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drm: introduce DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP

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This new kernel capability indicates whether async page-flips are
supported via the atomic uAPI. DRM clients can use it to check
for support before feeding DRM_MODE_PAGE_FLIP_ASYNC to the kernel.

Make it clear that DRM_CAP_ASYNC_PAGE_FLIP is for legacy uAPI only.

Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patchwork.freedesktop.org/patch/msgid/20231122161941.320564-4-andrealmeid@igalia.com
This commit is contained in:
Simon Ser 2023-11-22 13:19:40 -03:00
parent 4b4af74ab9
commit e4d983acff
2 changed files with 13 additions and 1 deletions
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4
drivers/gpu/drm/drm_ioctl.c
View file

@ -301,6 +301,10 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
case DRM_CAP_CRTC_IN_VBLANK_EVENT:
req->value = 1;
break;
case DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP:
req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) &&
dev->mode_config.async_page_flip;
break;
default:
return -EINVAL;
}

10
include/uapi/drm/drm.h
View file

@ -713,7 +713,8 @@ struct drm_gem_open {
/**
* DRM_CAP_ASYNC_PAGE_FLIP
*
* If set to 1, the driver supports &DRM_MODE_PAGE_FLIP_ASYNC.
* If set to 1, the driver supports &DRM_MODE_PAGE_FLIP_ASYNC for legacy
* page-flips.
*/
#define DRM_CAP_ASYNC_PAGE_FLIP 0x7
/**
@ -773,6 +774,13 @@ struct drm_gem_open {
* :ref:`drm_sync_objects`.
*/
#define DRM_CAP_SYNCOBJ_TIMELINE 0x14
/**
* DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP
*
* If set to 1, the driver supports &DRM_MODE_PAGE_FLIP_ASYNC for atomic
* commits.
*/
#define DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP 0x15
/* DRM_IOCTL_GET_CAP ioctl argument type */
struct drm_get_cap {