On 9/24/25 22:47, [email protected] wrote: > From: Dongwon Kim <[email protected]> > > Register a PM notifier in virtio-gpu to handle suspend/hibernate > events. On PM_POST_HIBERNATION, it resubmits all GPU objects > so that resources can properly recovered in QEMU after resume. > > Suggested-by: Dmitry Osipenko <[email protected]> > Cc: Vivek Kasireddy <[email protected]> > Signed-off-by: Dongwon Kim <[email protected]> > --- > drivers/gpu/drm/virtio/virtgpu_drv.h | 2 ++ > drivers/gpu/drm/virtio/virtgpu_kms.c | 25 +++++++++++++++++++++++++ > 2 files changed, 27 insertions(+) > > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h > b/drivers/gpu/drm/virtio/virtgpu_drv.h > index 55f836378237..88a94e974088 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_drv.h > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h > @@ -278,6 +278,8 @@ struct virtio_gpu_device { > uint64_t capset_id_mask; > struct list_head cap_cache; > > + struct notifier_block pm_nb; > + > /* protects uuid state when exporting */ > spinlock_t resource_export_lock; > /* protects map state and host_visible_mm */ > diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c > b/drivers/gpu/drm/virtio/virtgpu_kms.c > index 08f8e71a7072..e1b2cee30fa3 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_kms.c > +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c > @@ -26,9 +26,12 @@ > #include <linux/virtio.h> > #include <linux/virtio_config.h> > #include <linux/virtio_ring.h> > +#include <linux/suspend.h> > +#include <linux/pm_runtime.h> > > #include <drm/drm_file.h> > #include <drm/drm_managed.h> > +#include <drm/drm_atomic_helper.h> > > #include "virtgpu_drv.h" > > @@ -133,6 +136,21 @@ int virtio_gpu_find_vqs(struct virtio_gpu_device *vgdev) > return 0; > } > > +static int virtio_gpu_pm_notifier(struct notifier_block *nb, unsigned long > mode, > + void *data) > +{ > + struct virtio_gpu_device *vgdev = container_of(nb, struct > virtio_gpu_device, pm_nb); > + int ret; > + > + if (mode == PM_POST_HIBERNATION) { > + ret = virtio_gpu_object_restore_all(vgdev); > + if (ret) > + DRM_ERROR("Failed to resubmit virtio-gpu objects\n"); > + } > + > + return NOTIFY_DONE; > +} > + > int virtio_gpu_init(struct virtio_device *vdev, struct drm_device *dev) > { > struct virtio_gpu_device *vgdev; > @@ -268,6 +286,12 @@ int virtio_gpu_init(struct virtio_device *vdev, struct > drm_device *dev) > wait_event_timeout(vgdev->resp_wq, !vgdev->display_info_pending, > 5 * HZ); > } > + > + vgdev->pm_nb.notifier_call = virtio_gpu_pm_notifier; > + ret = register_pm_notifier(&vgdev->pm_nb); > + if (ret) > + goto err_scanouts; > + > return 0; > > err_scanouts: > @@ -299,6 +323,7 @@ void virtio_gpu_deinit(struct drm_device *dev) > flush_work(&vgdev->config_changed_work); > virtio_reset_device(vgdev->vdev); > vgdev->vdev->config->del_vqs(vgdev->vdev); > + unregister_pm_notifier(&vgdev->pm_nb); > } > > void virtio_gpu_release(struct drm_device *dev)
Tested-by: Dmitry Osipenko <[email protected]> -- Best regards, Dmitry
