diff options
| author | Keith Busch <kbusch@kernel.org> | 2020-04-03 09:24:01 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-05-09 16:18:34 -0600 |
| commit | 71fb90eb71d76089115aedf942533bcb3fd5c7f9 (patch) | |
| tree | a8e63f24789765ee0983d6e5c71f69922987a979 /drivers/nvme | |
| parent | 54840bed372c7779f23ece8514853fa83887b02e (diff) | |
nvme: provide num dword helper
Various nvme commands use a zeroes based number of dwords field. Create
a helper function to convert byte lengths to this format.
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/core.c | 4 | ||||
| -rw-r--r-- | drivers/nvme/host/nvme.h | 8 |
2 files changed, 10 insertions, 2 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index f3c037f5a9ba..6da941b6c67c 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -530,7 +530,7 @@ static int nvme_get_stream_params(struct nvme_ctrl *ctrl, c.directive.opcode = nvme_admin_directive_recv; c.directive.nsid = cpu_to_le32(nsid); - c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1); + c.directive.numd = cpu_to_le32(nvme_bytes_to_numd(sizeof(*s))); c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM; c.directive.dtype = NVME_DIR_STREAMS; @@ -2746,7 +2746,7 @@ int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, void *log, size_t size, u64 offset) { struct nvme_command c = { }; - unsigned long dwlen = size / 4 - 1; + u32 dwlen = nvme_bytes_to_numd(size); c.get_log_page.opcode = nvme_admin_get_log_page; c.get_log_page.nsid = cpu_to_le32(nsid); diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 2e04a36296d9..36f44b79bb3b 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -449,6 +449,14 @@ static inline sector_t nvme_lba_to_sect(struct nvme_ns *ns, u64 lba) return lba << (ns->lba_shift - SECTOR_SHIFT); } +/* + * Convert byte length to nvme's 0-based num dwords + */ +static inline u32 nvme_bytes_to_numd(size_t len) +{ + return (len >> 2) - 1; +} + static inline void nvme_end_request(struct request *req, __le16 status, union nvme_result result) { |