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Commit 2e1d8448 authored by Keith Busch's avatar Keith Busch
Browse files

NVMe: Asynchronous controller probe 



This performs the longest parts of nvme device probe in scheduled work.
This speeds up probe significantly when multiple devices are in use.

Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
parent b3fffdef

drivers/block/nvme-core.c

+31 −17
Original line number Diff line number Diff line
@@ -2800,6 +2800,10 @@ static int nvme_dev_open(struct inode *inode, struct file *f) 
	spin_lock(&dev_list_lock);

	list_for_each_entry(dev, &dev_list, node) {

		if (dev->instance == instance) {

			if (!dev->admin_q) {

				ret = -EWOULDBLOCK;

				break;

			}

			if (!kref_get_unless_zero(&dev->kref))

				break;

			f->private_data = dev;
@@ -2982,6 +2986,7 @@ static void nvme_reset_workfn(struct work_struct *work) 
	dev->reset_workfn(work);

}



static void nvme_async_probe(struct work_struct *work);

static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)

{

	int node, result = -ENOMEM;
@@ -3017,34 +3022,20 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
		goto release;



	kref_init(&dev->kref);

	result = nvme_dev_start(dev);

	if (result)

		goto release_pools;



	dev->device = device_create(nvme_class, &pdev->dev,

				MKDEV(nvme_char_major, dev->instance),

				dev, "nvme%d", dev->instance);

	if (IS_ERR(dev->device)) {

		result = PTR_ERR(dev->device);

		goto shutdown;

		goto release_pools;

	}

	get_device(dev->device);



	if (dev->online_queues > 1)

		result = nvme_dev_add(dev);

	if (result)

		goto device_del;



	nvme_set_irq_hints(dev);

	dev->initialized = 1;

	INIT_WORK(&dev->probe_work, nvme_async_probe);

	schedule_work(&dev->probe_work);

	return 0;



 device_del:

	device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance));

 shutdown:

	nvme_dev_shutdown(dev);

 release_pools:

	nvme_free_queues(dev, 0);

	nvme_release_prp_pools(dev);

 release:

	nvme_release_instance(dev);
@@ -3057,6 +3048,28 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) 
	return result;

}



static void nvme_async_probe(struct work_struct *work)

{

	struct nvme_dev *dev = container_of(work, struct nvme_dev, probe_work);

	int result;



	result = nvme_dev_start(dev);

	if (result)

		goto reset;



	if (dev->online_queues > 1)

		result = nvme_dev_add(dev);

	if (result)

		goto reset;



	nvme_set_irq_hints(dev);

	dev->initialized = 1;

	return;

 reset:

	dev->reset_workfn = nvme_reset_failed_dev;

	queue_work(nvme_workq, &dev->reset_work);

}



static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)

{

	struct nvme_dev *dev = pci_get_drvdata(pdev);
@@ -3082,6 +3095,7 @@ static void nvme_remove(struct pci_dev *pdev) 
	spin_unlock(&dev_list_lock);



	pci_set_drvdata(pdev, NULL);

	flush_work(&dev->probe_work);

	flush_work(&dev->reset_work);

	nvme_dev_shutdown(dev);

	nvme_dev_remove(dev);

include/linux/nvme.h

+1 −0
Original line number Diff line number Diff line
@@ -91,6 +91,7 @@ struct nvme_dev { 
	struct device *device;

	work_func_t reset_workfn;

	struct work_struct reset_work;

	struct work_struct probe_work;

	char name[12];

	char serial[20];

	char model[40];