Allow write zeroes operations (REQ_OP_WRITE_ZEROES) on the queue
if device supports optinal command bit set for write zeroes.
Add support to setup write zeroes command.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulka...@hgst.com>
---
drivers/nvme/host/core.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 3fcd1f4..d1ebb2c 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 0;
}
+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)
+ queue_flag_set_unlocked(QUEUE_FLAG_WRITE_ZEROES, ns->queue);
+
blk_mq_unfreeze_queue(disk->queue);
}
--
1.8.3.1
--
To unsubscribe from this list: send the line "unsubscribe linux-block" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
