[PATCH v2 4/4] nvme: add helper nvme_setup_cmd()
Ming Lin
mlin at kernel.org
Tue Mar 22 00:24:46 PDT 2016
From: Ming Lin <ming.l at ssi.samsung.com>
This moves nvme_setup_{flush,discard,rw} calls into a common
nvme_setup_cmd() helper. So we can eventually hide all the command
setup in the core module and don't even need to update the fabrics
drivers for any specific command type.
Signed-off-by: Ming Lin <ming.l at ssi.samsung.com>
---
drivers/nvme/host/core.c | 105 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/nvme/host/nvme.h | 53 +-----------------------
drivers/nvme/host/pci.c | 47 +--------------------
3 files changed, 108 insertions(+), 97 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index ff9cf2b..dfb5b6e 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -127,6 +127,111 @@ struct request *nvme_alloc_request(struct request_queue *q,
return req;
}
+static inline void nvme_setup_flush(struct nvme_ns *ns,
+ struct nvme_command *cmnd)
+{
+ memset(cmnd, 0, sizeof(*cmnd));
+ cmnd->common.opcode = nvme_cmd_flush;
+ cmnd->common.nsid = cpu_to_le32(ns->ns_id);
+}
+
+static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmnd)
+{
+ struct nvme_dsm_range *range;
+ struct page *page;
+ int offset;
+ unsigned int nr_bytes = blk_rq_bytes(req);
+
+ range = kmalloc(sizeof(*range), GFP_ATOMIC);
+ if (!range)
+ return BLK_MQ_RQ_QUEUE_BUSY;
+
+ range->cattr = cpu_to_le32(0);
+ range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
+ range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
+
+ memset(cmnd, 0, sizeof(*cmnd));
+ cmnd->dsm.opcode = nvme_cmd_dsm;
+ cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->dsm.nr = 0;
+ cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
+
+ req->completion_data = range;
+ page = virt_to_page(range);
+ offset = offset_in_page(range);
+ blk_add_request_payload(req, page, offset, sizeof(*range));
+
+ /*
+ * we set __data_len back to the size of the area to be discarded
+ * on disk. This allows us to report completion on the full amount
+ * of blocks described by the request.
+ */
+ req->__data_len = nr_bytes;
+
+ return 0;
+}
+
+static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmnd)
+{
+ u16 control = 0;
+ u32 dsmgmt = 0;
+
+ if (req->cmd_flags & REQ_FUA)
+ control |= NVME_RW_FUA;
+ if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
+ control |= NVME_RW_LR;
+
+ if (req->cmd_flags & REQ_RAHEAD)
+ dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
+
+ memset(cmnd, 0, sizeof(*cmnd));
+ cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
+ cmnd->rw.command_id = req->tag;
+ cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
+ cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
+
+ if (ns->ms) {
+ switch (ns->pi_type) {
+ case NVME_NS_DPS_PI_TYPE3:
+ control |= NVME_RW_PRINFO_PRCHK_GUARD;
+ break;
+ case NVME_NS_DPS_PI_TYPE1:
+ case NVME_NS_DPS_PI_TYPE2:
+ control |= NVME_RW_PRINFO_PRCHK_GUARD |
+ NVME_RW_PRINFO_PRCHK_REF;
+ cmnd->rw.reftag = cpu_to_le32(
+ nvme_block_nr(ns, blk_rq_pos(req)));
+ break;
+ }
+ if (!blk_integrity_rq(req))
+ control |= NVME_RW_PRINFO_PRACT;
+ }
+
+ cmnd->rw.control = cpu_to_le16(control);
+ cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
+}
+
+int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmd)
+{
+ int ret = 0;
+
+ if (req->cmd_type == REQ_TYPE_DRV_PRIV)
+ memcpy(cmd, req->cmd, sizeof(*cmd));
+ else if (req->cmd_flags & REQ_FLUSH)
+ nvme_setup_flush(ns, cmd);
+ else if (req->cmd_flags & REQ_DISCARD)
+ ret = nvme_setup_discard(ns, req, cmd);
+ else
+ nvme_setup_rw(ns, req, cmd);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_setup_cmd);
+
/*
* Returns 0 on success. If the result is negative, it's a Linux error code;
* if the result is positive, it's an NVM Express status code
