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linux/drivers/scsi/pmcraid.c
Anil Ravindranath 89a3681041 [SCSI] pmcraid: PMC-Sierra MaxRAID driver to support 6Gb/s SAS RAID controller 
Signed-off-by: Anil Ravindranath <anil_ravindranath@pmc-sierra.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-12 09:35:24 -05:00

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/*
* pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
*
* Written By: PMC Sierra Corporation
*
* 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/version.h>
#include <linux/io.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_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;
/*
* 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("PMC Sierra Corporation, 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_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;
pinstance = shost_priv(scsi_dev->host);
/* 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 >= 240 */
if (RES_IS_VSET(temp->cfg_entry)) {
target = temp->cfg_entry.unique_flags1;
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 fucntion 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_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
*
* 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;
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->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->u.time_left = 0;
}
cmd->cmd_done = NULL;
cmd->scsi_cmd = NULL;
cmd->release = 0;
cmd->completion_req = 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 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(nmask, pinstance->int_regs.global_interrupt_mask_reg);
iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
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);
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_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->u.time_left > 0) {
pmcraid_info("BIST not complete, waiting another 2 secs\n");
cmd->timer.expires = jiffies + cmd->u.time_left;
cmd->u.time_left = 0;
cmd->timer.data = (unsigned long)cmd;
cmd->timer.function =
(void (*)(unsigned long))pmcraid_bist_done;
add_timer(&cmd->timer);
} else {
cmd->u.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->u.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->u.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->u.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_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->u.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_err(&pinstance->pdev->dev,
"Adapter being reset due to command timeout.\n");
/* 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;
}
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);
pmcraid_err("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 cmb 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 - 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_send_cmd(cmd, pmcraid_ioa_reset,
PMCRAID_SHUTDOWN_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
* 0 in case of success, otherwise non-zero failure code
*/
static void pmcraid_querycfg(struct pmcraid_cmd *);
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 = 0;
__be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
pmcraid_reinit_cmdblk(cmd);
/* 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 => %llx:%llx\n",
hrrq_addr, ioarcb->ioarcb_bus_addr);
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, pmcraid_querycfg,
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);
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 |= cpu_to_le32(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
*
* @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(struct pmcraid_config_table_entry *cfgte)
{
int retval = 0;
if (cfgte->resource_type == RES_TYPE_VSET)
retval = ((cfgte->unique_flags1 & 0xFF) < 0xFE);
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, u8 type)
{
struct sk_buff *skb;
struct pmcraid_aen_msg *aen_msg;
void *msg_header;
int data_size, total_size;
int result;
if (type == PMCRAID_HCAM_CODE_LOG_DATA) {
aen_msg = pinstance->ldn.msg;
data_size = pinstance->ldn.hcam->data_len;
} else {
aen_msg = pinstance->ccn.msg;
data_size = pinstance->ccn.hcam->data_len;
}
data_size += sizeof(struct pmcraid_hcam_hdr);
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);
skb = genlmsg_new(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("failed to send %s event message %x!\n",
type == PMCRAID_HCAM_CODE_LOG_DATA ? "LDN" : "CCN",
result);
return result;
}
/**
* 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;
u32 new_entry = 1;
unsigned long lock_flags;
unsigned long host_lock_flags;
int rc;
ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
cfg_entry = &ccn_hcam->cfg_entry;
pmcraid_info
("CCN(%x): %x type: %x lost: %x flags: %x res: %x:%x:%x:%x\n",
pinstance->ccn.hcam->ilid,
pinstance->ccn.hcam->op_code,
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) ? cfg_entry->unique_flags1 :
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 (!pmcraid_expose_resource(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 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,
sizeof(struct pmcraid_config_table_entry));
if (pinstance->ccn.hcam->notification_type ==
NOTIFICATION_TYPE_ENTRY_DELETED) {
if (res->scsi_dev) {
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_aen(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
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 [%d] 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_err(&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_err(&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_err(&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_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;
}
} else {
dev_err(&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_aen(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
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.
*/
if (pinstance->force_ioa_reset && !pinstance->ioa_bringdown) {
pinstance->force_ioa_reset = 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) {
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;
iowrite32(doorbell, 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) {
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 controling 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;
reset_complete = 1;
break;
}
/* Once either bist or pci reset is done, restore PCI config
* space. If this fails, proceed with hard reset again
*/
if (pci_restore_state(pinstance->pdev)) {
pmcraid_info("config-space error resetting again\n");
pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
pmcraid_reset_alert(cmd);
break;
}
/* 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;
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) {
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_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) {
spin_unlock_irqrestore(pinstance->host->host_lock,
lock_flags);
pmcraid_info("reset_reload: IOA is dead\n");
return reset;
} else if (pinstance->ioa_state == target_state) {
reset = 0;
}
}
if (reset) {
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");
spin_unlock_irqrestore(pinstance->host->host_lock,
lock_flags);
return reset;
}
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);
if (pinstance->ioa_state == target_state)
reset = 0;
}
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)
{
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;
/* allocate DMAable memory for sense buffers */
cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
SCSI_SENSE_BUFFERSIZE,
&cmd->sense_buffer_dma);
if (cmd->sense_buffer == NULL) {
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 = cpu_to_le32(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
* @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, u32 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;
void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
: pmcraid_request_sense;
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 &= (~0x1FULL);
/* 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_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;
u32 sense_copied = 0;
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) {
case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
scsi_cmd->result |= (DID_ABORT << 16);
break;
case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
scsi_cmd->result |= (DID_NO_CONNECT << 16);
break;
case PMCRAID_IOASC_NR_SYNC_REQUIRED:
res->sync_reqd = 1;
scsi_cmd->result |= (DID_IMM_RETRY << 16);
break;
case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
scsi_cmd->result |= (DID_PASSTHROUGH << 16);
break;
case PMCRAID_IOASC_UA_BUS_WAS_RESET:
case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
if (!res->reset_progress)
scsi_report_bus_reset(pinstance->host,
scsi_cmd->device->channel);
scsi_cmd->result |= (DID_ERROR << 16);
break;
case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
res->sync_reqd = 1;
/* if check_condition is not active return with error otherwise
* get/frame the sense buffer
*/
if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
SAM_STAT_CHECK_CONDITION &&
PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
return 0;
/* If we have auto sense data as part of IOASA pass it to
* mid-layer
*/
if (ioasa->auto_sense_length != 0) {
short sense_len = ioasa->auto_sense_length;
int data_size = min_t(u16, le16_to_cpu(sense_len),
SCSI_SENSE_BUFFERSIZE);
memcpy(scsi_cmd->sense_buffer,
ioasa->sense_data,
data_size);
sense_copied = 1;
}
if (RES_IS_GSCSI(res->cfg_entry)) {
pmcraid_cancel_all(cmd, sense_copied);
} else if (sense_copied) {
pmcraid_erp_done(cmd);
return 0;
} else {
pmcraid_request_sense(cmd);
}
return 1;
case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
break;
default:
if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
scsi_cmd->result |= (DID_ERROR << 16);
break;
}
return 0;
}
/**
* pmcraid_reset_device - device reset handler functions
*
* @scsi_cmd: scsi command struct
* @modifier: reset modifier indicating the reset sequence to be performed
*
* This function issues a device reset to the affected device.
* A LUN reset will be sent to the device first. If that does
* not work, a target reset will be sent.
*
* Return value:
* SUCCESS / FAILED
*/
static int pmcraid_reset_device(
struct scsi_cmnd *scsi_cmd,
unsigned long timeout,
u8 modifier
)
{
struct pmcraid_cmd *cmd;
struct pmcraid_instance *pinstance;
struct pmcraid_resource_entry *res;
struct pmcraid_ioarcb *ioarcb;
unsigned long lock_flags;
u32 ioasc;
pinstance =
(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
res = scsi_cmd->device->hostdata;
if (!res) {
pmcraid_err("reset_device: NULL resource pointer\n");
return FAILED;
}
/* If adapter is currently going through reset/reload, return failed.
* This will force the mid-layer to call _eh_bus/host reset, which
* will then go to sleep and wait for the reset to complete
*/
spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
if (pinstance->ioa_reset_in_progress ||
pinstance->ioa_state == IOA_STATE_DEAD) {
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
return FAILED;
}
res->reset_progress = 1;
pmcraid_info("Resetting %s resource with addr %x\n",
((modifier & RESET_DEVICE_LUN) ? "LUN" :
((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
le32_to_cpu(res->cfg_entry.resource_address));
/* get a free cmd block */
cmd = pmcraid_get_free_cmd(pinstance);
if (cmd == NULL) {
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
pmcraid_err("%s: no cmd blocks are available\n", __func__);
return FAILED;
}
ioarcb = &cmd->ioa_cb->ioarcb;
ioarcb->resource_handle = res->cfg_entry.resource_handle;
ioarcb->request_type = REQ_TYPE_IOACMD;
ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
/* Initialize reset modifier bits */
if (modifier)
modifier = ENABLE_RESET_MODIFIER | modifier;
ioarcb->cdb[1] = modifier;
init_completion(&cmd->wait_for_completion);
cmd->completion_req = 1;
pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
cmd->ioa_cb->ioarcb.cdb[0],
le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
pmcraid_send_cmd(cmd,
pmcraid_internal_done,
timeout,
pmcraid_timeout_handler);
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
/* RESET_DEVICE command completes after all pending IOARCBs are
* completed. Once this command is completed, pmcraind_internal_done
* will wake up the 'completion' queue.
*/
wait_for_completion(&cmd->wait_for_completion);
/* complete the command here itself and return the command block
* to free list
*/
pmcraid_return_cmd(cmd);
res->reset_progress = 0;
ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
/* set the return value based on the returned ioasc */
return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
}
/**
* _pmcraid_io_done - helper for pmcraid_io_done function
*
* @cmd: pointer to pmcraid command struct
* @reslen: residual data length to be set in the ioasa
* @ioasc: ioasc either returned by IOA or set by driver itself.
*
* This function is invoked by pmcraid_io_done to complete mid-layer
* scsi ops.
*
* Return value:
* 0 if caller is required to return it to free_pool. Returns 1 if
* caller need not worry about freeing command block as error handler
* will take care of that.
*/
static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
{
struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
int rc = 0;
scsi_set_resid(scsi_cmd, reslen);
pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
cmd->ioa_cb->ioarcb.cdb[0],
ioasc, scsi_cmd->result);
if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
rc = pmcraid_error_handler(cmd);
if (rc == 0) {
scsi_dma_unmap(scsi_cmd);
scsi_cmd->scsi_done(scsi_cmd);
}
return rc;
}
/**
* pmcraid_io_done - SCSI completion function
*
* @cmd: pointer to pmcraid command struct
*
* This function is invoked by tasklet/mid-layer error handler to completing
* the SCSI ops sent from mid-layer.
