#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/gfp.h>
#include <linux/timer.h>
#include <linux/string.h>
-#include <linux/slab.h>
#include <linux/kernel.h>
+#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
+#include <scsi/scsi_transport.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
-#include <scsi/scsi_request.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
+#include "scsi_transport_api.h"
+
+#include <trace/events/scsi.h>
#define SENSE_TIMEOUT (10*HZ)
-#define START_UNIT_TIMEOUT (30*HZ)
/*
* These should *probably* be handled by the host itself.
void scsi_eh_wakeup(struct Scsi_Host *shost)
{
if (shost->host_busy == shost->host_failed) {
- up(shost->eh_wait);
+ trace_scsi_eh_wakeup(shost);
+ wake_up_process(shost->ehandler);
SCSI_LOG_ERROR_RECOVERY(5,
printk("Waking error handler thread\n"));
}
}
/**
+ * scsi_schedule_eh - schedule EH for SCSI host
+ * @shost: SCSI host to invoke error handling on.
+ *
+ * Schedule SCSI EH without scmd.
+ */
+void scsi_schedule_eh(struct Scsi_Host *shost)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(shost->host_lock, flags);
+
+ if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||
+ scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {
+ shost->host_eh_scheduled++;
+ scsi_eh_wakeup(shost);
+ }
+
+ spin_unlock_irqrestore(shost->host_lock, flags);
+}
+EXPORT_SYMBOL_GPL(scsi_schedule_eh);
+
+/**
* scsi_eh_scmd_add - add scsi cmd to error handling.
* @scmd: scmd to run eh on.
* @eh_flag: optional SCSI_EH flag.
*
* Return value:
* 0 on failure.
- **/
+ */
int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
{
struct Scsi_Host *shost = scmd->device->host;
unsigned long flags;
+ int ret = 0;
- if (shost->eh_wait == NULL)
+ if (!shost->ehandler)
return 0;
spin_lock_irqsave(shost->host_lock, flags);
+ if (scsi_host_set_state(shost, SHOST_RECOVERY))
+ if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY))
+ goto out_unlock;
+ ret = 1;
scmd->eh_eflags |= eh_flag;
list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
- scsi_host_set_state(shost, SHOST_RECOVERY);
shost->host_failed++;
scsi_eh_wakeup(shost);
+ out_unlock:
spin_unlock_irqrestore(shost->host_lock, flags);
- return 1;
-}
-
-/**
- * scsi_add_timer - Start timeout timer for a single scsi command.
- * @scmd: scsi command that is about to start running.
- * @timeout: amount of time to allow this command to run.
- * @complete: timeout function to call if timer isn't canceled.
- *
- * Notes:
- * This should be turned into an inline function. Each scsi command
- * has its own timer, and as it is added to the queue, we set up the
- * timer. When the command completes, we cancel the timer.
- **/
-void scsi_add_timer(struct scsi_cmnd *scmd, int timeout,
- void (*complete)(struct scsi_cmnd *))
-{
-
- /*
- * If the clock was already running for this command, then
- * first delete the timer. The timer handling code gets rather
- * confused if we don't do this.
- */
- if (scmd->eh_timeout.function)
- del_timer(&scmd->eh_timeout);
-
- scmd->eh_timeout.data = (unsigned long)scmd;
- scmd->eh_timeout.expires = jiffies + timeout;
- scmd->eh_timeout.function = (void (*)(unsigned long)) complete;
-
- SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:"
- " %d, (%p)\n", __FUNCTION__,
- scmd, timeout, complete));
-
- add_timer(&scmd->eh_timeout);
-}
-EXPORT_SYMBOL(scsi_add_timer);
-
-/**
- * scsi_delete_timer - Delete/cancel timer for a given function.
- * @scmd: Cmd that we are canceling timer for
- *
- * Notes:
- * This should be turned into an inline function.
- *
- * Return value:
- * 1 if we were able to detach the timer. 0 if we blew it, and the
- * timer function has already started to run.
- **/
-int scsi_delete_timer(struct scsi_cmnd *scmd)
-{
- int rtn;
-
- rtn = del_timer(&scmd->eh_timeout);
-
- SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p,"
- " rtn: %d\n", __FUNCTION__,
- scmd, rtn));
-
- scmd->eh_timeout.data = (unsigned long)NULL;
- scmd->eh_timeout.function = NULL;
-
- return rtn;
+ return ret;
}
-EXPORT_SYMBOL(scsi_delete_timer);
/**
* scsi_times_out - Timeout function for normal scsi commands.
- * @scmd: Cmd that is timing out.
+ * @req: request that is timing out.
*
* Notes:
* We do not need to lock this. There is the potential for a race
* only in that the normal completion handling might run, but if the
* normal completion function determines that the timer has already
* fired, then it mustn't do anything.
- **/
-void scsi_times_out(struct scsi_cmnd *scmd)
+ */
+enum blk_eh_timer_return scsi_times_out(struct request *req)
{
+ struct scsi_cmnd *scmd = req->special;
+ enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
+
+ trace_scsi_dispatch_cmd_timeout(scmd);
scsi_log_completion(scmd, TIMEOUT_ERROR);
- if (scmd->device->host->hostt->eh_timed_out)
- switch (scmd->device->host->hostt->eh_timed_out(scmd)) {
- case EH_HANDLED:
- __scsi_done(scmd);
- return;
- case EH_RESET_TIMER:
- /* This allows a single retry even of a command
- * with allowed == 0 */
- if (scmd->retries++ > scmd->allowed)
- break;
- scsi_add_timer(scmd, scmd->timeout_per_command,
- scsi_times_out);
- return;
- case EH_NOT_HANDLED:
- break;
- }
+ if (scmd->device->host->transportt->eh_timed_out)
+ rtn = scmd->device->host->transportt->eh_timed_out(scmd);
+ else if (scmd->device->host->hostt->eh_timed_out)
+ rtn = scmd->device->host->hostt->eh_timed_out(scmd);
- if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
- panic("Error handler thread not present at %p %p %s %d",
- scmd, scmd->device->host, __FILE__, __LINE__);
+ if (unlikely(rtn == BLK_EH_NOT_HANDLED &&
+ !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
+ scmd->result |= DID_TIME_OUT << 16;
+ rtn = BLK_EH_HANDLED;
}
+
+ return rtn;
}
/**
*
* Return value:
* 0 when dev was taken offline by error recovery. 1 OK to proceed.
- **/
+ */
int scsi_block_when_processing_errors(struct scsi_device *sdev)
{
int online;
- wait_event(sdev->host->host_wait, (sdev->host->shost_state !=
- SHOST_RECOVERY));
+ wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host));
online = scsi_device_online(sdev);
- SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __FUNCTION__,
+ SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__,
online));
return online;
* scsi_eh_prt_fail_stats - Log info on failures.
* @shost: scsi host being recovered.
* @work_q: Queue of scsi cmds to process.
- **/
+ */
static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
struct list_head *work_q)
{
if (cmd_cancel || cmd_failed) {
SCSI_LOG_ERROR_RECOVERY(3,
- printk("%s: %d:%d:%d:%d cmds failed: %d,"
- " cancel: %d\n",
- __FUNCTION__, shost->host_no,
- sdev->channel, sdev->id, sdev->lun,
- cmd_failed, cmd_cancel));
+ sdev_printk(KERN_INFO, sdev,
+ "%s: cmds failed: %d, cancel: %d\n",
+ __func__, cmd_failed,
+ cmd_cancel));
cmd_cancel = 0;
cmd_failed = 0;
++devices_failed;
* Notes:
* When a deferred error is detected the current command has
* not been executed and needs retrying.
