[PATCH v10 08/11] drm: Handle aspect ratio info in legacy and atomic modeset paths

["Nautiyal, Ankit K" <ankit.k.nautiyal@intel.com>]

From: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

If the user-space does not support aspect-ratio, and requests for a
modeset with mode having aspect ratio bits set, then the given
user-mode must be rejected. Secondly, while preparing a user-mode from
kernel mode, the aspect-ratio info must not be given, if aspect-ratio
is not supported by the user.

Note: In case, a user-space asks for a video-mode blob, from the
getblob ioctl, the aspect-ratio bits in the video-mode blob are passed
to the user as it is, without any filtering. However, no such case is
present in most of the atomic user-spaces. Currently atomic path of
Xserver, Wayland/weston, Hardware-Composer are checked, and none of
them are using getblob ioctl to get the video-mode blob.

This patch:
1. passes the file_priv structure from the drm_mode_atomic_ioctl till
   the drm_mode_crtc_set_mode_prop, to get the user capability.
2. rejects the modes with aspect-ratio info, during modeset, if the
   user does not support aspect ratio.
3. does not load the aspect-ratio info in user-mode structure, if
   aspect ratio is not supported.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

V3: Addressed review comments from Ville:
    Do not corrupt the current crtc state by updating aspect-ratio on
    the fly.
V4: rebase
V5: As suggested by Ville, rejected the modeset calls for modes with
    aspect ratio, if the user does not set aspect-ratio cap.
V6: Used the helper functions for determining if aspect-ratio is
    expected in the user-mode.
V7: rebase
V8: rebase
V9: rebase
v10: Modified the commit-message
---
 drivers/gpu/drm/drm_atomic.c        | 34 +++++++++++++++++++++++++---------
 drivers/gpu/drm/drm_atomic_helper.c |  6 +++---
 drivers/gpu/drm/drm_crtc.c          |  8 ++++++++
 drivers/gpu/drm/drm_crtc_internal.h |  3 ++-
 drivers/gpu/drm/drm_mode_object.c   |  9 ++++++---
 include/drm/drm_atomic.h            |  5 +++--
 6 files changed, 47 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 7d25c42..5863072 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -368,6 +368,7 @@ EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
  * drm_atomic_set_mode_prop_for_crtc - set mode for CRTC
  * @state: the CRTC whose incoming state to update
  * @blob: pointer to blob property to use for mode
+ * @file_priv: file priv structure, to get the userspace capabilities
  *
  * Set a mode (originating from a blob property) on the desired CRTC state.
  * This function will take a reference on the blob property for the CRTC state,
@@ -378,7 +379,8 @@ EXPORT_SYMBOL(drm_atomic_set_mode_for_crtc);
  * Zero on success, error code on failure. Cannot return -EDEADLK.
  */
 int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
-                                      struct drm_property_blob *blob)
+				      struct drm_property_blob *blob,
+				      struct drm_file *file_priv)
 {
 	if (blob == state->mode_blob)
 		return 0;
@@ -389,9 +391,21 @@ int drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
 	memset(&state->mode, 0, sizeof(state->mode));
 
 	if (blob) {
-		if (blob->length != sizeof(struct drm_mode_modeinfo) ||
-		    drm_mode_convert_umode(state->crtc->dev, &state->mode,
-					   blob->data))
+		struct drm_mode_modeinfo *u_mode;
+
+		if (blob->length != sizeof(struct drm_mode_modeinfo))
+			return -EINVAL;
+
+		u_mode = (struct drm_mode_modeinfo *) blob->data;
+		if (!drm_mode_aspect_ratio_allowed(file_priv,
+						   u_mode)) {
+			DRM_DEBUG_ATOMIC("Unexpected aspect-ratio flag bits\n");
+			return -EINVAL;
+		}
+
+		if (drm_mode_convert_umode(state->crtc->dev, &state->mode,
+					   (const struct drm_mode_modeinfo *)
+					   u_mode))
 			return -EINVAL;
 
 		state->mode_blob = drm_property_blob_get(blob);
@@ -471,6 +485,7 @@ drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
  * @state: the state object to update with the new property value
  * @property: the property to set
  * @val: the new property value
+ * @file_priv: the file private structure, to get the user capabilities
  *
  * This function handles generic/core properties and calls out to driver's
  * &drm_crtc_funcs.atomic_set_property for driver properties. To ensure
@@ -482,7 +497,7 @@ drm_atomic_replace_property_blob_from_id(struct drm_device *dev,
  */
 int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 		struct drm_crtc_state *state, struct drm_property *property,
-		uint64_t val)
+		uint64_t val, struct drm_file *file_priv)
 {
 	struct drm_device *dev = crtc->dev;
 	struct drm_mode_config *config = &dev->mode_config;
@@ -494,7 +509,7 @@ int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 	else if (property == config->prop_mode_id) {
 		struct drm_property_blob *mode =
 			drm_property_lookup_blob(dev, val);
-		ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
+		ret = drm_atomic_set_mode_prop_for_crtc(state, mode, file_priv);
 		drm_property_blob_put(mode);
 		return ret;
 	} else if (property == config->degamma_lut_property) {
@@ -1961,7 +1976,8 @@ int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 int drm_atomic_set_property(struct drm_atomic_state *state,
 			    struct drm_mode_object *obj,
 			    struct drm_property *prop,
-			    uint64_t prop_value)
+			    uint64_t prop_value,
+			    struct drm_file *file_priv)
 {
 	struct drm_mode_object *ref;
 	int ret;
@@ -1995,7 +2011,7 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
 		}
 
