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scsi: blk-mq: Add callbacks for storing & retrieving budget token

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Since SCSI is the only driver which requires dispatch budget move the token
from struct request to struct scsi_cmnd.

Link: https://lore.kernel.org/r/20210122023317.687987-8-ming.lei@redhat.com
Cc: Omar Sandoval <osandov@fb.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Tested-by: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lei 2021-01-22 10:33:11 +08:00 committed by Martin K. Petersen
parent 2d13b1ea9f
commit d022d18c04
3 changed files with 29 additions and 0 deletions
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18
drivers/scsi/scsi_lib.c
View File

@ -1642,6 +1642,20 @@ static bool scsi_mq_get_budget(struct request_queue *q)
return false;
}
static void scsi_mq_set_rq_budget_token(struct request *req, int token)
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
cmd->budget_token = token;
}
static int scsi_mq_get_rq_budget_token(struct request *req)
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
return cmd->budget_token;
}
static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@ -1856,6 +1870,8 @@ static const struct blk_mq_ops scsi_mq_ops_no_commit = {
.cleanup_rq = scsi_cleanup_rq,
.busy = scsi_mq_lld_busy,
.map_queues = scsi_map_queues,
.set_rq_budget_token = scsi_mq_set_rq_budget_token,
.get_rq_budget_token = scsi_mq_get_rq_budget_token,
};
@ -1884,6 +1900,8 @@ static const struct blk_mq_ops scsi_mq_ops = {
.cleanup_rq = scsi_cleanup_rq,
.busy = scsi_mq_lld_busy,
.map_queues = scsi_map_queues,
.set_rq_budget_token = scsi_mq_set_rq_budget_token,
.get_rq_budget_token = scsi_mq_get_rq_budget_token,
};
struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev)

9
include/linux/blk-mq.h
View File

@ -313,6 +313,15 @@ struct blk_mq_ops {
*/
void (*put_budget)(struct request_queue *);
/*
* @set_rq_budget_toekn: store rq's budget token
*/
void (*set_rq_budget_token)(struct request *, int);
/*
* @get_rq_budget_toekn: retrieve rq's budget token
*/
int (*get_rq_budget_token)(struct request *);
/**
* @timeout: Called on request timeout.
*/

2
include/scsi/scsi_cmnd.h
View File

@ -75,6 +75,8 @@ struct scsi_cmnd {
int eh_eflags; /* Used by error handlr */
int budget_token;
/*
* This is set to jiffies as it was when the command was first
* allocated. It is used to time how long the command has