NVMe: add sysfs and ioctl controller reset
We need the ability to perform an nvme controller reset as discussed on
the mailing list thread:
http://lists.infradead.org/pipermail/linux-nvme/2015-March/001585.html
This adds a sysfs entry that when written to will reset perform an NVMe
controller reset if the controller was successfully initialized in the
first place.
This also adds locking around resetting the device in the async probe
method so the driver can't schedule two resets.
Signed-off-by: Keith Busch <keith.busch@intel.com>
Cc: Brandon Schultz <brandon.schulz@hgst.com>
Cc: David Sariel <david.sariel@pmcs.com>
Updated by Jens to:
1) Merge this with the ioctl reset patch from David Sariel. The ioctl
path now shares the reset code from the sysfs path.
2) Don't flush work if we fail issuing the reset.
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 513908f..9682e29 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -80,6 +80,7 @@
static struct class *nvme_class;
static void nvme_reset_failed_dev(struct work_struct *ws);
+static int nvme_reset(struct nvme_dev *dev);
static int nvme_process_cq(struct nvme_queue *nvmeq);
struct async_cmd_info {
@@ -2689,6 +2690,9 @@
return -ENOTTY;
ns = list_first_entry(&dev->namespaces, struct nvme_ns, list);
return nvme_user_cmd(dev, ns, (void __user *)arg);
+ case NVME_IOCTL_RESET:
+ dev_warn(dev->dev, "resetting controller\n");
+ return nvme_reset(dev);
default:
return -ENOTTY;
}
@@ -2839,6 +2843,44 @@
dev->reset_workfn(work);
}
+static int nvme_reset(struct nvme_dev *dev)
+{
+ int ret = -EBUSY;
+
+ if (!dev->admin_q || blk_queue_dying(dev->admin_q))
+ return -ENODEV;
+
+ spin_lock(&dev_list_lock);
+ if (!work_pending(&dev->reset_work)) {
+ dev->reset_workfn = nvme_reset_failed_dev;
+ queue_work(nvme_workq, &dev->reset_work);
+ ret = 0;
+ }
+ spin_unlock(&dev_list_lock);
+
+ if (!ret) {
+ flush_work(&dev->reset_work);
+ return 0;
+ }
+
+ return ret;
+}
+
+static ssize_t nvme_sysfs_reset(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct nvme_dev *ndev = dev_get_drvdata(dev);
+ int ret;
+
+ ret = nvme_reset(ndev);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
+
static void nvme_async_probe(struct work_struct *work);
static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
@@ -2883,12 +2925,20 @@
goto release_pools;
}
get_device(dev->device);
+ dev_set_drvdata(dev->device, dev);
+
+ result = device_create_file(dev->device, &dev_attr_reset_controller);
+ if (result)
+ goto put_dev;
INIT_LIST_HEAD(&dev->node);
INIT_WORK(&dev->probe_work, nvme_async_probe);
schedule_work(&dev->probe_work);
return 0;
+ put_dev:
+ device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance));
+ put_device(dev->device);
release_pools:
nvme_release_prp_pools(dev);
release:
@@ -2919,10 +2969,12 @@
nvme_set_irq_hints(dev);
return;
reset:
+ spin_lock(&dev_list_lock);
if (!work_busy(&dev->reset_work)) {
dev->reset_workfn = nvme_reset_failed_dev;
queue_work(nvme_workq, &dev->reset_work);
}
+ spin_unlock(&dev_list_lock);
}
static void nvme_reset_notify(struct pci_dev *pdev, bool prepare)
@@ -2952,6 +3004,7 @@
pci_set_drvdata(pdev, NULL);
flush_work(&dev->probe_work);
flush_work(&dev->reset_work);
+ device_remove_file(dev->device, &dev_attr_reset_controller);
nvme_dev_shutdown(dev);
nvme_dev_remove(dev);
nvme_dev_remove_admin(dev);