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gfiber / kernel / windcharger / d146c9bdba1372375291cc5fd333a886f16eda45 / . / drivers / scsi / qla4xxx / ql4_os.c
blob: 40e3cafb3a9c54e44e813f738a01eec9c060498a [file] [log] [blame]
/*
* QLogic iSCSI HBA Driver
* Copyright (c) 2003-2006 QLogic Corporation
*
* See LICENSE.qla4xxx for copyright and licensing details.
*/
#include <linux/moduleparam.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include "ql4_def.h"
#include "ql4_version.h"
#include "ql4_glbl.h"
#include "ql4_dbg.h"
#include "ql4_inline.h"
/*
* Driver version
*/
static char qla4xxx_version_str[40];
/*
* SRB allocation cache
*/
static struct kmem_cache *srb_cachep;
/*
* Module parameter information and variables
*/
int ql4xdiscoverywait = 60;
module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
int ql4xdontresethba = 0;
module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
MODULE_PARM_DESC(ql4xdontresethba,
"Dont reset the HBA when the driver gets 0x8002 AEN "
" default it will reset hba :0"
" set to 1 to avoid resetting HBA");
int ql4xextended_error_logging = 0; /* 0 = off, 1 = log errors */
module_param(ql4xextended_error_logging, int, S_IRUGO | S_IRUSR);
MODULE_PARM_DESC(ql4xextended_error_logging,
"Option to enable extended error logging, "
"Default is 0 - no logging, 1 - debug logging");
int ql4_mod_unload = 0;
#define QL4_DEF_QDEPTH 32
/*
* SCSI host template entry points
*/
static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);
/*
* iSCSI template entry points
*/
static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
enum iscsi_tgt_dscvr type, uint32_t enable,
struct sockaddr *dst_addr);
static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
enum iscsi_param param, char *buf);
static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
enum iscsi_param param, char *buf);
static int qla4xxx_host_get_param(struct Scsi_Host *shost,
enum iscsi_host_param param, char *buf);
static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc);
/*
* SCSI host template entry points
*/
static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
void (*done) (struct scsi_cmnd *));
static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd);
static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
static int qla4xxx_slave_alloc(struct scsi_device *device);
static int qla4xxx_slave_configure(struct scsi_device *device);
static void qla4xxx_slave_destroy(struct scsi_device *sdev);
static void qla4xxx_scan_start(struct Scsi_Host *shost);
static struct scsi_host_template qla4xxx_driver_template = {
.module = THIS_MODULE,
.name = DRIVER_NAME,
.proc_name = DRIVER_NAME,
.queuecommand = qla4xxx_queuecommand,
.eh_device_reset_handler = qla4xxx_eh_device_reset,
.eh_target_reset_handler = qla4xxx_eh_target_reset,
.eh_host_reset_handler = qla4xxx_eh_host_reset,
.eh_timed_out = qla4xxx_eh_cmd_timed_out,
.slave_configure = qla4xxx_slave_configure,
.slave_alloc = qla4xxx_slave_alloc,
.slave_destroy = qla4xxx_slave_destroy,
.scan_finished = iscsi_scan_finished,
.scan_start = qla4xxx_scan_start,
.this_id = -1,
.cmd_per_lun = 3,
.use_clustering = ENABLE_CLUSTERING,
.sg_tablesize = SG_ALL,
.max_sectors = 0xFFFF,
};
static struct iscsi_transport qla4xxx_iscsi_transport = {
.owner = THIS_MODULE,
.name = DRIVER_NAME,
.caps = CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
CAP_DATA_PATH_OFFLOAD,
.param_mask = ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
ISCSI_TARGET_NAME | ISCSI_TPGT,
.host_param_mask = ISCSI_HOST_HWADDRESS |
ISCSI_HOST_IPADDRESS |
ISCSI_HOST_INITIATOR_NAME,
.tgt_dscvr = qla4xxx_tgt_dscvr,
.get_conn_param = qla4xxx_conn_get_param,
.get_session_param = qla4xxx_sess_get_param,
.get_host_param = qla4xxx_host_get_param,
.session_recovery_timedout = qla4xxx_recovery_timedout,
};
static struct scsi_transport_template *qla4xxx_scsi_transport;
static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc)
{
struct iscsi_cls_session *session;
struct ddb_entry *ddb_entry;
session = starget_to_session(scsi_target(sc->device));
ddb_entry = session->dd_data;
/* if we are not logged in then the LLD is going to clean up the cmd */
if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
return BLK_EH_RESET_TIMER;
else
return BLK_EH_NOT_HANDLED;
}
static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
{
struct ddb_entry *ddb_entry = session->dd_data;
struct scsi_qla_host *ha = ddb_entry->ha;
if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count "
"of (%d) secs exhausted, marking device DEAD.\n",
ha->host_no, __func__, ddb_entry->fw_ddb_index,
ha->port_down_retry_count));
DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc "
"flags = 0x%lx\n",
ha->host_no, __func__, ha->dpc_flags));
queue_work(ha->dpc_thread, &ha->dpc_work);
}
}
static int qla4xxx_host_get_param(struct Scsi_Host *shost,
enum iscsi_host_param param, char *buf)
{
struct scsi_qla_host *ha = to_qla_host(shost);
int len;
switch (param) {
case ISCSI_HOST_PARAM_HWADDRESS:
len = sysfs_format_mac(buf, ha->my_mac, MAC_ADDR_LEN);
break;
case ISCSI_HOST_PARAM_IPADDRESS:
len = sprintf(buf, "%d.%d.%d.%d\n", ha->ip_address[0],
ha->ip_address[1], ha->ip_address[2],
ha->ip_address[3]);
break;
case ISCSI_HOST_PARAM_INITIATOR_NAME:
len = sprintf(buf, "%s\n", ha->name_string);
break;
default:
return -ENOSYS;
}
return len;
}
static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
enum iscsi_param param, char *buf)
{
struct ddb_entry *ddb_entry = sess->dd_data;
