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/*
* 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 <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;
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[] __devinitdata = {
{ 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 = 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,
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);
}
if (scsi_dev->tagged_supported &&
(RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
scsi_dev->host->cmd_per_lun);
} else {
scsi_adjust_queue_depth(scsi_dev, 0,
scsi_dev->host->cmd_per_lun);
}
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
* @reason: calling context
*
* Return value
* actual depth set
*/
static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
int reason)
{
if (reason != SCSI_QDEPTH_DEFAULT)
return -EOPNOTSUPP;
if (depth > PMCRAID_MAX_CMD_PER_LUN)
depth = PMCRAID_MAX_CMD_PER_LUN;
scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
return scsi_dev->queue_depth;
}
/**
* pmcraid_change_queue_type - Change the device's queue type
* @scsi_dev: scsi device struct
* @tag: type of tags to use
*
* Return value:
* actual queue type set
*/
static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
{
struct pmcraid_resource_entry *res;
res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
if ((res) && scsi_dev->tagged_supported &&
(RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
scsi_set_tag_type(scsi_dev, tag);
if (tag)
scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
else
scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
} else
tag = 0;
return tag;
}
/**
* 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
*/
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 &= (~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 = 0;
cmd->sense_buffer_dma = 0;
cmd->dma_handle = 0;
init_timer(&cmd->timer);
}
/**
* 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
*/
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 pmcraid_cmd *cmd)
{
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;
cmd->timer.data = (unsigned long)cmd;
cmd->timer.function =
(void (*)(unsigned long))pmcraid_bist_done;
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.data = (unsigned long)cmd;
cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
cmd->timer.function = (void (*)(unsigned long))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 pmcraid_cmd *cmd)
{
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.data = (unsigned long)cmd;
cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
cmd->timer.function =
(void (*)(unsigned long))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.data = (unsigned long)cmd;
cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
cmd->timer.function =
(void (*)(unsigned long))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 pmcraid_cmd *cmd)
{
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 we had allocated sense buffers for request sense, copy the sense
* release the buffers
*/
if (cmd->sense_buffer != NULL) {
memcpy(scsi_cmd->sense_buffer,
cmd->sense_buffer,
SCSI_SENSE_BUFFERSIZE);
pci_free_consistent(pinstance->pdev,
SCSI_SENSE_BUFFERSIZE,
cmd->sense_buffer, cmd->sense_buffer_dma);
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(le32_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 pmcraid_cmd *)
)
{
/* initialize done function */
cmd->cmd_done = cmd_done;
if (timeout_func) {
/* setup timeout handler */
cmd->timer.data = (unsigned long)cmd;
cmd->timer.expires = jiffies + timeout;
cmd->timer.function = (void (*)(unsigned long))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 = ioarcb->add_data.u.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 &= ~(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]);
u32 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_le32(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 = 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;
/* 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(ioarcb_addr);
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_family pmcraid_event_family = {
.id = GENL_ID_GENERATE,
.name = "pmcraid",
.version = 1,
.maxattr = PMCRAID_AEN_ATTR_MAX
};
/**
* 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 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 */
result = genlmsg_end(skb, msg_header);
if (result < 0) {
pmcraid_err("genlmsg_end failed\n");
nlmsg_free(skb);
return result;
}
result =
genlmsg_multicast(skb, 0, pmcraid_event_family.id, 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,
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,
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",
pinstance->ccn.hcam->ilid,
pinstance->ccn.hcam->op_code,
((pinstance->ccn.hcam->timestamp1) |
((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 :
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) {
if (fw_version <= PMCRAID_FW_VERSION_1)
hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
else
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 &= 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'
*/
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],
cmd->ioa_cb->ioarcb.resource_handle,
le32_to_cpu(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.data = (unsigned long)cmd;
cmd->timer.expires = jiffies +
msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
cmd->timer.function = (void (*)(unsigned long))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_be32(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)) {