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_PROPERTY_H__
24 #define __DRM_PROPERTY_H__
25
26 #include <linux/list.h>
27 #include <linux/ctype.h>
28 #include <drm/drm_mode_object.h>
29
30 #include <uapi/drm/drm_mode.h>
31
32 /**
33 * struct drm_property_enum - symbolic values for enumerations
34 * @value: numeric property value for this enum entry
35 * @head: list of enum values, linked to &drm_property.enum_list
36 * @name: symbolic name for the enum
37 *
38 * For enumeration and bitmask properties this structure stores the symbolic
39 * decoding for each value. This is used for example for the rotation property.
40 */
41 struct drm_property_enum {
42 uint64_t value;
43 struct list_head head;
44 char name[DRM_PROP_NAME_LEN];
45 };
46
47 /**
48 * struct drm_property - modeset object property
49 *
50 * This structure represent a modeset object property. It combines both the name
51 * of the property with the set of permissible values. This means that when a
52 * driver wants to use a property with the same name on different objects, but
53 * with different value ranges, then it must create property for each one. An
54 * example would be rotation of &drm_plane, when e.g. the primary plane cannot
55 * be rotated. But if both the name and the value range match, then the same
56 * property structure can be instantiated multiple times for the same object.
57 * Userspace must be able to cope with this and cannot assume that the same
58 * symbolic property will have the same modeset object ID on all modeset
59 * objects.
60 *
61 * Properties are created by one of the special functions, as explained in
62 * detail in the @flags structure member.
63 *
64 * To actually expose a property it must be attached to each object using
65 * drm_object_attach_property(). Currently properties can only be attached to
66 * &drm_connector, &drm_crtc and &drm_plane.
67 *
68 * Properties are also used as the generic metadatatransport for the atomic
69 * IOCTL. Everything that was set directly in structures in the legacy modeset
70 * IOCTLs (like the plane source or destination windows, or e.g. the links to
71 * the CRTC) is exposed as a property with the DRM_MODE_PROP_ATOMIC flag set.
72 */
73 struct drm_property {
74 /**
75 * @head: per-device list of properties, for cleanup.
76 */
77 struct list_head head;
78
79 /**
80 * @base: base KMS object
81 */
82 struct drm_mode_object base;
83
84 /**
85 * @flags:
86 *
87 * Property flags and type. A property needs to be one of the following
88 * types:
89 *
90 * DRM_MODE_PROP_RANGE
91 * Range properties report their minimum and maximum admissible unsigned values.
92 * The KMS core verifies that values set by application fit in that
93 * range. The range is unsigned. Range properties are created using
94 * drm_property_create_range().
95 *
96 * DRM_MODE_PROP_SIGNED_RANGE
97 * Range properties report their minimum and maximum admissible unsigned values.
98 * The KMS core verifies that values set by application fit in that
99 * range. The range is signed. Range properties are created using
100 * drm_property_create_signed_range().
101 *
102 * DRM_MODE_PROP_ENUM
103 * Enumerated properties take a numerical value that ranges from 0 to
104 * the number of enumerated values defined by the property minus one,
105 * and associate a free-formed string name to each value. Applications
106 * can retrieve the list of defined value-name pairs and use the
107 * numerical value to get and set property instance values. Enum
108 * properties are created using drm_property_create_enum().
109 *
110 * DRM_MODE_PROP_BITMASK
111 * Bitmask properties are enumeration properties that additionally
112 * restrict all enumerated values to the 0..63 range. Bitmask property
113 * instance values combine one or more of the enumerated bits defined
114 * by the property. Bitmask properties are created using
115 * drm_property_create_bitmask().
116 *
117 * DRM_MODE_PROB_OBJECT
118 * Object properties are used to link modeset objects. This is used
119 * extensively in the atomic support to create the display pipeline,
120 * by linking &drm_framebuffer to &drm_plane, &drm_plane to
121 * &drm_crtc and &drm_connector to &drm_crtc. An object property can
122 * only link to a specific type of &drm_mode_object, this limit is
123 * enforced by the core. Object properties are created using
124 * drm_property_create_object().
125 *
126 * Object properties work like blob properties, but in a more
127 * general fashion. They are limited to atomic drivers and must have
128 * the DRM_MODE_PROP_ATOMIC flag set.
129 *
130 * DRM_MODE_PROP_BLOB
131 * Blob properties store a binary blob without any format restriction.
132 * The binary blobs are created as KMS standalone objects, and blob
133 * property instance values store the ID of their associated blob
134 * object. Blob properties are created by calling
135 * drm_property_create() with DRM_MODE_PROP_BLOB as the type.
136 *
137 * Actual blob objects to contain blob data are created using
138 * drm_property_create_blob(), or through the corresponding IOCTL.
139 *
140 * Besides the built-in limit to only accept blob objects blob
141 * properties work exactly like object properties. The only reasons
142 * blob properties exist is backwards compatibility with existing
143 * userspace.
144 *
145 * In addition a property can have any combination of the below flags:
146 *
147 * DRM_MODE_PROP_ATOMIC
148 * Set for properties which encode atomic modeset state. Such
149 * properties are not exposed to legacy userspace.