int len;
switch (param) {
case ISCSI_PARAM_TARGET_NAME:
len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
ddb_entry->iscsi_name);
break;
case ISCSI_PARAM_TPGT:
len = sprintf(buf, "%u\n", ddb_entry->tpgt);
break;
default:
return -ENOSYS;
}
return len;
}
static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
enum iscsi_param param, char *buf)
{
struct iscsi_cls_session *session;
struct ddb_entry *ddb_entry;
int len;
session = iscsi_dev_to_session(conn->dev.parent);
ddb_entry = session->dd_data;
switch (param) {
case ISCSI_PARAM_CONN_PORT:
len = sprintf(buf, "%hu\n", ddb_entry->port);
break;
case ISCSI_PARAM_CONN_ADDRESS:
/* TODO: what are the ipv6 bits */
len = sprintf(buf, "%pI4\n", &ddb_entry->ip_addr);
break;
default:
return -ENOSYS;
}
return len;
}
static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
enum iscsi_tgt_dscvr type, uint32_t enable,
struct sockaddr *dst_addr)
{
struct scsi_qla_host *ha;
struct sockaddr_in *addr;
struct sockaddr_in6 *addr6;
int ret = 0;
ha = (struct scsi_qla_host *) shost->hostdata;
switch (type) {
case ISCSI_TGT_DSCVR_SEND_TARGETS:
if (dst_addr->sa_family == AF_INET) {
addr = (struct sockaddr_in *)dst_addr;
if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
addr->sin_port) != QLA_SUCCESS)
ret = -EIO;
} else if (dst_addr->sa_family == AF_INET6) {
/*
* TODO: fix qla4xxx_send_tgts
*/
addr6 = (struct sockaddr_in6 *)dst_addr;
if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
addr6->sin6_port) != QLA_SUCCESS)
ret = -EIO;
} else
ret = -ENOSYS;
break;
default:
ret = -ENOSYS;
}
return ret;
}
void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
{
if (!ddb_entry->sess)
return;
if (ddb_entry->conn) {
atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
iscsi_remove_session(ddb_entry->sess);
}
iscsi_free_session(ddb_entry->sess);
}
int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
{
int err;
ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
if (err) {
DEBUG2(printk(KERN_ERR "Could not add session.\n"));
return err;
}
ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0, 0);
if (!ddb_entry->conn) {
iscsi_remove_session(ddb_entry->sess);
DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
return -ENOMEM;
}
/* finally ready to go */
iscsi_unblock_session(ddb_entry->sess);
return 0;
}
struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
{
struct ddb_entry *ddb_entry;
struct iscsi_cls_session *sess;
sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport,
sizeof(struct ddb_entry));
if (!sess)
return NULL;
ddb_entry = sess->dd_data;
memset(ddb_entry, 0, sizeof(*ddb_entry));
ddb_entry->ha = ha;
ddb_entry->sess = sess;
return ddb_entry;
}
static void qla4xxx_scan_start(struct Scsi_Host *shost)
{
struct scsi_qla_host *ha = shost_priv(shost);
struct ddb_entry *ddb_entry, *ddbtemp;
/* finish setup of sessions that were already setup in firmware */
list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
qla4xxx_add_sess(ddb_entry);
}
}
/*
* Timer routines
*/
static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
unsigned long interval)
{
DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
__func__, ha->host->host_no));
init_timer(&ha->timer);
ha->timer.expires = jiffies + interval * HZ;
ha->timer.data = (unsigned long)ha;
ha->timer.function = (void (*)(unsigned long))func;
add_timer(&ha->timer);
ha->timer_active = 1;
}
static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
{
del_timer_sync(&ha->timer);
ha->timer_active = 0;
}
/***
* qla4xxx_mark_device_missing - mark a device as missing.
* @ha: Pointer to host adapter structure.
* @ddb_entry: Pointer to device database entry
*
* This routine marks a device missing and resets the relogin retry count.
**/
void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
struct ddb_entry *ddb_entry)
{
atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
ha->host_no, ddb_entry->bus, ddb_entry->target,
ddb_entry->fw_ddb_index));
iscsi_block_session(ddb_entry->sess);
iscsi_conn_error_event(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
}
static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
struct ddb_entry *ddb_entry,
struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct srb *srb;
srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
if (!srb)
return srb;
atomic_set(&srb->ref_count, 1);
srb->ha = ha;
srb->ddb = ddb_entry;
srb->cmd = cmd;
srb->flags = 0;
cmd->SCp.ptr = (void *)srb;
cmd->scsi_done = done;
return srb;
}
static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
{
struct scsi_cmnd *cmd = srb->cmd;
if (srb->flags & SRB_DMA_VALID) {
scsi_dma_unmap(cmd);
srb->flags &= ~SRB_DMA_VALID;
}
cmd->SCp.ptr = NULL;
}
void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
{
struct scsi_cmnd *cmd = srb->cmd;
qla4xxx_srb_free_dma(ha, srb);
mempool_free(srb, ha->srb_mempool);
cmd->scsi_done(cmd);
}
/**
* qla4xxx_queuecommand - scsi layer issues scsi command to driver.
* @cmd: Pointer to Linux's SCSI command structure
* @done_fn: Function that the driver calls to notify the SCSI mid-layer
* that the command has been processed.
*
* Remarks:
* This routine is invoked by Linux to send a SCSI command to the driver.
* The mid-level driver tries to ensure that queuecommand never gets
* invoked concurrently with itself or the interrupt handler (although
* the interrupt handler may call this routine as part of request-
* completion handling). Unfortunely, it sometimes calls the scheduler
* in interrupt context which is a big NO! NO!.
