diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/nvme/host/pci.c | 75 |
1 files changed, 40 insertions, 35 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 6a32a92a9227..0497ff67324c 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -48,6 +48,13 @@ #define NVME_AQ_DEPTH 256 #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) + +/* + * We handle AEN commands ourselves and don't even let the + * block layer know about them. + */ +#define NVME_NR_AEN_COMMANDS 1 +#define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AEN_COMMANDS) unsigned char admin_timeout = 60; module_param(admin_timeout, byte, 0644); @@ -355,23 +362,23 @@ static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn) return ctx; } -static void async_req_completion(struct nvme_queue *nvmeq, void *ctx, - struct nvme_completion *cqe) +static void nvme_complete_async_event(struct nvme_dev *dev, + struct nvme_completion *cqe) { - u32 result = le32_to_cpup(&cqe->result); - u16 status = le16_to_cpup(&cqe->status) >> 1; + u16 status = le16_to_cpu(cqe->status) >> 1; + u32 result = le32_to_cpu(cqe->result); if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ) - ++nvmeq->dev->ctrl.event_limit; + ++dev->ctrl.event_limit; if (status != NVME_SC_SUCCESS) return; switch (result & 0xff07) { case NVME_AER_NOTICE_NS_CHANGED: - dev_info(nvmeq->q_dmadev, "rescanning\n"); - queue_work(nvme_workq, &nvmeq->dev->scan_work); + dev_info(dev->dev, "rescanning\n"); + queue_work(nvme_workq, &dev->scan_work); default: - dev_warn(nvmeq->q_dmadev, "async event result %08x\n", result); + dev_warn(dev->dev, "async event result %08x\n", result); } } @@ -404,7 +411,7 @@ static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag, } /** - * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell + * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell * @nvmeq: The queue to use * @cmd: The command to send * @@ -853,15 +860,31 @@ static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag) void *ctx; nvme_completion_fn fn; struct nvme_completion cqe = nvmeq->cqes[head]; - if ((le16_to_cpu(cqe.status) & 1) != phase) + u16 status = le16_to_cpu(cqe.status); + + if ((status & 1) != phase) break; nvmeq->sq_head = le16_to_cpu(cqe.sq_head); if (++head == nvmeq->q_depth) { head = 0; phase = !phase; } + if (tag && *tag == cqe.command_id) *tag = -1; + + /* + * AEN requests are special as they don't time out and can + * survive any kind of queue freeze and often don't respond to + * aborts. We don't even bother to allocate a struct request + * for them but rather special case them here. + */ + if (unlikely(nvmeq->qid == 0 && + cqe.command_id >= NVME_AQ_BLKMQ_DEPTH)) { + nvme_complete_async_event(nvmeq->dev, &cqe); + continue; + } + ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn); fn(nvmeq, ctx, &cqe); } @@ -926,29 +949,15 @@ static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) return 0; } -static int nvme_submit_async_admin_req(struct nvme_dev *dev) +static void nvme_submit_async_event(struct nvme_dev *dev) { - struct nvme_queue *nvmeq = dev->queues[0]; struct nvme_command c; - struct nvme_cmd_info *cmd_info; - struct request *req; - - req = blk_mq_alloc_request(dev->ctrl.admin_q, WRITE, - BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_RESERVED); - if (IS_ERR(req)) - return PTR_ERR(req); - - req->cmd_flags |= REQ_NO_TIMEOUT; - cmd_info = blk_mq_rq_to_pdu(req); - nvme_set_info(cmd_info, NULL, async_req_completion); memset(&c, 0, sizeof(c)); c.common.opcode = nvme_admin_async_event; - c.common.command_id = req->tag; + c.common.command_id = NVME_AQ_BLKMQ_DEPTH + --dev->ctrl.event_limit; - blk_mq_free_request(req); - __nvme_submit_cmd(nvmeq, &c); - return 0; + __nvme_submit_cmd(dev->queues[0], &c); } static void async_cmd_info_endio(struct request *req, int error) @@ -1387,8 +1396,7 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) if (!dev->ctrl.admin_q) { dev->admin_tagset.ops = &nvme_mq_admin_ops; dev->admin_tagset.nr_hw_queues = 1; - dev->admin_tagset.queue_depth = NVME_AQ_DEPTH; - dev->admin_tagset.reserved_tags = 1; + dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH; dev->admin_tagset.timeout = ADMIN_TIMEOUT; dev->admin_tagset.numa_node = dev_to_node(dev->dev); dev->admin_tagset.cmd_size = nvme_cmd_size(dev); @@ -1496,11 +1504,8 @@ static int nvme_kthread(void *data) spin_lock_irq(&nvmeq->q_lock); nvme_process_cq(nvmeq); - while (i == 0 && dev->ctrl.event_limit > 0) { - if (nvme_submit_async_admin_req(dev)) - break; - dev->ctrl.event_limit--; - } + while (i == 0 && dev->ctrl.event_limit > 0) + nvme_submit_async_event(dev); spin_unlock_irq(&nvmeq->q_lock); } } @@ -2151,7 +2156,7 @@ static void nvme_reset_work(struct work_struct *work) if (result) goto free_tags; - dev->ctrl.event_limit = 1; + dev->ctrl.event_limit = NVME_NR_AEN_COMMANDS; result = nvme_dev_list_add(dev); if (result) |