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authorJens Axboe <axboe@kernel.dk>2018-05-17 18:31:51 +0200
committerKeith Busch <keith.busch@intel.com>2018-05-18 14:41:36 -0600
commit1ab0cd6966fc4a7e9dfbd7c6eda917ae9c977f42 (patch)
tree76baa40276578d79e113b75f8f3d2bcb3bbe6640 /drivers/nvme
parent5cb525c8315f1dd9232b59cd1cf1e0f19ff1a5df (diff)
downloadlinux-1ab0cd6966fc4a7e9dfbd7c6eda917ae9c977f42.tar.bz2
nvme-pci: split the nvme queue lock into submission and completion locks
This is now feasible. We protect the submission queue ring with ->sq_lock, and the completion side with ->cq_lock. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/pci.c44
1 files changed, 23 insertions, 21 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 7fbb6f94b561..1b49b694a57a 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -147,9 +147,10 @@ static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl)
struct nvme_queue {
struct device *q_dmadev;
struct nvme_dev *dev;
- spinlock_t q_lock;
+ spinlock_t sq_lock;
struct nvme_command *sq_cmds;
struct nvme_command __iomem *sq_cmds_io;
+ spinlock_t cq_lock ____cacheline_aligned_in_smp;
volatile struct nvme_completion *cqes;
struct blk_mq_tags **tags;
dma_addr_t sq_dma_addr;
@@ -894,9 +895,9 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
blk_mq_start_request(req);
- spin_lock_irq(&nvmeq->q_lock);
+ spin_lock_irq(&nvmeq->sq_lock);
__nvme_submit_cmd(nvmeq, &cmnd);
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->sq_lock);
return BLK_STS_OK;
out_cleanup_iod:
nvme_free_iod(dev, req);
@@ -1000,9 +1001,9 @@ static irqreturn_t nvme_irq(int irq, void *data)
struct nvme_queue *nvmeq = data;
u16 start, end;
- spin_lock(&nvmeq->q_lock);
+ spin_lock(&nvmeq->cq_lock);
nvme_process_cq(nvmeq, &start, &end, -1);
- spin_unlock(&nvmeq->q_lock);
+ spin_unlock(&nvmeq->cq_lock);
if (start == end)
return IRQ_NONE;
@@ -1026,9 +1027,9 @@ static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag)
if (!nvme_cqe_pending(nvmeq))
return 0;
- spin_lock_irq(&nvmeq->q_lock);
+ spin_lock_irq(&nvmeq->cq_lock);
found = nvme_process_cq(nvmeq, &start, &end, tag);
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->cq_lock);
nvme_complete_cqes(nvmeq, start, end);
return found;
@@ -1051,9 +1052,9 @@ static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl)
c.common.opcode = nvme_admin_async_event;
c.common.command_id = NVME_AQ_BLK_MQ_DEPTH;
- spin_lock_irq(&nvmeq->q_lock);
+ spin_lock_irq(&nvmeq->sq_lock);
__nvme_submit_cmd(nvmeq, &c);
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->sq_lock);
}
static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
@@ -1310,15 +1311,15 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq)
{
int vector;
- spin_lock_irq(&nvmeq->q_lock);
+ spin_lock_irq(&nvmeq->cq_lock);
if (nvmeq->cq_vector == -1) {
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->cq_lock);
return 1;
}
vector = nvmeq->cq_vector;
nvmeq->dev->online_queues--;
nvmeq->cq_vector = -1;
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->cq_lock);
/*
* Ensure that nvme_queue_rq() sees it ->cq_vector == -1 without
@@ -1344,9 +1345,9 @@ static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
else
nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
- spin_lock_irq(&nvmeq->q_lock);
+ spin_lock_irq(&nvmeq->cq_lock);
nvme_process_cq(nvmeq, &start, &end, -1);
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->cq_lock);
nvme_complete_cqes(nvmeq, start, end);
}
@@ -1406,7 +1407,8 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth)
nvmeq->q_dmadev = dev->dev;
nvmeq->dev = dev;
- spin_lock_init(&nvmeq->q_lock);
+ spin_lock_init(&nvmeq->sq_lock);
+ spin_lock_init(&nvmeq->cq_lock);
nvmeq->cq_head = 0;
nvmeq->cq_phase = 1;
nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
@@ -1442,7 +1444,7 @@ static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
{
struct nvme_dev *dev = nvmeq->dev;
- spin_lock_irq(&nvmeq->q_lock);
+ spin_lock_irq(&nvmeq->cq_lock);
nvmeq->sq_tail = 0;
nvmeq->cq_head = 0;
nvmeq->cq_phase = 1;
@@ -1450,7 +1452,7 @@ static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
nvme_dbbuf_init(dev, nvmeq, qid);
dev->online_queues++;
- spin_unlock_irq(&nvmeq->q_lock);
+ spin_unlock_irq(&nvmeq->cq_lock);
}
static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
@@ -2001,14 +2003,14 @@ static void nvme_del_cq_end(struct request *req, blk_status_t error)
unsigned long flags;
/*
- * We might be called with the AQ q_lock held
- * and the I/O queue q_lock should always
+ * We might be called with the AQ cq_lock held
+ * and the I/O queue cq_lock should always
* nest inside the AQ one.
*/
- spin_lock_irqsave_nested(&nvmeq->q_lock, flags,
+ spin_lock_irqsave_nested(&nvmeq->cq_lock, flags,
SINGLE_DEPTH_NESTING);
nvme_process_cq(nvmeq, &start, &end, -1);
- spin_unlock_irqrestore(&nvmeq->q_lock, flags);
+ spin_unlock_irqrestore(&nvmeq->cq_lock, flags);
nvme_complete_cqes(nvmeq, start, end);
}