested, check for
2265		 * the reset reason. If reset is to bring down IOA, unregister
2266		 * HCAMs and initiate shutdown; if adapter reset is forced then
2267		 * restart reset sequence again
2268		 */
2269		if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2270		    pinstance->force_ioa_reset == 0) {
2271			pmcraid_notify_ioastate(pinstance,
2272						PMC_DEVICE_EVENT_RESET_SUCCESS);
2273			reset_complete = 1;
2274		} else {
2275			if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2276				pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2277			pmcraid_reinit_cmdblk(cmd);
2278			pmcraid_unregister_hcams(cmd);
2279		}
2280		break;
2281	}
2282
2283	/* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2284	 * OPERATIONAL. Reset all control variables used during reset, wake up
2285	 * any waiting threads and let the SCSI mid-layer send commands. Note
2286	 * that host_lock must be held before invoking scsi_report_bus_reset.
2287	 */
2288	if (reset_complete) {
2289		pinstance->ioa_reset_in_progress = 0;
2290		pinstance->ioa_reset_attempts = 0;
2291		pinstance->reset_cmd = NULL;
2292		pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2293		pinstance->ioa_bringdown = 0;
2294		pmcraid_return_cmd(cmd);
2295
2296		/* If target state is to bring up the adapter, proceed with
2297		 * hcam registration and resource exposure to mid-layer.
2298		 */
2299		if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2300			pmcraid_register_hcams(pinstance);
2301
2302		wake_up_all(&pinstance->reset_wait_q);
2303	}
2304
2305	return;
2306}
2307
2308/**
2309 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2310 * ISR/tasklet during error interrupts including IOA unit check. If reset
2311 * is already in progress, it just returns, otherwise initiates IOA reset
2312 * to bring IOA up to operational state.
2313 *
2314 * @pinstance: pointer to adapter instance structure
2315 *
2316 * Return value
2317 *	 none
2318 */
2319static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2320{
2321	struct pmcraid_cmd *cmd;
2322
2323	/* If the reset is already in progress, just return, otherwise start
2324	 * reset sequence and return
2325	 */
2326	if (!pinstance->ioa_reset_in_progress) {
2327		scsi_block_requests(pinstance->host);
2328		cmd = pmcraid_get_free_cmd(pinstance);
2329
2330		if (cmd == NULL) {
2331			pmcraid_err("no cmnd blocks for initiate_reset\n");
2332			return;
2333		}
2334
2335		pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2336		pinstance->reset_cmd = cmd;
2337		pinstance->force_ioa_reset = 1;
2338		pmcraid_notify_ioastate(pinstance,
2339					PMC_DEVICE_EVENT_RESET_START);
2340		pmcraid_ioa_reset(cmd);
2341	}
2342}
2343
2344/**
2345 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2346 *			  or bringdown IOA
2347 * @pinstance: pointer adapter instance structure
2348 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2349 * @target_state: expected target state after reset
2350 *
2351 * Note: This command initiates reset and waits for its completion. Hence this
2352 * should not be called from isr/timer/tasklet functions (timeout handlers,
2353 * error response handlers and interrupt handlers).
2354 *
2355 * Return Value
2356 *	 1 in case ioa_state is not target_state, 0 otherwise.
2357 */
2358static int pmcraid_reset_reload(
2359	struct pmcraid_instance *pinstance,
2360	u8 shutdown_type,
2361	u8 target_state
2362)
2363{
2364	struct pmcraid_cmd *reset_cmd = NULL;
2365	unsigned long lock_flags;
2366	int reset = 1;
2367
2368	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2369
2370	if (pinstance->ioa_reset_in_progress) {
2371		pmcraid_info("reset_reload: reset is already in progress\n");
2372
2373		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2374
2375		wait_event(pinstance->reset_wait_q,
2376			   !pinstance->ioa_reset_in_progress);
2377
2378		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2379
2380		if (pinstance->ioa_state == IOA_STATE_DEAD) {
2381			spin_unlock_irqrestore(pinstance->host->host_lock,
2382					       lock_flags);
2383			pmcraid_info("reset_reload: IOA is dead\n");
2384			return reset;
2385		} else if (pinstance->ioa_state == target_state) {
2386			reset = 0;
2387		}
2388	}
2389
2390	if (reset) {
2391		pmcraid_info("reset_reload: proceeding with reset\n");
2392		scsi_block_requests(pinstance->host);
2393		reset_cmd = pmcraid_get_free_cmd(pinstance);
2394
2395		if (reset_cmd == NULL) {
2396			pmcraid_err("no free cmnd for reset_reload\n");
2397			spin_unlock_irqrestore(pinstance->host->host_lock,
2398					       lock_flags);
2399			return reset;
2400		}
2401
2402		if (shutdown_type == SHUTDOWN_NORMAL)
2403			pinstance->ioa_bringdown = 1;
2404
2405		pinstance->ioa_shutdown_type = shutdown_type;
2406		pinstance->reset_cmd = reset_cmd;
2407		pinstance->force_ioa_reset = reset;
2408		pmcraid_info("reset_reload: initiating reset\n");
2409		pmcraid_ioa_reset(reset_cmd);
2410		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2411		pmcraid_info("reset_reload: waiting for reset to complete\n");
2412		wait_event(pinstance->reset_wait_q,
2413			   !pinstance->ioa_reset_in_progress);
2414
2415		pmcraid_info("reset_reload: reset is complete !!\n");
2416		scsi_unblock_requests(pinstance->host);
2417		if (pinstance->ioa_state == target_state)
2418			reset = 0;
2419	}
2420
2421	return reset;
2422}
2423
2424/**
2425 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2426 *
2427 * @pinstance: pointer to adapter instance structure
2428 *
2429 * Return Value
2430 *	 whatever is returned from pmcraid_reset_reload
2431 */
2432static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2433{
2434	return pmcraid_reset_reload(pinstance,
2435				    SHUTDOWN_NORMAL,
2436				    IOA_STATE_UNKNOWN);
2437}
2438
2439/**
2440 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2441 *
2442 * @pinstance: pointer to adapter instance structure
2443 *
2444 * Return Value
2445 *	 whatever is returned from pmcraid_reset_reload
2446 */
2447static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2448{
2449	pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2450
2451	return pmcraid_reset_reload(pinstance,
2452				    SHUTDOWN_NONE,
2453				    IOA_STATE_OPERATIONAL);
2454}
2455
2456/**
2457 * pmcraid_request_sense - Send request sense to a device
2458 * @cmd: pmcraid command struct
2459 *
2460 * This function sends a request sense to a device as a result of a check
2461 * condition. This method re-uses the same command block that failed earlier.
2462 */
2463static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2464{
2465	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2466	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2467
2468	/* allocate DMAable memory for sense buffers */
2469	cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2470						 SCSI_SENSE_BUFFERSIZE,
2471						 &cmd->sense_buffer_dma);
2472
2473	if (cmd->sense_buffer == NULL) {
2474		pmcraid_err
2475			("couldn't allocate sense buffer for request sense\n");
2476		pmcraid_erp_done(cmd);
2477		return;
2478	}
2479
2480	/* re-use the command block */
2481	memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2482	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2483	ioarcb->request_flags0 = (SYNC_COMPLETE |
2484				  NO_LINK_DESCS |
2485				  INHIBIT_UL_CHECK);
2486	ioarcb->request_type = REQ_TYPE_SCSI;
2487	ioarcb->cdb[0] = REQUEST_SENSE;
2488	ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2489
2490	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2491					offsetof(struct pmcraid_ioarcb,
2492						add_data.u.ioadl[0]));
2493	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2494
2495	ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2496
2497	ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2498	ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2499	ioadl->flags = IOADL_FLAGS_LAST_DESC;
2500
2501	/* request sense might be called as part of error response processing
2502	 * which runs in tasklets context. It is possible that mid-layer might
2503	 * schedule queuecommand during this time, hence, writting to IOARRIN
2504	 * must be protect by host_lock
2505	 */
2506	pmcraid_send_cmd(cmd, pmcraid_erp_done,
2507			 PMCRAID_REQUEST_SENSE_TIMEOUT,
2508			 pmcraid_timeout_handler);
2509}
2510
2511/**
2512 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2513 * @cmd: command that failed
2514 * @sense: true if request_sense is required after cancel all
2515 *
2516 * This function sends a cancel all to a device to clear the queue.
2517 */
2518static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2519{
2520	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2521	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2522	struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2523	void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2524							: pmcraid_request_sense;
2525
2526	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2527	ioarcb->request_flags0 = SYNC_OVERRIDE;
2528	ioarcb->request_type = REQ_TYPE_IOACMD;
2529	ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2530
2531	if (RES_IS_GSCSI(res->cfg_entry))
2532		ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2533
2534	ioarcb->ioadl_bus_addr = 0;
2535	ioarcb->ioadl_length = 0;
2536	ioarcb->data_transfer_length = 0;
2537	ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2538
2539	/* writing to IOARRIN must be protected by host_lock, as mid-layer
2540	 * schedule queuecommand while we are doing this
2541	 */
2542	pmcraid_send_cmd(cmd, cmd_done,
2543			 PMCRAID_REQUEST_SENSE_TIMEOUT,
2544			 pmcraid_timeout_handler);
2545}
2546
2547/**
2548 * pmcraid_frame_auto_sense: frame fixed format sense information
2549 *
2550 * @cmd: pointer to failing command block
2551 *
2552 * Return value
2553 *  none
2554 */
2555static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2556{
2557	u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2558	struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2559	struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2560	u32 ioasc = le32_to_cpu(ioasa->ioasc);
2561	u32 failing_lba = 0;
2562
2563	memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2564	cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2565
2566	if (RES_IS_VSET(res->cfg_entry) &&
2567	    ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2568	    ioasa->u.vset.failing_lba_hi != 0) {
2569
2570		sense_buf[0] = 0x72;
2571		sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2572		sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2573		sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2574
2575		sense_buf[7] = 12;
2576		sense_buf[8] = 0;
2577		sense_buf[9] = 0x0A;
2578		sense_buf[10] = 0x80;
2579
2580		failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2581
2582		sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2583		sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2584		sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2585		sense_buf[15] = failing_lba & 0x000000ff;
2586
2587		failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2588
2589		sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2590		sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2591		sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2592		sense_buf[19] = failing_lba & 0x000000ff;
2593	} else {
2594		sense_buf[0] = 0x70;
2595		sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2596		sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2597		sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2598
2599		if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2600			if (RES_IS_VSET(res->cfg_entry))
2601				failing_lba =
2602					le32_to_cpu(ioasa->u.
2603						 vset.failing_lba_lo);
2604			sense_buf[0] |= 0x80;
2605			sense_buf[3] = (failing_lba >> 24) & 0xff;
2606			sense_buf[4] = (failing_lba >> 16) & 0xff;
2607			sense_buf[5] = (failing_lba >> 8) & 0xff;
2608			sense_buf[6] = failing_lba & 0xff;
2609		}
2610
2611		sense_buf[7] = 6; /* additional length */
2612	}
2613}
2614
2615/**
2616 * pmcraid_error_handler - Error response handlers for a SCSI op
2617 * @cmd: pointer to pmcraid_cmd that has failed
2618 *
2619 * This function determines whether or not to initiate ERP on the affected
2620 * device. This is called from a tasklet, which doesn't hold any locks.
2621 *
2622 * Return value:
2623 *	 0 it caller can complete the request, otherwise 1 where in error
2624 *	 handler itself completes the request and returns the command block
2625 *	 back to free-pool
2626 */
2627static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2628{
2629	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2630	struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2631	struct pmcraid_instance *pinstance = cmd->drv_inst;
2632	struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2633	u32 ioasc = le32_to_cpu(ioasa->ioasc);
2634	u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2635	u32 sense_copied = 0;
2636
2637	if (!res) {
2638		pmcraid_info("resource pointer is NULL\n");
2639		return 0;
2640	}
2641
2642	/* If this was a SCSI read/write command keep count of errors */
2643	if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2644		atomic_inc(&res->read_failures);
2645	else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2646		atomic_inc(&res->write_failures);
2647
2648	if (!RES_IS_GSCSI(res->cfg_entry) &&
2649		masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2650		pmcraid_frame_auto_sense(cmd);
2651	}
2652
2653	/* Log IOASC/IOASA information based on user settings */
2654	pmcraid_ioasc_logger(ioasc, cmd);
2655
2656	switch (masked_ioasc) {
2657
2658	case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2659		scsi_cmd->result |= (DID_ABORT << 16);
