[PATCH 06/11] drm/atomic: atomic_check functions
Rob Clark
robdclark at gmail.com
Thu Dec 18 13:01:51 PST 2014
Add functions to check core plane/crtc state.
v2: comments, int-overflow checks, call from core rather than
helpers to be sure drivers can't find a way to bypass core
checks
Signed-off-by: Rob Clark <robdclark at gmail.com>
Reviewed-by: Sean Paul <seanpaul at chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/drm_atomic.c | 139 ++++++++++++++++++++++++++++++++++--
drivers/gpu/drm/drm_atomic_helper.c | 4 +-
2 files changed, 137 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index ce3c681..1c472b1 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -269,6 +269,29 @@ int drm_atomic_crtc_get_property(struct drm_crtc *crtc,
EXPORT_SYMBOL(drm_atomic_crtc_get_property);
/**
+ * drm_atomic_crtc_check - check crtc state
+ * @crtc: crtc to check
+ * @state: crtc state to check
+ *
+ * Provides core sanity checks for crtc state.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure
+ */
+static int drm_atomic_crtc_check(struct drm_crtc *crtc,
+ struct drm_crtc_state *state)
+{
+ /* NOTE: we explicitly don't enforce constraints such as primary
+ * layer covering entire screen, since that is something we want
+ * to allow (on hw that supports it). For hw that does not, it
+ * should be checked in driver's crtc->atomic_check() vfunc.
+ *
+ * TODO: Add generic modeset state checks once we support those.
+ */
+ return 0;
+}
+
+/**
* drm_atomic_get_plane_state - get plane state
* @state: global atomic state object
* @plane: plane to get state object for
@@ -376,6 +399,82 @@ int drm_atomic_plane_get_property(struct drm_plane *plane,
EXPORT_SYMBOL(drm_atomic_plane_get_property);
/**
+ * drm_atomic_plane_check - check plane state
+ * @plane: plane to check
+ * @state: plane state to check
+ *
+ * Provides core sanity checks for plane state.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure
+ */
+static int drm_atomic_plane_check(struct drm_plane *plane,
+ struct drm_plane_state *state)
+{
+ unsigned int fb_width, fb_height;
+ unsigned int i;
+
+ /* either *both* CRTC and FB must be set, or neither */
+ if (WARN_ON(state->crtc && !state->fb)) {
+ DRM_DEBUG_KMS("CRTC set but no FB\n");
+ return -EINVAL;
+ } else if (WARN_ON(state->fb && !state->crtc)) {
+ DRM_DEBUG_KMS("FB set but no CRTC\n");
+ return -EINVAL;
+ }
+
+ /* if disabled, we don't care about the rest of the state: */
+ if (!state->crtc)
+ return 0;
+
+ /* Check whether this plane is usable on this CRTC */
+ if (!(plane->possible_crtcs & drm_crtc_mask(state->crtc))) {
+ DRM_DEBUG_KMS("Invalid crtc for plane\n");
+ return -EINVAL;
+ }
+
+ /* Check whether this plane supports the fb pixel format. */
+ for (i = 0; i < plane->format_count; i++)
+ if (state->fb->pixel_format == plane->format_types[i])
+ break;
+ if (i == plane->format_count) {
+ DRM_DEBUG_KMS("Invalid pixel format %s\n",
+ drm_get_format_name(state->fb->pixel_format));
+ return -EINVAL;
+ }
+
+ /* Give drivers some help against integer overflows */
+ if (state->crtc_w > INT_MAX ||
+ state->crtc_x > INT_MAX - (int32_t) state->crtc_w ||
+ state->crtc_h > INT_MAX ||
+ state->crtc_y > INT_MAX - (int32_t) state->crtc_h) {
+ DRM_DEBUG_KMS("Invalid CRTC coordinates %ux%u+%d+%d\n",
+ state->crtc_w, state->crtc_h,
+ state->crtc_x, state->crtc_y);
+ return -ERANGE;
+ }
+
+ fb_width = state->fb->width << 16;
+ fb_height = state->fb->height << 16;
+
+ /* Make sure source coordinates are inside the fb. */
+ if (state->src_w > fb_width ||
+ state->src_x > fb_width - state->src_w ||
+ state->src_h > fb_height ||
+ state->src_y > fb_height - state->src_h) {
+ DRM_DEBUG_KMS("Invalid source coordinates "
+ "%u.%06ux%u.%06u+%u.%06u+%u.%06u\n",
+ state->src_w >> 16, ((state->src_w & 0xffff) * 15625) >> 10,
+ state->src_h >> 16, ((state->src_h & 0xffff) * 15625) >> 10,
+ state->src_x >> 16, ((state->src_x & 0xffff) * 15625) >> 10,
+ state->src_y >> 16, ((state->src_y & 0xffff) * 15625) >> 10);
+ return -ENOSPC;
+ }
+
+ return 0;
+}
+
+/**
* drm_atomic_get_connector_state - get connector state
* @state: global atomic state object
* @connector: connector to get state object for
@@ -801,14 +900,46 @@ EXPORT_SYMBOL(drm_atomic_legacy_backoff);
*/
int drm_atomic_check_only(struct drm_atomic_state *state)
{
- struct drm_mode_config *config = &state->dev->mode_config;
+ struct drm_device *dev = state->dev;
+ struct drm_mode_config *config = &dev->mode_config;
+ int nplanes = config->num_total_plane;
+ int ncrtcs = config->num_crtc;
+ int i, ret = 0;
DRM_DEBUG_KMS("checking %p\n", state);
+ for (i = 0; i < nplanes; i++) {
+ struct drm_plane *plane = state->planes[i];
+
+ if (!plane)
+ continue;
+
+ ret = drm_atomic_plane_check(plane, state->plane_states[i]);
+ if (ret) {
+ DRM_DEBUG_KMS("[PLANE:%d] atomic core check failed\n",
+ plane->base.id);
+ return ret;
+ }
+ }
+
+ for (i = 0; i < ncrtcs; i++) {
+ struct drm_crtc *crtc = state->crtcs[i];
+
+ if (!crtc)
+ continue;
+
+ ret = drm_atomic_crtc_check(crtc, state->crtc_states[i]);
+ if (ret) {
+ DRM_DEBUG_KMS("[CRTC:%d] atomic core check failed\n",
+ crtc->base.id);
+ return ret;
+ }
+ }
+
if (config->funcs->atomic_check)
- return config->funcs->atomic_check(state->dev, state);
- else
- return 0;
+ ret = config->funcs->atomic_check(state->dev, state);
+
+ return ret;
}
EXPORT_SYMBOL(drm_atomic_check_only);
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 57e5540..541ba83 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -467,7 +467,7 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
ret = funcs->atomic_check(plane, plane_state);
if (ret) {
- DRM_DEBUG_KMS("[PLANE:%d] atomic check failed\n",
+ DRM_DEBUG_KMS("[PLANE:%d] atomic driver check failed\n",
plane->base.id);
return ret;
}
@@ -487,7 +487,7 @@ drm_atomic_helper_check_planes(struct drm_device *dev,
ret = funcs->atomic_check(crtc, state->crtc_states[i]);
if (ret) {
- DRM_DEBUG_KMS("[CRTC:%d] atomic check failed\n",
+ DRM_DEBUG_KMS("[CRTC:%d] atomic driver check failed\n",
crtc->base.id);
return ret;
}
--
2.1.0
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