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virgl: Implement resource_create_with_modifiers

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The .resource_create_with_modifiers() callback became required after
7d1a32fafd for venus to work in KMS mode. This fixes GBM buffer
allocation failure for vkmark-kms and fixes implicit modifier not
working on host when using Intel i915 driver for running Steam with
gamescope-kms on guest. Note that KMS support for venus on QEMU never
worked before, hence this is not regression fix.

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37646>
This commit is contained in:
Dmitry Osipenko 2025-09-05 10:40:09 +00:00 • committed by Marge Bot
parent d06aff2243
commit 29b64d6636
1 changed files with 24 additions and 0 deletions
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24
src/gallium/drivers/virgl/virgl_resource.c
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@ -20,6 +20,7 @@
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "util/u_drm.h"
#include "util/format/u_format.h"
#include "util/u_inlines.h"
#include "util/u_memory.h"
@ -30,6 +31,10 @@
#include "virgl_staging_mgr.h"
#include "virgl_encode.h" // for declaration of virgl_encode_copy_transfer
#if !defined(_WIN32)
#include "drm-uapi/drm_fourcc.h"
#endif
/* A (soft) limit for the amount of memory we want to allow for queued staging
* resources. This is used to decide when we should force a flush, in order to
* avoid exhausting virtio-gpu memory.
@ -707,6 +712,22 @@ static struct pipe_resource *virgl_resource_create(struct pipe_screen *screen,
return virgl_resource_create_front(screen, templ, NULL);
}
#if !defined(_WIN32)
static struct pipe_resource *
virgl_resource_create_with_modifiers(struct pipe_screen *screen,
const struct pipe_resource *templ,
const uint64_t *modifiers,
int count)
{
if (!drm_find_modifier(DRM_FORMAT_MOD_LINEAR, modifiers, count)) {
mesa_loge("unsupported modifier requested\n");
return NULL;
}
return virgl_resource_create_front(screen, templ, NULL);
}
#endif
static struct pipe_resource *virgl_resource_from_handle(struct pipe_screen *screen,
const struct pipe_resource *templ,
struct winsys_handle *whandle,
@ -842,6 +863,9 @@ void virgl_init_screen_resource_functions(struct pipe_screen *screen)
screen->resource_get_handle = virgl_resource_get_handle;
screen->resource_destroy = virgl_resource_destroy;
screen->resource_get_param = virgl_resource_get_param;
#if !defined(_WIN32)
screen->resource_create_with_modifiers = virgl_resource_create_with_modifiers;
#endif
}
static void virgl_buffer_subdata(struct pipe_context *pipe,