**/
static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
struct ddb_entry *ddb_entry = cmd->device->hostdata;
struct iscsi_cls_session *sess = ddb_entry->sess;
struct srb *srb;
int rval;
if (!sess) {
cmd->result = DID_IMM_RETRY << 16;
goto qc_fail_command;
}
rval = iscsi_session_chkready(sess);
if (rval) {
cmd->result = rval;
goto qc_fail_command;
}
if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
cmd->result = DID_NO_CONNECT << 16;
goto qc_fail_command;
}
return SCSI_MLQUEUE_TARGET_BUSY;
}
if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
goto qc_host_busy;
spin_unlock_irq(ha->host->host_lock);
srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
if (!srb)
goto qc_host_busy_lock;
rval = qla4xxx_send_command_to_isp(ha, srb);
if (rval != QLA_SUCCESS)
goto qc_host_busy_free_sp;
spin_lock_irq(ha->host->host_lock);
return 0;
qc_host_busy_free_sp:
qla4xxx_srb_free_dma(ha, srb);
mempool_free(srb, ha->srb_mempool);
qc_host_busy_lock:
spin_lock_irq(ha->host->host_lock);
qc_host_busy:
return SCSI_MLQUEUE_HOST_BUSY;
qc_fail_command:
done(cmd);
return 0;
}
/**
* qla4xxx_mem_free - frees memory allocated to adapter
* @ha: Pointer to host adapter structure.
*
* Frees memory previously allocated by qla4xxx_mem_alloc
**/
static void qla4xxx_mem_free(struct scsi_qla_host *ha)
{
if (ha->queues)
dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
ha->queues_dma);
ha->queues_len = 0;
ha->queues = NULL;
ha->queues_dma = 0;
ha->request_ring = NULL;
ha->request_dma = 0;
ha->response_ring = NULL;
ha->response_dma = 0;
ha->shadow_regs = NULL;
ha->shadow_regs_dma = 0;
/* Free srb pool. */
if (ha->srb_mempool)
mempool_destroy(ha->srb_mempool);
ha->srb_mempool = NULL;
/* release io space registers */
if (ha->reg)
iounmap(ha->reg);
pci_release_regions(ha->pdev);
}
/**
* qla4xxx_mem_alloc - allocates memory for use by adapter.
* @ha: Pointer to host adapter structure
*
* Allocates DMA memory for request and response queues. Also allocates memory
* for srbs.
**/
static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
{
unsigned long align;
/* Allocate contiguous block of DMA memory for queues. */
ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
(RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
sizeof(struct shadow_regs) +
MEM_ALIGN_VALUE +
(PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
&ha->queues_dma, GFP_KERNEL);
if (ha->queues == NULL) {
dev_warn(&ha->pdev->dev,
"Memory Allocation failed - queues.\n");
goto mem_alloc_error_exit;
}
memset(ha->queues, 0, ha->queues_len);
/*
* As per RISC alignment requirements -- the bus-address must be a
* multiple of the request-ring size (in bytes).
*/
align = 0;
if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
(MEM_ALIGN_VALUE - 1));
/* Update request and response queue pointers. */
ha->request_dma = ha->queues_dma + align;
ha->request_ring = (struct queue_entry *) (ha->queues + align);
ha->response_dma = ha->queues_dma + align +
(REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
ha->response_ring = (struct queue_entry *) (ha->queues + align +
(REQUEST_QUEUE_DEPTH *
QUEUE_SIZE));
ha->shadow_regs_dma = ha->queues_dma + align +
(REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
(RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
(REQUEST_QUEUE_DEPTH *
QUEUE_SIZE) +
(RESPONSE_QUEUE_DEPTH *
QUEUE_SIZE));
/* Allocate memory for srb pool. */
ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
mempool_free_slab, srb_cachep);
if (ha->srb_mempool == NULL) {
dev_warn(&ha->pdev->dev,
"Memory Allocation failed - SRB Pool.\n");
goto mem_alloc_error_exit;
}
return QLA_SUCCESS;
mem_alloc_error_exit:
qla4xxx_mem_free(ha);
return QLA_ERROR;
}
/**
* qla4xxx_timer - checks every second for work to do.
* @ha: Pointer to host adapter structure.
**/
static void qla4xxx_timer(struct scsi_qla_host *ha)
{
struct ddb_entry *ddb_entry, *dtemp;
int start_dpc = 0;
/* Search for relogin's to time-out and port down retry. */
list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
/* Count down time between sending relogins */
if (adapter_up(ha) &&
!test_bit(DF_RELOGIN, &ddb_entry->flags) &&
atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
if (atomic_read(&ddb_entry->retry_relogin_timer) !=
INVALID_ENTRY) {
if (atomic_read(&ddb_entry->retry_relogin_timer)
== 0) {
atomic_set(&ddb_entry->
retry_relogin_timer,
INVALID_ENTRY);
set_bit(DPC_RELOGIN_DEVICE,
&ha->dpc_flags);
set_bit(DF_RELOGIN, &ddb_entry->flags);
DEBUG2(printk("scsi%ld: %s: index [%d]"
" login device\n",
ha->host_no, __func__,
ddb_entry->fw_ddb_index));
} else
atomic_dec(&ddb_entry->
retry_relogin_timer);
}
}
/* Wait for relogin to timeout */
if (atomic_read(&ddb_entry->relogin_timer) &&
(atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
/*
* If the relogin times out and the device is
* still NOT ONLINE then try and relogin again.
