[mirror_ubuntu-bionic-kernel.git] / include / drm / drm_mode_object.h

/*
 * 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>
#include <drm/drm_lease.h>
struct drm_object_properties;
struct drm_property;
struct drm_device;
struct drm_file;

/**
 * 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_get() and
 *   drm_mode_object_put(). 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,
					     struct drm_file *file_priv,
					     uint32_t id, uint32_t type);
void drm_mode_object_get(struct drm_mode_object *obj);
void drm_mode_object_put(struct drm_mode_object *obj);

/**
 * drm_mode_object_reference - acquire a mode object reference
 * @obj: DRM mode object
 *
 * This is a compatibility alias for drm_mode_object_get() and should not be
 * used by new code.
 */
static inline void drm_mode_object_reference(struct drm_mode_object *obj)
{
	drm_mode_object_get(obj);
}

/**
 * drm_mode_object_unreference - release a mode object reference
 * @obj: DRM mode object
 *
 * This is a compatibility alias for drm_mode_object_put() and should not be
 * used by new code.
 */
static inline void drm_mode_object_unreference(struct drm_mode_object *obj)
{
	drm_mode_object_put(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);

bool drm_mode_object_lease_required(uint32_t type);
#endif
Commit	Line	Data
7520a277 DV	1	/*
	2	* Copyright (c) 2016 Intel Corporation
	3	*
	4	* Permission to use, copy, modify, distribute, and sell this software and its
	5	* documentation for any purpose is hereby granted without fee, provided that
	6	* the above copyright notice appear in all copies and that both that copyright
	7	* notice and this permission notice appear in supporting documentation, and
	8	* that the name of the copyright holders not be used in advertising or
	9	* publicity pertaining to distribution of the software without specific,
	10	* written prior permission. The copyright holders make no representations
	11	* about the suitability of this software for any purpose. It is provided "as
	12	* is" without express or implied warranty.
	13	*
	14	* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	15	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	16	* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	17	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
	18	* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
	19	* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
	20	* OF THIS SOFTWARE.
	21	*/
	22
	23	#ifndef __DRM_MODESET_H__
	24	#define __DRM_MODESET_H__
	25
	26	#include <linux/kref.h>
2ed077e4	27	#include <drm/drm_lease.h>
7520a277	28	struct drm_object_properties;
52217195	29	struct drm_property;
199e4e96	30	struct drm_device;
418da172	31	struct drm_file;
7520a277	32
a2511a55 DV	33	/**
	34	* struct drm_mode_object - base structure for modeset objects
	35	* @id: userspace visible identifier
	36	* @type: type of the object, one of DRM_MODE_OBJECT\_\*
	37	* @properties: properties attached to this object, including values
	38	* @refcount: reference count for objects which with dynamic lifetime
	39	* @free_cb: free function callback, only set for objects with dynamic lifetime
	40	*
	41	* Base structure for modeset objects visible to userspace. Objects can be
	42	* looked up using drm_mode_object_find(). Besides basic uapi interface
	43	* properties like @id and @type it provides two services:
	44	*
	45	* - It tracks attached properties and their values. This is used by &drm_crtc,
	46	* &drm_plane and &drm_connector. Properties are attached by calling
	47	* drm_object_attach_property() before the object is visible to userspace.
	48	*
	49	* - For objects with dynamic lifetimes (as indicated by a non-NULL @free_cb) it
020a218f TR	50	* provides reference counting through drm_mode_object_get() and
	51	* drm_mode_object_put(). This is used by &drm_framebuffer, &drm_connector
	52	* and &drm_property_blob. These objects provide specialized reference