- **/
+ */
static int scsi_check_sense(struct scsi_cmnd *scmd)
{
+ struct scsi_device *sdev = scmd->device;
struct scsi_sense_hdr sshdr;
if (! scsi_command_normalize_sense(scmd, &sshdr))
if (scsi_sense_is_deferred(&sshdr))
return NEEDS_RETRY;
+ if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh &&
+ sdev->scsi_dh_data->scsi_dh->check_sense) {
+ int rc;
+
+ rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr);
+ if (rc != SCSI_RETURN_NOT_HANDLED)
+ return rc;
+ /* handler does not care. Drop down to default handling */
+ }
+
/*
* Previous logic looked for FILEMARK, EOM or ILI which are
* mainly associated with tapes and returned SUCCESS.
return /* soft_error */ SUCCESS;
case ABORTED_COMMAND:
+ if (sshdr.asc == 0x10) /* DIF */
+ return SUCCESS;
+
return NEEDS_RETRY;
case NOT_READY:
case UNIT_ATTENTION:
return SUCCESS;
case MEDIUM_ERROR:
+ if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */
+ sshdr.asc == 0x13 || /* AMNF DATA FIELD */
+ sshdr.asc == 0x14) { /* RECORD NOT FOUND */
+ return SUCCESS;
+ }
return NEEDS_RETRY;
case HARDWARE_ERROR:
if (scmd->device->retry_hwerror)
- return NEEDS_RETRY;
+ return ADD_TO_MLQUEUE;
else
return SUCCESS;
}
}
+static void scsi_handle_queue_ramp_up(struct scsi_device *sdev)
+{
+ struct scsi_host_template *sht = sdev->host->hostt;
+ struct scsi_device *tmp_sdev;
+
+ if (!sht->change_queue_depth ||
+ sdev->queue_depth >= sdev->max_queue_depth)
+ return;
+
+ if (time_before(jiffies,
+ sdev->last_queue_ramp_up + sdev->queue_ramp_up_period))
+ return;
+
+ if (time_before(jiffies,
+ sdev->last_queue_full_time + sdev->queue_ramp_up_period))
+ return;
+
+ /*
+ * Walk all devices of a target and do
+ * ramp up on them.
+ */
+ shost_for_each_device(tmp_sdev, sdev->host) {
+ if (tmp_sdev->channel != sdev->channel ||
+ tmp_sdev->id != sdev->id ||
+ tmp_sdev->queue_depth == sdev->max_queue_depth)
+ continue;
+ /*
+ * call back into LLD to increase queue_depth by one
+ * with ramp up reason code.
+ */
+ sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1,
+ SCSI_QDEPTH_RAMP_UP);
+ sdev->last_queue_ramp_up = jiffies;
+ }
+}
+
+static void scsi_handle_queue_full(struct scsi_device *sdev)
+{
+ struct scsi_host_template *sht = sdev->host->hostt;
+ struct scsi_device *tmp_sdev;
+
+ if (!sht->change_queue_depth)
+ return;
+
+ shost_for_each_device(tmp_sdev, sdev->host) {
+ if (tmp_sdev->channel != sdev->channel ||
+ tmp_sdev->id != sdev->id)
+ continue;
+ /*
+ * We do not know the number of commands that were at
+ * the device when we got the queue full so we start
+ * from the highest possible value and work our way down.
+ */
+ sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1,
+ SCSI_QDEPTH_QFULL);
+ }
+}
+
/**
* scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
* @scmd: SCSI cmd to examine.
* queued during error recovery. the main difference here is that we
* don't allow for the possibility of retries here, and we are a lot
* more restrictive about what we consider acceptable.
- **/
+ */
static int scsi_eh_completed_normally(struct scsi_cmnd *scmd)
{
/*
*/
switch (status_byte(scmd->result)) {
case GOOD:
+ scsi_handle_queue_ramp_up(scmd->device);
case COMMAND_TERMINATED:
return SUCCESS;
case CHECK_CONDITION:
* who knows? FIXME(eric)
*/
return SUCCESS;
- case BUSY:
- case QUEUE_FULL:
case RESERVATION_CONFLICT:
+ /*
+ * let issuer deal with this, it could be just fine
+ */
+ return SUCCESS;
+ case QUEUE_FULL:
+ scsi_handle_queue_full(scmd->device);
+ /* fall through */
+ case BUSY:
default:
return FAILED;
}
}
/**
- * scsi_eh_times_out - timeout function for error handling.
- * @scmd: Cmd that is timing out.
+ * scsi_eh_done - Completion function for error handling.
+ * @scmd: Cmd that is done.
+ */
+static void scsi_eh_done(struct scsi_cmnd *scmd)
+{
+ struct completion *eh_action;
+
+ SCSI_LOG_ERROR_RECOVERY(3,
+ printk("%s scmd: %p result: %x\n",
+ __func__, scmd, scmd->result));
+
+ eh_action = scmd->device->host->eh_action;
+ if (eh_action)
+ complete(eh_action);
+}
+
+/**
+ * scsi_try_host_reset - ask host adapter to reset itself
+ * @scmd: SCSI cmd to send hsot reset.
+ */
+static int scsi_try_host_reset(struct scsi_cmnd *scmd)
+{
+ unsigned long flags;
+ int rtn;
+
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
+ __func__));
+
+ if (!scmd->device->host->hostt->eh_host_reset_handler)
+ return FAILED;
+
+ rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
+
+ if (rtn == SUCCESS) {
+ if (!scmd->device->host->hostt->skip_settle_delay)
+ ssleep(HOST_RESET_SETTLE_TIME);
+ spin_lock_irqsave(scmd->device->host->host_lock, flags);
+ scsi_report_bus_reset(scmd->device->host,
+ scmd_channel(scmd));
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
+}
+
+/**
+ * scsi_try_bus_reset - ask host to perform a bus reset
+ * @scmd: SCSI cmd to send bus reset.
+ */
+static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
+{
+ unsigned long flags;
+ int rtn;
+
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
+ __func__));
+
+ if (!scmd->device->host->hostt->eh_bus_reset_handler)
+ return FAILED;
+
+ rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
+
+ if (rtn == SUCCESS) {
+ if (!scmd->device->host->hostt->skip_settle_delay)
+ ssleep(BUS_RESET_SETTLE_TIME);
+ spin_lock_irqsave(scmd->device->host->host_lock, flags);
+ scsi_report_bus_reset(scmd->device->host,
+ scmd_channel(scmd));
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
+}
+
+static void __scsi_report_device_reset(struct scsi_device *sdev, void *data)
+{
+ sdev->was_reset = 1;
+ sdev->expecting_cc_ua = 1;
+}
+
+/**
+ * scsi_try_target_reset - Ask host to perform a target reset
+ * @scmd: SCSI cmd used to send a target reset
*
* Notes:
- * During error handling, the kernel thread will be sleeping waiting
- * for some action to complete on the device. our only job is to
- * record that it timed out, and to wake up the thread.
- **/
-static void scsi_eh_times_out(struct scsi_cmnd *scmd)
+ * There is no timeout for this operation. if this operation is
+ * unreliable for a given host, then the host itself needs to put a
+ * timer on it, and set the host back to a consistent state prior to
+ * returning.
+ */
+static int scsi_try_target_reset(struct scsi_cmnd *scmd)
{
- scmd->eh_eflags |= SCSI_EH_REC_TIMEOUT;
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd:%p\n", __FUNCTION__,
- scmd));
+ unsigned long flags;
+ int rtn;
+
+ if (!scmd->device->host->hostt->eh_target_reset_handler)
+ return FAILED;
- up(scmd->device->host->eh_action);
+ rtn = scmd->device->host->hostt->eh_target_reset_handler(scmd);
+ if (rtn == SUCCESS) {
+ spin_lock_irqsave(scmd->device->host->host_lock, flags);
+ __starget_for_each_device(scsi_target(scmd->device), NULL,
+ __scsi_report_device_reset);
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
}
/**
- * scsi_eh_done - Completion function for error handling.
- * @scmd: Cmd that is done.
- **/
-static void scsi_eh_done(struct scsi_cmnd *scmd)
+ * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
+ * @scmd: SCSI cmd used to send BDR
+ *
+ * Notes:
+ * There is no timeout for this operation. if this operation is
+ * unreliable for a given host, then the host itself needs to put a
+ * timer on it, and set the host back to a consistent state prior to
+ * returning.
+ */
+static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
{
- /*
- * if the timeout handler is already running, then just set the
- * flag which says we finished late, and return. we have no
- * way of stopping the timeout handler from running, so we must
- * always defer to it.
- */
- if (del_timer(&scmd->eh_timeout)) {
- scmd->request->rq_status = RQ_SCSI_DONE;
+ int rtn;
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s scmd: %p result: %x\n",
- __FUNCTION__, scmd, scmd->result));
+ if (!scmd->device->host->hostt->eh_device_reset_handler)
+ return FAILED;
- up(scmd->device->host->eh_action);
- }
+ rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
+ if (rtn == SUCCESS)
+ __scsi_report_device_reset(scmd->device, NULL);
+ return rtn;
+}
+
+static int __scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
+{
+ if (!scmd->device->host->hostt->eh_abort_handler)
+ return FAILED;
+
+ return scmd->device->host->hostt->eh_abort_handler(scmd);
}
/**
- * scsi_send_eh_cmnd - send a cmd to a device as part of error recovery.
- * @scmd: SCSI Cmd to send.
- * @timeout: Timeout for cmd.
+ * scsi_try_to_abort_cmd - Ask host to abort a running command.
+ * @scmd: SCSI cmd to abort from Lower Level.
*
* Notes:
- * The initialization of the structures is quite a bit different in
- * this case, and furthermore, there is a different completion handler
- * vs scsi_dispatch_cmd.
- * Return value:
- * SUCCESS or FAILED or NEEDS_RETRY
- **/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
+ * This function will not return until the user's completion function
+ * has been called. there is no timeout on this operation. if the
+ * author of the low-level driver wishes this operation to be timed,
+ * they can provide this facility themselves. helper functions in
+ * scsi_error.c can be supplied to make this easier to do.
+ */
+static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
+{
+ /*
+ * scsi_done was called just after the command timed out and before
+ * we had a chance to process it. (db)
+ */
+ if (scmd->serial_number == 0)
+ return SUCCESS;
+ return __scsi_try_to_abort_cmd(scmd);
+}
+
+static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd)
+{
+ if (__scsi_try_to_abort_cmd(scmd) != SUCCESS)
+ if (scsi_try_bus_device_reset(scmd) != SUCCESS)
+ if (scsi_try_target_reset(scmd) != SUCCESS)
+ if (scsi_try_bus_reset(scmd) != SUCCESS)
+ scsi_try_host_reset(scmd);
+}
+
+/**
+ * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory
+ * @scmd: SCSI command structure to hijack
+ * @ses: structure to save restore information
+ * @cmnd: CDB to send. Can be NULL if no new cmnd is needed
+ * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB)
+ * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
+ *
+ * This function is used to save a scsi command information before re-execution
+ * as part of the error recovery process. If @sense_bytes is 0 the command
+ * sent must be one that does not transfer any data. If @sense_bytes != 0
+ * @cmnd is ignored and this functions sets up a REQUEST_SENSE command
+ * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer.
+ */
+void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
+ unsigned char *cmnd, int cmnd_size, unsigned sense_bytes)
{
struct scsi_device *sdev = scmd->device;
- struct Scsi_Host *shost = sdev->host;
- DECLARE_MUTEX_LOCKED(sem);
- unsigned long flags;
- int rtn = SUCCESS;
/*
- * we will use a queued command if possible, otherwise we will
- * emulate the queuing and calling of completion function ourselves.
+ * We need saved copies of a number of fields - this is because
+ * error handling may need to overwrite these with different values
+ * to run different commands, and once error handling is complete,
+ * we will need to restore these values prior to running the actual
+ * command.
*/
- if (sdev->scsi_level <= SCSI_2)
+ ses->cmd_len = scmd->cmd_len;
+ ses->cmnd = scmd->cmnd;
+ ses->data_direction = scmd->sc_data_direction;
+ ses->sdb = scmd->sdb;
+ ses->next_rq = scmd->request->next_rq;
+ ses->result = scmd->result;
+ ses->underflow = scmd->underflow;
+ ses->prot_op = scmd->prot_op;
+
+ scmd->prot_op = SCSI_PROT_NORMAL;
+ scmd->cmnd = ses->eh_cmnd;
+ memset(scmd->cmnd, 0, BLK_MAX_CDB);
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
+ scmd->request->next_rq = NULL;
+
+ if (sense_bytes) {
+ scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,
+ sense_bytes);
+ sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
+ scmd->sdb.length);
+ scmd->sdb.table.sgl = &ses->sense_sgl;
+ scmd->sc_data_direction = DMA_FROM_DEVICE;
+ scmd->sdb.table.nents = 1;
+ scmd->cmnd[0] = REQUEST_SENSE;
+ scmd->cmnd[4] = scmd->sdb.length;
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+ } else {
+ scmd->sc_data_direction = DMA_NONE;
+ if (cmnd) {
+ BUG_ON(cmnd_size > BLK_MAX_CDB);
+ memcpy(scmd->cmnd, cmnd, cmnd_size);
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+ }
+ }
+
+ scmd->underflow = 0;
+
+ if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN)
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
(sdev->lun << 5 & 0xe0);
- scsi_add_timer(scmd, timeout, scsi_eh_times_out);
+ /*
+ * Zero the sense buffer. The scsi spec mandates that any
+ * untransferred sense data should be interpreted as being zero.
+ */
+ memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+}
+EXPORT_SYMBOL(scsi_eh_prep_cmnd);
+/**
+ * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory
+ * @scmd: SCSI command structure to restore
+ * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd
+ *
+ * Undo any damage done by above scsi_eh_prep_cmnd().
+ */
+void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
+{
/*
- * set up the semaphore so we wait for the command to complete.
+ * Restore original data
*/
- shost->eh_action = &sem;
- scmd->request->rq_status = RQ_SCSI_BUSY;
+ scmd->cmd_len = ses->cmd_len;
+ scmd->cmnd = ses->cmnd;
+ scmd->sc_data_direction = ses->data_direction;
+ scmd->sdb = ses->sdb;
+ scmd->request->next_rq = ses->next_rq;
+ scmd->result = ses->result;
+ scmd->underflow = ses->underflow;
+ scmd->prot_op = ses->prot_op;
+}
+EXPORT_SYMBOL(scsi_eh_restore_cmnd);
+
+/**
+ * scsi_send_eh_cmnd - submit a scsi command as part of error recory
+ * @scmd: SCSI command structure to hijack
+ * @cmnd: CDB to send
+ * @cmnd_size: size in bytes of @cmnd
+ * @timeout: timeout for this request
+ * @sense_bytes: size of sense data to copy or 0
+ *
+ * This function is used to send a scsi command down to a target device
+ * as part of the error recovery process. See also scsi_eh_prep_cmnd() above.
