From: Jason Wang <jasowang@redhat.com>
To: Max Gurtovoy <mgurtovoy@nvidia.com>,
mst@redhat.com, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org
Cc: nitzanc@nvidia.com, oren@nvidia.com, cohuck@redhat.com
Subject: Re: [PATCH v2 2/3] virito_pci: add timeout to reset device operation
Date: Thu, 8 Apr 2021 17:01:32 +0800 [thread overview]
Message-ID: <2bead2b3-fa23-dc1e-3200-ddfa24944b75@redhat.com> (raw)
In-Reply-To: <20210408081109.56537-2-mgurtovoy@nvidia.com>
在 2021/4/8 下午4:11, Max Gurtovoy 写道:
> According to the spec after writing 0 to device_status, the driver MUST
> wait for a read of device_status to return 0 before reinitializing the
> device. In case we have a device that won't return 0, the reset
> operation will loop forever and cause the host/vm to stuck. Set timeout
> for 3 minutes before giving up on the device.
>
> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
> ---
> drivers/virtio/virtio_pci_modern.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> index cc3412a96a17..dcee616e8d21 100644
> --- a/drivers/virtio/virtio_pci_modern.c
> +++ b/drivers/virtio/virtio_pci_modern.c
> @@ -162,6 +162,7 @@ static int vp_reset(struct virtio_device *vdev)
> {
> struct virtio_pci_device *vp_dev = to_vp_device(vdev);
> struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> + unsigned long timeout = jiffies + msecs_to_jiffies(180000);
>
> /* 0 status means a reset. */
> vp_modern_set_status(mdev, 0);
> @@ -169,9 +170,16 @@ static int vp_reset(struct virtio_device *vdev)
> * device_status to return 0 before reinitializing the device.
> * This will flush out the status write, and flush in device writes,
> * including MSI-X interrupts, if any.
> + * Set a timeout before giving up on the device.
> */
> - while (vp_modern_get_status(mdev))
> + while (vp_modern_get_status(mdev)) {
> + if (time_after(jiffies, timeout)) {
What happens if the device finish the rest after the timeout?
Thanks
> + dev_err(&vdev->dev, "virtio: device not ready. "
> + "Aborting. Try again later\n");
> + return -EAGAIN;
> + }
> msleep(1);
> + }
> /* Flush pending VQ/configuration callbacks. */
> vp_synchronize_vectors(vdev);
> return 0;
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next prev parent reply other threads:[~2021-04-08 9:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210408081109.56537-1-mgurtovoy@nvidia.com>
2021-04-08 8:58 ` [PATCH v2 1/3] virtio: update reset callback to return status Jason Wang
[not found] ` <1f134102-4ccb-57e3-858d-3922d851ce8a@nvidia.com>
2021-04-08 13:14 ` Jason Wang
[not found] ` <103ae6fe-1ffc-90a3-09cd-bcbbcbb8eee7@nvidia.com>
2021-04-09 5:22 ` Jason Wang
[not found] ` <96742dde-edba-0329-c9c2-b3ac3b28cf1d@nvidia.com>
2021-04-12 9:07 ` Michael S. Tsirkin
[not found] ` <e1e4a42c-2e87-adc1-9089-1c722f02b810@nvidia.com>
2021-04-12 21:29 ` Michael S. Tsirkin
2021-04-08 15:56 ` Michael S. Tsirkin
[not found] ` <31fa92ca-bce5-b71f-406d-8f3951b2143c@nvidia.com>
2021-04-12 12:04 ` Michael S. Tsirkin
[not found] ` <b99e324b-3a78-b3ed-98a8-a3b88a271338@nvidia.com>
2021-04-12 21:23 ` Michael S. Tsirkin
[not found] ` <10e099a9-2e3d-8c39-138a-17b2674b5389@nvidia.com>
2021-04-13 2:42 ` Jason Wang
2021-04-13 4:52 ` Michael S. Tsirkin
2021-04-13 4:42 ` Michael S. Tsirkin
[not found] ` <20210408081109.56537-2-mgurtovoy@nvidia.com>
2021-04-08 9:01 ` Jason Wang [this message]
[not found] ` <a00abefe-790d-8239-ac42-9f70daa7a25c@nvidia.com>
2021-04-08 12:45 ` [PATCH v2 2/3] virito_pci: add timeout to reset device operation Jason Wang
[not found] ` <7ed9cafa-498e-156d-c667-6da3fa432b18@nvidia.com>
2021-04-08 13:18 ` Jason Wang
2021-04-08 16:18 ` [PATCH v2 1/3] virtio: update reset callback to return status Michael S. Tsirkin
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