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 331d437..5eae43d 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -189,57 +189,6 @@ static inline unsigned nvme_map_len(struct request *rq)
return blk_rq_bytes(rq);
}
-static inline void nvme_setup_flush(struct nvme_ns *ns,
- struct nvme_command *cmnd)
-{
- memset(cmnd, 0, sizeof(*cmnd));
- cmnd->common.opcode = nvme_cmd_flush;
- cmnd->common.nsid = cpu_to_le32(ns->ns_id);
-}
-
-static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
- struct nvme_command *cmnd)
-{
- u16 control = 0;
- u32 dsmgmt = 0;
-
- if (req->cmd_flags & REQ_FUA)
- control |= NVME_RW_FUA;
- if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
- control |= NVME_RW_LR;
-
- if (req->cmd_flags & REQ_RAHEAD)
- dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
-
- memset(cmnd, 0, sizeof(*cmnd));
- cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
- cmnd->rw.command_id = req->tag;
- cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
- cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
- cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
-
- if (ns->ms) {
- switch (ns->pi_type) {
- case NVME_NS_DPS_PI_TYPE3:
- control |= NVME_RW_PRINFO_PRCHK_GUARD;
- break;
- case NVME_NS_DPS_PI_TYPE1:
- case NVME_NS_DPS_PI_TYPE2:
- control |= NVME_RW_PRINFO_PRCHK_GUARD |
- NVME_RW_PRINFO_PRCHK_REF;
- cmnd->rw.reftag = cpu_to_le32(
- nvme_block_nr(ns, blk_rq_pos(req)));
- break;
- }
- if (!blk_integrity_rq(req))
- control |= NVME_RW_PRINFO_PRACT;
- }
-
- cmnd->rw.control = cpu_to_le16(control);
- cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
-}
-
-
static inline int nvme_error_status(u16 status)
{
switch (status & 0x7ff) {
@@ -278,6 +227,8 @@ void nvme_kill_queues(struct nvme_ctrl *ctrl);
struct request *nvme_alloc_request(struct request_queue *q,
struct nvme_command *cmd, unsigned int flags, int qid);
void nvme_requeue_req(struct request *req);
+int nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmd);
int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
void *buf, unsigned bufflen);
int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index f2f8a4d..082c3d1 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -607,43 +607,6 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
nvme_free_iod(dev, req);
}
-static inline int nvme_setup_discard(struct nvme_ns *ns, struct request *req,
- struct nvme_command *cmnd)
-{
- struct nvme_dsm_range *range;
- struct page *page;
- int offset;
- unsigned int nr_bytes = blk_rq_bytes(req);
-
- range = kmalloc(sizeof(*range), GFP_ATOMIC);
- if (!range)
- return BLK_MQ_RQ_QUEUE_BUSY;
-
- range->cattr = cpu_to_le32(0);
- range->nlb = cpu_to_le32(nr_bytes >> ns->lba_shift);
- range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
-
- memset(cmnd, 0, sizeof(*cmnd));
- cmnd->dsm.opcode = nvme_cmd_dsm;
- cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
- cmnd->dsm.nr = 0;
- cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
-
- req->completion_data = range;
- page = virt_to_page(range);
- offset = offset_in_page(range);
- blk_add_request_payload(req, page, offset, sizeof(*range));
-
- /*
- * we set __data_len back to the size of the area to be discarded
- * on disk. This allows us to report completion on the full amount
- * of blocks described by the request.
- */
- req->__data_len = nr_bytes;
-
- return 0;
-}
-
/*
* NOTE: ns is NULL when called on the admin queue.
*/
@@ -676,15 +639,7 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
if (ret)
return ret;
- if (req->cmd_type == REQ_TYPE_DRV_PRIV)
- memcpy(&cmnd, req->cmd, sizeof(cmnd));
- else if (req->cmd_flags & REQ_FLUSH)
- nvme_setup_flush(ns, &cmnd);
- else if (req->cmd_flags & REQ_DISCARD)
- ret = nvme_setup_discard(ns, req, &cmnd);
- else
- nvme_setup_rw(ns, req, &cmnd);
-
+ ret = nvme_setup_cmd(ns, req, &cmnd);
if (ret)
goto out;
--
1.9.1
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