#include <linux/sched.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 "scsi_priv.h"
#include "scsi_logging.h"
+#include "scsi_transport_api.h"
#define SENSE_TIMEOUT (10*HZ)
-#define START_UNIT_TIMEOUT (30*HZ)
/*
* These should *probably* be handled by the host itself.
**/
void scsi_times_out(struct scsi_cmnd *scmd)
{
+ enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+
scsi_log_completion(scmd, TIMEOUT_ERROR);
if (scmd->device->host->transportt->eh_timed_out)
- switch (scmd->device->host->transportt->eh_timed_out(scmd)) {
+ eh_timed_out = scmd->device->host->transportt->eh_timed_out;
+ else if (scmd->device->host->hostt->eh_timed_out)
+ eh_timed_out = scmd->device->host->hostt->eh_timed_out;
+ else
+ eh_timed_out = NULL;
+
+ if (eh_timed_out)
+ switch (eh_timed_out(scmd)) {
case EH_HANDLED:
__scsi_done(scmd);
return;
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:
}
/**
- * scsi_send_eh_cmnd - submit a scsi command as part of error recory
+ * 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",
+ __FUNCTION__));
+
+ 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",
+ __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_channel(scmd));
+ spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
+ }
+
+ return rtn;
+}
+
+/**
+ * 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;
+}
+
+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_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)
+{
+ /*
+ * 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_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
- * @cmnd: CDB to send
+ * @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
- * @timeout: timeout for this request
- * @copy_sense: request sense data if set to 1
+ * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
*
- * This function is used to send a scsi command down to a target device
- * as part of the error recovery process. If @copy_sense is 0 the command
- * sent must be one that does not transfer any data. If @copy_sense is 1
- * the command must be REQUEST_SENSE and this functions copies out the
- * sense buffer it got into @scmd->sense_buffer.
- *
- * Return value:
- * SUCCESS or FAILED or NEEDS_RETRY
+ * 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.
**/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
- int cmnd_size, int timeout, int copy_sense)
+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;
- int old_result = scmd->result;
- DECLARE_COMPLETION_ONSTACK(done);
- unsigned long timeleft;
- unsigned long flags;
- struct scatterlist sgl;
- unsigned char old_cmnd[MAX_COMMAND_SIZE];
- enum dma_data_direction old_data_direction;
- unsigned short old_use_sg;
- unsigned char old_cmd_len;
- unsigned old_bufflen;
- void *old_buffer;
- int rtn;
/*
* We need saved copies of a number of fields - this is because
* we will need to restore these values prior to running the actual
* command.
*/
- old_buffer = scmd->request_buffer;
- old_bufflen = scmd->request_bufflen;
- memcpy(old_cmnd, scmd->cmnd, sizeof(scmd->cmnd));
- old_data_direction = scmd->sc_data_direction;
- old_cmd_len = scmd->cmd_len;
- old_use_sg = scmd->use_sg;
-
- memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
- memcpy(scmd->cmnd, cmnd, cmnd_size);
-
- if (copy_sense) {
- gfp_t gfp_mask = GFP_ATOMIC;
-
- if (shost->hostt->unchecked_isa_dma)
- gfp_mask |= __GFP_DMA;
-
- sgl.page = alloc_page(gfp_mask);
- if (!sgl.page)
- return FAILED;
- sgl.offset = 0;
- sgl.length = 252;
-
+ ses->cmd_len = scmd->cmd_len;
+ memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
+ ses->data_direction = scmd->sc_data_direction;
+ ses->bufflen = scmd->request_bufflen;
+ ses->buffer = scmd->request_buffer;
+ ses->use_sg = scmd->use_sg;
+ ses->resid = scmd->resid;
+ ses->result = scmd->result;
+
+ if (sense_bytes) {
+ scmd->request_bufflen = min_t(unsigned,
+ sizeof(scmd->sense_buffer), sense_bytes);
+ sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
+ scmd->request_bufflen);
+ scmd->request_buffer = &ses->sense_sgl;
scmd->sc_data_direction = DMA_FROM_DEVICE;
- scmd->request_bufflen = sgl.length;
- scmd->request_buffer = &sgl;
scmd->use_sg = 1;
+ memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
+ scmd->cmnd[0] = REQUEST_SENSE;
+ scmd->cmnd[4] = scmd->request_bufflen;
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
} else {
scmd->request_buffer = NULL;
scmd->request_bufflen = 0;
scmd->sc_data_direction = DMA_NONE;
scmd->use_sg = 0;
+ if (cmnd) {
+ memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
+ memcpy(scmd->cmnd, cmnd, cmnd_size);
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+ }
}
scmd->underflow = 0;
- scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
- if (sdev->scsi_level <= SCSI_2)
+ if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN)
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
(sdev->lun << 5 & 0xe0);
* untransferred sense data should be interpreted as being zero.
