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nvme: fix Write Zeroes limitations

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We voluntarily limit the Write Zeroes sizes to the MDTS value provided by
the hardware, but currently get the units wrong, so fix that.

Fixes: 6e02318eae ("nvme: add support for the Write Zeroes command")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Tested-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-03-15 10:32:07 +01:00
parent 985c5a329d
commit b94e8cd2e6
1 changed files with 12 additions and 24 deletions
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36
drivers/nvme/host/core.c
View file

@ -1954,30 +1954,18 @@ static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
}
static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
/*
* Even though NVMe spec explicitly states that MDTS is not applicable to the
* write-zeroes, we are cautious and limit the size to the controllers
* max_hw_sectors value, which is based on the MDTS field and possibly other
* limiting factors.
*/
static void nvme_config_write_zeroes(struct request_queue *q,
struct nvme_ctrl *ctrl)
{
u64 max_blocks;
if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||
(ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
return;
/*
* Even though NVMe spec explicitly states that MDTS is not
* applicable to the write-zeroes:- "The restriction does not apply to
* commands that do not transfer data between the host and the
* controller (e.g., Write Uncorrectable ro Write Zeroes command).".
* In order to be more cautious use controller's max_hw_sectors value
* to configure the maximum sectors for the write-zeroes which is
* configured based on the controller's MDTS field in the
* nvme_init_identify() if available.
*/
if (ns->ctrl->max_hw_sectors == UINT_MAX)
max_blocks = (u64)USHRT_MAX + 1;
else
max_blocks = ns->ctrl->max_hw_sectors + 1;
blk_queue_max_write_zeroes_sectors(disk->queue,
nvme_lba_to_sect(ns, max_blocks));
if ((ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) &&
!(ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
blk_queue_max_write_zeroes_sectors(q, ctrl->max_hw_sectors);
}
static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids)
@ -2149,7 +2137,7 @@ static void nvme_update_disk_info(struct gendisk *disk,
set_capacity_and_notify(disk, capacity);
nvme_config_discard(disk, ns);
nvme_config_write_zeroes(disk, ns);
nvme_config_write_zeroes(disk->queue, ns->ctrl);
set_disk_ro(disk, (id->nsattr & NVME_NS_ATTR_RO) ||
test_bit(NVME_NS_FORCE_RO, &ns->flags));