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nvme: set max_hw_wzeroes_unmap_sectors if device supports DEAC bit

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When the device supports the Write Zeroes command and the DEAC bit, it
indicates that the deallocate bit in the Write Zeroes command is
supported, and the bytes read from a deallocated logical block are
zeroes. This means the device supports unmap Write Zeroes operation, so
set the max_hw_wzeroes_unmap_sectors to max_write_zeroes_sectors on the
device's queue limit.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://lore.kernel.org/20250619111806.3546162-3-yi.zhang@huaweicloud.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Zhang Yi
2025-06-19 19:17:59 +08:00
committed by Christian Brauner
parent 0c40d7cb5e
commit 545fb46e5b
1 changed files with 11 additions and 9 deletions
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20
drivers/nvme/host/core.c
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@@ -2420,6 +2420,17 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
else
lim.write_stream_granularity = 0;
/*
* Only set the DEAC bit if the device guarantees that reads from
* deallocated data return zeroes. While the DEAC bit does not
* require that, it must be a no-op if reads from deallocated data
* do not return zeroes.
*/
if ((id->dlfeat & 0x7) == 0x1 && (id->dlfeat & (1 << 3))) {
ns->head->features |= NVME_NS_DEAC;
lim.max_hw_wzeroes_unmap_sectors = lim.max_write_zeroes_sectors;
}
ret = queue_limits_commit_update(ns->disk->queue, &lim);
if (ret) {
blk_mq_unfreeze_queue(ns->disk->queue, memflags);
@@ -2427,15 +2438,6 @@ static int nvme_update_ns_info_block(struct nvme_ns *ns,
}
set_capacity_and_notify(ns->disk, capacity);
/*
* Only set the DEAC bit if the device guarantees that reads from
* deallocated data return zeroes. While the DEAC bit does not
* require that, it must be a no-op if reads from deallocated data
* do not return zeroes.
*/
if ((id->dlfeat & 0x7) == 0x1 && (id->dlfeat & (1 << 3)))
ns->head->features |= NVME_NS_DEAC;
set_disk_ro(ns->disk, nvme_ns_is_readonly(ns, info));
set_bit(NVME_NS_READY, &ns->flags);
blk_mq_unfreeze_queue(ns->disk->queue, memflags);