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drm: Stop updating plane->crtc/fb/old_fb on atomic drivers

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Stop playing around with plane->crtc/fb/old_fb with atomic
drivers. Make life a lot simpler when we don't have to do the
magic old_fb vs. fb dance around plane updates. That way we
can't risk plane->fb getting out of sync with plane->state->fb
and we're less likely to leak any refcounts as well.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180525185045.29689-14-ville.syrjala@linux.intel.com
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Ville Syrjälä
2018-05-25 21:50:45 +03:00
parent 2f958af7fc
commit e00fb8564e
8 changed files with 24 additions and 87 deletions
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55
drivers/gpu/drm/drm_atomic.c
View File

@@ -692,6 +692,11 @@ drm_atomic_get_plane_state(struct drm_atomic_state *state,
WARN_ON(!state->acquire_ctx);
/* the legacy pointers should never be set */
WARN_ON(plane->fb);
WARN_ON(plane->old_fb);
WARN_ON(plane->crtc);
plane_state = drm_atomic_get_existing_plane_state(state, plane);
if (plane_state)
return plane_state;
@@ -2039,45 +2044,6 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
return ret;
}
/**
* drm_atomic_clean_old_fb -- Unset old_fb pointers and set plane->fb pointers.
*
* @dev: drm device to check.
* @plane_mask: plane mask for planes that were updated.
* @ret: return value, can be -EDEADLK for a retry.
*
* Before doing an update &drm_plane.old_fb is set to &drm_plane.fb, but before
* dropping the locks old_fb needs to be set to NULL and plane->fb updated. This
* is a common operation for each atomic update, so this call is split off as a
* helper.
*/
void drm_atomic_clean_old_fb(struct drm_device *dev,
unsigned plane_mask,
int ret)
{
struct drm_plane *plane;
/* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
* locks (ie. while it is still safe to deref plane->state). We
* need to do this here because the driver entry points cannot
* distinguish between legacy and atomic ioctls.
*/
drm_for_each_plane_mask(plane, dev, plane_mask) {
if (ret == 0) {
struct drm_framebuffer *new_fb = plane->state->fb;
if (new_fb)
drm_framebuffer_get(new_fb);
plane->fb = new_fb;
plane->crtc = plane->state->crtc;
if (plane->old_fb)
drm_framebuffer_put(plane->old_fb);
}
plane->old_fb = NULL;
}
}
EXPORT_SYMBOL(drm_atomic_clean_old_fb);
/**
* DOC: explicit fencing properties
*
@@ -2298,9 +2264,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
unsigned int copied_objs, copied_props;
struct drm_atomic_state *state;
struct drm_modeset_acquire_ctx ctx;
struct drm_plane *plane;
struct drm_out_fence_state *fence_state;
unsigned plane_mask;
int ret = 0;
unsigned int i, j, num_fences;
@@ -2340,7 +2304,6 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
retry:
plane_mask = 0;
copied_objs = 0;
copied_props = 0;
fence_state = NULL;
@@ -2411,12 +2374,6 @@ retry:
copied_props++;
}
if (obj->type == DRM_MODE_OBJECT_PLANE && count_props &&
!(arg->flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
plane = obj_to_plane(obj);
plane_mask |= (1 << drm_plane_index(plane));
plane->old_fb = plane->fb;
}
drm_mode_object_put(obj);
}
@@ -2437,8 +2394,6 @@ retry:
}
out:
drm_atomic_clean_old_fb(dev, plane_mask, ret);
complete_crtc_signaling(dev, state, fence_state, num_fences, !ret);
if (ret == -EDEADLK) {