+ *
+ * Return value:
+ * SUCCESS or FAILED or NEEDS_RETRY
+ */
+static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
+ int cmnd_size, int timeout, unsigned sense_bytes)
+{
+ struct scsi_device *sdev = scmd->device;
+ struct Scsi_Host *shost = sdev->host;
+ DECLARE_COMPLETION_ONSTACK(done);
+ unsigned long timeleft;
+ unsigned long flags;
+ struct scsi_eh_save ses;
+ int rtn;
+
+ scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes);
+ shost->eh_action = &done;
spin_lock_irqsave(shost->host_lock, flags);
scsi_log_send(scmd);
shost->hostt->queuecommand(scmd, scsi_eh_done);
spin_unlock_irqrestore(shost->host_lock, flags);
- down(&sem);
- scsi_log_completion(scmd, SUCCESS);
+ timeleft = wait_for_completion_timeout(&done, timeout);
shost->eh_action = NULL;
- /*
- * see if timeout. if so, tell the host to forget about it.
- * in other words, we don't want a callback any more.
- */
- if (scmd->eh_eflags & SCSI_EH_REC_TIMEOUT) {
- scmd->eh_eflags &= ~SCSI_EH_REC_TIMEOUT;
-
- /*
- * as far as the low level driver is
- * concerned, this command is still active, so
- * we must give the low level driver a chance
- * to abort it. (db)
- *
- * FIXME(eric) - we are not tracking whether we could
- * abort a timed out command or not. not sure how
- * we should treat them differently anyways.
- */
- if (shost->hostt->eh_abort_handler)
- shost->hostt->eh_abort_handler(scmd);
-
- scmd->request->rq_status = RQ_SCSI_DONE;
- rtn = FAILED;
- }
+ scsi_log_completion(scmd, SUCCESS);
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd: %p, rtn:%x\n",
- __FUNCTION__, scmd, rtn));
+ SCSI_LOG_ERROR_RECOVERY(3,
+ printk("%s: scmd: %p, timeleft: %ld\n",
+ __func__, scmd, timeleft));
/*
- * now examine the actual status codes to see whether the command
- * actually did complete normally.
+ * If there is time left scsi_eh_done got called, and we will
+ * examine the actual status codes to see whether the command
+ * actually did complete normally, else tell the host to forget
+ * about this command.
*/
- if (rtn == SUCCESS) {
+ if (timeleft) {
rtn = scsi_eh_completed_normally(scmd);
SCSI_LOG_ERROR_RECOVERY(3,
printk("%s: scsi_eh_completed_normally %x\n",
- __FUNCTION__, rtn));
+ __func__, rtn));
+
switch (rtn) {
case SUCCESS:
case NEEDS_RETRY:
case FAILED:
break;
+ case ADD_TO_MLQUEUE:
+ rtn = NEEDS_RETRY;
+ break;
default:
rtn = FAILED;
break;
}
+ } else {
+ scsi_abort_eh_cmnd(scmd);
+ rtn = FAILED;
}
+ scsi_eh_restore_cmnd(scmd, &ses);
return rtn;
}
* Some hosts automatically obtain this information, others require
* that we obtain it on our own. This function will *not* return until
* the command either times out, or it completes.
- **/
+ */
static int scsi_request_sense(struct scsi_cmnd *scmd)
{
- static unsigned char generic_sense[6] =
- {REQUEST_SENSE, 0, 0, 0, 252, 0};
- unsigned char *scsi_result;
- int saved_result;
- int rtn;
-
- memcpy(scmd->cmnd, generic_sense, sizeof(generic_sense));
-
- scsi_result = kmalloc(252, GFP_ATOMIC | ((scmd->device->host->hostt->unchecked_isa_dma) ? __GFP_DMA : 0));
-
-
- if (unlikely(!scsi_result)) {
- printk(KERN_ERR "%s: cannot allocate scsi_result.\n",
- __FUNCTION__);
- return FAILED;
- }
-
- /*
- * zero the sense buffer. some host adapters automatically always
- * request sense, so it is not a good idea that
- * scmd->request_buffer and scmd->sense_buffer point to the same
- * address (db). 0 is not a valid sense code.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
- memset(scsi_result, 0, 252);
-
- saved_result = scmd->result;
- scmd->request_buffer = scsi_result;
- scmd->request_bufflen = 252;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->sc_data_direction = DMA_FROM_DEVICE;
- scmd->underflow = 0;
-
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);
-
- /* last chance to have valid sense data */
- if(!SCSI_SENSE_VALID(scmd)) {
- memcpy(scmd->sense_buffer, scmd->request_buffer,
- sizeof(scmd->sense_buffer));
- }
-
- kfree(scsi_result);
-
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
- return rtn;
+ return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0);
}
/**
* Notes:
* We don't want to use the normal command completion while we are are
* still handling errors - it may cause other commands to be queued,
- * and that would disturb what we are doing. thus we really want to
+ * and that would disturb what we are doing. Thus we really want to
* keep a list of pending commands for final completion, and once we
* are ready to leave error handling we handle completion for real.
- **/
-static void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
- struct list_head *done_q)
+ */
+void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
{
scmd->device->host->host_failed--;
scmd->eh_eflags = 0;
-
- /*
- * set this back so that the upper level can correctly free up
- * things.
- */
- scsi_setup_cmd_retry(scmd);
list_move_tail(&scmd->eh_entry, done_q);
}
+EXPORT_SYMBOL(scsi_eh_finish_cmd);
/**
* scsi_eh_get_sense - Get device sense data.
* @work_q: Queue of commands to process.
- * @done_q: Queue of proccessed commands..
+ * @done_q: Queue of processed commands.
*
* Description:
* See if we need to request sense information. if so, then get it
*
* Notes:
* This has the unfortunate side effect that if a shost adapter does
- * not automatically request sense information, that we end up shutting
+ * not automatically request sense information, we end up shutting
* it down before we request it.
*
* All drivers should request sense information internally these days,
*
* XXX: Long term this code should go away, but that needs an audit of
* all LLDDs first.
- **/
-static int scsi_eh_get_sense(struct list_head *work_q,
- struct list_head *done_q)
+ */
+int scsi_eh_get_sense(struct list_head *work_q,
+ struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
int rtn;
SCSI_SENSE_VALID(scmd))
continue;
- SCSI_LOG_ERROR_RECOVERY(2, printk("%s: requesting sense"
- " for id: %d\n",
- current->comm,
- scmd->device->id));
+ SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd,
+ "%s: requesting sense\n",
+ current->comm));
rtn = scsi_request_sense(scmd);
if (rtn != SUCCESS)
continue;
return list_empty(work_q);
}
-
-/**
- * scsi_try_to_abort_cmd - Ask host to abort a running command.
- * @scmd: SCSI cmd to abort from Lower Level.
- *
- * Notes:
- * This function will not return until the user's completion function
- * has been called. there is no timeout on this operation. if the
- * author of the low-level driver wishes this operation to be timed,
- * they can provide this facility themselves. helper functions in
- * scsi_error.c can be supplied to make this easier to do.
- **/
-static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
-{
- if (!scmd->device->host->hostt->eh_abort_handler)
- return FAILED;
-
- /*
- * scsi_done was called just after the command timed out and before
- * we had a chance to process it. (db)
- */
- if (scmd->serial_number == 0)
- return SUCCESS;
- return scmd->device->host->hostt->eh_abort_handler(scmd);
-}
+EXPORT_SYMBOL_GPL(scsi_eh_get_sense);
/**
* scsi_eh_tur - Send TUR to device.
- * @scmd: Scsi cmd to send TUR
+ * @scmd: &scsi_cmnd to send TUR
*
* Return value:
* 0 - Device is ready. 1 - Device NOT ready.
- **/
+ */
static int scsi_eh_tur(struct scsi_cmnd *scmd)
{
static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
int retry_cnt = 1, rtn;
- int saved_result;
retry_tur:
- memcpy(scmd->cmnd, tur_command, sizeof(tur_command));
-
- /*
- * zero the sense buffer. the scsi spec mandates that any
- * untransferred sense data should be interpreted as being zero.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
-
- saved_result = scmd->result;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->underflow = 0;
- scmd->sc_data_direction = DMA_NONE;
-
- rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);
-
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
+ rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0);
- /*
- * hey, we are done. let's look to see what happened.
