summaryrefslogtreecommitdiffstats
path: root/include/drm/drm_property.h
blob: c030f6ccab99cf469e603e55e550eeb8bc11f2f2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 * 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_PROPERTY_H__
#define __DRM_PROPERTY_H__

#include <linux/list.h>
#include <linux/ctype.h>
#include <drm/drm_mode_object.h>

/**
 * struct drm_property_enum - symbolic values for enumerations
 * @value: numeric property value for this enum entry
 * @head: list of enum values, linked to &drm_property.enum_list
 * @name: symbolic name for the enum
 *
 * For enumeration and bitmask properties this structure stores the symbolic
 * decoding for each value. This is used for example for the rotation property.
 */
struct drm_property_enum {
	uint64_t value;
	struct list_head head;
	char name[DRM_PROP_NAME_LEN];
};

/**
 * struct drm_property - modeset object property
 *
 * This structure represent a modeset object property. It combines both the name
 * of the property with the set of permissible values. This means that when a
 * driver wants to use a property with the same name on different objects, but
 * with different value ranges, then it must create property for each one. An
 * example would be rotation of &drm_plane, when e.g. the primary plane cannot
 * be rotated. But if both the name and the value range match, then the same
 * property structure can be instantiated multiple times for the same object.
 * Userspace must be able to cope with this and cannot assume that the same
 * symbolic property will have the same modeset object ID on all modeset
 * objects.
 *
 * Properties are created by one of the special functions, as explained in
 * detail in the @flags structure member.
 *
 * To actually expose a property it must be attached to each object using
 * drm_object_attach_property(). Currently properties can only be attached to
 * &drm_connector, &drm_crtc and &drm_plane.
 *
 * Properties are also used as the generic metadatatransport for the atomic
 * IOCTL. Everything that was set directly in structures in the legacy modeset
 * IOCTLs (like the plane source or destination windows, or e.g. the links to
 * the CRTC) is exposed as a property with the DRM_MODE_PROP_ATOMIC flag set.
 */
struct drm_property {
	/**
	 * @head: per-device list of properties, for cleanup.
	 */
	struct list_head head;

	/**
	 * @base: base KMS object
	 */
	struct drm_mode_object base;

	/**
	 * @flags:
	 *
	 * Property flags and type. A property needs to be one of the following
	 * types:
	 *
	 * DRM_MODE_PROP_RANGE
	 *     Range properties report their minimum and maximum admissible unsigned values.
	 *     The KMS core verifies that values set by application fit in that
	 *     range. The range is unsigned. Range properties are created using
	 *     drm_property_create_range().
	 *
	 * DRM_MODE_PROP_SIGNED_RANGE
	 *     Range properties report their minimum and maximum admissible unsigned values.
	 *     The KMS core verifies that values set by application fit in that
	 *     range. The range is signed. Range properties are created using
	 *     drm_property_create_signed_range().
	 *
	 * DRM_MODE_PROP_ENUM
	 *     Enumerated properties take a numerical value that ranges from 0 to
	 *     the number of enumerated values defined by the property minus one,
	 *     and associate a free-formed string name to each value. Applications
	 *     can retrieve the list of defined value-name pairs and use the
	 *     numerical value to get and set property instance values. Enum
	 *     properties are created using drm_property_create_enum().
	 *
	 * DRM_MODE_PROP_BITMASK
	 *     Bitmask properties are enumeration properties that additionally
	 *     restrict all enumerated values to the 0..63 range. Bitmask property
	 *     instance values combine one or more of the enumerated bits defined
	 *     by the property. Bitmask properties are created using
	 *     drm_property_create_bitmask().
	 *
	 * DRM_MODE_PROB_OBJECT
	 *     Object properties are used to link modeset objects. This is used
	 *     extensively in the atomic support to create the display pipeline,
	 *     by linking &drm_framebuffer to &drm_plane, &drm_plane to
	 *     &drm_crtc and &drm_connector to &drm_crtc. An object property can
	 *     only link to a specific type of &drm_mode_object, this limit is
	 *     enforced by the core. Object properties are created using
	 *     drm_property_create_object().
	 *
	 *     Object properties work like blob properties, but in a more
	 *     general fashion. They are limited to atomic drivers and must have
	 *     the DRM_MODE_PROP_ATOMIC flag set.
	 *
	 * DRM_MODE_PROP_BLOB
	 *     Blob properties store a binary blob without any format restriction.
	 *     The binary blobs are created as KMS standalone objects, and blob
	 *     property instance values store the ID of their associated blob
	 *     object. Blob properties are created by calling
	 *     drm_property_create() with DRM_MODE_PROP_BLOB as the type.
	 *
	 *     Actual blob objects to contain blob data are created using
	 *     drm_property_create_blob(), or through the corresponding IOCTL.
	 *
	 *     Besides the built-in limit to only accept blob objects blob
	 *     properties work exactly like object properties. The only reasons
	 *     blob properties exist is backwards compatibility with existing
	 *     userspace.
	 *
	 * In addition a property can have any combination of the below flags:
	 *
	 * DRM_MODE_PROP_ATOMIC
	 *     Set for properties which encode atomic modeset state. Such
	 *     properties are not exposed to legacy userspace.
	 *
	 * DRM_MODE_PROP_IMMUTABLE
	 *     Set for properties whose values cannot be changed by
	 *     userspace. The kernel is allowed to update the value of these
	 *     properties. This is generally used to expose probe state to
	 *     userspace, e.g. the EDID, or the connector path property on DP
	 *     MST sinks.
	 */
	uint32_t flags;

	/**
	 * @name: symbolic name of the properties
	 */
	char name[DRM_PROP_NAME_LEN];

	/**
	 * @num_values: size of the @values array.
	 */
	uint32_t num_values;

	/**
	 * @values:
	 *
	 * Array with limits and values for the property. The
	 * interpretation of these limits is dependent upon the type per @flags.
	 */
	uint64_t *values;

	/**
	 * @dev: DRM device
	 */
	struct drm_device *dev;

	/**
	 * @enum_list:
	 *
	 * List of &drm_prop_enum_list structures with the symbolic names for
	 * enum and bitmask values.
	 */
	struct list_head enum_list;
};

/**
 * struct drm_property_blob - Blob data for &drm_property
 * @base: base KMS object
 * @dev: DRM device
 * @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.
 * @length: size of the blob in bytes, invariant over the lifetime of the object
 * @data: actual data, embedded at the end of this structure
 *
 * Blobs are used to store bigger values than what fits directly into the 64
 * bits available for a &drm_property.
 *
 * Blobs are reference counted using drm_property_blob_get() and
 * drm_property_blob_put(). They are created using drm_property_create_blob().
 */
struct drm_property_blob {
	struct drm_mode_object base;
	struct drm_device *dev;
	struct list_head head_global;
	struct list_head head_file;
	size_t length;
	void *data;
};

struct drm_prop_enum_list {
	int type;
	const char *name;
};

#define obj_to_property(x) container_of(x, struct drm_property, base)
#define obj_to_blob(x) container_of(x, struct drm_property_blob, base)

/**
 * drm_property_type_is - check the type of a property
 * @property: property to check
 * @type: property type to compare with
 *
 * This is a helper function becauase the uapi encoding of property types is
 * a bit special for historical reasons.
 */
static inline bool drm_property_type_is(struct drm_property *property,
					uint32_t type)
{
	/* instanceof for props.. handles extended type vs original types: */
	if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
		return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
	return property->flags & type;
}

struct drm_property *drm_property_create(struct drm_device *dev,
					 u32 flags, const char *name,
					 int num_values);
struct drm_property *drm_property_create_enum(struct drm_device *dev,
					      u32 flags, const char *name,
					      const struct drm_prop_enum_list *props,
					      int num_values);
struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
						 u32 flags, const char *name,
						 const struct drm_prop_enum_list *props,
						 int num_props,
						 uint64_t supported_bits);
struct drm_property *drm_property_create_range(struct drm_device *dev,
					       u32 flags, const char *name,
					       uint64_t min, uint64_t max);
struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
						      u32 flags, const char *name,
						      int64_t min, int64_t max);
struct drm_property *drm_property_create_object(struct drm_device *dev,
						u32 flags, const char *name,
						uint32_t type);
struct drm_property *drm_property_create_bool(struct drm_device *dev,
					      u32 flags, const char *name);
int drm_property_add_enum(struct drm_property *property,
			  uint64_t value, const char *name);
void drm_property_destroy(struct drm_device *dev, struct drm_property *property);

struct drm_property_blob *drm_property_create_blob(struct drm_device *dev,
						   size_t length,
						   const void *data);
struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
						   uint32_t id);
int drm_property_replace_global_blob(struct drm_device *dev,
				     struct drm_property_blob **replace,
				     size_t length,
				     const void *data,
				     struct drm_mode_object *obj_holds_id,
				     struct drm_property *prop_holds_id);
bool drm_property_replace_blob(struct drm_property_blob **blob,
			       struct drm_property_blob *new_blob);
struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob);
void drm_property_blob_put(struct drm_property_blob *blob);

/**
 * drm_property_find - find property object
 * @dev: DRM device
 * @file_priv: drm file to check for lease against.
 * @id: property object id
 *
 * This function looks up the property object specified by id and returns it.
 */
static inline struct drm_property *drm_property_find(struct drm_device *dev,
						     struct drm_file *file_priv,
						     uint32_t id)
{
	struct drm_mode_object *mo;
	mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_PROPERTY);
	return mo ? obj_to_property(mo) : NULL;
}

#endif