NVMe: Schedule reset for failed controllers

Schedules a controller reset when it indicates it has a failed status. If
the device does not become ready after a reset, the pci device will be
scheduled for removal.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[fixed checkpatch issue]
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 000bca4..2f5b9f5 100644 (file)
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -60,6 +60,8 @@ static LIST_HEAD(dev_list);
 static struct task_struct *nvme_thread;
 static struct workqueue_struct *nvme_workq;
 
+static void nvme_reset_failed_dev(struct work_struct *ws);
+
 /*
  * An NVM Express queue.  Each device has at least two (one for admin
  * commands and one for I/O commands).
@@ -1612,13 +1614,25 @@ static void nvme_resubmit_bios(struct nvme_queue *nvmeq)
 
 static int nvme_kthread(void *data)
 {
-       struct nvme_dev *dev;
+       struct nvme_dev *dev, *next;
 
        while (!kthread_should_stop()) {
                set_current_state(TASK_INTERRUPTIBLE);
                spin_lock(&dev_list_lock);
-               list_for_each_entry(dev, &dev_list, node) {
+               list_for_each_entry_safe(dev, next, &dev_list, node) {
                        int i;
+                       if (readl(&dev->bar->csts) & NVME_CSTS_CFS &&
+                                                       dev->initialized) {
+                               if (work_busy(&dev->reset_work))
+                                       continue;
+                               list_del_init(&dev->node);
+                               dev_warn(&dev->pci_dev->dev,
+                                       "Failed status, reset controller\n");
+                               INIT_WORK(&dev->reset_work,
+                                                       nvme_reset_failed_dev);
+                               queue_work(nvme_workq, &dev->reset_work);
+                               continue;
+                       }
                        for (i = 0; i < dev->queue_count; i++) {
                                struct nvme_queue *nvmeq = dev->queues[i];
                                if (!nvmeq)
@@ -2006,6 +2020,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
 {
        int i;
 
+       dev->initialized = 0;
        for (i = dev->queue_count - 1; i >= 0; i--)
                nvme_disable_queue(dev, i);
 
@@ -2196,6 +2211,7 @@ static int nvme_dev_resume(struct nvme_dev *dev)
                queue_work(nvme_workq, &dev->reset_work);
                spin_unlock(&dev_list_lock);
        }
+       dev->initialized = 1;
        return 0;
 }
 
@@ -2269,6 +2285,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
        if (result)
                goto remove;
 
+       dev->initialized = 1;
        kref_init(&dev->kref);
        return 0;
 

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index eed81cc..117d877 100644 (file)
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -95,6 +95,7 @@ struct nvme_dev {
        u32 max_hw_sectors;
        u32 stripe_size;
        u16 oncs;
+       u8 initialized;
 };
 
 /*