*/
memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
+}
+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_prep_eh_cmnd
+ *
+ * Undo any damage done by above scsi_prep_eh_cmnd().
+ **/
+void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
+{
+ /*
+ * Restore original data
+ */
+ scmd->cmd_len = ses->cmd_len;
+ memcpy(scmd->cmnd, ses->cmnd, sizeof(scmd->cmnd));
+ scmd->sc_data_direction = ses->data_direction;
+ scmd->request_bufflen = ses->bufflen;
+ scmd->request_buffer = ses->buffer;
+ scmd->use_sg = ses->use_sg;
+ scmd->resid = ses->resid;
+ scmd->result = ses->result;
+}
+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);
break;
}
} else {
- /*
- * 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);
+ scsi_abort_eh_cmnd(scmd);
rtn = FAILED;
}
-
- /*
- * Last chance to have valid sense data.
- */
- if (copy_sense) {
- if (!SCSI_SENSE_VALID(scmd)) {
- memcpy(scmd->sense_buffer, scmd->request_buffer,
- sizeof(scmd->sense_buffer));
- }
- __free_page(sgl.page);
- }
-
-
- /*
- * Restore original data
- */
- scmd->request_buffer = old_buffer;
- scmd->request_bufflen = old_bufflen;
- memcpy(scmd->cmnd, old_cmnd, sizeof(scmd->cmnd));
- scmd->sc_data_direction = old_data_direction;
- scmd->cmd_len = old_cmd_len;
- scmd->use_sg = old_use_sg;
- scmd->result = old_result;
+ scsi_eh_restore_cmnd(scmd, &ses);
return rtn;
}
**/
static int scsi_request_sense(struct scsi_cmnd *scmd)
{
- static unsigned char generic_sense[6] =
- {REQUEST_SENSE, 0, 0, 0, 252, 0};
-
- return scsi_send_eh_cmnd(scmd, generic_sense, 6, SENSE_TIMEOUT, 1);
+ return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0);
}
/**
EXPORT_SYMBOL_GPL(scsi_eh_get_sense);
/**
- * 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);
-}
-
-/**
* scsi_eh_tur - Send TUR to device.
* @scmd: Scsi cmd to send TUR
*
}
/**
- * 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
*
static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
if (scmd->device->allow_restart) {
- int rtn;
+ int i, rtn = NEEDS_RETRY;
+
+ for (i = 0; rtn == NEEDS_RETRY && i < 2; i++)
+ rtn = scsi_send_eh_cmnd(scmd, stu_command, 6,
+ scmd->device->timeout, 0);
- rtn = scsi_send_eh_cmnd(scmd, stu_command, 6,
- START_UNIT_TIMEOUT, 0);
if (rtn == SUCCESS)
return 0;
}
}
/**
- * 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_channel(scmd));
- 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)
-{
- unsigned long flags;
- 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);
-
- 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_eh_bus_reset - send a bus reset
* @shost: scsi host being recovered.
* @eh_done_q: list_head for processed commands.
struct scsi_cmnd *scmd, *next;
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
- sdev_printk(KERN_INFO, scmd->device,
- "scsi: Device offlined - not"
- " ready after error recovery\n");
+ 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) {
/*
{
struct Scsi_Host *shost = data;
- current->flags |= PF_NOFREEZE;
-
/*
* We use TASK_INTERRUPTIBLE so that the thread is not
* counted against the load average as a running process.
memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
scmd->scsi_done = scsi_reset_provider_done_command;
- scmd->done = NULL;
scmd->request_buffer = NULL;
scmd->request_bufflen = 0;
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff