diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2018-09-13 16:16:21 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2018-09-13 18:44:06 +0300 |
| commit | 18ace11f87e69454379a3a1247a657b70ca142fc (patch) | |
| tree | 570818abaa848dbd6811fec47b2f255d921e690f /include/drm/drm_device.h | |
| parent | 169cc4c7a14e988985c8833ddec2f3e897de2c28 (diff) | |
drm: Introduce per-device driver_features
We wish to control certain driver_features flags on a per-device basis
while still sharing a single drm_driver instance across all the
devices. To that end introduce device.driver_features. By default
it will be set to ~0 to not impose any limits beyond
driver.driver_features. Drivers can then clear specific flags
in the per-device bitmask to limit the capabilities of the device.
An alternative approach would be to copy the driver_features from
the driver into the device in drm_dev_init(), however that would
require verifying that no driver is currently changing
driver.driver_features after drm_dev_init(). Hence the ~0 apporach
was easier.
Ideally we'd also make drm_driver const but there is plenty of code
left that wants to mutate it (eg. various vfunc assignments). We'll
need to fix all that up before we can make it const.
And while at it fix up the type of the feature flag passed to
drm_core_check_feature().
v2: Streamline the && vs. & (Chris)
s/int/u32/ in drm_core_check_feature() args
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180913131622.17690-1-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Diffstat (limited to 'include/drm/drm_device.h')
| -rw-r--r-- | include/drm/drm_device.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h index f9c6e0e3aec7..42411b3ea0c8 100644 --- a/include/drm/drm_device.h +++ b/include/drm/drm_device.h @@ -46,6 +46,16 @@ struct drm_device { struct drm_master *master; /** + * @driver_features: per-device driver features + * + * Drivers can clear specific flags here to disallow + * certain features on a per-device basis while still + * sharing a single &struct drm_driver instance across + * all devices. + */ + u32 driver_features; + + /** * @unplugged: * * Flag to tell if the device has been unplugged. |