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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>
This commit is contained in:
Christoph Hellwig 2018-12-02 17:46:22 +01:00 committed by Jens Axboe
parent 5271edd41d
commit d1ed6aa14b
1 changed files with 19 additions and 8 deletions
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27
drivers/nvme/host/pci.c
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@ -122,7 +122,6 @@ struct nvme_dev {
u32 cmbsz;
u32 cmbloc;
struct nvme_ctrl ctrl;
struct completion ioq_wait;
mempool_t *iod_mempool;
@ -203,10 +202,12 @@ struct nvme_queue {
unsigned long flags;
#define NVMEQ_ENABLED 0
#define NVMEQ_SQ_CMB 1
#define NVMEQ_DELETE_ERROR 2
u32 *dbbuf_sq_db;
u32 *dbbuf_cq_db;
u32 *dbbuf_sq_ei;
u32 *dbbuf_cq_ei;
struct completion delete_done;
};
/*
@ -1535,6 +1536,8 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid, bool polled)
int result;
s16 vector;
clear_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags);
/*
* A queue's vector matches the queue identifier unless the controller
* has only one vector available.
@ -2208,15 +2211,15 @@ static void nvme_del_queue_end(struct request *req, blk_status_t error)
struct nvme_queue *nvmeq = req->end_io_data;
blk_mq_free_request(req);
complete(&nvmeq->dev->ioq_wait);
complete(&nvmeq->delete_done);
}
static void nvme_del_cq_end(struct request *req, blk_status_t error)
{
struct nvme_queue *nvmeq = req->end_io_data;
if (!error)
nvme_poll_irqdisable(nvmeq, -1);
if (error)
set_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags);
nvme_del_queue_end(req, error);
}
@ -2238,6 +2241,7 @@ static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
req->timeout = ADMIN_TIMEOUT;
req->end_io_data = nvmeq;
init_completion(&nvmeq->delete_done);
blk_execute_rq_nowait(q, NULL, req, false,
opcode == nvme_admin_delete_cq ?
nvme_del_cq_end : nvme_del_queue_end);
@ -2249,7 +2253,6 @@ static bool nvme_disable_io_queues(struct nvme_dev *dev, u8 opcode)
int nr_queues = dev->online_queues - 1, sent = 0;
unsigned long timeout;
reinit_completion(&dev->ioq_wait);
retry:
timeout = ADMIN_TIMEOUT;
while (nr_queues > 0) {
@ -2258,11 +2261,20 @@ static bool nvme_disable_io_queues(struct nvme_dev *dev, u8 opcode)
nr_queues--;
sent++;
}
while (sent--) {
timeout = wait_for_completion_io_timeout(&dev->ioq_wait,
while (sent) {
struct nvme_queue *nvmeq = &dev->queues[nr_queues + sent];
timeout = wait_for_completion_io_timeout(&nvmeq->delete_done,
timeout);
if (timeout == 0)
return false;
/* handle any remaining CQEs */
if (opcode == nvme_admin_delete_cq &&
!test_bit(NVMEQ_DELETE_ERROR, &nvmeq->flags))
nvme_poll_irqdisable(nvmeq, -1);
sent--;
if (nr_queues)
goto retry;
}
@ -2746,7 +2758,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
mutex_init(&dev->shutdown_lock);
init_completion(&dev->ioq_wait);
result = nvme_setup_prp_pools(dev);
if (result)