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 <linux/uaccess.h>
25
26 #include <drm/drm_crtc.h>
27 #include <drm/drm_drv.h>
28 #include <drm/drm_file.h>
29 #include <drm/drm_framebuffer.h>
30 #include <drm/drm_property.h>
31
32 #include "drm_crtc_internal.h"
33
34 /**
35 * DOC: overview
36 *
37 * Properties as represented by &drm_property are used to extend the modeset
38 * interface exposed to userspace. For the atomic modeset IOCTL properties are
39 * even the only way to transport metadata about the desired new modeset
40 * configuration from userspace to the kernel. Properties have a well-defined
41 * value range, which is enforced by the drm core. See the documentation of the
42 * flags member of &struct drm_property for an overview of the different
43 * property types and ranges.
44 *
45 * Properties don't store the current value directly, but need to be
46 * instatiated by attaching them to a &drm_mode_object with
47 * drm_object_attach_property().
48 *
49 * Property values are only 64bit. To support bigger piles of data (like gamma
50 * tables, color correction matrices or large structures) a property can instead
51 * point at a &drm_property_blob with that additional data.
52 *
53 * Properties are defined by their symbolic name, userspace must keep a
54 * per-object mapping from those names to the property ID used in the atomic
55 * IOCTL and in the get/set property IOCTL.
56 */
57
58 static bool drm_property_flags_valid(u32 flags)
59 {
60 u32 legacy_type = flags & DRM_MODE_PROP_LEGACY_TYPE;
61 u32 ext_type = flags & DRM_MODE_PROP_EXTENDED_TYPE;
62
63 /* Reject undefined/deprecated flags */
64 if (flags & ~(DRM_MODE_PROP_LEGACY_TYPE |
65 DRM_MODE_PROP_EXTENDED_TYPE |
66 DRM_MODE_PROP_IMMUTABLE |
67 DRM_MODE_PROP_ATOMIC))
68 return false;
69
70 /* We want either a legacy type or an extended type, but not both */
71 if (!legacy_type == !ext_type)
72 return false;
73
74 /* Only one legacy type at a time please */
75 if (legacy_type && !is_power_of_2(legacy_type))
76 return false;
77
78 return true;
79 }
80
81 /**
82 * drm_property_create - create a new property type
83 * @dev: drm device
84 * @flags: flags specifying the property type
85 * @name: name of the property
86 * @num_values: number of pre-defined values
87 *
88 * This creates a new generic drm property which can then be attached to a drm
89 * object with drm_object_attach_property(). The returned property object must
90 * be freed with drm_property_destroy(), which is done automatically when
91 * calling drm_mode_config_cleanup().
92 *
93 * Returns:
94 * A pointer to the newly created property on success, NULL on failure.
95 */
96 struct drm_property *drm_property_create(struct drm_device *dev,
97 u32 flags, const char *name,
98 int num_values)
99 {
100 struct drm_property *property = NULL;
101 int ret;
102
103 if (WARN_ON(!drm_property_flags_valid(flags)))
104 return NULL;
105
106 if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN))
107 return NULL;
108
109 property = kzalloc(sizeof(struct drm_property), GFP_KERNEL);
110 if (!property)
111 return NULL;
112
113 property->dev = dev;
114
115 if (num_values) {
116 property->values = kcalloc(num_values, sizeof(uint64_t),
117 GFP_KERNEL);
118 if (!property->values)
119 goto fail;
120 }
121
122 ret = drm_mode_object_add(dev, &property->base, DRM_MODE_OBJECT_PROPERTY);
123 if (ret)
124 goto fail;
125
126 property->flags = flags;
127 property->num_values = num_values;
128 INIT_LIST_HEAD(&property->enum_list);
129
130 strncpy(property->name, name, DRM_PROP_NAME_LEN);
131 property->name[DRM_PROP_NAME_LEN-1] = '\0';
132
133 list_add_tail(&property->head, &dev->mode_config.property_list);
134
135 return property;
136 fail:
137 kfree(property->values);
138 kfree(property);
139 return NULL;
140 }
141 EXPORT_SYMBOL(drm_property_create);
142
143 /**
144 * drm_property_create_enum - create a new enumeration property type
145 * @dev: drm device
146 * @flags: flags specifying the property type
147 * @name: name of the property
148 * @props: enumeration lists with property values
149 * @num_values: number of pre-defined values
150 *
151 * This creates a new generic drm property which can then be attached to a drm
152 * object with drm_object_attach_property(). The returned property object must
153 * be freed with drm_property_destroy(), which is done automatically when
154 * calling drm_mode_config_cleanup().
155 *
156 * Userspace is only allowed to set one of the predefined values for enumeration
157 * properties.
158 *
159 * Returns:
160 * A pointer to the newly created property on success, NULL on failure.
161 */
162 struct drm_property *drm_property_create_enum(struct drm_device *dev,
163 u32 flags, const char *name,
164 const struct drm_prop_enum_list *props,
165 int num_values)
166 {
167 struct drm_property *property;
168 int i, ret;
169
170 flags |= DRM_MODE_PROP_ENUM;
171
172 property = drm_property_create(dev, flags, name, num_values);
173 if (!property)
174 return NULL;
175
176 for (i = 0; i < num_values; i++) {
177 ret = drm_property_add_enum(property,
178 props[i].type,
179 props[i].name);
180 if (ret) {
181 drm_property_destroy(dev, property);
182 return NULL;
183 }
184 }
185
186 return property;
187 }
188 EXPORT_SYMBOL(drm_property_create_enum);
189
190 /**
191 * drm_property_create_bitmask - create a new bitmask property type
192 * @dev: drm device
193 * @flags: flags specifying the property type
194 * @name: name of the property
195 * @props: enumeration lists with property bitflags
196 * @num_props: size of the @props array
197 * @supported_bits: bitmask of all supported enumeration values
198 *
199 * This creates a new bitmask drm property which can then be attached to a drm
200 * object with drm_object_attach_property(). The returned property object must
201 * be freed with drm_property_destroy(), which is done automatically when
202 * calling drm_mode_config_cleanup().
203 *
204 * Compared to plain enumeration properties userspace is allowed to set any
205 * or'ed together combination of the predefined property bitflag values
206 *
207 * Returns:
208 * A pointer to the newly created property on success, NULL on failure.
209 */
210 struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
211 u32 flags, const char *name,
212 const struct drm_prop_enum_list *props,
213 int num_props,
214 uint64_t supported_bits)
215 {
216 struct drm_property *property;
217 int i, ret;
218 int num_values = hweight64(supported_bits);
219
220 flags |= DRM_MODE_PROP_BITMASK;
221
222 property = drm_property_create(dev, flags, name, num_values);
223 if (!property)
224 return NULL;
225 for (i = 0; i < num_props; i++) {
226 if (!(supported_bits & (1ULL << props[i].type)))
227 continue;
228
229 ret = drm_property_add_enum(property,
230 props[i].type,
231 props[i].name);
232 if (ret) {
233 drm_property_destroy(dev, property);
234 return NULL;
235 }
236 }
237
238 return property;
239 }
240 EXPORT_SYMBOL(drm_property_create_bitmask);
241
242 static struct drm_property *property_create_range(struct drm_device *dev,
243 u32 flags, const char *name,
244 uint64_t min, uint64_t max)
245 {
246 struct drm_property *property;
247
248 property = drm_property_create(dev, flags, name, 2);
249 if (!property)
250 return NULL;
251
252 property->values[0] = min;
253 property->values[1] = max;
254
255 return property;
256 }
257
258 /**
259 * drm_property_create_range - create a new unsigned ranged property type
260 * @dev: drm device
261 * @flags: flags specifying the property type
262 * @name: name of the property
263 * @min: minimum value of the property
264 * @max: maximum value of the property
265 *
266 * This creates a new generic drm property which can then be attached to a drm
267 * object with drm_object_attach_property(). The returned property object must
268 * be freed with drm_property_destroy(), which is done automatically when
269 * calling drm_mode_config_cleanup().
270 *
271 * Userspace is allowed to set any unsigned integer value in the (min, max)
272 * range inclusive.
273 *
274 * Returns:
275 * A pointer to the newly created property on success, NULL on failure.
