If a device has a primary node, it doesn't necessarily mean it's
suitable for KMS usage. For instance, render-only drivers also
expose primary nodes.
The check is extracted from Weston [1].
The motivation for this new function is two-fold:
- Avoid an unnecessary GETRESOURCES call. To check whether a
primary node is suitable for KMS, we don't actually need to
retrieve the object IDs we just need to check the counts.
- Avoid confusion in user-space and make sure user-space implements
the check properly. For instance, wlroots doesn't [2]: it uses
drmGetVersion which succeeds with render-only drivers.
[1]: https://gitlab.freedesktop.org/wayland/weston/-/blob/master/libweston/backend-drm/drm.c#L2689
[2]: a290d7a78d/backend/session/session.c (L268)
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Add a wrapper around the getfb2 ioctl, which returns extended
framebuffer information mirroring addfb2, including multiple planes and
modifiers.
Changes since v7:
- add new symbols to core-symbol.txt (Eric Engestrom)
Changes since v5:
- style change
Changes since v4:
- Set fb_id at init instead of memclear() and set (Eric Engestrom)
Changes since v3:
- remove unnecessary null check in drmModeFreeFB2 (Daniel Stone)
Changes since v2:
- getfb2 ioctl has been merged upstream
- sync include/drm/drm.h in a seperate patch
Changes since v1:
- functions should be drm_public
- modifier should be 64 bits
- update ioctl number
Signed-off-by: Juston Li <juston.li@intel.com>
Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
All the libdrm_* submodules have symbols checks, no reason to keep core
libdrm wild.
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Acked-by: Emil Velikov <emil.velikov@collabora.com>
Simon Ser
Daniel Stone
Eric Engestrom