litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

about summary refs log tree commit diff stats

diff options

author	Al Viro <viro@zeniv.linux.org.uk>	2008-08-25 18:18:15 -0400
committer	David S. Miller <davem@davemloft.net>	2008-08-25 18:18:15 -0400
commit	ce3113ec57abcd41cc5a2fed02474aee3f63d12c (patch)
tree	33c5eeb01120aeb013f351e9327d05f3e6f9e827
parent	2f4520d35d89ca6c5cd129c38e3b11f0283b7d1b (diff)

ipv6: sysctl fixes

Braino: net.ipv6 in ipv6 skeleton has no business in rotable class Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>

Diffstat

-rw-r--r--

net/ipv6/sysctl_net_ipv6.c

1 files changed, 1 insertions, 1 deletions


diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c index e6dfaeac6be3..587f8f60c489 100644 --- a/net/ipv6/sysctl_net_ipv6.c +++ b/net/ipv6/sysctl_net_ipv6.c
@@ -156,7 +156,7 @@ static struct ctl_table_header *ip6_base;
156	int ipv6_static_sysctl_register(void)	156	int ipv6_static_sysctl_register(void)
157	{	157	{
158	static struct ctl_table empty[1];	158	static struct ctl_table empty[1];
159	ip6_base = register_net_sysctl_rotable(net_ipv6_ctl_path, empty);	159	ip6_base = register_sysctl_paths(net_ipv6_ctl_path, empty);
160	if (ip6_base == NULL)	160	if (ip6_base == NULL)
161	return -ENOMEM;	161	return -ENOMEM;
162	return 0;	162	return 0;

914026086418

89a368104150

914026086418

89a368104150

914026086418

89a368104150

914026086418

89a368104150

914026086418

89a368104150

914026086418

89a368104150

914026086418

1
2
3

4
5

49
50

159
160

161
162

163
164

175
176
177

250
251
252

294
295
296

298
299
300

330
331
332

424
425
426

574
575

576
577

603
604

704
705
706

708
709

752
753

844
845
846

847
848

849
850
851

972
973
974

980
981
982

983
984

987
988

1068
1069

1091
1092

1315
1316
1317

1320
1321

1322
1323
1324

1360
1361

1362
1363
1364

1371
1372

1413
1414

1417
1418

1419
1420
1421

1423
1424
1425

1461
1462

1533
1534

1535
1536

1544
1545

1548
1549

1557
1558
1559

1579
1580

1582
1583

1636
1637

1640
1641
1642

1701
1702

1877
1878

1880
1881

1945
1946

2046
2047

2196
2197

2247
2248

2314
2315

2364
2365
2366

2375
2376

2388
2389
2390

2392
2393

2422
2423

2487
2488
2489

2512
2513

2671
2672

2679
2680

2732
2733

2926
2927

2971
2972

3040
3041
3042

3043
3044

3052
3053

3061
3062

3119
3120

3180
3181
3182

3216
3217
3218

3236
3237

3238
3239
3240

3241
3242

3244
3245
3246

3248
3249

3415
3416
3417

3431
3432

3448
3449

3597
3598

3601
3602

3650
3651

3652
3653

3654
3655
3656

3658
3659

3660
3661
3662

3663
3664

3697
3698

3764
3765

3767
3768

3777
3778
3779

3790
3791

3802
3803

3805
3806

3807
3808

3831
3832

3926
3927

3929
3930

3932
3933
3934

3960
3961

3969
3970

4075
4076

4152
4153

4158
4159

4162
4163

4221
4222
4223

4237
4238

4247
4248
4249

4250
4251

4268
4269
4270

4320
4321

4361
4362

4367
4368
4369

4488
4489
4490

4493
4494

4508
4509
4510

4539
4540

4545
4546

4662
4663

4700
4701

4728
4729
4730

4732
4733

4798
4799

4860
4861
4862

4875
4876

4949
4950

4959
4960
4961

4968
4969

5018
5019

5071
5072

5094
5095

5308
5309
5310

5311
5312

5314
5315

5317
5318
5319

5322
5323
5324

5325
5326

5508
5509
5510

5513
5514

5575
5576

5577
5578

5667
5668

5721
5722
5723

5724
5725

5727
5728

5879
5880

5901
5902

5903
5904

5931
5932
5933

/*
 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
 *
 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
 *             PMC-Sierra Inc
 *
 * Copyright (C) 2008, 2009 PMC Sierra Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
 * USA
 *
 */
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/hdreg.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <asm/irq.h>
#include <asm/processor.h>
#include <linux/libata.h>
#include <linux/mutex.h>
#include <linux/ktime.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsicam.h>

#include "pmcraid.h"

/*
 *   Module configuration parameters
 */
static unsigned int pmcraid_debug_log;
static unsigned int pmcraid_disable_aen;
static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
static unsigned int pmcraid_enable_msix;

/*
 * Data structures to support multiple adapters by the LLD.
 * pmcraid_adapter_count - count of configured adapters
 */
static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);

/*
 * Supporting user-level control interface through IOCTL commands.
 * pmcraid_major - major number to use
 * pmcraid_minor - minor number(s) to use
 */
static unsigned int pmcraid_major;
static struct class *pmcraid_class;
static DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);

/*
 * Module parameters
 */
MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(PMCRAID_DRIVER_VERSION);

module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(log_level,
		 "Enables firmware error code logging, default :1 high-severity"
		 " errors, 2: all errors including high-severity errors,"
		 " 0: disables logging");

module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(debug,
		 "Enable driver verbose message logging. Set 1 to enable."
		 "(default: 0)");

module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
MODULE_PARM_DESC(disable_aen,
		 "Disable driver aen notifications to apps. Set 1 to disable."
		 "(default: 0)");

/* chip specific constants for PMC MaxRAID controllers (same for
 * 0x5220 and 0x8010
 */
static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
	{
	 .ioastatus = 0x0,
	 .ioarrin = 0x00040,
	 .mailbox = 0x7FC30,
	 .global_intr_mask = 0x00034,
	 .ioa_host_intr = 0x0009C,
	 .ioa_host_intr_clr = 0x000A0,
	 .ioa_host_msix_intr = 0x7FC40,
	 .ioa_host_mask = 0x7FC28,
	 .ioa_host_mask_clr = 0x7FC28,
	 .host_ioa_intr = 0x00020,
	 .host_ioa_intr_clr = 0x00020,
	 .transop_timeout = 300
	 }
};

/*
 * PCI device ids supported by pmcraid driver
 */
static struct pci_device_id pmcraid_pci_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
	  0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
	},
	{}
};

MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);



/**
 * pmcraid_slave_alloc - Prepare for commands to a device
 * @scsi_dev: scsi device struct
 *
 * This function is called by mid-layer prior to sending any command to the new
 * device. Stores resource entry details of the device in scsi_device struct.
 * Queuecommand uses the resource handle and other details to fill up IOARCB
 * while sending commands to the device.
 *
 * Return value:
 *	  0 on success / -ENXIO if device does not exist
 */
static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
{
	struct pmcraid_resource_entry *temp, *res = NULL;
	struct pmcraid_instance *pinstance;
	u8 target, bus, lun;
	unsigned long lock_flags;
	int rc = -ENXIO;
	u16 fw_version;

	pinstance = shost_priv(scsi_dev->host);

	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

	/* Driver exposes VSET and GSCSI resources only; all other device types
	 * are not exposed. Resource list is synchronized using resource lock
	 * so any traversal or modifications to the list should be done inside
	 * this lock
	 */
	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
	list_for_each_entry(temp, &pinstance->used_res_q, queue) {

		/* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
		if (RES_IS_VSET(temp->cfg_entry)) {
			if (fw_version <= PMCRAID_FW_VERSION_1)
				target = temp->cfg_entry.unique_flags1;
			else
				target = le16_to_cpu(temp->cfg_entry.array_id) & 0xFF;

			if (target > PMCRAID_MAX_VSET_TARGETS)
				continue;
			bus = PMCRAID_VSET_BUS_ID;
			lun = 0;
		} else if (RES_IS_GSCSI(temp->cfg_entry)) {
			target = RES_TARGET(temp->cfg_entry.resource_address);
			bus = PMCRAID_PHYS_BUS_ID;
			lun = RES_LUN(temp->cfg_entry.resource_address);
		} else {
			continue;
		}

		if (bus == scsi_dev->channel &&
		    target == scsi_dev->id &&
		    lun == scsi_dev->lun) {
			res = temp;
			break;
		}
	}

	if (res) {
		res->scsi_dev = scsi_dev;
		scsi_dev->hostdata = res;
		res->change_detected = 0;
		atomic_set(&res->read_failures, 0);
		atomic_set(&res->write_failures, 0);
		rc = 0;
	}
	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
	return rc;
}

/**
 * pmcraid_slave_configure - Configures a SCSI device
 * @scsi_dev: scsi device struct
 *
 * This function is executed by SCSI mid layer just after a device is first
 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
 * timeout value (default 30s) will be over-written to a higher value (60s)
 * and max_sectors value will be over-written to 512. It also sets queue depth
 * to host->cmd_per_lun value
 *
 * Return value:
 *	  0 on success
 */
static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
{
	struct pmcraid_resource_entry *res = scsi_dev->hostdata;

	if (!res)
		return 0;

