linux-kernel - [PATCH 06/11] scsi: core: Add scsi_alloc_request

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Message-ID: <1647945585-197349-7-git-send-email-john.garry@huawei.com>
Date:   Tue, 22 Mar 2022 18:39:40 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <damien.lemoal@...nsource.wdc.com>,
        <bvanassche@....org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hch@....de>, <ming.lei@...hat.com>,
        <hare@...e.de>
CC:     <chenxiang66@...ilicon.com>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>, <dm-devel@...hat.com>,
        <beanhuo@...ron.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH 06/11] scsi: core: Add scsi_alloc_request_hwq()

Add a variant of scsi_alloc_request() which allocates a request for a
specific hw queue.

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

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index d230392f2b4a..543cc01b2816 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1137,6 +1137,18 @@ struct request *scsi_alloc_request(struct request_queue *q,
 }
 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 ad4bcace1390..94e65f4c81b5 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -399,4 +399,7 @@ extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
 struct request *scsi_alloc_request(struct request_queue *q,
 		unsigned int op, 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 */
-- 
2.26.2