	53	* counting wrappers.
a2511a55	54	*/
7520a277 DV	55	struct drm_mode_object {
	56	uint32_t id;
	57	uint32_t type;
	58	struct drm_object_properties *properties;
	59	struct kref refcount;
	60	void (free_cb)(struct kref kref);
	61	};
	62
52217195	63	#define DRM_OBJECT_MAX_PROPERTY 24
a2511a55 DV	64	/**
	65	* struct drm_object_properties - property tracking for &drm_mode_object
	66	*/
52217195	67	struct drm_object_properties {
a2511a55 DV	68	/**
	69	* @count: number of valid properties, must be less than or equal to
	70	* DRM_OBJECT_MAX_PROPERTY.
	71	*/
	72
f094d881	73	int count;
a2511a55 DV	74	/**
	75	* @properties: Array of pointers to &drm_property.
	76	*
	77	* NOTE: if we ever start dynamically destroying properties (ie.
52217195 DV	78	* not at drm_mode_config_cleanup() time), then we'd have to do
	79	* a better job of detaching property from mode objects to avoid
	80	* dangling property pointers:
	81	*/
	82	struct drm_property *properties[DRM_OBJECT_MAX_PROPERTY];
a2511a55 DV	83
	84	/**
	85	* @values: Array to store the property values, matching @properties. Do
	86	* not read/write values directly, but use
	87	* drm_object_property_get_value() and drm_object_property_set_value().
	88	*
	89	* Note that atomic drivers do not store mutable properties in this
	90	* array, but only the decoded values in the corresponding state
d574528a DV	91	* structure. The decoding is done using the &drm_crtc.atomic_get_property and
	92	* &drm_crtc.atomic_set_property hooks for &struct drm_crtc. For
	93	* &struct drm_plane the hooks are &drm_plane_funcs.atomic_get_property and
	94	* &drm_plane_funcs.atomic_set_property. And for &struct drm_connector
	95	* the hooks are &drm_connector_funcs.atomic_get_property and
	96	* &drm_connector_funcs.atomic_set_property .
	97	*
	98	* Hence atomic drivers should not use drm_object_property_set_value()
	99	* and drm_object_property_get_value() on mutable objects, i.e. those
a2511a55	100	* without the DRM_MODE_PROP_IMMUTABLE flag set.
52217195 DV	101	*/
	102	uint64_t values[DRM_OBJECT_MAX_PROPERTY];
	103	};
	104
	105	/* Avoid boilerplate. I'm tired of typing. */
	106	#define DRM_ENUM_NAME_FN(fnname, list) \
	107	const char *fnname(int val) \
	108	{ \
	109	int i; \
	110	for (i = 0; i < ARRAY_SIZE(list); i++) { \
	111	if (list[i].type == val) \
	112	return list[i].name; \
	113	} \
	114	return "(unknown)"; \
	115	}
	116
7520a277	117	struct drm_mode_object drm_mode_object_find(struct drm_device dev,
418da172	118	struct drm_file *file_priv,
7520a277	119	uint32_t id, uint32_t type);
020a218f TR	120	void drm_mode_object_get(struct drm_mode_object *obj);
	121	void drm_mode_object_put(struct drm_mode_object *obj);
	122
	123	/**
	124	* drm_mode_object_reference - acquire a mode object reference
	125	* @obj: DRM mode object
	126	*
	127	* This is a compatibility alias for drm_mode_object_get() and should not be
	128	* used by new code.
	129	*/
	130	static inline void drm_mode_object_reference(struct drm_mode_object *obj)
	131	{
	132	drm_mode_object_get(obj);
	133	}
	134
	135	/**
	136	* drm_mode_object_unreference - release a mode object reference
	137	* @obj: DRM mode object
	138	*
	139	* This is a compatibility alias for drm_mode_object_put() and should not be
	140	* used by new code.
	141	*/
	142	static inline void drm_mode_object_unreference(struct drm_mode_object *obj)
	143	{
	144	drm_mode_object_put(obj);
	145	}
7520a277	146
949619f3 DV	147	int drm_object_property_set_value(struct drm_mode_object *obj,
	148	struct drm_property *property,
	149	uint64_t val);
	150	int drm_object_property_get_value(struct drm_mode_object *obj,
	151	struct drm_property *property,
	152	uint64_t *value);
	153
	154	void drm_object_attach_property(struct drm_mode_object *obj,
	155	struct drm_property *property,
	156	uint64_t init_val);
62884cd3 KP	157
62884cd3 KP	158	bool drm_mode_object_lease_required(uint32_t type);
7520a277	159	#endif