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authorRob Clark <robdclark@gmail.com>2018-05-30 17:46:20 -0700
committerThomas Hellstrom <thellstrom@vmware.com>2018-12-05 10:00:37 +0100
commitb9fc5e01d1ce78eb53fd4dedd51a1563e636eea2 (patch)
treef3be8f1c2b0785dbd7458315b74fd88eea432714 /drivers/gpu
parentdrm/selftest: Add drm damage helper selftest (diff)
downloadlinux-dev-b9fc5e01d1ce78eb53fd4dedd51a1563e636eea2.tar.xz
linux-dev-b9fc5e01d1ce78eb53fd4dedd51a1563e636eea2.zip
drm: Add helper to implement legacy dirtyfb
Add an atomic helper to implement dirtyfb support. This is needed to support DSI command-mode panels with x11 userspace (ie. when we can't rely on pageflips to trigger a flush to the panel). v2: Modified the helper to use plane fb_damage_clips property and removed plane_state::dirty flag. v3: - Use uapi drm_mode_rect. - Support annotate flags. v4: Correct kernel doc. Signed-off-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Deepak Rawat <drawat@vmware.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/drm_damage_helper.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_damage_helper.c b/drivers/gpu/drm/drm_damage_helper.c
index f339b1481750..05c8e7267165 100644
--- a/drivers/gpu/drm/drm_damage_helper.c
+++ b/drivers/gpu/drm/drm_damage_helper.c
@@ -26,6 +26,7 @@
*
* Authors:
* Deepak Rawat <drawat@vmware.com>
+ * Rob Clark <robdclark@gmail.com>
*
**************************************************************************/
@@ -70,6 +71,21 @@
* rectangles clipped to &drm_plane_state.src.
*/
+static void convert_clip_rect_to_rect(const struct drm_clip_rect *src,
+ struct drm_mode_rect *dest,
+ uint32_t num_clips, uint32_t src_inc)
+{
+ while (num_clips > 0) {
+ dest->x1 = src->x1;
+ dest->y1 = src->y1;
+ dest->x2 = src->x2;
+ dest->y2 = src->y2;
+ src += src_inc;
+ dest++;
+ num_clips--;
+ }
+}
+
/**
* drm_plane_enable_fb_damage_clips - Enables plane fb damage clips property.
* @plane: Plane on which to enable damage clips property.
@@ -121,6 +137,116 @@ void drm_atomic_helper_check_plane_damage(struct drm_atomic_state *state,
EXPORT_SYMBOL(drm_atomic_helper_check_plane_damage);
/**
+ * drm_atomic_helper_dirtyfb - Helper for dirtyfb.
+ * @fb: DRM framebuffer.
+ * @file_priv: Drm file for the ioctl call.
+ * @flags: Dirty fb annotate flags.
+ * @color: Color for annotate fill.
+ * @clips: Dirty region.
+ * @num_clips: Count of clip in clips.
+ *
+ * A helper to implement &drm_framebuffer_funcs.dirty using damage interface
+ * during plane update. If num_clips is 0 then this helper will do a full plane
+ * update. This is the same behaviour expected by DIRTFB IOCTL.
+ *
+ * Note that this helper is blocking implementation. This is what current
+ * drivers and userspace expect in their DIRTYFB IOCTL implementation, as a way
+ * to rate-limit userspace and make sure its rendering doesn't get ahead of
+ * uploading new data too much.
+ *
+ * Return: Zero on success, negative errno on failure.
+ */
+int drm_atomic_helper_dirtyfb(struct drm_framebuffer *fb,
+ struct drm_file *file_priv, unsigned int flags,
+ unsigned int color, struct drm_clip_rect *clips,
+ unsigned int num_clips)
+{
+ struct drm_modeset_acquire_ctx ctx;
+ struct drm_property_blob *damage = NULL;
+ struct drm_mode_rect *rects = NULL;
+ struct drm_atomic_state *state;
+ struct drm_plane *plane;
+ int ret = 0;
+
+ /*
+ * When called from ioctl, we are interruptable, but not when called
+ * internally (ie. defio worker)
+ */
+ drm_modeset_acquire_init(&ctx,
+ file_priv ? DRM_MODESET_ACQUIRE_INTERRUPTIBLE : 0);
+
+ state = drm_atomic_state_alloc(fb->dev);
+ if (!state) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ state->acquire_ctx = &ctx;
+
+ if (clips) {
+ uint32_t inc = 1;
+
+ if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY) {
+ inc = 2;
+ num_clips /= 2;
+ }
+
+ rects = kcalloc(num_clips, sizeof(*rects), GFP_KERNEL);
+ if (!rects) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ convert_clip_rect_to_rect(clips, rects, num_clips, inc);
+ damage = drm_property_create_blob(fb->dev,
+ num_clips * sizeof(*rects),
+ rects);
+ if (IS_ERR(damage)) {
+ ret = PTR_ERR(damage);
+ damage = NULL;
+ goto out;
+ }
+ }
+
+retry:
+ drm_for_each_plane(plane, fb->dev) {
+ struct drm_plane_state *plane_state;
+
+ if (plane->state->fb != fb)
+ continue;
+
+ plane_state = drm_atomic_get_plane_state(state, plane);
+ if (IS_ERR(plane_state)) {
+ ret = PTR_ERR(plane_state);
+ goto out;
+ }
+
+ drm_property_replace_blob(&plane_state->fb_damage_clips,
+ damage);
+ }
+
+ ret = drm_atomic_commit(state);
+
+out:
+ if (ret == -EDEADLK) {
+ drm_atomic_state_clear(state);
+ ret = drm_modeset_backoff(&ctx);
+ if (!ret)
+ goto retry;
+ }
+
+ drm_property_blob_put(damage);
+ kfree(rects);
+ drm_atomic_state_put(state);
+
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+
+ return ret;
+
+}
+EXPORT_SYMBOL(drm_atomic_helper_dirtyfb);
+
+/**
* drm_atomic_helper_damage_iter_init - Initialize the damage iterator.
* @iter: The iterator to initialize.
* @old_state: Old plane state for validation.