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drm_mode_object.h
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/*
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef __DRM_MODESET_H__
#define __DRM_MODESET_H__
#include <linux/kref.h>
struct drm_object_properties;
struct drm_property;
struct drm_device;
/**
* struct drm_mode_object - base structure for modeset objects
* @id: userspace visible identifier
* @type: type of the object, one of DRM_MODE_OBJECT\_\*
* @properties: properties attached to this object, including values
* @refcount: reference count for objects which with dynamic lifetime
* @free_cb: free function callback, only set for objects with dynamic lifetime
*
* Base structure for modeset objects visible to userspace. Objects can be
* looked up using drm_mode_object_find(). Besides basic uapi interface
* properties like @id and @type it provides two services:
*
* - It tracks attached properties and their values. This is used by &drm_crtc,
* &drm_plane and &drm_connector. Properties are attached by calling
* drm_object_attach_property() before the object is visible to userspace.
*
* - For objects with dynamic lifetimes (as indicated by a non-NULL @free_cb) it
* provides reference counting through drm_mode_object_reference() and
* drm_mode_object_unreference(). This is used by &drm_framebuffer,
* &drm_connector and &drm_property_blob. These objects provide specialized
* reference counting wrappers.
*/
struct drm_mode_object {
uint32_t id;
uint32_t type;
struct drm_object_properties *properties;
struct kref refcount;
void (*free_cb)(struct kref *kref);
};
#define DRM_OBJECT_MAX_PROPERTY 24
/**
* struct drm_object_properties - property tracking for &drm_mode_object
*/
struct drm_object_properties {
/**
* @count: number of valid properties, must be less than or equal to
* DRM_OBJECT_MAX_PROPERTY.
*/
int count;
/**
* @properties: Array of pointers to &drm_property.
*
* NOTE: if we ever start dynamically destroying properties (ie.
* not at drm_mode_config_cleanup() time), then we'd have to do
* a better job of detaching property from mode objects to avoid
* dangling property pointers:
*/
struct drm_property *properties[DRM_OBJECT_MAX_PROPERTY];
/**
* @values: Array to store the property values, matching @properties. Do
* not read/write values directly, but use
* drm_object_property_get_value() and drm_object_property_set_value().
*
* Note that atomic drivers do not store mutable properties in this
* array, but only the decoded values in the corresponding state
* structure. The decoding is done using the &drm_crtc.atomic_get_property and
* &drm_crtc.atomic_set_property hooks for &struct drm_crtc. For
* &struct drm_plane the hooks are &drm_plane_funcs.atomic_get_property and
* &drm_plane_funcs.atomic_set_property. And for &struct drm_connector
* the hooks are &drm_connector_funcs.atomic_get_property and
* &drm_connector_funcs.atomic_set_property .
*
* Hence atomic drivers should not use drm_object_property_set_value()
* and drm_object_property_get_value() on mutable objects, i.e. those
* without the DRM_MODE_PROP_IMMUTABLE flag set.
*/
uint64_t values[DRM_OBJECT_MAX_PROPERTY];
};
/* Avoid boilerplate. I'm tired of typing. */
#define DRM_ENUM_NAME_FN(fnname, list) \
const char *fnname(int val) \
{ \
int i; \
for (i = 0; i < ARRAY_SIZE(list); i++) { \
if (list[i].type == val) \
return list[i].name; \
} \
return "(unknown)"; \
}
struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
uint32_t id, uint32_t type);
void drm_mode_object_reference(struct drm_mode_object *obj);
void drm_mode_object_unreference(struct drm_mode_object *obj);
int drm_object_property_set_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t val);
int drm_object_property_get_value(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t *value);
void drm_object_attach_property(struct drm_mode_object *obj,
struct drm_property *property,
uint64_t init_val);
#endif