#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
-#include <linux/scatterlist.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include "scsi_priv.h"
#include "scsi_logging.h"
+#include "scsi_transport_api.h"
#define SENSE_TIMEOUT (10*HZ)
* @shost: SCSI host to invoke error handling on.
*
* Schedule SCSI EH without scmd.
- **/
+ */
void scsi_schedule_eh(struct Scsi_Host *shost)
{
unsigned long flags;
*
* Return value:
* 0 on failure.
- **/
+ */
int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
{
struct Scsi_Host *shost = scmd->device->host;
* 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 *))
{
* 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;
* 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 scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
*
* 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;
* 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)
{
* 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_sense_hdr sshdr;
* 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)
{
/*
/**
* 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_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;
/**
* 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;
* 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;
* 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_send_eh_cmnd - submit a scsi command as part of error recory
+ * 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
- **/
-static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
- int cmnd_size, int timeout, int copy_sense)
+ * 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;
- 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) {
- sg_init_one(&sgl, scmd->sense_buffer,
- sizeof(scmd->sense_buffer));
-
+ ses->cmd_len = scmd->cmd_len;
+ memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
+ ses->data_direction = scmd->sc_data_direction;
+ ses->sdb = scmd->sdb;
+ ses->next_rq = scmd->request->next_rq;
+ ses->result = scmd->result;
+
+ 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->request_bufflen = sgl.length;
- scmd->request_buffer = &sgl;
- scmd->use_sg = 1;
+ scmd->sdb.table.nents = 1;
+ memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
+ scmd->cmnd[0] = REQUEST_SENSE;
+ scmd->cmnd[4] = scmd->sdb.length;
+ 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);
* 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));
+ 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_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->sdb = ses->sdb;
+ scmd->request->next_rq = ses->next_rq;
+ 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);
rtn = FAILED;
}
-
- /*
- * 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;
}
* 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};
-
- return scsi_send_eh_cmnd(scmd, generic_sense, 6, SENSE_TIMEOUT, 1);
+ 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.
- **/
+ */
void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
{
scmd->device->host->host_failed--;
/**
* 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.
- **/
+ */
int scsi_eh_get_sense(struct list_head *work_q,
struct list_head *done_q)
{
/**
* 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};
}
/**
- * 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)
{
/**
* 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};
/**
* 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)
/**
* 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)
* 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)
{
* 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) {
- 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) {
/*
* 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_allocate_request() fails for what ever reason, we
* completely forget to lock the door.
- **/
+ */
static void scsi_eh_lock_door(struct scsi_device *sdev)
{
unsigned char cmnd[MAX_COMMAND_SIZE];
* 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;
/**
* 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.
- *
- **/
+ * @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)
/**
* scsi_eh_flush_done_q - finish processed commands or retry them.
* @done_q: list_head of processed commands.
- *
- **/
+ */
void scsi_eh_flush_done_q(struct list_head *done_q)
{
struct scsi_cmnd *scmd, *next;
* 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;
* Notes:
* 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 = data;
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;
+ memset(&scmd->sdb, 0, sizeof(scmd->sdb));
scmd->cmd_len = 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);
*
* 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)
{
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)
{
projects / linux-2.6-omap-h63xx.git / blobdiff