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authorDaniel Vetter <daniel.vetter@ffwll.ch>2014-07-25 18:07:40 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2014-08-08 17:46:45 +0200
commitd059f652e73c35678d28d4cd09ab2cec89696af9 (patch)
treee16e275dbe7435bfcb7519e603f7826abc26fc8c /include/drm/drm_modeset_lock.h
parentdrm: Move modeset_lock_all helpers to drm_modeset_lock.[hc] (diff)
downloadlinux-d059f652e73c35678d28d4cd09ab2cec89696af9.tar.xz
linux-d059f652e73c35678d28d4cd09ab2cec89696af9.zip
drm: Handle legacy per-crtc locking with full acquire ctx
So drivers using the atomic interfaces expect that they can acquire additional locks internal to the driver as-needed. Examples would be locks to protect shared state like shared display PLLs. Unfortunately the legacy ioctls assume that all locking is fully done by the drm core. Now for those paths which grab all locks we already have to keep around an acquire context in dev->mode_config. Helper functions that implement legacy interfaces in terms of atomic support can therefore grab this acquire contexts and reuse it. The only interfaces left are the cursor and pageflip ioctls. So add functions to grab the crtc lock these need using an acquire context and preserve it for atomic drivers to reuse. v2: - Fixup comments&kerneldoc. - Drop the WARNING from modeset_lock_all_crtcs since that can be used in legacy paths with crtc locking. v3: Fix a type on the kerneldoc Dave spotted. Cc: Dave Airlie <airlied@redhat.com> Reviewed-by: Dave Airlie <airlied@redhat.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'include/drm/drm_modeset_lock.h')
-rw-r--r--include/drm/drm_modeset_lock.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/drm/drm_modeset_lock.h b/include/drm/drm_modeset_lock.h
index cf61e857bc06..d38e1508f11a 100644
--- a/include/drm/drm_modeset_lock.h
+++ b/include/drm/drm_modeset_lock.h
@@ -120,10 +120,15 @@ int drm_modeset_lock_interruptible(struct drm_modeset_lock *lock,
void drm_modeset_unlock(struct drm_modeset_lock *lock);
struct drm_device;
+struct drm_crtc;
void drm_modeset_lock_all(struct drm_device *dev);
void drm_modeset_unlock_all(struct drm_device *dev);
+void drm_modeset_lock_crtc(struct drm_crtc *crtc);
+void drm_modeset_unlock_crtc(struct drm_crtc *crtc);
void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
+struct drm_modeset_acquire_ctx *
+drm_modeset_legacy_acquire_ctx(struct drm_crtc *crtc);
int drm_modeset_lock_all_crtcs(struct drm_device *dev,
struct drm_modeset_acquire_ctx *ctx);