2660		break;
2661
2662	case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2663	case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2664		scsi_cmd->result |= (DID_NO_CONNECT << 16);
2665		break;
2666
2667	case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2668		res->sync_reqd = 1;
2669		scsi_cmd->result |= (DID_IMM_RETRY << 16);
2670		break;
2671
2672	case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2673		scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2674		break;
2675
2676	case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2677	case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2678		if (!res->reset_progress)
2679			scsi_report_bus_reset(pinstance->host,
2680					      scsi_cmd->device->channel);
2681		scsi_cmd->result |= (DID_ERROR << 16);
2682		break;
2683
2684	case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2685		scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2686		res->sync_reqd = 1;
2687
2688		/* if check_condition is not active return with error otherwise
2689		 * get/frame the sense buffer
2690		 */
2691		if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2692		    SAM_STAT_CHECK_CONDITION &&
2693		    PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2694			return 0;
2695
2696		/* If we have auto sense data as part of IOASA pass it to
2697		 * mid-layer
2698		 */
2699		if (ioasa->auto_sense_length != 0) {
2700			short sense_len = ioasa->auto_sense_length;
2701			int data_size = min_t(u16, le16_to_cpu(sense_len),
2702					      SCSI_SENSE_BUFFERSIZE);
2703
2704			memcpy(scsi_cmd->sense_buffer,
2705			       ioasa->sense_data,
2706			       data_size);
2707			sense_copied = 1;
2708		}
2709
2710		if (RES_IS_GSCSI(res->cfg_entry))
2711			pmcraid_cancel_all(cmd, sense_copied);
2712		else if (sense_copied)
2713			pmcraid_erp_done(cmd);
2714		else
2715			pmcraid_request_sense(cmd);
2716
2717		return 1;
2718
2719	case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2720		break;
2721
2722	default:
2723		if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2724			scsi_cmd->result |= (DID_ERROR << 16);
2725		break;
2726	}
2727	return 0;
2728}
2729
2730/**
2731 * pmcraid_reset_device - device reset handler functions
2732 *
2733 * @scsi_cmd: scsi command struct
2734 * @modifier: reset modifier indicating the reset sequence to be performed
2735 *
2736 * This function issues a device reset to the affected device.
2737 * A LUN reset will be sent to the device first. If that does
2738 * not work, a target reset will be sent.
2739 *
2740 * Return value:
2741 *	SUCCESS / FAILED
2742 */
2743static int pmcraid_reset_device(
2744	struct scsi_cmnd *scsi_cmd,
2745	unsigned long timeout,
2746	u8 modifier
2747)
2748{
2749	struct pmcraid_cmd *cmd;
2750	struct pmcraid_instance *pinstance;
2751	struct pmcraid_resource_entry *res;
2752	struct pmcraid_ioarcb *ioarcb;
2753	unsigned long lock_flags;
2754	u32 ioasc;
2755
2756	pinstance =
2757		(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2758	res = scsi_cmd->device->hostdata;
2759
2760	if (!res) {
2761		sdev_printk(KERN_ERR, scsi_cmd->device,
2762			    "reset_device: NULL resource pointer\n");
2763		return FAILED;
2764	}
2765
2766	/* If adapter is currently going through reset/reload, return failed.
2767	 * This will force the mid-layer to call _eh_bus/host reset, which
2768	 * will then go to sleep and wait for the reset to complete
2769	 */
2770	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2771	if (pinstance->ioa_reset_in_progress ||
2772	    pinstance->ioa_state == IOA_STATE_DEAD) {
2773		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2774		return FAILED;
2775	}
2776
2777	res->reset_progress = 1;
2778	pmcraid_info("Resetting %s resource with addr %x\n",
2779		     ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2780		     ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2781		     le32_to_cpu(res->cfg_entry.resource_address));
2782
2783	/* get a free cmd block */
2784	cmd = pmcraid_get_free_cmd(pinstance);
2785
2786	if (cmd == NULL) {
2787		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2788		pmcraid_err("%s: no cmd blocks are available\n", __func__);
2789		return FAILED;
2790	}
2791
2792	ioarcb = &cmd->ioa_cb->ioarcb;
2793	ioarcb->resource_handle = res->cfg_entry.resource_handle;
2794	ioarcb->request_type = REQ_TYPE_IOACMD;
2795	ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2796
2797	/* Initialize reset modifier bits */
2798	if (modifier)
2799		modifier = ENABLE_RESET_MODIFIER | modifier;
2800
2801	ioarcb->cdb[1] = modifier;
2802
2803	init_completion(&cmd->wait_for_completion);
2804	cmd->completion_req = 1;
2805
2806	pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2807		     cmd->ioa_cb->ioarcb.cdb[0],
2808		     le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2809		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2810
2811	pmcraid_send_cmd(cmd,
2812			 pmcraid_internal_done,
2813			 timeout,
2814			 pmcraid_timeout_handler);
2815
2816	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2817
2818	/* RESET_DEVICE command completes after all pending IOARCBs are
2819	 * completed. Once this command is completed, pmcraind_internal_done
2820	 * will wake up the 'completion' queue.
2821	 */
2822	wait_for_completion(&cmd->wait_for_completion);
2823
2824	/* complete the command here itself and return the command block
2825	 * to free list
2826	 */
2827	pmcraid_return_cmd(cmd);
2828	res->reset_progress = 0;
2829	ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2830
2831	/* set the return value based on the returned ioasc */
2832	return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2833}
2834
2835/**
2836 * _pmcraid_io_done - helper for pmcraid_io_done function
2837 *
2838 * @cmd: pointer to pmcraid command struct
2839 * @reslen: residual data length to be set in the ioasa
2840 * @ioasc: ioasc either returned by IOA or set by driver itself.
2841 *
2842 * This function is invoked by pmcraid_io_done to complete mid-layer
2843 * scsi ops.
2844 *
2845 * Return value:
2846 *	  0 if caller is required to return it to free_pool. Returns 1 if
2847 *	  caller need not worry about freeing command block as error handler
2848 *	  will take care of that.
2849 */
2850
2851static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2852{
2853	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2854	int rc = 0;
2855
2856	scsi_set_resid(scsi_cmd, reslen);
2857
2858	pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2859		le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2860		cmd->ioa_cb->ioarcb.cdb[0],
2861		ioasc, scsi_cmd->result);
2862
2863	if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2864		rc = pmcraid_error_handler(cmd);
2865
2866	if (rc == 0) {
2867		scsi_dma_unmap(scsi_cmd);
2868		scsi_cmd->scsi_done(scsi_cmd);
2869	}
2870
2871	return rc;
2872}
2873
2874/**
2875 * pmcraid_io_done - SCSI completion function
2876 *
2877 * @cmd: pointer to pmcraid command struct
2878 *
2879 * This function is invoked by tasklet/mid-layer error handler to completing
2880 * the SCSI ops sent from mid-layer.
2881 *
2882 * Return value
2883 *	  none
2884 */
2885
2886static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2887{
2888	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2889	u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2890
2891	if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2892		pmcraid_return_cmd(cmd);
2893}
2894
2895/**
2896 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2897 *
2898 * @cmd: command block of the command to be aborted
2899 *
2900 * Return Value:
2901 *	 returns pointer to command structure used as cancelling cmd
2902 */
2903static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2904{
2905	struct pmcraid_cmd *cancel_cmd;
2906	struct pmcraid_instance *pinstance;
2907	struct pmcraid_resource_entry *res;
2908
2909	pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2910	res = cmd->scsi_cmd->device->hostdata;
2911
2912	cancel_cmd = pmcraid_get_free_cmd(pinstance);
2913
2914	if (cancel_cmd == NULL) {
2915		pmcraid_err("%s: no cmd blocks are available\n", __func__);
2916		return NULL;
2917	}
2918
2919	pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2920
2921	pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2922		cmd->ioa_cb->ioarcb.cdb[0],
2923		cmd->ioa_cb->ioarcb.response_handle >> 2);
2924
2925	init_completion(&cancel_cmd->wait_for_completion);
2926	cancel_cmd->completion_req = 1;
2927
2928	pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2929		le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2930		cancel_cmd->ioa_cb->ioarcb.cdb[0],
2931		le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2932
2933	pmcraid_send_cmd(cancel_cmd,
2934			 pmcraid_internal_done,
2935			 PMCRAID_INTERNAL_TIMEOUT,
2936			 pmcraid_timeout_handler);
2937	return cancel_cmd;
2938}
2939
2940/**
2941 * pmcraid_abort_complete - Waits for ABORT TASK completion
2942 *
2943 * @cancel_cmd: command block use as cancelling command
2944 *
2945 * Return Value:
2946 *	 returns SUCCESS if ABORT TASK has good completion
2947 *	 otherwise FAILED
2948 */
2949static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2950{
2951	struct pmcraid_resource_entry *res;
2952	u32 ioasc;
2953
2954	wait_for_completion(&cancel_cmd->wait_for_completion);
2955	res = cancel_cmd->res;
2956	cancel_cmd->res = NULL;
2957	ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2958
2959	/* If the abort task is not timed out we will get a Good completion
2960	 * as sense_key, otherwise we may get one the following responses
2961	 * due to subsequent bus reset or device reset. In case IOASC is
2962	 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2963	 */
2964	if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
2965	    ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
2966		if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
2967			res->sync_reqd = 1;
2968		ioasc = 0;
2969	}
2970
2971	/* complete the command here itself */
2972	pmcraid_return_cmd(cancel_cmd);
2973	return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2974}
2975
2976/**
2977 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
2978 *
2979 * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
2980 *		mid-layer ensures that no other commands are queued. This
2981 *		never gets called under interrupt, but a separate eh thread.
2982 *
2983 * Return value:
2984 *	 SUCCESS / FAILED
2985 */
2986static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
2987{
2988	struct pmcraid_instance *pinstance;
2989	struct pmcraid_cmd *cmd;
2990	struct pmcraid_resource_entry *res;
2991	unsigned long host_lock_flags;
2992	unsigned long pending_lock_flags;
2993	struct pmcraid_cmd *cancel_cmd = NULL;
2994	int cmd_found = 0;
2995	int rc = FAILED;
2996
2997	pinstance =
2998		(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2999
3000	scmd_printk(KERN_INFO, scsi_cmd,
3001		    "I/O command timed out, aborting it.\n");
3002
3003	res = scsi_cmd->device->hostdata;
3004
3005	if (res == NULL)
3006		return rc;
3007
3008	/* If we are currently going through reset/reload, return failed.
3009	 * This will force the mid-layer to eventually call
3010	 * pmcraid_eh_host_reset which will then go to sleep and wait for the
3011	 * reset to complete
3012	 */
3013	spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3014
3015	if (pinstance->ioa_reset_in_progress ||
3016	    pinstance->ioa_state == IOA_STATE_DEAD) {
3017		spin_unlock_irqrestore(pinstance->host->host_lock,
3018				       host_lock_flags);
3019		return rc;
3020	}
3021
3022	/* loop over pending cmd list to find cmd corresponding to this
3023	 * scsi_cmd. Note that this command might not have been completed
3024	 * already. locking: all pending commands are protected with
3025	 * pending_pool_lock.
3026	 */
3027	spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3028	list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3029
3030		if (cmd->scsi_cmd == scsi_cmd) {
3031			cmd_found = 1;
3032			break;
3033		}
3034	}
3035
3036	spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3037				pending_lock_flags);
3038
3039	/* If the command to be aborted was given to IOA and still pending with
3040	 * it, send ABORT_TASK to abort this and wait for its completion
3041	 */
3042	if (cmd_found)
3043		cancel_cmd = pmcraid_abort_cmd(cmd);
3044
3045	spin_unlock_irqrestore(pinstance->host->host_lock,
3046			       host_lock_flags);
3047
3048	if (cancel_cmd) {
3049		cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3050		rc = pmcraid_abort_complete(cancel_cmd);
3051	}
3052
3053	return cmd_found ? rc : SUCCESS;
3054}
3055
3056/**
3057 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3058 *
3059 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3060 *
3061 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3062 * Since these are called from mid-layer EH thread, no other IO will be queued
3063 * to the resource being reset. However, control path (IOCTL) may be active so
3064 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3065 * takes care by locking/unlocking host_lock.
3066 *
3067 * Return value
3068 *	SUCCESS or FAILED
3069 */
3070static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3071{
3072	scmd_printk(KERN_INFO, scmd,
3073		    "resetting device due to an I/O command timeout.\n");
3074	return pmcraid_reset_device(scmd,
3075				    PMCRAID_INTERNAL_TIMEOUT,
3076				    RESET_DEVICE_LUN);
3077}
3078
3079static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3080{
3081	scmd_printk(KERN_INFO, scmd,
3082		    "Doing bus reset due to an I/O command timeout.\n");
3083	return pmcraid_reset_device(scmd,
3084				    PMCRAID_RESET_BUS_TIMEOUT,