- */
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
- __FUNCTION__, scmd, rtn));
- if (rtn == SUCCESS)
- return 0;
- else if (rtn == NEEDS_RETRY) {
+ __func__, scmd, rtn));
+
+ switch (rtn) {
+ case NEEDS_RETRY:
if (retry_cnt--)
goto retry_tur;
+ /*FALLTHRU*/
+ case SUCCESS:
return 0;
+ default:
+ return 1;
}
- return 1;
}
/**
- * scsi_eh_abort_cmds - abort canceled commands.
- * @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
+ * scsi_eh_abort_cmds - abort pending commands.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
*
* Decription:
* Try and see whether or not it makes sense to try and abort the
- * running command. this only works out to be the case if we have one
- * command that has timed out. if the command simply failed, it makes
+ * running command. This only works out to be the case if we have one
+ * command that has timed out. If the command simply failed, it makes
* no sense to try and abort the command, since as far as the shost
* adapter is concerned, it isn't running.
- **/
+ */
static int scsi_eh_abort_cmds(struct list_head *work_q,
struct list_head *done_q)
{
"0x%p\n", current->comm,
scmd));
rtn = scsi_try_to_abort_cmd(scmd);
- if (rtn == SUCCESS) {
+ if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD;
if (!scsi_device_online(scmd->device) ||
+ rtn == FAST_IO_FAIL ||
!scsi_eh_tur(scmd)) {
scsi_eh_finish_cmd(scmd, done_q);
}
}
/**
- * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
- * @scmd: SCSI cmd used to send BDR
- *
- * Notes:
- * There is no timeout for this operation. if this operation is
- * unreliable for a given host, then the host itself needs to put a
- * timer on it, and set the host back to a consistent state prior to
- * returning.
- **/
-static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
-{
- int rtn;
-
- if (!scmd->device->host->hostt->eh_device_reset_handler)
- return FAILED;
-
- rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
- if (rtn == SUCCESS) {
- scmd->device->was_reset = 1;
- scmd->device->expecting_cc_ua = 1;
- }
-
- return rtn;
-}
-
-/**
* scsi_eh_try_stu - Send START_UNIT to device.
- * @scmd: Scsi cmd to send START_UNIT
+ * @scmd: &scsi_cmnd to send START_UNIT
*
* Return value:
* 0 - Device is ready. 1 - Device NOT ready.
- **/
+ */
static int scsi_eh_try_stu(struct scsi_cmnd *scmd)
{
static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
- int rtn;
- int saved_result;
-
- if (!scmd->device->allow_restart)
- return 1;
-
- memcpy(scmd->cmnd, stu_command, sizeof(stu_command));
-
- /*
- * zero the sense buffer. the scsi spec mandates that any
- * untransferred sense data should be interpreted as being zero.
- */
- memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
- saved_result = scmd->result;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
- scmd->use_sg = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- scmd->underflow = 0;
- scmd->sc_data_direction = DMA_NONE;
+ if (scmd->device->allow_restart) {
+ int i, rtn = NEEDS_RETRY;
- rtn = scsi_send_eh_cmnd(scmd, START_UNIT_TIMEOUT);
+ for (i = 0; rtn == NEEDS_RETRY && i < 2; i++)
+ rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0);
- /*
- * when we eventually call scsi_finish, we really wish to complete
- * the original request, so let's restore the original data. (db)
- */
- scsi_setup_cmd_retry(scmd);
- scmd->result = saved_result;
+ if (rtn == SUCCESS)
+ return 0;
+ }
- /*
- * hey, we are done. let's look to see what happened.
- */
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
- __FUNCTION__, scmd, rtn));
- if (rtn == SUCCESS)
- return 0;
return 1;
}
/**
* scsi_eh_stu - send START_UNIT if needed
- * @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
+ * @shost: &scsi host being recovered.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
*
* Notes:
* If commands are failing due to not ready, initializing command required,
* try revalidating the device, which will end up sending a start unit.
- **/
+ */
static int scsi_eh_stu(struct Scsi_Host *shost,
struct list_head *work_q,
struct list_head *done_q)
/**
* scsi_eh_bus_device_reset - send bdr if needed
* @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
*
* Notes:
- * Try a bus device reset. still, look to see whether we have multiple
+ * Try a bus device reset. Still, look to see whether we have multiple
* devices that are jammed or not - if we have multiple devices, it
* makes no sense to try bus_device_reset - we really would need to try
* a bus_reset instead.
- **/
+ */
static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
struct list_head *work_q,
struct list_head *done_q)
" 0x%p\n", current->comm,
sdev));
rtn = scsi_try_bus_device_reset(bdr_scmd);
- if (rtn == SUCCESS) {
+ if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
if (!scsi_device_online(sdev) ||
+ rtn == FAST_IO_FAIL ||
!scsi_eh_tur(bdr_scmd)) {
list_for_each_entry_safe(scmd, next,
work_q, eh_entry) {
}
/**
- * scsi_try_bus_reset - ask host to perform a bus reset
- * @scmd: SCSI cmd to send bus reset.
- **/
-static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
-{
- unsigned long flags;
- int rtn;
-
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
- __FUNCTION__));
-
- if (!scmd->device->host->hostt->eh_bus_reset_handler)
- return FAILED;
-
- rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
-
- if (rtn == SUCCESS) {
- if (!scmd->device->host->hostt->skip_settle_delay)
- ssleep(BUS_RESET_SETTLE_TIME);
- spin_lock_irqsave(scmd->device->host->host_lock, flags);
- scsi_report_bus_reset(scmd->device->host, scmd->device->channel);
- spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
- }
-
- return rtn;
-}
-
-/**
- * scsi_try_host_reset - ask host adapter to reset itself
- * @scmd: SCSI cmd to send hsot reset.
- **/
-static int scsi_try_host_reset(struct scsi_cmnd *scmd)
+ * scsi_eh_target_reset - send target reset if needed
+ * @shost: scsi host being recovered.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
+ *
+ * Notes:
+ * Try a target reset.
+ */
+static int scsi_eh_target_reset(struct Scsi_Host *shost,
+ struct list_head *work_q,
+ struct list_head *done_q)
{
- unsigned long flags;
+ struct scsi_cmnd *scmd, *tgtr_scmd, *next;
+ unsigned int id = 0;
int rtn;
- SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
- __FUNCTION__));
-
- if (!scmd->device->host->hostt->eh_host_reset_handler)
- return FAILED;
-
- rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
+ do {
+ tgtr_scmd = NULL;
+ list_for_each_entry(scmd, work_q, eh_entry) {
+ if (id == scmd_id(scmd)) {
+ tgtr_scmd = scmd;
+ break;
+ }
+ }
+ if (!tgtr_scmd) {
+ /* not one exactly equal; find the next highest */
+ list_for_each_entry(scmd, work_q, eh_entry) {
+ if (scmd_id(scmd) > id &&
+ (!tgtr_scmd ||
+ scmd_id(tgtr_scmd) > scmd_id(scmd)))
+ tgtr_scmd = scmd;
+ }
+ }
+ if (!tgtr_scmd)
+ /* no more commands, that's it */
+ break;
- if (rtn == SUCCESS) {
- if (!scmd->device->host->hostt->skip_settle_delay)
- ssleep(HOST_RESET_SETTLE_TIME);
- spin_lock_irqsave(scmd->device->host->host_lock, flags);
- scsi_report_bus_reset(scmd->device->host, scmd->device->channel);
- spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
- }
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset "
+ "to target %d\n",
+ current->comm, id));
+ rtn = scsi_try_target_reset(tgtr_scmd);
+ if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
+ list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
+ if (id == scmd_id(scmd))
+ if (!scsi_device_online(scmd->device) ||
+ rtn == FAST_IO_FAIL ||
+ !scsi_eh_tur(tgtr_scmd))
+ scsi_eh_finish_cmd(scmd,
+ done_q);
+ }
+ } else
+ SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset"
+ " failed target: "
+ "%d\n",
+ current->comm, id));
+ id++;
+ } while(id != 0);
- return rtn;
+ return list_empty(work_q);
}
/**
* scsi_eh_bus_reset - send a bus reset
- * @shost: scsi host being recovered.