*/
if (atomic_read(&ddb_entry->state) !=
DDB_STATE_ONLINE &&
ddb_entry->fw_ddb_device_state ==
DDB_DS_SESSION_FAILED) {
/* Reset retry relogin timer */
atomic_inc(&ddb_entry->relogin_retry_count);
DEBUG2(printk("scsi%ld: index[%d] relogin"
" timed out-retrying"
" relogin (%d)\n",
ha->host_no,
ddb_entry->fw_ddb_index,
atomic_read(&ddb_entry->
relogin_retry_count))
);
start_dpc++;
DEBUG(printk("scsi%ld:%d:%d: index [%d] "
"initate relogin after"
" %d seconds\n",
ha->host_no, ddb_entry->bus,
ddb_entry->target,
ddb_entry->fw_ddb_index,
ddb_entry->default_time2wait + 4)
);
atomic_set(&ddb_entry->retry_relogin_timer,
ddb_entry->default_time2wait + 4);
}
}
}
/* Check for heartbeat interval. */
if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
ha->heartbeat_interval != 0) {
ha->seconds_since_last_heartbeat++;
if (ha->seconds_since_last_heartbeat >
ha->heartbeat_interval + 2)
set_bit(DPC_RESET_HA, &ha->dpc_flags);
}
/* Wakeup the dpc routine for this adapter, if needed. */
if ((start_dpc ||
test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
test_bit(DPC_AEN, &ha->dpc_flags)) &&
ha->dpc_thread) {
DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
" - dpc flags = 0x%lx\n",
ha->host_no, __func__, ha->dpc_flags));
queue_work(ha->dpc_thread, &ha->dpc_work);
}
/* Reschedule timer thread to call us back in one second */
mod_timer(&ha->timer, jiffies + HZ);
DEBUG2(ha->seconds_since_last_intr++);
}
/**
* qla4xxx_cmd_wait - waits for all outstanding commands to complete
* @ha: Pointer to host adapter structure.
*
* This routine stalls the driver until all outstanding commands are returned.
* Caller must release the Hardware Lock prior to calling this routine.
**/
static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
{
uint32_t index = 0;
int stat = QLA_SUCCESS;
unsigned long flags;
struct scsi_cmnd *cmd;
int wait_cnt = WAIT_CMD_TOV; /*
* Initialized for 30 seconds as we
* expect all commands to retuned
* ASAP.
*/
while (wait_cnt) {
spin_lock_irqsave(&ha->hardware_lock, flags);
/* Find a command that hasn't completed. */
for (index = 0; index < ha->host->can_queue; index++) {
cmd = scsi_host_find_tag(ha->host, index);
if (cmd != NULL)
break;
}
spin_unlock_irqrestore(&ha->hardware_lock, flags);
/* If No Commands are pending, wait is complete */
if (index == ha->host->can_queue) {
break;
}
/* If we timed out on waiting for commands to come back
* return ERROR.
*/
wait_cnt--;
if (wait_cnt == 0)
stat = QLA_ERROR;
else {
msleep(1000);
}
} /* End of While (wait_cnt) */
return stat;
}
void qla4xxx_hw_reset(struct scsi_qla_host *ha)
{
uint32_t ctrl_status;
unsigned long flags = 0;
DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));
spin_lock_irqsave(&ha->hardware_lock, flags);
/*
* If the SCSI Reset Interrupt bit is set, clear it.
* Otherwise, the Soft Reset won't work.
*/
ctrl_status = readw(&ha->reg->ctrl_status);
if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
/* Issue Soft Reset */
writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
readl(&ha->reg->ctrl_status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
}
/**
* qla4xxx_soft_reset - performs soft reset.
* @ha: Pointer to host adapter structure.
**/
int qla4xxx_soft_reset(struct scsi_qla_host *ha)
{
uint32_t max_wait_time;
unsigned long flags = 0;
int status = QLA_ERROR;
uint32_t ctrl_status;
qla4xxx_hw_reset(ha);
/* Wait until the Network Reset Intr bit is cleared */
max_wait_time = RESET_INTR_TOV;
do {
spin_lock_irqsave(&ha->hardware_lock, flags);
ctrl_status = readw(&ha->reg->ctrl_status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
break;
msleep(1000);
} while ((--max_wait_time));
if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
DEBUG2(printk(KERN_WARNING
"scsi%ld: Network Reset Intr not cleared by "
"Network function, clearing it now!\n",
ha->host_no));
spin_lock_irqsave(&ha->hardware_lock, flags);
writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
readl(&ha->reg->ctrl_status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
}
/* Wait until the firmware tells us the Soft Reset is done */
max_wait_time = SOFT_RESET_TOV;
do {
spin_lock_irqsave(&ha->hardware_lock, flags);
ctrl_status = readw(&ha->reg->ctrl_status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
if ((ctrl_status & CSR_SOFT_RESET) == 0) {
status = QLA_SUCCESS;
break;
}
msleep(1000);
} while ((--max_wait_time));
/*
* Also, make sure that the SCSI Reset Interrupt bit has been cleared
* after the soft reset has taken place.
*/
spin_lock_irqsave(&ha->hardware_lock, flags);
ctrl_status = readw(&ha->reg->ctrl_status);
if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
readl(&ha->reg->ctrl_status);
}
spin_unlock_irqrestore(&ha->hardware_lock, flags);
/* If soft reset fails then most probably the bios on other
* function is also enabled.
* Since the initialization is sequential the other fn
* wont be able to acknowledge the soft reset.
* Issue a force soft reset to workaround this scenario.
*/
if (max_wait_time == 0) {
/* Issue Force Soft Reset */
spin_lock_irqsave(&ha->hardware_lock, flags);
writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
readl(&ha->reg->ctrl_status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
/* Wait until the firmware tells us the Soft Reset is done */
max_wait_time = SOFT_RESET_TOV;
do {
spin_lock_irqsave(&ha->hardware_lock, flags);
ctrl_status = readw(&ha->reg->ctrl_status);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
status = QLA_SUCCESS;
break;
}
msleep(1000);
} while ((--max_wait_time));
}
return status;
}
/**
* qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
* @ha: Pointer to host adapter structure.