3085				    RESET_DEVICE_BUS);
3086}
3087
3088static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3089{
3090	scmd_printk(KERN_INFO, scmd,
3091		    "Doing target reset due to an I/O command timeout.\n");
3092	return pmcraid_reset_device(scmd,
3093				    PMCRAID_INTERNAL_TIMEOUT,
3094				    RESET_DEVICE_TARGET);
3095}
3096
3097/**
3098 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3099 *
3100 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3101 *
3102 * Initiates adapter reset to bring it up to operational state
3103 *
3104 * Return value
3105 *	SUCCESS or FAILED
3106 */
3107static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3108{
3109	unsigned long interval = 10000; /* 10 seconds interval */
3110	int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3111	struct pmcraid_instance *pinstance =
3112		(struct pmcraid_instance *)(scmd->device->host->hostdata);
3113
3114
3115	/* wait for an additional 150 seconds just in case firmware could come
3116	 * up and if it could complete all the pending commands excluding the
3117	 * two HCAM (CCN and LDN).
3118	 */
3119	while (waits--) {
3120		if (atomic_read(&pinstance->outstanding_cmds) <=
3121		    PMCRAID_MAX_HCAM_CMD)
3122			return SUCCESS;
3123		msleep(interval);
3124	}
3125
3126	dev_err(&pinstance->pdev->dev,
3127		"Adapter being reset due to an I/O command timeout.\n");
3128	return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3129}
3130
3131/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3132 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3133 * @cmd: pmcraid command struct
3134 * @sgcount: count of scatter-gather elements
3135 *
3136 * Return value
3137 *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
3138 *   or external IOADLs
3139 */
3140struct pmcraid_ioadl_desc *
3141pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3142{
3143	struct pmcraid_ioadl_desc *ioadl;
3144	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3145	int ioadl_count = 0;
3146
3147	if (ioarcb->add_cmd_param_length)
3148		ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3149	ioarcb->ioadl_length =
3150		sizeof(struct pmcraid_ioadl_desc) * sgcount;
3151
3152	if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3153		/* external ioadls start at offset 0x80 from control_block
3154		 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3155		 * It is necessary to indicate to firmware that driver is
3156		 * using ioadls to be treated as external to IOARCB.
3157		 */
3158		ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3159		ioarcb->ioadl_bus_addr =
3160			cpu_to_le64((cmd->ioa_cb_bus_addr) +
3161				offsetof(struct pmcraid_ioarcb,
3162					add_data.u.ioadl[3]));
3163		ioadl = &ioarcb->add_data.u.ioadl[3];
3164	} else {
3165		ioarcb->ioadl_bus_addr =
3166			cpu_to_le64((cmd->ioa_cb_bus_addr) +
3167				offsetof(struct pmcraid_ioarcb,
3168					add_data.u.ioadl[ioadl_count]));
3169
3170		ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3171		ioarcb->ioarcb_bus_addr |=
3172				DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3173	}
3174
3175	return ioadl;
3176}
3177
3178/**
3179 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3180 * @pinstance: pointer to adapter instance structure
3181 * @cmd: pmcraid command struct
3182 *
3183 * This function is invoked by queuecommand entry point while sending a command
3184 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3185 *
3186 * Return value:
3187 *	0 on success or -1 on failure
3188 */
3189static int pmcraid_build_ioadl(
3190	struct pmcraid_instance *pinstance,
3191	struct pmcraid_cmd *cmd
3192)
3193{
3194	int i, nseg;
3195	struct scatterlist *sglist;
3196
3197	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3198	struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3199	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3200
3201	u32 length = scsi_bufflen(scsi_cmd);
3202
3203	if (!length)
3204		return 0;
3205
3206	nseg = scsi_dma_map(scsi_cmd);
3207
3208	if (nseg < 0) {
3209		scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3210		return -1;
3211	} else if (nseg > PMCRAID_MAX_IOADLS) {
3212		scsi_dma_unmap(scsi_cmd);
3213		scmd_printk(KERN_ERR, scsi_cmd,
3214			"sg count is (%d) more than allowed!\n", nseg);
3215		return -1;
3216	}
3217
3218	/* Initialize IOARCB data transfer length fields */
3219	if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3220		ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3221
3222	ioarcb->request_flags0 |= NO_LINK_DESCS;
3223	ioarcb->data_transfer_length = cpu_to_le32(length);
3224	ioadl = pmcraid_init_ioadls(cmd, nseg);
3225
3226	/* Initialize IOADL descriptor addresses */
3227	scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3228		ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3229		ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3230		ioadl[i].flags = 0;
3231	}
3232	/* setup last descriptor */
3233	ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3234
3235	return 0;
3236}
3237
3238/**
3239 * pmcraid_free_sglist - Frees an allocated SG buffer list
3240 * @sglist: scatter/gather list pointer
3241 *
3242 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3243 *
3244 * Return value:
3245 *	none
3246 */
3247static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3248{
3249	int i;
3250
3251	for (i = 0; i < sglist->num_sg; i++)
3252		__free_pages(sg_page(&(sglist->scatterlist[i])),
3253			     sglist->order);
3254
3255	kfree(sglist);
3256}
3257
3258/**
3259 * pmcraid_alloc_sglist - Allocates memory for a SG list
3260 * @buflen: buffer length
3261 *
3262 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3263 * list.
3264 *
3265 * Return value
3266 *	pointer to sglist / NULL on failure
3267 */
3268static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3269{
3270	struct pmcraid_sglist *sglist;
3271	struct scatterlist *scatterlist;
3272	struct page *page;
3273	int num_elem, i, j;
3274	int sg_size;
3275	int order;
3276	int bsize_elem;
3277
3278	sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3279	order = (sg_size > 0) ? get_order(sg_size) : 0;
3280	bsize_elem = PAGE_SIZE * (1 << order);
3281
3282	/* Determine the actual number of sg entries needed */
3283	if (buflen % bsize_elem)
3284		num_elem = (buflen / bsize_elem) + 1;
3285	else
3286		num_elem = buflen / bsize_elem;
3287
3288	/* Allocate a scatter/gather list for the DMA */
3289	sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3290			 (sizeof(struct scatterlist) * (num_elem - 1)),
3291			 GFP_KERNEL);
3292
3293	if (sglist == NULL)
3294		return NULL;
3295
3296	scatterlist = sglist->scatterlist;
3297	sg_init_table(scatterlist, num_elem);
3298	sglist->order = order;
3299	sglist->num_sg = num_elem;
3300	sg_size = buflen;
3301
3302	for (i = 0; i < num_elem; i++) {
3303		page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3304		if (!page) {
3305			for (j = i - 1; j >= 0; j--)
3306				__free_pages(sg_page(&scatterlist[j]), order);
3307			kfree(sglist);
3308			return NULL;
3309		}
3310
3311		sg_set_page(&scatterlist[i], page,
3312			sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3313		sg_size -= bsize_elem;
3314	}
3315
3316	return sglist;
3317}
3318
3319/**
3320 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3321 * @sglist: scatter/gather list pointer
3322 * @buffer: buffer pointer
3323 * @len: buffer length
3324 * @direction: data transfer direction
3325 *
3326 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3327 *
3328 * Return value:
3329 * 0 on success / other on failure
3330 */
3331static int pmcraid_copy_sglist(
3332	struct pmcraid_sglist *sglist,
3333	unsigned long buffer,
3334	u32 len,
3335	int direction
3336)
3337{
3338	struct scatterlist *scatterlist;
3339	void *kaddr;
3340	int bsize_elem;
3341	int i;
3342	int rc = 0;
3343
3344	/* Determine the actual number of bytes per element */
3345	bsize_elem = PAGE_SIZE * (1 << sglist->order);
3346
3347	scatterlist = sglist->scatterlist;
3348
3349	for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3350		struct page *page = sg_page(&scatterlist[i]);
3351
3352		kaddr = kmap(page);
3353		if (direction == DMA_TO_DEVICE)
3354			rc = __copy_from_user(kaddr,
3355					      (void *)buffer,
3356					      bsize_elem);
3357		else
3358			rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3359
3360		kunmap(page);
3361
3362		if (rc) {
3363			pmcraid_err("failed to copy user data into sg list\n");
3364			return -EFAULT;
3365		}
3366
3367		scatterlist[i].length = bsize_elem;
3368	}
3369
3370	if (len % bsize_elem) {
3371		struct page *page = sg_page(&scatterlist[i]);
3372
3373		kaddr = kmap(page);
3374
3375		if (direction == DMA_TO_DEVICE)
3376			rc = __copy_from_user(kaddr,
3377					      (void *)buffer,
3378					      len % bsize_elem);
3379		else
3380			rc = __copy_to_user((void *)buffer,
3381					    kaddr,
3382					    len % bsize_elem);
3383
3384		kunmap(page);
3385
3386		scatterlist[i].length = len % bsize_elem;
3387	}
3388
3389	if (rc) {
3390		pmcraid_err("failed to copy user data into sg list\n");
3391		rc = -EFAULT;
3392	}
3393
3394	return rc;
3395}
3396
3397/**
3398 * pmcraid_queuecommand - Queue a mid-layer request
3399 * @scsi_cmd: scsi command struct
3400 * @done: done function
3401 *
3402 * This function queues a request generated by the mid-layer. Midlayer calls
3403 * this routine within host->lock. Some of the functions called by queuecommand
3404 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3405 *
3406 * Return value:
3407 *	  0 on success
3408 *	  SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3409 *	  SCSI_MLQUEUE_HOST_BUSY if host is busy
3410 */
3411static int pmcraid_queuecommand_lck(
3412	struct scsi_cmnd *scsi_cmd,
3413	void (*done) (struct scsi_cmnd *)
3414)
3415{
3416	struct pmcraid_instance *pinstance;
3417	struct pmcraid_resource_entry *res;
3418	struct pmcraid_ioarcb *ioarcb;
3419	struct pmcraid_cmd *cmd;
3420	u32 fw_version;
3421	int rc = 0;
3422
3423	pinstance =
3424		(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3425	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3426	scsi_cmd->scsi_done = done;
3427	res = scsi_cmd->device->hostdata;
3428	scsi_cmd->result = (DID_OK << 16);
3429
3430	/* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3431	 * the command
3432	 */
3433	if (pinstance->ioa_state == IOA_STATE_DEAD) {
3434		pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3435		scsi_cmd->result = (DID_NO_CONNECT << 16);
3436		scsi_cmd->scsi_done(scsi_cmd);
3437		return 0;
3438	}
3439
3440	/* If IOA reset is in progress, can't queue the commands */
3441	if (pinstance->ioa_reset_in_progress)
3442		return SCSI_MLQUEUE_HOST_BUSY;
3443
3444	/* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3445	 * the command here itself with success return
3446	 */
3447	if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3448		pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3449		scsi_cmd->scsi_done(scsi_cmd);
3450		return 0;
3451	}
3452
3453	/* initialize the command and IOARCB to be sent to IOA */
3454	cmd = pmcraid_get_free_cmd(pinstance);
3455
3456	if (cmd == NULL) {
3457		pmcraid_err("free command block is not available\n");
3458		return SCSI_MLQUEUE_HOST_BUSY;
3459	}
3460
3461	cmd->scsi_cmd = scsi_cmd;
3462	ioarcb = &(cmd->ioa_cb->ioarcb);
3463	memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3464	ioarcb->resource_handle = res->cfg_entry.resource_handle;
3465	ioarcb->request_type = REQ_TYPE_SCSI;
3466
3467	/* set hrrq number where the IOA should respond to. Note that all cmds
3468	 * generated internally uses hrrq_id 0, exception to this is the cmd
3469	 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3470	 * hrrq_id assigned here in queuecommand
3471	 */
3472	ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3473			  pinstance->num_hrrq;
3474	cmd->cmd_done = pmcraid_io_done;
3475
3476	if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3477		if (scsi_cmd->underflow == 0)
3478			ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3479
3480		if (res->sync_reqd) {
3481			ioarcb->request_flags0 |= SYNC_COMPLETE;
3482			res->sync_reqd = 0;
3483		}
3484
3485		ioarcb->request_flags0 |= NO_LINK_DESCS;
3486
3487		if (scsi_cmd->flags & SCMD_TAGGED)
3488			ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
3489
3490		if (RES_IS_GSCSI(res->cfg_entry))
3491			ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3492	}
3493
3494	rc = pmcraid_build_ioadl(pinstance, cmd);
3495
3496	pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3497		     le32_to_cpu(ioarcb->response_handle) >> 2,
3498		     scsi_cmd->cmnd[0], pinstance->host->unique_id,
3499		     RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3500			PMCRAID_PHYS_BUS_ID,
3501		     RES_IS_VSET(res->cfg_entry) ?
3502			(fw_version <= PMCRAID_FW_VERSION_1 ?
3503				res->cfg_entry.unique_flags1 :
3504					res->cfg_entry.array_id & 0xFF) :
3505			RES_TARGET(res->cfg_entry.resource_address),
3506		     RES_LUN(res->cfg_entry.resource_address));
3507
3508	if (likely(rc == 0)) {
3509		_pmcraid_fire_command(cmd);
3510	} else {
3511		pmcraid_err("queuecommand could not build ioadl\n");
3512		pmcraid_return_cmd(cmd);
3513		rc = SCSI_MLQUEUE_HOST_BUSY;
3514	}
3515
3516	return rc;
3517}
3518
3519static DEF_SCSI_QCMD(pmcraid_queuecommand)
3520
3521/**
3522 * pmcraid_open -char node "open" entry, allowed only users with admin access
3523 */
3524static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3525{
3526	struct pmcraid_instance *pinstance;
3527
3528	if (!capable(CAP_SYS_ADMIN))
3529		return -EACCES;
3530
3531	/* Populate adapter instance * pointer for use by ioctl */
3532	pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3533	filep->private_data = pinstance;
3534
3535	return 0;
3536}
3537
3538/**
 
