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block: introduce max_write_streams queue limit 

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@suse.de>
Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
[hch: renamed hints to streams, removed stacking]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Link: https://lore.kernel.org/r/20250506121732.8211-4-joshi.k@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2025-05-06 17:47:24 +05:30 committed by Jens Axboe
parent 5006f85ea2
commit d2f526ba27
3 changed files with 19 additions and 0 deletions
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7
Documentation/ABI/stable/sysfs-block
View File

@ -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@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

3
block/blk-sysfs.c
View File

@ -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,

9
include/linux/blkdev.h
View File

@ -404,6 +404,8 @@ 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;
@ -1270,6 +1272,13 @@ 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;