*
* This routine is called just prior to a HARD RESET to return all
* outstanding commands back to the Operating System.
* Caller should make sure that the following locks are released
* before this calling routine: Hardware lock, and io_request_lock.
**/
static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
{
struct srb *srb;
int i;
unsigned long flags;
spin_lock_irqsave(&ha->hardware_lock, flags);
for (i = 0; i < ha->host->can_queue; i++) {
srb = qla4xxx_del_from_active_array(ha, i);
if (srb != NULL) {
srb->cmd->result = DID_RESET << 16;
qla4xxx_srb_compl(ha, srb);
}
}
spin_unlock_irqrestore(&ha->hardware_lock, flags);
}
/**
* qla4xxx_recover_adapter - recovers adapter after a fatal error
* @ha: Pointer to host adapter structure.
* @renew_ddb_list: Indicates what to do with the adapter's ddb list
*
* renew_ddb_list value can be 0=preserve ddb list, 1=destroy and rebuild
* ddb list.
**/
static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
uint8_t renew_ddb_list)
{
int status;
/* Stall incoming I/O until we are done */
clear_bit(AF_ONLINE, &ha->flags);
DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
__func__));
/* Wait for outstanding commands to complete.
* Stalls the driver for max 30 secs
*/
status = qla4xxx_cmd_wait(ha);
qla4xxx_disable_intrs(ha);
/* Flush any pending ddb changed AENs */
qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
qla4xxx_flush_active_srbs(ha);
/* Reset the firmware. If successful, function
* returns with ISP interrupts enabled.
*/
DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
ha->host_no, __func__));
if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
status = qla4xxx_soft_reset(ha);
else
status = QLA_ERROR;
/* Flush any pending ddb changed AENs */
qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
/* Re-initialize firmware. If successful, function returns
* with ISP interrupts enabled */
if (status == QLA_SUCCESS) {
DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
ha->host_no, __func__));
/* If successful, AF_ONLINE flag set in
* qla4xxx_initialize_adapter */
status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
}
/* Failed adapter initialization?
* Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
(test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
/* Adapter initialization failed, see if we can retry
* resetting the ha */
if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
DEBUG2(printk("scsi%ld: recover adapter - retrying "
"(%d) more times\n", ha->host_no,
ha->retry_reset_ha_cnt));
set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
status = QLA_ERROR;
} else {
if (ha->retry_reset_ha_cnt > 0) {
/* Schedule another Reset HA--DPC will retry */
ha->retry_reset_ha_cnt--;
DEBUG2(printk("scsi%ld: recover adapter - "
"retry remaining %d\n",
ha->host_no,
ha->retry_reset_ha_cnt));
status = QLA_ERROR;
}
if (ha->retry_reset_ha_cnt == 0) {
/* Recover adapter retries have been exhausted.
* Adapter DEAD */
DEBUG2(printk("scsi%ld: recover adapter "
"failed - board disabled\n",
ha->host_no));
qla4xxx_flush_active_srbs(ha);
clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
clear_bit(DPC_RESET_HA, &ha->dpc_flags);
clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
&ha->dpc_flags);
status = QLA_ERROR;
}
}
} else {
clear_bit(DPC_RESET_HA, &ha->dpc_flags);
clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
}
ha->adapter_error_count++;
if (status == QLA_SUCCESS)
qla4xxx_enable_intrs(ha);
DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
return status;
}
/**
* qla4xxx_do_dpc - dpc routine
* @data: in our case pointer to adapter structure
*
* This routine is a task that is schedule by the interrupt handler
* to perform the background processing for interrupts. We put it
* on a task queue that is consumed whenever the scheduler runs; that's
* so you can do anything (i.e. put the process to sleep etc). In fact,
* the mid-level tries to sleep when it reaches the driver threshold
* "host->can_queue". This can cause a panic if we were in our interrupt code.
**/
static void qla4xxx_do_dpc(struct work_struct *work)
{
struct scsi_qla_host *ha =
container_of(work, struct scsi_qla_host, dpc_work);
struct ddb_entry *ddb_entry, *dtemp;
int status = QLA_ERROR;
DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
"flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
ha->host_no, __func__, ha->flags, ha->dpc_flags,
readw(&ha->reg->ctrl_status)));
/* Initialization not yet finished. Don't do anything yet. */
if (!test_bit(AF_INIT_DONE, &ha->flags))
return;
if (adapter_up(ha) ||
test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
test_bit(DPC_RESET_HA, &ha->dpc_flags))
qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
uint8_t wait_time = RESET_INTR_TOV;
while ((readw(&ha->reg->ctrl_status) &
(CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
if (--wait_time == 0)
break;
msleep(1000);
}
if (wait_time == 0)
DEBUG2(printk("scsi%ld: %s: SR|FSR "
"bit not cleared-- resetting\n",
ha->host_no, __func__));
qla4xxx_flush_active_srbs(ha);
if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
status = qla4xxx_initialize_adapter(ha,
PRESERVE_DDB_LIST);
}
clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
if (status == QLA_SUCCESS)
qla4xxx_enable_intrs(ha);
}
}
/* ---- process AEN? --- */
if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
/* ---- Get DHCP IP Address? --- */
if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
qla4xxx_get_dhcp_ip_address(ha);
/* ---- relogin device? --- */
if (adapter_up(ha) &&
test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
list_for_each_entry_safe(ddb_entry, dtemp,
&ha->ddb_list, list) {
if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
qla4xxx_relogin_device(ha, ddb_entry);
/*
* If mbx cmd times out there is no point
* in continuing further.
* With large no of targets this can hang
* the system.