 
 
 
 
 
 
 
 
 
 
 
 
3539 * pmcraid_fasync - Async notifier registration from applications
3540 *
3541 * This function adds the calling process to a driver global queue. When an
3542 * event occurs, SIGIO will be sent to all processes in this queue.
3543 */
3544static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3545{
3546	struct pmcraid_instance *pinstance;
3547	int rc;
3548
3549	pinstance = filep->private_data;
3550	mutex_lock(&pinstance->aen_queue_lock);
3551	rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3552	mutex_unlock(&pinstance->aen_queue_lock);
3553
3554	return rc;
3555}
3556
3557
3558/**
3559 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3560 * commands sent over IOCTL interface
3561 *
3562 * @cmd       : pointer to struct pmcraid_cmd
3563 * @buflen    : length of the request buffer
3564 * @direction : data transfer direction
3565 *
3566 * Return value
3567 *  0 on success, non-zero error code on failure
3568 */
3569static int pmcraid_build_passthrough_ioadls(
3570	struct pmcraid_cmd *cmd,
3571	int buflen,
3572	int direction
3573)
3574{
3575	struct pmcraid_sglist *sglist = NULL;
3576	struct scatterlist *sg = NULL;
3577	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3578	struct pmcraid_ioadl_desc *ioadl;
3579	int i;
3580
3581	sglist = pmcraid_alloc_sglist(buflen);
3582
3583	if (!sglist) {
3584		pmcraid_err("can't allocate memory for passthrough SGls\n");
3585		return -ENOMEM;
3586	}
3587
3588	sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3589					sglist->scatterlist,
3590					sglist->num_sg, direction);
3591
3592	if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3593		dev_err(&cmd->drv_inst->pdev->dev,
3594			"Failed to map passthrough buffer!\n");
3595		pmcraid_free_sglist(sglist);
3596		return -EIO;
3597	}
3598
3599	cmd->sglist = sglist;
3600	ioarcb->request_flags0 |= NO_LINK_DESCS;
3601
3602	ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3603
3604	/* Initialize IOADL descriptor addresses */
3605	for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3606		ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3607		ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3608		ioadl[i].flags = 0;
3609	}
3610
3611	/* setup the last descriptor */
3612	ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3613
3614	return 0;
3615}
3616
3617
3618/**
3619 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3620 *
3621 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3622 * @buflen: size of the request buffer
3623 * @direction: data transfer direction
3624 *
3625 * Return value
3626 *  0 on success, non-zero error code on failure
3627 */
3628static void pmcraid_release_passthrough_ioadls(
3629	struct pmcraid_cmd *cmd,
3630	int buflen,
3631	int direction
3632)
3633{
3634	struct pmcraid_sglist *sglist = cmd->sglist;
3635
3636	if (buflen > 0) {
3637		pci_unmap_sg(cmd->drv_inst->pdev,
3638			     sglist->scatterlist,
3639			     sglist->num_sg,
3640			     direction);
3641		pmcraid_free_sglist(sglist);
3642		cmd->sglist = NULL;
3643	}
3644}
3645
3646/**
3647 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3648 *
3649 * @pinstance: pointer to adapter instance structure
3650 * @cmd: ioctl code
3651 * @arg: pointer to pmcraid_passthrough_buffer user buffer
3652 *
3653 * Return value
3654 *  0 on success, non-zero error code on failure
3655 */
3656static long pmcraid_ioctl_passthrough(
3657	struct pmcraid_instance *pinstance,
3658	unsigned int ioctl_cmd,
3659	unsigned int buflen,
3660	unsigned long arg
3661)
3662{
3663	struct pmcraid_passthrough_ioctl_buffer *buffer;
3664	struct pmcraid_ioarcb *ioarcb;
3665	struct pmcraid_cmd *cmd;
3666	struct pmcraid_cmd *cancel_cmd;
3667	unsigned long request_buffer;
3668	unsigned long request_offset;
3669	unsigned long lock_flags;
3670	void *ioasa;
3671	u32 ioasc;
3672	int request_size;
3673	int buffer_size;
3674	u8 access, direction;
3675	int rc = 0;
3676
3677	/* If IOA reset is in progress, wait 10 secs for reset to complete */
3678	if (pinstance->ioa_reset_in_progress) {
3679		rc = wait_event_interruptible_timeout(
3680				pinstance->reset_wait_q,
3681				!pinstance->ioa_reset_in_progress,
3682				msecs_to_jiffies(10000));
3683
3684		if (!rc)
3685			return -ETIMEDOUT;
3686		else if (rc < 0)
3687			return -ERESTARTSYS;
3688	}
3689
3690	/* If adapter is not in operational state, return error */
3691	if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3692		pmcraid_err("IOA is not operational\n");
3693		return -ENOTTY;
3694	}
3695
3696	buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3697	buffer = kmalloc(buffer_size, GFP_KERNEL);
3698
3699	if (!buffer) {
3700		pmcraid_err("no memory for passthrough buffer\n");
3701		return -ENOMEM;
3702	}
3703
3704	request_offset =
3705	    offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3706
3707	request_buffer = arg + request_offset;
3708
3709	rc = __copy_from_user(buffer,
3710			     (struct pmcraid_passthrough_ioctl_buffer *) arg,
3711			     sizeof(struct pmcraid_passthrough_ioctl_buffer));
3712
3713	ioasa =
3714	(void *)(arg +
3715		offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3716
3717	if (rc) {
3718		pmcraid_err("ioctl: can't copy passthrough buffer\n");
3719		rc = -EFAULT;
3720		goto out_free_buffer;
3721	}
3722
3723	request_size = buffer->ioarcb.data_transfer_length;
3724
3725	if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3726		access = VERIFY_READ;
3727		direction = DMA_TO_DEVICE;
3728	} else {
3729		access = VERIFY_WRITE;
3730		direction = DMA_FROM_DEVICE;
3731	}
3732
3733	if (request_size > 0) {
3734		rc = access_ok(access, arg, request_offset + request_size);
3735
3736		if (!rc) {
3737			rc = -EFAULT;
3738			goto out_free_buffer;
3739		}
3740	} else if (request_size < 0) {
3741		rc = -EINVAL;
3742		goto out_free_buffer;
3743	}
3744
3745	/* check if we have any additional command parameters */
3746	if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3747		rc = -EINVAL;
3748		goto out_free_buffer;
3749	}
3750
3751	cmd = pmcraid_get_free_cmd(pinstance);
3752
3753	if (!cmd) {
3754		pmcraid_err("free command block is not available\n");
3755		rc = -ENOMEM;
3756		goto out_free_buffer;
3757	}
3758
3759	cmd->scsi_cmd = NULL;
3760	ioarcb = &(cmd->ioa_cb->ioarcb);
3761
3762	/* Copy the user-provided IOARCB stuff field by field */
3763	ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3764	ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3765	ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3766	ioarcb->request_type = buffer->ioarcb.request_type;
3767	ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3768	ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3769	memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3770
3771	if (buffer->ioarcb.add_cmd_param_length) {
3772		ioarcb->add_cmd_param_length =
3773			buffer->ioarcb.add_cmd_param_length;
3774		ioarcb->add_cmd_param_offset =
3775			buffer->ioarcb.add_cmd_param_offset;
3776		memcpy(ioarcb->add_data.u.add_cmd_params,
3777			buffer->ioarcb.add_data.u.add_cmd_params,
3778			buffer->ioarcb.add_cmd_param_length);
3779	}
3780
3781	/* set hrrq number where the IOA should respond to. Note that all cmds
3782	 * generated internally uses hrrq_id 0, exception to this is the cmd
3783	 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3784	 * hrrq_id assigned here in queuecommand
3785	 */
3786	ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3787			  pinstance->num_hrrq;
3788
3789	if (request_size) {
3790		rc = pmcraid_build_passthrough_ioadls(cmd,
3791						      request_size,
3792						      direction);
3793		if (rc) {
3794			pmcraid_err("couldn't build passthrough ioadls\n");
3795			goto out_free_buffer;
3796		}
3797	} else if (request_size < 0) {
3798		rc = -EINVAL;
3799		goto out_free_buffer;
3800	}
3801
3802	/* If data is being written into the device, copy the data from user
3803	 * buffers
3804	 */
3805	if (direction == DMA_TO_DEVICE && request_size > 0) {
3806		rc = pmcraid_copy_sglist(cmd->sglist,
3807					 request_buffer,
3808					 request_size,
3809					 direction);
3810		if (rc) {
3811			pmcraid_err("failed to copy user buffer\n");
3812			goto out_free_sglist;
3813		}
3814	}
3815
3816	/* passthrough ioctl is a blocking command so, put the user to sleep
3817	 * until timeout. Note that a timeout value of 0 means, do timeout.
3818	 */
3819	cmd->cmd_done = pmcraid_internal_done;
3820	init_completion(&cmd->wait_for_completion);
3821	cmd->completion_req = 1;
3822
3823	pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3824		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3825		     cmd->ioa_cb->ioarcb.cdb[0],
3826		     le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3827
3828	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3829	_pmcraid_fire_command(cmd);
3830	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3831
3832	/* NOTE ! Remove the below line once abort_task is implemented
3833	 * in firmware. This line disables ioctl command timeout handling logic
3834	 * similar to IO command timeout handling, making ioctl commands to wait
3835	 * until the command completion regardless of timeout value specified in
3836	 * ioarcb
3837	 */
3838	buffer->ioarcb.cmd_timeout = 0;
3839
3840	/* If command timeout is specified put caller to wait till that time,
3841	 * otherwise it would be blocking wait. If command gets timed out, it
3842	 * will be aborted.
3843	 */
3844	if (buffer->ioarcb.cmd_timeout == 0) {
3845		wait_for_completion(&cmd->wait_for_completion);
3846	} else if (!wait_for_completion_timeout(
3847			&cmd->wait_for_completion,
3848			msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3849
3850		pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3851			le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3852			cmd->ioa_cb->ioarcb.cdb[0]);
3853
3854		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3855		cancel_cmd = pmcraid_abort_cmd(cmd);
3856		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3857
3858		if (cancel_cmd) {
3859			wait_for_completion(&cancel_cmd->wait_for_completion);
3860			ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3861			pmcraid_return_cmd(cancel_cmd);
3862
3863			/* if abort task couldn't find the command i.e it got
3864			 * completed prior to aborting, return good completion.
3865			 * if command got aborted successfully or there was IOA
3866			 * reset due to abort task itself getting timedout then
3867			 * return -ETIMEDOUT
3868			 */
3869			if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3870			    PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3871				if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3872					rc = -ETIMEDOUT;
3873				goto out_handle_response;
3874			}
3875		}
3876
3877		/* no command block for abort task or abort task failed to abort
3878		 * the IOARCB, then wait for 150 more seconds and initiate reset
3879		 * sequence after timeout
3880		 */
3881		if (!wait_for_completion_timeout(
3882			&cmd->wait_for_completion,
3883			msecs_to_jiffies(150 * 1000))) {
3884			pmcraid_reset_bringup(cmd->drv_inst);
3885			rc = -ETIMEDOUT;
3886		}
3887	}
3888
3889out_handle_response:
3890	/* copy entire IOASA buffer and return IOCTL success.
3891	 * If copying IOASA to user-buffer fails, return
3892	 * EFAULT
3893	 */
3894	if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3895		sizeof(struct pmcraid_ioasa))) {
3896		pmcraid_err("failed to copy ioasa buffer to user\n");
3897		rc = -EFAULT;
3898	}
3899
3900	/* If the data transfer was from device, copy the data onto user
3901	 * buffers
3902	 */
3903	else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3904		rc = pmcraid_copy_sglist(cmd->sglist,
3905					 request_buffer,
3906					 request_size,
3907					 direction);
3908		if (rc) {
3909			pmcraid_err("failed to copy user buffer\n");
3910			rc = -EFAULT;
3911		}
3912	}
3913
3914out_free_sglist:
3915	pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3916	pmcraid_return_cmd(cmd);
3917
3918out_free_buffer:
3919	kfree(buffer);
3920
3921	return rc;
3922}
3923
3924
3925
3926
3927/**
3928 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3929 *
3930 * @pinstance: pointer to adapter instance structure
3931 * @cmd: ioctl command passed in
3932 * @buflen: length of user_buffer
3933 * @user_buffer: user buffer pointer
3934 *
3935 * Return Value
3936 *   0 in case of success, otherwise appropriate error code
3937 */
3938static long pmcraid_ioctl_driver(
3939	struct pmcraid_instance *pinstance,
3940	unsigned int cmd,
3941	unsigned int buflen,
3942	void __user *user_buffer
3943)
3944{
3945	int rc = -ENOSYS;
3946
3947	if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
3948		pmcraid_err("ioctl_driver: access fault in request buffer\n");
3949		return -EFAULT;
3950	}
3951
3952	switch (cmd) {
3953	case PMCRAID_IOCTL_RESET_ADAPTER:
3954		pmcraid_reset_bringup(pinstance);
3955		rc = 0;
3956		break;
3957
3958	default:
3959		break;
3960	}
3961
3962	return rc;
3963}
3964
3965/**
3966 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
3967 *
3968 * @cmd: ioctl command
3969 * @arg: user buffer
3970 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
3971 *
3972 * Return Value
3973 *	negetive error code if there are access issues, otherwise zero.
3974 *	Upon success, returns ioctl header copied out of user buffer.
3975 */
3976
3977static int pmcraid_check_ioctl_buffer(
3978	int cmd,
3979	void __user *arg,
3980	struct pmcraid_ioctl_header *hdr
3981)
3982{
3983	int rc = 0;
3984	int access = VERIFY_READ;
3985
3986	if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
3987		pmcraid_err("couldn't copy ioctl header from user buffer\n");
3988		return -EFAULT;
3989	}
3990
3991	/* check for valid driver signature */
3992	rc = memcmp(hdr->signature,
3993		    PMCRAID_IOCTL_SIGNATURE,
3994		    sizeof(hdr->signature));
3995	if (rc) {
3996		pmcraid_err("signature verification failed\n");
3997		return -EINVAL;
3998	}
3999
4000	/* check for appropriate buffer access */
4001	if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4002		access = VERIFY_WRITE;
4003
4004	rc = access_ok(access,
4005		       (arg + sizeof(struct pmcraid_ioctl_header)),
4006		       hdr->buffer_length);
4007	if (!rc) {
4008		pmcraid_err("access failed for user buffer of size %d\n",
4009			     hdr->buffer_length);
4010		return -EFAULT;
4011	}
4012
4013	return 0;
4014}
4015
4016/**
4017 *  pmcraid_ioctl - char node ioctl entry point
4018 */
4019static long pmcraid_chr_ioctl(
4020	struct file *filep,
4021	unsigned int cmd,
4022	unsigned long arg
4023)
4024{
4025	struct pmcraid_instance *pinstance = NULL;
4026	struct pmcraid_ioctl_header *hdr = NULL;
4027	int retval = -ENOTTY;
4028
4029	hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
4030
4031	if (!hdr) {
4032		pmcraid_err("failed to allocate memory for ioctl header\n");
4033		return -ENOMEM;
4034	}
4035
4036	retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4037
4038	if (retval) {
4039		pmcraid_info("chr_ioctl: header check failed\n");
4040		kfree(hdr);
4041		return retval;
4042	}
4043
4044	pinstance = filep->private_data;
4045
4046	if (!pinstance) {
4047		pmcraid_info("adapter instance is not found\n");
4048		kfree(hdr);
4049		return -ENOTTY;
4050	}
4051
4052	switch (_IOC_TYPE(cmd)) {
4053
4054	case PMCRAID_PASSTHROUGH_IOCTL:
4055		/* If ioctl code is to download microcode, we need to block
4056		 * mid-layer requests.
4057		 */
4058		if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4059			scsi_block_requests(pinstance->host);
4060
4061		retval = pmcraid_ioctl_passthrough(pinstance,
4062						   cmd,
4063						   hdr->buffer_length,
4064						   arg);
4065
4066		if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4067			scsi_unblock_requests(pinstance->host);
4068		break;
4069
4070	case PMCRAID_DRIVER_IOCTL:
4071		arg += sizeof(struct pmcraid_ioctl_header);
4072		retval = pmcraid_ioctl_driver(pinstance,
4073					      cmd,
4074					      hdr->buffer_length,
4075					      (void __user *)arg);
4076		break;
4077
4078	default:
4079		retval = -ENOTTY;
4080		break;
4081	}
4082
4083	kfree(hdr);
4084
4085	return retval;
4086}
4087
4088/**
4089 * File operations structure for management interface
4090 */
4091static const struct file_operations pmcraid_fops = {
4092	.owner = THIS_MODULE,
4093	.open = pmcraid_chr_open,
 
4094	.fasync = pmcraid_chr_fasync,
4095	.unlocked_ioctl = pmcraid_chr_ioctl,
4096#ifdef CONFIG_COMPAT
4097	.compat_ioctl = pmcraid_chr_ioctl,
4098#endif
4099	.llseek = noop_llseek,
4100};
4101
4102
4103
4104
4105/**
4106 * pmcraid_show_log_level - Display adapter's error logging level
4107 * @dev: class device struct
4108 * @buf: buffer
4109 *
4110 * Return value:
4111 *  number of bytes printed to buffer
4112 */
4113static ssize_t pmcraid_show_log_level(
4114	struct device *dev,
4115	struct device_attribute *attr,
4116	char *buf)
4117{
4118	struct Scsi_Host *shost = class_to_shost(dev);
4119	struct pmcraid_instance *pinstance =
4120		(struct pmcraid_instance *)shost->hostdata;
4121	return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4122}
4123
4124/**
4125 * pmcraid_store_log_level - Change the adapter's error logging level
4126 * @dev: class device struct
4127 * @buf: buffer
4128 * @count: not used
4129 *
4130 * Return value:
4131 *  number of bytes printed to buffer
4132 */
4133static ssize_t pmcraid_store_log_level(
4134	struct device *dev,
4135	struct device_attribute *attr,
4136	const char *buf,
4137	size_t count
4138)
4139{
4140	struct Scsi_Host *shost;
4141	struct pmcraid_instance *pinstance;
4142	u8 val;
4143
4144	if (kstrtou8(buf, 10, &val))
4145		return -EINVAL;
4146	/* log-level should be from 0 to 2 */
4147	if (val > 2)
4148		return -EINVAL;
4149
4150	shost = class_to_shost(dev);
4151	pinstance = (struct pmcraid_instance *)shost->hostdata;
4152	pinstance->current_log_level = val;
4153
4154	return strlen(buf);
4155}
4156
4157static struct device_attribute pmcraid_log_level_attr = {
4158	.attr = {
4159		 .name = "log_level",
4160		 .mode = S_IRUGO | S_IWUSR,
4161		 },
4162	.show = pmcraid_show_log_level,
4163	.store = pmcraid_store_log_level,
4164};
4165
4166/**
4167 * pmcraid_show_drv_version - Display driver version
4168 * @dev: class device struct
4169 * @buf: buffer
4170 *
4171 * Return value:
4172 *  number of bytes printed to buffer
4173 */
4174static ssize_t pmcraid_show_drv_version(
4175	struct device *dev,
4176	struct device_attribute *attr,
4177	char *buf
4178)
4179{
4180	return snprintf(buf, PAGE_SIZE, "version: %s\n",
4181			PMCRAID_DRIVER_VERSION);
4182}
4183
4184static struct device_attribute pmcraid_driver_version_attr = {
4185	.attr = {
4186		 .name = "drv_version",
4187		 .mode = S_IRUGO,
4188		 },
4189	.show = pmcraid_show_drv_version,
4190};
4191
4192/**
4193 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4194 * @dev: class device struct
4195 * @buf: buffer
4196 *
4197 * Return value:
4198 *  number of bytes printed to buffer
4199 */
4200static ssize_t pmcraid_show_adapter_id(
4201	struct device *dev,
4202	struct device_attribute *attr,
4203	char *buf
4204)
4205{
4206	struct Scsi_Host *shost = class_to_shost(dev);
4207	struct pmcraid_instance *pinstance =
4208		(struct pmcraid_instance *)shost->hostdata;
4209	u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4210		pinstance->pdev->devfn;
4211	u32 aen_group = pmcraid_event_family.id;
4212
4213	return snprintf(buf, PAGE_SIZE,
4214			"adapter id: %d\nminor: %d\naen group: %d\n",
4215			adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4216}
4217
4218static struct device_attribute pmcraid_adapter_id_attr = {
4219	.attr = {
4220		 .name = "adapter_id",
4221		 .mode = S_IRUGO,
4222		 },
4223	.show = pmcraid_show_adapter_id,
4224};
4225
4226static struct device_attribute *pmcraid_host_attrs[] = {
4227	&pmcraid_log_level_attr,
4228	&pmcraid_driver_version_attr,
4229	&pmcraid_adapter_id_attr,
4230	NULL,
4231};
4232
4233
4234/* host template structure for pmcraid driver */
4235static struct scsi_host_template pmcraid_host_template = {
4236	.module = THIS_MODULE,
4237	.name = PMCRAID_DRIVER_NAME,
4238	.queuecommand = pmcraid_queuecommand,
4239	.eh_abort_handler = pmcraid_eh_abort_handler,
4240	.eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4241	.eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4242	.eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4243	.eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4244
4245	.slave_alloc = pmcraid_slave_alloc,
4246	.slave_configure = pmcraid_slave_configure,
4247	.slave_destroy = pmcraid_slave_destroy,
4248	.change_queue_depth = pmcraid_change_queue_depth,
 
