2 * Copyright (c) 2016 Intel Corporation
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.
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
23 #include <linux/export.h>
24 #include <linux/uaccess.h>
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_print.h>
31 #include <drm/drm_property.h>
33 #include "drm_crtc_internal.h"
38 * Properties as represented by &drm_property are used to extend the modeset
39 * interface exposed to userspace. For the atomic modeset IOCTL properties are
40 * even the only way to transport metadata about the desired new modeset
41 * configuration from userspace to the kernel. Properties have a well-defined
42 * value range, which is enforced by the drm core. See the documentation of the
43 * flags member of &struct drm_property for an overview of the different
44 * property types and ranges.
46 * Properties don't store the current value directly, but need to be
47 * instantiated by attaching them to a &drm_mode_object with
48 * drm_object_attach_property().
50 * Property values are only 64bit. To support bigger piles of data (like gamma
51 * tables, color correction matrices or large structures) a property can instead
52 * point at a &drm_property_blob with that additional data.
54 * Properties are defined by their symbolic name, userspace must keep a
55 * per-object mapping from those names to the property ID used in the atomic
56 * IOCTL and in the get/set property IOCTL.
59 static bool drm_property_flags_valid(u32 flags)
61 u32 legacy_type = flags & DRM_MODE_PROP_LEGACY_TYPE;
62 u32 ext_type = flags & DRM_MODE_PROP_EXTENDED_TYPE;
64 /* Reject undefined/deprecated flags */
65 if (flags & ~(DRM_MODE_PROP_LEGACY_TYPE |
66 DRM_MODE_PROP_EXTENDED_TYPE |
67 DRM_MODE_PROP_IMMUTABLE |
68 DRM_MODE_PROP_ATOMIC))
71 /* We want either a legacy type or an extended type, but not both */
72 if (!legacy_type == !ext_type)
75 /* Only one legacy type at a time please */
76 if (legacy_type && !is_power_of_2(legacy_type))
83 * drm_property_create - create a new property type
85 * @flags: flags specifying the property type
86 * @name: name of the property
87 * @num_values: number of pre-defined values
89 * This creates a new generic drm property which can then be attached to a drm
90 * object with drm_object_attach_property(). The returned property object must
91 * be freed with drm_property_destroy(), which is done automatically when
92 * calling drm_mode_config_cleanup().
95 * A pointer to the newly created property on success, NULL on failure.
97 struct drm_property *drm_property_create(struct drm_device *dev,
98 u32 flags, const char *name,
101 struct drm_property *property = NULL;
104 if (WARN_ON(!drm_property_flags_valid(flags)))
107 if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN))
110 property = kzalloc(sizeof(struct drm_property), GFP_KERNEL);
117 property->values = kcalloc(num_values, sizeof(uint64_t),
119 if (!property->values)
123 ret = drm_mode_object_add(dev, &property->base, DRM_MODE_OBJECT_PROPERTY);
127 property->flags = flags;
128 property->num_values = num_values;
129 INIT_LIST_HEAD(&property->enum_list);
131 strscpy_pad(property->name, name, DRM_PROP_NAME_LEN);
133 list_add_tail(&property->head, &dev->mode_config.property_list);
137 kfree(property->values);
141 EXPORT_SYMBOL(drm_property_create);
144 * drm_property_create_enum - create a new enumeration property type
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
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().
156 * Userspace is only allowed to set one of the predefined values for enumeration
160 * A pointer to the newly created property on success, NULL on failure.
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,
167 struct drm_property *property;
170 flags |= DRM_MODE_PROP_ENUM;
172 property = drm_property_create(dev, flags, name, num_values);
176 for (i = 0; i < num_values; i++) {
177 ret = drm_property_add_enum(property,
181 drm_property_destroy(dev, property);
188 EXPORT_SYMBOL(drm_property_create_enum);
191 * drm_property_create_bitmask - create a new bitmask property type
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
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().
204 * Compared to plain enumeration properties userspace is allowed to set any
205 * or'ed together combination of the predefined property bitflag values
208 * A pointer to the newly created property on success, NULL on failure.
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,
214 uint64_t supported_bits)
216 struct drm_property *property;
218 int num_values = hweight64(supported_bits);
220 flags |= DRM_MODE_PROP_BITMASK;
222 property = drm_property_create(dev, flags, name, num_values);
225 for (i = 0; i < num_props; i++) {
226 if (!(supported_bits & (1ULL << props[i].type)))
229 ret = drm_property_add_enum(property,
233 drm_property_destroy(dev, property);
240 EXPORT_SYMBOL(drm_property_create_bitmask);
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)
246 struct drm_property *property;
248 property = drm_property_create(dev, flags, name, 2);
252 property->values[0] = min;
253 property->values[1] = max;
259 * drm_property_create_range - create a new unsigned ranged property type
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
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().