	/* LLD exposes VSETs and Enclosure devices only */
	if (RES_IS_GSCSI(res->cfg_entry) &&
	    scsi_dev->type != TYPE_ENCLOSURE)
		return -ENXIO;

	pmcraid_info("configuring %x:%x:%x:%x\n",
		     scsi_dev->host->unique_id,
		     scsi_dev->channel,
		     scsi_dev->id,
		     (u8)scsi_dev->lun);

	if (RES_IS_GSCSI(res->cfg_entry)) {
		scsi_dev->allow_restart = 1;
	} else if (RES_IS_VSET(res->cfg_entry)) {
		scsi_dev->allow_restart = 1;
		blk_queue_rq_timeout(scsi_dev->request_queue,
				     PMCRAID_VSET_IO_TIMEOUT);
		blk_queue_max_hw_sectors(scsi_dev->request_queue,
				      PMCRAID_VSET_MAX_SECTORS);
	}

	/*
	 * We never want to report TCQ support for these types of devices.
	 */
	if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
		scsi_dev->tagged_supported = 0;

	return 0;
}

/**
 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
 *
 * @scsi_dev: scsi device struct
 *
 * This is called by mid-layer before removing a device. Pointer assignments
 * done in pmcraid_slave_alloc will be reset to NULL here.
 *
 * Return value
 *   none
 */
static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
{
	struct pmcraid_resource_entry *res;

	res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;

	if (res)
		res->scsi_dev = NULL;

	scsi_dev->hostdata = NULL;
}

/**
 * pmcraid_change_queue_depth - Change the device's queue depth
 * @scsi_dev: scsi device struct
 * @depth: depth to set
 *
 * Return value
 *	actual depth set
 */
static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
{
	if (depth > PMCRAID_MAX_CMD_PER_LUN)
		depth = PMCRAID_MAX_CMD_PER_LUN;
	return scsi_change_queue_depth(scsi_dev, depth);
}

/**
 * pmcraid_init_cmdblk - initializes a command block
 *
 * @cmd: pointer to struct pmcraid_cmd to be initialized
 * @index: if >=0 first time initialization; otherwise reinitialization
 *
 * Return Value
 *	 None
 */
static void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
{
	struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
	dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;

	if (index >= 0) {
		/* first time initialization (called from  probe) */
		u32 ioasa_offset =
			offsetof(struct pmcraid_control_block, ioasa);

		cmd->index = index;
		ioarcb->response_handle = cpu_to_le32(index << 2);
		ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
		ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
		ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
	} else {
		/* re-initialization of various lengths, called once command is
		 * processed by IOA
		 */
		memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
		ioarcb->hrrq_id = 0;
		ioarcb->request_flags0 = 0;
		ioarcb->request_flags1 = 0;
		ioarcb->cmd_timeout = 0;
		ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
		ioarcb->ioadl_bus_addr = 0;
		ioarcb->ioadl_length = 0;
		ioarcb->data_transfer_length = 0;
		ioarcb->add_cmd_param_length = 0;
		ioarcb->add_cmd_param_offset = 0;
		cmd->ioa_cb->ioasa.ioasc = 0;
		cmd->ioa_cb->ioasa.residual_data_length = 0;
		cmd->time_left = 0;
	}

	cmd->cmd_done = NULL;
	cmd->scsi_cmd = NULL;
	cmd->release = 0;
	cmd->completion_req = 0;
	cmd->sense_buffer = NULL;
	cmd->sense_buffer_dma = 0;
	cmd->dma_handle = 0;
	timer_setup(&cmd->timer, NULL, 0);
}

/**
 * pmcraid_reinit_cmdblk - reinitialize a command block
 *
 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
 *
 * Return Value
 *	 None
 */
static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
{
	pmcraid_init_cmdblk(cmd, -1);
}

/**
 * pmcraid_get_free_cmd - get a free cmd block from command block pool
 * @pinstance: adapter instance structure
 *
 * Return Value:
 *	returns pointer to cmd block or NULL if no blocks are available
 */
static struct pmcraid_cmd *pmcraid_get_free_cmd(
	struct pmcraid_instance *pinstance
)
{
	struct pmcraid_cmd *cmd = NULL;
	unsigned long lock_flags;

	/* free cmd block list is protected by free_pool_lock */
	spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);

	if (!list_empty(&pinstance->free_cmd_pool)) {
		cmd = list_entry(pinstance->free_cmd_pool.next,
				 struct pmcraid_cmd, free_list);
		list_del(&cmd->free_list);
	}
	spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);

	/* Initialize the command block before giving it the caller */
	if (cmd != NULL)
		pmcraid_reinit_cmdblk(cmd);
	return cmd;
}

/**
 * pmcraid_return_cmd - return a completed command block back into free pool
 * @cmd: pointer to the command block
 *
 * Return Value:
 *	nothing
 */
static void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
	list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
	spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
}

/**
 * pmcraid_read_interrupts -  reads IOA interrupts
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return value
 *	 interrupts read from IOA
 */
static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
{
	return (pinstance->interrupt_mode) ?
		ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
		ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
}

/**
 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
 *
 * @pinstance: pointer to per adapter instance structure
 * @intrs: interrupts to disable
 *
 * Return Value
 *	 None
 */
static void pmcraid_disable_interrupts(
	struct pmcraid_instance *pinstance,
	u32 intrs
)
{
	u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
	u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;

	iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
	iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
	ioread32(pinstance->int_regs.global_interrupt_mask_reg);

	if (!pinstance->interrupt_mode) {
		iowrite32(intrs,
			pinstance->int_regs.ioa_host_interrupt_mask_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
	}
}

/**
 * pmcraid_enable_interrupts - Enables specified interrupts
 *
 * @pinstance: pointer to per adapter instance structure
 * @intr: interrupts to enable
 *
 * Return Value
 *	 None
 */
static void pmcraid_enable_interrupts(
	struct pmcraid_instance *pinstance,
	u32 intrs
)
{
	u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
	u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);

	iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);

	if (!pinstance->interrupt_mode) {
		iowrite32(~intrs,
			 pinstance->int_regs.ioa_host_interrupt_mask_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
	}

	pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
		ioread32(pinstance->int_regs.global_interrupt_mask_reg),
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
}

/**
 * pmcraid_clr_trans_op - clear trans to op interrupt
 *
 * @pinstance: pointer to per adapter instance structure
 *
 * Return Value
 *	 None
 */
static void pmcraid_clr_trans_op(
	struct pmcraid_instance *pinstance
)
{
	unsigned long lock_flags;

	if (!pinstance->interrupt_mode) {
		iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
			pinstance->int_regs.ioa_host_interrupt_mask_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
		iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
			pinstance->int_regs.ioa_host_interrupt_clr_reg);
		ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
	}

	if (pinstance->reset_cmd != NULL) {
		del_timer(&pinstance->reset_cmd->timer);
		spin_lock_irqsave(
			pinstance->host->host_lock, lock_flags);
		pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
		spin_unlock_irqrestore(
			pinstance->host->host_lock, lock_flags);
	}
}

/**
 * pmcraid_reset_type - Determine the required reset type
 * @pinstance: pointer to adapter instance structure
 *
 * IOA requires hard reset if any of the following conditions is true.
 * 1. If HRRQ valid interrupt is not masked
 * 2. IOA reset alert doorbell is set
 * 3. If there are any error interrupts
 */
static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
{
	u32 mask;
	u32 intrs;
	u32 alerts;

	mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
	intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
	alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);

	if ((mask & INTRS_HRRQ_VALID) == 0 ||
	    (alerts & DOORBELL_IOA_RESET_ALERT) ||
	    (intrs & PMCRAID_ERROR_INTERRUPTS)) {
		pmcraid_info("IOA requires hard reset\n");
		pinstance->ioa_hard_reset = 1;
	}

	/* If unit check is active, trigger the dump */
	if (intrs & INTRS_IOA_UNIT_CHECK)
		pinstance->ioa_unit_check = 1;
}

/**
 * pmcraid_bist_done - completion function for PCI BIST
 * @cmd: pointer to reset command
 * Return Value
 *	none
 */

static void pmcraid_ioa_reset(struct pmcraid_cmd *);

static void pmcraid_bist_done(struct timer_list *t)
{
	struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;
	int rc;
	u16 pci_reg;

	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);

	/* If PCI config space can't be accessed wait for another two secs */
	if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
	    cmd->time_left > 0) {
		pmcraid_info("BIST not complete, waiting another 2 secs\n");
		cmd->timer.expires = jiffies + cmd->time_left;
		cmd->time_left = 0;
		add_timer(&cmd->timer);
	} else {
		cmd->time_left = 0;
		pmcraid_info("BIST is complete, proceeding with reset\n");
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_ioa_reset(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	}
}

/**
 * pmcraid_start_bist - starts BIST
 * @cmd: pointer to reset cmd
 * Return Value
 *   none
 */
static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 doorbells, intrs;

