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authorJon Derrick <jonathan.derrick@intel.com>2015-07-20 10:14:08 -0600
committerJens Axboe <axboe@fb.com>2015-07-21 09:40:09 -0600
commit498c43949c7b8f57e0afb8195019cf5a7ba72de0 (patch)
treee8f8806ac007f39d9786584b94a04fb2e87ff332
parent0034af036554c39eefd14d835a8ec3496ac46712 (diff)
downloadop-kernel-dev-498c43949c7b8f57e0afb8195019cf5a7ba72de0.zip
op-kernel-dev-498c43949c7b8f57e0afb8195019cf5a7ba72de0.tar.gz
NVMe: Unify SQ entry writing and doorbell ringing
This patch changes sq_cmd writers to instead create their command on the stack. __nvme_submit_cmd copies the sq entry to the queue and writes the doorbell. Signed-off-by: Jon Derrick <jonathan.derrick@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
-rw-r--r--drivers/block/nvme-core.c80
1 files changed, 35 insertions, 45 deletions
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index d844ec4..e09ad6c 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -730,18 +730,16 @@ static int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
static void nvme_submit_priv(struct nvme_queue *nvmeq, struct request *req,
struct nvme_iod *iod)
{
- struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
+ struct nvme_command cmnd;
- memcpy(cmnd, req->cmd, sizeof(struct nvme_command));
- cmnd->rw.command_id = req->tag;
+ memcpy(&cmnd, req->cmd, sizeof(cmnd));
+ cmnd.rw.command_id = req->tag;
if (req->nr_phys_segments) {
- cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
- cmnd->rw.prp2 = cpu_to_le64(iod->first_dma);
+ cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
+ cmnd.rw.prp2 = cpu_to_le64(iod->first_dma);
}
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
+ __nvme_submit_cmd(nvmeq, &cmnd);
}
/*
@@ -754,45 +752,41 @@ static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
{
struct nvme_dsm_range *range =
(struct nvme_dsm_range *)iod_list(iod)[0];
- struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
+ struct nvme_command cmnd;
range->cattr = cpu_to_le32(0);
range->nlb = cpu_to_le32(blk_rq_bytes(req) >> 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.command_id = req->tag;
- cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
- cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma);
- cmnd->dsm.nr = 0;
- cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
+ memset(&cmnd, 0, sizeof(cmnd));
+ cmnd.dsm.opcode = nvme_cmd_dsm;
+ cmnd.dsm.command_id = req->tag;
+ cmnd.dsm.nsid = cpu_to_le32(ns->ns_id);
+ cmnd.dsm.prp1 = cpu_to_le64(iod->first_dma);
+ cmnd.dsm.nr = 0;
+ cmnd.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
+ __nvme_submit_cmd(nvmeq, &cmnd);
}
static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
int cmdid)
{
- struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
+ struct nvme_command cmnd;
- memset(cmnd, 0, sizeof(*cmnd));
- cmnd->common.opcode = nvme_cmd_flush;
- cmnd->common.command_id = cmdid;
- cmnd->common.nsid = cpu_to_le32(ns->ns_id);
+ memset(&cmnd, 0, sizeof(cmnd));
+ cmnd.common.opcode = nvme_cmd_flush;
+ cmnd.common.command_id = cmdid;
+ cmnd.common.nsid = cpu_to_le32(ns->ns_id);
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
+ __nvme_submit_cmd(nvmeq, &cmnd);
}
static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
struct nvme_ns *ns)
{
struct request *req = iod_get_private(iod);
- struct nvme_command *cmnd;
+ struct nvme_command cmnd;
u16 control = 0;
u32 dsmgmt = 0;
@@ -804,19 +798,17 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
if (req->cmd_flags & REQ_RAHEAD)
dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
- cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
- 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.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
- cmnd->rw.prp2 = cpu_to_le64(iod->first_dma);
- 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);
+ 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.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
+ cmnd.rw.prp2 = cpu_to_le64(iod->first_dma);
+ 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 (blk_integrity_rq(req)) {
- cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg));
+ cmnd.rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg));
switch (ns->pi_type) {
case NVME_NS_DPS_PI_TYPE3:
control |= NVME_RW_PRINFO_PRCHK_GUARD;
@@ -825,19 +817,17 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
case NVME_NS_DPS_PI_TYPE2:
control |= NVME_RW_PRINFO_PRCHK_GUARD |
NVME_RW_PRINFO_PRCHK_REF;
- cmnd->rw.reftag = cpu_to_le32(
+ cmnd.rw.reftag = cpu_to_le32(
nvme_block_nr(ns, blk_rq_pos(req)));
break;
}
} else if (ns->ms)
control |= NVME_RW_PRINFO_PRACT;
- cmnd->rw.control = cpu_to_le16(control);
- cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
+ cmnd.rw.control = cpu_to_le16(control);
+ cmnd.rw.dsmgmt = cpu_to_le32(dsmgmt);
- if (++nvmeq->sq_tail == nvmeq->q_depth)
- nvmeq->sq_tail = 0;
- writel(nvmeq->sq_tail, nvmeq->q_db);
+ __nvme_submit_cmd(nvmeq, &cmnd);
return 0;
}
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