linux-kernel - [PATCH v5 3/7] block: introduce API to register stream information with block-layer

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Date:   Thu, 25 Apr 2019 16:49:58 +0530
From:   Kanchan Joshi <joshi.k@...sung.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Cc:     prakash.v@...sung.com, anshul@...sung.com,
        Kanchan Joshi <joshi.k@...sung.com>
Subject: [PATCH v5 3/7] block: introduce API to register stream information
 with block-layer

This introduces stream limit (count of streams supported by underlying
driver) in request-queue.

Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
---
 block/blk-settings.c   | 12 ++++++++++++
 include/linux/blkdev.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 6375afa..6023229 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -231,6 +231,18 @@ void blk_queue_max_discard_sectors(struct request_queue *q,
 EXPORT_SYMBOL(blk_queue_max_discard_sectors);
 
 /**
+ * blk_queue_stream_limits - set stream parameters
+ * @q:  the request queue for the device
+ * @nr_streams: number of streams supported by device
+ **/
+void blk_queue_stream_limits(struct request_queue *q,
+		unsigned short nr_streams)
+{
+	q->limits.nr_streams = nr_streams;
+}
+EXPORT_SYMBOL(blk_queue_stream_limits);
+
+/**
  * blk_queue_max_write_same_sectors - set max sectors for a single write same
  * @q:  the request queue for the device
  * @max_write_same_sectors: maximum number of sectors to write per command
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 2826225..5b6cb9747 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -340,6 +340,7 @@ struct queue_limits {
 	unsigned char		discard_misaligned;
 	unsigned char		raid_partial_stripes_expensive;
 	enum blk_zoned_model	zoned;
+	unsigned short		nr_streams;
 };
 
 #ifdef CONFIG_BLK_DEV_ZONED
@@ -1064,6 +1065,7 @@ extern void blk_queue_dma_alignment(struct request_queue *, int);
 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
+extern void blk_queue_stream_limits(struct request_queue *q, unsigned short);
 
 /*
  * Number of physical segments as sent to the device.
-- 
2.7.4