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drm/atomic: atomic_check functions

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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@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Rob Clark 2014-12-18 16:01:51 -05:00 committed by Daniel Vetter
parent 88a48e297b
commit 5e74373742
2 changed files with 137 additions and 6 deletions
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139
drivers/gpu/drm/drm_atomic.c
View File

@ -268,6 +268,29 @@ 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
@ -375,6 +398,82 @@ 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
@ -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);

4
drivers/gpu/drm/drm_atomic_helper.c
View File

@ -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;
}