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authorChaitanya Kulkarni <chaitanya.kulkarni@hgst.com>2016-11-30 12:29:01 -0800
committerJens Axboe <axboe@fb.com>2016-12-01 07:58:40 -0700
commit6d31e3ba232ea22458b2f36b6d3f2f9f11bf3fa4 (patch)
tree21b8454092fd386cfcf4a64e3af33895989d0a8d /drivers/nvme/host
parent3b7c33b28a44d4621e365e090bf8bd332ab232a1 (diff)
downloadlinux-6d31e3ba232ea22458b2f36b6d3f2f9f11bf3fa4.tar.bz2
nvme: add support for the Write Zeroes command
Allow write zeroes operations (REQ_OP_WRITE_ZEROES) on the block device, if the device supports optional command bit set for write zeroes. Add support to setup write zeroes command. Set maximum possible write zeroes sectors in one write zeroes command according to nvme write zeroes command definition. Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@hgst.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme/host')
-rw-r--r--drivers/nvme/host/core.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 8c644838252e..90c24e88bb38 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -272,6 +272,21 @@ static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
return BLK_MQ_RQ_QUEUE_OK;
}
+static inline void nvme_setup_write_zeroes(struct nvme_ns *ns,
+ struct request *req, struct nvme_command *cmnd)
+{
+ struct nvme_write_zeroes_cmd *write_zeroes = &cmnd->write_zeroes;
+
+ memset(cmnd, 0, sizeof(*cmnd));
+ write_zeroes->opcode = nvme_cmd_write_zeroes;
+ write_zeroes->nsid = cpu_to_le32(ns->ns_id);
+ write_zeroes->slba =
+ cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
+ write_zeroes->length =
+ cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
+ write_zeroes->control = 0;
+}
+
static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
struct nvme_command *cmnd)
{
@@ -325,6 +340,8 @@ int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
nvme_setup_flush(ns, cmd);
else if (req_op(req) == REQ_OP_DISCARD)
ret = nvme_setup_discard(ns, req, cmd);
+ else if (req_op(req) == REQ_OP_WRITE_ZEROES)
+ nvme_setup_write_zeroes(ns, req, cmd);
else
nvme_setup_rw(ns, req, cmd);
@@ -943,6 +960,10 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM)
nvme_config_discard(ns);
+ if (ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES)
+ blk_queue_max_write_zeroes_sectors(ns->queue,
+ ((u32)(USHRT_MAX + 1) * bs) >> 9);
+
blk_mq_unfreeze_queue(disk->queue);
}