From: Keith Busch Date: Tue, 6 May 2025 12:17:24 +0000 (+0530) Subject: block: introduce max_write_streams queue limit X-Git-Tag: for-6.16/block-20250523~66 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=d2f526ba27d29c442542f7c5df0a86ef0b576716;p=linux-block.git 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 Reviewed-by: Nitesh Shetty Signed-off-by: Keith Busch [hch: renamed hints to streams, removed stacking] Signed-off-by: Christoph Hellwig Signed-off-by: Kanchan Joshi Link: https://lore.kernel.org/r/20250506121732.8211-4-joshi.k@samsung.com Signed-off-by: Jens Axboe --- 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//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//queue/max_segments Date: March 2010 diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 01e0ead13278..5934150d4204 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 94323f303b37..13e1426ad38d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -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;