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authorMing Lei <ming.lei@redhat.com>2021-01-22 10:33:11 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2021-03-04 17:36:59 -0500
commitd022d18c045fc2ccf92d0f14cf80f98eb0a8e119 (patch)
tree7088d1e6e3b1e9c37a75650be2c201be82f25277
parent2d13b1ea9f4affdaa7af0e0e4a1358d28f80c54f (diff)
scsi: blk-mq: Add callbacks for storing & retrieving budget token
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>
-rw-r--r--drivers/scsi/scsi_lib.c18
-rw-r--r--include/linux/blk-mq.h9
-rw-r--r--include/scsi/scsi_cmnd.h2
3 files changed, 29 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 7d52a11e1b61..02da34ab335d 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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)
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 2c473c9b8990..5fae401f083d 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -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.
*/
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index ace15b5dc956..0cf2b5ccc1f7 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -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