From 40d15b9aeb55a2fb140283a49e624d1aa481aa48 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Tue, 29 Oct 2024 08:19:20 -0700 Subject: [PATCH] block: export placement hint feature Add a feature flag for devices that support generic placement hints in write commands. This is in contrast to data lifetime hints. Signed-off-by: Keith Busch --- block/blk-settings.c | 2 ++ block/blk-sysfs.c | 3 +++ include/linux/blkdev.h | 3 +++ 3 files changed, 8 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index 230b7043fc86..11dde863d4da 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -518,6 +518,8 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, t->features &= ~BLK_FEAT_NOWAIT; if (!(b->features & BLK_FEAT_POLL)) t->features &= ~BLK_FEAT_POLL; + if (!(b->features & BLK_FEAT_PLACEMENT_HINTS)) + t->features &= ~BLK_FEAT_PLACEMENT_HINTS; t->flags |= (b->flags & BLK_FLAG_MISALIGNED); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 8d014161dde0..52dedda517ee 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -260,6 +260,7 @@ static ssize_t queue_##_name##_show(struct gendisk *disk, char *page) \ QUEUE_SYSFS_FEATURE_SHOW(poll, BLK_FEAT_POLL); QUEUE_SYSFS_FEATURE_SHOW(fua, BLK_FEAT_FUA); QUEUE_SYSFS_FEATURE_SHOW(dax, BLK_FEAT_DAX); +QUEUE_SYSFS_FEATURE_SHOW(placement_hints, BLK_FEAT_PLACEMENT_HINTS); static ssize_t queue_zoned_show(struct gendisk *disk, char *page) { @@ -468,6 +469,7 @@ QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay"); QUEUE_RW_ENTRY(queue_wc, "write_cache"); QUEUE_RO_ENTRY(queue_fua, "fua"); QUEUE_RO_ENTRY(queue_dax, "dax"); +QUEUE_RO_ENTRY(queue_placement_hints, "placement_hints"); QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout"); QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask"); QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment"); @@ -596,6 +598,7 @@ static struct attribute *queue_attrs[] = { &queue_wc_entry.attr, &queue_fua_entry.attr, &queue_dax_entry.attr, + &queue_placement_hints_entry.attr, &queue_poll_delay_entry.attr, &queue_virt_boundary_mask_entry.attr, &queue_dma_alignment_entry.attr, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 746b99b1a71d..06a6725eb5db 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -332,6 +332,9 @@ typedef unsigned int __bitwise blk_features_t; #define BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE \ ((__force blk_features_t)(1u << 15)) +/* supports generic write placement hints */ +#define BLK_FEAT_PLACEMENT_HINTS ((__force blk_features_t)(1u << 16)) + /* * Flags automatically inherited when stacking limits. */ -- 2.50.1