276 */
277 struct drm_property *drm_property_create_range(struct drm_device *dev,
278 u32 flags, const char *name,
279 uint64_t min, uint64_t max)
280 {
281 return property_create_range(dev, DRM_MODE_PROP_RANGE | flags,
282 name, min, max);
283 }
284 EXPORT_SYMBOL(drm_property_create_range);
285
286 /**
287 * drm_property_create_signed_range - create a new signed ranged property type
288 * @dev: drm device
289 * @flags: flags specifying the property type
290 * @name: name of the property
291 * @min: minimum value of the property
292 * @max: maximum value of the property
293 *
294 * This creates a new generic drm property which can then be attached to a drm
295 * object with drm_object_attach_property(). The returned property object must
296 * be freed with drm_property_destroy(), which is done automatically when
297 * calling drm_mode_config_cleanup().
298 *
299 * Userspace is allowed to set any signed integer value in the (min, max)
300 * range inclusive.
301 *
302 * Returns:
303 * A pointer to the newly created property on success, NULL on failure.
304 */
305 struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
306 u32 flags, const char *name,
307 int64_t min, int64_t max)
308 {
309 return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags,
310 name, I642U64(min), I642U64(max));
311 }
312 EXPORT_SYMBOL(drm_property_create_signed_range);
313
314 /**
315 * drm_property_create_object - create a new object property type
316 * @dev: drm device
317 * @flags: flags specifying the property type
318 * @name: name of the property
319 * @type: object type from DRM_MODE_OBJECT_* defines
320 *
321 * This creates a new generic drm property which can then be attached to a drm
322 * object with drm_object_attach_property(). The returned property object must
323 * be freed with drm_property_destroy(), which is done automatically when
324 * calling drm_mode_config_cleanup().
325 *
326 * Userspace is only allowed to set this to any property value of the given
327 * @type. Only useful for atomic properties, which is enforced.
328 *
329 * Returns:
330 * A pointer to the newly created property on success, NULL on failure.
331 */
332 struct drm_property *drm_property_create_object(struct drm_device *dev,
333 u32 flags, const char *name,
334 uint32_t type)
335 {
336 struct drm_property *property;
337
338 flags |= DRM_MODE_PROP_OBJECT;
339
340 if (WARN_ON(!(flags & DRM_MODE_PROP_ATOMIC)))
341 return NULL;
342
343 property = drm_property_create(dev, flags, name, 1);
344 if (!property)
345 return NULL;
346
347 property->values[0] = type;
348
349 return property;
350 }
351 EXPORT_SYMBOL(drm_property_create_object);
352
353 /**
354 * drm_property_create_bool - create a new boolean property type
355 * @dev: drm device
356 * @flags: flags specifying the property type
357 * @name: name of the property
358 *
359 * This creates a new generic drm property which can then be attached to a drm
360 * object with drm_object_attach_property(). The returned property object must
361 * be freed with drm_property_destroy(), which is done automatically when
362 * calling drm_mode_config_cleanup().
363 *
364 * This is implemented as a ranged property with only {0, 1} as valid values.
365 *
366 * Returns:
367 * A pointer to the newly created property on success, NULL on failure.
368 */
369 struct drm_property *drm_property_create_bool(struct drm_device *dev,
370 u32 flags, const char *name)
371 {
372 return drm_property_create_range(dev, flags, name, 0, 1);
373 }
374 EXPORT_SYMBOL(drm_property_create_bool);
375
376 /**
377 * drm_property_add_enum - add a possible value to an enumeration property
378 * @property: enumeration property to change
379 * @value: value of the new enumeration
380 * @name: symbolic name of the new enumeration
381 *
382 * This functions adds enumerations to a property.
383 *
384 * It's use is deprecated, drivers should use one of the more specific helpers
385 * to directly create the property with all enumerations already attached.
386 *
387 * Returns:
388 * Zero on success, error code on failure.
389 */
390 int drm_property_add_enum(struct drm_property *property,
391 uint64_t value, const char *name)
392 {
393 struct drm_property_enum *prop_enum;
394 int index = 0;
395
396 if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN))
397 return -EINVAL;
398
399 if (WARN_ON(!drm_property_type_is(property, DRM_MODE_PROP_ENUM) &&
400 !drm_property_type_is(property, DRM_MODE_PROP_BITMASK)))
401 return -EINVAL;
402
403 /*
404 * Bitmask enum properties have the additional constraint of values
405 * from 0 to 63
406 */
407 if (WARN_ON(drm_property_type_is(property, DRM_MODE_PROP_BITMASK) &&
408 value > 63))
409 return -EINVAL;
410
411 list_for_each_entry(prop_enum, &property->enum_list, head) {
412 if (WARN_ON(prop_enum->value == value))
413 return -EINVAL;
414 index++;
415 }
416
417 if (WARN_ON(index >= property->num_values))
418 return -EINVAL;
419
420 prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL);
421 if (!prop_enum)
422 return -ENOMEM;
423
424 strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN);
425 prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0';
426 prop_enum->value = value;
427
428 property->values[index] = value;
429 list_add_tail(&prop_enum->head, &property->enum_list);
430 return 0;
431 }
432 EXPORT_SYMBOL(drm_property_add_enum);
433
434 /**
435 * drm_property_destroy - destroy a drm property
436 * @dev: drm device
437 * @property: property to destry
438 *
439 * This function frees a property including any attached resources like
440 * enumeration values.
441 */
442 void drm_property_destroy(struct drm_device *dev, struct drm_property *property)
443 {
444 struct drm_property_enum *prop_enum, *pt;
445
446 list_for_each_entry_safe(prop_enum, pt, &property->enum_list, head) {
447 list_del(&prop_enum->head);
448 kfree(prop_enum);
449 }
450
451 if (property->num_values)
452 kfree(property->values);
453 drm_mode_object_unregister(dev, &property->base);
454 list_del(&property->head);
455 kfree(property);
456 }
457 EXPORT_SYMBOL(drm_property_destroy);
458
459 int drm_mode_getproperty_ioctl(struct drm_device *dev,
460 void *data, struct drm_file *file_priv)
461 {
462 struct drm_mode_get_property *out_resp = data;
463 struct drm_property *property;
464 int enum_count = 0;
465 int value_count = 0;
466 int i, copied;
467 struct drm_property_enum *prop_enum;
468 struct drm_mode_property_enum __user *enum_ptr;
469 uint64_t __user *values_ptr;
470
471 if (!drm_core_check_feature(dev, DRIVER_MODESET))
472 return -EOPNOTSUPP;
473
474 property = drm_property_find(dev, file_priv, out_resp->prop_id);
475 if (!property)
476 return -ENOENT;
477
478 strncpy(out_resp->name, property->name, DRM_PROP_NAME_LEN);
479 out_resp->name[DRM_PROP_NAME_LEN-1] = 0;
480 out_resp->flags = property->flags;
481
482 value_count = property->num_values;
483 values_ptr = u64_to_user_ptr(out_resp->values_ptr);
484
485 for (i = 0; i < value_count; i++) {
486 if (i < out_resp->count_values &&
487 put_user(property->values[i], values_ptr + i)) {
488 return -EFAULT;
489 }
490 }
491 out_resp->count_values = value_count;
492
493 copied = 0;
494 enum_ptr = u64_to_user_ptr(out_resp->enum_blob_ptr);
495
496 if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
497 drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
498 list_for_each_entry(prop_enum, &property->enum_list, head) {
499 enum_count++;
500 if (out_resp->count_enum_blobs < enum_count)
501 continue;
502
503 if (copy_to_user(&enum_ptr[copied].value,
504 &prop_enum->value, sizeof(uint64_t)))
505 return -EFAULT;
506
507 if (copy_to_user(&enum_ptr[copied].name,
508 &prop_enum->name, DRM_PROP_NAME_LEN))
509 return -EFAULT;
510 copied++;
511 }
512 out_resp->count_enum_blobs = enum_count;
513 }
514
515 /*
516 * NOTE: The idea seems to have been to use this to read all the blob
517 * property values. But nothing ever added them to the corresponding
518 * list, userspace always used the special-purpose get_blob ioctl to
519 * read the value for a blob property. It also doesn't make a lot of
520 * sense to return values here when everything else is just metadata for
521 * the property itself.
522 */
523 if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
524 out_resp->count_enum_blobs = 0;
525
526 return 0;
527 }
528
529 static void drm_property_free_blob(struct kref *kref)
530 {
531 struct drm_property_blob *blob =
532 container_of(kref, struct drm_property_blob, base.refcount);
533
534 mutex_lock(&blob->dev->mode_config.blob_lock);
535 list_del(&blob->head_global);
536 mutex_unlock(&blob->dev->mode_config.blob_lock);
537
538 drm_mode_object_unregister(blob->dev, &blob->base);
539
540 kvfree(blob);
541 }
542
543 /**
544 * drm_property_create_blob - Create new blob property
545 * @dev: DRM device to create property for
546 * @length: Length to allocate for blob data
547 * @data: If specified, copies data into blob
548 *
549 * Creates a new blob property for a specified DRM device, optionally
550 * copying data. Note that blob properties are meant to be invariant, hence the
551 * data must be filled out before the blob is used as the value of any property.