*
* Return value
* none
*/
static void pmcraid_io_done(struct pmcraid_cmd *cmd)
{
u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
pmcraid_return_cmd(cmd);
}
/**
* pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
*
* @cmd: command block of the command to be aborted
*
* Return Value:
* returns pointer to command structure used as cancelling cmd
*/
static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
{
struct pmcraid_cmd *cancel_cmd;
struct pmcraid_instance *pinstance;
struct pmcraid_resource_entry *res;
pinstance = (struct pmcraid_instance *)cmd->drv_inst;
res = cmd->scsi_cmd->device->hostdata;
cancel_cmd = pmcraid_get_free_cmd(pinstance);
if (cancel_cmd == NULL) {
pmcraid_err("%s: no cmd blocks are available\n", __func__);
return NULL;
}
pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
cmd->ioa_cb->ioarcb.cdb[0],
cmd->ioa_cb->ioarcb.response_handle >> 2);
init_completion(&cancel_cmd->wait_for_completion);
cancel_cmd->completion_req = 1;
pmcraid_info("command (%d) CDB[0] = %x for %x\n",
le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
cmd->ioa_cb->ioarcb.cdb[0],
le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
pmcraid_send_cmd(cancel_cmd,
pmcraid_internal_done,
PMCRAID_INTERNAL_TIMEOUT,
pmcraid_timeout_handler);
return cancel_cmd;
}
/**
* pmcraid_abort_complete - Waits for ABORT TASK completion
*
* @cancel_cmd: command block use as cancelling command
*
* Return Value:
* returns SUCCESS if ABORT TASK has good completion
* otherwise FAILED
*/
static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
{
struct pmcraid_resource_entry *res;
u32 ioasc;
wait_for_completion(&cancel_cmd->wait_for_completion);
res = cancel_cmd->u.res;
cancel_cmd->u.res = NULL;
ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
/* If the abort task is not timed out we will get a Good completion
* as sense_key, otherwise we may get one the following responses
* due to subsquent bus reset or device reset. In case IOASC is
* NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
*/
if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
res->sync_reqd = 1;
ioasc = 0;
}
/* complete the command here itself */
pmcraid_return_cmd(cancel_cmd);
return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
}
/**
* pmcraid_eh_abort_handler - entry point for aborting a single task on errors
*
* @scsi_cmd: scsi command struct given by mid-layer. When this is called
* mid-layer ensures that no other commands are queued. This
* never gets called under interrupt, but a separate eh thread.
*
* Return value:
* SUCCESS / FAILED
*/
static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
{
struct pmcraid_instance *pinstance;
struct pmcraid_cmd *cmd;
struct pmcraid_resource_entry *res;
unsigned long host_lock_flags;
unsigned long pending_lock_flags;
struct pmcraid_cmd *cancel_cmd = NULL;
int cmd_found = 0;
int rc = FAILED;
pinstance =
(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
dev_err(&pinstance->pdev->dev,
"I/O command timed out, aborting it.\n");
res = scsi_cmd->device->hostdata;
if (res == NULL)
return rc;
/* If we are currently going through reset/reload, return failed.
* This will force the mid-layer to eventually call
* pmcraid_eh_host_reset which will then go to sleep and wait for the
* reset to complete
*/
spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
if (pinstance->ioa_reset_in_progress ||
pinstance->ioa_state == IOA_STATE_DEAD) {
spin_unlock_irqrestore(pinstance->host->host_lock,
host_lock_flags);
return rc;
}
/* loop over pending cmd list to find cmd corresponding to this
* scsi_cmd. Note that this command might not have been completed
* already. locking: all pending commands are protected with
* pending_pool_lock.
*/
spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
if (cmd->scsi_cmd == scsi_cmd) {
cmd_found = 1;
break;
}
}
spin_unlock_irqrestore(&pinstance->pending_pool_lock,
pending_lock_flags);
/* If the command to be aborted was given to IOA and still pending with
* it, send ABORT_TASK to abort this and wait for its completion
*/
if (cmd_found)
cancel_cmd = pmcraid_abort_cmd(cmd);
spin_unlock_irqrestore(pinstance->host->host_lock,
host_lock_flags);
if (cancel_cmd) {
cancel_cmd->u.res = cmd->scsi_cmd->device->hostdata;
rc = pmcraid_abort_complete(cancel_cmd);
}
return cmd_found ? rc : SUCCESS;
}
/**
* pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
*
* @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
*
* All these routines invokve pmcraid_reset_device with appropriate parameters.
* Since these are called from mid-layer EH thread, no other IO will be queued
* to the resource being reset. However, control path (IOCTL) may be active so
* it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
* takes care by locking/unlocking host_lock.
*
* Return value
* SUCCESS or FAILED
*/
static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
{
pmcraid_err("Doing device reset due to an I/O command timeout.\n");
return pmcraid_reset_device(scmd,
PMCRAID_INTERNAL_TIMEOUT,
RESET_DEVICE_LUN);
}
static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
{
pmcraid_err("Doing bus reset due to an I/O command timeout.\n");
return pmcraid_reset_device(scmd,
PMCRAID_RESET_BUS_TIMEOUT,
RESET_DEVICE_BUS);
}
static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
{
pmcraid_err("Doing target reset due to an I/O command timeout.\n");
return pmcraid_reset_device(scmd,
PMCRAID_INTERNAL_TIMEOUT,
RESET_DEVICE_TARGET);
}
/**
* pmcraid_eh_host_reset_handler - adapter reset handler callback
*
* @scmd: pointer to scsi_cmd that was sent to a resource of adapter
*
* Initiates adapter reset to bring it up to operational state
*
* Return value
* SUCCESS or FAILED
*/
static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
{
unsigned long interval = 10000; /* 10 seconds interval */
int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
struct pmcraid_instance *pinstance =
(struct pmcraid_instance *)(scmd->device->host->hostdata);
/* wait for an additional 150 seconds just in case firmware could come
* up and if it could complete all the pending commands excluding the
* two HCAM (CCN and LDN).
*/
while (waits--) {
if (atomic_read(&pinstance->outstanding_cmds) <=
PMCRAID_MAX_HCAM_CMD)
return SUCCESS;
msleep(interval);
}
dev_err(&pinstance->pdev->dev,
"Adapter being reset due to an I/O command timeout.\n");
return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
}
/**
* pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
* @scsi_cmd: scsi command struct
*
* Return value
* number of tags or 0 if the task is not tagged
*/
static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
{
char tag[2];
u8 rc = 0;
if (scsi_populate_tag_msg(scsi_cmd, tag)) {
switch (tag[0]) {
case MSG_SIMPLE_TAG:
rc = TASK_TAG_SIMPLE;
break;
case MSG_HEAD_TAG:
rc = TASK_TAG_QUEUE_HEAD;
break;
case MSG_ORDERED_TAG:
rc = TASK_TAG_ORDERED;
break;
};
}
return rc;
}
/**
* pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
* @cmd: pmcraid command struct
* @sgcount: count of scatter-gather elements
*
* Return value
* returns pointer pmcraid_ioadl_desc, initialized to point to internal
* or external IOADLs
*/
struct pmcraid_ioadl_desc *
pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
{
struct pmcraid_ioadl_desc *ioadl;
struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
int ioadl_count = 0;
if (ioarcb->add_cmd_param_length)
ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
ioarcb->ioadl_length =
sizeof(struct pmcraid_ioadl_desc) * sgcount;
if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
/* external ioadls start at offset 0x80 from control_block
* structure, re-using 24 out of 27 ioadls part of IOARCB.
* It is necessary to indicate to firmware that driver is
* using ioadls to be treated as external to IOARCB.
*/
ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
ioarcb->ioadl_bus_addr =
cpu_to_le64((cmd->ioa_cb_bus_addr) +
offsetof(struct pmcraid_ioarcb,
add_data.u.ioadl[3]));
ioadl = &ioarcb->add_data.u.ioadl[3];
} else {
ioarcb->ioadl_bus_addr =
cpu_to_le64((cmd->ioa_cb_bus_addr) +
offsetof(struct pmcraid_ioarcb,
add_data.u.ioadl[ioadl_count]));
ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
ioarcb->ioarcb_bus_addr |=
DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
}
return ioadl;
}
/**
* pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
* @pinstance: pointer to adapter instance structure
* @cmd: pmcraid command struct
*
* This function is invoked by queuecommand entry point while sending a command
* to firmware. This builds ioadl descriptors and sets up ioarcb fields.
*
* Return value:
* 0 on success or -1 on failure
*/
static int pmcraid_build_ioadl(
struct pmcraid_instance *pinstance,
struct pmcraid_cmd *cmd
)
{
int i, nseg;
struct scatterlist *sglist;
struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
u32 length = scsi_bufflen(scsi_cmd);
if (!length)
return 0;
nseg = scsi_dma_map(scsi_cmd);
if (nseg < 0) {
dev_err(&pinstance->pdev->dev, "scsi_map_dma failed!\n");
return -1;
} else if (nseg > PMCRAID_MAX_IOADLS) {
scsi_dma_unmap(scsi_cmd);
dev_err(&pinstance->pdev->dev,
"sg count is (%d) more than allowed!\n", nseg);
return -1;
}
/* Initialize IOARCB data transfer length fields */
if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
ioarcb->request_flags0 |= NO_LINK_DESCS;
ioarcb->data_transfer_length = cpu_to_le32(length);
ioadl = pmcraid_init_ioadls(cmd, nseg);
/* Initialize IOADL descriptor addresses */
scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
ioadl[i].flags = 0;
}
/* setup last descriptor */
ioadl[i - 1].flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
return 0;
}
/**
* pmcraid_free_sglist - Frees an allocated SG buffer list
* @sglist: scatter/gather list pointer
*
* Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
*
* Return value:
* none
*/
static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
{
int i;
for (i = 0; i < sglist->num_sg; i++)
__free_pages(sg_page(&(sglist->scatterlist[i])),
sglist->order);
kfree(sglist);
}
/**
* pmcraid_alloc_sglist - Allocates memory for a SG list
* @buflen: buffer length
*
* Allocates a DMA'able buffer in chunks and assembles a scatter/gather
* list.
