[PATCH v16 03/11] block: introduce max_write_streams queue limit

[Kanchan Joshi]

From: Keith Busch <kbusch at kernel.org>

Drivers with hardware that support write streams need a way to export how
many are available so applications can generically query this.

Reviewed-by: Hannes Reinecke <hare at suse.de>
Reviewed-by: Nitesh Shetty <nj.shetty at samsung.com>
Signed-off-by: Keith Busch <kbusch at kernel.org>
[hch: renamed hints to streams, removed stacking]
Signed-off-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Kanchan Joshi <joshi.k at samsung.com>
---
 Documentation/ABI/stable/sysfs-block | 7 +++++++
 block/blk-sysfs.c                    | 3 +++
 include/linux/blkdev.h               | 9 +++++++++
 3 files changed, 19 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block
index 11545c9e2e93..8bbe1eca28df 100644
--- a/Documentation/ABI/stable/sysfs-block
+++ b/Documentation/ABI/stable/sysfs-block
@@ -547,6 +547,13 @@ Description:
 		[RO] Maximum size in bytes of a single element in a DMA
 		scatter/gather list.
 
+What:		/sys/block/<disk>/queue/max_write_streams
+Date:		November 2024
+Contact:	linux-block at vger.kernel.org
+Description:
+		[RO] Maximum number of write streams supported, 0 if not
+		supported. If supported, valid values are 1 through
+		max_write_streams, inclusive.
 
 What:		/sys/block/<disk>/queue/max_segments
 Date:		March 2010
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 1f9b45b0b9ee..986cdba4f550 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -134,6 +134,7 @@ QUEUE_SYSFS_LIMIT_SHOW(max_segments)
 QUEUE_SYSFS_LIMIT_SHOW(max_discard_segments)
 QUEUE_SYSFS_LIMIT_SHOW(max_integrity_segments)
 QUEUE_SYSFS_LIMIT_SHOW(max_segment_size)
+QUEUE_SYSFS_LIMIT_SHOW(max_write_streams)
 QUEUE_SYSFS_LIMIT_SHOW(logical_block_size)
 QUEUE_SYSFS_LIMIT_SHOW(physical_block_size)
 QUEUE_SYSFS_LIMIT_SHOW(chunk_sectors)
@@ -488,6 +489,7 @@ QUEUE_LIM_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb");
 QUEUE_LIM_RO_ENTRY(queue_max_segments, "max_segments");
 QUEUE_LIM_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
 QUEUE_LIM_RO_ENTRY(queue_max_segment_size, "max_segment_size");
+QUEUE_LIM_RO_ENTRY(queue_max_write_streams, "max_write_streams");
 QUEUE_RW_ENTRY(elv_iosched, "scheduler");
 
 QUEUE_LIM_RO_ENTRY(queue_logical_block_size, "logical_block_size");
@@ -642,6 +644,7 @@ static struct attribute *queue_attrs[] = {
 	&queue_max_discard_segments_entry.attr,
 	&queue_max_integrity_segments_entry.attr,
 	&queue_max_segment_size_entry.attr,
+	&queue_max_write_streams_entry.attr,
 	&queue_hw_sector_size_entry.attr,
 	&queue_logical_block_size_entry.attr,
 	&queue_physical_block_size_entry.attr,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a9bd945e87b9..3747fbbd65fa 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -402,6 +402,8 @@ struct queue_limits {
 	unsigned short		max_integrity_segments;
 	unsigned short		max_discard_segments;
 
+	unsigned short		max_write_streams;
+
 	unsigned int		max_open_zones;
 	unsigned int		max_active_zones;
 
@@ -1285,6 +1287,13 @@ static inline unsigned int bdev_max_segments(struct block_device *bdev)
 	return queue_max_segments(bdev_get_queue(bdev));
 }
 
+static inline unsigned short bdev_max_write_streams(struct block_device *bdev)
+{
+	if (bdev_is_partition(bdev))
+		return 0;
+	return bdev_limits(bdev)->max_write_streams;
+}
+
 static inline unsigned queue_logical_block_size(const struct request_queue *q)
 {
 	return q->limits.logical_block_size;
-- 
2.25.1