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[RFC,v3,20/22] scsi: core: Add scsi_alloc_request_hwq()

Message ID 1666693096-180008-21-git-send-email-john.garry@huawei.com
State New
Headers show
Series blk-mq/libata/scsi: SCSI driver tagging improvements Part I | expand

Commit Message

John Garry Oct. 25, 2022, 10:18 a.m. UTC 
Add a variant of scsi_alloc_request() which allocates a request for a
specific hw queue.

Signed-off-by: John Garry <john.garry@huawei.com>
---
 drivers/scsi/scsi_lib.c  | 12 ++++++++++++
 include/scsi/scsi_cmnd.h |  3 +++
 2 files changed, 15 insertions(+)
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Patch

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 08015c42c326..a622be13bc48 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1143,6 +1143,18 @@  struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf,
 }
 EXPORT_SYMBOL_GPL(scsi_alloc_request);
 
+struct request *scsi_alloc_request_hwq(struct request_queue *q,
+		unsigned int op, blk_mq_req_flags_t flags, unsigned int hwq)
+{
+	struct request *rq;
+
+	rq = blk_mq_alloc_request_hctx(q, op, flags, hwq);
+	if (!IS_ERR(rq))
+		scsi_initialize_rq(rq);
+	return rq;
+}
+EXPORT_SYMBOL_GPL(scsi_alloc_request_hwq);
+
 /*
  * Only called when the request isn't completed by SCSI, and not freed by
  * SCSI
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 7d3622db38ed..1fd98d1e9c73 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -389,4 +389,7 @@  extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
 struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf,
 				   blk_mq_req_flags_t flags);
 
+struct request *scsi_alloc_request_hwq(struct request_queue *q,
+		unsigned int op, blk_mq_req_flags_t flags, unsigned int hwq);
+
 #endif /* _SCSI_SCSI_CMND_H */