	/* proceed with bist and wait for 2 seconds */
	iowrite32(DOORBELL_IOA_START_BIST,
		pinstance->int_regs.host_ioa_interrupt_reg);
	doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
	intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
	pmcraid_info("doorbells after start bist: %x intrs: %x\n",
		      doorbells, intrs);

	cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
	cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
	cmd->timer.function = pmcraid_bist_done;
	add_timer(&cmd->timer);
}

/**
 * pmcraid_reset_alert_done - completion routine for reset_alert
 * @cmd: pointer to command block used in reset sequence
 * Return value
 *  None
 */
static void pmcraid_reset_alert_done(struct timer_list *t)
{
	struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 status = ioread32(pinstance->ioa_status);
	unsigned long lock_flags;

	/* if the critical operation in progress bit is set or the wait times
	 * out, invoke reset engine to proceed with hard reset. If there is
	 * some more time to wait, restart the timer
	 */
	if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
	    cmd->time_left <= 0) {
		pmcraid_info("critical op is reset proceeding with reset\n");
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_ioa_reset(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else {
		pmcraid_info("critical op is not yet reset waiting again\n");
		/* restart timer if some more time is available to wait */
		cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
		cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
		cmd->timer.function = pmcraid_reset_alert_done;
		add_timer(&cmd->timer);
	}
}

/**
 * pmcraid_reset_alert - alerts IOA for a possible reset
 * @cmd : command block to be used for reset sequence.
 *
 * Return Value
 *	returns 0 if pci config-space is accessible and RESET_DOORBELL is
 *	successfully written to IOA. Returns non-zero in case pci_config_space
 *	is not accessible
 */
static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 doorbells;
	int rc;
	u16 pci_reg;

	/* If we are able to access IOA PCI config space, alert IOA that we are
	 * going to reset it soon. This enables IOA to preserv persistent error
	 * data if any. In case memory space is not accessible, proceed with
	 * BIST or slot_reset
	 */
	rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
	if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {

		/* wait for IOA permission i.e until CRITICAL_OPERATION bit is
		 * reset IOA doesn't generate any interrupts when CRITICAL
		 * OPERATION bit is reset. A timer is started to wait for this
		 * bit to be reset.
		 */
		cmd->time_left = PMCRAID_RESET_TIMEOUT;
		cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
		cmd->timer.function = pmcraid_reset_alert_done;
		add_timer(&cmd->timer);

		iowrite32(DOORBELL_IOA_RESET_ALERT,
			pinstance->int_regs.host_ioa_interrupt_reg);
		doorbells =
			ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
		pmcraid_info("doorbells after reset alert: %x\n", doorbells);
	} else {
		pmcraid_info("PCI config is not accessible starting BIST\n");
		pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
		pmcraid_start_bist(cmd);
	}
}

/**
 * pmcraid_timeout_handler -  Timeout handler for internally generated ops
 *
 * @cmd : pointer to command structure, that got timedout
 *
 * This function blocks host requests and initiates an adapter reset.
 *
 * Return value:
 *   None
 */
static void pmcraid_timeout_handler(struct timer_list *t)
{
	struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	dev_info(&pinstance->pdev->dev,
		"Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
		cmd->ioa_cb->ioarcb.cdb[0]);

	/* Command timeouts result in hard reset sequence. The command that got
	 * timed out may be the one used as part of reset sequence. In this
	 * case restart reset sequence using the same command block even if
	 * reset is in progress. Otherwise fail this command and get a free
	 * command block to restart the reset sequence.
	 */
	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
	if (!pinstance->ioa_reset_in_progress) {
		pinstance->ioa_reset_attempts = 0;
		cmd = pmcraid_get_free_cmd(pinstance);

		/* If we are out of command blocks, just return here itself.
		 * Some other command's timeout handler can do the reset job
		 */
		if (cmd == NULL) {
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       lock_flags);
			pmcraid_err("no free cmnd block for timeout handler\n");
			return;
		}

		pinstance->reset_cmd = cmd;
		pinstance->ioa_reset_in_progress = 1;
	} else {
		pmcraid_info("reset is already in progress\n");

		if (pinstance->reset_cmd != cmd) {
			/* This command should have been given to IOA, this
			 * command will be completed by fail_outstanding_cmds
			 * anyway
			 */
			pmcraid_err("cmd is pending but reset in progress\n");
		}

		/* If this command was being used as part of the reset
		 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
		 * causes fail_outstanding_commands not to return the command
		 * block back to free pool
		 */
		if (cmd == pinstance->reset_cmd)
			cmd->cmd_done = pmcraid_ioa_reset;
	}

	/* Notify apps of important IOA bringup/bringdown sequences */
	if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
	    pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
		pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_RESET_START);

	pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
	scsi_block_requests(pinstance->host);
	pmcraid_reset_alert(cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
}

/**
 * pmcraid_internal_done - completion routine for internally generated cmds
 *
 * @cmd: command that got response from IOA
 *
 * Return Value:
 *	 none
 */
static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	/* Some of the internal commands are sent with callers blocking for the
	 * response. Same will be indicated as part of cmd->completion_req
	 * field. Response path needs to wake up any waiters waiting for cmd
	 * completion if this flag is set.
	 */
	if (cmd->completion_req) {
		cmd->completion_req = 0;
		complete(&cmd->wait_for_completion);
	}

	/* most of the internal commands are completed by caller itself, so
	 * no need to return the command block back to free pool until we are
	 * required to do so (e.g once done with initialization).
	 */
	if (cmd->release) {
		cmd->release = 0;
		pmcraid_return_cmd(cmd);
	}
}

/**
 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
 *
 * @cmd: command that got response from IOA
 *
 * This routine is called after driver re-reads configuration table due to a
 * lost CCN. It returns the command block back to free pool and schedules
 * worker thread to add/delete devices into the system.
 *
 * Return Value:
 *	 none
 */
static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	if (cmd->release) {
		cmd->release = 0;
		pmcraid_return_cmd(cmd);
	}
	pmcraid_info("scheduling worker for config table reinitialization\n");
	schedule_work(&cmd->drv_inst->worker_q);
}

/**
 * pmcraid_erp_done - Process completion of SCSI error response from device
 * @cmd: pmcraid_command
 *
 * This function copies the sense buffer into the scsi_cmd struct and completes
 * scsi_cmd by calling scsi_done function.
 *
 * Return value:
 *  none
 */
static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);

	if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
		scsi_cmd->result |= (DID_ERROR << 16);
		scmd_printk(KERN_INFO, scsi_cmd,
			    "command CDB[0] = %x failed with IOASC: 0x%08X\n",
			    cmd->ioa_cb->ioarcb.cdb[0], ioasc);
	}

	if (cmd->sense_buffer) {
		dma_unmap_single(&pinstance->pdev->dev, cmd->sense_buffer_dma,
				 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
		cmd->sense_buffer = NULL;
		cmd->sense_buffer_dma = 0;
	}

	scsi_dma_unmap(scsi_cmd);
	pmcraid_return_cmd(cmd);
	scsi_cmd->scsi_done(scsi_cmd);
}

/**
 * pmcraid_fire_command - sends an IOA command to adapter
 *
 * This function adds the given block into pending command list
 * and returns without waiting
 *
 * @cmd : command to be sent to the device
 *
 * Return Value
 *	None
 */
static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	/* Add this command block to pending cmd pool. We do this prior to
	 * writting IOARCB to ioarrin because IOA might complete the command
	 * by the time we are about to add it to the list. Response handler
	 * (isr/tasklet) looks for cmd block in the pending pending list.
	 */
	spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
	list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
	spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
	atomic_inc(&pinstance->outstanding_cmds);

	/* driver writes lower 32-bit value of IOARCB address only */
	mb();
	iowrite32(le64_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr), pinstance->ioarrin);
}

/**
 * pmcraid_send_cmd - fires a command to IOA
 *
 * This function also sets up timeout function, and command completion
 * function
 *
 * @cmd: pointer to the command block to be fired to IOA
 * @cmd_done: command completion function, called once IOA responds
 * @timeout: timeout to wait for this command completion
 * @timeout_func: timeout handler
 *
 * Return value
 *   none
 */
static void pmcraid_send_cmd(
	struct pmcraid_cmd *cmd,
	void (*cmd_done) (struct pmcraid_cmd *),
	unsigned long timeout,
	void (*timeout_func) (struct timer_list *)
)
{
	/* initialize done function */
	cmd->cmd_done = cmd_done;

	if (timeout_func) {
		/* setup timeout handler */
		cmd->timer.expires = jiffies + timeout;
		cmd->timer.function = timeout_func;
		add_timer(&cmd->timer);
	}

	/* fire the command to IOA */
	_pmcraid_fire_command(cmd);
}

/**
 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
 * @cmd: pointer to the command block used for sending IOA shutdown command
 *
 * Return value
 *  None
 */
static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	unsigned long lock_flags;

	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
	pmcraid_ioa_reset(cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
}