552 *
553 * Returns:
554 * New blob property with a single reference on success, or an ERR_PTR
555 * value on failure.
556 */
557 struct drm_property_blob *
558 drm_property_create_blob(struct drm_device *dev, size_t length,
559 const void *data)
560 {
561 struct drm_property_blob *blob;
562 int ret;
563
564 if (!length || length > INT_MAX - sizeof(struct drm_property_blob))
565 return ERR_PTR(-EINVAL);
566
567 blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
568 if (!blob)
569 return ERR_PTR(-ENOMEM);
570
571 /* This must be explicitly initialised, so we can safely call list_del
572 * on it in the removal handler, even if it isn't in a file list. */
573 INIT_LIST_HEAD(&blob->head_file);
574 blob->data = (void *)blob + sizeof(*blob);
575 blob->length = length;
576 blob->dev = dev;
577
578 if (data)
579 memcpy(blob->data, data, length);
580
581 ret = __drm_mode_object_add(dev, &blob->base, DRM_MODE_OBJECT_BLOB,
582 true, drm_property_free_blob);
583 if (ret) {
584 kvfree(blob);
585 return ERR_PTR(-EINVAL);
586 }
587
588 mutex_lock(&dev->mode_config.blob_lock);
589 list_add_tail(&blob->head_global,
590 &dev->mode_config.property_blob_list);
591 mutex_unlock(&dev->mode_config.blob_lock);
592
593 return blob;
594 }
595 EXPORT_SYMBOL(drm_property_create_blob);
596
597 /**
598 * drm_property_blob_put - release a blob property reference
599 * @blob: DRM blob property
600 *
601 * Releases a reference to a blob property. May free the object.
602 */
603 void drm_property_blob_put(struct drm_property_blob *blob)
604 {
605 if (!blob)
606 return;
607
608 drm_mode_object_put(&blob->base);
609 }
610 EXPORT_SYMBOL(drm_property_blob_put);
611
612 void drm_property_destroy_user_blobs(struct drm_device *dev,
613 struct drm_file *file_priv)
614 {
615 struct drm_property_blob *blob, *bt;
616
617 /*
618 * When the file gets released that means no one else can access the
619 * blob list any more, so no need to grab dev->blob_lock.
620 */
621 list_for_each_entry_safe(blob, bt, &file_priv->blobs, head_file) {
622 list_del_init(&blob->head_file);
623 drm_property_blob_put(blob);
624 }
625 }
626
627 /**
628 * drm_property_blob_get - acquire blob property reference
629 * @blob: DRM blob property
630 *
631 * Acquires a reference to an existing blob property. Returns @blob, which
632 * allows this to be used as a shorthand in assignments.
633 */
634 struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob)
635 {
636 drm_mode_object_get(&blob->base);
637 return blob;
638 }
639 EXPORT_SYMBOL(drm_property_blob_get);
640
641 /**
642 * drm_property_lookup_blob - look up a blob property and take a reference
643 * @dev: drm device
644 * @id: id of the blob property
645 *
646 * If successful, this takes an additional reference to the blob property.
647 * callers need to make sure to eventually unreference the returned property
648 * again, using drm_property_blob_put().
649 *
650 * Return:
651 * NULL on failure, pointer to the blob on success.
652 */
653 struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
654 uint32_t id)
655 {
656 struct drm_mode_object *obj;
657 struct drm_property_blob *blob = NULL;
658
659 obj = __drm_mode_object_find(dev, NULL, id, DRM_MODE_OBJECT_BLOB);
660 if (obj)
661 blob = obj_to_blob(obj);
662 return blob;
663 }
664 EXPORT_SYMBOL(drm_property_lookup_blob);
665
666 /**
667 * drm_property_replace_global_blob - replace existing blob property
668 * @dev: drm device
669 * @replace: location of blob property pointer to be replaced
670 * @length: length of data for new blob, or 0 for no data
671 * @data: content for new blob, or NULL for no data
672 * @obj_holds_id: optional object for property holding blob ID
673 * @prop_holds_id: optional property holding blob ID
674 * @return 0 on success or error on failure
675 *
676 * This function will replace a global property in the blob list, optionally
677 * updating a property which holds the ID of that property.
