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drm/virtio: Implement VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING cmd

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This cmd is useful to let the VMM (i.e, Qemu) know that the backing
store associated with a resource is no longer valid, so that the VMM
can perform any cleanup or unmap operations.

The fence related changes and virtio_gpu_object_detach()/
virtio_gpu_detach_object_fenced() routines are extracted from a
patch by Dmitry Osipenko <dmitry.osipenko@collabora.com>.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Gurchetan Singh <gurchetansingh@chromium.org>
Cc: Chia-I Wu <olvaffe@gmail.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241126031643.3490496-2-vivek.kasireddy@intel.com
This commit is contained in:
Vivek Kasireddy 2024-11-25 19:13:42 -08:00 committed by Dmitry Osipenko
parent c1bae6802e
commit 06a0f77195
3 changed files with 61 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/gpu/drm/virtio/virtgpu_drv.h
View file

@ -92,6 +92,7 @@ struct virtio_gpu_object {
uint32_t hw_res_handle;
bool dumb;
bool created;
bool attached;
bool host3d_blob, guest_blob;
uint32_t blob_mem, blob_flags;
@ -353,6 +354,10 @@ void virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *obj,
struct virtio_gpu_mem_entry *ents,
unsigned int nents);
void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *obj,
struct virtio_gpu_fence *fence);
int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo);
void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
struct virtio_gpu_output *output);
int virtio_gpu_cmd_get_display_info(struct virtio_gpu_device *vgdev);

21
drivers/gpu/drm/virtio/virtgpu_object.c
View file

@ -97,6 +97,27 @@ static void virtio_gpu_free_object(struct drm_gem_object *obj)
virtio_gpu_cleanup_object(bo);
}
int virtio_gpu_detach_object_fenced(struct virtio_gpu_object *bo)
{
struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
struct virtio_gpu_fence *fence;
if (!bo->attached)
return 0;
fence = virtio_gpu_fence_alloc(vgdev, vgdev->fence_drv.context, 0);
if (!fence)
return -ENOMEM;
virtio_gpu_object_detach(vgdev, bo, fence);
virtio_gpu_notify(vgdev);
dma_fence_wait(&fence->f, false);
dma_fence_put(&fence->f);
return 0;
}
static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
.free = virtio_gpu_free_object,
.open = virtio_gpu_gem_object_open,

35
drivers/gpu/drm/virtio/virtgpu_vq.c
View file

@ -645,6 +645,23 @@ virtio_gpu_cmd_resource_attach_backing(struct virtio_gpu_device *vgdev,
virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
}
static void
virtio_gpu_cmd_resource_detach_backing(struct virtio_gpu_device *vgdev,
uint32_t resource_id,
struct virtio_gpu_fence *fence)
{
struct virtio_gpu_resource_detach_backing *cmd_p;
struct virtio_gpu_vbuffer *vbuf;
cmd_p = virtio_gpu_alloc_cmd(vgdev, &vbuf, sizeof(*cmd_p));
memset(cmd_p, 0, sizeof(*cmd_p));
cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING);
cmd_p->resource_id = cpu_to_le32(resource_id);
virtio_gpu_queue_fenced_ctrl_buffer(vgdev, vbuf, fence);
}
static void virtio_gpu_cmd_get_display_info_cb(struct virtio_gpu_device *vgdev,
struct virtio_gpu_vbuffer *vbuf)
{
@ -1103,8 +1120,26 @@ void virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
struct virtio_gpu_mem_entry *ents,
unsigned int nents)
{
if (obj->attached)
return;
virtio_gpu_cmd_resource_attach_backing(vgdev, obj->hw_res_handle,
ents, nents, NULL);
obj->attached = true;
}
void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object *obj,
struct virtio_gpu_fence *fence)
{
if (!obj->attached)
return;
virtio_gpu_cmd_resource_detach_backing(vgdev, obj->hw_res_handle,
fence);
obj->attached = false;
}
void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,