/**
 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
 *
 * @cmd: pointer to the command block used as part of reset sequence
 *
 * Return Value
 *  None
 */
static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	/* Note that commands sent during reset require next command to be sent
	 * to IOA. Hence reinit the done function as well as timeout function
	 */
	pmcraid_reinit_cmdblk(cmd);
	cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
	cmd->ioa_cb->ioarcb.resource_handle =
		cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
	cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;

	/* fire shutdown command to hardware. */
	pmcraid_info("firing normal shutdown command (%d) to IOA\n",
		     le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));

	pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);

	pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
			 PMCRAID_SHUTDOWN_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_get_fwversion_done - completion function for get_fwversion
 *
 * @cmd: pointer to command block used to send INQUIRY command
 *
 * Return Value
 *	none
 */
static void pmcraid_querycfg(struct pmcraid_cmd *);

static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	unsigned long lock_flags;

	/* configuration table entry size depends on firmware version. If fw
	 * version is not known, it is not possible to interpret IOA config
	 * table
	 */
	if (ioasc) {
		pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
		pmcraid_reset_alert(cmd);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else  {
		pmcraid_querycfg(cmd);
	}
}

/**
 * pmcraid_get_fwversion - reads firmware version information
 *
 * @cmd: pointer to command block used to send INQUIRY command
 *
 * Return Value
 *	none
 */
static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_ioadl_desc *ioadl;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u16 data_size = sizeof(struct pmcraid_inquiry_data);

	pmcraid_reinit_cmdblk(cmd);
	ioarcb->request_type = REQ_TYPE_SCSI;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	ioarcb->cdb[0] = INQUIRY;
	ioarcb->cdb[1] = 1;
	ioarcb->cdb[2] = 0xD0;
	ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
	ioarcb->cdb[4] = data_size & 0xFF;

	/* Since entire inquiry data it can be part of IOARCB itself
	 */
	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
	ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));

	ioarcb->request_flags0 |= NO_LINK_DESCS;
	ioarcb->data_transfer_length = cpu_to_le32(data_size);
	ioadl = &(ioarcb->add_data.u.ioadl[0]);
	ioadl->flags = IOADL_FLAGS_LAST_DESC;
	ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
	ioadl->data_len = cpu_to_le32(data_size);

	pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
			 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
}

/**
 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
 * @cmd: pointer to command block to be used for identify hrrq
 *
 * Return Value
 *	 none
 */
static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	int index = cmd->hrrq_index;
	__be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
	__be32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
	void (*done_function)(struct pmcraid_cmd *);

	pmcraid_reinit_cmdblk(cmd);
	cmd->hrrq_index = index + 1;

	if (cmd->hrrq_index < pinstance->num_hrrq) {
		done_function = pmcraid_identify_hrrq;
	} else {
		cmd->hrrq_index = 0;
		done_function = pmcraid_get_fwversion;
	}

	/* Initialize ioarcb */
	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);

	/* initialize the hrrq number where IOA will respond to this command */
	ioarcb->hrrq_id = index;
	ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
	ioarcb->cdb[1] = index;

	/* IOA expects 64-bit pci address to be written in B.E format
	 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
	 */
	pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
		     hrrq_addr, ioarcb->ioarcb_bus_addr, index);

	memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
	memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));

	/* Subsequent commands require HRRQ identification to be successful.
	 * Note that this gets called even during reset from SCSI mid-layer
	 * or tasklet
	 */
	pmcraid_send_cmd(cmd, done_function,
			 PMCRAID_INTERNAL_TIMEOUT,
			 pmcraid_timeout_handler);
}

static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);

/**
 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
 *
 * @cmd: initialized command block pointer
 *
 * Return Value
 *   none
 */
static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
{
	if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
		atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
	else
		atomic_set(&(cmd->drv_inst->ldn.ignore), 0);

	pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
}

/**
 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
 *
 * @pinstance: pointer to adapter instance structure
 * @type: HCAM type
 *
 * Return Value
 *   pointer to initialized pmcraid_cmd structure or NULL
 */
static struct pmcraid_cmd *pmcraid_init_hcam
(
	struct pmcraid_instance *pinstance,
	u8 type
)
{
	struct pmcraid_cmd *cmd;
	struct pmcraid_ioarcb *ioarcb;
	struct pmcraid_ioadl_desc *ioadl;
	struct pmcraid_hostrcb *hcam;
	void (*cmd_done) (struct pmcraid_cmd *);
	dma_addr_t dma;
	int rcb_size;

	cmd = pmcraid_get_free_cmd(pinstance);

	if (!cmd) {
		pmcraid_err("no free command blocks for hcam\n");
		return cmd;
	}

	if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
		rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
		cmd_done = pmcraid_process_ccn;
		dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
		hcam = &pinstance->ccn;
	} else {
		rcb_size = sizeof(struct pmcraid_hcam_ldn);
		cmd_done = pmcraid_process_ldn;
		dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
		hcam = &pinstance->ldn;
	}

	/* initialize command pointer used for HCAM registration */
	hcam->cmd = cmd;

	ioarcb = &cmd->ioa_cb->ioarcb;
	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
	ioadl = ioarcb->add_data.u.ioadl;

	/* Initialize ioarcb */
	ioarcb->request_type = REQ_TYPE_HCAM;
	ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
	ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
	ioarcb->cdb[1] = type;
	ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
	ioarcb->cdb[8] = (rcb_size) & 0xFF;

	ioarcb->data_transfer_length = cpu_to_le32(rcb_size);

	ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
	ioadl[0].data_len = cpu_to_le32(rcb_size);
	ioadl[0].address = cpu_to_le64(dma);

	cmd->cmd_done = cmd_done;
	return cmd;
}

/**
 * pmcraid_send_hcam - Send an HCAM to IOA
 * @pinstance: ioa config struct
 * @type: HCAM type
 *
 * This function will send a Host Controlled Async command to IOA.
 *
 * Return value:
 *	none
 */
static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
{
	struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
	pmcraid_send_hcam_cmd(cmd);
}


/**
 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
 *
 * @cmd: pointer to cmd that is used as cancelling command
 * @cmd_to_cancel: pointer to the command that needs to be cancelled
 */
static void pmcraid_prepare_cancel_cmd(
	struct pmcraid_cmd *cmd,
	struct pmcraid_cmd *cmd_to_cancel
)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	__be64 ioarcb_addr;

	/* IOARCB address of the command to be cancelled is given in
	 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
	 * IOARCB address are not masked.
	 */
	ioarcb_addr = cpu_to_be64(le64_to_cpu(cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr));

	/* Get the resource handle to where the command to be aborted has been
	 * sent.
	 */
	ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
	ioarcb->request_type = REQ_TYPE_IOACMD;
	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
	ioarcb->cdb[0] = PMCRAID_ABORT_CMD;

	memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
}

/**
 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
 *
 * @cmd: command to be used as cancelling command
 * @type: HCAM type
 * @cmd_done: op done function for the cancelling command
 */
static void pmcraid_cancel_hcam(
	struct pmcraid_cmd *cmd,
	u8 type,
	void (*cmd_done) (struct pmcraid_cmd *)
)
{
	struct pmcraid_instance *pinstance;
	struct pmcraid_hostrcb  *hcam;

	pinstance = cmd->drv_inst;
	hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
		&pinstance->ldn : &pinstance->ccn;

	/* prepare for cancelling previous hcam command. If the HCAM is
	 * currently not pending with IOA, we would have hcam->cmd as non-null
	 */
	if (hcam->cmd == NULL)
		return;

	pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);

	/* writing to IOARRIN must be protected by host_lock, as mid-layer
	 * schedule queuecommand while we are doing this
	 */
	pmcraid_send_cmd(cmd, cmd_done,
			 PMCRAID_INTERNAL_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
 *
 * @cmd: command block to be used for cancelling the HCAM
 */
static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
{
	pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
		     cmd->ioa_cb->ioarcb.cdb[0],
		     le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));

	pmcraid_reinit_cmdblk(cmd);

	pmcraid_cancel_hcam(cmd,
			    PMCRAID_HCAM_CODE_CONFIG_CHANGE,
			    pmcraid_ioa_shutdown);
}

/**
 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
 *
 * @cmd: command block to be used for cancelling the HCAM
 */
static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
{
	pmcraid_cancel_hcam(cmd,
			    PMCRAID_HCAM_CODE_LOG_DATA,
			    pmcraid_cancel_ccn);
}

/**
 * pmcraid_expose_resource - check if the resource can be exposed to OS
 *
 * @fw_version: firmware version code
 * @cfgte: pointer to configuration table entry of the resource
 *
 * Return value:
 *	true if resource can be added to midlayer, false(0) otherwise
 */
static int pmcraid_expose_resource(u16 fw_version,
				   struct pmcraid_config_table_entry *cfgte)
{
	int retval = 0;

	if (cfgte->resource_type == RES_TYPE_VSET) {
		if (fw_version <= PMCRAID_FW_VERSION_1)
			retval = ((cfgte->unique_flags1 & 0x80) == 0);
		else
			retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
				  (cfgte->unique_flags1 & 0x80) == 0);

	} else if (cfgte->resource_type == RES_TYPE_GSCSI)
		retval = (RES_BUS(cfgte->resource_address) !=
				PMCRAID_VIRTUAL_ENCL_BUS_ID);
	return retval;
}

/* attributes supported by pmcraid_event_family */
enum {
	PMCRAID_AEN_ATTR_UNSPEC,
	PMCRAID_AEN_ATTR_EVENT,
	__PMCRAID_AEN_ATTR_MAX,
};
#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)

/* commands supported by pmcraid_event_family */
enum {
	PMCRAID_AEN_CMD_UNSPEC,
	PMCRAID_AEN_CMD_EVENT,
	__PMCRAID_AEN_CMD_MAX,
};
#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)

static struct genl_multicast_group pmcraid_mcgrps[] = {
	{ .name = "events", /* not really used - see ID discussion below */ },
};

static struct genl_family pmcraid_event_family __ro_after_init = {
	.module = THIS_MODULE,
	.name = "pmcraid",
	.version = 1,
	.maxattr = PMCRAID_AEN_ATTR_MAX,
	.mcgrps = pmcraid_mcgrps,
	.n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
};

/**
 * pmcraid_netlink_init - registers pmcraid_event_family
 *
 * Return value:
 *	0 if the pmcraid_event_family is successfully registered
 *	with netlink generic, non-zero otherwise
 */
static int __init pmcraid_netlink_init(void)
{
	int result;

	result = genl_register_family(&pmcraid_event_family);

	if (result)
		return result;

	pmcraid_info("registered NETLINK GENERIC group: %d\n",
		     pmcraid_event_family.id);

	return result;
}

/**
 * pmcraid_netlink_release - unregisters pmcraid_event_family
 *
 * Return value:
 *	none
 */
static void pmcraid_netlink_release(void)
{
	genl_unregister_family(&pmcraid_event_family);
}

/**
 * pmcraid_notify_aen - sends event msg to user space application
 * @pinstance: pointer to adapter instance structure
 * @type: HCAM type
 *
 * Return value:
 *	0 if success, error value in case of any failure.
 */
static int pmcraid_notify_aen(
	struct pmcraid_instance *pinstance,
	struct pmcraid_aen_msg  *aen_msg,
	u32    data_size
)
{
	struct sk_buff *skb;
	void *msg_header;
	u32  total_size, nla_genl_hdr_total_size;
	int result;

	aen_msg->hostno = (pinstance->host->unique_id << 16 |
			   MINOR(pinstance->cdev.dev));
	aen_msg->length = data_size;

	data_size += sizeof(*aen_msg);

	total_size = nla_total_size(data_size);
	/* Add GENL_HDR to total_size */
	nla_genl_hdr_total_size =
		(total_size + (GENL_HDRLEN +
		((struct genl_family *)&pmcraid_event_family)->hdrsize)
		 + NLMSG_HDRLEN);
	skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);


	if (!skb) {
		pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
			     total_size);
		return -ENOMEM;
	}

	/* add the genetlink message header */
	msg_header = genlmsg_put(skb, 0, 0,
				 &pmcraid_event_family, 0,
				 PMCRAID_AEN_CMD_EVENT);
	if (!msg_header) {
		pmcraid_err("failed to copy command details\n");
		nlmsg_free(skb);
		return -ENOMEM;
	}

	result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);

	if (result) {
		pmcraid_err("failed to copy AEN attribute data\n");
		nlmsg_free(skb);
		return -EINVAL;
	}

	/* send genetlink multicast message to notify appplications */
	genlmsg_end(skb, msg_header);

	result = genlmsg_multicast(&pmcraid_event_family, skb,
				   0, 0, GFP_ATOMIC);

	/* If there are no listeners, genlmsg_multicast may return non-zero
	 * value.
	 */
	if (result)
		pmcraid_info("error (%x) sending aen event message\n", result);
	return result;
}

/**
 * pmcraid_notify_ccn - notifies about CCN event msg to user space
 * @pinstance: pointer adapter instance structure
 *
 * Return value:
 *	0 if success, error value in case of any failure
 */
static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
{
	return pmcraid_notify_aen(pinstance,
				pinstance->ccn.msg,
				le32_to_cpu(pinstance->ccn.hcam->data_len) +
				sizeof(struct pmcraid_hcam_hdr));
}

/**
 * pmcraid_notify_ldn - notifies about CCN event msg to user space
 * @pinstance: pointer adapter instance structure
 *
 * Return value:
 *	0 if success, error value in case of any failure
 */
static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
{
	return pmcraid_notify_aen(pinstance,
				pinstance->ldn.msg,
				le32_to_cpu(pinstance->ldn.hcam->data_len) +
				sizeof(struct pmcraid_hcam_hdr));
}

/**
 * pmcraid_notify_ioastate - sends IOA state event msg to user space
 * @pinstance: pointer adapter instance structure
 * @evt: controller state event to be sent
 *
 * Return value:
 *	0 if success, error value in case of any failure
 */
static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
{
	pinstance->scn.ioa_state = evt;
	pmcraid_notify_aen(pinstance,
			  &pinstance->scn.msg,
			  sizeof(u32));
}

/**
 * pmcraid_handle_config_change - Handle a config change from the adapter
 * @pinstance: pointer to per adapter instance structure
 *
 * Return value:
 *  none
 */

static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
{
	struct pmcraid_config_table_entry *cfg_entry;
	struct pmcraid_hcam_ccn *ccn_hcam;
	struct pmcraid_cmd *cmd;
	struct pmcraid_cmd *cfgcmd;
	struct pmcraid_resource_entry *res = NULL;
	unsigned long lock_flags;
	unsigned long host_lock_flags;
	u32 new_entry = 1;
	u32 hidden_entry = 0;
	u16 fw_version;
	int rc;

	ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
	cfg_entry = &ccn_hcam->cfg_entry;
	fw_version = be16_to_cpu(pinstance->inq_data->fw_version);

	pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
		 res: %x:%x:%x:%x\n",
		 le32_to_cpu(pinstance->ccn.hcam->ilid),
		 pinstance->ccn.hcam->op_code,
		(le32_to_cpu(pinstance->ccn.hcam->timestamp1) |
		((le32_to_cpu(pinstance->ccn.hcam->timestamp2) & 0xffffffffLL) << 32)),
		 pinstance->ccn.hcam->notification_type,
		 pinstance->ccn.hcam->notification_lost,
		 pinstance->ccn.hcam->flags,
		 pinstance->host->unique_id,
		 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
		 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
			RES_BUS(cfg_entry->resource_address)),
		 RES_IS_VSET(*cfg_entry) ?
			(fw_version <= PMCRAID_FW_VERSION_1 ?
				cfg_entry->unique_flags1 :
				le16_to_cpu(cfg_entry->array_id) & 0xFF) :
			RES_TARGET(cfg_entry->resource_address),
		 RES_LUN(cfg_entry->resource_address));


	/* If this HCAM indicates a lost notification, read the config table */
	if (pinstance->ccn.hcam->notification_lost) {
		cfgcmd = pmcraid_get_free_cmd(pinstance);
		if (cfgcmd) {
			pmcraid_info("lost CCN, reading config table\b");
			pinstance->reinit_cfg_table = 1;
			pmcraid_querycfg(cfgcmd);
		} else {
			pmcraid_err("lost CCN, no free cmd for querycfg\n");
		}
		goto out_notify_apps;
	}

	/* If this resource is not going to be added to mid-layer, just notify
	 * applications and return. If this notification is about hiding a VSET
	 * resource, check if it was exposed already.
	 */
	if (pinstance->ccn.hcam->notification_type ==
	    NOTIFICATION_TYPE_ENTRY_CHANGED &&
	    cfg_entry->resource_type == RES_TYPE_VSET) {
		hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
	} else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
		goto out_notify_apps;
	}

	spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
	list_for_each_entry(res, &pinstance->used_res_q, queue) {
		rc = memcmp(&res->cfg_entry.resource_address,
			    &cfg_entry->resource_address,
			    sizeof(cfg_entry->resource_address));
		if (!rc) {
			new_entry = 0;
			break;
		}
	}

	if (new_entry) {

		if (hidden_entry) {
			spin_unlock_irqrestore(&pinstance->resource_lock,
						lock_flags);
			goto out_notify_apps;
		}

