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>
27#include <drm/drm_lease.h>
28struct drm_object_properties;
29struct drm_property;
30struct drm_device;
31struct drm_file;
32
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
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.
54 */
55struct 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
63#define DRM_OBJECT_MAX_PROPERTY 24
64/**
65 * struct drm_object_properties - property tracking for &drm_mode_object
66 */
67struct drm_object_properties {
68	/**
69	 * @count: number of valid properties, must be less than or equal to
70	 * DRM_OBJECT_MAX_PROPERTY.
71	 */
72
73	int count;
74	/**
75	 * @properties: Array of pointers to &drm_property.
76	 *
77	 * NOTE: if we ever start dynamically destroying properties (ie.
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];
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
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
100	 * without the DRM_MODE_PROP_IMMUTABLE flag set.
101	 *
102	 * For atomic drivers the default value of properties is stored in this
103	 * array, so drm_object_property_get_default_value can be used to
104	 * retrieve it.
105	 */
106	uint64_t values[DRM_OBJECT_MAX_PROPERTY];
107};
108
109/* Avoid boilerplate.  I'm tired of typing. */
110#define DRM_ENUM_NAME_FN(fnname, list)				\
111	const char *fnname(int val)				\
112	{							\
113		int i;						\
114		for (i = 0; i < ARRAY_SIZE(list); i++) {	\
115			if (list[i].type == val)		\
116				return list[i].name;		\
117		}						\
118		return "(unknown)";				\
119	}
120
121struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
122					     struct drm_file *file_priv,
123					     uint32_t id, uint32_t type);
124void drm_mode_object_get(struct drm_mode_object *obj);
125void drm_mode_object_put(struct drm_mode_object *obj);
126
127int drm_object_property_set_value(struct drm_mode_object *obj,
128				  struct drm_property *property,
129				  uint64_t val);
130int drm_object_property_get_value(struct drm_mode_object *obj,
131				  struct drm_property *property,
132				  uint64_t *value);
133int drm_object_property_get_default_value(struct drm_mode_object *obj,
134					  struct drm_property *property,
135					  uint64_t *val);
136
137void drm_object_attach_property(struct drm_mode_object *obj,
138				struct drm_property *property,
139				uint64_t init_val);
140
141bool drm_mode_object_lease_required(uint32_t type);
142#endif
143