 		ret = drm_atomic_crtc_set_property(crtc,
-				crtc_state, prop, prop_value);
+				crtc_state, prop, prop_value, file_priv);
 		break;
 	}
 	case DRM_MODE_OBJECT_PLANE: {
@@ -2384,7 +2400,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
 			}
 
 			ret = drm_atomic_set_property(state, obj, prop,
-						      prop_value);
+						      prop_value, file_priv);
 			if (ret) {
 				drm_mode_object_put(obj);
 				goto out;
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index ee03c1e..b75343b 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -186,7 +186,7 @@ static int handle_conflicting_encoders(struct drm_atomic_state *state,
 
 		if (!crtc_state->connector_mask) {
 			ret = drm_atomic_set_mode_prop_for_crtc(crtc_state,
-								NULL);
+								NULL, NULL);
 			if (ret < 0)
 				goto out;
 
@@ -2762,7 +2762,7 @@ static int update_output_state(struct drm_atomic_state *state,
 
 		if (!new_crtc_state->connector_mask) {
 			ret = drm_atomic_set_mode_prop_for_crtc(new_crtc_state,
-								NULL);
+								NULL, NULL);
 			if (ret < 0)
 				return ret;
 
@@ -2921,7 +2921,7 @@ static int __drm_atomic_helper_disable_all(struct drm_device *dev,
 
 		crtc_state->active = false;
 
-		ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL);
+		ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL, NULL);
 		if (ret < 0)
 			goto free;
 
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index a231dd5..98323f4 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -449,6 +449,7 @@ int drm_mode_getcrtc(struct drm_device *dev,
 			crtc_resp->mode_valid = 0;
 		}
 	}
+	drm_mode_filter_aspect_ratio_flags(file_priv, &crtc_resp->mode);
 	drm_modeset_unlock(&crtc->mutex);
 
 	return 0;
@@ -628,6 +629,13 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 			ret = -ENOMEM;
 			goto out;
 		}
+		if (!drm_mode_aspect_ratio_allowed(file_priv,
+						   &crtc_req->mode)) {
+			DRM_DEBUG_KMS("Unexpected aspect-ratio flag bits\n");
+			ret = -EINVAL;
+			goto out;
+		}
+
 
 		ret = drm_mode_convert_umode(dev, mode, &crtc_req->mode);
 		if (ret) {
diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index 3c2b828..7e9f8f8 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -188,7 +188,8 @@ int drm_atomic_connector_commit_dpms(struct drm_atomic_state *state,
 int drm_atomic_set_property(struct drm_atomic_state *state,
 			    struct drm_mode_object *obj,
 			    struct drm_property *prop,
-			    uint64_t prop_value);
+			    uint64_t prop_value,
+			    struct drm_file *file_priv);
 int drm_atomic_get_property(struct drm_mode_object *obj,
 			    struct drm_property *property, uint64_t *val);
 int drm_mode_atomic_ioctl(struct drm_device *dev,
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index ce4d2fb..1c3d498 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -452,7 +452,8 @@ static int set_property_legacy(struct drm_mode_object *obj,
 
 static int set_property_atomic(struct drm_mode_object *obj,
 			       struct drm_property *prop,
-			       uint64_t prop_value)
+			       uint64_t prop_value,
+			       struct drm_file *file_priv)
 {
 	struct drm_device *dev = prop->dev;
 	struct drm_atomic_state *state;
@@ -476,7 +477,8 @@ static int set_property_atomic(struct drm_mode_object *obj,
 						       obj_to_connector(obj),
 						       prop_value);
 	} else {
-		ret = drm_atomic_set_property(state, obj, prop, prop_value);
+		ret = drm_atomic_set_property(state, obj, prop, prop_value,
+					      file_priv);
 		if (ret)
 			goto out;
 		ret = drm_atomic_commit(state);
@@ -519,7 +521,8 @@ int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
 		goto out_unref;
 
 	if (drm_drv_uses_atomic_modeset(property->dev))
-		ret = set_property_atomic(arg_obj, property, arg->value);
+		ret = set_property_atomic(arg_obj, property, arg->value,
+					  file_priv);
 	else
 		ret = set_property_legacy(arg_obj, property, arg->value);
 
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index a57a8aa..b7106f7 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -367,7 +367,7 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 			  struct drm_crtc *crtc);
 int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 		struct drm_crtc_state *state, struct drm_property *property,
-		uint64_t val);
+		uint64_t val, struct drm_file *file_priv);
 struct drm_plane_state * __must_check
 drm_atomic_get_plane_state(struct drm_atomic_state *state,
 			   struct drm_plane *plane);
@@ -583,7 +583,8 @@ drm_atomic_set_mode_for_crtc(struct drm_crtc_state *state,
 			     const struct drm_display_mode *mode);
 int __must_check
 drm_atomic_set_mode_prop_for_crtc(struct drm_crtc_state *state,
-				  struct drm_property_blob *blob);
+				  struct drm_property_blob *blob,
+				  struct drm_file *file_priv);
 int __must_check
 drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
 			      struct drm_crtc *crtc);
-- 
2.7.4

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