diff options
author | Christoph Hellwig <hch@lst.de> | 2018-12-02 17:46:17 +0100 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2018-12-04 11:38:18 -0700 |
commit | 4e224106673f1e8679249a9cac75712b896861b0 (patch) | |
tree | 51620d993d8fa6945bbf740c8d0756a5736046c1 | |
parent | e20ba6e1da029136ded295f33076483d65ddf50a (diff) | |
download | linux-stable-4e224106673f1e8679249a9cac75712b896861b0.tar.gz linux-stable-4e224106673f1e8679249a9cac75712b896861b0.tar.bz2 linux-stable-4e224106673f1e8679249a9cac75712b896861b0.zip |
nvme-pci: use atomic bitops to mark a queue enabled
This gets rid of all the messing with cq_vector and the ->polled field
by using an atomic bitop to mark the queue enabled or not.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r-- | drivers/nvme/host/pci.c | 43 |
1 files changed, 15 insertions, 28 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index a1bb4bb92e7f..022395a319f4 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -201,7 +201,8 @@ struct nvme_queue { u16 last_cq_head; u16 qid; u8 cq_phase; - u8 polled; + unsigned long flags; +#define NVMEQ_ENABLED 0 u32 *dbbuf_sq_db; u32 *dbbuf_cq_db; u32 *dbbuf_sq_ei; @@ -927,7 +928,7 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, * We should not need to do this, but we're still using this to * ensure we can drain requests on a dying queue. */ - if (unlikely(nvmeq->cq_vector < 0 && !nvmeq->polled)) + if (unlikely(!test_bit(NVMEQ_ENABLED, &nvmeq->flags))) return BLK_STS_IOERR; ret = nvme_setup_cmd(ns, req, &cmnd); @@ -1395,31 +1396,19 @@ static void nvme_free_queues(struct nvme_dev *dev, int lowest) */ static int nvme_suspend_queue(struct nvme_queue *nvmeq) { - int vector; - - spin_lock_irq(&nvmeq->cq_lock); - if (nvmeq->cq_vector == -1 && !nvmeq->polled) { - spin_unlock_irq(&nvmeq->cq_lock); + if (!test_and_clear_bit(NVMEQ_ENABLED, &nvmeq->flags)) return 1; - } - vector = nvmeq->cq_vector; - nvmeq->dev->online_queues--; - nvmeq->cq_vector = -1; - nvmeq->polled = false; - spin_unlock_irq(&nvmeq->cq_lock); - /* - * Ensure that nvme_queue_rq() sees it ->cq_vector == -1 without - * having to grab the lock. - */ + /* ensure that nvme_queue_rq() sees NVMEQ_ENABLED cleared */ mb(); + nvmeq->dev->online_queues--; if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q); - - if (vector != -1) - pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq); - + if (nvmeq->cq_vector == -1) + return 0; + pci_free_irq(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector, nvmeq); + nvmeq->cq_vector = -1; return 0; } @@ -1578,13 +1567,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled) else if (result) goto release_cq; - /* - * Set cq_vector after alloc cq/sq, otherwise nvme_suspend_queue will - * invoke free_irq for it and cause a 'Trying to free already-free IRQ - * xxx' warning if the create CQ/SQ command times out. - */ nvmeq->cq_vector = vector; - nvmeq->polled = polled; nvme_init_queue(nvmeq, qid); if (vector != -1) { @@ -1593,11 +1576,11 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled) goto release_sq; } + set_bit(NVMEQ_ENABLED, &nvmeq->flags); return result; release_sq: nvmeq->cq_vector = -1; - nvmeq->polled = false; dev->online_queues--; adapter_delete_sq(dev, qid); release_cq: @@ -1751,6 +1734,7 @@ static int nvme_pci_configure_admin_queue(struct nvme_dev *dev) return result; } + set_bit(NVMEQ_ENABLED, &nvmeq->flags); return result; } @@ -2173,6 +2157,8 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) if (nr_io_queues == 0) return 0; + + clear_bit(NVMEQ_ENABLED, &adminq->flags); if (dev->cmb_use_sqes) { result = nvme_cmb_qdepth(dev, nr_io_queues, @@ -2227,6 +2213,7 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) adminq->cq_vector = -1; return result; } + set_bit(NVMEQ_ENABLED, &adminq->flags); return nvme_create_io_queues(dev); } |