678 *
679 * If length is 0 or data is NULL, no new blob will be created, and the holding
680 * property, if specified, will be set to 0.
681 *
682 * Access to the replace pointer is assumed to be protected by the caller, e.g.
683 * by holding the relevant modesetting object lock for its parent.
684 *
685 * For example, a drm_connector has a 'PATH' property, which contains the ID
686 * of a blob property with the value of the MST path information. Calling this
687 * function with replace pointing to the connector's path_blob_ptr, length and
688 * data set for the new path information, obj_holds_id set to the connector's
689 * base object, and prop_holds_id set to the path property name, will perform
690 * a completely atomic update. The access to path_blob_ptr is protected by the
691 * caller holding a lock on the connector.
692 */
693 int drm_property_replace_global_blob(struct drm_device *dev,
694 struct drm_property_blob **replace,
695 size_t length,
696 const void *data,
697 struct drm_mode_object *obj_holds_id,
698 struct drm_property *prop_holds_id)
699 {
700 struct drm_property_blob *new_blob = NULL;
701 struct drm_property_blob *old_blob = NULL;
702 int ret;
703
704 WARN_ON(replace == NULL);
705
706 old_blob = *replace;
707
708 if (length && data) {
709 new_blob = drm_property_create_blob(dev, length, data);
710 if (IS_ERR(new_blob))
711 return PTR_ERR(new_blob);
712 }
713
714 if (obj_holds_id) {
715 ret = drm_object_property_set_value(obj_holds_id,
716 prop_holds_id,
717 new_blob ?
718 new_blob->base.id : 0);
719 if (ret != 0)
720 goto err_created;
721 }
722
723 drm_property_blob_put(old_blob);
724 *replace = new_blob;
725
726 return 0;
727
728 err_created:
729 drm_property_blob_put(new_blob);
730 return ret;
731 }
732 EXPORT_SYMBOL(drm_property_replace_global_blob);
733
734 /**
735 * drm_property_replace_blob - replace a blob property
736 * @blob: a pointer to the member blob to be replaced
737 * @new_blob: the new blob to replace with
738 *
739 * Return: true if the blob was in fact replaced.
740 */
741 bool drm_property_replace_blob(struct drm_property_blob **blob,
742 struct drm_property_blob *new_blob)
743 {
744 struct drm_property_blob *old_blob = *blob;
745
746 if (old_blob == new_blob)
747 return false;
748
749 drm_property_blob_put(old_blob);
750 if (new_blob)
751 drm_property_blob_get(new_blob);
752 *blob = new_blob;
753 return true;
754 }
755 EXPORT_SYMBOL(drm_property_replace_blob);
756
757 int drm_mode_getblob_ioctl(struct drm_device *dev,
758 void *data, struct drm_file *file_priv)
759 {
760 struct drm_mode_get_blob *out_resp = data;
761 struct drm_property_blob *blob;
762 int ret = 0;
763
764 if (!drm_core_check_feature(dev, DRIVER_MODESET))
765 return -EOPNOTSUPP;
766
767 blob = drm_property_lookup_blob(dev, out_resp->blob_id);
768 if (!blob)
769 return -ENOENT;
770
771 if (out_resp->length == blob->length) {
772 if (copy_to_user(u64_to_user_ptr(out_resp->data),
773 blob->data,
774 blob->length)) {
775 ret = -EFAULT;
776 goto unref;
777 }
778 }
779 out_resp->length = blob->length;
780 unref:
781 drm_property_blob_put(blob);
782
783 return ret;
784 }
785
786 int drm_mode_createblob_ioctl(struct drm_device *dev,
787 void *data, struct drm_file *file_priv)
788 {
789 struct drm_mode_create_blob *out_resp = data;
790 struct drm_property_blob *blob;
791 int ret = 0;
792
793 if (!drm_core_check_feature(dev, DRIVER_MODESET))
794 return -EOPNOTSUPP;
795
796 blob = drm_property_create_blob(dev, out_resp->length, NULL);
797 if (IS_ERR(blob))
798 return PTR_ERR(blob);
799
800 if (copy_from_user(blob->data,
801 u64_to_user_ptr(out_resp->data),
802 out_resp->length)) {
803 ret = -EFAULT;
804 goto out_blob;
805 }
806
807 /* Dropping the lock between create_blob and our access here is safe
808 * as only the same file_priv can remove the blob; at this point, it is
809 * not associated with any file_priv. */
810 mutex_lock(&dev->mode_config.blob_lock);
811 out_resp->blob_id = blob->base.id;
812 list_add_tail(&blob->head_file, &file_priv->blobs);
813 mutex_unlock(&dev->mode_config.blob_lock);
814
815 return 0;
816
817 out_blob:
818 drm_property_blob_put(blob);
819 return ret;
820 }
821
822 int drm_mode_destroyblob_ioctl(struct drm_device *dev,
823 void *data, struct drm_file *file_priv)
824 {
825 struct drm_mode_destroy_blob *out_resp = data;
826 struct drm_property_blob *blob = NULL, *bt;
827 bool found = false;
828 int ret = 0;
829
830 if (!drm_core_check_feature(dev, DRIVER_MODESET))
831 return -EOPNOTSUPP;
832
833 blob = drm_property_lookup_blob(dev, out_resp->blob_id);
834 if (!blob)
835 return -ENOENT;
836
837 mutex_lock(&dev->mode_config.blob_lock);
838 /* Ensure the property was actually created by this user. */
839 list_for_each_entry(bt, &file_priv->blobs, head_file) {
840 if (bt == blob) {
841 found = true;
842 break;
843 }
844 }
845
846 if (!found) {
847 ret = -EPERM;
848 goto err;
849 }
850
851 /* We must drop head_file here, because we may not be the last
852 * reference on the blob. */
853 list_del_init(&blob->head_file);
854 mutex_unlock(&dev->mode_config.blob_lock);
855
856 /* One reference from lookup, and one from the filp. */
857 drm_property_blob_put(blob);
858 drm_property_blob_put(blob);
859
860 return 0;
861
862 err:
863 mutex_unlock(&dev->mode_config.blob_lock);
864 drm_property_blob_put(blob);
865
866 return ret;
867 }
868
869 /* Some properties could refer to dynamic refcnt'd objects, or things that
870 * need special locking to handle lifetime issues (ie. to ensure the prop
871 * value doesn't become invalid part way through the property update due to
872 * race). The value returned by reference via 'obj' should be passed back
873 * to drm_property_change_valid_put() after the property is set (and the
874 * object to which the property is attached has a chance to take its own
875 * reference).
876 */
877 bool drm_property_change_valid_get(struct drm_property *property,
878 uint64_t value, struct drm_mode_object **ref)
879 {
880 int i;
881
882 if (property->flags & DRM_MODE_PROP_IMMUTABLE)
883 return false;
884
885 *ref = NULL;
886
887 if (drm_property_type_is(property, DRM_MODE_PROP_RANGE)) {
888 if (value < property->values[0] || value > property->values[1])
889 return false;
890 return true;
891 } else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) {
892 int64_t svalue = U642I64(value);
893
894 if (svalue < U642I64(property->values[0]) ||
895 svalue > U642I64(property->values[1]))
896 return false;
897 return true;
898 } else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
899 uint64_t valid_mask = 0;
900
901 for (i = 0; i < property->num_values; i++)
902 valid_mask |= (1ULL << property->values[i]);
903 return !(value & ~valid_mask);
904 } else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) {
905 struct drm_property_blob *blob;
906
907 if (value == 0)
908 return true;
909
910 blob = drm_property_lookup_blob(property->dev, value);
911 if (blob) {
912 *ref = &blob->base;
913 return true;
914 } else {
915 return false;
916 }
917 } else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
918 /* a zero value for an object property translates to null: */
919 if (value == 0)
920 return true;
921
922 *ref = __drm_mode_object_find(property->dev, NULL, value,
923 property->values[0]);
924 return *ref != NULL;
925 }
926
927 for (i = 0; i < property->num_values; i++)
928 if (property->values[i] == value)
929 return true;
930 return false;
931 }
932
933 void drm_property_change_valid_put(struct drm_property *property,
934 struct drm_mode_object *ref)
935 {
936 if (!ref)
937 return;
938
939 if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
940 drm_mode_object_put(ref);
941 } else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
942 drm_property_blob_put(obj_to_blob(ref));
943 }