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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 | #include <linux/export.h> | |
24 | #include <drm/drmP.h> | |
25 | #include <drm/drm_property.h> | |
26 | ||
27 | #include "drm_crtc_internal.h" | |
28 | ||
29 | static bool drm_property_type_valid(struct drm_property *property) | |
30 | { | |
31 | if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) | |
32 | return !(property->flags & DRM_MODE_PROP_LEGACY_TYPE); | |
33 | return !!(property->flags & DRM_MODE_PROP_LEGACY_TYPE); | |
34 | } | |
35 | ||
36 | /** | |
37 | * drm_property_create - create a new property type | |
38 | * @dev: drm device | |
39 | * @flags: flags specifying the property type | |
40 | * @name: name of the property | |
41 | * @num_values: number of pre-defined values | |
42 | * | |
43 | * This creates a new generic drm property which can then be attached to a drm | |
44 | * object with drm_object_attach_property. The returned property object must be | |
45 | * freed with drm_property_destroy. | |
46 | * | |
47 | * Note that the DRM core keeps a per-device list of properties and that, if | |
48 | * drm_mode_config_cleanup() is called, it will destroy all properties created | |
49 | * by the driver. | |
50 | * | |
51 | * Returns: | |
52 | * A pointer to the newly created property on success, NULL on failure. | |
53 | */ | |
54 | struct drm_property *drm_property_create(struct drm_device *dev, int flags, | |
55 | const char *name, int num_values) | |
56 | { | |
57 | struct drm_property *property = NULL; | |
58 | int ret; | |
59 | ||
60 | property = kzalloc(sizeof(struct drm_property), GFP_KERNEL); | |
61 | if (!property) | |
62 | return NULL; | |
63 | ||
64 | property->dev = dev; | |
65 | ||
66 | if (num_values) { | |
67 | property->values = kcalloc(num_values, sizeof(uint64_t), | |
68 | GFP_KERNEL); | |
69 | if (!property->values) | |
70 | goto fail; | |
71 | } | |
72 | ||
73 | ret = drm_mode_object_get(dev, &property->base, DRM_MODE_OBJECT_PROPERTY); | |
74 | if (ret) | |
75 | goto fail; | |
76 | ||
77 | property->flags = flags; | |
78 | property->num_values = num_values; | |
79 | INIT_LIST_HEAD(&property->enum_list); | |
80 | ||
81 | if (name) { | |
82 | strncpy(property->name, name, DRM_PROP_NAME_LEN); | |
83 | property->name[DRM_PROP_NAME_LEN-1] = '\0'; | |
84 | } | |
85 | ||
86 | list_add_tail(&property->head, &dev->mode_config.property_list); | |
87 | ||
88 | WARN_ON(!drm_property_type_valid(property)); | |
89 | ||
90 | return property; | |
91 | fail: | |
92 | kfree(property->values); | |
93 | kfree(property); | |
94 | return NULL; | |
95 | } | |
96 | EXPORT_SYMBOL(drm_property_create); | |
97 | ||
98 | /** | |
99 | * drm_property_create_enum - create a new enumeration property type | |
100 | * @dev: drm device | |
101 | * @flags: flags specifying the property type | |
102 | * @name: name of the property | |
103 | * @props: enumeration lists with property values | |
104 | * @num_values: number of pre-defined values | |
105 | * | |
106 | * This creates a new generic drm property which can then be attached to a drm | |
107 | * object with drm_object_attach_property. The returned property object must be | |
108 | * freed with drm_property_destroy. | |
109 | * | |
110 | * Userspace is only allowed to set one of the predefined values for enumeration | |
111 | * properties. | |
112 | * | |
113 | * Returns: | |
114 | * A pointer to the newly created property on success, NULL on failure. | |
115 | */ | |
116 | struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags, | |
117 | const char *name, | |
118 | const struct drm_prop_enum_list *props, | |
119 | int num_values) | |
120 | { | |
121 | struct drm_property *property; | |
122 | int i, ret; | |
123 | ||
124 | flags |= DRM_MODE_PROP_ENUM; | |
125 | ||
126 | property = drm_property_create(dev, flags, name, num_values); | |
127 | if (!property) | |
128 | return NULL; | |
129 | ||
130 | for (i = 0; i < num_values; i++) { | |
131 | ret = drm_property_add_enum(property, i, | |
132 | props[i].type, | |
133 | props[i].name); | |
134 | if (ret) { | |
135 | drm_property_destroy(dev, property); | |
136 | return NULL; | |
137 | } | |
138 | } | |
139 | ||
140 | return property; | |
141 | } | |
142 | EXPORT_SYMBOL(drm_property_create_enum); | |
143 | ||
144 | /** | |
145 | * drm_property_create_bitmask - create a new bitmask property type | |
146 | * @dev: drm device | |
147 | * @flags: flags specifying the property type | |
148 | * @name: name of the property | |
149 | * @props: enumeration lists with property bitflags | |
150 | * @num_props: size of the @props array | |
151 | * @supported_bits: bitmask of all supported enumeration values | |
152 | * | |
153 | * This creates a new bitmask drm property which can then be attached to a drm | |
154 | * object with drm_object_attach_property. The returned property object must be | |
155 | * freed with drm_property_destroy. | |
156 | * | |
157 | * Compared to plain enumeration properties userspace is allowed to set any | |
158 | * or'ed together combination of the predefined property bitflag values | |
159 | * | |
160 | * Returns: | |
161 | * A pointer to the newly created property on success, NULL on failure. | |
162 | */ | |
163 | struct drm_property *drm_property_create_bitmask(struct drm_device *dev, | |
164 | int flags, const char *name, | |
165 | const struct drm_prop_enum_list *props, | |
166 | int num_props, | |
167 | uint64_t supported_bits) | |
168 | { | |
169 | struct drm_property *property; | |
170 | int i, ret, index = 0; | |
171 | int num_values = hweight64(supported_bits); | |
172 | ||
173 | flags |= DRM_MODE_PROP_BITMASK; | |
174 | ||
175 | property = drm_property_create(dev, flags, name, num_values); | |
176 | if (!property) | |
177 | return NULL; | |
178 | for (i = 0; i < num_props; i++) { | |
179 | if (!(supported_bits & (1ULL << props[i].type))) | |
180 | continue; | |
181 | ||
182 | if (WARN_ON(index >= num_values)) { | |
183 | drm_property_destroy(dev, property); | |
184 | return NULL; | |
185 | } | |
186 | ||
187 | ret = drm_property_add_enum(property, index++, | |
188 | props[i].type, | |
189 | props[i].name); | |
190 | if (ret) { | |
191 | drm_property_destroy(dev, property); | |
192 | return NULL; | |
193 | } | |
194 | } | |
195 | ||
196 | return property; | |
197 | } | |
198 | EXPORT_SYMBOL(drm_property_create_bitmask); | |
199 | ||
200 | static struct drm_property *property_create_range(struct drm_device *dev, | |
201 | int flags, const char *name, | |
202 | uint64_t min, uint64_t max) | |
203 | { | |
204 | struct drm_property *property; | |
205 | ||
206 | property = drm_property_create(dev, flags, name, 2); | |
207 | if (!property) | |
208 | return NULL; | |
209 | ||
210 | property->values[0] = min; | |
211 | property->values[1] = max; | |
212 | ||
213 | return property; | |
214 | } | |
215 | ||
216 | /** | |
217 | * drm_property_create_range - create a new unsigned ranged property type | |
218 | * @dev: drm device | |
219 | * @flags: flags specifying the property type | |
220 | * @name: name of the property | |
221 | * @min: minimum value of the property | |
222 | * @max: maximum value of the property | |
223 | * | |
224 | * This creates a new generic drm property which can then be attached to a drm | |
225 | * object with drm_object_attach_property. The returned property object must be | |
226 | * freed with drm_property_destroy. | |
227 | * | |
228 | * Userspace is allowed to set any unsigned integer value in the (min, max) | |
229 | * range inclusive. | |
230 | * | |
231 | * Returns: | |
232 | * A pointer to the newly created property on success, NULL on failure. | |
233 | */ | |
234 | struct drm_property *drm_property_create_range(struct drm_device *dev, int flags, | |
235 | const char *name, | |
236 | uint64_t min, uint64_t max) | |
237 | { | |
238 | return property_create_range(dev, DRM_MODE_PROP_RANGE | flags, | |
239 | name, min, max); | |
240 | } | |
241 | EXPORT_SYMBOL(drm_property_create_range); | |
242 | ||
243 | /** | |
244 | * drm_property_create_signed_range - create a new signed ranged property type | |
245 | * @dev: drm device | |
246 | * @flags: flags specifying the property type | |
247 | * @name: name of the property | |
248 | * @min: minimum value of the property | |
249 | * @max: maximum value of the property | |
250 | * | |
251 | * This creates a new generic drm property which can then be attached to a drm | |
252 | * object with drm_object_attach_property. The returned property object must be | |
253 | * freed with drm_property_destroy. | |
254 | * | |
255 | * Userspace is allowed to set any signed integer value in the (min, max) | |
256 | * range inclusive. | |
257 | * | |
258 | * Returns: | |
259 | * A pointer to the newly created property on success, NULL on failure. | |
260 | */ | |
261 | struct drm_property *drm_property_create_signed_range(struct drm_device *dev, | |
262 | int flags, const char *name, | |
263 | int64_t min, int64_t max) | |
264 | { | |
265 | return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags, | |
266 | name, I642U64(min), I642U64(max)); | |
267 | } | |
268 | EXPORT_SYMBOL(drm_property_create_signed_range); | |
269 | ||
270 | /** | |
271 | * drm_property_create_object - create a new object property type | |
272 | * @dev: drm device | |
273 | * @flags: flags specifying the property type | |
274 | * @name: name of the property | |
275 | * @type: object type from DRM_MODE_OBJECT_* defines | |
276 | * | |
277 | * This creates a new generic drm property which can then be attached to a drm | |
278 | * object with drm_object_attach_property. The returned property object must be | |
279 | * freed with drm_property_destroy. | |
280 | * | |
281 | * Userspace is only allowed to set this to any property value of the given | |
282 | * @type. Only useful for atomic properties, which is enforced. | |
283 | * | |
284 | * Returns: | |
285 | * A pointer to the newly created property on success, NULL on failure. | |
286 | */ | |
287 | struct drm_property *drm_property_create_object(struct drm_device *dev, | |
288 | int flags, const char *name, uint32_t type) | |
289 | { | |
290 | struct drm_property *property; | |
291 | ||
292 | flags |= DRM_MODE_PROP_OBJECT; | |
293 | ||
294 | if (WARN_ON(!(flags & DRM_MODE_PROP_ATOMIC))) | |
295 | return NULL; | |
296 | ||
297 | property = drm_property_create(dev, flags, name, 1); | |
298 | if (!property) | |
299 | return NULL; | |
300 | ||
301 | property->values[0] = type; | |
302 | ||
303 | return property; | |
304 | } | |
305 | EXPORT_SYMBOL(drm_property_create_object); | |
306 | ||
307 | /** | |
308 | * drm_property_create_bool - create a new boolean property type | |
309 | * @dev: drm device | |
310 | * @flags: flags specifying the property type | |
311 | * @name: name of the property | |
312 | * | |
313 | * This creates a new generic drm property which can then be attached to a drm | |
314 | * object with drm_object_attach_property. The returned property object must be | |
315 | * freed with drm_property_destroy. | |
316 | * | |
317 | * This is implemented as a ranged property with only {0, 1} as valid values. | |
318 | * | |
319 | * Returns: | |
320 | * A pointer to the newly created property on success, NULL on failure. | |
321 | */ | |
322 | struct drm_property *drm_property_create_bool(struct drm_device *dev, int flags, | |
323 | const char *name) | |
324 | { | |
325 | return drm_property_create_range(dev, flags, name, 0, 1); | |
326 | } | |
327 | EXPORT_SYMBOL(drm_property_create_bool); | |
328 | ||
329 | /** | |
330 | * drm_property_add_enum - add a possible value to an enumeration property | |
331 | * @property: enumeration property to change | |
332 | * @index: index of the new enumeration | |
333 | * @value: value of the new enumeration | |
334 | * @name: symbolic name of the new enumeration | |
335 | * | |
336 | * This functions adds enumerations to a property. | |
337 | * | |
338 | * It's use is deprecated, drivers should use one of the more specific helpers | |
339 | * to directly create the property with all enumerations already attached. | |
340 | * | |
341 | * Returns: | |
342 | * Zero on success, error code on failure. | |
343 | */ | |
344 | int drm_property_add_enum(struct drm_property *property, int index, | |
345 | uint64_t value, const char *name) | |
346 | { | |
347 | struct drm_property_enum *prop_enum; | |
348 | ||
349 | if (!(drm_property_type_is(property, DRM_MODE_PROP_ENUM) || | |
350 | drm_property_type_is(property, DRM_MODE_PROP_BITMASK))) | |
351 | return -EINVAL; | |
352 | ||
353 | /* | |
354 | * Bitmask enum properties have the additional constraint of values | |
355 | * from 0 to 63 | |
356 | */ | |
357 | if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK) && | |
358 | (value > 63)) | |
359 | return -EINVAL; | |
360 | ||
361 | if (!list_empty(&property->enum_list)) { | |
362 | list_for_each_entry(prop_enum, &property->enum_list, head) { | |
363 | if (prop_enum->value == value) { | |
364 | strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN); | |
365 | prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0'; | |
366 | return 0; | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
371 | prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL); | |
372 | if (!prop_enum) | |
373 | return -ENOMEM; | |
374 | ||
375 | strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN); | |
376 | prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0'; | |
377 | prop_enum->value = value; | |
378 | ||
379 | property->values[index] = value; | |
380 | list_add_tail(&prop_enum->head, &property->enum_list); | |
381 | return 0; | |
382 | } | |
383 | EXPORT_SYMBOL(drm_property_add_enum); | |
384 | ||
385 | /** | |
386 | * drm_property_destroy - destroy a drm property | |
387 | * @dev: drm device | |
388 | * @property: property to destry | |
389 | * | |
390 | * This function frees a property including any attached resources like | |
391 | * enumeration values. | |
392 | */ | |
393 | void drm_property_destroy(struct drm_device *dev, struct drm_property *property) | |
394 | { | |
395 | struct drm_property_enum *prop_enum, *pt; | |
396 | ||
397 | list_for_each_entry_safe(prop_enum, pt, &property->enum_list, head) { | |
398 | list_del(&prop_enum->head); | |
399 | kfree(prop_enum); | |
400 | } | |
401 | ||
402 | if (property->num_values) | |
403 | kfree(property->values); | |
404 | drm_mode_object_unregister(dev, &property->base); | |
405 | list_del(&property->head); | |
406 | kfree(property); | |
407 | } | |
408 | EXPORT_SYMBOL(drm_property_destroy); | |
409 | ||
410 | /** | |
411 | * drm_mode_getproperty_ioctl - get the property metadata | |
412 | * @dev: DRM device | |
413 | * @data: ioctl data | |
414 | * @file_priv: DRM file info | |
415 | * | |
416 | * This function retrieves the metadata for a given property, like the different | |
417 | * possible values for an enum property or the limits for a range property. | |
418 | * | |
419 | * Blob properties are special | |
420 | * | |
421 | * Called by the user via ioctl. | |
422 | * | |
423 | * Returns: | |
424 | * Zero on success, negative errno on failure. | |
425 | */ | |
426 | int drm_mode_getproperty_ioctl(struct drm_device *dev, | |
427 | void *data, struct drm_file *file_priv) | |
428 | { | |
429 | struct drm_mode_get_property *out_resp = data; | |
430 | struct drm_property *property; | |
431 | int enum_count = 0; | |
432 | int value_count = 0; | |
433 | int ret = 0, i; | |
434 | int copied; | |
435 | struct drm_property_enum *prop_enum; | |
436 | struct drm_mode_property_enum __user *enum_ptr; | |
437 | uint64_t __user *values_ptr; | |
438 | ||
439 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
440 | return -EINVAL; | |
441 | ||
442 | drm_modeset_lock_all(dev); | |
443 | property = drm_property_find(dev, out_resp->prop_id); | |
444 | if (!property) { | |
445 | ret = -ENOENT; | |
446 | goto done; | |
447 | } | |
448 | ||
449 | if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) || | |
450 | drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) { | |
451 | list_for_each_entry(prop_enum, &property->enum_list, head) | |
452 | enum_count++; | |
453 | } | |
454 | ||
455 | value_count = property->num_values; | |
456 | ||
457 | strncpy(out_resp->name, property->name, DRM_PROP_NAME_LEN); | |
458 | out_resp->name[DRM_PROP_NAME_LEN-1] = 0; | |
459 | out_resp->flags = property->flags; | |
460 | ||
461 | if ((out_resp->count_values >= value_count) && value_count) { | |
462 | values_ptr = (uint64_t __user *)(unsigned long)out_resp->values_ptr; | |
463 | for (i = 0; i < value_count; i++) { | |
464 | if (copy_to_user(values_ptr + i, &property->values[i], sizeof(uint64_t))) { | |
465 | ret = -EFAULT; | |
466 | goto done; | |
467 | } | |
468 | } | |
469 | } | |
470 | out_resp->count_values = value_count; | |
471 | ||
472 | if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) || | |
473 | drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) { | |
474 | if ((out_resp->count_enum_blobs >= enum_count) && enum_count) { | |
475 | copied = 0; | |
476 | enum_ptr = (struct drm_mode_property_enum __user *)(unsigned long)out_resp->enum_blob_ptr; | |
477 | list_for_each_entry(prop_enum, &property->enum_list, head) { | |
478 | ||
479 | if (copy_to_user(&enum_ptr[copied].value, &prop_enum->value, sizeof(uint64_t))) { | |
480 | ret = -EFAULT; | |
481 | goto done; | |
482 | } | |
483 | ||
484 | if (copy_to_user(&enum_ptr[copied].name, | |
485 | &prop_enum->name, DRM_PROP_NAME_LEN)) { | |
486 | ret = -EFAULT; | |
487 | goto done; | |
488 | } | |
489 | copied++; | |
490 | } | |
491 | } | |
492 | out_resp->count_enum_blobs = enum_count; | |
493 | } | |
494 | ||
495 | /* | |
496 | * NOTE: The idea seems to have been to use this to read all the blob | |
497 | * property values. But nothing ever added them to the corresponding | |
498 | * list, userspace always used the special-purpose get_blob ioctl to | |
499 | * read the value for a blob property. It also doesn't make a lot of | |
500 | * sense to return values here when everything else is just metadata for | |
501 | * the property itself. | |
502 | */ | |
503 | if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) | |
504 | out_resp->count_enum_blobs = 0; | |
505 | done: | |
506 | drm_modeset_unlock_all(dev); | |
507 | return ret; | |
508 | } | |
509 | ||
510 | static void drm_property_free_blob(struct kref *kref) | |
511 | { | |
512 | struct drm_property_blob *blob = | |
513 | container_of(kref, struct drm_property_blob, base.refcount); | |
514 | ||
515 | mutex_lock(&blob->dev->mode_config.blob_lock); | |
516 | list_del(&blob->head_global); | |
517 | mutex_unlock(&blob->dev->mode_config.blob_lock); | |
518 | ||
519 | drm_mode_object_unregister(blob->dev, &blob->base); | |
520 | ||
521 | kfree(blob); | |
522 | } | |
523 | ||
524 | /** | |
525 | * drm_property_create_blob - Create new blob property | |
526 | * | |
527 | * Creates a new blob property for a specified DRM device, optionally | |
528 | * copying data. | |
529 | * | |
530 | * @dev: DRM device to create property for | |
531 | * @length: Length to allocate for blob data | |
532 | * @data: If specified, copies data into blob | |
533 | * | |
534 | * Returns: | |
535 | * New blob property with a single reference on success, or an ERR_PTR | |
536 | * value on failure. | |
537 | */ | |
538 | struct drm_property_blob * | |
539 | drm_property_create_blob(struct drm_device *dev, size_t length, | |
540 | const void *data) | |
541 | { | |
542 | struct drm_property_blob *blob; | |
543 | int ret; | |
544 | ||
545 | if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob)) | |
546 | return ERR_PTR(-EINVAL); | |
547 | ||
548 | blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); | |
549 | if (!blob) | |
550 | return ERR_PTR(-ENOMEM); | |
551 | ||
552 | /* This must be explicitly initialised, so we can safely call list_del | |
553 | * on it in the removal handler, even if it isn't in a file list. */ | |
554 | INIT_LIST_HEAD(&blob->head_file); | |
555 | blob->length = length; | |
556 | blob->dev = dev; | |
557 | ||
558 | if (data) | |
559 | memcpy(blob->data, data, length); | |
560 | ||
561 | ret = drm_mode_object_get_reg(dev, &blob->base, DRM_MODE_OBJECT_BLOB, | |
562 | true, drm_property_free_blob); | |
563 | if (ret) { | |
564 | kfree(blob); | |
565 | return ERR_PTR(-EINVAL); | |
566 | } | |
567 | ||
568 | mutex_lock(&dev->mode_config.blob_lock); | |
569 | list_add_tail(&blob->head_global, | |
570 | &dev->mode_config.property_blob_list); | |
571 | mutex_unlock(&dev->mode_config.blob_lock); | |
572 | ||
573 | return blob; | |
574 | } | |
575 | EXPORT_SYMBOL(drm_property_create_blob); | |
576 | ||
577 | /** | |
578 | * drm_property_unreference_blob - Unreference a blob property | |
579 | * | |
580 | * Drop a reference on a blob property. May free the object. | |
581 | * | |
582 | * @blob: Pointer to blob property | |
583 | */ | |
584 | void drm_property_unreference_blob(struct drm_property_blob *blob) | |
585 | { | |
586 | if (!blob) | |
587 | return; | |
588 | ||
589 | drm_mode_object_unreference(&blob->base); | |
590 | } | |
591 | EXPORT_SYMBOL(drm_property_unreference_blob); | |
592 | ||
593 | /** | |
594 | * drm_property_destroy_user_blobs - destroy all blobs created by this client | |
595 | * @dev: DRM device | |
596 | * @file_priv: destroy all blobs owned by this file handle | |
597 | */ | |
598 | void drm_property_destroy_user_blobs(struct drm_device *dev, | |
599 | struct drm_file *file_priv) | |
600 | { | |
601 | struct drm_property_blob *blob, *bt; | |
602 | ||
603 | /* | |
604 | * When the file gets released that means no one else can access the | |
605 | * blob list any more, so no need to grab dev->blob_lock. | |
606 | */ | |
607 | list_for_each_entry_safe(blob, bt, &file_priv->blobs, head_file) { | |
608 | list_del_init(&blob->head_file); | |
609 | drm_property_unreference_blob(blob); | |
610 | } | |
611 | } | |
612 | ||
613 | /** | |
614 | * drm_property_reference_blob - Take a reference on an existing property | |
615 | * | |
616 | * Take a new reference on an existing blob property. | |
617 | * | |
618 | * @blob: Pointer to blob property | |
619 | */ | |
620 | struct drm_property_blob *drm_property_reference_blob(struct drm_property_blob *blob) | |
621 | { | |
622 | drm_mode_object_reference(&blob->base); | |
623 | return blob; | |
624 | } | |
625 | EXPORT_SYMBOL(drm_property_reference_blob); | |
626 | ||
627 | /** | |
628 | * drm_property_lookup_blob - look up a blob property and take a reference | |
629 | * @dev: drm device | |
630 | * @id: id of the blob property | |
631 | * | |
632 | * If successful, this takes an additional reference to the blob property. | |
633 | * callers need to make sure to eventually unreference the returned property | |
634 | * again, using @drm_property_unreference_blob. | |
635 | */ | |
636 | struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev, | |
637 | uint32_t id) | |
638 | { | |
639 | struct drm_mode_object *obj; | |
640 | struct drm_property_blob *blob = NULL; | |
641 | ||
642 | obj = __drm_mode_object_find(dev, id, DRM_MODE_OBJECT_BLOB); | |
643 | if (obj) | |
644 | blob = obj_to_blob(obj); | |
645 | return blob; | |
646 | } | |
647 | EXPORT_SYMBOL(drm_property_lookup_blob); | |
648 | ||
649 | /** | |
650 | * drm_property_replace_global_blob - atomically replace existing blob property | |
651 | * @dev: drm device | |
652 | * @replace: location of blob property pointer to be replaced | |
653 | * @length: length of data for new blob, or 0 for no data | |
654 | * @data: content for new blob, or NULL for no data | |
655 | * @obj_holds_id: optional object for property holding blob ID | |
656 | * @prop_holds_id: optional property holding blob ID | |
657 | * @return 0 on success or error on failure | |
658 | * | |
659 | * This function will atomically replace a global property in the blob list, | |
660 | * optionally updating a property which holds the ID of that property. It is | |
661 | * guaranteed to be atomic: no caller will be allowed to see intermediate | |
662 | * results, and either the entire operation will succeed and clean up the | |
663 | * previous property, or it will fail and the state will be unchanged. | |
664 | * | |
665 | * If length is 0 or data is NULL, no new blob will be created, and the holding | |
666 | * property, if specified, will be set to 0. | |
667 | * | |
668 | * Access to the replace pointer is assumed to be protected by the caller, e.g. | |
669 | * by holding the relevant modesetting object lock for its parent. | |
670 | * | |
671 | * For example, a drm_connector has a 'PATH' property, which contains the ID | |
672 | * of a blob property with the value of the MST path information. Calling this | |
673 | * function with replace pointing to the connector's path_blob_ptr, length and | |
674 | * data set for the new path information, obj_holds_id set to the connector's | |
675 | * base object, and prop_holds_id set to the path property name, will perform | |
676 | * a completely atomic update. The access to path_blob_ptr is protected by the | |
677 | * caller holding a lock on the connector. | |
678 | */ | |
679 | int drm_property_replace_global_blob(struct drm_device *dev, | |
680 | struct drm_property_blob **replace, | |
681 | size_t length, | |
682 | const void *data, | |
683 | struct drm_mode_object *obj_holds_id, | |
684 | struct drm_property *prop_holds_id) | |
685 | { | |
686 | struct drm_property_blob *new_blob = NULL; | |
687 | struct drm_property_blob *old_blob = NULL; | |
688 | int ret; | |
689 | ||
690 | WARN_ON(replace == NULL); | |
691 | ||
692 | old_blob = *replace; | |
693 | ||
694 | if (length && data) { | |
695 | new_blob = drm_property_create_blob(dev, length, data); | |
696 | if (IS_ERR(new_blob)) | |
697 | return PTR_ERR(new_blob); | |
698 | } | |
699 | ||
700 | /* This does not need to be synchronised with blob_lock, as the | |
701 | * get_properties ioctl locks all modesetting objects, and | |
702 | * obj_holds_id must be locked before calling here, so we cannot | |
703 | * have its value out of sync with the list membership modified | |
704 | * below under blob_lock. */ | |
705 | if (obj_holds_id) { | |
706 | ret = drm_object_property_set_value(obj_holds_id, | |
707 | prop_holds_id, | |
708 | new_blob ? | |
709 | new_blob->base.id : 0); | |
710 | if (ret != 0) | |
711 | goto err_created; | |
712 | } | |
713 | ||
714 | drm_property_unreference_blob(old_blob); | |
715 | *replace = new_blob; | |
716 | ||
717 | return 0; | |
718 | ||
719 | err_created: | |
720 | drm_property_unreference_blob(new_blob); | |
721 | return ret; | |
722 | } | |
723 | EXPORT_SYMBOL(drm_property_replace_global_blob); | |
724 | ||
725 | /** | |
726 | * drm_mode_getblob_ioctl - get the contents of a blob property value | |
727 | * @dev: DRM device | |
728 | * @data: ioctl data | |
729 | * @file_priv: DRM file info | |
730 | * | |
731 | * This function retrieves the contents of a blob property. The value stored in | |
732 | * an object's blob property is just a normal modeset object id. | |
733 | * | |
734 | * Called by the user via ioctl. | |
735 | * | |
736 | * Returns: | |
737 | * Zero on success, negative errno on failure. | |
738 | */ | |
739 | int drm_mode_getblob_ioctl(struct drm_device *dev, | |
740 | void *data, struct drm_file *file_priv) | |
741 | { | |
742 | struct drm_mode_get_blob *out_resp = data; | |
743 | struct drm_property_blob *blob; | |
744 | int ret = 0; | |
745 | void __user *blob_ptr; | |
746 | ||
747 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
748 | return -EINVAL; | |
749 | ||
750 | blob = drm_property_lookup_blob(dev, out_resp->blob_id); | |
751 | if (!blob) | |
752 | return -ENOENT; | |
753 | ||
754 | if (out_resp->length == blob->length) { | |
755 | blob_ptr = (void __user *)(unsigned long)out_resp->data; | |
756 | if (copy_to_user(blob_ptr, blob->data, blob->length)) { | |
757 | ret = -EFAULT; | |
758 | goto unref; | |
759 | } | |
760 | } | |
761 | out_resp->length = blob->length; | |
762 | unref: | |
763 | drm_property_unreference_blob(blob); | |
764 | ||
765 | return ret; | |
766 | } | |
767 | ||
768 | /** | |
769 | * drm_mode_createblob_ioctl - create a new blob property | |
770 | * @dev: DRM device | |
771 | * @data: ioctl data | |
772 | * @file_priv: DRM file info | |
773 | * | |
774 | * This function creates a new blob property with user-defined values. In order | |
775 | * to give us sensible validation and checking when creating, rather than at | |
776 | * every potential use, we also require a type to be provided upfront. | |
777 | * | |
778 | * Called by the user via ioctl. | |
779 | * | |
780 | * Returns: | |
781 | * Zero on success, negative errno on failure. | |
782 | */ | |
783 | int drm_mode_createblob_ioctl(struct drm_device *dev, | |
784 | void *data, struct drm_file *file_priv) | |
785 | { | |
786 | struct drm_mode_create_blob *out_resp = data; | |
787 | struct drm_property_blob *blob; | |
788 | void __user *blob_ptr; | |
789 | int ret = 0; | |
790 | ||
791 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
792 | return -EINVAL; | |
793 | ||
794 | blob = drm_property_create_blob(dev, out_resp->length, NULL); | |
795 | if (IS_ERR(blob)) | |
796 | return PTR_ERR(blob); | |
797 | ||
798 | blob_ptr = (void __user *)(unsigned long)out_resp->data; | |
799 | if (copy_from_user(blob->data, blob_ptr, out_resp->length)) { | |
800 | ret = -EFAULT; | |
801 | goto out_blob; | |
802 | } | |
803 | ||
804 | /* Dropping the lock between create_blob and our access here is safe | |
805 | * as only the same file_priv can remove the blob; at this point, it is | |
806 | * not associated with any file_priv. */ | |
807 | mutex_lock(&dev->mode_config.blob_lock); | |
808 | out_resp->blob_id = blob->base.id; | |
809 | list_add_tail(&blob->head_file, &file_priv->blobs); | |
810 | mutex_unlock(&dev->mode_config.blob_lock); | |
811 | ||
812 | return 0; | |
813 | ||
814 | out_blob: | |
815 | drm_property_unreference_blob(blob); | |
816 | return ret; | |
817 | } | |
818 | ||
819 | /** | |
820 | * drm_mode_destroyblob_ioctl - destroy a user blob property | |
821 | * @dev: DRM device | |
822 | * @data: ioctl data | |
823 | * @file_priv: DRM file info | |
824 | * | |
825 | * Destroy an existing user-defined blob property. | |
826 | * | |
827 | * Called by the user via ioctl. | |
828 | * | |
829 | * Returns: | |
830 | * Zero on success, negative errno on failure. | |
831 | */ | |
832 | int drm_mode_destroyblob_ioctl(struct drm_device *dev, | |
833 | void *data, struct drm_file *file_priv) | |
834 | { | |
835 | struct drm_mode_destroy_blob *out_resp = data; | |
836 | struct drm_property_blob *blob = NULL, *bt; | |
837 | bool found = false; | |
838 | int ret = 0; | |
839 | ||
840 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
841 | return -EINVAL; | |
842 | ||
843 | blob = drm_property_lookup_blob(dev, out_resp->blob_id); | |
844 | if (!blob) | |
845 | return -ENOENT; | |
846 | ||
847 | mutex_lock(&dev->mode_config.blob_lock); | |
848 | /* Ensure the property was actually created by this user. */ | |
849 | list_for_each_entry(bt, &file_priv->blobs, head_file) { | |
850 | if (bt == blob) { | |
851 | found = true; | |
852 | break; | |
853 | } | |
854 | } | |
855 | ||
856 | if (!found) { | |
857 | ret = -EPERM; | |
858 | goto err; | |
859 | } | |
860 | ||
861 | /* We must drop head_file here, because we may not be the last | |
862 | * reference on the blob. */ | |
863 | list_del_init(&blob->head_file); | |
864 | mutex_unlock(&dev->mode_config.blob_lock); | |
865 | ||
866 | /* One reference from lookup, and one from the filp. */ | |
867 | drm_property_unreference_blob(blob); | |
868 | drm_property_unreference_blob(blob); | |
869 | ||
870 | return 0; | |
871 | ||
872 | err: | |
873 | mutex_unlock(&dev->mode_config.blob_lock); | |
874 | drm_property_unreference_blob(blob); | |
875 | ||
876 | return ret; | |
877 | } | |
878 | ||
879 | /* Some properties could refer to dynamic refcnt'd objects, or things that | |
880 | * need special locking to handle lifetime issues (ie. to ensure the prop | |
881 | * value doesn't become invalid part way through the property update due to | |
882 | * race). The value returned by reference via 'obj' should be passed back | |
883 | * to drm_property_change_valid_put() after the property is set (and the | |
884 | * object to which the property is attached has a chance to take it's own | |
885 | * reference). | |
886 | */ | |
887 | bool drm_property_change_valid_get(struct drm_property *property, | |
888 | uint64_t value, struct drm_mode_object **ref) | |
889 | { | |
890 | int i; | |
891 | ||
892 | if (property->flags & DRM_MODE_PROP_IMMUTABLE) | |
893 | return false; | |
894 | ||
895 | *ref = NULL; | |
896 | ||
897 | if (drm_property_type_is(property, DRM_MODE_PROP_RANGE)) { | |
898 | if (value < property->values[0] || value > property->values[1]) | |
899 | return false; | |
900 | return true; | |
901 | } else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) { | |
902 | int64_t svalue = U642I64(value); | |
903 | ||
904 | if (svalue < U642I64(property->values[0]) || | |
905 | svalue > U642I64(property->values[1])) | |
906 | return false; | |
907 | return true; | |
908 | } else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) { | |
909 | uint64_t valid_mask = 0; | |
910 | ||
911 | for (i = 0; i < property->num_values; i++) | |
912 | valid_mask |= (1ULL << property->values[i]); | |
913 | return !(value & ~valid_mask); | |
914 | } else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) { | |
915 | struct drm_property_blob *blob; | |
916 | ||
917 | if (value == 0) | |
918 | return true; | |
919 | ||
920 | blob = drm_property_lookup_blob(property->dev, value); | |
921 | if (blob) { | |
922 | *ref = &blob->base; | |
923 | return true; | |
924 | } else { | |
925 | return false; | |
926 | } | |
927 | } else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) { | |
928 | /* a zero value for an object property translates to null: */ | |
929 | if (value == 0) | |
930 | return true; | |
931 | ||
932 | *ref = __drm_mode_object_find(property->dev, value, | |
933 | property->values[0]); | |
934 | return *ref != NULL; | |
935 | } | |
936 | ||
937 | for (i = 0; i < property->num_values; i++) | |
938 | if (property->values[i] == value) | |
939 | return true; | |
940 | return false; | |
941 | } | |
942 | ||
943 | void drm_property_change_valid_put(struct drm_property *property, | |
944 | struct drm_mode_object *ref) | |
945 | { | |
946 | if (!ref) | |
947 | return; | |
948 | ||
949 | if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) { | |
950 | drm_mode_object_unreference(ref); | |
951 | } else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) | |
952 | drm_property_unreference_blob(obj_to_blob(ref)); | |
953 | } |