4249	.can_queue = PMCRAID_MAX_IO_CMD,
4250	.this_id = -1,
4251	.sg_tablesize = PMCRAID_MAX_IOADLS,
4252	.max_sectors = PMCRAID_IOA_MAX_SECTORS,
4253	.no_write_same = 1,
4254	.cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4255	.use_clustering = ENABLE_CLUSTERING,
4256	.shost_attrs = pmcraid_host_attrs,
4257	.proc_name = PMCRAID_DRIVER_NAME,
4258};
4259
4260/*
4261 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4262 * @irq: interrupt vector number
4263 * @dev_id: pointer hrrq_vector
4264 *
4265 * Return Value
4266 *	 IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4267 */
4268
4269static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4270{
4271	struct pmcraid_isr_param *hrrq_vector;
4272	struct pmcraid_instance *pinstance;
4273	unsigned long lock_flags;
4274	u32 intrs_val;
4275	int hrrq_id;
4276
4277	hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4278	hrrq_id = hrrq_vector->hrrq_id;
4279	pinstance = hrrq_vector->drv_inst;
4280
4281	if (!hrrq_id) {
4282		/* Read the interrupt */
4283		intrs_val = pmcraid_read_interrupts(pinstance);
4284		if (intrs_val &&
4285			((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4286			& DOORBELL_INTR_MSIX_CLR) == 0)) {
4287			/* Any error interrupts including unit_check,
4288			 * initiate IOA reset.In case of unit check indicate
4289			 * to reset_sequence that IOA unit checked and prepare
4290			 * for a dump during reset sequence
4291			 */
4292			if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4293				if (intrs_val & INTRS_IOA_UNIT_CHECK)
4294					pinstance->ioa_unit_check = 1;
4295
4296				pmcraid_err("ISR: error interrupts: %x \
4297					initiating reset\n", intrs_val);
4298				spin_lock_irqsave(pinstance->host->host_lock,
4299					lock_flags);
4300				pmcraid_initiate_reset(pinstance);
4301				spin_unlock_irqrestore(
4302					pinstance->host->host_lock,
4303					lock_flags);
4304			}
4305			/* If interrupt was as part of the ioa initialization,
4306			 * clear it. Delete the timer and wakeup the
4307			 * reset engine to proceed with reset sequence
4308			 */
4309			if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4310				pmcraid_clr_trans_op(pinstance);
4311
4312			/* Clear the interrupt register by writing
4313			 * to host to ioa doorbell. Once done
4314			 * FW will clear the interrupt.
4315			 */
4316			iowrite32(DOORBELL_INTR_MSIX_CLR,
4317				pinstance->int_regs.host_ioa_interrupt_reg);
4318			ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4319
4320
4321		}
4322	}
4323
4324	tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4325
4326	return IRQ_HANDLED;
4327}
4328
4329/**
4330 * pmcraid_isr  - implements legacy interrupt handling routine
4331 *
4332 * @irq: interrupt vector number
4333 * @dev_id: pointer hrrq_vector
4334 *
4335 * Return Value
4336 *	 IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4337 */
4338static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4339{
4340	struct pmcraid_isr_param *hrrq_vector;
4341	struct pmcraid_instance *pinstance;
4342	u32 intrs;
4343	unsigned long lock_flags;
4344	int hrrq_id = 0;
4345
4346	/* In case of legacy interrupt mode where interrupts are shared across
4347	 * isrs, it may be possible that the current interrupt is not from IOA
4348	 */
4349	if (!dev_id) {
4350		printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4351		return IRQ_NONE;
4352	}
4353	hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4354	pinstance = hrrq_vector->drv_inst;
4355
4356	intrs = pmcraid_read_interrupts(pinstance);
4357
4358	if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4359		return IRQ_NONE;
4360
4361	/* Any error interrupts including unit_check, initiate IOA reset.
4362	 * In case of unit check indicate to reset_sequence that IOA unit
4363	 * checked and prepare for a dump during reset sequence
4364	 */
4365	if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4366
4367		if (intrs & INTRS_IOA_UNIT_CHECK)
4368			pinstance->ioa_unit_check = 1;
4369
4370		iowrite32(intrs,
4371			  pinstance->int_regs.ioa_host_interrupt_clr_reg);
4372		pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4373			    intrs);
4374		intrs = ioread32(
4375				pinstance->int_regs.ioa_host_interrupt_clr_reg);
4376		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4377		pmcraid_initiate_reset(pinstance);
4378		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4379	} else {
4380		/* If interrupt was as part of the ioa initialization,
4381		 * clear. Delete the timer and wakeup the
4382		 * reset engine to proceed with reset sequence
4383		 */
4384		if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4385			pmcraid_clr_trans_op(pinstance);
4386		} else {
4387			iowrite32(intrs,
4388				pinstance->int_regs.ioa_host_interrupt_clr_reg);
4389			ioread32(
4390				pinstance->int_regs.ioa_host_interrupt_clr_reg);
4391
4392			tasklet_schedule(
4393					&(pinstance->isr_tasklet[hrrq_id]));
4394		}
4395	}
4396
4397	return IRQ_HANDLED;
4398}
4399
4400
4401/**
4402 * pmcraid_worker_function -  worker thread function
4403 *
4404 * @workp: pointer to struct work queue
4405 *
4406 * Return Value
4407 *	 None
4408 */
4409
4410static void pmcraid_worker_function(struct work_struct *workp)
4411{
4412	struct pmcraid_instance *pinstance;
4413	struct pmcraid_resource_entry *res;
4414	struct pmcraid_resource_entry *temp;
4415	struct scsi_device *sdev;
4416	unsigned long lock_flags;
4417	unsigned long host_lock_flags;
4418	u16 fw_version;
4419	u8 bus, target, lun;
4420
4421	pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4422	/* add resources only after host is added into system */
4423	if (!atomic_read(&pinstance->expose_resources))
4424		return;
4425
4426	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4427
4428	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4429	list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4430
4431		if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4432			sdev = res->scsi_dev;
4433
4434			/* host_lock must be held before calling
4435			 * scsi_device_get
4436			 */
4437			spin_lock_irqsave(pinstance->host->host_lock,
4438					  host_lock_flags);
4439			if (!scsi_device_get(sdev)) {
4440				spin_unlock_irqrestore(
4441						pinstance->host->host_lock,
4442						host_lock_flags);
4443				pmcraid_info("deleting %x from midlayer\n",
4444					     res->cfg_entry.resource_address);
4445				list_move_tail(&res->queue,
4446						&pinstance->free_res_q);
4447				spin_unlock_irqrestore(
4448					&pinstance->resource_lock,
4449					lock_flags);
4450				scsi_remove_device(sdev);
4451				scsi_device_put(sdev);
4452				spin_lock_irqsave(&pinstance->resource_lock,
4453						   lock_flags);
4454				res->change_detected = 0;
4455			} else {
4456				spin_unlock_irqrestore(
4457						pinstance->host->host_lock,
4458						host_lock_flags);
4459			}
4460		}
4461	}
4462
4463	list_for_each_entry(res, &pinstance->used_res_q, queue) {
4464
4465		if (res->change_detected == RES_CHANGE_ADD) {
4466
4467			if (!pmcraid_expose_resource(fw_version,
4468						     &res->cfg_entry))
4469				continue;
4470
4471			if (RES_IS_VSET(res->cfg_entry)) {
4472				bus = PMCRAID_VSET_BUS_ID;
4473				if (fw_version <= PMCRAID_FW_VERSION_1)
4474					target = res->cfg_entry.unique_flags1;
4475				else
4476					target = res->cfg_entry.array_id & 0xFF;
4477				lun = PMCRAID_VSET_LUN_ID;
4478			} else {
4479				bus = PMCRAID_PHYS_BUS_ID;
4480				target =
4481				     RES_TARGET(
4482					res->cfg_entry.resource_address);
4483				lun = RES_LUN(res->cfg_entry.resource_address);
4484			}
4485
4486			res->change_detected = 0;
4487			spin_unlock_irqrestore(&pinstance->resource_lock,
4488						lock_flags);
4489			scsi_add_device(pinstance->host, bus, target, lun);
4490			spin_lock_irqsave(&pinstance->resource_lock,
4491					   lock_flags);
4492		}
4493	}
4494
4495	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4496}
4497
4498/**
4499 * pmcraid_tasklet_function - Tasklet function
4500 *
4501 * @instance: pointer to msix param structure
4502 *
4503 * Return Value
4504 *	None
4505 */
4506static void pmcraid_tasklet_function(unsigned long instance)
4507{
4508	struct pmcraid_isr_param *hrrq_vector;
4509	struct pmcraid_instance *pinstance;
4510	unsigned long hrrq_lock_flags;
4511	unsigned long pending_lock_flags;
4512	unsigned long host_lock_flags;
4513	spinlock_t *lockp; /* hrrq buffer lock */
4514	int id;
4515	__le32 resp;
4516
4517	hrrq_vector = (struct pmcraid_isr_param *)instance;
4518	pinstance = hrrq_vector->drv_inst;
4519	id = hrrq_vector->hrrq_id;
4520	lockp = &(pinstance->hrrq_lock[id]);
4521
4522	/* loop through each of the commands responded by IOA. Each HRRQ buf is
4523	 * protected by its own lock. Traversals must be done within this lock
4524	 * as there may be multiple tasklets running on multiple CPUs. Note
4525	 * that the lock is held just for picking up the response handle and
4526	 * manipulating hrrq_curr/toggle_bit values.
4527	 */
4528	spin_lock_irqsave(lockp, hrrq_lock_flags);
4529
4530	resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4531
4532	while ((resp & HRRQ_TOGGLE_BIT) ==
4533		pinstance->host_toggle_bit[id]) {
4534
4535		int cmd_index = resp >> 2;
4536		struct pmcraid_cmd *cmd = NULL;
4537
4538		if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4539			pinstance->hrrq_curr[id]++;
4540		} else {
4541			pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4542			pinstance->host_toggle_bit[id] ^= 1u;
4543		}
4544
4545		if (cmd_index >= PMCRAID_MAX_CMD) {
4546			/* In case of invalid response handle, log message */
4547			pmcraid_err("Invalid response handle %d\n", cmd_index);
4548			resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4549			continue;
4550		}
4551
4552		cmd = pinstance->cmd_list[cmd_index];
4553		spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4554
4555		spin_lock_irqsave(&pinstance->pending_pool_lock,
4556				   pending_lock_flags);
4557		list_del(&cmd->free_list);
4558		spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4559					pending_lock_flags);
4560		del_timer(&cmd->timer);
4561		atomic_dec(&pinstance->outstanding_cmds);
4562
4563		if (cmd->cmd_done == pmcraid_ioa_reset) {
4564			spin_lock_irqsave(pinstance->host->host_lock,
4565					  host_lock_flags);
4566			cmd->cmd_done(cmd);
4567			spin_unlock_irqrestore(pinstance->host->host_lock,
4568					       host_lock_flags);
4569		} else if (cmd->cmd_done != NULL) {
4570			cmd->cmd_done(cmd);
4571		}
4572		/* loop over until we are done with all responses */
4573		spin_lock_irqsave(lockp, hrrq_lock_flags);
4574		resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4575	}
4576
4577	spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4578}
4579
4580/**
4581 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4582 * @pinstance: pointer to adapter instance structure
4583 *
4584 * This routine un-registers registered interrupt handler and
4585 * also frees irqs/vectors.
4586 *
4587 * Retun Value
4588 *	None
4589 */
4590static
4591void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4592{
4593	int i;
4594
4595	for (i = 0; i < pinstance->num_hrrq; i++)
4596		free_irq(pinstance->hrrq_vector[i].vector,
4597			 &(pinstance->hrrq_vector[i]));
4598
4599	if (pinstance->interrupt_mode) {
4600		pci_disable_msix(pinstance->pdev);
4601		pinstance->interrupt_mode = 0;
4602	}
4603}
4604
4605/**
4606 * pmcraid_register_interrupt_handler - registers interrupt handler
4607 * @pinstance: pointer to per-adapter instance structure
4608 *
4609 * Return Value
4610 *	0 on success, non-zero error code otherwise.
4611 */
4612static int
4613pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4614{
4615	int rc;
4616	struct pci_dev *pdev = pinstance->pdev;
4617
4618	if ((pmcraid_enable_msix) &&
4619		(pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4620		int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4621		struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4622		int i;
4623		for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4624			entries[i].entry = i;
4625
4626		num_hrrq = pci_enable_msix_range(pdev, entries, 1, num_hrrq);
4627		if (num_hrrq < 0)
4628			goto pmcraid_isr_legacy;
4629
 
 
 
 
 
 
 
 
 
4630		for (i = 0; i < num_hrrq; i++) {
4631			pinstance->hrrq_vector[i].hrrq_id = i;
4632			pinstance->hrrq_vector[i].drv_inst = pinstance;
4633			pinstance->hrrq_vector[i].vector = entries[i].vector;
4634			rc = request_irq(pinstance->hrrq_vector[i].vector,
4635					pmcraid_isr_msix, 0,
4636					PMCRAID_DRIVER_NAME,
4637					&(pinstance->hrrq_vector[i]));
4638
4639			if (rc) {
4640				int j;
4641				for (j = 0; j < i; j++)
4642					free_irq(entries[j].vector,
4643						 &(pinstance->hrrq_vector[j]));
4644				pci_disable_msix(pdev);
4645				goto pmcraid_isr_legacy;
4646			}
4647		}
4648
4649		pinstance->num_hrrq = num_hrrq;
4650		pinstance->interrupt_mode = 1;
4651		iowrite32(DOORBELL_INTR_MODE_MSIX,
4652			  pinstance->int_regs.host_ioa_interrupt_reg);
4653		ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4654		goto pmcraid_isr_out;
4655	}
4656
4657pmcraid_isr_legacy:
4658	/* If MSI-X registration failed fallback to legacy mode, where
4659	 * only one hrrq entry will be used
4660	 */
4661	pinstance->hrrq_vector[0].hrrq_id = 0;
4662	pinstance->hrrq_vector[0].drv_inst = pinstance;
4663	pinstance->hrrq_vector[0].vector = pdev->irq;
4664	pinstance->num_hrrq = 1;
 
4665
4666	rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4667			 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4668pmcraid_isr_out:
4669	return rc;
4670}
4671
4672/**
4673 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4674 * @pinstance: per adapter instance structure pointer
4675 * @max_index: number of buffer blocks to release
4676 *
4677 * Return Value
4678 *  None
4679 */
4680static void
4681pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4682{
4683	int i;
4684	for (i = 0; i < max_index; i++) {
4685		kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4686		pinstance->cmd_list[i] = NULL;
4687	}
4688	kmem_cache_destroy(pinstance->cmd_cachep);
4689	pinstance->cmd_cachep = NULL;
4690}
4691
4692/**
4693 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4694 * @pinstance: pointer to per adapter instance structure
4695 * @max_index: number of buffers (from 0 onwards) to release
4696 *
4697 * This function assumes that the command blocks for which control blocks are
4698 * linked are not released.
4699 *
4700 * Return Value
4701 *	 None
4702 */
4703static void
4704pmcraid_release_control_blocks(
4705	struct pmcraid_instance *pinstance,
4706	int max_index
4707)
4708{
4709	int i;
4710
4711	if (pinstance->control_pool == NULL)
4712		return;
4713
4714	for (i = 0; i < max_index; i++) {
4715		pci_pool_free(pinstance->control_pool,
4716			      pinstance->cmd_list[i]->ioa_cb,
4717			      pinstance->cmd_list[i]->ioa_cb_bus_addr);
4718		pinstance->cmd_list[i]->ioa_cb = NULL;
4719		pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4720	}
4721	pci_pool_destroy(pinstance->control_pool);
4722	pinstance->control_pool = NULL;
4723}
4724
4725/**
4726 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4727 * @pinstance - pointer to per adapter instance structure
4728 *
4729 * Allocates memory for command blocks using kernel slab allocator.
4730 *
4731 * Return Value
4732 *	0 in case of success; -ENOMEM in case of failure
4733 */
4734static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
 
4735{
4736	int i;
4737
4738	sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4739		pinstance->host->unique_id);
4740
4741
4742	pinstance->cmd_cachep = kmem_cache_create(
4743					pinstance->cmd_pool_name,
4744					sizeof(struct pmcraid_cmd), 0,
4745					SLAB_HWCACHE_ALIGN, NULL);
4746	if (!pinstance->cmd_cachep)
4747		return -ENOMEM;
4748
4749	for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4750		pinstance->cmd_list[i] =
4751			kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4752		if (!pinstance->cmd_list[i]) {
4753			pmcraid_release_cmd_blocks(pinstance, i);
4754			return -ENOMEM;
4755		}
4756	}
4757	return 0;
4758}
4759
4760/**
4761 * pmcraid_allocate_control_blocks - allocates memory control blocks
4762 * @pinstance : pointer to per adapter instance structure
4763 *
4764 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4765 * and IOASAs. This is called after command blocks are already allocated.
4766 *
4767 * Return Value
4768 *  0 in case it can allocate all control blocks, otherwise -ENOMEM
4769 */
4770static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
 
4771{
4772	int i;
4773
4774	sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4775		pinstance->host->unique_id);
4776
4777	pinstance->control_pool =
4778		pci_pool_create(pinstance->ctl_pool_name,
4779				pinstance->pdev,
4780				sizeof(struct pmcraid_control_block),
4781				PMCRAID_IOARCB_ALIGNMENT, 0);
4782
4783	if (!pinstance->control_pool)
4784		return -ENOMEM;
4785
4786	for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4787		pinstance->cmd_list[i]->ioa_cb =
4788			pci_pool_alloc(
4789				pinstance->control_pool,
4790				GFP_KERNEL,
4791				&(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4792
4793		if (!pinstance->cmd_list[i]->ioa_cb) {
4794			pmcraid_release_control_blocks(pinstance, i);
4795			return -ENOMEM;
4796		}
4797		memset(pinstance->cmd_list[i]->ioa_cb, 0,
4798			sizeof(struct pmcraid_control_block));
4799	}
4800	return 0;
4801}
4802
4803/**
4804 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4805 * @pinstance: pointer to per adapter instance structure
4806 * @maxindex: size of hrrq buffer pointer array
4807 *
4808 * Return Value
4809 *	None
4810 */
4811static void
4812pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4813{
4814	int i;
4815	for (i = 0; i < maxindex; i++) {
4816
4817		pci_free_consistent(pinstance->pdev,
4818				    HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4819				    pinstance->hrrq_start[i],
4820				    pinstance->hrrq_start_bus_addr[i]);
4821
4822		/* reset pointers and toggle bit to zeros */
4823		pinstance->hrrq_start[i] = NULL;
4824		pinstance->hrrq_start_bus_addr[i] = 0;
4825		pinstance->host_toggle_bit[i] = 0;
4826	}
4827}
4828
4829/**
4830 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4831 * @pinstance: pointer to per adapter instance structure
4832 *
4833 * Return value
4834 *	0 hrrq buffers are allocated, -ENOMEM otherwise.
4835 */
4836static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
 
4837{
4838	int i, buffer_size;
4839
4840	buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4841
4842	for (i = 0; i < pinstance->num_hrrq; i++) {
4843		pinstance->hrrq_start[i] =
4844			pci_alloc_consistent(
4845					pinstance->pdev,
4846					buffer_size,
4847					&(pinstance->hrrq_start_bus_addr[i]));
4848
4849		if (pinstance->hrrq_start[i] == 0) {
4850			pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4851				    i);
4852			pmcraid_release_host_rrqs(pinstance, i);
4853			return -ENOMEM;
4854		}
4855
4856		memset(pinstance->hrrq_start[i], 0, buffer_size);
4857		pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4858		pinstance->hrrq_end[i] =
4859			pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4860		pinstance->host_toggle_bit[i] = 1;
4861		spin_lock_init(&pinstance->hrrq_lock[i]);
4862	}
4863	return 0;
4864}
4865
4866/**
4867 * pmcraid_release_hcams - release HCAM buffers
4868 *
4869 * @pinstance: pointer to per adapter instance structure
4870 *
4871 * Return value
4872 *  none
4873 */
4874static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4875{
4876	if (pinstance->ccn.msg != NULL) {
4877		pci_free_consistent(pinstance->pdev,
4878				    PMCRAID_AEN_HDR_SIZE +
4879				    sizeof(struct pmcraid_hcam_ccn_ext),
4880				    pinstance->ccn.msg,
4881				    pinstance->ccn.baddr);
4882
4883		pinstance->ccn.msg = NULL;
4884		pinstance->ccn.hcam = NULL;
4885		pinstance->ccn.baddr = 0;
4886	}
4887
4888	if (pinstance->ldn.msg != NULL) {
4889		pci_free_consistent(pinstance->pdev,
4890				    PMCRAID_AEN_HDR_SIZE +
4891				    sizeof(struct pmcraid_hcam_ldn),
4892				    pinstance->ldn.msg,
4893				    pinstance->ldn.baddr);
4894
4895		pinstance->ldn.msg = NULL;
4896		pinstance->ldn.hcam = NULL;
4897		pinstance->ldn.baddr = 0;
4898	}
4899}
4900
4901/**
4902 * pmcraid_allocate_hcams - allocates HCAM buffers
4903 * @pinstance : pointer to per adapter instance structure
4904 *
4905 * Return Value:
4906 *   0 in case of successful allocation, non-zero otherwise
4907 */
4908static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4909{
4910	pinstance->ccn.msg = pci_alloc_consistent(
4911					pinstance->pdev,
4912					PMCRAID_AEN_HDR_SIZE +
4913					sizeof(struct pmcraid_hcam_ccn_ext),
4914					&(pinstance->ccn.baddr));
4915
4916	pinstance->ldn.msg = pci_alloc_consistent(
4917					pinstance->pdev,
4918					PMCRAID_AEN_HDR_SIZE +
4919					sizeof(struct pmcraid_hcam_ldn),
4920					&(pinstance->ldn.baddr));
4921
4922	if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4923		pmcraid_release_hcams(pinstance);
4924	} else {
4925		pinstance->ccn.hcam =
4926			(void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
4927		pinstance->ldn.hcam =
4928			(void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
4929
4930		atomic_set(&pinstance->ccn.ignore, 0);
4931		atomic_set(&pinstance->ldn.ignore, 0);
4932	}
4933
4934	return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
4935}
4936
4937/**
4938 * pmcraid_release_config_buffers - release config.table buffers
4939 * @pinstance: pointer to per adapter instance structure
4940 *
4941 * Return Value
4942 *	 none
4943 */
4944static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
4945{
4946	if (pinstance->cfg_table != NULL &&
4947	    pinstance->cfg_table_bus_addr != 0) {
4948		pci_free_consistent(pinstance->pdev,
4949				    sizeof(struct pmcraid_config_table),
4950				    pinstance->cfg_table,
4951				    pinstance->cfg_table_bus_addr);
4952		pinstance->cfg_table = NULL;
4953		pinstance->cfg_table_bus_addr = 0;
4954	}
4955
4956	if (pinstance->res_entries != NULL) {
4957		int i;
4958
4959		for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4960			list_del(&pinstance->res_entries[i].queue);
4961		kfree(pinstance->res_entries);
4962		pinstance->res_entries = NULL;
4963	}
4964
4965	pmcraid_release_hcams(pinstance);
4966}
4967
4968/**
4969 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
4970 * @pinstance : pointer to per adapter instance structure
4971 *
4972 * Return Value
4973 *	0 for successful allocation, -ENOMEM for any failure
4974 */
4975static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
 
4976{
4977	int i;
4978
4979	pinstance->res_entries =
4980			kzalloc(sizeof(struct pmcraid_resource_entry) *
4981				PMCRAID_MAX_RESOURCES, GFP_KERNEL);
4982
4983	if (NULL == pinstance->res_entries) {
4984		pmcraid_err("failed to allocate memory for resource table\n");
4985		return -ENOMEM;
4986	}
4987
4988	for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4989		list_add_tail(&pinstance->res_entries[i].queue,
4990			      &pinstance->free_res_q);
4991
4992	pinstance->cfg_table =
4993		pci_alloc_consistent(pinstance->pdev,
4994				     sizeof(struct pmcraid_config_table),
4995				     &pinstance->cfg_table_bus_addr);
4996
4997	if (NULL == pinstance->cfg_table) {
4998		pmcraid_err("couldn't alloc DMA memory for config table\n");
4999		pmcraid_release_config_buffers(pinstance);
5000		return -ENOMEM;
5001	}
5002
5003	if (pmcraid_allocate_hcams(pinstance)) {
5004		pmcraid_err("could not alloc DMA memory for HCAMS\n");
5005		pmcraid_release_config_buffers(pinstance);
5006		return -ENOMEM;
5007	}
5008
5009	return 0;
5010}
5011
5012/**
5013 * pmcraid_init_tasklets - registers tasklets for response handling
5014 *
5015 * @pinstance: pointer adapter instance structure
5016 *
5017 * Return value
5018 *	none
5019 */
5020static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5021{
5022	int i;
5023	for (i = 0; i < pinstance->num_hrrq; i++)
5024		tasklet_init(&pinstance->isr_tasklet[i],
5025			     pmcraid_tasklet_function,
5026			     (unsigned long)&pinstance->hrrq_vector[i]);
5027}
5028
5029/**
5030 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5031 *
5032 * @pinstance: pointer to adapter instance structure
5033 *
5034 * Return value
5035 *	none
5036 */
5037static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5038{
5039	int i;
5040	for (i = 0; i < pinstance->num_hrrq; i++)
5041		tasklet_kill(&pinstance->isr_tasklet[i]);
5042}
5043
5044/**
5045 * pmcraid_release_buffers - release per-adapter buffers allocated
5046 *
5047 * @pinstance: pointer to adapter soft state
5048 *
5049 * Return Value
5050 *	none
5051 */
5052static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5053{
5054	pmcraid_release_config_buffers(pinstance);
5055	pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5056	pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5057	pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5058
5059	if (pinstance->inq_data != NULL) {
5060		pci_free_consistent(pinstance->pdev,
5061				    sizeof(struct pmcraid_inquiry_data),
5062				    pinstance->inq_data,
5063				    pinstance->inq_data_baddr);
5064
5065		pinstance->inq_data = NULL;
5066		pinstance->inq_data_baddr = 0;
5067	}
5068
5069	if (pinstance->timestamp_data != NULL) {
5070		pci_free_consistent(pinstance->pdev,
5071				    sizeof(struct pmcraid_timestamp_data),
5072				    pinstance->timestamp_data,
5073				    pinstance->timestamp_data_baddr);
5074
5075		pinstance->timestamp_data = NULL;
5076		pinstance->timestamp_data_baddr = 0;
5077	}
5078}
5079
5080/**
5081 * pmcraid_init_buffers - allocates memory and initializes various structures
5082 * @pinstance: pointer to per adapter instance structure
5083 *
5084 * This routine pre-allocates memory based on the type of block as below:
5085 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5086 * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
5087 * config-table entries      : DMAable memory using pci_alloc_consistent
5088 * HostRRQs                  : DMAable memory, using pci_alloc_consistent
5089 *
5090 * Return Value
5091 *	 0 in case all of the blocks are allocated, -ENOMEM otherwise.
5092 */
5093static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5094{
5095	int i;
5096
5097	if (pmcraid_allocate_host_rrqs(pinstance)) {
5098		pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5099			     pinstance->num_hrrq);
5100		return -ENOMEM;
5101	}
5102
5103	if (pmcraid_allocate_config_buffers(pinstance)) {
5104		pmcraid_err("couldn't allocate memory for config buffers\n");
5105		pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5106		return -ENOMEM;
5107	}
5108
5109	if (pmcraid_allocate_cmd_blocks(pinstance)) {
5110		pmcraid_err("couldn't allocate memory for cmd blocks\n");
5111		pmcraid_release_config_buffers(pinstance);
5112		pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5113		return -ENOMEM;
5114	}
5115
5116	if (pmcraid_allocate_control_blocks(pinstance)) {
5117		pmcraid_err("couldn't allocate memory control blocks\n");
5118		pmcraid_release_config_buffers(pinstance);
5119		pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5120		pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5121		return -ENOMEM;
5122	}
5123
5124	/* allocate DMAable memory for page D0 INQUIRY buffer */
5125	pinstance->inq_data = pci_alloc_consistent(
5126					pinstance->pdev,
5127					sizeof(struct pmcraid_inquiry_data),
5128					&pinstance->inq_data_baddr);
5129
5130	if (pinstance->inq_data == NULL) {
5131		pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5132		pmcraid_release_buffers(pinstance);
5133		return -ENOMEM;
5134	}
5135
5136	/* allocate DMAable memory for set timestamp data buffer */
5137	pinstance->timestamp_data = pci_alloc_consistent(
5138					pinstance->pdev,
5139					sizeof(struct pmcraid_timestamp_data),
5140					&pinstance->timestamp_data_baddr);
5141
5142	if (pinstance->timestamp_data == NULL) {
5143		pmcraid_err("couldn't allocate DMA memory for \
5144				set time_stamp \n");
5145		pmcraid_release_buffers(pinstance);
5146		return -ENOMEM;
5147	}
5148
5149
5150	/* Initialize all the command blocks and add them to free pool. No
5151	 * need to lock (free_pool_lock) as this is done in initialization
5152	 * itself
5153	 */
5154	for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5155		struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5156		pmcraid_init_cmdblk(cmdp, i);
5157		cmdp->drv_inst = pinstance;
5158		list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5159	}
5160
5161	return 0;
5162}
5163
5164/**
5165 * pmcraid_reinit_buffers - resets various buffer pointers
5166 * @pinstance: pointer to adapter instance
5167 * Return value
5168 *	none
5169 */
5170static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5171{
5172	int i;
5173	int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5174
5175	for (i = 0; i < pinstance->num_hrrq; i++) {
5176		memset(pinstance->hrrq_start[i], 0, buffer_size);
5177		pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5178		pinstance->hrrq_end[i] =
5179			pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5180		pinstance->host_toggle_bit[i] = 1;
5181	}
5182}
5183
5184/**
5185 * pmcraid_init_instance - initialize per instance data structure
5186 * @pdev: pointer to pci device structure
5187 * @host: pointer to Scsi_Host structure
5188 * @mapped_pci_addr: memory mapped IOA configuration registers
5189 *
5190 * Return Value
5191 *	 0 on success, non-zero in case of any failure
5192 */
5193static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
5194				 void __iomem *mapped_pci_addr)
 
