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drm/virtio: implement context init: support init ioctl

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This implements the context initialization ioctl.  A list of params
is passed in by userspace, and kernel driver validates them.  The
only currently supported param is VIRTGPU_CONTEXT_PARAM_CAPSET_ID.

If the context has already been initialized, -EEXIST is returned.
This happens after Linux userspace does dumb_create + followed by
opening the Mesa virgl driver with the same virtgpu instance.

However, for most applications, 3D contexts will be explicitly
initialized when the feature is available.

Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois@gmail.com>
Acked-by: Lingfeng Yang <lfy@google.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210921232024.817-6-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Anthoine Bourgeois
2021-09-21 16:20:17 -07:00
committed by Gerd Hoffmann
parent 6198770a1f
commit 4fb530e5ca
3 changed files with 98 additions and 8 deletions
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6
drivers/gpu/drm/virtio/virtgpu_drv.h
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@@ -259,12 +259,13 @@ struct virtio_gpu_device {
struct virtio_gpu_fpriv {
uint32_t ctx_id;
uint32_t context_init;
bool context_created;
struct mutex context_lock;
};
/* virtgpu_ioctl.c */
#define DRM_VIRTIO_NUM_IOCTLS 11
#define DRM_VIRTIO_NUM_IOCTLS 12
extern struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS];
void virtio_gpu_create_context(struct drm_device *dev, struct drm_file *file);
@@ -342,7 +343,8 @@ int virtio_gpu_cmd_get_capset(struct virtio_gpu_device *vgdev,
struct virtio_gpu_drv_cap_cache **cache_p);
int virtio_gpu_cmd_get_edids(struct virtio_gpu_device *vgdev);
void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id,
uint32_t nlen, const char *name);
uint32_t context_init, uint32_t nlen,
const char *name);
void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev,
uint32_t id);
void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev,