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 * @head: list of enum values, linked to &drm_property.enum_list
35 * @name: symbolic name for the enum
36 *
37 * For enumeration and bitmask properties this structure stores the symbolic
38 * decoding for each value. This is used for example for the rotation property.
39 */
40 struct drm_property_enum {
41 /**
42 * @value: numeric property value for this enum entry
43 *
44 * If the property has the type &DRM_MODE_PROP_BITMASK, @value stores a
45 * bitshift, not a bitmask. In other words, the enum entry is enabled
46 * if the bit number @value is set in the property's value. This enum
47 * entry has the bitmask ``1 << value``.
48 */
49 uint64_t value;
50 struct list_head head;
51 char name[DRM_PROP_NAME_LEN];
52 };
53
54 /**
55 * struct drm_property - modeset object property
56 *
57 * This structure represent a modeset object property. It combines both the name
58 * of the property with the set of permissible values. This means that when a
59 * driver wants to use a property with the same name on different objects, but
60 * with different value ranges, then it must create property for each one. An
61 * example would be rotation of &drm_plane, when e.g. the primary plane cannot
62 * be rotated. But if both the name and the value range match, then the same
63 * property structure can be instantiated multiple times for the same object.
64 * Userspace must be able to cope with this and cannot assume that the same
65 * symbolic property will have the same modeset object ID on all modeset
66 * objects.
67 *
68 * Properties are created by one of the special functions, as explained in
69 * detail in the @flags structure member.
70 *
71 * To actually expose a property it must be attached to each object using
72 * drm_object_attach_property(). Currently properties can only be attached to
73 * &drm_connector, &drm_crtc and &drm_plane.
74 *
75 * Properties are also used as the generic metadatatransport for the atomic
76 * IOCTL. Everything that was set directly in structures in the legacy modeset
77 * IOCTLs (like the plane source or destination windows, or e.g. the links to
78 * the CRTC) is exposed as a property with the DRM_MODE_PROP_ATOMIC flag set.
79 */
80 struct drm_property {
81 /**
82 * @head: per-device list of properties, for cleanup.
83 */
84 struct list_head head;
85
86 /**
87 * @base: base KMS object
88 */
89 struct drm_mode_object base;
90
91 /**
92 * @flags:
93 *
94 * Property flags and type. A property needs to be one of the following
95 * types:
96 *
97 * DRM_MODE_PROP_RANGE
98 * Range properties report their minimum and maximum admissible unsigned values.
99 * The KMS core verifies that values set by application fit in that
100 * range. The range is unsigned. Range properties are created using
101 * drm_property_create_range().
102 *
103 * DRM_MODE_PROP_SIGNED_RANGE
104 * Range properties report their minimum and maximum admissible unsigned values.
105 * The KMS core verifies that values set by application fit in that
106 * range. The range is signed. Range properties are created using
107 * drm_property_create_signed_range().
108 *
109 * DRM_MODE_PROP_ENUM
110 * Enumerated properties take a numerical value that ranges from 0 to
111 * the number of enumerated values defined by the property minus one,
112 * and associate a free-formed string name to each value. Applications
113 * can retrieve the list of defined value-name pairs and use the
114 * numerical value to get and set property instance values. Enum
115 * properties are created using drm_property_create_enum().
116 *
117 * DRM_MODE_PROP_BITMASK
118 * Bitmask properties are enumeration properties that additionally
119 * restrict all enumerated values to the 0..63 range. Bitmask property
120 * instance values combine one or more of the enumerated bits defined
121 * by the property. Bitmask properties are created using
122 * drm_property_create_bitmask().
123 *
124 * DRM_MODE_PROP_OBJECT
125 * Object properties are used to link modeset objects. This is used
126 * extensively in the atomic support to create the display pipeline,
127 * by linking &drm_framebuffer to &drm_plane, &drm_plane to
128 * &drm_crtc and &drm_connector to &drm_crtc. An object property can
129 * only link to a specific type of &drm_mode_object, this limit is
130 * enforced by the core. Object properties are created using
131 * drm_property_create_object().
132 *
133 * Object properties work like blob properties, but in a more
134 * general fashion. They are limited to atomic drivers and must have
135 * the DRM_MODE_PROP_ATOMIC flag set.
136 *
137 * DRM_MODE_PROP_BLOB
138 * Blob properties store a binary blob without any format restriction.
139 * The binary blobs are created as KMS standalone objects, and blob
140 * property instance values store the ID of their associated blob
141 * object. Blob properties are created by calling
142 * drm_property_create() with DRM_MODE_PROP_BLOB as the type.
143 *
144 * Actual blob objects to contain blob data are created using
145 * drm_property_create_blob(), or through the corresponding IOCTL.
146 *
147 * Besides the built-in limit to only accept blob objects blob
148 * properties work exactly like object properties. The only reasons
149 * blob properties exist is backwards compatibility with existing
150 * userspace.
151 *
152 * In addition a property can have any combination of the below flags:
153 *
154 * DRM_MODE_PROP_ATOMIC
155 * Set for properties which encode atomic modeset state. Such
156 * properties are not exposed to legacy userspace.
157 *
158 * DRM_MODE_PROP_IMMUTABLE
159 * Set for properties whose values cannot be changed by
160 * userspace. The kernel is allowed to update the value of these
161 * properties. This is generally used to expose probe state to
162 * userspace, e.g. the EDID, or the connector path property on DP
163 * MST sinks. Kernel can update the value of an immutable property
164 * by calling drm_object_property_set_value().
165 */
166 uint32_t flags;
167
168 /**
169 * @name: symbolic name of the properties
170 */
171 char name[DRM_PROP_NAME_LEN];
172
173 /**
174 * @num_values: size of the @values array.
175 */
176 uint32_t num_values;
177
178 /**
179 * @values:
180 *
181 * Array with limits and values for the property. The
182 * interpretation of these limits is dependent upon the type per @flags.
183 */
184 uint64_t *values;
185
186 /**
187 * @dev: DRM device
188 */
189 struct drm_device *dev;
190
191 /**
192 * @enum_list:
193 *
194 * List of &drm_prop_enum_list structures with the symbolic names for
195 * enum and bitmask values.
196 */
197 struct list_head enum_list;
198 };
199
200 /**
201 * struct drm_property_blob - Blob data for &drm_property
202 * @base: base KMS object
203 * @dev: DRM device
204 * @head_global: entry on the global blob list in
205 * &drm_mode_config.property_blob_list.
206 * @head_file: entry on the per-file blob list in &drm_file.blobs list.
207 * @length: size of the blob in bytes, invariant over the lifetime of the object
208 * @data: actual data, embedded at the end of this structure
209 *
210 * Blobs are used to store bigger values than what fits directly into the 64
211 * bits available for a &drm_property.
212 *
213 * Blobs are reference counted using drm_property_blob_get() and
214 * drm_property_blob_put(). They are created using drm_property_create_blob().
215 */
216 struct drm_property_blob {
217 struct drm_mode_object base;
218 struct drm_device *dev;
219 struct list_head head_global;
220 struct list_head head_file;
221 size_t length;
222 void *data;
223 };
224
225 struct drm_prop_enum_list {
226 int type;
227 const char *name;
228 };
229
230 #define obj_to_property(x) container_of(x, struct drm_property, base)
231 #define obj_to_blob(x) container_of(x, struct drm_property_blob, base)
232
233 /**
234 * drm_property_type_is - check the type of a property
235 * @property: property to check
236 * @type: property type to compare with
237 *
238 * This is a helper function becauase the uapi encoding of property types is
239 * a bit special for historical reasons.
240 */
241 static inline bool drm_property_type_is(struct drm_property *property,
242 uint32_t type)
243 {
244 /* instanceof for props.. handles extended type vs original types: */
245 if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
246 return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
247 return property->flags & type;
248 }
249
250 struct drm_property *drm_property_create(struct drm_device *dev,
251 u32 flags, const char *name,
252 int num_values);
253 struct drm_property *drm_property_create_enum(struct drm_device *dev,
254 u32 flags, const char *name,
255 const struct drm_prop_enum_list *props,
256 int num_values);
257 struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
258 u32 flags, const char *name,
259 const struct drm_prop_enum_list *props,
260 int num_props,
261 uint64_t supported_bits);
262 struct drm_property *drm_property_create_range(struct drm_device *dev,
263 u32 flags, const char *name,
264 uint64_t min, uint64_t max);
265 struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
266 u32 flags, const char *name,
267 int64_t min, int64_t max);
268 struct drm_property *drm_property_create_object(struct drm_device *dev,
269 u32 flags, const char *name,
270 uint32_t type);
271 struct drm_property *drm_property_create_bool(struct drm_device *dev,
272 u32 flags, const char *name);
273 int drm_property_add_enum(struct drm_property *property,
274 uint64_t value, const char *name);
275 void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
276
277 struct drm_property_blob *drm_property_create_blob(struct drm_device *dev,
278 size_t length,
279 const void *data);
280 struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
281 uint32_t id);
282 int drm_property_replace_blob_from_id(struct drm_device *dev,
283 struct drm_property_blob **blob,
284 uint64_t blob_id,
285 ssize_t expected_size,
286 ssize_t expected_elem_size,
287 bool *replaced);
288 int drm_property_replace_global_blob(struct drm_device *dev,
289 struct drm_property_blob **replace,
290 size_t length,
291 const void *data,
292 struct drm_mode_object *obj_holds_id,
293 struct drm_property *prop_holds_id);
294 bool drm_property_replace_blob(struct drm_property_blob **blob,
295 struct drm_property_blob *new_blob);
296 struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob);
297 void drm_property_blob_put(struct drm_property_blob *blob);
298
299 /**
300 * drm_property_find - find property object
301 * @dev: DRM device
302 * @file_priv: drm file to check for lease against.
303 * @id: property object id
304 *
305 * This function looks up the property object specified by id and returns it.
306 */
307 static inline struct drm_property *drm_property_find(struct drm_device *dev,
308 struct drm_file *file_priv,
309 uint32_t id)
310 {
311 struct drm_mode_object *mo;
312 mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_PROPERTY);
313 return mo ? obj_to_property(mo) : NULL;
314 }
315
316 #endif
317
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