271 * Userspace is allowed to set any unsigned integer value in the (min, max)
275 * A pointer to the newly created property on success, NULL on failure.
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)
281 return property_create_range(dev, DRM_MODE_PROP_RANGE | flags,
284 EXPORT_SYMBOL(drm_property_create_range);
287 * drm_property_create_signed_range - create a new signed ranged property type
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
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().
299 * Userspace is allowed to set any signed integer value in the (min, max)
303 * A pointer to the newly created property on success, NULL on failure.
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)
309 return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags,
310 name, I642U64(min), I642U64(max));
312 EXPORT_SYMBOL(drm_property_create_signed_range);
315 * drm_property_create_object - create a new object property type
317 * @flags: flags specifying the property type
318 * @name: name of the property
319 * @type: object type from DRM_MODE_OBJECT_* defines
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().
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.
330 * A pointer to the newly created property on success, NULL on failure.
332 struct drm_property *drm_property_create_object(struct drm_device *dev,
333 u32 flags, const char *name,
336 struct drm_property *property;
338 flags |= DRM_MODE_PROP_OBJECT;
340 if (WARN_ON(!(flags & DRM_MODE_PROP_ATOMIC)))
343 property = drm_property_create(dev, flags, name, 1);
347 property->values[0] = type;
351 EXPORT_SYMBOL(drm_property_create_object);
354 * drm_property_create_bool - create a new boolean property type
356 * @flags: flags specifying the property type
357 * @name: name of the property
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().
364 * This is implemented as a ranged property with only {0, 1} as valid values.
367 * A pointer to the newly created property on success, NULL on failure.
369 struct drm_property *drm_property_create_bool(struct drm_device *dev,
370 u32 flags, const char *name)
372 return drm_property_create_range(dev, flags, name, 0, 1);
374 EXPORT_SYMBOL(drm_property_create_bool);
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
382 * This functions adds enumerations to a property.
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.
388 * Zero on success, error code on failure.
390 int drm_property_add_enum(struct drm_property *property,
391 uint64_t value, const char *name)
393 struct drm_property_enum *prop_enum;
396 if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN))
399 if (WARN_ON(!drm_property_type_is(property, DRM_MODE_PROP_ENUM) &&
400 !drm_property_type_is(property, DRM_MODE_PROP_BITMASK)))
404 * Bitmask enum properties have the additional constraint of values
407 if (WARN_ON(drm_property_type_is(property, DRM_MODE_PROP_BITMASK) &&
411 list_for_each_entry(prop_enum, &property->enum_list, head) {
412 if (WARN_ON(prop_enum->value == value))
417 if (WARN_ON(index >= property->num_values))
420 prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL);
424 strscpy_pad(prop_enum->name, name, DRM_PROP_NAME_LEN);
425 prop_enum->value = value;
427 property->values[index] = value;
428 list_add_tail(&prop_enum->head, &property->enum_list);
431 EXPORT_SYMBOL(drm_property_add_enum);
434 * drm_property_destroy - destroy a drm property
436 * @property: property to destroy
438 * This function frees a property including any attached resources like
439 * enumeration values.
441 void drm_property_destroy(struct drm_device *dev, struct drm_property *property)
443 struct drm_property_enum *prop_enum, *pt;
445 list_for_each_entry_safe(prop_enum, pt, &property->enum_list, head) {
446 list_del(&prop_enum->head);
450 if (property->num_values)
451 kfree(property->values);
452 drm_mode_object_unregister(dev, &property->base);
453 list_del(&property->head);
456 EXPORT_SYMBOL(drm_property_destroy);
458 int drm_mode_getproperty_ioctl(struct drm_device *dev,
459 void *data, struct drm_file *file_priv)
461 struct drm_mode_get_property *out_resp = data;
462 struct drm_property *property;
466 struct drm_property_enum *prop_enum;
467 struct drm_mode_property_enum __user *enum_ptr;
468 uint64_t __user *values_ptr;
470 if (!drm_core_check_feature(dev, DRIVER_MODESET))
473 property = drm_property_find(dev, file_priv, out_resp->prop_id);
477 strscpy_pad(out_resp->name, property->name, DRM_PROP_NAME_LEN);
478 out_resp->flags = property->flags;
480 value_count = property->num_values;
481 values_ptr = u64_to_user_ptr(out_resp->values_ptr);
483 for (i = 0; i < value_count; i++) {
484 if (i < out_resp->count_values &&
485 put_user(property->values[i], values_ptr + i)) {
489 out_resp->count_values = value_count;
492 enum_ptr = u64_to_user_ptr(out_resp->enum_blob_ptr);
494 if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
495 drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
496 list_for_each_entry(prop_enum, &property->enum_list, head) {
498 if (out_resp->count_enum_blobs < enum_count)
501 if (copy_to_user(&enum_ptr[copied].value,
502 &prop_enum->value, sizeof(uint64_t)))
505 if (copy_to_user(&enum_ptr[copied].name,
506 &prop_enum->name, DRM_PROP_NAME_LEN))
510 out_resp->count_enum_blobs = enum_count;
514 * NOTE: The idea seems to have been to use this to read all the blob
515 * property values. But nothing ever added them to the corresponding
516 * list, userspace always used the special-purpose get_blob ioctl to
517 * read the value for a blob property. It also doesn't make a lot of
518 * sense to return values here when everything else is just metadata for
519 * the property itself.
521 if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
522 out_resp->count_enum_blobs = 0;
527 static void drm_property_free_blob(struct kref *kref)
529 struct drm_property_blob *blob =
530 container_of(kref, struct drm_property_blob, base.refcount);
532 mutex_lock(&blob->dev->mode_config.blob_lock);
533 list_del(&blob->head_global);
534 mutex_unlock(&blob->dev->mode_config.blob_lock);
536 drm_mode_object_unregister(blob->dev, &blob->base);
542 * drm_property_create_blob - Create new blob property
543 * @dev: DRM device to create property for
544 * @length: Length to allocate for blob data
545 * @data: If specified, copies data into blob
547 * Creates a new blob property for a specified DRM device, optionally
548 * copying data. Note that blob properties are meant to be invariant, hence the
549 * data must be filled out before the blob is used as the value of any property.
552 * New blob property with a single reference on success, or an ERR_PTR
555 struct drm_property_blob *
556 drm_property_create_blob(struct drm_device *dev, size_t length,
559 struct drm_property_blob *blob;
562 if (!length || length > INT_MAX - sizeof(struct drm_property_blob))
563 return ERR_PTR(-EINVAL);
565 blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
567 return ERR_PTR(-ENOMEM);
569 /* This must be explicitly initialised, so we can safely call list_del
570 * on it in the removal handler, even if it isn't in a file list. */
571 INIT_LIST_HEAD(&blob->head_file);
572 blob->data = (void *)blob + sizeof(*blob);
573 blob->length = length;
577 memcpy(blob->data, data, length);
579 ret = __drm_mode_object_add(dev, &blob->base, DRM_MODE_OBJECT_BLOB,
580 true, drm_property_free_blob);
583 return ERR_PTR(-EINVAL);
586 mutex_lock(&dev->mode_config.blob_lock);
587 list_add_tail(&blob->head_global,
588 &dev->mode_config.property_blob_list);
589 mutex_unlock(&dev->mode_config.blob_lock);
593 EXPORT_SYMBOL(drm_property_create_blob);
596 * drm_property_blob_put - release a blob property reference
597 * @blob: DRM blob property
599 * Releases a reference to a blob property. May free the object.
601 void drm_property_blob_put(struct drm_property_blob *blob)
606 drm_mode_object_put(&blob->base);
608 EXPORT_SYMBOL(drm_property_blob_put);
610 void drm_property_destroy_user_blobs(struct drm_device *dev,
611 struct drm_file *file_priv)
613 struct drm_property_blob *blob, *bt;
616 * When the file gets released that means no one else can access the
617 * blob list any more, so no need to grab dev->blob_lock.
619 list_for_each_entry_safe(blob, bt, &file_priv->blobs, head_file) {
620 list_del_init(&blob->head_file);
621 drm_property_blob_put(blob);
626 * drm_property_blob_get - acquire blob property reference
627 * @blob: DRM blob property
629 * Acquires a reference to an existing blob property. Returns @blob, which
630 * allows this to be used as a shorthand in assignments.
632 struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob)
634 drm_mode_object_get(&blob->base);
637 EXPORT_SYMBOL(drm_property_blob_get);
640 * drm_property_lookup_blob - look up a blob property and take a reference
642 * @id: id of the blob property
644 * If successful, this takes an additional reference to the blob property.
645 * callers need to make sure to eventually unreferenced the returned property
646 * again, using drm_property_blob_put().
649 * NULL on failure, pointer to the blob on success.
651 struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
654 struct drm_mode_object *obj;
655 struct drm_property_blob *blob = NULL;
657 obj = __drm_mode_object_find(dev, NULL, id, DRM_MODE_OBJECT_BLOB);
659 blob = obj_to_blob(obj);
662 EXPORT_SYMBOL(drm_property_lookup_blob);
665 * drm_property_replace_global_blob - replace existing blob property
667 * @replace: location of blob property pointer to be replaced
668 * @length: length of data for new blob, or 0 for no data
669 * @data: content for new blob, or NULL for no data
670 * @obj_holds_id: optional object for property holding blob ID
671 * @prop_holds_id: optional property holding blob ID
672 * @return 0 on success or error on failure
674 * This function will replace a global property in the blob list, optionally
675 * updating a property which holds the ID of that property.
677 * If length is 0 or data is NULL, no new blob will be created, and the holding
678 * property, if specified, will be set to 0.
680 * Access to the replace pointer is assumed to be protected by the caller, e.g.
681 * by holding the relevant modesetting object lock for its parent.
683 * For example, a drm_connector has a 'PATH' property, which contains the ID
684 * of a blob property with the value of the MST path information. Calling this
685 * function with replace pointing to the connector's path_blob_ptr, length and
686 * data set for the new path information, obj_holds_id set to the connector's
687 * base object, and prop_holds_id set to the path property name, will perform
688 * a completely atomic update. The access to path_blob_ptr is protected by the
689 * caller holding a lock on the connector.
691 int drm_property_replace_global_blob(struct drm_device *dev,
692 struct drm_property_blob **replace,
695 struct drm_mode_object *obj_holds_id,
696 struct drm_property *prop_holds_id)
698 struct drm_property_blob *new_blob = NULL;
699 struct drm_property_blob *old_blob = NULL;
702 WARN_ON(replace == NULL);
706 if (length && data) {
707 new_blob = drm_property_create_blob(dev, length, data);
708 if (IS_ERR(new_blob))
709 return PTR_ERR(new_blob);
713 ret = drm_object_property_set_value(obj_holds_id,
716 new_blob->base.id : 0);
721 drm_property_blob_put(old_blob);
727 drm_property_blob_put(new_blob);
730 EXPORT_SYMBOL(drm_property_replace_global_blob);
733 * drm_property_replace_blob - replace a blob property
734 * @blob: a pointer to the member blob to be replaced
735 * @new_blob: the new blob to replace with
737 * Return: true if the blob was in fact replaced.
739 bool drm_property_replace_blob(struct drm_property_blob **blob,
740 struct drm_property_blob *new_blob)
742 struct drm_property_blob *old_blob = *blob;
744 if (old_blob == new_blob)
747 drm_property_blob_put(old_blob);
749 drm_property_blob_get(new_blob);
753 EXPORT_SYMBOL(drm_property_replace_blob);
756 * drm_property_replace_blob_from_id - replace a blob property taking a reference
758 * @blob: a pointer to the member blob to be replaced
759 * @blob_id: the id of the new blob to replace with
760 * @expected_size: expected size of the blob property
761 * @expected_elem_size: expected size of an element in the blob property
762 * @replaced: if the blob was in fact replaced
764 * Look up the new blob from id, take its reference, check expected sizes of
765 * the blob and its element and replace the old blob by the new one. Advertise
766 * if the replacement operation was successful.
768 * Return: true if the blob was in fact replaced. -EINVAL if the new blob was
769 * not found or sizes don't match.
771 int drm_property_replace_blob_from_id(struct drm_device *dev,
772 struct drm_property_blob **blob,
774 ssize_t expected_size,
775 ssize_t expected_elem_size,
778 struct drm_property_blob *new_blob = NULL;
781 new_blob = drm_property_lookup_blob(dev, blob_id);
782 if (new_blob == NULL) {
784 "cannot find blob ID %llu\n", blob_id);
788 if (expected_size > 0 &&
789 new_blob->length != expected_size) {
791 "[BLOB:%d] length %zu different from expected %zu\n",
792 new_blob->base.id, new_blob->length, expected_size);
793 drm_property_blob_put(new_blob);
796 if (expected_elem_size > 0 &&
797 new_blob->length % expected_elem_size != 0) {
799 "[BLOB:%d] length %zu not divisible by element size %zu\n",
800 new_blob->base.id, new_blob->length, expected_elem_size);
801 drm_property_blob_put(new_blob);
806 *replaced |= drm_property_replace_blob(blob, new_blob);
807 drm_property_blob_put(new_blob);
811 EXPORT_SYMBOL(drm_property_replace_blob_from_id);
813 int drm_mode_getblob_ioctl(struct drm_device *dev,
814 void *data, struct drm_file *file_priv)
816 struct drm_mode_get_blob *out_resp = data;
817 struct drm_property_blob *blob;
820 if (!drm_core_check_feature(dev, DRIVER_MODESET))
823 blob = drm_property_lookup_blob(dev, out_resp->blob_id);
827 if (out_resp->length == blob->length) {
828 if (copy_to_user(u64_to_user_ptr(out_resp->data),
835 out_resp->length = blob->length;
837 drm_property_blob_put(blob);
842 int drm_mode_createblob_ioctl(struct drm_device *dev,
843 void *data, struct drm_file *file_priv)
845 struct drm_mode_create_blob *out_resp = data;
846 struct drm_property_blob *blob;
849 if (!drm_core_check_feature(dev, DRIVER_MODESET))
852 blob = drm_property_create_blob(dev, out_resp->length, NULL);
854 return PTR_ERR(blob);
856 if (copy_from_user(blob->data,
857 u64_to_user_ptr(out_resp->data),
863 /* Dropping the lock between create_blob and our access here is safe
864 * as only the same file_priv can remove the blob; at this point, it is
865 * not associated with any file_priv. */
866 mutex_lock(&dev->mode_config.blob_lock);
867 out_resp->blob_id = blob->base.id;
868 list_add_tail(&blob->head_file, &file_priv->blobs);
869 mutex_unlock(&dev->mode_config.blob_lock);
874 drm_property_blob_put(blob);
878 int drm_mode_destroyblob_ioctl(struct drm_device *dev,
879 void *data, struct drm_file *file_priv)
881 struct drm_mode_destroy_blob *out_resp = data;
882 struct drm_property_blob *blob = NULL, *bt;
886 if (!drm_core_check_feature(dev, DRIVER_MODESET))
889 blob = drm_property_lookup_blob(dev, out_resp->blob_id);
893 mutex_lock(&dev->mode_config.blob_lock);
894 /* Ensure the property was actually created by this user. */
895 list_for_each_entry(bt, &file_priv->blobs, head_file) {
907 /* We must drop head_file here, because we may not be the last
908 * reference on the blob. */
909 list_del_init(&blob->head_file);
910 mutex_unlock(&dev->mode_config.blob_lock);
912 /* One reference from lookup, and one from the filp. */
913 drm_property_blob_put(blob);
914 drm_property_blob_put(blob);
919 mutex_unlock(&dev->mode_config.blob_lock);
920 drm_property_blob_put(blob);
925 /* Some properties could refer to dynamic refcnt'd objects, or things that
926 * need special locking to handle lifetime issues (ie. to ensure the prop
927 * value doesn't become invalid part way through the property update due to
928 * race). The value returned by reference via 'obj' should be passed back
929 * to drm_property_change_valid_put() after the property is set (and the
930 * object to which the property is attached has a chance to take its own
933 bool drm_property_change_valid_get(struct drm_property *property,
934 uint64_t value, struct drm_mode_object **ref)
938 if (property->flags & DRM_MODE_PROP_IMMUTABLE)
943 if (drm_property_type_is(property, DRM_MODE_PROP_RANGE)) {
944 if (value < property->values[0] || value > property->values[1])
947 } else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) {
948 int64_t svalue = U642I64(value);
950 if (svalue < U642I64(property->values[0]) ||
951 svalue > U642I64(property->values[1]))
954 } else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
955 uint64_t valid_mask = 0;
957 for (i = 0; i < property->num_values; i++)
958 valid_mask |= (1ULL << property->values[i]);
959 return !(value & ~valid_mask);
960 } else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) {
961 struct drm_property_blob *blob;
966 blob = drm_property_lookup_blob(property->dev, value);
973 } else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
974 /* a zero value for an object property translates to null: */
978 *ref = __drm_mode_object_find(property->dev, NULL, value,
979 property->values[0]);
983 for (i = 0; i < property->num_values; i++)
984 if (property->values[i] == value)
989 void drm_property_change_valid_put(struct drm_property *property,
990 struct drm_mode_object *ref)
995 if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
996 drm_mode_object_put(ref);
997 } else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
998 drm_property_blob_put(obj_to_blob(ref));