- * @eh_done_q: list_head for processed commands.
- **/
+ * @shost: &scsi host being recovered.
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
+ */
static int scsi_eh_bus_reset(struct Scsi_Host *shost,
struct list_head *work_q,
struct list_head *done_q)
for (channel = 0; channel <= shost->max_channel; channel++) {
chan_scmd = NULL;
list_for_each_entry(scmd, work_q, eh_entry) {
- if (channel == scmd->device->channel) {
+ if (channel == scmd_channel(scmd)) {
chan_scmd = scmd;
break;
/*
" %d\n", current->comm,
channel));
rtn = scsi_try_bus_reset(chan_scmd);
- if (rtn == SUCCESS) {
+ if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
- if (channel == scmd->device->channel)
+ if (channel == scmd_channel(scmd))
if (!scsi_device_online(scmd->device) ||
+ rtn == FAST_IO_FAIL ||
!scsi_eh_tur(scmd))
scsi_eh_finish_cmd(scmd,
done_q);
* scsi_eh_host_reset - send a host reset
* @work_q: list_head for processed commands.
* @done_q: list_head for processed commands.
- **/
+ */
static int scsi_eh_host_reset(struct list_head *work_q,
struct list_head *done_q)
{
, current->comm));
rtn = scsi_try_host_reset(scmd);
- if (rtn == SUCCESS) {
+ if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
if (!scsi_device_online(scmd->device) ||
+ rtn == FAST_IO_FAIL ||
(!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) ||
!scsi_eh_tur(scmd))
scsi_eh_finish_cmd(scmd, done_q);
* scsi_eh_offline_sdevs - offline scsi devices that fail to recover
* @work_q: list_head for processed commands.
* @done_q: list_head for processed commands.
- *
- **/
+ */
static void scsi_eh_offline_sdevs(struct list_head *work_q,
struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
- printk(KERN_INFO "scsi: Device offlined - not"
- " ready after error recovery: host"
- " %d channel %d id %d lun %d\n",
- scmd->device->host->host_no,
- scmd->device->channel,
- scmd->device->id,
- scmd->device->lun);
+ sdev_printk(KERN_INFO, scmd->device, "Device offlined - "
+ "not ready after error recovery\n");
scsi_device_set_state(scmd->device, SDEV_OFFLINE);
if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) {
/*
}
/**
+ * scsi_noretry_cmd - determinte if command should be failed fast
+ * @scmd: SCSI cmd to examine.
+ */
+int scsi_noretry_cmd(struct scsi_cmnd *scmd)
+{
+ switch (host_byte(scmd->result)) {
+ case DID_OK:
+ break;
+ case DID_BUS_BUSY:
+ return blk_failfast_transport(scmd->request);
+ case DID_PARITY:
+ return blk_failfast_dev(scmd->request);
+ case DID_ERROR:
+ if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
+ status_byte(scmd->result) == RESERVATION_CONFLICT)
+ return 0;
+ /* fall through */
+ case DID_SOFT_ERROR:
+ return blk_failfast_driver(scmd->request);
+ }
+
+ switch (status_byte(scmd->result)) {
+ case CHECK_CONDITION:
+ /*
+ * assume caller has checked sense and determinted
+ * the check condition was retryable.
+ */
+ return blk_failfast_dev(scmd->request);
+ }
+
+ return 0;
+}
+
+/**
* scsi_decide_disposition - Disposition a cmd on return from LLD.
* @scmd: SCSI cmd to examine.
*
* is woken. In cases where the error code indicates an error that
* doesn't require the error handler read (i.e. we don't need to
* abort/reset), this function should return SUCCESS.
- **/
+ */
int scsi_decide_disposition(struct scsi_cmnd *scmd)
{
int rtn;
if (!scsi_device_online(scmd->device)) {
SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report"
" as SUCCESS\n",
- __FUNCTION__));
+ __func__));
return SUCCESS;
}
case DID_REQUEUE:
return ADD_TO_MLQUEUE;
-
+ case DID_TRANSPORT_DISRUPTED:
+ /*
+ * LLD/transport was disrupted during processing of the IO.
+ * The transport class is now blocked/blocking,
+ * and the transport will decide what to do with the IO
+ * based on its timers and recovery capablilities if
+ * there are enough retries.
+ */
+ goto maybe_retry;
+ case DID_TRANSPORT_FAILFAST:
+ /*
+ * The transport decided to failfast the IO (most likely
+ * the fast io fail tmo fired), so send IO directly upwards.
+ */
+ return SUCCESS;
case DID_ERROR:
if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
status_byte(scmd->result) == RESERVATION_CONFLICT)
*/
switch (status_byte(scmd->result)) {
case QUEUE_FULL:
+ scsi_handle_queue_full(scmd->device);
/*
* the case of trying to send too many commands to a
* tagged queueing device.
*/
return ADD_TO_MLQUEUE;
case GOOD:
+ scsi_handle_queue_ramp_up(scmd->device);
case COMMAND_TERMINATED:
- case TASK_ABORTED:
return SUCCESS;
+ case TASK_ABORTED:
+ goto maybe_retry;
case CHECK_CONDITION:
rtn = scsi_check_sense(scmd);
if (rtn == NEEDS_RETRY)
return SUCCESS;
case RESERVATION_CONFLICT:
- printk(KERN_INFO "scsi: reservation conflict: host"
- " %d channel %d id %d lun %d\n",
- scmd->device->host->host_no, scmd->device->channel,
- scmd->device->id, scmd->device->lun);
+ sdev_printk(KERN_INFO, scmd->device,
+ "reservation conflict\n");
return SUCCESS; /* causes immediate i/o error */
default:
return FAILED;
* the request was not marked fast fail. Note that above,
* even if the request is marked fast fail, we still requeue
* for queue congestion conditions (QUEUE_FULL or BUSY) */
- if ((++scmd->retries) < scmd->allowed
- && !blk_noretry_request(scmd->request)) {
+ if ((++scmd->retries) <= scmd->allowed
+ && !scsi_noretry_cmd(scmd)) {
return NEEDS_RETRY;
} else {
/*
}
}
-/**
- * scsi_eh_lock_done - done function for eh door lock request
- * @scmd: SCSI command block for the door lock request
- *
- * Notes:
- * We completed the asynchronous door lock request, and it has either
- * locked the door or failed. We must free the command structures
- * associated with this request.
- **/
-static void scsi_eh_lock_done(struct scsi_cmnd *scmd)
+static void eh_lock_door_done(struct request *req, int uptodate)
{
- struct scsi_request *sreq = scmd->sc_request;
-
- scsi_release_request(sreq);
+ __blk_put_request(req->q, req);
}
-
/**
* scsi_eh_lock_door - Prevent medium removal for the specified device
* @sdev: SCSI device to prevent medium removal
*
* Locking:
- * We must be called from process context; scsi_allocate_request()
- * may sleep.
+ * We must be called from process context.
*
* Notes:
* We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
* head of the devices request queue, and continue.