		/* If there are more number of resources than what driver can
		 * manage, do not notify the applications about the CCN. Just
		 * ignore this notifications and re-register the same HCAM
		 */
		if (list_empty(&pinstance->free_res_q)) {
			spin_unlock_irqrestore(&pinstance->resource_lock,
						lock_flags);
			pmcraid_err("too many resources attached\n");
			spin_lock_irqsave(pinstance->host->host_lock,
					  host_lock_flags);
			pmcraid_send_hcam(pinstance,
					  PMCRAID_HCAM_CODE_CONFIG_CHANGE);
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       host_lock_flags);
			return;
		}

		res = list_entry(pinstance->free_res_q.next,
				 struct pmcraid_resource_entry, queue);

		list_del(&res->queue);
		res->scsi_dev = NULL;
		res->reset_progress = 0;
		list_add_tail(&res->queue, &pinstance->used_res_q);
	}

	memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);

	if (pinstance->ccn.hcam->notification_type ==
	    NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
		if (res->scsi_dev) {
			if (fw_version <= PMCRAID_FW_VERSION_1)
				res->cfg_entry.unique_flags1 &= 0x7F;
			else
				res->cfg_entry.array_id &= cpu_to_le16(0xFF);
			res->change_detected = RES_CHANGE_DEL;
			res->cfg_entry.resource_handle =
				PMCRAID_INVALID_RES_HANDLE;
			schedule_work(&pinstance->worker_q);
		} else {
			/* This may be one of the non-exposed resources */
			list_move_tail(&res->queue, &pinstance->free_res_q);
		}
	} else if (!res->scsi_dev) {
		res->change_detected = RES_CHANGE_ADD;
		schedule_work(&pinstance->worker_q);
	}
	spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);

out_notify_apps:

	/* Notify configuration changes to registered applications.*/
	if (!pmcraid_disable_aen)
		pmcraid_notify_ccn(pinstance);

	cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
	if (cmd)
		pmcraid_send_hcam_cmd(cmd);
}

/**
 * pmcraid_get_error_info - return error string for an ioasc
 * @ioasc: ioasc code
 * Return Value
 *	 none
 */
static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
{
	int i;
	for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
		if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
			return &pmcraid_ioasc_error_table[i];
	}
	return NULL;
}

/**
 * pmcraid_ioasc_logger - log IOASC information based user-settings
 * @ioasc: ioasc code
 * @cmd: pointer to command that resulted in 'ioasc'
 */
static void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);

	if (error_info == NULL ||
		cmd->drv_inst->current_log_level < error_info->log_level)
		return;

	/* log the error string */
	pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
		cmd->ioa_cb->ioarcb.cdb[0],
		le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
		ioasc, error_info->error_string);
}

/**
 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
 *
 * @pinstance: pointer to per adapter instance structure
 *
 * Return value:
 *  none
 */
static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
{
	struct pmcraid_hcam_ldn *hcam_ldn;
	u32 ioasc;

	hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;

	pmcraid_info
		("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
		 pinstance->ldn.hcam->ilid,
		 pinstance->ldn.hcam->op_code,
		 pinstance->ldn.hcam->notification_type,
		 pinstance->ldn.hcam->notification_lost,
		 pinstance->ldn.hcam->flags,
		 pinstance->ldn.hcam->overlay_id);

	/* log only the errors, no need to log informational log entries */
	if (pinstance->ldn.hcam->notification_type !=
	    NOTIFICATION_TYPE_ERROR_LOG)
		return;

	if (pinstance->ldn.hcam->notification_lost ==
	    HOSTRCB_NOTIFICATIONS_LOST)
		dev_info(&pinstance->pdev->dev, "Error notifications lost\n");

	ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);

	if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
		ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
		dev_info(&pinstance->pdev->dev,
			"UnitAttention due to IOA Bus Reset\n");
		scsi_report_bus_reset(
			pinstance->host,
			RES_BUS(hcam_ldn->error_log.fd_ra));
	}

	return;
}

/**
 * pmcraid_process_ccn - Op done function for a CCN.
 * @cmd: pointer to command struct
 *
 * This function is the op done function for a configuration
 * change notification
 *
 * Return value:
 * none
 */
static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	unsigned long lock_flags;

	pinstance->ccn.cmd = NULL;
	pmcraid_return_cmd(cmd);

	/* If driver initiated IOA reset happened while this hcam was pending
	 * with IOA, or IOA bringdown sequence is in progress, no need to
	 * re-register the hcam
	 */
	if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
	    atomic_read(&pinstance->ccn.ignore) == 1) {
		return;
	} else if (ioasc) {
		dev_info(&pinstance->pdev->dev,
			"Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
		pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	} else {
		pmcraid_handle_config_change(pinstance);
	}
}

/**
 * pmcraid_process_ldn - op done function for an LDN
 * @cmd: pointer to command block
 *
 * Return value
 *   none
 */
static void pmcraid_initiate_reset(struct pmcraid_instance *);
static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);

static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_hcam_ldn *ldn_hcam =
			(struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
	u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
	u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
	unsigned long lock_flags;

	/* return the command block back to freepool */
	pinstance->ldn.cmd = NULL;
	pmcraid_return_cmd(cmd);

	/* If driver initiated IOA reset happened while this hcam was pending
	 * with IOA, no need to re-register the hcam as reset engine will do it
	 * once reset sequence is complete
	 */
	if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
	    atomic_read(&pinstance->ccn.ignore) == 1) {
		return;
	} else if (!ioasc) {
		pmcraid_handle_error_log(pinstance);
		if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
			spin_lock_irqsave(pinstance->host->host_lock,
					  lock_flags);
			pmcraid_initiate_reset(pinstance);
			spin_unlock_irqrestore(pinstance->host->host_lock,
					       lock_flags);
			return;
		}
		if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
			pinstance->timestamp_error = 1;
			pmcraid_set_timestamp(cmd);
		}
	} else {
		dev_info(&pinstance->pdev->dev,
			"Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
	}
	/* send netlink message for HCAM notification if enabled */
	if (!pmcraid_disable_aen)
		pmcraid_notify_ldn(pinstance);

	cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
	if (cmd)
		pmcraid_send_hcam_cmd(cmd);
}

/**
 * pmcraid_register_hcams - register HCAMs for CCN and LDN
 *
 * @pinstance: pointer per adapter instance structure
 *
 * Return Value
 *   none
 */
static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
{
	pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
	pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
}

/**
 * pmcraid_unregister_hcams - cancel HCAMs registered already
 * @cmd: pointer to command used as part of reset sequence
 */
static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;

	/* During IOA bringdown, HCAM gets fired and tasklet proceeds with
	 * handling hcam response though it is not necessary. In order to
	 * prevent this, set 'ignore', so that bring-down sequence doesn't
	 * re-send any more hcams
	 */
	atomic_set(&pinstance->ccn.ignore, 1);
	atomic_set(&pinstance->ldn.ignore, 1);

	/* If adapter reset was forced as part of runtime reset sequence,
	 * start the reset sequence. Reset will be triggered even in case
	 * IOA unit_check.
	 */
	if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
	     pinstance->ioa_unit_check) {
		pinstance->force_ioa_reset = 0;
		pinstance->ioa_unit_check = 0;
		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
		pmcraid_reset_alert(cmd);
		return;
	}

	/* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
	 * one after the other. So CCN cancellation will be triggered by
	 * pmcraid_cancel_ldn itself.
	 */
	pmcraid_cancel_ldn(cmd);
}

/**
 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
 * @pinstance: pointer to adapter instance structure
 * Return Value
 *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
 */
static void pmcraid_reinit_buffers(struct pmcraid_instance *);

static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
{
	u32 intrs;

	pmcraid_reinit_buffers(pinstance);
	intrs = pmcraid_read_interrupts(pinstance);

	pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);

	if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
		if (!pinstance->interrupt_mode) {
			iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
				pinstance->int_regs.
				ioa_host_interrupt_mask_reg);
			iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
				pinstance->int_regs.ioa_host_interrupt_clr_reg);
		}
		return 1;
	} else {
		return 0;
	}
}

/**
 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
 * @cmd : pointer to reset command block
 *
 * Return Value
 *	none
 */
static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u32 int_reg;
	u32 doorbell;

	/* There will be an interrupt when Transition to Operational bit is
	 * set so tasklet would execute next reset task. The timeout handler
	 * would re-initiate a reset
	 */
	cmd->cmd_done = pmcraid_ioa_reset;
	cmd->timer.expires = jiffies +
			     msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
	cmd->timer.function = pmcraid_timeout_handler;

	if (!timer_pending(&cmd->timer))
		add_timer(&cmd->timer);

	/* Enable destructive diagnostics on IOA if it is not yet in
	 * operational state
	 */
	doorbell = DOORBELL_RUNTIME_RESET |
		   DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;

	/* Since we do RESET_ALERT and Start BIST we have to again write
	 * MSIX Doorbell to indicate the interrupt mode
	 */
	if (pinstance->interrupt_mode) {
		iowrite32(DOORBELL_INTR_MODE_MSIX,
			  pinstance->int_regs.host_ioa_interrupt_reg);
		ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
	}

	iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
	ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
	int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);

	pmcraid_info("Waiting for IOA to become operational %x:%x\n",
		     ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
		     int_reg);
}

/**
 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return Value
 *	none
 */
static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
{
	pmcraid_info("%s is not yet implemented\n", __func__);
}

/**
 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
 * @pinstance: pointer to adapter instance structure
 *
 * This function fails all outstanding ops. If they are submitted to IOA
 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
 * otherwise just completes the commands and returns the cmd blocks to free
 * pool.
 *
 * Return value:
 *	 none
 */
static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
{
	struct pmcraid_cmd *cmd, *temp;
	unsigned long lock_flags;

	/* pending command list is protected by pending_pool_lock. Its
	 * traversal must be done as within this lock
	 */
	spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
	list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
				 free_list) {
		list_del(&cmd->free_list);
		spin_unlock_irqrestore(&pinstance->pending_pool_lock,
					lock_flags);
		cmd->ioa_cb->ioasa.ioasc =
			cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
		cmd->ioa_cb->ioasa.ilid =
			cpu_to_le32(PMCRAID_DRIVER_ILID);

		/* In case the command timer is still running */
		del_timer(&cmd->timer);

		/* If this is an IO command, complete it by invoking scsi_done
		 * function. If this is one of the internal commands other
		 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
		 * complete it
		 */
		if (cmd->scsi_cmd) {

			struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
			__le32 resp = cmd->ioa_cb->ioarcb.response_handle;

			scsi_cmd->result |= DID_ERROR << 16;

			scsi_dma_unmap(scsi_cmd);
			pmcraid_return_cmd(cmd);

			pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
				     le32_to_cpu(resp) >> 2,
				     cmd->ioa_cb->ioarcb.cdb[0],
				     scsi_cmd->result);
			scsi_cmd->scsi_done(scsi_cmd);
		} else if (cmd->cmd_done == pmcraid_internal_done ||
			   cmd->cmd_done == pmcraid_erp_done) {
			cmd->cmd_done(cmd);
		} else if (cmd->cmd_done != pmcraid_ioa_reset &&
			   cmd->cmd_done != pmcraid_ioa_shutdown_done) {
			pmcraid_return_cmd(cmd);
		}

		atomic_dec(&pinstance->outstanding_cmds);
		spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
	}

	spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
}

/**
 * pmcraid_ioa_reset - Implementation of IOA reset logic
 *
 * @cmd: pointer to the cmd block to be used for entire reset process
 *
 * This function executes most of the steps required for IOA reset. This gets
 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
 * 'eh_' thread. Access to variables used for controlling the reset sequence is
 * synchronized using host lock. Various functions called during reset process
 * would make use of a single command block, pointer to which is also stored in
 * adapter instance structure.
 *
 * Return Value
 *	 None
 */
static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
{
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	u8 reset_complete = 0;

	pinstance->ioa_reset_in_progress = 1;

	if (pinstance->reset_cmd != cmd) {
		pmcraid_err("reset is called with different command block\n");
		pinstance->reset_cmd = cmd;
	}

	pmcraid_info("reset_engine: state = %d, command = %p\n",
		      pinstance->ioa_state, cmd);

	switch (pinstance->ioa_state) {

	case IOA_STATE_DEAD:
		/* If IOA is offline, whatever may be the reset reason, just
		 * return. callers might be waiting on the reset wait_q, wake
		 * up them
		 */
		pmcraid_err("IOA is offline no reset is possible\n");
		reset_complete = 1;
		break;

	case IOA_STATE_IN_BRINGDOWN:
		/* we enter here, once ioa shutdown command is processed by IOA
		 * Alert IOA for a possible reset. If reset alert fails, IOA
		 * goes through hard-reset
		 */
		pmcraid_disable_interrupts(pinstance, ~0);
		pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
		pmcraid_reset_alert(cmd);
		break;

	case IOA_STATE_UNKNOWN:
		/* We may be called during probe or resume. Some pre-processing
		 * is required for prior to reset
		 */
		scsi_block_requests(pinstance->host);

		/* If asked to reset while IOA was processing responses or
		 * there are any error responses then IOA may require
		 * hard-reset.
		 */
		if (pinstance->ioa_hard_reset == 0) {
			if (ioread32(pinstance->ioa_status) &
			    INTRS_TRANSITION_TO_OPERATIONAL) {
				pmcraid_info("sticky bit set, bring-up\n");
				pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
				pmcraid_reinit_cmdblk(cmd);
				pmcraid_identify_hrrq(cmd);
			} else {
				pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
				pmcraid_soft_reset(cmd);
			}
		} else {
			/* Alert IOA of a possible reset and wait for critical
			 * operation in progress bit to reset
			 */
			pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
			pmcraid_reset_alert(cmd);
		}
		break;

	case IOA_STATE_IN_RESET_ALERT:
		/* If critical operation in progress bit is reset or wait gets
		 * timed out, reset proceeds with starting BIST on the IOA.
		 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
		 * they are 3 or more, reset engine marks IOA dead and returns
		 */
		pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
		pmcraid_start_bist(cmd);
		break;

	case IOA_STATE_IN_HARD_RESET:
		pinstance->ioa_reset_attempts++;

		/* retry reset if we haven't reached maximum allowed limit */
		if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
			pinstance->ioa_reset_attempts = 0;
			pmcraid_err("IOA didn't respond marking it as dead\n");
			pinstance->ioa_state = IOA_STATE_DEAD;

			if (pinstance->ioa_bringdown)
				pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
			else
				pmcraid_notify_ioastate(pinstance,
						PMC_DEVICE_EVENT_RESET_FAILED);
			reset_complete = 1;
			break;
		}

		/* Once either bist or pci reset is done, restore PCI config
		 * space. If this fails, proceed with hard reset again
		 */
		pci_restore_state(pinstance->pdev);

		/* fail all pending commands */
		pmcraid_fail_outstanding_cmds(pinstance);

		/* check if unit check is active, if so extract dump */
		if (pinstance->ioa_unit_check) {
			pmcraid_info("unit check is active\n");
			pinstance->ioa_unit_check = 0;
			pmcraid_get_dump(pinstance);
			pinstance->ioa_reset_attempts--;
			pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
			pmcraid_reset_alert(cmd);
			break;
		}

		/* if the reset reason is to bring-down the ioa, we might be
		 * done with the reset restore pci_config_space and complete
		 * the reset
		 */
		if (pinstance->ioa_bringdown) {
			pmcraid_info("bringing down the adapter\n");
			pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
			pinstance->ioa_bringdown = 0;
			pinstance->ioa_state = IOA_STATE_UNKNOWN;
			pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
			reset_complete = 1;
		} else {
			/* bring-up IOA, so proceed with soft reset
			 * Reinitialize hrrq_buffers and their indices also
			 * enable interrupts after a pci_restore_state
			 */
			if (pmcraid_reset_enable_ioa(pinstance)) {
				pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
				pmcraid_info("bringing up the adapter\n");
				pmcraid_reinit_cmdblk(cmd);
				pmcraid_identify_hrrq(cmd);
			} else {
				pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
				pmcraid_soft_reset(cmd);
			}
		}
		break;

	case IOA_STATE_IN_SOFT_RESET:
		/* TRANSITION TO OPERATIONAL is on so start initialization
		 * sequence
		 */
		pmcraid_info("In softreset proceeding with bring-up\n");
		pinstance->ioa_state = IOA_STATE_IN_BRINGUP;

		/* Initialization commands start with HRRQ identification. From
		 * now on tasklet completes most of the commands as IOA is up
		 * and intrs are enabled
		 */
		pmcraid_identify_hrrq(cmd);
		break;

	case IOA_STATE_IN_BRINGUP:
		/* we are done with bringing up of IOA, change the ioa_state to
		 * operational and wake up any waiters
		 */
		pinstance->ioa_state = IOA_STATE_OPERATIONAL;
		reset_complete = 1;
		break;

	case IOA_STATE_OPERATIONAL:
	default:
		/* When IOA is operational and a reset is requested, check for
		 * the reset reason. If reset is to bring down IOA, unregister
		 * HCAMs and initiate shutdown; if adapter reset is forced then
		 * restart reset sequence again
		 */
		if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
		    pinstance->force_ioa_reset == 0) {
			pmcraid_notify_ioastate(pinstance,
						PMC_DEVICE_EVENT_RESET_SUCCESS);
			reset_complete = 1;
		} else {
			if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
				pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
			pmcraid_reinit_cmdblk(cmd);
			pmcraid_unregister_hcams(cmd);
		}
		break;
	}

	/* reset will be completed if ioa_state is either DEAD or UNKNOWN or
	 * OPERATIONAL. Reset all control variables used during reset, wake up
	 * any waiting threads and let the SCSI mid-layer send commands. Note
	 * that host_lock must be held before invoking scsi_report_bus_reset.
	 */
	if (reset_complete) {
		pinstance->ioa_reset_in_progress = 0;
		pinstance->ioa_reset_attempts = 0;
		pinstance->reset_cmd = NULL;
		pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
		pinstance->ioa_bringdown = 0;
		pmcraid_return_cmd(cmd);

		/* If target state is to bring up the adapter, proceed with
		 * hcam registration and resource exposure to mid-layer.
		 */
		if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
			pmcraid_register_hcams(pinstance);

		wake_up_all(&pinstance->reset_wait_q);
	}

	return;
}

/**
 * pmcraid_initiate_reset - initiates reset sequence. This is called from
 * ISR/tasklet during error interrupts including IOA unit check. If reset
 * is already in progress, it just returns, otherwise initiates IOA reset
 * to bring IOA up to operational state.
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return value
 *	 none
 */
static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
{
	struct pmcraid_cmd *cmd;