 
 
5195{
5196	struct pmcraid_instance *pinstance =
5197		(struct pmcraid_instance *)host->hostdata;
5198
5199	pinstance->host = host;
5200	pinstance->pdev = pdev;
5201
5202	/* Initialize register addresses */
5203	pinstance->mapped_dma_addr = mapped_pci_addr;
5204
5205	/* Initialize chip-specific details */
5206	{
5207		struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5208		struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5209
5210		pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5211
5212		pint_regs->ioa_host_interrupt_reg =
5213			mapped_pci_addr + chip_cfg->ioa_host_intr;
5214		pint_regs->ioa_host_interrupt_clr_reg =
5215			mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5216		pint_regs->ioa_host_msix_interrupt_reg =
5217			mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5218		pint_regs->host_ioa_interrupt_reg =
5219			mapped_pci_addr + chip_cfg->host_ioa_intr;
5220		pint_regs->host_ioa_interrupt_clr_reg =
5221			mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5222
5223		/* Current version of firmware exposes interrupt mask set
5224		 * and mask clr registers through memory mapped bar0.
5225		 */
5226		pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5227		pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5228		pint_regs->ioa_host_interrupt_mask_reg =
5229			mapped_pci_addr + chip_cfg->ioa_host_mask;
5230		pint_regs->ioa_host_interrupt_mask_clr_reg =
5231			mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5232		pint_regs->global_interrupt_mask_reg =
5233			mapped_pci_addr + chip_cfg->global_intr_mask;
5234	};
5235
5236	pinstance->ioa_reset_attempts = 0;
5237	init_waitqueue_head(&pinstance->reset_wait_q);
5238
5239	atomic_set(&pinstance->outstanding_cmds, 0);
5240	atomic_set(&pinstance->last_message_id, 0);
5241	atomic_set(&pinstance->expose_resources, 0);
5242
5243	INIT_LIST_HEAD(&pinstance->free_res_q);
5244	INIT_LIST_HEAD(&pinstance->used_res_q);
5245	INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5246	INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5247
5248	spin_lock_init(&pinstance->free_pool_lock);
5249	spin_lock_init(&pinstance->pending_pool_lock);
5250	spin_lock_init(&pinstance->resource_lock);
5251	mutex_init(&pinstance->aen_queue_lock);
5252
5253	/* Work-queue (Shared) for deferred processing error handling */
5254	INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5255
5256	/* Initialize the default log_level */
5257	pinstance->current_log_level = pmcraid_log_level;
5258
5259	/* Setup variables required for reset engine */
5260	pinstance->ioa_state = IOA_STATE_UNKNOWN;
5261	pinstance->reset_cmd = NULL;
5262	return 0;
5263}
5264
5265/**
5266 * pmcraid_shutdown - shutdown adapter controller.
5267 * @pdev: pci device struct
5268 *
5269 * Issues an adapter shutdown to the card waits for its completion
5270 *
5271 * Return value
5272 *	  none
5273 */
5274static void pmcraid_shutdown(struct pci_dev *pdev)
5275{
5276	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5277	pmcraid_reset_bringdown(pinstance);
5278}
5279
5280
5281/**
5282 * pmcraid_get_minor - returns unused minor number from minor number bitmap
5283 */
5284static unsigned short pmcraid_get_minor(void)
5285{
5286	int minor;
5287
5288	minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5289	__set_bit(minor, pmcraid_minor);
5290	return minor;
5291}
5292
5293/**
5294 * pmcraid_release_minor - releases given minor back to minor number bitmap
5295 */
5296static void pmcraid_release_minor(unsigned short minor)
5297{
5298	__clear_bit(minor, pmcraid_minor);
5299}
5300
5301/**
5302 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5303 *
5304 * @pinstance: pointer to adapter instance for which to register device
5305 *
5306 * Return value
5307 *	0 in case of success, otherwise non-zero
5308 */
5309static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5310{
5311	int minor;
5312	int error;
5313
5314	minor = pmcraid_get_minor();
5315	cdev_init(&pinstance->cdev, &pmcraid_fops);
5316	pinstance->cdev.owner = THIS_MODULE;
5317
5318	error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5319
5320	if (error)
5321		pmcraid_release_minor(minor);
5322	else
5323		device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5324			      NULL, "%s%u", PMCRAID_DEVFILE, minor);
5325	return error;
5326}
5327
5328/**
5329 * pmcraid_release_chrdev - unregisters per-adapter management interface
5330 *
5331 * @pinstance: pointer to adapter instance structure
5332 *
5333 * Return value
5334 *  none
5335 */
5336static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5337{
5338	pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5339	device_destroy(pmcraid_class,
5340		       MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5341	cdev_del(&pinstance->cdev);
5342}
5343
5344/**
5345 * pmcraid_remove - IOA hot plug remove entry point
5346 * @pdev: pci device struct
5347 *
5348 * Return value
5349 *	  none
5350 */
5351static void pmcraid_remove(struct pci_dev *pdev)
5352{
5353	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5354
5355	/* remove the management interface (/dev file) for this device */
5356	pmcraid_release_chrdev(pinstance);
5357
5358	/* remove host template from scsi midlayer */
5359	scsi_remove_host(pinstance->host);
5360
5361	/* block requests from mid-layer */
5362	scsi_block_requests(pinstance->host);
5363
5364	/* initiate shutdown adapter */
5365	pmcraid_shutdown(pdev);
5366
5367	pmcraid_disable_interrupts(pinstance, ~0);
5368	flush_work(&pinstance->worker_q);
5369
5370	pmcraid_kill_tasklets(pinstance);
5371	pmcraid_unregister_interrupt_handler(pinstance);
5372	pmcraid_release_buffers(pinstance);
5373	iounmap(pinstance->mapped_dma_addr);
5374	pci_release_regions(pdev);
5375	scsi_host_put(pinstance->host);
5376	pci_disable_device(pdev);
5377
5378	return;
5379}
5380
5381#ifdef CONFIG_PM
5382/**
5383 * pmcraid_suspend - driver suspend entry point for power management
5384 * @pdev:   PCI device structure
5385 * @state:  PCI power state to suspend routine
5386 *
5387 * Return Value - 0 always
5388 */
5389static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5390{
5391	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5392
5393	pmcraid_shutdown(pdev);
5394	pmcraid_disable_interrupts(pinstance, ~0);
5395	pmcraid_kill_tasklets(pinstance);
5396	pci_set_drvdata(pinstance->pdev, pinstance);
5397	pmcraid_unregister_interrupt_handler(pinstance);
5398	pci_save_state(pdev);
5399	pci_disable_device(pdev);
5400	pci_set_power_state(pdev, pci_choose_state(pdev, state));
5401
5402	return 0;
5403}
5404
5405/**
5406 * pmcraid_resume - driver resume entry point PCI power management
5407 * @pdev: PCI device structure
5408 *
5409 * Return Value - 0 in case of success. Error code in case of any failure
5410 */
5411static int pmcraid_resume(struct pci_dev *pdev)
5412{
5413	struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5414	struct Scsi_Host *host = pinstance->host;
5415	int rc;
5416
5417	pci_set_power_state(pdev, PCI_D0);
5418	pci_enable_wake(pdev, PCI_D0, 0);
5419	pci_restore_state(pdev);
5420
5421	rc = pci_enable_device(pdev);
5422
5423	if (rc) {
5424		dev_err(&pdev->dev, "resume: Enable device failed\n");
5425		return rc;
5426	}
5427
5428	pci_set_master(pdev);
5429
5430	if ((sizeof(dma_addr_t) == 4) ||
5431	     pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5432		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5433
5434	if (rc == 0)
5435		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5436
5437	if (rc != 0) {
5438		dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5439		goto disable_device;
5440	}
5441
5442	pmcraid_disable_interrupts(pinstance, ~0);
5443	atomic_set(&pinstance->outstanding_cmds, 0);
5444	rc = pmcraid_register_interrupt_handler(pinstance);
5445
5446	if (rc) {
5447		dev_err(&pdev->dev,
5448			"resume: couldn't register interrupt handlers\n");
5449		rc = -ENODEV;
5450		goto release_host;
5451	}
5452
5453	pmcraid_init_tasklets(pinstance);
5454	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5455
5456	/* Start with hard reset sequence which brings up IOA to operational
5457	 * state as well as completes the reset sequence.
5458	 */
5459	pinstance->ioa_hard_reset = 1;
5460
5461	/* Start IOA firmware initialization and bring card to Operational
5462	 * state.
5463	 */
5464	if (pmcraid_reset_bringup(pinstance)) {
5465		dev_err(&pdev->dev, "couldn't initialize IOA\n");
5466		rc = -ENODEV;
5467		goto release_tasklets;
5468	}
5469
5470	return 0;
5471
5472release_tasklets:
5473	pmcraid_disable_interrupts(pinstance, ~0);
5474	pmcraid_kill_tasklets(pinstance);
5475	pmcraid_unregister_interrupt_handler(pinstance);
5476
5477release_host:
5478	scsi_host_put(host);
5479
5480disable_device:
5481	pci_disable_device(pdev);
5482
5483	return rc;
5484}
5485
5486#else
5487
5488#define pmcraid_suspend NULL
5489#define pmcraid_resume  NULL
5490
5491#endif /* CONFIG_PM */
5492
5493/**
5494 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5495 *				completion of the ioa reset
5496 * @cmd: pointer to reset command block
5497 */
5498static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5499{
5500	struct pmcraid_instance *pinstance = cmd->drv_inst;
5501	unsigned long flags;
5502
5503	spin_lock_irqsave(pinstance->host->host_lock, flags);
5504	pmcraid_ioa_reset(cmd);
5505	spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5506	scsi_unblock_requests(pinstance->host);
5507	schedule_work(&pinstance->worker_q);
5508}
5509
5510/**
5511 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5512 *
5513 * @cmd: pointer to pmcraid_cmd structure
5514 *
5515 * Return Value
5516 *  0 for success or non-zero for failure cases
5517 */
5518static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5519{
5520	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5521	void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5522
5523	pmcraid_reinit_cmdblk(cmd);
5524
5525	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5526	ioarcb->request_type = REQ_TYPE_IOACMD;
5527	ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5528	ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5529
5530	/* If this was called as part of resource table reinitialization due to
5531	 * lost CCN, it is enough to return the command block back to free pool
5532	 * as part of set_supported_devs completion function.
5533	 */
5534	if (cmd->drv_inst->reinit_cfg_table) {
5535		cmd->drv_inst->reinit_cfg_table = 0;
5536		cmd->release = 1;
5537		cmd_done = pmcraid_reinit_cfgtable_done;
5538	}
5539
5540	/* we will be done with the reset sequence after set supported devices,
5541	 * setup the done function to return the command block back to free
5542	 * pool
5543	 */
5544	pmcraid_send_cmd(cmd,
5545			 cmd_done,
5546			 PMCRAID_SET_SUP_DEV_TIMEOUT,
5547			 pmcraid_timeout_handler);
5548	return;
5549}
5550
5551/**
5552 * pmcraid_set_timestamp - set the timestamp to IOAFP
5553 *
5554 * @cmd: pointer to pmcraid_cmd structure
5555 *
5556 * Return Value
5557 *  0 for success or non-zero for failure cases
5558 */
5559static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5560{
5561	struct pmcraid_instance *pinstance = cmd->drv_inst;
5562	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5563	__be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5564	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5565
 
5566	__le64 timestamp;
5567
5568	timestamp = ktime_get_real_seconds() * 1000;
 
