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nvme-pci: don't poll from irq context when deleting queues
This is the last place outside of nvme_irq that handles CQEs from interrupt context, and thus is in the way of removing the cq_lock for normal queues, and avoiding lockdep warnings on the poll queues, for which we already take it without IRQ disabling. Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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5271edd41d
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@ -122,7 +122,6 @@ struct nvme_dev {
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u32 cmbsz;
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u32 cmbloc;
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struct nvme_ctrl ctrl;
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struct completion ioq_wait;
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mempool_t *iod_mempool;
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@ -203,10 +202,12 @@ struct nvme_queue {
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unsigned long flags;
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#define NVMEQ_ENABLED 0
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#define NVMEQ_SQ_CMB 1
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#define NVMEQ_DELETE_ERROR 2
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u32 *dbbuf_sq_db;
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u32 *dbbuf_cq_db;
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u32 *dbbuf_sq_ei;
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u32 *dbbuf_cq_ei;
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struct completion delete_done;
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};
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/*
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@ -1535,6 +1536,8 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled)
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int result;
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s16 vector;
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clear_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags);
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/*
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* A queue's vector matches the queue identifier unless the controller
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* has only one vector available.
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@ -2208,15 +2211,15 @@ static void nvme_del_queue_end(struct request *req, blk_status_t error)
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struct nvme_queue *nvmeq = req->end_io_data;
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blk_mq_free_request(req);
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complete(&nvmeq->dev->ioq_wait);
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complete(&nvmeq->delete_done);
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}
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static void nvme_del_cq_end(struct request *req, blk_status_t error)
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{
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struct nvme_queue *nvmeq = req->end_io_data;
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if (!error)
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nvme_poll_irqdisable(nvmeq, -1);
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if (error)
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set_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags);
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nvme_del_queue_end(req, error);
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}
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@ -2238,6 +2241,7 @@ static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
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req->timeout = ADMIN_TIMEOUT;
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req->end_io_data = nvmeq;
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init_completion(&nvmeq->delete_done);
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blk_execute_rq_nowait(q, NULL, req, false,
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opcode == nvme_admin_delete_cq ?
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nvme_del_cq_end : nvme_del_queue_end);
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@ -2249,7 +2253,6 @@ static bool nvme_disable_io_queues(struct nvme_dev *dev, u8 opcode)
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int nr_queues = dev->online_queues - 1, sent = 0;
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unsigned long timeout;
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reinit_completion(&dev->ioq_wait);
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retry:
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timeout = ADMIN_TIMEOUT;
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while (nr_queues > 0) {
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@ -2258,11 +2261,20 @@ static bool nvme_disable_io_queues(struct nvme_dev *dev, u8 opcode)
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nr_queues--;
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sent++;
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}
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while (sent--) {
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timeout = wait_for_completion_io_timeout(&dev->ioq_wait,
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while (sent) {
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struct nvme_queue *nvmeq = &dev->queues[nr_queues + sent];
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timeout = wait_for_completion_io_timeout(&nvmeq->delete_done,
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timeout);
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if (timeout == 0)
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return false;
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/* handle any remaining CQEs */
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if (opcode == nvme_admin_delete_cq &&
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!test_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags))
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nvme_poll_irqdisable(nvmeq, -1);
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sent--;
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if (nr_queues)
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goto retry;
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}
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@ -2746,7 +2758,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
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INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
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mutex_init(&dev->shutdown_lock);
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init_completion(&dev->ioq_wait);
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result = nvme_setup_prp_pools(dev);
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if (result)
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