150 *
151 * DRM_MODE_PROP_IMMUTABLE
152 * Set for properties whose values cannot be changed by
153 * userspace. The kernel is allowed to update the value of these
154 * properties. This is generally used to expose probe state to
155 * userspace, e.g. the EDID, or the connector path property on DP
156 * MST sinks. Kernel can update the value of an immutable property
157 * by calling drm_object_property_set_value().
158 */
159 uint32_t flags;
160
161 /**
162 * @name: symbolic name of the properties
163 */
164 char name[DRM_PROP_NAME_LEN];
165
166 /**
167 * @num_values: size of the @values array.
168 */
169 uint32_t num_values;
170
171 /**
172 * @values:
173 *
174 * Array with limits and values for the property. The
175 * interpretation of these limits is dependent upon the type per @flags.
176 */
177 uint64_t *values;
178
179 /**
180 * @dev: DRM device
181 */
182 struct drm_device *dev;
183
184 /**
185 * @enum_list:
186 *
187 * List of &drm_prop_enum_list structures with the symbolic names for
188 * enum and bitmask values.
189 */
190 struct list_head enum_list;
191 };
192
193 /**
194 * struct drm_property_blob - Blob data for &drm_property
195 * @base: base KMS object
196 * @dev: DRM device
197 * @head_global: entry on the global blob list in
198 * &drm_mode_config.property_blob_list.
199 * @head_file: entry on the per-file blob list in &drm_file.blobs list.
200 * @length: size of the blob in bytes, invariant over the lifetime of the object
201 * @data: actual data, embedded at the end of this structure
202 *
203 * Blobs are used to store bigger values than what fits directly into the 64
204 * bits available for a &drm_property.
205 *
206 * Blobs are reference counted using drm_property_blob_get() and
207 * drm_property_blob_put(). They are created using drm_property_create_blob().
208 */
209 struct drm_property_blob {
210 struct drm_mode_object base;
211 struct drm_device *dev;
212 struct list_head head_global;
213 struct list_head head_file;
214 size_t length;
215 void *data;
216 };
217
218 struct drm_prop_enum_list {
219 int type;
220 const char *name;
221 };
222
223 #define obj_to_property(x) container_of(x, struct drm_property, base)
224 #define obj_to_blob(x) container_of(x, struct drm_property_blob, base)
225
226 /**
227 * drm_property_type_is - check the type of a property
228 * @property: property to check
229 * @type: property type to compare with
230 *
231 * This is a helper function becauase the uapi encoding of property types is
232 * a bit special for historical reasons.
233 */
234 static inline bool drm_property_type_is(struct drm_property *property,
235 uint32_t type)
236 {
237 /* instanceof for props.. handles extended type vs original types: */
238 if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
239 return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
240 return property->flags & type;
241 }
242
243 struct drm_property *drm_property_create(struct drm_device *dev,
244 u32 flags, const char *name,
245 int num_values);
246 struct drm_property *drm_property_create_enum(struct drm_device *dev,
247 u32 flags, const char *name,
248 const struct drm_prop_enum_list *props,
249 int num_values);
250 struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
251 u32 flags, const char *name,
252 const struct drm_prop_enum_list *props,
253 int num_props,
254 uint64_t supported_bits);
255 struct drm_property *drm_property_create_range(struct drm_device *dev,
256 u32 flags, const char *name,
257 uint64_t min, uint64_t max);
258 struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
259 u32 flags, const char *name,
260 int64_t min, int64_t max);
261 struct drm_property *drm_property_create_object(struct drm_device *dev,
262 u32 flags, const char *name,
263 uint32_t type);
264 struct drm_property *drm_property_create_bool(struct drm_device *dev,
265 u32 flags, const char *name);
266 int drm_property_add_enum(struct drm_property *property,
267 uint64_t value, const char *name);
268 void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
269
270 struct drm_property_blob *drm_property_create_blob(struct drm_device *dev,
271 size_t length,
272 const void *data);
273 struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
274 uint32_t id);
275 int drm_property_replace_global_blob(struct drm_device *dev,
276 struct drm_property_blob **replace,
277 size_t length,
278 const void *data,
279 struct drm_mode_object *obj_holds_id,
280 struct drm_property *prop_holds_id);
281 bool drm_property_replace_blob(struct drm_property_blob **blob,
282 struct drm_property_blob *new_blob);
283 struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob);
284 void drm_property_blob_put(struct drm_property_blob *blob);
285
286 /**
287 * drm_property_find - find property object
288 * @dev: DRM device
289 * @file_priv: drm file to check for lease against.
290 * @id: property object id
291 *
292 * This function looks up the property object specified by id and returns it.
293 */
294 static inline struct drm_property *drm_property_find(struct drm_device *dev,
295 struct drm_file *file_priv,
296 uint32_t id)
297 {
298 struct drm_mode_object *mo;
299 mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_PROPERTY);
300 return mo ? obj_to_property(mo) : NULL;
301 }
302
303 #endif