5569
5570	pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5571	pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5572	pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5573	pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5574	pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5575	pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
5576
5577	pmcraid_reinit_cmdblk(cmd);
5578	ioarcb->request_type = REQ_TYPE_SCSI;
5579	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5580	ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5581	ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5582	memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5583
5584	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5585					offsetof(struct pmcraid_ioarcb,
5586						add_data.u.ioadl[0]));
5587	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5588	ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5589
5590	ioarcb->request_flags0 |= NO_LINK_DESCS;
5591	ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5592	ioarcb->data_transfer_length =
5593		cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5594	ioadl = &(ioarcb->add_data.u.ioadl[0]);
5595	ioadl->flags = IOADL_FLAGS_LAST_DESC;
5596	ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5597	ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5598
5599	if (!pinstance->timestamp_error) {
5600		pinstance->timestamp_error = 0;
5601		pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5602			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5603	} else {
5604		pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5605			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5606		return;
5607	}
5608}
5609
5610
5611/**
5612 * pmcraid_init_res_table - Initialize the resource table
5613 * @cmd:  pointer to pmcraid command struct
5614 *
5615 * This function looks through the existing resource table, comparing
5616 * it with the config table. This function will take care of old/new
5617 * devices and schedule adding/removing them from the mid-layer
5618 * as appropriate.
5619 *
5620 * Return value
5621 *	 None
5622 */
5623static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5624{
5625	struct pmcraid_instance *pinstance = cmd->drv_inst;
5626	struct pmcraid_resource_entry *res, *temp;
5627	struct pmcraid_config_table_entry *cfgte;
5628	unsigned long lock_flags;
5629	int found, rc, i;
5630	u16 fw_version;
5631	LIST_HEAD(old_res);
5632
5633	if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5634		pmcraid_err("IOA requires microcode download\n");
5635
5636	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5637
5638	/* resource list is protected by pinstance->resource_lock.
5639	 * init_res_table can be called from probe (user-thread) or runtime
5640	 * reset (timer/tasklet)
5641	 */
5642	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5643
5644	list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5645		list_move_tail(&res->queue, &old_res);
5646
5647	for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5648		if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5649						PMCRAID_FW_VERSION_1)
5650			cfgte = &pinstance->cfg_table->entries[i];
5651		else
5652			cfgte = (struct pmcraid_config_table_entry *)
5653					&pinstance->cfg_table->entries_ext[i];
5654
5655		if (!pmcraid_expose_resource(fw_version, cfgte))
5656			continue;
5657
5658		found = 0;
5659
5660		/* If this entry was already detected and initialized */
5661		list_for_each_entry_safe(res, temp, &old_res, queue) {
5662
5663			rc = memcmp(&res->cfg_entry.resource_address,
5664				    &cfgte->resource_address,
5665				    sizeof(cfgte->resource_address));
5666			if (!rc) {
5667				list_move_tail(&res->queue,
5668						&pinstance->used_res_q);
5669				found = 1;
5670				break;
5671			}
5672		}
5673
5674		/* If this is new entry, initialize it and add it the queue */
5675		if (!found) {
5676
5677			if (list_empty(&pinstance->free_res_q)) {
5678				pmcraid_err("Too many devices attached\n");
5679				break;
5680			}
5681
5682			found = 1;
5683			res = list_entry(pinstance->free_res_q.next,
5684					 struct pmcraid_resource_entry, queue);
5685
5686			res->scsi_dev = NULL;
5687			res->change_detected = RES_CHANGE_ADD;
5688			res->reset_progress = 0;
5689			list_move_tail(&res->queue, &pinstance->used_res_q);
5690		}
5691
5692		/* copy new configuration table entry details into driver
5693		 * maintained resource entry
5694		 */
5695		if (found) {
5696			memcpy(&res->cfg_entry, cfgte,
5697					pinstance->config_table_entry_size);
5698			pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5699				 res->cfg_entry.resource_type,
5700				 (fw_version <= PMCRAID_FW_VERSION_1 ?
5701					res->cfg_entry.unique_flags1 :
5702						res->cfg_entry.array_id & 0xFF),
5703				 le32_to_cpu(res->cfg_entry.resource_address));
5704		}
5705	}
5706
5707	/* Detect any deleted entries, mark them for deletion from mid-layer */
5708	list_for_each_entry_safe(res, temp, &old_res, queue) {
5709
5710		if (res->scsi_dev) {
5711			res->change_detected = RES_CHANGE_DEL;
5712			res->cfg_entry.resource_handle =
5713				PMCRAID_INVALID_RES_HANDLE;
5714			list_move_tail(&res->queue, &pinstance->used_res_q);
5715		} else {
5716			list_move_tail(&res->queue, &pinstance->free_res_q);
5717		}
5718	}
5719
5720	/* release the resource list lock */
5721	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5722	pmcraid_set_timestamp(cmd);
5723}
5724
5725/**
5726 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5727 * @cmd: pointer pmcraid_cmd struct
5728 *
5729 * This function sends a Query IOA Configuration command to the adapter to
5730 * retrieve the IOA configuration table.
5731 *
5732 * Return value:
5733 *	none
5734 */
5735static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5736{
5737	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5738	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5739	struct pmcraid_instance *pinstance = cmd->drv_inst;
5740	int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5741
5742	if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5743					PMCRAID_FW_VERSION_1)
5744		pinstance->config_table_entry_size =
5745			sizeof(struct pmcraid_config_table_entry);
5746	else
5747		pinstance->config_table_entry_size =
5748			sizeof(struct pmcraid_config_table_entry_ext);
5749
5750	ioarcb->request_type = REQ_TYPE_IOACMD;
5751	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5752
5753	ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5754
5755	/* firmware requires 4-byte length field, specified in B.E format */
5756	memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5757
5758	/* Since entire config table can be described by single IOADL, it can
5759	 * be part of IOARCB itself
5760	 */
5761	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5762					offsetof(struct pmcraid_ioarcb,
5763						add_data.u.ioadl[0]));
5764	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5765	ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5766
5767	ioarcb->request_flags0 |= NO_LINK_DESCS;
5768	ioarcb->data_transfer_length =
5769		cpu_to_le32(sizeof(struct pmcraid_config_table));
5770
5771	ioadl = &(ioarcb->add_data.u.ioadl[0]);
5772	ioadl->flags = IOADL_FLAGS_LAST_DESC;
5773	ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5774	ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5775
5776	pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5777			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5778}
5779
5780
5781/**
5782 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5783 * @pdev: pointer to pci device structure
5784 * @dev_id: pointer to device ids structure
5785 *
5786 * Return Value
5787 *	returns 0 if the device is claimed and successfully configured.
5788 *	returns non-zero error code in case of any failure
5789 */
5790static int pmcraid_probe(struct pci_dev *pdev,
5791			 const struct pci_device_id *dev_id)
 
 
5792{
5793	struct pmcraid_instance *pinstance;
5794	struct Scsi_Host *host;
5795	void __iomem *mapped_pci_addr;
5796	int rc = PCIBIOS_SUCCESSFUL;
5797
5798	if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5799		pmcraid_err
5800			("maximum number(%d) of supported adapters reached\n",
5801			 atomic_read(&pmcraid_adapter_count));
5802		return -ENOMEM;
5803	}
5804
5805	atomic_inc(&pmcraid_adapter_count);
5806	rc = pci_enable_device(pdev);
5807
5808	if (rc) {
5809		dev_err(&pdev->dev, "Cannot enable adapter\n");
5810		atomic_dec(&pmcraid_adapter_count);
5811		return rc;
5812	}
5813
5814	dev_info(&pdev->dev,
5815		"Found new IOA(%x:%x), Total IOA count: %d\n",
5816		 pdev->vendor, pdev->device,
5817		 atomic_read(&pmcraid_adapter_count));
5818
5819	rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5820
5821	if (rc < 0) {
5822		dev_err(&pdev->dev,
5823			"Couldn't register memory range of registers\n");
5824		goto out_disable_device;
5825	}
5826
5827	mapped_pci_addr = pci_iomap(pdev, 0, 0);
5828
5829	if (!mapped_pci_addr) {
5830		dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5831		rc = -ENOMEM;
5832		goto out_release_regions;
5833	}
5834
5835	pci_set_master(pdev);
5836
5837	/* Firmware requires the system bus address of IOARCB to be within
5838	 * 32-bit addressable range though it has 64-bit IOARRIN register.
5839	 * However, firmware supports 64-bit streaming DMA buffers, whereas
5840	 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5841	 * returns memory within 4GB (if not, change this logic), coherent
5842	 * buffers are within firmware acceptable address ranges.
5843	 */
5844	if ((sizeof(dma_addr_t) == 4) ||
5845	    pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5846		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5847
5848	/* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5849	 * bit mask for pci_alloc_consistent to return addresses within 4GB
5850	 */
5851	if (rc == 0)
5852		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5853
5854	if (rc != 0) {
5855		dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5856		goto cleanup_nomem;
5857	}
5858
5859	host = scsi_host_alloc(&pmcraid_host_template,
5860				sizeof(struct pmcraid_instance));
5861
5862	if (!host) {
5863		dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5864		rc = -ENOMEM;
5865		goto cleanup_nomem;
5866	}
5867
5868	host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5869	host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5870	host->unique_id = host->host_no;
5871	host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5872	host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5873
5874	/* zero out entire instance structure */
5875	pinstance = (struct pmcraid_instance *)host->hostdata;
5876	memset(pinstance, 0, sizeof(*pinstance));
5877
5878	pinstance->chip_cfg =
5879		(struct pmcraid_chip_details *)(dev_id->driver_data);
5880
5881	rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5882
5883	if (rc < 0) {
5884		dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5885		goto out_scsi_host_put;
5886	}
5887
5888	pci_set_drvdata(pdev, pinstance);
5889
5890	/* Save PCI config-space for use following the reset */
5891	rc = pci_save_state(pinstance->pdev);
5892
5893	if (rc != 0) {
5894		dev_err(&pdev->dev, "Failed to save PCI config space\n");
5895		goto out_scsi_host_put;
5896	}
5897
5898	pmcraid_disable_interrupts(pinstance, ~0);
5899
5900	rc = pmcraid_register_interrupt_handler(pinstance);
5901
5902	if (rc) {
5903		dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5904		goto out_scsi_host_put;
5905	}
5906
5907	pmcraid_init_tasklets(pinstance);
5908
5909	/* allocate verious buffers used by LLD.*/
5910	rc = pmcraid_init_buffers(pinstance);
5911
5912	if (rc) {
5913		pmcraid_err("couldn't allocate memory blocks\n");
5914		goto out_unregister_isr;
5915	}
5916
5917	/* check the reset type required */
5918	pmcraid_reset_type(pinstance);
5919
5920	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5921
5922	/* Start IOA firmware initialization and bring card to Operational
5923	 * state.
5924	 */
5925	pmcraid_info("starting IOA initialization sequence\n");
5926	if (pmcraid_reset_bringup(pinstance)) {
5927		dev_err(&pdev->dev, "couldn't initialize IOA\n");
5928		rc = 1;
5929		goto out_release_bufs;
5930	}
5931
5932	/* Add adapter instance into mid-layer list */
5933	rc = scsi_add_host(pinstance->host, &pdev->dev);
5934	if (rc != 0) {
5935		pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
5936		goto out_release_bufs;
5937	}
5938
5939	scsi_scan_host(pinstance->host);
5940
5941	rc = pmcraid_setup_chrdev(pinstance);
5942
5943	if (rc != 0) {
5944		pmcraid_err("couldn't create mgmt interface, error: %x\n",
5945			     rc);
5946		goto out_remove_host;
5947	}
5948
5949	/* Schedule worker thread to handle CCN and take care of adding and
5950	 * removing devices to OS
5951	 */
5952	atomic_set(&pinstance->expose_resources, 1);
5953	schedule_work(&pinstance->worker_q);
5954	return rc;
5955
5956out_remove_host:
5957	scsi_remove_host(host);
5958
5959out_release_bufs:
5960	pmcraid_release_buffers(pinstance);
5961
5962out_unregister_isr:
5963	pmcraid_kill_tasklets(pinstance);
5964	pmcraid_unregister_interrupt_handler(pinstance);
5965
5966out_scsi_host_put:
5967	scsi_host_put(host);
5968
5969cleanup_nomem:
5970	iounmap(mapped_pci_addr);
5971
5972out_release_regions:
5973	pci_release_regions(pdev);
5974
5975out_disable_device:
5976	atomic_dec(&pmcraid_adapter_count);
 
5977	pci_disable_device(pdev);
5978	return -ENODEV;
5979}
5980
5981/*
5982 * PCI driver structure of pcmraid driver
5983 */
5984static struct pci_driver pmcraid_driver = {
5985	.name = PMCRAID_DRIVER_NAME,
5986	.id_table = pmcraid_pci_table,
5987	.probe = pmcraid_probe,
5988	.remove = pmcraid_remove,
5989	.suspend = pmcraid_suspend,
5990	.resume = pmcraid_resume,
5991	.shutdown = pmcraid_shutdown
5992};
5993
5994/**
5995 * pmcraid_init - module load entry point
5996 */
5997static int __init pmcraid_init(void)
5998{
5999	dev_t dev;
6000	int error;
6001
6002	pmcraid_info("%s Device Driver version: %s\n",
6003			 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6004
6005	error = alloc_chrdev_region(&dev, 0,
6006				    PMCRAID_MAX_ADAPTERS,
6007				    PMCRAID_DEVFILE);
6008
6009	if (error) {
6010		pmcraid_err("failed to get a major number for adapters\n");
6011		goto out_init;
6012	}
6013
6014	pmcraid_major = MAJOR(dev);
6015	pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6016
6017	if (IS_ERR(pmcraid_class)) {
6018		error = PTR_ERR(pmcraid_class);
6019		pmcraid_err("failed to register with sysfs, error = %x\n",
6020			    error);
6021		goto out_unreg_chrdev;
6022	}
6023
6024	error = pmcraid_netlink_init();
6025
6026	if (error)
6027		goto out_unreg_chrdev;
6028
6029	error = pci_register_driver(&pmcraid_driver);
6030
6031	if (error == 0)
6032		goto out_init;
6033
6034	pmcraid_err("failed to register pmcraid driver, error = %x\n",
6035		     error);
6036	class_destroy(pmcraid_class);
6037	pmcraid_netlink_release();
6038
6039out_unreg_chrdev:
6040	unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6041
6042out_init:
6043	return error;
6044}
6045
6046/**
6047 * pmcraid_exit - module unload entry point
6048 */
6049static void __exit pmcraid_exit(void)
6050{
6051	pmcraid_netlink_release();
6052	unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6053				 PMCRAID_MAX_ADAPTERS);
6054	pci_unregister_driver(&pmcraid_driver);
6055	class_destroy(pmcraid_class);
6056}
6057
6058module_init(pmcraid_init);
6059module_exit(pmcraid_exit);