From: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
If the user-space does not support aspect-ratio, then getblob called
with the blob id of a user-mode, should clear the aspect-ratio
information in the blob data.
Currently for a given blob id, there is no way to determine if the
blob stores user-mode or not. This can only be ascertained when the
blob is used for an atomic modeset call.
This patch:
-adds a new field 'is_video_mode' in drm_property_blob to
differentiate between the video mode blobs and the other blobs.
-sets the field 'is_video_mode' when the blob is used for modeset.
-removes the aspect-ratio info from the user-mode data if aspect-ratio
is not supported by the user, while returning the blob to the user,
in getblob ioctl.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
V6: As suggested by Ville:
-added helper functions for determining if aspect-ratio is
expected in user-mode and for allowing/disallowing the
aspect-ratio, if its not expected.
-avoided clobbering of blob-data, instead cleared the aspect-ratio
in the user-mode only, so that another client with aspect-ratio
cap, can still get the aspect-ratio information from getblob.
---
drivers/gpu/drm/drm_atomic.c | 1 +
drivers/gpu/drm/drm_modes.c | 44 ++++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_property.c | 5 +++++
include/drm/drm_modes.h | 4 ++++
include/drm/drm_property.h | 2 ++
5 files changed, 56 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 46733d5..86b483e 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -464,6 +464,7 @@ 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);
+ mode->is_video_mode = true;
ret = drm_atomic_set_mode_prop_for_crtc(state, mode);
drm_property_blob_put(mode);
return ret;
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index a48672c..219890f 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1761,3 +1761,47 @@ bool drm_mode_is_420(const struct drm_display_info *display,
drm_mode_is_420_also(display, mode);
}
EXPORT_SYMBOL(drm_mode_is_420);
+
+/**
+ * drm_mode_aspect_ratio_allowed - checks if the aspect-ratio information
+ * is expected from the user-mode.
+ *
+ * If the user has set aspect-ratio cap, then the flag of the user-mode is
+ * allowed to contain aspect-ratio value.
+ * If the user does not set aspect-ratio cap, then the only value allowed in the
+ * flags bits is aspect-ratio NONE.
+ *
+ * @file_priv: file private structure to get the user capabilities
+ * @flag: 32 bit flag that contains the aspect-ratio information.
+ *
+ * Returns:
+ * true if the aspect-ratio info is allowed in the user-mode flags.
+ * false, otherwise.
+ */
+bool
+drm_mode_aspect_ratio_allowed(const struct drm_file *file_priv, uint32_t flags)
+{
+ return file_priv->aspect_ratio_allowed ||
+ (flags & DRM_MODE_FLAG_PIC_AR_MASK) == DRM_MODE_FLAG_PIC_AR_NONE;
+}
+EXPORT_SYMBOL(drm_mode_aspect_ratio_allowed);
+
+/**
+ * drm_mode_handle_aspect_ratio - handles the aspect-ratio bits in the user-mode
+ * flags.
+ *
+ * Checks if the aspect-ratio information is allowed. Resets the aspect-ratio
+ * bits in the user-mode flag, if aspect-ratio info is not allowed.
+ *
+ * @file_priv: file private structure to get the user capabilities.
+ * @flag: 32 bit flag that is to be modified, in case the aspect
+ * ratio info is not allowed.
+ *
+ */
+void
+drm_mode_handle_aspect_ratio(const struct drm_file *file_priv, uint32_t *flags)
+{
+ if (!drm_mode_aspect_ratio_allowed(file_priv, *flags))
+ *flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
+}
+EXPORT_SYMBOL(drm_mode_handle_aspect_ratio);
diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
index bae50e6..4e56f84 100644
--- a/drivers/gpu/drm/drm_property.c
+++ b/drivers/gpu/drm/drm_property.c
@@ -753,6 +753,11 @@ int drm_mode_getblob_ioctl(struct drm_device *dev,
ret = -EFAULT;
goto unref;
}
+ if (blob->is_video_mode) {
+ struct drm_mode_modeinfo *mode =
+ (struct drm_mode_modeinfo *) out_resp->data;
+ drm_mode_handle_aspect_ratio(file_priv, &mode->flags);
+ }
}
out_resp->length = blob->length;
unref:
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 2f78b7e..51d1188 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -461,6 +461,10 @@ bool drm_mode_is_420_also(const struct drm_display_info *display,
const struct drm_display_mode *mode);
bool drm_mode_is_420(const struct drm_display_info *display,
const struct drm_display_mode *mode);
+bool drm_mode_aspect_ratio_allowed(const struct drm_file *file_priv,
+ uint32_t flags);
+void drm_mode_handle_aspect_ratio(const struct drm_file *file_priv,
+ uint32_t *flags);
struct drm_display_mode *drm_cvt_mode(struct drm_device *dev,
int hdisplay, int vdisplay, int vrefresh,
diff --git a/include/drm/drm_property.h b/include/drm/drm_property.h
index 8a522b4..95e6e32 100644
--- a/include/drm/drm_property.h
+++ b/include/drm/drm_property.h
@@ -194,6 +194,7 @@ struct drm_property {
* @head_global: entry on the global blob list in
* &drm_mode_config.property_blob_list.
* @head_file: entry on the per-file blob list in &drm_file.blobs list.
+ * @is_video_mode: flag to mark the blobs that contain drm_mode_modeinfo.
* @length: size of the blob in bytes, invariant over the lifetime of the object
* @data: actual data, embedded at the end of this structure
*
@@ -208,6 +209,7 @@ struct drm_property_blob {
struct drm_device *dev;
struct list_head head_global;
struct list_head head_file;
+ bool is_video_mode;
size_t length;
unsigned char data[];
};
--
2.7.4
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