*/
if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
printk(KERN_WARNING "scsi%ld: %s: "
"need to reset hba\n",
ha->host_no, __func__);
break;
}
}
}
}
/**
* qla4xxx_free_adapter - release the adapter
* @ha: pointer to adapter structure
**/
static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
{
if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
/* Turn-off interrupts on the card. */
qla4xxx_disable_intrs(ha);
}
/* Kill the kernel thread for this host */
if (ha->dpc_thread)
destroy_workqueue(ha->dpc_thread);
/* Issue Soft Reset to put firmware in unknown state */
if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
qla4xxx_hw_reset(ha);
/* Remove timer thread, if present */
if (ha->timer_active)
qla4xxx_stop_timer(ha);
/* Detach interrupts */
if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
free_irq(ha->pdev->irq, ha);
/* free extra memory */
qla4xxx_mem_free(ha);
pci_disable_device(ha->pdev);
}
/***
* qla4xxx_iospace_config - maps registers
* @ha: pointer to adapter structure
*
* This routines maps HBA's registers from the pci address space
* into the kernel virtual address space for memory mapped i/o.
**/
static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
{
unsigned long pio, pio_len, pio_flags;
unsigned long mmio, mmio_len, mmio_flags;
pio = pci_resource_start(ha->pdev, 0);
pio_len = pci_resource_len(ha->pdev, 0);
pio_flags = pci_resource_flags(ha->pdev, 0);
if (pio_flags & IORESOURCE_IO) {
if (pio_len < MIN_IOBASE_LEN) {
dev_warn(&ha->pdev->dev,
"Invalid PCI I/O region size\n");
pio = 0;
}
} else {
dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
pio = 0;
}
/* Use MMIO operations for all accesses. */
mmio = pci_resource_start(ha->pdev, 1);
mmio_len = pci_resource_len(ha->pdev, 1);
mmio_flags = pci_resource_flags(ha->pdev, 1);
if (!(mmio_flags & IORESOURCE_MEM)) {
dev_err(&ha->pdev->dev,
"region #0 not an MMIO resource, aborting\n");
goto iospace_error_exit;
}
if (mmio_len < MIN_IOBASE_LEN) {
dev_err(&ha->pdev->dev,
"Invalid PCI mem region size, aborting\n");
goto iospace_error_exit;
}
if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
dev_warn(&ha->pdev->dev,
"Failed to reserve PIO/MMIO regions\n");
goto iospace_error_exit;
}
ha->pio_address = pio;
ha->pio_length = pio_len;
ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
if (!ha->reg) {
dev_err(&ha->pdev->dev,
"cannot remap MMIO, aborting\n");
goto iospace_error_exit;
}
return 0;
iospace_error_exit:
return -ENOMEM;
}
/**
* qla4xxx_probe_adapter - callback function to probe HBA
* @pdev: pointer to pci_dev structure
* @pci_device_id: pointer to pci_device entry
*
* This routine will probe for Qlogic 4xxx iSCSI host adapters.
* It returns zero if successful. It also initializes all data necessary for
* the driver.
**/
static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int ret = -ENODEV, status;
struct Scsi_Host *host;
struct scsi_qla_host *ha;
uint8_t init_retry_count = 0;
char buf[34];
if (pci_enable_device(pdev))
return -1;
host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
if (host == NULL) {
printk(KERN_WARNING
"qla4xxx: Couldn't allocate host from scsi layer!\n");
goto probe_disable_device;
}
/* Clear our data area */
ha = (struct scsi_qla_host *) host->hostdata;
memset(ha, 0, sizeof(*ha));
/* Save the information from PCI BIOS. */
ha->pdev = pdev;
ha->host = host;
ha->host_no = host->host_no;
/* Configure PCI I/O space. */
ret = qla4xxx_iospace_config(ha);
if (ret)
goto probe_failed;
dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
pdev->device, pdev->irq, ha->reg);
qla4xxx_config_dma_addressing(ha);
/* Initialize lists and spinlocks. */
INIT_LIST_HEAD(&ha->ddb_list);
INIT_LIST_HEAD(&ha->free_srb_q);
mutex_init(&ha->mbox_sem);
spin_lock_init(&ha->hardware_lock);
/* Allocate dma buffers */
if (qla4xxx_mem_alloc(ha)) {
dev_warn(&ha->pdev->dev,
"[ERROR] Failed to allocate memory for adapter\n");
ret = -ENOMEM;
goto probe_failed;
}
/*
* Initialize the Host adapter request/response queues and
* firmware
* NOTE: interrupts enabled upon successful completion
*/
status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
DEBUG2(printk("scsi: %s: retrying adapter initialization "
"(%d)\n", __func__, init_retry_count));
qla4xxx_soft_reset(ha);
status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
}
if (status == QLA_ERROR) {
dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
ret = -ENODEV;
goto probe_failed;
}
host->cmd_per_lun = 3;
host->max_channel = 0;
host->max_lun = MAX_LUNS - 1;
host->max_id = MAX_TARGETS;
host->max_cmd_len = IOCB_MAX_CDB_LEN;
host->can_queue = MAX_SRBS ;
host->transportt = qla4xxx_scsi_transport;
ret = scsi_init_shared_tag_map(host, MAX_SRBS);
if (ret) {
dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed\n");
goto probe_failed;
}
/* Startup the kernel thread for this host adapter. */
DEBUG2(printk("scsi: %s: Starting kernel thread for "
"qla4xxx_dpc\n", __func__));
sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
ha->dpc_thread = create_singlethread_workqueue(buf);
if (!ha->dpc_thread) {
dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
ret = -ENODEV;
goto probe_failed;
}
INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);
ret = request_irq(pdev->irq, qla4xxx_intr_handler,
IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
if (ret) {
dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
" already in use.\n", pdev->irq);
goto probe_failed;
}
set_bit(AF_IRQ_ATTACHED, &ha->flags);
host->irq = pdev->irq;
DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
qla4xxx_enable_intrs(ha);
/* Start timer thread. */
qla4xxx_start_timer(ha, qla4xxx_timer, 1);
set_bit(AF_INIT_DONE, &ha->flags);
pci_set_drvdata(pdev, ha);
ret = scsi_add_host(host, &pdev->dev);
if (ret)
goto probe_failed;
printk(KERN_INFO
" QLogic iSCSI HBA Driver version: %s\n"
" QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
ha->patch_number, ha->build_number);
scsi_scan_host(host);
return 0;
probe_failed:
qla4xxx_free_adapter(ha);
scsi_host_put(ha->host);
probe_disable_device:
pci_disable_device(pdev);
return ret;
}
/**
* qla4xxx_remove_adapter - calback function to remove adapter.