*
* Return value
* pointer to sglist / NULL on failure
*/
static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
{
struct pmcraid_sglist *sglist;
struct scatterlist *scatterlist;
struct page *page;
int num_elem, i, j;
int sg_size;
int order;
int bsize_elem;
sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
order = (sg_size > 0) ? get_order(sg_size) : 0;
bsize_elem = PAGE_SIZE * (1 << order);
/* Determine the actual number of sg entries needed */
if (buflen % bsize_elem)
num_elem = (buflen / bsize_elem) + 1;
else
num_elem = buflen / bsize_elem;
/* Allocate a scatter/gather list for the DMA */
sglist = kzalloc(sizeof(struct pmcraid_sglist) +
(sizeof(struct scatterlist) * (num_elem - 1)),
GFP_KERNEL);
if (sglist == NULL)
return NULL;
scatterlist = sglist->scatterlist;
sg_init_table(scatterlist, num_elem);
sglist->order = order;
sglist->num_sg = num_elem;
sg_size = buflen;
for (i = 0; i < num_elem; i++) {
page = alloc_pages(GFP_KERNEL|GFP_DMA, order);
if (!page) {
for (j = i - 1; j >= 0; j--)
__free_pages(sg_page(&scatterlist[j]), order);
kfree(sglist);
return NULL;
}
sg_set_page(&scatterlist[i], page,
sg_size < bsize_elem ? sg_size : bsize_elem, 0);
sg_size -= bsize_elem;
}
return sglist;
}
/**
* pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
* @sglist: scatter/gather list pointer
* @buffer: buffer pointer
* @len: buffer length
* @direction: data transfer direction
*
* Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
*
* Return value:
* 0 on success / other on failure
*/
static int pmcraid_copy_sglist(
struct pmcraid_sglist *sglist,
unsigned long buffer,
u32 len,
int direction
)
{
struct scatterlist *scatterlist;
void *kaddr;
int bsize_elem;
int i;
int rc = 0;
/* Determine the actual number of bytes per element */
bsize_elem = PAGE_SIZE * (1 << sglist->order);
scatterlist = sglist->scatterlist;
for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
rc = __copy_from_user(kaddr,
(void *)buffer,
bsize_elem);
else
rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
kunmap(page);
if (rc) {
pmcraid_err("failed to copy user data into sg list\n");
return -EFAULT;
}
scatterlist[i].length = bsize_elem;
}
if (len % bsize_elem) {
struct page *page = sg_page(&scatterlist[i]);
kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
rc = __copy_from_user(kaddr,
(void *)buffer,
len % bsize_elem);
else
rc = __copy_to_user((void *)buffer,
kaddr,
len % bsize_elem);
kunmap(page);
scatterlist[i].length = len % bsize_elem;
}
if (rc) {
pmcraid_err("failed to copy user data into sg list\n");
rc = -EFAULT;
}
return rc;
}
/**
* pmcraid_queuecommand - Queue a mid-layer request
* @scsi_cmd: scsi command struct
* @done: done function
*
* This function queues a request generated by the mid-layer. Midlayer calls
* this routine within host->lock. Some of the functions called by queuecommand
* would use cmd block queue locks (free_pool_lock and pending_pool_lock)
*
* Return value:
* 0 on success
* SCSI_MLQUEUE_DEVICE_BUSY if device is busy
* SCSI_MLQUEUE_HOST_BUSY if host is busy
*/
static int pmcraid_queuecommand(
struct scsi_cmnd *scsi_cmd,
void (*done) (struct scsi_cmnd *)
)
{
struct pmcraid_instance *pinstance;
struct pmcraid_resource_entry *res;
struct pmcraid_ioarcb *ioarcb;
struct pmcraid_cmd *cmd;
int rc = 0;
pinstance =
(struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
scsi_cmd->scsi_done = done;
res = scsi_cmd->device->hostdata;
scsi_cmd->result = (DID_OK << 16);
/* if adapter is marked as dead, set result to DID_NO_CONNECT complete
* the command
*/
if (pinstance->ioa_state == IOA_STATE_DEAD) {
pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
scsi_cmd->result = (DID_NO_CONNECT << 16);
scsi_cmd->scsi_done(scsi_cmd);
return 0;
}
/* If IOA reset is in progress, can't queue the commands */
if (pinstance->ioa_reset_in_progress)
return SCSI_MLQUEUE_HOST_BUSY;
/* initialize the command and IOARCB to be sent to IOA */
cmd = pmcraid_get_free_cmd(pinstance);
if (cmd == NULL) {
pmcraid_err("free command block is not available\n");
return SCSI_MLQUEUE_HOST_BUSY;
}
cmd->scsi_cmd = scsi_cmd;
ioarcb = &(cmd->ioa_cb->ioarcb);
memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
ioarcb->resource_handle = res->cfg_entry.resource_handle;
ioarcb->request_type = REQ_TYPE_SCSI;
cmd->cmd_done = pmcraid_io_done;
if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
if (scsi_cmd->underflow == 0)
ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
if (res->sync_reqd) {
ioarcb->request_flags0 |= SYNC_COMPLETE;
res->sync_reqd = 0;
}
ioarcb->request_flags0 |= NO_LINK_DESCS;
ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
if (RES_IS_GSCSI(res->cfg_entry))
ioarcb->request_flags1 |= DELAY_AFTER_RESET;
}
rc = pmcraid_build_ioadl(pinstance, cmd);
pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
le32_to_cpu(ioarcb->response_handle) >> 2,
scsi_cmd->cmnd[0], pinstance->host->unique_id,
RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
PMCRAID_PHYS_BUS_ID,
RES_IS_VSET(res->cfg_entry) ?
res->cfg_entry.unique_flags1 :
RES_TARGET(res->cfg_entry.resource_address),
RES_LUN(res->cfg_entry.resource_address));
if (likely(rc == 0)) {
_pmcraid_fire_command(cmd);
} else {
pmcraid_err("queuecommand could not build ioadl\n");
pmcraid_return_cmd(cmd);
rc = SCSI_MLQUEUE_HOST_BUSY;
}
return rc;
}
/**
* pmcraid_open -char node "open" entry, allowed only users with admin access
*/
static int pmcraid_chr_open(struct inode *inode, struct file *filep)
{
struct pmcraid_instance *pinstance;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
/* Populate adapter instance * pointer for use by ioctl */
pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
filep->private_data = pinstance;
return 0;
}
/**
* pmcraid_release - char node "release" entry point
*/
static int pmcraid_chr_release(struct inode *inode, struct file *filep)
{
struct pmcraid_instance *pinstance =
((struct pmcraid_instance *)filep->private_data);
filep->private_data = NULL;
fasync_helper(-1, filep, 0, &pinstance->aen_queue);
return 0;
}
/**
* pmcraid_fasync - Async notifier registration from applications
*
* This function adds the calling process to a driver global queue. When an
* event occurs, SIGIO will be sent to all processes in this queue.
*/
static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
{
struct pmcraid_instance *pinstance;
int rc;
pinstance = (struct pmcraid_instance *)filep->private_data;
mutex_lock(&pinstance->aen_queue_lock);
rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
mutex_unlock(&pinstance->aen_queue_lock);
return rc;
}
/**
* pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
* commands sent over IOCTL interface
*
* @cmd : pointer to struct pmcraid_cmd
* @buflen : length of the request buffer
* @direction : data transfer direction
*
* Return value
* 0 on sucess, non-zero error code on failure
*/
static int pmcraid_build_passthrough_ioadls(
struct pmcraid_cmd *cmd,
int buflen,
int direction
)
{
struct pmcraid_sglist *sglist = NULL;
struct scatterlist *sg = NULL;
struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
struct pmcraid_ioadl_desc *ioadl;
int i;
sglist = pmcraid_alloc_sglist(buflen);
if (!sglist) {
pmcraid_err("can't allocate memory for passthrough SGls\n");
return -ENOMEM;
}
sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
sglist->scatterlist,
sglist->num_sg, direction);
if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
dev_err(&cmd->drv_inst->pdev->dev,
"Failed to map passthrough buffer!\n");
pmcraid_free_sglist(sglist);
return -EIO;
}
cmd->sglist = sglist;
ioarcb->request_flags0 |= NO_LINK_DESCS;
ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
/* Initialize IOADL descriptor addresses */
for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
ioadl[i].flags = 0;
}
/* setup the last descriptor */
ioadl[i - 1].flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
return 0;
}
/**
* pmcraid_release_passthrough_ioadls - release passthrough ioadls
*
* @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
* @buflen: size of the request buffer
* @direction: data transfer direction
*
* Return value
* 0 on sucess, non-zero error code on failure
*/
static void pmcraid_release_passthrough_ioadls(
struct pmcraid_cmd *cmd,
int buflen,
int direction
)
{
struct pmcraid_sglist *sglist = cmd->sglist;
if (buflen > 0) {
pci_unmap_sg(cmd->drv_inst->pdev,
sglist->scatterlist,
sglist->num_sg,
direction);
pmcraid_free_sglist(sglist);
cmd->sglist = NULL;
}
}
/**
* pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
*
* @pinstance: pointer to adapter instance structure
* @cmd: ioctl code
* @arg: pointer to pmcraid_passthrough_buffer user buffer
*
* Return value
* 0 on sucess, non-zero error code on failure
*/
static long pmcraid_ioctl_passthrough(
struct pmcraid_instance *pinstance,
unsigned int ioctl_cmd,
unsigned int buflen,
unsigned long arg
)
{
struct pmcraid_passthrough_ioctl_buffer *buffer;
struct pmcraid_ioarcb *ioarcb;
struct pmcraid_cmd *cmd;
struct pmcraid_cmd *cancel_cmd;
unsigned long request_buffer;
unsigned long request_offset;
unsigned long lock_flags;
int request_size;
int buffer_size;
u8 access, direction;
int rc = 0;
/* If IOA reset is in progress, wait 10 secs for reset to complete */
if (pinstance->ioa_reset_in_progress) {
rc = wait_event_interruptible_timeout(
pinstance->reset_wait_q,
!pinstance->ioa_reset_in_progress,
msecs_to_jiffies(10000));
if (!rc)
return -ETIMEDOUT;
else if (rc < 0)
return -ERESTARTSYS;
}
/* If adapter is not in operational state, return error */
if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
pmcraid_err("IOA is not operational\n");
return -ENOTTY;
}
buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!buffer) {
pmcraid_err("no memory for passthrough buffer\n");
return -ENOMEM;
}
request_offset =
offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
request_buffer = arg + request_offset;
rc = __copy_from_user(buffer,
(struct pmcraid_passthrough_ioctl_buffer *) arg,
sizeof(struct pmcraid_passthrough_ioctl_buffer));
if (rc) {
pmcraid_err("ioctl: can't copy passthrough buffer\n");
rc = -EFAULT;
goto out_free_buffer;
}
request_size = buffer->ioarcb.data_transfer_length;
if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
access = VERIFY_READ;
direction = DMA_TO_DEVICE;
} else {
access = VERIFY_WRITE;
direction = DMA_FROM_DEVICE;
}
if (request_size > 0) {
rc = access_ok(access, arg, request_offset + request_size);
if (!rc) {
rc = -EFAULT;
goto out_free_buffer;
}
}
/* check if we have any additional command parameters */
if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
rc = -EINVAL;
goto out_free_buffer;
}
cmd = pmcraid_get_free_cmd(pinstance);
if (!cmd) {
pmcraid_err("free command block is not available\n");
rc = -ENOMEM;
goto out_free_buffer;
}
cmd->scsi_cmd = NULL;
ioarcb = &(cmd->ioa_cb->ioarcb);
/* Copy the user-provided IOARCB stuff field by field */
ioarcb->resource_handle = buffer->ioarcb.resource_handle;
ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
ioarcb->request_type = buffer->ioarcb.request_type;
ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
if (buffer->ioarcb.add_cmd_param_length) {
ioarcb->add_cmd_param_length =
buffer->ioarcb.add_cmd_param_length;
ioarcb->add_cmd_param_offset =
buffer->ioarcb.add_cmd_param_offset;
memcpy(ioarcb->add_data.u.add_cmd_params,
buffer->ioarcb.add_data.u.add_cmd_params,
buffer->ioarcb.add_cmd_param_length);
}
if (request_size) {
rc = pmcraid_build_passthrough_ioadls(cmd,
request_size,
direction);
if (rc) {
pmcraid_err("couldn't build passthrough ioadls\n");
goto out_free_buffer;
}
}
/* If data is being written into the device, copy the data from user
* buffers
*/
if (direction == DMA_TO_DEVICE && request_size > 0) {
rc = pmcraid_copy_sglist(cmd->sglist,
request_buffer,
request_size,
direction);
if (rc) {
pmcraid_err("failed to copy user buffer\n");
goto out_free_sglist;
}
}
/* passthrough ioctl is a blocking command so, put the user to sleep
* until timeout. Note that a timeout value of 0 means, do timeout.
*/
cmd->cmd_done = pmcraid_internal_done;
init_completion(&cmd->wait_for_completion);
cmd->completion_req = 1;
pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
cmd->ioa_cb->ioarcb.cdb[0],
le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
_pmcraid_fire_command(cmd);
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
/* If command timeout is specified put caller to wait till that time,
* otherwise it would be blocking wait. If command gets timed out, it
* will be aborted.
*/
if (buffer->ioarcb.cmd_timeout == 0) {
wait_for_completion(&cmd->wait_for_completion);
} else if (!wait_for_completion_timeout(
&cmd->wait_for_completion,
msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
cmd->ioa_cb->ioarcb.cdb[0]);
rc = -ETIMEDOUT;
spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
cancel_cmd = pmcraid_abort_cmd(cmd);
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
if (cancel_cmd) {
wait_for_completion(&cancel_cmd->wait_for_completion);
pmcraid_return_cmd(cancel_cmd);
}
goto out_free_sglist;
}
/* If the command failed for any reason, copy entire IOASA buffer and
* return IOCTL success. If copying IOASA to user-buffer fails, return
* EFAULT
*/
if (le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)) {
void *ioasa =
(void *)(arg +
offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
pmcraid_info("command failed with %x\n",
le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
sizeof(struct pmcraid_ioasa))) {
pmcraid_err("failed to copy ioasa buffer to user\n");
rc = -EFAULT;
}
}
/* If the data transfer was from device, copy the data onto user
* buffers
*/
else if (direction == DMA_FROM_DEVICE && request_size > 0) {
rc = pmcraid_copy_sglist(cmd->sglist,
request_buffer,
request_size,
direction);
if (rc) {
pmcraid_err("failed to copy user buffer\n");
rc = -EFAULT;
}
}
out_free_sglist:
pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
pmcraid_return_cmd(cmd);
out_free_buffer:
kfree(buffer);
return rc;
}
/**
* pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
*
* @pinstance: pointer to adapter instance structure
* @cmd: ioctl command passed in
* @buflen: length of user_buffer
* @user_buffer: user buffer pointer
*
* Return Value
* 0 in case of success, otherwise appropriate error code
*/
static long pmcraid_ioctl_driver(
struct pmcraid_instance *pinstance,
unsigned int cmd,
unsigned int buflen,
void __user *user_buffer
)
{
int rc = -ENOSYS;
if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
pmcraid_err("ioctl_driver: access fault in request buffer \n");
return -EFAULT;
}
switch (cmd) {
case PMCRAID_IOCTL_RESET_ADAPTER:
pmcraid_reset_bringup(pinstance);
rc = 0;
break;
default:
break;
}
return rc;
}
/**
* pmcraid_check_ioctl_buffer - check for proper access to user buffer
*
* @cmd: ioctl command
* @arg: user buffer
* @hdr: pointer to kernel memory for pmcraid_ioctl_header
*
* Return Value
* negetive error code if there are access issues, otherwise zero.
* Upon success, returns ioctl header copied out of user buffer.
*/
static int pmcraid_check_ioctl_buffer(
int cmd,
void __user *arg,
struct pmcraid_ioctl_header *hdr
)
{
int rc = 0;
int access = VERIFY_READ;
if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
pmcraid_err("couldn't copy ioctl header from user buffer\n");
return -EFAULT;
}
/* check for valid driver signature */
rc = memcmp(hdr->signature,
PMCRAID_IOCTL_SIGNATURE,
sizeof(hdr->signature));
if (rc) {
pmcraid_err("signature verification failed\n");
return -EINVAL;
}
/* buffer length can't be negetive */
if (hdr->buffer_length < 0) {
pmcraid_err("ioctl: invalid buffer length specified\n");
return -EINVAL;
}
/* check for appropriate buffer access */
if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
access = VERIFY_WRITE;
rc = access_ok(access,
(arg + sizeof(struct pmcraid_ioctl_header)),
hdr->buffer_length);
if (!rc) {
pmcraid_err("access failed for user buffer of size %d\n",
hdr->buffer_length);
return -EFAULT;
}
return 0;
}
/**
* pmcraid_ioctl - char node ioctl entry point
*/
static long pmcraid_chr_ioctl(
struct file *filep,
unsigned int cmd,
unsigned long arg
)
{
struct pmcraid_instance *pinstance = NULL;
struct pmcraid_ioctl_header *hdr = NULL;
int retval = -ENOTTY;
hdr = kmalloc(GFP_KERNEL, sizeof(struct pmcraid_ioctl_header));
if (!hdr) {
pmcraid_err("faile to allocate memory for ioctl header\n");
return -ENOMEM;
}
retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
if (retval) {
pmcraid_info("chr_ioctl: header check failed\n");
kfree(hdr);
return retval;
}
pinstance = (struct pmcraid_instance *)filep->private_data;
if (!pinstance) {
pmcraid_info("adapter instance is not found\n");
kfree(hdr);
return -ENOTTY;
}
switch (_IOC_TYPE(cmd)) {
case PMCRAID_PASSTHROUGH_IOCTL:
/* If ioctl code is to download microcode, we need to block
* mid-layer requests.
*/
if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
scsi_block_requests(pinstance->host);
retval = pmcraid_ioctl_passthrough(pinstance,
cmd,
hdr->buffer_length,
arg);
if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
scsi_unblock_requests(pinstance->host);
break;
case PMCRAID_DRIVER_IOCTL:
arg += sizeof(struct pmcraid_ioctl_header);
retval = pmcraid_ioctl_driver(pinstance,
cmd,
hdr->buffer_length,
(void __user *)arg);
break;
default:
retval = -ENOTTY;
break;
}
kfree(hdr);
return retval;
}
/**
* File operations structure for management interface
*/
static const struct file_operations pmcraid_fops = {
.owner = THIS_MODULE,
.open = pmcraid_chr_open,
.release = pmcraid_chr_release,
.fasync = pmcraid_chr_fasync,
.unlocked_ioctl = pmcraid_chr_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = pmcraid_chr_ioctl,
#endif
};
/**
* pmcraid_show_log_level - Display adapter's error logging level
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
*/
static ssize_t pmcraid_show_log_level(
struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct pmcraid_instance *pinstance =
(struct pmcraid_instance *)shost->hostdata;
return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
}
/**
* pmcraid_store_log_level - Change the adapter's error logging level
* @dev: class device struct
* @buf: buffer
* @count: not used
*
* Return value:
* number of bytes printed to buffer
*/
static ssize_t pmcraid_store_log_level(
struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count
)
{
struct Scsi_Host *shost;
struct pmcraid_instance *pinstance;
unsigned long val;
if (strict_strtoul(buf, 10, &val))
return -EINVAL;
/* log-level should be from 0 to 2 */
if (val > 2)
return -EINVAL;
shost = class_to_shost(dev);
pinstance = (struct pmcraid_instance *)shost->hostdata;
pinstance->current_log_level = val;
return strlen(buf);
}
static struct device_attribute pmcraid_log_level_attr = {
.attr = {
.name = "log_level",
.mode = S_IRUGO | S_IWUSR,
},
.show = pmcraid_show_log_level,
.store = pmcraid_store_log_level,
};
/**
* pmcraid_show_drv_version - Display driver version
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
*/
static ssize_t pmcraid_show_drv_version(
struct device *dev,
struct device_attribute *attr,
char *buf
)
{
return snprintf(buf, PAGE_SIZE, "version: %s, build date: %s\n",
PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE);
}
static struct device_attribute pmcraid_driver_version_attr = {
.attr = {
.name = "drv_version",
.mode = S_IRUGO,
},
.show = pmcraid_show_drv_version,
};
/**
* pmcraid_show_io_adapter_id - Display driver assigned adapter id
* @dev: class device struct
* @buf: buffer
*
* Return value:
* number of bytes printed to buffer
*/
static ssize_t pmcraid_show_adapter_id(
struct device *dev,
struct device_attribute *attr,
char *buf
)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct pmcraid_instance *pinstance =
(struct pmcraid_instance *)shost->hostdata;
u32 adapter_id = (pinstance->pdev->bus->number << 8) |
pinstance->pdev->devfn;
u32 aen_group = pmcraid_event_family.id;
return snprintf(buf, PAGE_SIZE,
"adapter id: %d\nminor: %d\naen group: %d\n",
adapter_id, MINOR(pinstance->cdev.dev), aen_group);
}
static struct device_attribute pmcraid_adapter_id_attr = {
.attr = {
.name = "adapter_id",
.mode = S_IRUGO | S_IWUSR,
},
.show = pmcraid_show_adapter_id,
};
static struct device_attribute *pmcraid_host_attrs[] = {
&pmcraid_log_level_attr,
&pmcraid_driver_version_attr,
&pmcraid_adapter_id_attr,
NULL,
};
/* host template structure for pmcraid driver */
static struct scsi_host_template pmcraid_host_template = {
.module = THIS_MODULE,
.name = PMCRAID_DRIVER_NAME,
.queuecommand = pmcraid_queuecommand,
.eh_abort_handler = pmcraid_eh_abort_handler,
.eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
.eh_target_reset_handler = pmcraid_eh_target_reset_handler,
.eh_device_reset_handler = pmcraid_eh_device_reset_handler,
.eh_host_reset_handler = pmcraid_eh_host_reset_handler,
.slave_alloc = pmcraid_slave_alloc,
.slave_configure = pmcraid_slave_configure,
.slave_destroy = pmcraid_slave_destroy,
.change_queue_depth = pmcraid_change_queue_depth,
.change_queue_type = pmcraid_change_queue_type,
.can_queue = PMCRAID_MAX_IO_CMD,
.this_id = -1,
.sg_tablesize = PMCRAID_MAX_IOADLS,
.max_sectors = PMCRAID_IOA_MAX_SECTORS,
.cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = pmcraid_host_attrs,
.proc_name = PMCRAID_DRIVER_NAME
};
/**
* pmcraid_isr_common - Common interrupt handler routine
*
* @pinstance: pointer to adapter instance
* @intrs: active interrupts (contents of ioa_host_interrupt register)
* @hrrq_id: Host RRQ index
*
* Return Value
* none
*/
static void pmcraid_isr_common(
struct pmcraid_instance *pinstance,
u32 intrs,
int hrrq_id
)
{
u32 intrs_clear =
(intrs & INTRS_CRITICAL_OP_IN_PROGRESS) ? intrs
: INTRS_HRRQ_VALID;
iowrite32(intrs_clear,
pinstance->int_regs.ioa_host_interrupt_clr_reg);
intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
/* hrrq valid bit was set, schedule tasklet to handle the response */
if (intrs_clear == INTRS_HRRQ_VALID)
tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
}
/**
* pmcraid_isr - implements interrupt handling routine
*
* @irq: interrupt vector number
* @dev_id: pointer hrrq_vector
*
* Return Value
* IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
*/
static irqreturn_t pmcraid_isr(int irq, void *dev_id)
{
struct pmcraid_isr_param *hrrq_vector;
struct pmcraid_instance *pinstance;
unsigned long lock_flags;
u32 intrs;
/* In case of legacy interrupt mode where interrupts are shared across
* isrs, it may be possible that the current interrupt is not from IOA
*/
if (!dev_id) {
printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
return IRQ_NONE;
}
hrrq_vector = (struct pmcraid_isr_param *)dev_id;
pinstance = hrrq_vector->drv_inst;
/* Acquire the lock (currently host_lock) while processing interrupts.
* This interval is small as most of the response processing is done by
* tasklet without the lock.
*/
spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
intrs = pmcraid_read_interrupts(pinstance);
if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0)) {
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
return IRQ_NONE;
}
/* Any error interrupts including unit_check, initiate IOA reset.
* In case of unit check indicate to reset_sequence that IOA unit
* checked and prepare for a dump during reset sequence
*/
if (intrs & PMCRAID_ERROR_INTERRUPTS) {
if (intrs & INTRS_IOA_UNIT_CHECK)
pinstance->ioa_unit_check = 1;
iowrite32(intrs,
pinstance->int_regs.ioa_host_interrupt_clr_reg);
pmcraid_err("ISR: error interrupts: %x initiating reset\n",
intrs);
intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
pmcraid_initiate_reset(pinstance);
} else {
pmcraid_isr_common(pinstance, intrs, hrrq_vector->hrrq_id);
}
spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
return IRQ_HANDLED;
}
/**
* pmcraid_worker_function - worker thread function
*
* @workp: pointer to struct work queue
*
* Return Value
* None
*/
static void pmcraid_worker_function(struct work_struct *workp)
{
struct pmcraid_instance *pinstance;
struct pmcraid_resource_entry *res;
struct pmcraid_resource_entry *temp;
struct scsi_device *sdev;
unsigned long lock_flags;
unsigned long host_lock_flags;
u8 bus, target, lun;
pinstance = container_of(workp, struct pmcraid_instance, worker_q);
/* add resources only after host is added into system */
if (!atomic_read(&pinstance->expose_resources))
return;
spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
sdev = res->scsi_dev;
/* host_lock must be held before calling
* scsi_device_get
*/
spin_lock_irqsave(pinstance->host->host_lock,
host_lock_flags);
if (!scsi_device_get(sdev)) {
spin_unlock_irqrestore(
pinstance->host->host_lock,
host_lock_flags);
pmcraid_info("deleting %x from midlayer\n",
res->cfg_entry.resource_address);
list_move_tail(&res->queue,
&pinstance->free_res_q);
spin_unlock_irqrestore(
&pinstance->resource_lock,
lock_flags);
scsi_remove_device(sdev);
scsi_device_put(sdev);
spin_lock_irqsave(&pinstance->resource_lock,
lock_flags);
res->change_detected = 0;
} else {
spin_unlock_irqrestore(
pinstance->host->host_lock,
host_lock_flags);
}
}
}
list_for_each_entry(res, &pinstance->used_res_q, queue) {
if (res->change_detected == RES_CHANGE_ADD) {
if (!pmcraid_expose_resource(&res->cfg_entry))
continue;
if (RES_IS_VSET(res->cfg_entry)) {
bus = PMCRAID_VSET_BUS_ID;
target = res->cfg_entry.unique_flags1;
lun = PMCRAID_VSET_LUN_ID;
} else {
bus = PMCRAID_PHYS_BUS_ID;
target =
RES_TARGET(
res->cfg_entry.resource_address);
lun = RES_LUN(res->cfg_entry.resource_address);
}
res->change_detected = 0;
spin_unlock_irqrestore(&pinstance->resource_lock,
lock_flags);
scsi_add_device(pinstance->host, bus, target, lun);
spin_lock_irqsave(&pinstance->resource_lock,
lock_flags);
}
}
spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
}
/**
* pmcraid_tasklet_function - Tasklet function
*
* @instance: pointer to msix param structure
*
* Return Value
* None
*/
void pmcraid_tasklet_function(unsigned long instance)
{
struct pmcraid_isr_param *hrrq_vector;
struct pmcraid_instance *pinstance;
unsigned long hrrq_lock_flags;
unsigned long pending_lock_flags;
unsigned long host_lock_flags;
spinlock_t *lockp; /* hrrq buffer lock */
int id;
u32 intrs;
__le32 resp;
hrrq_vector = (struct pmcraid_isr_param *)instance;
pinstance = hrrq_vector->drv_inst;
id = hrrq_vector->hrrq_id;
lockp = &(pinstance->hrrq_lock[id]);
intrs = pmcraid_read_interrupts(pinstance);
/* If interrupts was as part of the ioa initialization, clear and mask
* it. Delete the timer and wakeup the reset engine to proceed with
* reset sequence
*/
if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
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);
if (pinstance->reset_cmd != NULL) {
del_timer(&pinstance->reset_cmd->timer);
spin_lock_irqsave(pinstance->host->host_lock,
host_lock_flags);
pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
spin_unlock_irqrestore(pinstance->host->host_lock,
host_lock_flags);
}
return;
}
/* loop through each of the commands responded by IOA. Each HRRQ buf is
* protected by its own lock. Traversals must be done within this lock
* as there may be multiple tasklets running on multiple CPUs. Note
* that the lock is held just for picking up the response handle and
* manipulating hrrq_curr/toggle_bit values.
*/
spin_lock_irqsave(lockp, hrrq_lock_flags);
resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
while ((resp & HRRQ_TOGGLE_BIT) ==
pinstance->host_toggle_bit[id]) {
int cmd_index = resp >> 2;
struct pmcraid_cmd *cmd = NULL;
if (cmd_index < PMCRAID_MAX_CMD) {
cmd = pinstance->cmd_list[cmd_index];
} else {
/* In case of invalid response handle, initiate IOA
* reset sequence.
*/
spin_unlock_irqrestore(lockp, hrrq_lock_flags);
pmcraid_err("Invalid response %d initiating reset\n",
cmd_index);
spin_lock_irqsave(pinstance->host->host_lock,
host_lock_flags);
pmcraid_initiate_reset(pinstance);
spin_unlock_irqrestore(pinstance->host->host_lock,
host_lock_flags);
spin_lock_irqsave(lockp, hrrq_lock_flags);
break;
}
if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
pinstance->hrrq_curr[id]++;
} else {
pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
pinstance->host_toggle_bit[id] ^= 1u;
}
spin_unlock_irqrestore(lockp, hrrq_lock_flags);
spin_lock_irqsave(&pinstance->pending_pool_lock,
pending_lock_flags);
list_del(&cmd->free_list);
spin_unlock_irqrestore(&pinstance->pending_pool_lock,
pending_lock_flags);
del_timer(&cmd->timer);
atomic_dec(&pinstance->outstanding_cmds);
if (cmd->cmd_done == pmcraid_ioa_reset) {
spin_lock_irqsave(pinstance->host->host_lock,
host_lock_flags);
cmd->cmd_done(cmd);
spin_unlock_irqrestore(pinstance->host->host_lock,
host_lock_flags);
} else if (cmd->cmd_done != NULL) {
cmd->cmd_done(cmd);
}
/* loop over until we are done with all responses */
spin_lock_irqsave(lockp, hrrq_lock_flags);
resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
}
spin_unlock_irqrestore(lockp, hrrq_lock_flags);
}
/**
* pmcraid_unregister_interrupt_handler - de-register interrupts handlers
* @pinstance: pointer to adapter instance structure
*
* This routine un-registers registered interrupt handler and
* also frees irqs/vectors.
*
* Retun Value
* None
*/
static
void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
{
free_irq(pinstance->pdev->irq, &(pinstance->hrrq_vector[0]));
}
/**
* pmcraid_register_interrupt_handler - registers interrupt handler
* @pinstance: pointer to per-adapter instance structure
*
* Return Value
* 0 on success, non-zero error code otherwise.
*/
static int
pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
{
struct pci_dev *pdev = pinstance->pdev;
pinstance->hrrq_vector[0].hrrq_id = 0;
pinstance->hrrq_vector[0].drv_inst = pinstance;
pinstance->hrrq_vector[0].vector = 0;
pinstance->num_hrrq = 1;
return request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
}
/**
* pmcraid_release_cmd_blocks - release buufers allocated for command blocks
* @pinstance: per adapter instance structure pointer
* @max_index: number of buffer blocks to release
*
* Return Value
* None
*/
static void
pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
{
int i;
for (i = 0; i < max_index; i++) {
kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
pinstance->cmd_list[i] = NULL;
}
kmem_cache_destroy(pinstance->cmd_cachep);
pinstance->cmd_cachep = NULL;
}
/**
* pmcraid_release_control_blocks - releases buffers alloced for control blocks
* @pinstance: pointer to per adapter instance structure
* @max_index: number of buffers (from 0 onwards) to release
*
* This function assumes that the command blocks for which control blocks are
* linked are not released.
*
* Return Value
* None
*/
static void
pmcraid_release_control_blocks(
struct pmcraid_instance *pinstance,
int max_index
)
{
int i;
if (pinstance->control_pool == NULL)
return;
for (i = 0; i < max_index; i++) {
pci_pool_free(pinstance->control_pool,
pinstance->cmd_list[i]->ioa_cb,
pinstance->cmd_list[i]->ioa_cb_bus_addr);
pinstance->cmd_list[i]->ioa_cb = NULL;
pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
}
pci_pool_destroy(pinstance->control_pool);
pinstance->control_pool = NULL;
}
/**
* pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
* @pinstance - pointer to per adapter instance structure
*
* Allocates memory for command blocks using kernel slab allocator.
*
* Return Value
* 0 in case of success; -ENOMEM in case of failure
*/
static int __devinit
pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
{
int i;
sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
pinstance->host->unique_id);
pinstance->cmd_cachep = kmem_cache_create(
pinstance->cmd_pool_name,
sizeof(struct pmcraid_cmd), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!pinstance->cmd_cachep)
return -ENOMEM;
for (i = 0; i < PMCRAID_MAX_CMD; i++) {
pinstance->cmd_list[i] =
kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
if (!pinstance->cmd_list[i]) {
pmcraid_release_cmd_blocks(pinstance, i);
return -ENOMEM;
}
}
return 0;
}
/**
* pmcraid_allocate_control_blocks - allocates memory control blocks
* @pinstance : pointer to per adapter instance structure
*
* This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
* and IOASAs. This is called after command blocks are already allocated.
*
* Return Value
* 0 in case it can allocate all control blocks, otherwise -ENOMEM
*/
static int __devinit
pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
{
int i;
sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
pinstance->host->unique_id);
pinstance->control_pool =
pci_pool_create(pinstance->ctl_pool_name,
pinstance->pdev,
sizeof(struct pmcraid_control_block),
PMCRAID_IOARCB_ALIGNMENT, 0);
if (!pinstance->control_pool)
return -ENOMEM;
for (i = 0; i < PMCRAID_MAX_CMD; i++) {
pinstance->cmd_list[i]->ioa_cb =
pci_pool_alloc(
pinstance->control_pool,
GFP_KERNEL,
&(pinstance->cmd_list[i]->ioa_cb_bus_addr));
if (!pinstance->cmd_list[i]->ioa_cb) {
pmcraid_release_control_blocks(pinstance, i);
return -ENOMEM;
}
memset(pinstance->cmd_list[i]->ioa_cb, 0,
sizeof(struct pmcraid_control_block));
}
return 0;
}
/**
* pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
* @pinstance: pointer to per adapter instance structure
* @maxindex: size of hrrq buffer pointer array
*
* Return Value
* None
*/
static void
pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
{
int i;
for (i = 0; i < maxindex; i++) {
pci_free_consistent(pinstance->pdev,
HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
pinstance->hrrq_start[i],
pinstance->hrrq_start_bus_addr[i]);
/* reset pointers and toggle bit to zeros */
pinstance->hrrq_start[i] = NULL;
pinstance->hrrq_start_bus_addr[i] = 0;
pinstance->host_toggle_bit[i] = 0;
}
}
/**
* pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
* @pinstance: pointer to per adapter instance structure
*
* Return value
* 0 hrrq buffers are allocated, -ENOMEM otherwise.
*/
static int __devinit
pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
{
int i;
int buf_count = PMCRAID_MAX_CMD / pinstance->num_hrrq;
for (i = 0; i < pinstance->num_hrrq; i++) {
int buffer_size = HRRQ_ENTRY_SIZE * buf_count;
pinstance->hrrq_start[i] =
pci_alloc_consistent(
pinstance->pdev,
buffer_size,
&(pinstance->hrrq_start_bus_addr[i]));
if (pinstance->hrrq_start[i] == 0) {
pmcraid_err("could not allocate host rrq: %d\n", i);
pmcraid_release_host_rrqs(pinstance, i);
return -ENOMEM;
}
memset(pinstance->hrrq_start[i], 0, buffer_size);
pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
pinstance->hrrq_end[i] =
pinstance->hrrq_start[i] + buf_count - 1;
pinstance->host_toggle_bit[i] = 1;
spin_lock_init(&pinstance->hrrq_lock[i]);
}
return 0;
}
/**
* pmcraid_release_hcams - release HCAM buffers
*
* @pinstance: pointer to per adapter instance structure
*
* Return value
* none
*/
static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
{
if (pinstance->ccn.msg != NULL) {
pci_free_consistent(pinstance->pdev,
PMCRAID_AEN_HDR_SIZE +
sizeof(struct pmcraid_hcam_ccn),
pinstance->ccn.msg,
pinstance->ccn.baddr);
pinstance->ccn.msg = NULL;
pinstance->ccn.hcam = NULL;
pinstance->ccn.baddr = 0;
}
if (pinstance->ldn.msg != NULL) {
pci_free_consistent(pinstance->pdev,
PMCRAID_AEN_HDR_SIZE +
sizeof(struct pmcraid_hcam_ldn),
pinstance->ldn.msg,
pinstance->ldn.baddr);
pinstance->ldn.msg = NULL;
pinstance->ldn.hcam = NULL;
pinstance->ldn.baddr = 0;
}
}
/**
* pmcraid_allocate_hcams - allocates HCAM buffers
* @pinstance : pointer to per adapter instance structure
*
* Return Value:
* 0 in case of successful allocation, non-zero otherwise
*/
static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
{
pinstance->ccn.msg = pci_alloc_consistent(
pinstance->pdev,
PMCRAID_AEN_HDR_SIZE +
sizeof(struct pmcraid_hcam_ccn),
&(pinstance->ccn.baddr));
pinstance->ldn.msg = pci_alloc_consistent(
pinstance->pdev,
PMCRAID_AEN_HDR_SIZE +
sizeof(struct pmcraid_hcam_ldn),
&(pinstance->ldn.baddr));
if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
pmcraid_release_hcams(pinstance);
} else {
pinstance->ccn.hcam =
(void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
pinstance->ldn.hcam =
(void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
atomic_set(&pinstance->ccn.ignore, 0);
atomic_set(&pinstance->ldn.ignore, 0);
}
return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
}
/**
* pmcraid_release_config_buffers - release config.table buffers
* @pinstance: pointer to per adapter instance structure
*
* Return Value
* none
*/
static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
{
if (pinstance->cfg_table != NULL &&
pinstance->cfg_table_bus_addr != 0) {
pci_free_consistent(pinstance->pdev,
sizeof(struct pmcraid_config_table),
pinstance->cfg_table,
pinstance->cfg_table_bus_addr);
pinstance->cfg_table = NULL;
pinstance->cfg_table_bus_addr = 0;
}
if (pinstance->res_entries != NULL) {
int i;
for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
list_del(&pinstance->res_entries[i].queue);
kfree(pinstance->res_entries);
pinstance->res_entries = NULL;
}
pmcraid_release_hcams(pinstance);
}
/**
* pmcraid_allocate_config_buffers - allocates DMAable memory for config table
* @pinstance : pointer to per adapter instance structure
*
* Return Value
* 0 for successful allocation, -ENOMEM for any failure
*/
static int __devinit
pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
{
int i;
pinstance->res_entries =
kzalloc(sizeof(struct pmcraid_resource_entry) *
PMCRAID_MAX_RESOURCES, GFP_KERNEL);
if (NULL == pinstance->res_entries) {
pmcraid_err("failed to allocate memory for resource table\n");
return -ENOMEM;
}
for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
list_add_tail(&pinstance->res_entries[i].queue,
&pinstance->free_res_q);
pinstance->cfg_table =
pci_alloc_consistent(pinstance->pdev,
sizeof(struct pmcraid_config_table),
&pinstance->cfg_table_bus_addr);
if (NULL == pinstance->cfg_table) {
pmcraid_err("couldn't alloc DMA memory for config table\n");
pmcraid_release_config_buffers(pinstance);
return -ENOMEM;
}
if (pmcraid_allocate_hcams(pinstance)) {
pmcraid_err("could not alloc DMA memory for HCAMS\n");
pmcraid_release_config_buffers(pinstance);
return -ENOMEM;
}
return 0;
}
/**
* pmcraid_init_tasklets - registers tasklets for response handling
*
* @pinstance: pointer adapter instance structure
*
* Return value
* none
*/
static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
{
int i;
for (i = 0; i < pinstance->num_hrrq; i++)
tasklet_init(&pinstance->isr_tasklet[i],
pmcraid_tasklet_function,
(unsigned long)&pinstance->hrrq_vector[i]);
}
/**
* pmcraid_kill_tasklets - destroys tasklets registered for response handling
*
* @pinstance: pointer to adapter instance structure
*
* Return value
* none
*/
static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
{
int i;
for (i = 0; i < pinstance->num_hrrq; i++)
tasklet_kill(&pinstance->isr_tasklet[i]);
}
/**
* pmcraid_init_buffers - allocates memory and initializes various structures
* @pinstance: pointer to per adapter instance structure
*
* This routine pre-allocates memory based on the type of block as below:
* cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
* IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
* config-table entries : DMAable memory using pci_alloc_consistent
* HostRRQs : DMAable memory, using pci_alloc_consistent
*
* Return Value
* 0 in case all of the blocks are allocated, -ENOMEM otherwise.
*/
static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
{
int i;
if (pmcraid_allocate_host_rrqs(pinstance)) {
pmcraid_err("couldn't allocate memory for %d host rrqs\n",
pinstance->num_hrrq);
return -ENOMEM;
}
if (pmcraid_allocate_config_buffers(pinstance)) {
pmcraid_err("couldn't allocate memory for config buffers\n");
pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
return -ENOMEM;
}
if (pmcraid_allocate_cmd_blocks(pinstance)) {
pmcraid_err("couldn't allocate memory for cmd blocks \n");
pmcraid_release_config_buffers(pinstance);
pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
return -ENOMEM;
}
if (pmcraid_allocate_control_blocks(pinstance)) {
pmcraid_err("couldn't allocate memory control blocks \n");
pmcraid_release_config_buffers(pinstance);
pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
return -ENOMEM;
}
/* Initialize all the command blocks and add them to free pool. No
* need to lock (free_pool_lock) as this is done in initialization
* itself
*/
for (i = 0; i < PMCRAID_MAX_CMD; i++) {
struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
pmcraid_init_cmdblk(cmdp, i);
cmdp->drv_inst = pinstance;
list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
}
return 0;
}
/**
* pmcraid_reinit_buffers - resets various buffer pointers
* @pinstance: pointer to adapter instance
* Return value
* none
*/
static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
{
int i;
int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
for (i = 0; i < pinstance->num_hrrq; i++) {
memset(pinstance->hrrq_start[i], 0, buffer_size);
pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
pinstance->hrrq_end[i] =
pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
pinstance->host_toggle_bit[i] = 1;
}
}
/**
* pmcraid_init_instance - initialize per instance data structure
* @pdev: pointer to pci device structure
* @host: pointer to Scsi_Host structure
* @mapped_pci_addr: memory mapped IOA configuration registers
*
* Return Value
* 0 on success, non-zero in case of any failure
*/
static int __devinit pmcraid_init_instance(
struct pci_dev *pdev,
struct Scsi_Host *host,
void __iomem *mapped_pci_addr
)
{
struct pmcraid_instance *pinstance =
(struct pmcraid_instance *)host->hostdata;
pinstance->host = host;
pinstance->pdev = pdev;
/* Initialize register addresses */
pinstance->mapped_dma_addr = mapped_pci_addr;
/* Initialize chip-specific details */
{
struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
pint_regs->ioa_host_interrupt_reg =
mapped_pci_addr + chip_cfg->ioa_host_intr;
pint_regs->ioa_host_interrupt_clr_reg =
mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
pint_regs->host_ioa_interrupt_reg =
mapped_pci_addr + chip_cfg->host_ioa_intr;
pint_regs->host_ioa_interrupt_clr_reg =
mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
/* Current version of firmware exposes interrupt mask set
* and mask clr registers through memory mapped bar0.
*/
pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
pint_regs->ioa_host_interrupt_mask_reg =
mapped_pci_addr + chip_cfg->ioa_host_mask;
pint_regs->ioa_host_interrupt_mask_clr_reg =
mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
pint_regs->global_interrupt_mask_reg =
mapped_pci_addr + chip_cfg->global_intr_mask;
};
pinstance->ioa_reset_attempts = 0;
init_waitqueue_head(&pinstance->reset_wait_q);
atomic_set(&pinstance->outstanding_cmds, 0);
atomic_set(&pinstance->expose_resources, 0);
INIT_LIST_HEAD(&pinstance->free_res_q);
INIT_LIST_HEAD(&pinstance->used_res_q);
INIT_LIST_HEAD(&pinstance->free_cmd_pool);
INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
spin_lock_init(&pinstance->free_pool_lock);
spin_lock_init(&pinstance->pending_pool_lock);
spin_lock_init(&pinstance->resource_lock);
mutex_init(&pinstance->aen_queue_lock);
/* Work-queue (Shared) for deferred processing error handling */
INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
/* Initialize the default log_level */
pinstance->current_log_level = pmcraid_log_level;
/* Setup variables required for reset engine */
pinstance->ioa_state = IOA_STATE_UNKNOWN;
pinstance->reset_cmd = NULL;
return 0;
}
/**
* pmcraid_release_buffers - release per-adapter buffers allocated
*
* @pinstance: pointer to adapter soft state
*
* Return Value
* none
*/
static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
{
pmcraid_release_config_buffers(pinstance);
pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
}
/**
* pmcraid_shutdown - shutdown adapter controller.
* @pdev: pci device struct
*
* Issues an adapter shutdown to the card waits for its completion
*
* Return value
* none
*/
static void pmcraid_shutdown(struct pci_dev *pdev)
{
struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
pmcraid_reset_bringdown(pinstance);
}
/**
* pmcraid_get_minor - returns unused minor number from minor number bitmap
*/
static unsigned short pmcraid_get_minor(void)
{
int minor;
minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
__set_bit(minor, pmcraid_minor);
return minor;
}
/**
* pmcraid_release_minor - releases given minor back to minor number bitmap
*/
static void pmcraid_release_minor(unsigned short minor)
{
__clear_bit(minor, pmcraid_minor);
}
/**
* pmcraid_setup_chrdev - allocates a minor number and registers a char device
*
* @pinstance: pointer to adapter instance for which to register device
*
* Return value
* 0 in case of success, otherwise non-zero
*/
static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
{
int minor;
int error;
minor = pmcraid_get_minor();
cdev_init(&pinstance->cdev, &pmcraid_fops);
pinstance->cdev.owner = THIS_MODULE;
error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
if (error)
pmcraid_release_minor(minor);
else
device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
NULL, "pmcsas%u", minor);
return error;
}
/**
* pmcraid_release_chrdev - unregisters per-adapter management interface
*
* @pinstance: pointer to adapter instance structure
*
* Return value
* none
*/
static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
{
pmcraid_release_minor(MINOR(pinstance->cdev.dev));
device_destroy(pmcraid_class,
MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
cdev_del(&pinstance->cdev);
}
/**
* pmcraid_remove - IOA hot plug remove entry point
* @pdev: pci device struct
*
* Return value
* none
*/
static void __devexit pmcraid_remove(struct pci_dev *pdev)
{
struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
/* remove the management interface (/dev file) for this device */
pmcraid_release_chrdev(pinstance);
/* remove host template from scsi midlayer */
scsi_remove_host(pinstance->host);
/* block requests from mid-layer */
scsi_block_requests(pinstance->host);
/* initiate shutdown adapter */
pmcraid_shutdown(pdev);
pmcraid_disable_interrupts(pinstance, ~0);
flush_scheduled_work();
pmcraid_kill_tasklets(pinstance);
pmcraid_unregister_interrupt_handler(pinstance);
pmcraid_release_buffers(pinstance);
iounmap(pinstance->mapped_dma_addr);
pci_release_regions(pdev);
scsi_host_put(pinstance->host);
pci_disable_device(pdev);
return;
}
#ifdef CONFIG_PM
/**
* pmcraid_suspend - driver suspend entry point for power management
* @pdev: PCI device structure
* @state: PCI power state to suspend routine
*
* Return Value - 0 always
*/
static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
{
struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
pmcraid_shutdown(pdev);
pmcraid_disable_interrupts(pinstance, ~0);
pmcraid_kill_tasklets(pinstance);
pci_set_drvdata(pinstance->pdev, pinstance);
pmcraid_unregister_interrupt_handler(pinstance);
pci_save_state(pdev);
pci_disable_device(pdev);
pci_set_power_state(pdev, pci_choose_state(pdev, state));
return 0;
}
/**
* pmcraid_resume - driver resume entry point PCI power management
* @pdev: PCI device structure
*
* Return Value - 0 in case of success. Error code in case of any failure
*/
static int pmcraid_resume(struct pci_dev *pdev)
{
struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
struct Scsi_Host *host = pinstance->host;
int rc;
int hrrqs;
pci_set_power_state(pdev, PCI_D0);
pci_enable_wake(pdev, PCI_D0, 0);
pci_restore_state(pdev);
rc = pci_enable_device(pdev);
if (rc) {
pmcraid_err("pmcraid: Enable device failed\n");
return rc;
}
pci_set_master(pdev);
if ((sizeof(dma_addr_t) == 4) ||
pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc == 0)
rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc != 0) {
dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
goto disable_device;
}
atomic_set(&pinstance->outstanding_cmds, 0);
hrrqs = pinstance->num_hrrq;
rc = pmcraid_register_interrupt_handler(pinstance);
if (rc) {
pmcraid_err("resume: couldn't register interrupt handlers\n");
rc = -ENODEV;
goto release_host;
}
pmcraid_init_tasklets(pinstance);
pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
/* Start with hard reset sequence which brings up IOA to operational
* state as well as completes the reset sequence.
*/
pinstance->ioa_hard_reset = 1;
/* Start IOA firmware initialization and bring card to Operational
* state.
*/
if (pmcraid_reset_bringup(pinstance)) {
pmcraid_err("couldn't initialize IOA \n");
rc = -ENODEV;
goto release_tasklets;
}
return 0;
release_tasklets:
pmcraid_kill_tasklets(pinstance);
pmcraid_unregister_interrupt_handler(pinstance);
release_host:
scsi_host_put(host);
disable_device:
pci_disable_device(pdev);
return rc;
}
#else
#define pmcraid_suspend NULL
#define pmcraid_resume NULL
#endif /* CONFIG_PM */
/**
* pmcraid_complete_ioa_reset - Called by either timer or tasklet during
* completion of the ioa reset
* @cmd: pointer to reset command block
*/
static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
{
struct pmcraid_instance *pinstance = cmd->drv_inst;
unsigned long flags;
spin_lock_irqsave(pinstance->host->host_lock, flags);
pmcraid_ioa_reset(cmd);
spin_unlock_irqrestore(pinstance->host->host_lock, flags);
scsi_unblock_requests(pinstance->host);
schedule_work(&pinstance->worker_q);
}
/**
* pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
*
* @cmd: pointer to pmcraid_cmd structure
*
* Return Value
* 0 for success or non-zero for failure cases
*/
static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
{
struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
pmcraid_reinit_cmdblk(cmd);
ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
ioarcb->request_type = REQ_TYPE_IOACMD;
ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
/* If this was called as part of resource table reinitialization due to
* lost CCN, it is enough to return the command block back to free pool
* as part of set_supported_devs completion function.
*/
if (cmd->drv_inst->reinit_cfg_table) {
cmd->drv_inst->reinit_cfg_table = 0;
cmd->release = 1;
cmd_done = pmcraid_reinit_cfgtable_done;
}
/* we will be done with the reset sequence after set supported devices,
* setup the done function to return the command block back to free
* pool
*/
pmcraid_send_cmd(cmd,
cmd_done,
PMCRAID_SET_SUP_DEV_TIMEOUT,
pmcraid_timeout_handler);
return;
}
/**
* pmcraid_init_res_table - Initialize the resource table
* @cmd: pointer to pmcraid command struct
*
* This function looks through the existing resource table, comparing
* it with the config table. This function will take care of old/new
* devices and schedule adding/removing them from the mid-layer
* as appropriate.
*
* Return value
* None
*/
static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
{
struct pmcraid_instance *pinstance = cmd->drv_inst;
struct pmcraid_resource_entry *res, *temp;
struct pmcraid_config_table_entry *cfgte;
unsigned long lock_flags;
int found, rc, i;
LIST_HEAD(old_res);
if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
dev_err(&pinstance->pdev->dev, "Require microcode download\n");
/* resource list is protected by pinstance->resource_lock.
* init_res_table can be called from probe (user-thread) or runtime
* reset (timer/tasklet)
*/
spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
list_move_tail(&res->queue, &old_res);
for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
cfgte = &pinstance->cfg_table->entries[i];
if (!pmcraid_expose_resource(cfgte))
continue;
found = 0;
/* If this entry was already detected and initialized */
list_for_each_entry_safe(res, temp, &old_res, queue) {
rc = memcmp(&res->cfg_entry.resource_address,
&cfgte->resource_address,
sizeof(cfgte->resource_address));
if (!rc) {
list_move_tail(&res->queue,
&pinstance->used_res_q);
found = 1;
break;
}
}
/* If this is new entry, initialize it and add it the queue */
if (!found) {
if (list_empty(&pinstance->free_res_q)) {
dev_err(&pinstance->pdev->dev,
"Too many devices attached\n");
break;
}
found = 1;
res = list_entry(pinstance->free_res_q.next,
struct pmcraid_resource_entry, queue);
res->scsi_dev = NULL;
res->change_detected = RES_CHANGE_ADD;
res->reset_progress = 0;
list_move_tail(&res->queue, &pinstance->used_res_q);
}
/* copy new configuration table entry details into driver
* maintained resource entry
*/
if (found) {
memcpy(&res->cfg_entry, cfgte,
sizeof(struct pmcraid_config_table_entry));
pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
res->cfg_entry.resource_type,
res->cfg_entry.unique_flags1,
le32_to_cpu(res->cfg_entry.resource_address));
}
}
/* Detect any deleted entries, mark them for deletion from mid-layer */
list_for_each_entry_safe(res, temp, &old_res, queue) {
if (res->scsi_dev) {
res->change_detected = RES_CHANGE_DEL;
res->cfg_entry.resource_handle =
PMCRAID_INVALID_RES_HANDLE;
list_move_tail(&res->queue, &pinstance->used_res_q);
} else {
list_move_tail(&res->queue, &pinstance->free_res_q);
}
}
/* release the resource list lock */
spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
pmcraid_set_supported_devs(cmd);
}
/**
* pmcraid_querycfg - Send a Query IOA Config to the adapter.
* @cmd: pointer pmcraid_cmd struct
*
* This function sends a Query IOA Configuration command to the adapter to
* retrieve the IOA configuration table.
*
* Return value:
* none
*/
static void pmcraid_querycfg(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;
int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
ioarcb->request_type = REQ_TYPE_IOACMD;
ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
/* firmware requires 4-byte length field, specified in B.E format */
memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
/* Since entire config table can be described by single IOADL, 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(sizeof(struct pmcraid_config_table));
ioadl = &(ioarcb->add_data.u.ioadl[0]);
ioadl->flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
pmcraid_send_cmd(cmd, pmcraid_init_res_table,
PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
}
/**
* pmcraid_probe - PCI probe entry pointer for PMC MaxRaid controller driver
* @pdev: pointer to pci device structure
* @dev_id: pointer to device ids structure
*
* Return Value
* returns 0 if the device is claimed and successfully configured.
* returns non-zero error code in case of any failure
*/
static int __devinit pmcraid_probe(
struct pci_dev *pdev,
const struct pci_device_id *dev_id
)
{
struct pmcraid_instance *pinstance;
struct Scsi_Host *host;
void __iomem *mapped_pci_addr;
int rc = PCIBIOS_SUCCESSFUL;
if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
pmcraid_err
("maximum number(%d) of supported adapters reached\n",
atomic_read(&pmcraid_adapter_count));
return -ENOMEM;
}
atomic_inc(&pmcraid_adapter_count);
rc = pci_enable_device(pdev);
if (rc) {
dev_err(&pdev->dev, "Cannot enable adapter\n");
atomic_dec(&pmcraid_adapter_count);
return rc;
}
dev_info(&pdev->dev,
"Found new IOA(%x:%x), Total IOA count: %d\n",
pdev->vendor, pdev->device,
atomic_read(&pmcraid_adapter_count));
rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
if (rc < 0) {
dev_err(&pdev->dev,
"Couldn't register memory range of registers\n");
goto out_disable_device;
}
mapped_pci_addr = pci_iomap(pdev, 0, 0);
if (!mapped_pci_addr) {
dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
rc = -ENOMEM;
goto out_release_regions;
}
pci_set_master(pdev);
/* Firmware requires the system bus address of IOARCB to be within
* 32-bit addressable range though it has 64-bit IOARRIN register.
* However, firmware supports 64-bit streaming DMA buffers, whereas
* coherent buffers are to be 32-bit. Since pci_alloc_consistent always
* returns memory within 4GB (if not, change this logic), coherent
* buffers are within firmware acceptible address ranges.
*/
if ((sizeof(dma_addr_t) == 4) ||
pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
/* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
* bit mask for pci_alloc_consistent to return addresses within 4GB
*/
if (rc == 0)
rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc != 0) {
dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
goto cleanup_nomem;
}
host = scsi_host_alloc(&pmcraid_host_template,
sizeof(struct pmcraid_instance));
if (!host) {
dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
rc = -ENOMEM;
goto cleanup_nomem;
}
host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
host->unique_id = host->host_no;
host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
/* zero out entire instance structure */
pinstance = (struct pmcraid_instance *)host->hostdata;
memset(pinstance, 0, sizeof(*pinstance));
pinstance->chip_cfg =
(struct pmcraid_chip_details *)(dev_id->driver_data);
rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
if (rc < 0) {
dev_err(&pdev->dev, "failed to initialize adapter instance\n");
goto out_scsi_host_put;
}
pci_set_drvdata(pdev, pinstance);
/* Save PCI config-space for use following the reset */
rc = pci_save_state(pinstance->pdev);
if (rc != 0) {
dev_err(&pdev->dev, "Failed to save PCI config space\n");
goto out_scsi_host_put;
}
pmcraid_disable_interrupts(pinstance, ~0);
rc = pmcraid_register_interrupt_handler(pinstance);
if (rc) {
pmcraid_err("couldn't register interrupt handler\n");
goto out_scsi_host_put;
}
pmcraid_init_tasklets(pinstance);
/* allocate verious buffers used by LLD.*/
rc = pmcraid_init_buffers(pinstance);
if (rc) {
pmcraid_err("couldn't allocate memory blocks\n");
goto out_unregister_isr;
}
/* check the reset type required */
pmcraid_reset_type(pinstance);
pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
/* Start IOA firmware initialization and bring card to Operational
* state.
*/
pmcraid_info("starting IOA initialization sequence\n");
if (pmcraid_reset_bringup(pinstance)) {
pmcraid_err("couldn't initialize IOA \n");
rc = 1;
goto out_release_bufs;
}
/* Add adapter instance into mid-layer list */
rc = scsi_add_host(pinstance->host, &pdev->dev);
if (rc != 0) {
pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
goto out_release_bufs;
}
scsi_scan_host(pinstance->host);
rc = pmcraid_setup_chrdev(pinstance);
if (rc != 0) {
pmcraid_err("couldn't create mgmt interface, error: %x\n",
rc);
goto out_remove_host;
}
/* Schedule worker thread to handle CCN and take care of adding and
* removing devices to OS
*/
atomic_set(&pinstance->expose_resources, 1);
schedule_work(&pinstance->worker_q);
return rc;
out_remove_host:
scsi_remove_host(host);
out_release_bufs:
pmcraid_release_buffers(pinstance);
out_unregister_isr:
pmcraid_kill_tasklets(pinstance);
pmcraid_unregister_interrupt_handler(pinstance);
out_scsi_host_put:
scsi_host_put(host);
cleanup_nomem:
iounmap(mapped_pci_addr);
out_release_regions:
pci_release_regions(pdev);
out_disable_device:
atomic_dec(&pmcraid_adapter_count);
pci_set_drvdata(pdev, NULL);
pci_disable_device(pdev);
return -ENODEV;
}
/*
* PCI driver structure of pcmraid driver
*/
static struct pci_driver pmcraid_driver = {
.name = PMCRAID_DRIVER_NAME,
.id_table = pmcraid_pci_table,
.probe = pmcraid_probe,
.remove = pmcraid_remove,
.suspend = pmcraid_suspend,
.resume = pmcraid_resume,
.shutdown = pmcraid_shutdown
};
/**
* pmcraid_init - module load entry point
*/
static int __init pmcraid_init(void)
{
dev_t dev;
int error;
pmcraid_info("%s Device Driver version: %s %s\n",
PMCRAID_DRIVER_NAME,
PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE);
error = alloc_chrdev_region(&dev, 0,
PMCRAID_MAX_ADAPTERS,
PMCRAID_DEVFILE);
if (error) {
pmcraid_err("failed to get a major number for adapters\n");
goto out_init;
}
pmcraid_major = MAJOR(dev);
pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
if (IS_ERR(pmcraid_class)) {
error = PTR_ERR(pmcraid_class);
pmcraid_err("failed to register with with sysfs, error = %x\n",
error);
goto out_unreg_chrdev;
}
error = pmcraid_netlink_init();
if (error)
goto out_unreg_chrdev;
error = pci_register_driver(&pmcraid_driver);
if (error == 0)
goto out_init;
pmcraid_err("failed to register pmcraid driver, error = %x\n",
error);
class_destroy(pmcraid_class);
pmcraid_netlink_release();
out_unreg_chrdev:
unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
out_init:
return error;
}
/**
* pmcraid_exit - module unload entry point
*/
static void __exit pmcraid_exit(void)
{
pmcraid_netlink_release();
class_destroy(pmcraid_class);
unregister_chrdev_region(MKDEV(pmcraid_major, 0),
PMCRAID_MAX_ADAPTERS);
pci_unregister_driver(&pmcraid_driver);
}
module_init(pmcraid_init);
module_exit(pmcraid_exit);
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