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Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block

Browse source 
Pull block IO poll support from Jens Axboe:
 "Various groups have been doing experimentation around IO polling for
  (really) fast devices.  The code has been reviewed and has been
  sitting on the side for a few releases, but this is now good enough
  for coordinated benchmarking and further experimentation.

  Currently O_DIRECT sync read/write are supported.  A framework is in
  the works that allows scalable stats tracking so we can auto-tune
  this.  And we'll add libaio support as well soon.  Fow now, it's an
  opt-in feature for test purposes"

* 'for-4.4/io-poll' of git://git.kernel.dk/linux-block:
  direct-io: be sure to assign dio->bio_bdev for both paths
  directio: add block polling support
  NVMe: add blk polling support
  block: add block polling support
  blk-mq: return tag/queue combo in the make_request_fn handlers
  block: change ->make_request_fn() and users to return a queue cookie
This commit is contained in:
Linus Torvalds 2015-11-10 17:23:49 -08:00
commit 3419b45039
33 changed files with 286 additions and 90 deletions
Download patch file Download diff file Expand all files Collapse all files

32
drivers/nvme/host/pci.c
View file

@ -90,7 +90,7 @@ static struct class *nvme_class;
static int __nvme_reset(struct nvme_dev *dev);
static int nvme_reset(struct nvme_dev *dev);
static int nvme_process_cq(struct nvme_queue *nvmeq);
static void nvme_process_cq(struct nvme_queue *nvmeq);
static void nvme_dead_ctrl(struct nvme_dev *dev);
struct async_cmd_info {
@ -935,7 +935,7 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
return BLK_MQ_RQ_QUEUE_BUSY;
}
static int nvme_process_cq(struct nvme_queue *nvmeq)
static void __nvme_process_cq(struct nvme_queue *nvmeq, unsigned int *tag)
{
u16 head, phase;
@ -953,6 +953,8 @@ static int nvme_process_cq(struct nvme_queue *nvmeq)
head = 0;
phase = !phase;
}
if (tag && *tag == cqe.command_id)
*tag = -1;
ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn);
fn(nvmeq, ctx, &cqe);
}
@ -964,14 +966,18 @@ static int nvme_process_cq(struct nvme_queue *nvmeq)
* a big problem.
*/
if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
return 0;
return;
writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
nvmeq->cq_head = head;
nvmeq->cq_phase = phase;
nvmeq->cqe_seen = 1;
return 1;
}
static void nvme_process_cq(struct nvme_queue *nvmeq)
{
__nvme_process_cq(nvmeq, NULL);
}
static irqreturn_t nvme_irq(int irq, void *data)
@ -995,6 +1001,23 @@ static irqreturn_t nvme_irq_check(int irq, void *data)
return IRQ_WAKE_THREAD;
}
static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
{
struct nvme_queue *nvmeq = hctx->driver_data;
if ((le16_to_cpu(nvmeq->cqes[nvmeq->cq_head].status) & 1) ==
nvmeq->cq_phase) {
spin_lock_irq(&nvmeq->q_lock);
__nvme_process_cq(nvmeq, &tag);
spin_unlock_irq(&nvmeq->q_lock);
if (tag == -1)
return 1;
}
return 0;
}
/*
* Returns 0 on success. If the result is negative, it's a Linux error code;
* if the result is positive, it's an NVM Express status code
@ -1656,6 +1679,7 @@ static struct blk_mq_ops nvme_mq_ops = {
.init_hctx = nvme_init_hctx,
.init_request = nvme_init_request,
.timeout = nvme_timeout,
.poll = nvme_poll,
};
static void nvme_dev_remove_admin(struct nvme_dev *dev)