}
/**
- * 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_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
+ * @copy_sense: request sense data if set to 1
+ *
+ * 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
**/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, int timeout)
+static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
+ int cmnd_size, int timeout, int copy_sense)
{
struct scsi_device *sdev = scmd->device;
struct Scsi_Host *shost = sdev->host;
- DECLARE_COMPLETION(done);
+ 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
+ * 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.
+ */
+ 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;
+
+ scmd->sc_data_direction = DMA_FROM_DEVICE;
+ scmd->request_bufflen = sgl.length;
+ scmd->request_buffer = &sgl;
+ scmd->use_sg = 1;
+ } else {
+ scmd->request_buffer = NULL;
+ scmd->request_bufflen = 0;
+ scmd->sc_data_direction = DMA_NONE;
+ scmd->use_sg = 0;
+ }
+
+ scmd->underflow = 0;
+ scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
+
if (sdev->scsi_level <= SCSI_2)
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
(sdev->lun << 5 & 0xe0);
+ /*
+ * 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));
+
shost->eh_action = &done;
spin_lock_irqsave(shost->host_lock, flags);
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;
return rtn;
}
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;
- }
+ {REQUEST_SENSE, 0, 0, 0, 252, 0};
- /*
- * 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, generic_sense, 6, SENSE_TIMEOUT, 1);
}
/**
{
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);
{
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);
+ rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_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;
-
- /*
- * 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) {
+
+ switch (rtn) {
+ case NEEDS_RETRY:
if (retry_cnt--)
goto retry_tur;
+ /*FALLTHRU*/
+ case SUCCESS:
return 0;
+ default:
+ return 1;
}
- return 1;
}
/**
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;
- rtn = scsi_send_eh_cmnd(scmd, START_UNIT_TIMEOUT);
+ if (scmd->device->allow_restart) {
+ int rtn;
- /*
- * 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, stu_command, 6,
+ START_UNIT_TIMEOUT, 0);
+ 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_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;
scmd->request = &req;
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;
*/
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:
rtn = scsi_try_bus_device_reset(scmd);
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",
+ __FUNCTION__));
+
+ wake_up(&shost->host_wait);
+
+ scsi_run_host_queues(shost);
+
scsi_next_command(scmd);
return rtn;
}
git.openpandora.org / pandora-kernel.git / blobdiff