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NVMe: Shutdown controller only for power-off 

We don't need to shutdown a controller for a reset. A controller in a
shutdown state may take longer to become ready than one that was simply
disabled. This patch has the driver shut down a controller only if the
device is about to be powered off or being removed. When taking the
controller down for a reset reason, the controller will be disabled
instead.

Function names have been updated in this patch to reflect their changed
semantics.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2016-01-12 14:41:18 -07:00 коммит произвёл Jens Axboe
Родитель db3cbfff5b
Коммит a5cdb68c2c
1 изменённых файлов: 19 добавлений и 21 удалений
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40
drivers/nvme/host/pci.c
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@ -87,7 +87,7 @@ struct nvme_queue;
static int nvme_reset(struct nvme_dev *dev);
static void nvme_process_cq(struct nvme_queue *nvmeq);
static void nvme_remove_dead_ctrl(struct nvme_dev *dev);
static void nvme_dev_shutdown(struct nvme_dev *dev);
static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown);
/*
* Represents an NVM Express device. Each nvme_dev is a PCI function.
@ -932,7 +932,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
dev_warn(dev->dev,
"I/O %d QID %d timeout, disable controller\n",
req->tag, nvmeq->qid);
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, false);
req->errors = NVME_SC_CANCELLED;
return BLK_EH_HANDLED;
}
@ -946,7 +946,7 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
dev_warn(dev->dev,
"I/O %d QID %d timeout, reset controller\n",
req->tag, nvmeq->qid);
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, false);
queue_work(nvme_workq, &dev->reset_work);
/*
@ -1065,21 +1065,20 @@ static void nvme_clear_queue(struct nvme_queue *nvmeq)
spin_unlock_irq(&nvmeq->q_lock);
}
static void nvme_disable_queue(struct nvme_dev *dev, int qid)
static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
{
struct nvme_queue *nvmeq = dev->queues[qid];
struct nvme_queue *nvmeq = dev->queues[0];
if (!nvmeq)
return;
if (nvme_suspend_queue(nvmeq))
return;
/* Don't tell the adapter to delete the admin queue.
* Don't tell a removed adapter to delete IO queues. */
if (qid && readl(dev->bar + NVME_REG_CSTS) != -1) {
adapter_delete_sq(dev, qid);
adapter_delete_cq(dev, qid);
}
if (shutdown)
nvme_shutdown_ctrl(&dev->ctrl);
else
nvme_disable_ctrl(&dev->ctrl, lo_hi_readq(
dev->bar + NVME_REG_CAP));
spin_lock_irq(&nvmeq->q_lock);
nvme_process_cq(nvmeq);
@ -1818,7 +1817,7 @@ static void nvme_dev_list_remove(struct nvme_dev *dev)
kthread_stop(tmp);
}
static void nvme_dev_shutdown(struct nvme_dev *dev)
static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown)
{
int i;
u32 csts = -1;
@ -1837,8 +1836,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
}
} else {
nvme_disable_io_queues(dev);
nvme_shutdown_ctrl(&dev->ctrl);
nvme_disable_queue(dev, 0);
nvme_disable_admin_queue(dev, shutdown);
}
nvme_dev_unmap(dev);
@ -1897,7 +1895,7 @@ static void nvme_reset_work(struct work_struct *work)
* moving on.
*/
if (dev->bar)
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, false);
set_bit(NVME_CTRL_RESETTING, &dev->flags);
@ -1951,7 +1949,7 @@ static void nvme_reset_work(struct work_struct *work)
dev->ctrl.admin_q = NULL;
dev->queues[0]->tags = NULL;
disable:
nvme_disable_queue(dev, 0);
nvme_disable_admin_queue(dev, false);
unmap:
nvme_dev_unmap(dev);
out:
@ -2086,7 +2084,7 @@ static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
struct nvme_dev *dev = pci_get_drvdata(pdev);
if (prepare)
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, false);
else
queue_work(nvme_workq, &dev->reset_work);
}
@ -2094,7 +2092,7 @@ static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
static void nvme_shutdown(struct pci_dev *pdev)
{
struct nvme_dev *dev = pci_get_drvdata(pdev);
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, true);
}
static void nvme_remove(struct pci_dev *pdev)
@ -2110,7 +2108,7 @@ static void nvme_remove(struct pci_dev *pdev)
flush_work(&dev->scan_work);
nvme_remove_namespaces(&dev->ctrl);
nvme_uninit_ctrl(&dev->ctrl);
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, true);
nvme_dev_remove_admin(dev);
nvme_free_queues(dev, 0);
nvme_release_cmb(dev);
@ -2124,7 +2122,7 @@ static int nvme_suspend(struct device *dev)
struct pci_dev *pdev = to_pci_dev(dev);
struct nvme_dev *ndev = pci_get_drvdata(pdev);
nvme_dev_shutdown(ndev);
nvme_dev_disable(ndev, true);
return 0;
}
@ -2155,7 +2153,7 @@ static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev,
case pci_channel_io_normal:
return PCI_ERS_RESULT_CAN_RECOVER;
case pci_channel_io_frozen:
nvme_dev_shutdown(dev);
nvme_dev_disable(dev, false);
return PCI_ERS_RESULT_NEED_RESET;
case pci_channel_io_perm_failure:
return PCI_ERS_RESULT_DISCONNECT;