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scsi: add new scsi-command flag for tagged commands

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Currently scsi piggy backs on the block layer to define the concept
of a tagged command.  But we want to be able to have block-level host-wide
tags assigned even for untagged commands like the initial INQUIRY, so add
a new SCSI-level flag for commands that are tagged at the scsi level, so
that even commands without that set can have tags assigned to them.  Note
that this alredy is the case for the blk-mq code path, and this just lets
the old path catch up with it.

We also set this flag based upon sdev->simple_tags instead of the block
queue flag, so that it is entirely independent of the block layer tagging,
and thus always correct even if a driver doesn't use block level tagging
yet.

Also remove the old blk_rq_tagged; it was only used by SCSI drivers, and
removing it forces them to look for the proper replacement.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig 2014-11-03 12:47:47 +01:00
parent a62182f338
commit 125c99bc8b
9 changed files with 22 additions and 20 deletions
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4
Documentation/block/biodoc.txt
View file

@ -827,10 +827,6 @@ but in the event of any barrier requests in the tag queue we need to ensure
that requests are restarted in the order they were queue. This may happen
if the driver needs to use blk_queue_invalidate_tags().
Tagging also defines a new request flag, REQ_QUEUED. This is set whenever
a request is currently tagged. You should not use this flag directly,
blk_rq_tagged(rq) is the portable way to do so.
3.3 I/O Submission
The routine submit_bio() is used to submit a single io. Higher level i/o

4
block/blk-core.c
View file

@ -1266,7 +1266,7 @@ void blk_requeue_request(struct request_queue *q, struct request *rq)
blk_clear_rq_complete(rq);
trace_block_rq_requeue(q, rq);
if (blk_rq_tagged(rq))
if (rq->cmd_flags & REQ_QUEUED)
blk_queue_end_tag(q, rq);
BUG_ON(blk_queued_rq(rq));
@ -2554,7 +2554,7 @@ EXPORT_SYMBOL_GPL(blk_unprep_request);
*/
void blk_finish_request(struct request *req, int error)
{
if (blk_rq_tagged(req))
if (req->cmd_flags & REQ_QUEUED)
blk_queue_end_tag(req->q, req);
BUG_ON(blk_queued_rq(req));

6
drivers/scsi/53c700.c
View file

@ -1767,7 +1767,7 @@ NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)
*/
if(NCR_700_get_depth(SCp->device) != 0
&& (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
|| !blk_rq_tagged(SCp->request))) {
|| !(SCp->flags & SCMD_TAGGED))) {
CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
NCR_700_get_depth(SCp->device));
return SCSI_MLQUEUE_DEVICE_BUSY;
@ -1795,7 +1795,7 @@ NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)
printk("53c700: scsi%d, command ", SCp->device->host->host_no);
scsi_print_command(SCp);
#endif
if(blk_rq_tagged(SCp->request)
if ((SCp->flags & SCMD_TAGGED)
&& (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
&& NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
@ -1809,7 +1809,7 @@ NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *)
*
* FIXME: This will royally screw up on multiple LUN devices
* */
if(!blk_rq_tagged(SCp->request)
if (!(SCp->flags & SCMD_TAGGED)
&& (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));

2
drivers/scsi/aic7xxx/aic7xxx_osm.c
View file

@ -1447,7 +1447,7 @@ ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
* we are storing a full busy target *lun*
* table in SCB space.
*/
if (!blk_rq_tagged(cmd->request)
if (!(cmd->flags & SCMD_TAGGED)
&& (ahc->features & AHC_SCB_BTT) == 0) {
int target_offset;

13
drivers/scsi/scsi_lib.c
View file

@ -1740,7 +1740,7 @@ static void scsi_request_fn(struct request_queue *q)
* we add the dev to the starved list so it eventually gets
* a run when a tag is freed.
*/
if (blk_queue_tagged(q) && !blk_rq_tagged(req)) {
if (blk_queue_tagged(q) && !(req->cmd_flags & REQ_QUEUED)) {
spin_lock_irq(shost->host_lock);
if (list_empty(&sdev->starved_entry))
list_add_tail(&sdev->starved_entry,
@ -1754,6 +1754,11 @@ static void scsi_request_fn(struct request_queue *q)
if (!scsi_host_queue_ready(q, shost, sdev))
goto host_not_ready;
if (sdev->simple_tags)
cmd->flags |= SCMD_TAGGED;
else
cmd->flags &= ~SCMD_TAGGED;
/*
* Finally, initialize any error handling parameters, and set up
@ -1908,10 +1913,10 @@ static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req,
blk_mq_start_request(req);
}
if (blk_queue_tagged(q))
req->cmd_flags |= REQ_QUEUED;
if (sdev->simple_tags)
cmd->flags |= SCMD_TAGGED;
else
req->cmd_flags &= ~REQ_QUEUED;
cmd->flags &= ~SCMD_TAGGED;
scsi_init_cmd_errh(cmd);
cmd->scsi_done = scsi_mq_done;

2
drivers/usb/storage/uas.c
View file

@ -181,7 +181,7 @@ static int uas_get_tag(struct scsi_cmnd *cmnd)
{
int tag;
if (blk_rq_tagged(cmnd->request))
if (cmnd->flags & SCMD_TAGGED)
tag = cmnd->request->tag + 2;
else
tag = 1;

1
include/linux/blkdev.h
View file

@ -1136,7 +1136,6 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk)
/*
* tag stuff
*/
#define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED)
extern int blk_queue_start_tag(struct request_queue *, struct request *);
extern struct request *blk_queue_find_tag(struct request_queue *, int);
extern void blk_queue_end_tag(struct request_queue *, struct request *);

4
include/scsi/scsi_cmnd.h
View file

@ -53,6 +53,9 @@ struct scsi_pointer {
volatile int phase;
};
/* for scmd->flags */
#define SCMD_TAGGED (1 << 0)
struct scsi_cmnd {
struct scsi_device *device;
struct list_head list; /* scsi_cmnd participates in queue lists */
@ -132,6 +135,7 @@ struct scsi_cmnd {
* to be at an address < 16Mb). */
int result; /* Status code from lower level driver */
int flags; /* Command flags */
unsigned char tag; /* SCSI-II queued command tag */
};

6
include/scsi/scsi_tcq.h
View file

@ -101,11 +101,9 @@ static inline void scsi_deactivate_tcq(struct scsi_device *sdev, int depth)
**/
static inline int scsi_populate_tag_msg(struct scsi_cmnd *cmd, char *msg)
{
struct request *req = cmd->request;
if (blk_rq_tagged(req)) {
if (cmd->flags & SCMD_TAGGED) {
*msg++ = MSG_SIMPLE_TAG;
*msg++ = req->tag;
*msg++ = cmd->request->tag;
return 2;
}