From a0ec4fb63f5ce15732f8dadc63c931bdf9ff98b5 Mon Sep 17 00:00:00 2001 From: Israel Rukshin Date: Wed, 27 Nov 2024 08:57:31 +0200 Subject: virtio_pci: Add support for PCIe Function Level Reset Implement support for Function Level Reset (FLR) in virtio_pci devices. This change adds reset_prepare and reset_done callbacks, allowing drivers to properly handle FLR operations. Without this patch, performing and recovering from an FLR is not possible for virtio_pci devices. This implementation ensures proper FLR handling and recovery for both physical and virtual functions. The device reset can be triggered in case of error or manually via sysfs: echo 1 > /sys/bus/pci/devices/$PCI_ADDR/reset Signed-off-by: Israel Rukshin Reviewed-by: Max Gurtovoy Message-Id: <1732690652-3065-2-git-send-email-israelr@nvidia.com> Signed-off-by: Michael S. Tsirkin --- include/linux/virtio.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include') diff --git a/include/linux/virtio.h b/include/linux/virtio.h index dd88682e27e3..4d16c13d0df5 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -190,6 +190,8 @@ int virtio_device_freeze(struct virtio_device *dev); int virtio_device_restore(struct virtio_device *dev); #endif void virtio_reset_device(struct virtio_device *dev); +int virtio_device_reset_prepare(struct virtio_device *dev); +int virtio_device_reset_done(struct virtio_device *dev); size_t virtio_max_dma_size(const struct virtio_device *vdev); @@ -214,6 +216,10 @@ size_t virtio_max_dma_size(const struct virtio_device *vdev); * changes; may be called in interrupt context. * @freeze: optional function to call during suspend/hibernation. * @restore: optional function to call on resume. + * @reset_prepare: optional function to call when a transport specific reset + * occurs. + * @reset_done: optional function to call after transport specific reset + * operation has finished. */ struct virtio_driver { struct device_driver driver; @@ -229,6 +235,8 @@ struct virtio_driver { void (*config_changed)(struct virtio_device *dev); int (*freeze)(struct virtio_device *dev); int (*restore)(struct virtio_device *dev); + int (*reset_prepare)(struct virtio_device *dev); + int (*reset_done)(struct virtio_device *dev); }; #define drv_to_virtio(__drv) container_of_const(__drv, struct virtio_driver, driver) -- cgit v1.2.3