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authorRob Clark <robdclark@gmail.com>2015-02-05 17:41:52 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-02-14 01:28:12 +0300
commite3eb3250d84ef97b766312345774367b6a310db8 (patch)
tree7220c957097ad78df34d6d2aeacc8afdadb1a9d4 /drivers/gpu/drm/drm_ioctl.c
parent17d5538d54c9f9d6e2b44e07d4d577304e22c17a (diff)
downloadlinux-e3eb3250d84ef97b766312345774367b6a310db8.tar.xz
drm: add support for tiled/compressed/etc modifier in addfb2
In DRM/KMS we are lacking a good way to deal with tiled/compressed formats. Especially in the case of dmabuf/prime buffer sharing, where we cannot always rely on under-the-hood flags passed to driver specific gem-create ioctl to pass around these extra flags. The proposal is to add a per-plane format modifier. This allows to, if necessary, use different tiling patters for sub-sampled planes, etc. The format modifiers are added at the end of the ioctl struct, so for legacy userspace it will be zero padded. v1: original v1.5: increase modifier to 64b v2: Incorporate review comments from the big thread, plus a few more. - Add a getcap so that userspace doesn't have to jump through hoops. - Allow modifiers only when a flag is set. That way drivers know when they're dealing with old userspace and need to fish out e.g. tiling from other information. - After rolling out checks for ->modifier to all drivers I've decided that this is way too fragile and needs an explicit opt-in flag. So do that instead. - Add a define (just for documentation really) for the "NONE" modifier. Imo we don't need to add mask #defines since drivers really should only do exact matches against values defined with fourcc_mod_code. - Drop the Samsung tiling modifier on Rob's request since he's not yet sure whether that one is accurate. v3: - Also add a new ->modifier[] array to struct drm_framebuffer and fill it in drm_helper_mode_fill_fb_struct. Requested by Tvrkto Uruslin. - Remove TODO in comment and add code comment that modifiers should be properly documented, requested by Rob. Cc: Rob Clark <robdclark@gmail.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Daniel Stone <daniel@fooishbar.org> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Michel Dänzer <michel@daenzer.net> Signed-off-by: Rob Clark <robdclark@gmail.com> (v1.5) Reviewed-by: Rob Clark <robdclark@gmail.com> Reviewed-by: Daniel Stone <daniels@collabora.com> Acked-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'drivers/gpu/drm/drm_ioctl.c')
-rw-r--r--drivers/gpu/drm/drm_ioctl.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 3785d66721f2..a6d773a61c2d 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -321,6 +321,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
else
req->value = 64;
break;
+ case DRM_CAP_ADDFB2_MODIFIERS:
+ req->value = dev->mode_config.allow_fb_modifiers;
+ break;
default:
return -EINVAL;
}