NVMe: Time out initialisation after a few seconds

THe device reports (in its capability register) how long it will take
to initialise.  If that time elapses before the ready bit becomes set,
conclude the device is broken and refuse to initialise it.  Log a nice
error message so the user knows why we did nothing.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index bcc780a..57f2b33 100644 (file)
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -893,6 +893,8 @@ static int __devinit nvme_configure_admin_queue(struct nvme_dev *dev)
 {
        int result;
        u32 aqa;
+       u64 cap;
+       unsigned long timeout;
        struct nvme_queue *nvmeq;
 
        dev->dbs = ((void __iomem *)dev->bar) + 4096;
@@ -915,10 +917,18 @@ static int __devinit nvme_configure_admin_queue(struct nvme_dev *dev)
        writeq(nvmeq->cq_dma_addr, &dev->bar->acq);
        writel(dev->ctrl_config, &dev->bar->cc);
 
+       cap = readq(&dev->bar->cap);
+       timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
+
        while (!(readl(&dev->bar->csts) & NVME_CSTS_RDY)) {
                msleep(100);
                if (fatal_signal_pending(current))
                        return -EINTR;
+               if (time_after(jiffies, timeout)) {
+                       dev_err(&dev->pci_dev->dev,
+                               "Device not ready; aborting initialisation\n");
+                       return -ENODEV;
+               }
        }
 
        result = queue_request_irq(dev, nvmeq, "nvme admin");

diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 9d6febb..a19304f 100644 (file)
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -35,6 +35,8 @@ struct nvme_bar {
        __u64                   acq;    /* Admin CQ Base Address */
 };
 
+#define NVME_CAP_TIMEOUT(cap)  (((cap) >> 24) & 0xff)
+
 enum {
        NVME_CC_ENABLE          = 1 << 0,
        NVME_CC_CSS_NVM         = 0 << 4,