- *
- * Bugs:
- * scsi_allocate_request() may sleep waiting for existing requests to
- * be processed. However, since we haven't kicked off any request
- * processing for this host, this may deadlock.
- *
- * If scsi_allocate_request() fails for what ever reason, we
- * completely forget to lock the door.
- **/
+ */
static void scsi_eh_lock_door(struct scsi_device *sdev)
{
- struct scsi_request *sreq = scsi_allocate_request(sdev, GFP_KERNEL);
+ struct request *req;
- if (unlikely(!sreq)) {
- printk(KERN_ERR "%s: request allocate failed,"
- "prevent media removal cmd not sent\n", __FUNCTION__);
- return;
- }
+ /*
+ * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a
+ * request becomes available
+ */
+ req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL);
- sreq->sr_cmnd[0] = ALLOW_MEDIUM_REMOVAL;
- sreq->sr_cmnd[1] = 0;
- sreq->sr_cmnd[2] = 0;
- sreq->sr_cmnd[3] = 0;
- sreq->sr_cmnd[4] = SCSI_REMOVAL_PREVENT;
- sreq->sr_cmnd[5] = 0;
- sreq->sr_data_direction = DMA_NONE;
- sreq->sr_bufflen = 0;
- sreq->sr_buffer = NULL;
- sreq->sr_allowed = 5;
- sreq->sr_done = scsi_eh_lock_done;
- sreq->sr_timeout_per_command = 10 * HZ;
- sreq->sr_cmd_len = COMMAND_SIZE(sreq->sr_cmnd[0]);
-
- scsi_insert_special_req(sreq, 1);
-}
+ req->cmd[0] = ALLOW_MEDIUM_REMOVAL;
+ req->cmd[1] = 0;
+ req->cmd[2] = 0;
+ req->cmd[3] = 0;
+ req->cmd[4] = SCSI_REMOVAL_PREVENT;
+ req->cmd[5] = 0;
+ req->cmd_len = COMMAND_SIZE(req->cmd[0]);
+
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ req->cmd_flags |= REQ_QUIET;
+ req->timeout = 10 * HZ;
+ req->retries = 5;
+
+ blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done);
+}
/**
* scsi_restart_operations - restart io operations to the specified host.
* Notes:
* When we entered the error handler, we blocked all further i/o to
* this device. we need to 'reverse' this process.
- **/
+ */
static void scsi_restart_operations(struct Scsi_Host *shost)
{
struct scsi_device *sdev;
+ unsigned long flags;
/*
* If the door was locked, we need to insert a door lock request
* ioctls to queued block devices.
*/
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n",
- __FUNCTION__));
+ __func__));
- scsi_host_set_state(shost, SHOST_RUNNING);
+ spin_lock_irqsave(shost->host_lock, flags);
+ if (scsi_host_set_state(shost, SHOST_RUNNING))
+ if (scsi_host_set_state(shost, SHOST_CANCEL))
+ BUG_ON(scsi_host_set_state(shost, SHOST_DEL));
+ spin_unlock_irqrestore(shost->host_lock, flags);
wake_up(&shost->host_wait);
/**
* scsi_eh_ready_devs - check device ready state and recover if not.
* @shost: host to be recovered.
- * @eh_done_q: list_head for processed commands.
- *
- **/
-static void scsi_eh_ready_devs(struct Scsi_Host *shost,
- struct list_head *work_q,
- struct list_head *done_q)
+ * @work_q: &list_head for pending commands.
+ * @done_q: &list_head for processed commands.
+ */
+void scsi_eh_ready_devs(struct Scsi_Host *shost,
+ struct list_head *work_q,
+ struct list_head *done_q)
{
if (!scsi_eh_stu(shost, work_q, done_q))
if (!scsi_eh_bus_device_reset(shost, work_q, done_q))
- if (!scsi_eh_bus_reset(shost, work_q, done_q))
- if (!scsi_eh_host_reset(work_q, done_q))
- scsi_eh_offline_sdevs(work_q, done_q);
+ if (!scsi_eh_target_reset(shost, work_q, done_q))
+ if (!scsi_eh_bus_reset(shost, work_q, done_q))
+ if (!scsi_eh_host_reset(work_q, done_q))
+ scsi_eh_offline_sdevs(work_q,
+ done_q);
}
+EXPORT_SYMBOL_GPL(scsi_eh_ready_devs);
/**
* scsi_eh_flush_done_q - finish processed commands or retry them.
* @done_q: list_head of processed commands.
- *
- **/
-static void scsi_eh_flush_done_q(struct list_head *done_q)
+ */
+void scsi_eh_flush_done_q(struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
list_del_init(&scmd->eh_entry);
if (scsi_device_online(scmd->device) &&
- !blk_noretry_request(scmd->request) &&
- (++scmd->retries < scmd->allowed)) {
+ !scsi_noretry_cmd(scmd) &&
+ (++scmd->retries <= scmd->allowed)) {
SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush"
" retry cmd: %p\n",
current->comm,
}
}
}
+EXPORT_SYMBOL(scsi_eh_flush_done_q);
/**
* scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
* scsi_finish_cmd() called for it. we do all of the retry stuff
* here, so when we restart the host after we return it should have an
* empty queue.
- **/
+ */
static void scsi_unjam_host(struct Scsi_Host *shost)
{
unsigned long flags;
}
/**
- * scsi_error_handler - Handle errors/timeouts of SCSI cmds.
+ * scsi_error_handler - SCSI error handler thread
* @data: Host for which we are running.
*
* Notes:
- * This is always run in the context of a kernel thread. The idea is
- * that we start this thing up when the kernel starts up (one per host
- * that we detect), and it immediately goes to sleep and waits for some
- * event (i.e. failure). When this takes place, we have the job of
- * trying to unjam the bus and restarting things.
- **/
+ * This is the main error handling loop. This is run as a kernel thread
+ * for every SCSI host and handles all error handling activity.
+ */
int scsi_error_handler(void *data)
{
- struct Scsi_Host *shost = (struct Scsi_Host *) data;
- int rtn;
- DECLARE_MUTEX_LOCKED(sem);
-
- current->flags |= PF_NOFREEZE;
- shost->eh_wait = &sem;
+ struct Scsi_Host *shost = data;
/*
- * Wake up the thread that created us.
+ * We use TASK_INTERRUPTIBLE so that the thread is not
+ * counted against the load average as a running process.
+ * We never actually get interrupted because kthread_run
+ * disables signal delivery for the created thread.
*/
- SCSI_LOG_ERROR_RECOVERY(3, printk("Wake up parent of"
- " scsi_eh_%d\n",shost->host_no));
-
- while (1) {
- /*
- * If we get a signal, it means we are supposed to go
- * away and die. This typically happens if the user is
- * trying to unload a module.
- */
- SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler"
- " scsi_eh_%d"
- " sleeping\n",shost->host_no));
-
- /*
- * Note - we always use down_interruptible with the semaphore
- * even if the module was loaded as part of the kernel. The
- * reason is that down() will cause this thread to be counted
- * in the load average as a running process, and down
- * interruptible doesn't. Given that we need to allow this
- * thread to die if the driver was loaded as a module, using
- * semaphores isn't unreasonable.
- */
- down_interruptible(&sem);
- if (kthread_should_stop())
- break;
-
- SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler"
- " scsi_eh_%d waking"
- " up\n",shost->host_no));
+ set_current_state(TASK_INTERRUPTIBLE);
+ while (!kthread_should_stop()) {
+ if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||
+ shost->host_failed != shost->host_busy) {
+ SCSI_LOG_ERROR_RECOVERY(1,
+ printk("Error handler scsi_eh_%d sleeping\n",
+ shost->host_no));
+ schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ continue;
+ }
- shost->eh_active = 1;
+ __set_current_state(TASK_RUNNING);
+ SCSI_LOG_ERROR_RECOVERY(1,
+ printk("Error handler scsi_eh_%d waking up\n",
+ shost->host_no));
/*
* We have a host that is failing for some reason. Figure out
* what we need to do to get it up and online again (if we can).
* If we fail, we end up taking the thing offline.
*/
- if (shost->hostt->eh_strategy_handler)
- rtn = shost->hostt->eh_strategy_handler(shost);
+ if (shost->transportt->eh_strategy_handler)
+ shost->transportt->eh_strategy_handler(shost);
else
scsi_unjam_host(shost);
- shost->eh_active = 0;
-
/*
* Note - if the above fails completely, the action is to take
* individual devices offline and flush the queue of any
* which are still online.
*/
scsi_restart_operations(shost);
-
+ set_current_state(TASK_INTERRUPTIBLE);
}
+ __set_current_state(TASK_RUNNING);
- SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler scsi_eh_%d"
- " exiting\n",shost->host_no));
-
- /*
- * Make sure that nobody tries to wake us up again.
- */
- shost->eh_wait = NULL;
+ SCSI_LOG_ERROR_RECOVERY(1,
+ printk("Error handler scsi_eh_%d exiting\n", shost->host_no));
+ shost->ehandler = NULL;
return 0;
}
struct scsi_device *sdev;
__shost_for_each_device(sdev, shost) {
- if (channel == sdev->channel) {
- sdev->was_reset = 1;
- sdev->expecting_cc_ua = 1;
- }
+ if (channel == sdev_channel(sdev))
+ __scsi_report_device_reset(sdev, NULL);
}
}
EXPORT_SYMBOL(scsi_report_bus_reset);
struct scsi_device *sdev;
__shost_for_each_device(sdev, shost) {
- if (channel == sdev->channel &&
- target == sdev->id) {
- sdev->was_reset = 1;
- sdev->expecting_cc_ua = 1;
- }
+ if (channel == sdev_channel(sdev) &&
+ target == sdev_id(sdev))
+ __scsi_report_device_reset(sdev, NULL);
}
}
EXPORT_SYMBOL(scsi_report_device_reset);
scsi_reset_provider(struct scsi_device *dev, int flag)
{
struct scsi_cmnd *scmd = scsi_get_command(dev, GFP_KERNEL);
+ struct Scsi_Host *shost = dev->host;
struct request req;
+ unsigned long flags;
int rtn;
+ blk_rq_init(NULL, &req);
scmd->request = &req;
- memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
- scmd->request->rq_status = RQ_SCSI_BUSY;
- memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
-
+ scmd->cmnd = req.cmd;
+
scmd->scsi_done = scsi_reset_provider_done_command;
- scmd->done = NULL;
- scmd->buffer = NULL;
- scmd->bufflen = 0;
- scmd->request_buffer = NULL;
- scmd->request_bufflen = 0;
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
scmd->cmd_len = 0;
scmd->sc_data_direction = DMA_BIDIRECTIONAL;
- scmd->sc_request = NULL;
- scmd->sc_magic = SCSI_CMND_MAGIC;
-
- init_timer(&scmd->eh_timeout);
- /*
- * Sometimes the command can get back into the timer chain,
- * so use the pid as an identifier.
- */
- scmd->pid = 0;
+ spin_lock_irqsave(shost->host_lock, flags);
+ shost->tmf_in_progress = 1;
+ spin_unlock_irqrestore(shost->host_lock, flags);
switch (flag) {
case SCSI_TRY_RESET_DEVICE:
if (rtn == SUCCESS)
break;
/* FALLTHROUGH */
+ case SCSI_TRY_RESET_TARGET:
+ rtn = scsi_try_target_reset(scmd);
+ if (rtn == SUCCESS)
+ break;
+ /* FALLTHROUGH */
case SCSI_TRY_RESET_BUS:
rtn = scsi_try_bus_reset(scmd);
if (rtn == SUCCESS)
rtn = FAILED;
}
+ spin_lock_irqsave(shost->host_lock, flags);
+ shost->tmf_in_progress = 0;
+ spin_unlock_irqrestore(shost->host_lock, flags);
+
+ /*
+ * be sure to wake up anyone who was sleeping or had their queue
+ * suspended while we performed the TMF.
+ */
+ SCSI_LOG_ERROR_RECOVERY(3,
+ printk("%s: waking up host to restart after TMF\n",
+ __func__));
+
+ wake_up(&shost->host_wait);
+
+ scsi_run_host_queues(shost);
+
scsi_next_command(scmd);
return rtn;
}
*
* Return value:
* 1 if valid sense data information found, else 0;
- **/
+ */
int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
struct scsi_sense_hdr *sshdr)
{
- if (!sense_buffer || !sb_len || (sense_buffer[0] & 0x70) != 0x70)
+ if (!sense_buffer || !sb_len)
return 0;
memset(sshdr, 0, sizeof(struct scsi_sense_hdr));
sshdr->response_code = (sense_buffer[0] & 0x7f);
+
+ if (!scsi_sense_valid(sshdr))
+ return 0;
+
if (sshdr->response_code >= 0x72) {
/*
* descriptor format
}
EXPORT_SYMBOL(scsi_normalize_sense);
-int scsi_request_normalize_sense(struct scsi_request *sreq,
- struct scsi_sense_hdr *sshdr)
-{
- return scsi_normalize_sense(sreq->sr_sense_buffer,
- sizeof(sreq->sr_sense_buffer), sshdr);
-}
-EXPORT_SYMBOL(scsi_request_normalize_sense);
-
int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
struct scsi_sense_hdr *sshdr)
{
return scsi_normalize_sense(cmd->sense_buffer,
- sizeof(cmd->sense_buffer), sshdr);
+ SCSI_SENSE_BUFFERSIZE, sshdr);
}
EXPORT_SYMBOL(scsi_command_normalize_sense);
/**
- * scsi_sense_desc_find - search for a given descriptor type in
- * descriptor sense data format.
- *
+ * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format.
* @sense_buffer: byte array of descriptor format sense data
* @sb_len: number of valid bytes in sense_buffer
* @desc_type: value of descriptor type to find
*
* Return value:
* pointer to start of (first) descriptor if found else NULL
- **/
+ */
const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
int desc_type)
{
EXPORT_SYMBOL(scsi_sense_desc_find);
/**
- * scsi_get_sense_info_fld - attempts to get information field from
- * sense data (either fixed or descriptor format)
- *
+ * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format)
* @sense_buffer: byte array of sense data
* @sb_len: number of valid bytes in sense_buffer
* @info_out: pointer to 64 integer where 8 or 4 byte information
*
* Return value:
* 1 if information field found, 0 if not found.
- **/
+ */
int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
u64 * info_out)
{
}
}
EXPORT_SYMBOL(scsi_get_sense_info_fld);
+
+/**
+ * scsi_build_sense_buffer - build sense data in a buffer
+ * @desc: Sense format (non zero == descriptor format,
+ * 0 == fixed format)
+ * @buf: Where to build sense data
+ * @key: Sense key
+ * @asc: Additional sense code
+ * @ascq: Additional sense code qualifier
+ *
+ **/
+void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq)
+{
+ if (desc) {
+ buf[0] = 0x72; /* descriptor, current */
+ buf[1] = key;
+ buf[2] = asc;
+ buf[3] = ascq;
+ buf[7] = 0;
+ } else {
+ buf[0] = 0x70; /* fixed, current */
+ buf[2] = key;
+ buf[7] = 0xa;
+ buf[12] = asc;
+ buf[13] = ascq;
+ }
+}
+EXPORT_SYMBOL(scsi_build_sense_buffer);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff