/*
* hp_sw_end_io - Completion handler for HP path activation.
* @req: path activation request
* @error: scsi-ml error
*
* Check sense data, free request structure, and notify dm that
* pg initialization has completed.
*
* Context: scsi-ml softirq
*
*/
static void hp_sw_end_io(struct request *req, int error)
{
struct dm_path *path = req->end_io_data;
unsigned err_flags = 0;
if (!error) {
DMDEBUG("%s path activation command - success",
path->dev->name);
goto out;
}
if (hp_sw_error_is_retryable(req)) {
DMDEBUG("%s path activation command - retry",
path->dev->name);
err_flags = MP_RETRY;
goto out;
}
DMWARN("%s path activation fail - error=0x%x",
path->dev->name, error);
err_flags = MP_FAIL_PATH;
out:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
dm_pg_init_complete(path, err_flags);
}
static void long_seq_test_free_end_io_fn(struct request *rq, int err)
{
struct test_request *test_rq;
struct test_data *ptd = test_get_test_data();
if (rq)
test_rq = (struct test_request *)rq->elv.priv[0];
else {
test_pr_err("%s: error: NULL request", __func__);
return;
}
BUG_ON(!test_rq);
spin_lock_irq(&ptd->lock);
ptd->dispatched_count--;
list_del_init(&test_rq->queuelist);
__blk_put_request(ptd->req_q, test_rq->rq);
spin_unlock_irq(&ptd->lock);
kfree(test_rq->bios_buffer);
kfree(test_rq);
utd->completed_req_count++;
test_pr_err("%s: request %d completed, err=%d",
__func__, test_rq->req_id, err);
check_test_completion();
}
static void blk_end_sync_rq(struct request *rq, int error)
{
struct completion *waiting = rq->end_io_data;
rq->end_io_data = NULL;
__blk_put_request(rq->q, rq);
complete(waiting);
}
/**
* blk_end_sync_rq - executes a completion event on a request
* @rq: request to complete
* @error: end I/O status of the request
*/
static void blk_end_sync_rq(struct request *rq, int error)
{
struct completion *waiting = rq->end_io_data;
rq->end_io_data = NULL;
__blk_put_request(rq->q, rq);
/*
* complete last, if this is a stack request the process (and thus
* the rq pointer) could be invalid right after this complete()
*/
complete(waiting);
}
/*
* Function: scsi_host_put_command()
*
* Purpose: Free a scsi command block
*
* Arguments: shost - scsi host
* cmd - command block to free
*
* Returns: Nothing.
*
* Notes: The command must not belong to any lists.
*/
void scsi_host_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
{
struct request_queue *q = shost->uspace_req_q;
struct request *rq = cmd->request;
struct scsi_tgt_cmd *tcmd = rq->end_io_data;
unsigned long flags;
kmem_cache_free(scsi_tgt_cmd_cache, tcmd);
spin_lock_irqsave(q->queue_lock, flags);
__blk_put_request(q, rq);
spin_unlock_irqrestore(q->queue_lock, flags);
__scsi_put_command(shost, cmd, &shost->shost_gendev);
}
/*
* alua_stpg - Evaluate SET TARGET GROUP STATES
* @sdev: the device to be evaluated
* @state: the new target group state
*
* Send a SET TARGET GROUP STATES command to the device.
* We only have to test here if we should resubmit the command;
* any other error is assumed as a failure.
*/
static void stpg_endio(struct request *req, int error)
{
struct alua_dh_data *h = req->end_io_data;
struct scsi_sense_hdr sense_hdr;
unsigned err = SCSI_DH_OK;
if (host_byte(req->errors) != DID_OK ||
msg_byte(req->errors) != COMMAND_COMPLETE) {
err = SCSI_DH_IO;
goto done;
}
if (req->sense_len > 0) {
err = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
&sense_hdr);
if (!err) {
err = SCSI_DH_IO;
goto done;
}
err = alua_check_sense(h->sdev, &sense_hdr);
if (err == ADD_TO_MLQUEUE) {
err = SCSI_DH_RETRY;
goto done;
}
sdev_printk(KERN_INFO, h->sdev,
"%s: stpg sense code: %02x/%02x/%02x\n",
ALUA_DH_NAME, sense_hdr.sense_key,
sense_hdr.asc, sense_hdr.ascq);
err = SCSI_DH_IO;
} else if (error)
err = SCSI_DH_IO;
if (err == SCSI_DH_OK) {
h->state = TPGS_STATE_OPTIMIZED;
sdev_printk(KERN_INFO, h->sdev,
"%s: port group %02x switched to state %c\n",
ALUA_DH_NAME, h->group_id,
print_alua_state(h->state));
}
done:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;
}
return;
}
/*
* stpg_endio - Evaluate SET TARGET GROUP STATES
* @sdev: the device to be evaluated
* @state: the new target group state
*
* Evaluate a SET TARGET GROUP STATES command response.
*/
static void stpg_endio(struct request *req, int error)
{
struct alua_dh_data *h = req->end_io_data;
struct scsi_sense_hdr sense_hdr;
unsigned err = SCSI_DH_OK;
if (host_byte(req->errors) != DID_OK ||
msg_byte(req->errors) != COMMAND_COMPLETE) {
err = SCSI_DH_IO;
goto done;
}
if (scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
&sense_hdr)) {
if (sense_hdr.sense_key == NOT_READY &&
sense_hdr.asc == 0x04 && sense_hdr.ascq == 0x0a) {
/* ALUA state transition already in progress */
err = SCSI_DH_OK;
goto done;
}
if (sense_hdr.sense_key == UNIT_ATTENTION) {
err = SCSI_DH_RETRY;
goto done;
}
sdev_printk(KERN_INFO, h->sdev, "%s: stpg failed\n",
ALUA_DH_NAME);
scsi_print_sense_hdr(h->sdev, ALUA_DH_NAME, &sense_hdr);
err = SCSI_DH_IO;
} else if (error)
err = SCSI_DH_IO;
if (err == SCSI_DH_OK) {
h->state = TPGS_STATE_OPTIMIZED;
sdev_printk(KERN_INFO, h->sdev,
"%s: port group %02x switched to state %c\n",
ALUA_DH_NAME, h->group_id,
print_alua_state(h->state));
}
done:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;
}
return;
}
/* Wakeup from interrupt */
static void osst_end_async(struct request *req, int update)
{
struct osst_request *SRpnt = req->end_io_data;
struct osst_tape *STp = SRpnt->stp;
struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data;
STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
#if DEBUG
STp->write_pending = 0;
#endif
if (SRpnt->waiting)
complete(SRpnt->waiting);
if (SRpnt->bio) {
kfree(mdata->pages);
blk_rq_unmap_user(SRpnt->bio);
}
__blk_put_request(req->q, req);
}
static void long_test_free_end_io_fn(struct request *rq, int err)
{
struct test_request *test_rq;
struct test_iosched *test_iosched = rq->q->elevator->elevator_data;
struct ufs_test_data *utd = test_iosched->blk_dev_test_data;
if (!rq) {
pr_err("%s: error: NULL request", __func__);
return;
}
test_rq = (struct test_request *)rq->elv.priv[0];
BUG_ON(!test_rq);
spin_lock_irq(&test_iosched->lock);
test_iosched->dispatched_count--;
list_del_init(&test_rq->queuelist);
__blk_put_request(test_iosched->req_q, test_rq->rq);
spin_unlock_irq(&test_iosched->lock);
if (utd->test_stage == UFS_TEST_LONG_SEQUENTIAL_MIXED_STAGE2 &&
rq_data_dir(rq) == READ &&
compare_buffer_to_pattern(test_rq)) {
/* if the pattern does not match */
pr_err("%s: read pattern not as expected", __func__);
utd->test_stage = UFS_TEST_ERROR;
check_test_completion(test_iosched);
return;
}
test_iosched_free_test_req_data_buffer(test_rq);
kfree(test_rq);
utd->completed_req_count++;
if (err)
pr_err("%s: request %d completed, err=%d", __func__,
test_rq->req_id, err);
check_test_completion(test_iosched);
}
static void start_stop_endio(struct request *req, int error)
{
struct hp_sw_dh_data *h = req->end_io_data;
unsigned err = SCSI_DH_OK;
if (error || host_byte(req->errors) != DID_OK ||
msg_byte(req->errors) != COMMAND_COMPLETE) {
sdev_printk(KERN_WARNING, h->sdev,
"%s: sending start_stop_unit failed with %x\n",
HP_SW_NAME, req->errors);
err = SCSI_DH_IO;
goto done;
}
if (req->sense_len > 0) {
err = start_done(h->sdev, h->sense);
if (err == SCSI_DH_RETRY) {
err = SCSI_DH_IO;
if (--h->retry_cnt) {
blk_put_request(req);
err = hp_sw_start_stop(h);
if (err == SCSI_DH_OK)
return;
}
}
}
done:
req->end_io_data = NULL;
__blk_put_request(req->q, req);
if (h->callback_fn) {
h->callback_fn(h->callback_data, err);
h->callback_fn = h->callback_data = NULL;
}
return;
}
static void scenario_free_end_io_fn(struct request *rq, int err)
{
struct test_request *test_rq;
struct test_data *ptd = test_get_test_data();
BUG_ON(!rq);
test_rq = (struct test_request *)rq->elv.priv[0];
BUG_ON(!test_rq);
spin_lock_irq(&ptd->lock);
ptd->dispatched_count--;
list_del_init(&test_rq->queuelist);
__blk_put_request(ptd->req_q, test_rq->rq);
spin_unlock_irq(&ptd->lock);
kfree(test_rq->bios_buffer);
kfree(test_rq);
if (err)
pr_err("%s: request %d completed, err=%d", __func__,
test_rq->req_id, err);
check_test_completion();
}
/*
* Called with the clone's queue lock held (in the case of .request_fn)
*/
static void end_clone_request(struct request *clone, int error)
{
struct dm_rq_target_io *tio = clone->end_io_data;
if (!clone->q->mq_ops) {
/*
* For just cleaning up the information of the queue in which
* the clone was dispatched.
* The clone is *NOT* freed actually here because it is alloced
* from dm own mempool (REQ_ALLOCED isn't set).
*/
__blk_put_request(clone->q, clone);
}
/*
* Actual request completion is done in a softirq context which doesn't
* hold the clone's queue lock. Otherwise, deadlock could occur because:
* - another request may be submitted by the upper level driver
* of the stacking during the completion
* - the submission which requires queue lock may be done
* against this clone's queue
*/
dm_complete_request(tio->orig, error);
}
/*
* Get block request for REQ_BLOCK_PC command issued to path. Currently
* limited to MODE_SELECT (trespass) and INQUIRY (VPD page 0xC0) commands.
*
* Uses data and sense buffers in hardware handler context structure and
* assumes serial servicing of commands, both issuance and completion.
*/
static struct request *get_req(struct scsi_device *sdev, int cmd)
{
struct clariion_dh_data *csdev = get_clariion_data(sdev);
struct request *rq;
unsigned char *page22;
int len = 0;
rq = blk_get_request(sdev->request_queue,
(cmd == MODE_SELECT) ? WRITE : READ, GFP_ATOMIC);
if (!rq) {
sdev_printk(KERN_INFO, sdev, "get_req: blk_get_request failed");
return NULL;
}
memset(&rq->cmd, 0, BLK_MAX_CDB);
rq->cmd[0] = cmd;
rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
switch (cmd) {
case MODE_SELECT:
if (csdev->short_trespass) {
page22 = csdev->hr ? short_trespass_hr : short_trespass;
len = sizeof(short_trespass);
} else {
page22 = csdev->hr ? long_trespass_hr : long_trespass;
len = sizeof(long_trespass);
}
/*
* Can't DMA from kernel BSS -- must copy selected trespass
* command mode page contents to context buffer which is
* allocated by kmalloc.
*/
BUG_ON((len > CLARIION_BUFFER_SIZE));
memcpy(csdev->buffer, page22, len);
rq->cmd_flags |= REQ_RW;
rq->cmd[1] = 0x10;
break;
case INQUIRY:
rq->cmd[1] = 0x1;
rq->cmd[2] = 0xC0;
len = CLARIION_BUFFER_SIZE;
memset(csdev->buffer, 0, CLARIION_BUFFER_SIZE);
break;
default:
BUG_ON(1);
break;
}
rq->cmd[4] = len;
rq->cmd_type = REQ_TYPE_BLOCK_PC;
rq->cmd_flags |= REQ_FAILFAST;
rq->timeout = CLARIION_TIMEOUT;
rq->retries = CLARIION_RETRIES;
rq->sense = csdev->sense;
memset(rq->sense, 0, SCSI_SENSE_BUFFERSIZE);
rq->sense_len = 0;
if (blk_rq_map_kern(sdev->request_queue, rq, csdev->buffer,
len, GFP_ATOMIC)) {
__blk_put_request(rq->q, rq);
return NULL;
}
return rq;
}
/*
* Has to be called with the request spinlock acquired
*/
static int attempt_merge(struct request_queue *q, struct request *req,
struct request *next)
{
if (!rq_mergeable(req) || !rq_mergeable(next))
return 0;
if (!blk_check_merge_flags(req->cmd_flags, next->cmd_flags))
return 0;
/*
* not contiguous
*/
if (blk_rq_pos(req) + blk_rq_sectors(req) != blk_rq_pos(next))
return 0;
if (rq_data_dir(req) != rq_data_dir(next)
|| req->rq_disk != next->rq_disk
|| req_no_special_merge(next))
return 0;
if (req->cmd_flags & REQ_WRITE_SAME &&
!blk_write_same_mergeable(req->bio, next->bio))
return 0;
/*
* If we are allowed to merge, then append bio list
* from next to rq and release next. merge_requests_fn
* will have updated segment counts, update sector
* counts here.
*/
if (!ll_merge_requests_fn(q, req, next))
return 0;
/*
* If failfast settings disagree or any of the two is already
* a mixed merge, mark both as mixed before proceeding. This
* makes sure that all involved bios have mixable attributes
* set properly.
*/
if ((req->cmd_flags | next->cmd_flags) & REQ_MIXED_MERGE ||
(req->cmd_flags & REQ_FAILFAST_MASK) !=
(next->cmd_flags & REQ_FAILFAST_MASK)) {
blk_rq_set_mixed_merge(req);
blk_rq_set_mixed_merge(next);
}
/*
* At this point we have either done a back merge
* or front merge. We need the smaller start_time of
* the merged requests to be the current request
* for accounting purposes.
*/
if (time_after(req->start_time, next->start_time))
req->start_time = next->start_time;
req->biotail->bi_next = next->bio;
req->biotail = next->biotail;
req->__data_len += blk_rq_bytes(next);
elv_merge_requests(q, req, next);
/*
* 'next' is going away, so update stats accordingly
*/
blk_account_io_merge(next);
req->ioprio = ioprio_best(req->ioprio, next->ioprio);
if (blk_rq_cpu_valid(next))
req->cpu = next->cpu;
/* owner-ship of bio passed from next to req */
next->bio = NULL;
__blk_put_request(q, next);
return 1;
}