* @pci_dev: PCI device pointer
**/
static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
{
struct scsi_qla_host *ha;
ha = pci_get_drvdata(pdev);
qla4xxx_disable_intrs(ha);
while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
ssleep(1);
/* remove devs from iscsi_sessions to scsi_devices */
qla4xxx_free_ddb_list(ha);
scsi_remove_host(ha->host);
qla4xxx_free_adapter(ha);
scsi_host_put(ha->host);
pci_set_drvdata(pdev, NULL);
}
/**
* qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
* @ha: HA context
*
* At exit, the @ha's flags.enable_64bit_addressing set to indicated
* supported addressing method.
*/
static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
{
int retval;
/* Update our PCI device dma_mask for full 64 bit mask */
if (pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(64)) == 0) {
if (pci_set_consistent_dma_mask(ha->pdev, DMA_BIT_MASK(64))) {
dev_dbg(&ha->pdev->dev,
"Failed to set 64 bit PCI consistent mask; "
"using 32 bit.\n");
retval = pci_set_consistent_dma_mask(ha->pdev,
DMA_BIT_MASK(32));
}
} else
retval = pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(32));
}
static int qla4xxx_slave_alloc(struct scsi_device *sdev)
{
struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
struct ddb_entry *ddb = sess->dd_data;
sdev->hostdata = ddb;
sdev->tagged_supported = 1;
scsi_activate_tcq(sdev, QL4_DEF_QDEPTH);
return 0;
}
static int qla4xxx_slave_configure(struct scsi_device *sdev)
{
sdev->tagged_supported = 1;
return 0;
}
static void qla4xxx_slave_destroy(struct scsi_device *sdev)
{
scsi_deactivate_tcq(sdev, 1);
}
/**
* qla4xxx_del_from_active_array - returns an active srb
* @ha: Pointer to host adapter structure.
* @index: index into to the active_array
*
* This routine removes and returns the srb at the specified index
**/
struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
{
struct srb *srb = NULL;
struct scsi_cmnd *cmd;
if (!(cmd = scsi_host_find_tag(ha->host, index)))
return srb;
if (!(srb = (struct srb *)cmd->host_scribble))
return srb;
/* update counters */
if (srb->flags & SRB_DMA_VALID) {
ha->req_q_count += srb->iocb_cnt;
ha->iocb_cnt -= srb->iocb_cnt;
if (srb->cmd)
srb->cmd->host_scribble = NULL;
}
return srb;
}
/**
* qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
* @ha: actual ha whose done queue will contain the comd returned by firmware.
* @cmd: Scsi Command to wait on.
*
* This routine waits for the command to be returned by the Firmware
* for some max time.
**/
static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
struct scsi_cmnd *cmd)
{
int done = 0;
struct srb *rp;
uint32_t max_wait_time = EH_WAIT_CMD_TOV;
do {
/* Checking to see if its returned to OS */
rp = (struct srb *) cmd->SCp.ptr;
if (rp == NULL) {
done++;
break;
}
msleep(2000);
} while (max_wait_time--);
return done;
}
/**
* qla4xxx_wait_for_hba_online - waits for HBA to come online
* @ha: Pointer to host adapter structure
**/
static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
{
unsigned long wait_online;
wait_online = jiffies + (30 * HZ);
while (time_before(jiffies, wait_online)) {
if (adapter_up(ha))
return QLA_SUCCESS;
else if (ha->retry_reset_ha_cnt == 0)
return QLA_ERROR;
msleep(2000);
}
return QLA_ERROR;
}
/**
* qla4xxx_eh_wait_for_commands - wait for active cmds to finish.
* @ha: pointer to to HBA
* @t: target id
* @l: lun id
*
* This function waits for all outstanding commands to a lun to complete. It
* returns 0 if all pending commands are returned and 1 otherwise.
**/
static int qla4xxx_eh_wait_for_commands(struct scsi_qla_host *ha,
struct scsi_target *stgt,
struct scsi_device *sdev)
{
int cnt;
int status = 0;
struct scsi_cmnd *cmd;
/*
* Waiting for all commands for the designated target or dev
* in the active array
*/
for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
cmd = scsi_host_find_tag(ha->host, cnt);
if (cmd && stgt == scsi_target(cmd->device) &&
(!sdev || sdev == cmd->device)) {
if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
status++;
break;
}
}
}
return status;
}
/**
* qla4xxx_eh_device_reset - callback for target reset.
* @cmd: Pointer to Linux's SCSI command structure
*
* This routine is called by the Linux OS to reset all luns on the
* specified target.
**/
static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
{
struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
struct ddb_entry *ddb_entry = cmd->device->hostdata;
int ret = FAILED, stat;
if (!ddb_entry)
return ret;
dev_info(&ha->pdev->dev,
"scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
cmd->device->channel, cmd->device->id, cmd->device->lun);
DEBUG2(printk(KERN_INFO
"scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
"dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
cmd, jiffies, cmd->request->timeout / HZ,
ha->dpc_flags, cmd->result, cmd->allowed));
/* FIXME: wait for hba to go online */
stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
if (stat != QLA_SUCCESS) {
dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
goto eh_dev_reset_done;
}
if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
cmd->device)) {
dev_info(&ha->pdev->dev,
"DEVICE RESET FAILED - waiting for "
"commands.\n");
goto eh_dev_reset_done;
}
/* Send marker. */
if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
MM_LUN_RESET) != QLA_SUCCESS)
goto eh_dev_reset_done;
dev_info(&ha->pdev->dev,
"scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
ha->host_no, cmd->device->channel, cmd->device->id,
cmd->device->lun);
ret = SUCCESS;
eh_dev_reset_done:
return ret;
}
/**
* qla4xxx_eh_target_reset - callback for target reset.
* @cmd: Pointer to Linux's SCSI command structure
*
* This routine is called by the Linux OS to reset the target.
**/
static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
{
struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
struct ddb_entry *ddb_entry = cmd->device->hostdata;
int stat;
if (!ddb_entry)
return FAILED;
starget_printk(KERN_INFO, scsi_target(cmd->device),
"WARM TARGET RESET ISSUED.\n");
DEBUG2(printk(KERN_INFO
"scsi%ld: TARGET_DEVICE_RESET cmd=%p jiffies = 0x%lx, "
"to=%x,dpc_flags=%lx, status=%x allowed=%d\n",
ha->host_no, cmd, jiffies, cmd->request->timeout / HZ,
ha->dpc_flags, cmd->result, cmd->allowed));
stat = qla4xxx_reset_target(ha, ddb_entry);
if (stat != QLA_SUCCESS) {
starget_printk(KERN_INFO, scsi_target(cmd->device),
"WARM TARGET RESET FAILED.\n");
return FAILED;
}
if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
NULL)) {
starget_printk(KERN_INFO, scsi_target(cmd->device),
"WARM TARGET DEVICE RESET FAILED - "
"waiting for commands.\n");
return FAILED;
}
/* Send marker. */
if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
MM_TGT_WARM_RESET) != QLA_SUCCESS) {
starget_printk(KERN_INFO, scsi_target(cmd->device),
"WARM TARGET DEVICE RESET FAILED - "
"marker iocb failed.\n");
return FAILED;
}
starget_printk(KERN_INFO, scsi_target(cmd->device),
"WARM TARGET RESET SUCCEEDED.\n");
return SUCCESS;
}
/**
* qla4xxx_eh_host_reset - kernel callback
* @cmd: Pointer to Linux's SCSI command structure
*
* This routine is invoked by the Linux kernel to perform fatal error
* recovery on the specified adapter.
**/
static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
{
int return_status = FAILED;
struct scsi_qla_host *ha;
ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
dev_info(&ha->pdev->dev,
"scsi(%ld:%d:%d:%d): HOST RESET ISSUED.\n", ha->host_no,
cmd->device->channel, cmd->device->id, cmd->device->lun);
if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host. Adapter "
"DEAD.\n", ha->host_no, cmd->device->channel,
__func__));
return FAILED;
}
/* make sure the dpc thread is stopped while we reset the hba */
clear_bit(AF_ONLINE, &ha->flags);
flush_workqueue(ha->dpc_thread);
if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS)
return_status = SUCCESS;
dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
return_status == FAILED ? "FAILED" : "SUCCEDED");
return return_status;
}
static struct pci_device_id qla4xxx_pci_tbl[] = {
{
.vendor = PCI_VENDOR_ID_QLOGIC,
.device = PCI_DEVICE_ID_QLOGIC_ISP4010,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{
.vendor = PCI_VENDOR_ID_QLOGIC,
.device = PCI_DEVICE_ID_QLOGIC_ISP4022,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{
.vendor = PCI_VENDOR_ID_QLOGIC,
.device = PCI_DEVICE_ID_QLOGIC_ISP4032,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{0, 0},
};
MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
static struct pci_driver qla4xxx_pci_driver = {
.name = DRIVER_NAME,
.id_table = qla4xxx_pci_tbl,
.probe = qla4xxx_probe_adapter,
.remove = qla4xxx_remove_adapter,
};
static int __init qla4xxx_module_init(void)
{
int ret;
/* Allocate cache for SRBs. */
srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (srb_cachep == NULL) {
printk(KERN_ERR
"%s: Unable to allocate SRB cache..."
"Failing load!\n", DRIVER_NAME);
ret = -ENOMEM;
goto no_srp_cache;
}
/* Derive version string. */
strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
if (ql4xextended_error_logging)
strcat(qla4xxx_version_str, "-debug");
qla4xxx_scsi_transport =
iscsi_register_transport(&qla4xxx_iscsi_transport);
if (!qla4xxx_scsi_transport){
ret = -ENODEV;
goto release_srb_cache;
}
ret = pci_register_driver(&qla4xxx_pci_driver);
if (ret)
goto unregister_transport;
printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
return 0;
unregister_transport:
iscsi_unregister_transport(&qla4xxx_iscsi_transport);
release_srb_cache:
kmem_cache_destroy(srb_cachep);
no_srp_cache:
return ret;
}
static void __exit qla4xxx_module_exit(void)
{
ql4_mod_unload = 1;
pci_unregister_driver(&qla4xxx_pci_driver);
iscsi_unregister_transport(&qla4xxx_iscsi_transport);
kmem_cache_destroy(srb_cachep);
}
module_init(qla4xxx_module_init);
module_exit(qla4xxx_module_exit);
MODULE_AUTHOR("QLogic Corporation");
MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(QLA4XXX_DRIVER_VERSION);