	/* If the reset is already in progress, just return, otherwise start
	 * reset sequence and return
	 */
	if (!pinstance->ioa_reset_in_progress) {
		scsi_block_requests(pinstance->host);
		cmd = pmcraid_get_free_cmd(pinstance);

		if (cmd == NULL) {
			pmcraid_err("no cmnd blocks for initiate_reset\n");
			return;
		}

		pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
		pinstance->reset_cmd = cmd;
		pinstance->force_ioa_reset = 1;
		pmcraid_notify_ioastate(pinstance,
					PMC_DEVICE_EVENT_RESET_START);
		pmcraid_ioa_reset(cmd);
	}
}

/**
 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
 *			  or bringdown IOA
 * @pinstance: pointer adapter instance structure
 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
 * @target_state: expected target state after reset
 *
 * Note: This command initiates reset and waits for its completion. Hence this
 * should not be called from isr/timer/tasklet functions (timeout handlers,
 * error response handlers and interrupt handlers).
 *
 * Return Value
 *	 1 in case ioa_state is not target_state, 0 otherwise.
 */
static int pmcraid_reset_reload(
	struct pmcraid_instance *pinstance,
	u8 shutdown_type,
	u8 target_state
)
{
	struct pmcraid_cmd *reset_cmd = NULL;
	unsigned long lock_flags;
	int reset = 1;

	spin_lock_irqsave(pinstance->host->host_lock, lock_flags);

	if (pinstance->ioa_reset_in_progress) {
		pmcraid_info("reset_reload: reset is already in progress\n");

		spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);

		wait_event(pinstance->reset_wait_q,
			   !pinstance->ioa_reset_in_progress);

		spin_lock_irqsave(pinstance->host->host_lock, lock_flags);

		if (pinstance->ioa_state == IOA_STATE_DEAD) {
			pmcraid_info("reset_reload: IOA is dead\n");
			goto out_unlock;
		}

		if (pinstance->ioa_state == target_state) {
			reset = 0;
			goto out_unlock;
		}
	}

	pmcraid_info("reset_reload: proceeding with reset\n");
	scsi_block_requests(pinstance->host);
	reset_cmd = pmcraid_get_free_cmd(pinstance);
	if (reset_cmd == NULL) {
		pmcraid_err("no free cmnd for reset_reload\n");
		goto out_unlock;
	}

	if (shutdown_type == SHUTDOWN_NORMAL)
		pinstance->ioa_bringdown = 1;

	pinstance->ioa_shutdown_type = shutdown_type;
	pinstance->reset_cmd = reset_cmd;
	pinstance->force_ioa_reset = reset;
	pmcraid_info("reset_reload: initiating reset\n");
	pmcraid_ioa_reset(reset_cmd);
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	pmcraid_info("reset_reload: waiting for reset to complete\n");
	wait_event(pinstance->reset_wait_q,
		   !pinstance->ioa_reset_in_progress);

	pmcraid_info("reset_reload: reset is complete !!\n");
	scsi_unblock_requests(pinstance->host);
	return pinstance->ioa_state != target_state;

out_unlock:
	spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
	return reset;
}

/**
 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return Value
 *	 whatever is returned from pmcraid_reset_reload
 */
static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
{
	return pmcraid_reset_reload(pinstance,
				    SHUTDOWN_NORMAL,
				    IOA_STATE_UNKNOWN);
}

/**
 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
 *
 * @pinstance: pointer to adapter instance structure
 *
 * Return Value
 *	 whatever is returned from pmcraid_reset_reload
 */
static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
{
	pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);

	return pmcraid_reset_reload(pinstance,
				    SHUTDOWN_NONE,
				    IOA_STATE_OPERATIONAL);
}

/**
 * pmcraid_request_sense - Send request sense to a device
 * @cmd: pmcraid command struct
 *
 * This function sends a request sense to a device as a result of a check
 * condition. This method re-uses the same command block that failed earlier.
 */
static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
{
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
	struct device *dev = &cmd->drv_inst->pdev->dev;

	cmd->sense_buffer = cmd->scsi_cmd->sense_buffer;
	cmd->sense_buffer_dma = dma_map_single(dev, cmd->sense_buffer,
			SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
	if (dma_mapping_error(dev, cmd->sense_buffer_dma)) {
		pmcraid_err
			("couldn't allocate sense buffer for request sense\n");
		pmcraid_erp_done(cmd);
		return;
	}

	/* re-use the command block */
	memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
	ioarcb->request_flags0 = (SYNC_COMPLETE |
				  NO_LINK_DESCS |
				  INHIBIT_UL_CHECK);
	ioarcb->request_type = REQ_TYPE_SCSI;
	ioarcb->cdb[0] = REQUEST_SENSE;
	ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;

	ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
					offsetof(struct pmcraid_ioarcb,
						add_data.u.ioadl[0]));
	ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));

	ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);

	ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
	ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
	ioadl->flags = IOADL_FLAGS_LAST_DESC;

	/* request sense might be called as part of error response processing
	 * which runs in tasklets context. It is possible that mid-layer might
	 * schedule queuecommand during this time, hence, writting to IOARRIN
	 * must be protect by host_lock
	 */
	pmcraid_send_cmd(cmd, pmcraid_erp_done,
			 PMCRAID_REQUEST_SENSE_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
 * @cmd: command that failed
 * @need_sense: true if request_sense is required after cancel all
 *
 * This function sends a cancel all to a device to clear the queue.
 */
static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, bool need_sense)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
	struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;

	memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
	ioarcb->request_flags0 = SYNC_OVERRIDE;
	ioarcb->request_type = REQ_TYPE_IOACMD;
	ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;

	if (RES_IS_GSCSI(res->cfg_entry))
		ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;

	ioarcb->ioadl_bus_addr = 0;
	ioarcb->ioadl_length = 0;
	ioarcb->data_transfer_length = 0;
	ioarcb->ioarcb_bus_addr &= cpu_to_le64((~0x1FULL));

	/* writing to IOARRIN must be protected by host_lock, as mid-layer
	 * schedule queuecommand while we are doing this
	 */
	pmcraid_send_cmd(cmd, need_sense ?
			 pmcraid_erp_done : pmcraid_request_sense,
			 PMCRAID_REQUEST_SENSE_TIMEOUT,
			 pmcraid_timeout_handler);
}

/**
 * pmcraid_frame_auto_sense: frame fixed format sense information
 *
 * @cmd: pointer to failing command block
 *
 * Return value
 *  none
 */
static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
{
	u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
	struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
	struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
	u32 ioasc = le32_to_cpu(ioasa->ioasc);
	u32 failing_lba = 0;

	memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
	cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;

	if (RES_IS_VSET(res->cfg_entry) &&
	    ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
	    ioasa->u.vset.failing_lba_hi != 0) {

		sense_buf[0] = 0x72;
		sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
		sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
		sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);

		sense_buf[7] = 12;
		sense_buf[8] = 0;
		sense_buf[9] = 0x0A;
		sense_buf[10] = 0x80;

		failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);

		sense_buf[12] = (failing_lba & 0xff000000) >> 24;
		sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
		sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
		sense_buf[15] = failing_lba & 0x000000ff;

		failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);

		sense_buf[16] = (failing_lba & 0xff000000) >> 24;
		sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
		sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
		sense_buf[19] = failing_lba & 0x000000ff;
	} else {
		sense_buf[0] = 0x70;
		sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
		sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
		sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);

		if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
			if (RES_IS_VSET(res->cfg_entry))
				failing_lba =
					le32_to_cpu(ioasa->u.
						 vset.failing_lba_lo);
			sense_buf[0] |= 0x80;
			sense_buf[3] = (failing_lba >> 24) & 0xff;
			sense_buf[4] = (failing_lba >> 16) & 0xff;
			sense_buf[5] = (failing_lba >> 8) & 0xff;
			sense_buf[6] = failing_lba & 0xff;
		}

		sense_buf[7] = 6; /* additional length */
	}
}

/**
 * pmcraid_error_handler - Error response handlers for a SCSI op
 * @cmd: pointer to pmcraid_cmd that has failed
 *
 * This function determines whether or not to initiate ERP on the affected
 * device. This is called from a tasklet, which doesn't hold any locks.
 *
 * Return value:
 *	 0 it caller can complete the request, otherwise 1 where in error
 *	 handler itself completes the request and returns the command block
 *	 back to free-pool
 */
static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
{
	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
	struct pmcraid_instance *pinstance = cmd->drv_inst;
	struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
	u32 ioasc = le32_to_cpu(ioasa->ioasc);
	u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
	bool sense_copied = false;

	if (!res) {
		pmcraid_info("resource pointer is NULL\n");
		return 0;
	}

	/* If this was a SCSI read/write command keep count of errors */
	if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
		atomic_inc(&res->read_failures);
	else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
		atomic_inc(&res->write_failures);

	if (!RES_IS_GSCSI(res->cfg_entry) &&
		masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
		pmcraid_frame_auto_sense(cmd);
	}

	/* Log IOASC/IOASA information based on user settings */
	pmcraid_ioasc_logger(ioasc, cmd);

	switch (masked_ioasc) {


context:
space:
mode: