/*
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_property.h>
#include "drm_crtc_internal.h"
/**
* DOC: overview
*
* Properties as represented by &drm_property are used to extend the modeset
* interface exposed to userspace. For the atomic modeset IOCTL properties are
* even the only way to transport metadata about the desired new modeset
* configuration from userspace to the kernel. Properties have a well-defined
* value range, which is enforced by the drm core. See the documentation of the
* flags member of struct &drm_property for an overview of the different
* property types and ranges.
*
* Properties don't store the current value directly, but need to be
* instatiated by attaching them to a &drm_mode_object with
* drm_object_attach_property().
*
* Property values are only 64bit. To support bigger piles of data (like gamma
* tables, color correction matrizes or large structures) a property can instead
* point at a &drm_property_blob with that additional data
*
* Properties are defined by their symbolic name, userspace must keep a
* per-object mapping from those names to the property ID used in the atomic
* IOCTL and in the get/set property IOCTL.
*/
static bool drm_property_type_valid(struct drm_property *property)
{
if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
return !(property->flags & DRM_MODE_PROP_LEGACY_TYPE);
return !!(property->flags & DRM_MODE_PROP_LEGACY_TYPE);
}
/**
* drm_property_create - create a new property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
* @num_values: number of pre-defined values
*
* This creates a new generic drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create(struct drm_device *dev, int flags,
const char *name, int num_values)
{
struct drm_property *property = NULL;
int ret;
property = kzalloc(sizeof(struct drm_property), GFP_KERNEL);
if (!property)
return NULL;
property->dev = dev;
if (num_values) {
property->values = kcalloc(num_values, sizeof(uint64_t),
GFP_KERNEL);
if (!property->values)
goto fail;
}
ret = drm_mode_object_get(dev, &property->base, DRM_MODE_OBJECT_PROPERTY);
if (ret)
goto fail;
property->flags = flags;
property->num_values = num_values;
INIT_LIST_HEAD(&property->enum_list);
if (name) {
strncpy(property->name, name, DRM_PROP_NAME_LEN);
property->name[DRM_PROP_NAME_LEN-1] = '\0';
}
list_add_tail(&property->head, &dev->mode_config.property_list);
WARN_ON(!drm_property_type_valid(property));
return property;
fail:
kfree(property->values);
kfree(property);
return NULL;
}
EXPORT_SYMBOL(drm_property_create);
/**
* drm_property_create_enum - create a new enumeration property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
* @props: enumeration lists with property values
* @num_values: number of pre-defined values
*
* This creates a new generic drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* Userspace is only allowed to set one of the predefined values for enumeration
* properties.
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,
const char *name,
const struct drm_prop_enum_list *props,
int num_values)
{
struct drm_property *property;
int i, ret;
flags |= DRM_MODE_PROP_ENUM;
property = drm_property_create(dev, flags, name, num_values);
if (!property)
return NULL;
for (i = 0; i < num_values; i++) {
ret = drm_property_add_enum(property, i,
props[i].type,
props[i].name);
if (ret) {
drm_property_destroy(dev, property);
return NULL;
}
}
return property;
}
EXPORT_SYMBOL(drm_property_create_enum);
/**
* drm_property_create_bitmask - create a new bitmask property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
* @props: enumeration lists with property bitflags
* @num_props: size of the @props array
* @supported_bits: bitmask of all supported enumeration values
*
* This creates a new bitmask drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* Compared to plain enumeration properties userspace is allowed to set any
* or'ed together combination of the predefined property bitflag values
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
int flags, const char *name,
const struct drm_prop_enum_list *props,
int num_props,
uint64_t supported_bits)
{
struct drm_property *property;
int i, ret, index = 0;
int num_values = hweight64(supported_bits);
flags |= DRM_MODE_PROP_BITMASK;
property = drm_property_create(dev, flags, name, num_values);
if (!property)
return NULL;
for (i = 0; i < num_props; i++) {
if (!(supported_bits & (1ULL << props[i].type)))
continue;
if (WARN_ON(index >= num_values)) {
drm_property_destroy(dev, property);
return NULL;
}
ret = drm_property_add_enum(property, index++,
props[i].type,
props[i].name);
if (ret) {
drm_property_destroy(dev, property);
return NULL;
}
}
return property;
}
EXPORT_SYMBOL(drm_property_create_bitmask);
static struct drm_property *property_create_range(struct drm_device *dev,
int flags, const char *name,
uint64_t min, uint64_t max)
{
struct drm_property *property;
property = drm_property_create(dev, flags, name, 2);
if (!property)
return NULL;
property->values[0] = min;
property->values[1] = max;
return property;
}
/**
* drm_property_create_range - create a new unsigned ranged property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
* @min: minimum value of the property
* @max: maximum value of the property
*
* This creates a new generic drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* Userspace is allowed to set any unsigned integer value in the (min, max)
* range inclusive.
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
const char *name,
uint64_t min, uint64_t max)
{
return property_create_range(dev, DRM_MODE_PROP_RANGE | flags,
name, min, max);
}
EXPORT_SYMBOL(drm_property_create_range);
/**
* drm_property_create_signed_range - create a new signed ranged property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
* @min: minimum value of the property
* @max: maximum value of the property
*
* This creates a new generic drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* Userspace is allowed to set any signed integer value in the (min, max)
* range inclusive.
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
int flags, const char *name,
int64_t min, int64_t max)
{
return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags,
name, I642U64(min), I642U64(max));
}
EXPORT_SYMBOL(drm_property_create_signed_range);
/**
* drm_property_create_object - create a new object property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
* @type: object type from DRM_MODE_OBJECT_* defines
*
* This creates a new generic drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* Userspace is only allowed to set this to any property value of the given
* @type. Only useful for atomic properties, which is enforced.
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create_object(struct drm_device *dev,
int flags, const char *name,
uint32_t type)
{
struct drm_property *property;
flags |= DRM_MODE_PROP_OBJECT;
if (WARN_ON(!(flags & DRM_MODE_PROP_ATOMIC)))
return NULL;
property = drm_property_create(dev, flags, name, 1);
if (!property)
return NULL;
property->values[0] = type;
return property;
}
EXPORT_SYMBOL(drm_property_create_object);
/**
* drm_property_create_bool - create a new boolean property type
* @dev: drm device
* @flags: flags specifying the property type
* @name: name of the property
*
* This creates a new generic drm property which can then be attached to a drm
* object with drm_object_attach_property. The returned property object must be
* freed with drm_property_destroy(), which is done automatically when calling
* drm_mode_config_cleanup().
*
* This is implemented as a ranged property with only {0, 1} as valid values.
*
* Returns:
* A pointer to the newly created property on success, NULL on failure.
*/
struct drm_property *drm_property_create_bool(struct drm_device *dev, int flags,
const char *name)
{
return drm_property_create_range(dev, flags, name, 0, 1);
}
EXPORT_SYMBOL(drm_property_create_bool);
/**
* drm_property_add_enum - add a possible value to an enumeration property
* @property: enumeration property to change
* @index: index of the new enumeration
* @value: value of the new enumeration
* @name: symbolic name of the new enumeration
*
* This functions adds enumerations to a property.
*
* It's use is deprecated, drivers should use one of the more specific helpers
* to directly create the property with all enumerations already attached.
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_property_add_enum(struct drm_property *property, int index,
uint64_t value, const char *name)
{
struct drm_property_enum *prop_enum;
if (!(drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
drm_property_type_is(property, DRM_MODE_PROP_BITMASK)))
return -EINVAL;
/*
* Bitmask enum properties have the additional constraint of values
* from 0 to 63
*/
if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK) &&
(value > 63))
return -EINVAL;
if (!list_empty(&property->enum_list)) {
list_for_each_entry(prop_enum, &property->enum_list, head) {
if (prop_enum->value == value) {
strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN);
prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0';
return 0;
}
}
}
prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL);
if (!prop_enum)
return -ENOMEM;
strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN);
prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0';
prop_enum->value = value;
property->values[index] = value;
list_add_tail(&prop_enum->head, &property->enum_list);
return 0;
}
EXPORT_SYMBOL(drm_property_add_enum);
/**
* drm_property_destroy - destroy a drm property
* @dev: drm device
* @property: property to destry
*
* This function frees a property including any attached resources like
* enumeration values.
*/
void drm_property_destroy(struct drm_device *dev, struct drm_property *property)
{
struct drm_property_enum *prop_enum, *pt;
list_for_each_entry_safe(prop_enum, pt, &property->enum_list, head) {
list_del(&prop_enum->head);
kfree(prop_enum);
}
if (property->num_values)
kfree(property->values);
drm_mode_object_unregister(dev, &property->base);
list_del(&property->head);
kfree(property);
}
EXPORT_SYMBOL(drm_property_destroy);
int drm_mode_getproperty_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_get_property *out_resp = data;
struct drm_property *property;
int enum_count = 0;
int value_count = 0;
int ret = 0, i;
int copied;
struct drm_property_enum *prop_enum;
struct drm_mode_property_enum __user *enum_ptr;
uint64_t __user *values_ptr;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
drm_modeset_lock_all(dev);
property = drm_property_find(dev, out_resp->prop_id);
if (!property) {
ret = -ENOENT;
goto done;
}
if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
list_for_each_entry(prop_enum, &property->enum_list, head)
enum_count++;
}
value_count = property->num_values;
strncpy(out_resp->name, property->name, DRM_PROP_NAME_LEN);
out_resp->name[DRM_PROP_NAME_LEN-1] = 0;
out_resp->flags = property->flags;
if ((out_resp->count_values >= value_count) && value_count) {
values_ptr = (uint64_t __user *)(unsigned long)out_resp->values_ptr;
for (i = 0; i < value_count; i++) {
if (copy_to_user(values_ptr + i, &property->values[i], sizeof(uint64_t))) {
ret = -EFAULT;
goto done;
}
}
}
out_resp->count_values = value_count;
if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) ||
drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
if ((out_resp->count_enum_blobs >= enum_count) && enum_count) {
copied = 0;
enum_ptr = (struct drm_mode_property_enum __user *)(unsigned long)out_resp->enum_blob_ptr;
list_for_each_entry(prop_enum, &property->enum_list, head) {
if (copy_to_user(&enum_ptr[copied].value, &prop_enum->value, sizeof(uint64_t))) {
ret = -EFAULT;
goto done;
}
if (copy_to_user(&enum_ptr[copied].name,
&prop_enum->name, DRM_PROP_NAME_LEN)) {
ret = -EFAULT;
goto done;
}
copied++;
}
}
out_resp->count_enum_blobs = enum_count;
}
/*
* NOTE: The idea seems to have been to use this to read all the blob
* property values. But nothing ever added them to the corresponding
* list, userspace always used the special-purpose get_blob ioctl to
* read the value for a blob property. It also doesn't make a lot of
* sense to return values here when everything else is just metadata for
* the property itself.
*/
if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
out_resp->count_enum_blobs = 0;
done:
drm_modeset_unlock_all(dev);
return ret;
}
static void drm_property_free_blob(struct kref *kref)
{
struct drm_property_blob *blob =
container_of(kref, struct drm_property_blob, base.refcount);
mutex_lock(&blob->dev->mode_config.blob_lock);
list_del(&blob->head_global);
mutex_unlock(&blob->dev->mode_config.blob_lock);
drm_mode_object_unregister(blob->dev, &blob->base);
kfree(blob);
}
/**
* drm_property_create_blob - Create new blob property
* @dev: DRM device to create property for
* @length: Length to allocate for blob data
* @data: If specified, copies data into blob
*
* Creates a new blob property for a specified DRM device, optionally
* copying data. Note that blob properties are meant to be invariant, hence the
* data must be filled out before the blob is used as the value of any property.
*
* Returns:
* New blob property with a single reference on success, or an ERR_PTR
* value on failure.
*/
struct drm_property_blob *
drm_property_create_blob(struct drm_device *dev, size_t length,
const void *data)
{
struct drm_property_blob *blob;
int ret;
if (!length || length > ULONG_MAX - sizeof(struct drm_property_blob))
return ERR_PTR(-EINVAL);
blob = kzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL);
if (!blob)
return ERR_PTR(-ENOMEM);
/* This must be explicitly initialised, so we can safely call list_del
* on it in the removal handler, even if it isn't in a file list. */
INIT_LIST_HEAD(&blob->head_file);
blob->length = length;
blob->dev = dev;
if (data)
memcpy(blob->data, data, length);
ret = drm_mode_object_get_reg(dev, &blob->base, DRM_MODE_OBJECT_BLOB,
true, drm_property_free_blob);
if (ret) {
kfree(blob);
return ERR_PTR(-EINVAL);
}
mutex_lock(&dev->mode_config.blob_lock);
list_add_tail(&blob->head_global,
&dev->mode_config.property_blob_list);
mutex_unlock(&dev->mode_config.blob_lock);
return blob;
}
EXPORT_SYMBOL(drm_property_create_blob);
/**
* drm_property_unreference_blob - Unreference a blob property
* @blob: Pointer to blob property
*
* Drop a reference on a blob property. May free the object.
*/
void drm_property_unreference_blob(struct drm_property_blob *blob)
{
if (!blob)
return;
drm_mode_object_unreference(&blob->base);
}
EXPORT_SYMBOL(drm_property_unreference_blob);
void drm_property_destroy_user_blobs(struct drm_device *dev,
struct drm_file *file_priv)
{
struct drm_property_blob *blob, *bt;
/*
* When the file gets released that means no one else can access the
* blob list any more, so no need to grab dev->blob_lock.
*/
list_for_each_entry_safe(blob, bt, &file_priv->blobs, head_file) {
list_del_init(&blob->head_file);
drm_property_unreference_blob(blob);
}
}
/**
* drm_property_reference_blob - Take a reference on an existing property
* @blob: Pointer to blob property
*
* Take a new reference on an existing blob property. Returns @blob, which
* allows this to be used as a shorthand in assignments.
*/
struct drm_property_blob *drm_property_reference_blob(struct drm_property_blob *blob)
{
drm_mode_object_reference(&blob->base);
return blob;
}
EXPORT_SYMBOL(drm_property_reference_blob);
/**
* drm_property_lookup_blob - look up a blob property and take a reference
* @dev: drm device
* @id: id of the blob property
*
* If successful, this takes an additional reference to the blob property.
* callers need to make sure to eventually unreference the returned property
* again, using @drm_property_unreference_blob.
*
* Return:
* NULL on failure, pointer to the blob on success.
*/
struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
uint32_t id)
{
struct drm_mode_object *obj;
struct drm_property_blob *blob = NULL;
obj = __drm_mode_object_find(dev, id, DRM_MODE_OBJECT_BLOB);
if (obj)
blob = obj_to_blob(obj);
return blob;
}
EXPORT_SYMBOL(drm_property_lookup_blob);
/**
* drm_property_replace_global_blob - replace existing blob property
* @dev: drm device
* @replace: location of blob property pointer to be replaced
* @length: length of data for new blob, or 0 for no data
* @data: content for new blob, or NULL for no data
* @obj_holds_id: optional object for property holding blob ID
* @prop_holds_id: optional property holding blob ID
* @return 0 on success or error on failure
*
* This function will replace a global property in the blob list, optionally
* updating a property which holds the ID of that property.
*
* If length is 0 or data is NULL, no new blob will be created, and the holding
* property, if specified, will be set to 0.
*
* Access to the replace pointer is assumed to be protected by the caller, e.g.
* by holding the relevant modesetting object lock for its parent.
*
* For example, a drm_connector has a 'PATH' property, which contains the ID
* of a blob property with the value of the MST path information. Calling this
* function with replace pointing to the connector's path_blob_ptr, length and
* data set for the new path information, obj_holds_id set to the connector's
* base object, and prop_holds_id set to the path property name, will perform
* a completely atomic update. The access to path_blob_ptr is protected by the
* caller holding a lock on the connector.
*/
int drm_property_replace_global_blob(struct drm_device *dev,
struct drm_property_blob **replace,
size_t length,
const void *data,
struct drm_mode_object *obj_holds_id,
struct drm_property *prop_holds_id)
{
struct drm_property_blob *new_blob = NULL;
struct drm_property_blob *old_blob = NULL;
int ret;
WARN_ON(replace == NULL);
old_blob = *replace;
if (length && data) {
new_blob = drm_property_create_blob(dev, length, data);
if (IS_ERR(new_blob))
return PTR_ERR(new_blob);
}
if (obj_holds_id) {
ret = drm_object_property_set_value(obj_holds_id,
prop_holds_id,
new_blob ?
new_blob->base.id : 0);
if (ret != 0)
goto err_created;
}
drm_property_unreference_blob(old_blob);
*replace = new_blob;
return 0;
err_created:
drm_property_unreference_blob(new_blob);
return ret;
}
EXPORT_SYMBOL(drm_property_replace_global_blob);
int drm_mode_getblob_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_get_blob *out_resp = data;
struct drm_property_blob *blob;
int ret = 0;
void __user *blob_ptr;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
blob = drm_property_lookup_blob(dev, out_resp->blob_id);
if (!blob)
return -ENOENT;
if (out_resp->length == blob->length) {
blob_ptr = (void __user *)(unsigned long)out_resp->data;
if (copy_to_user(blob_ptr, blob->data, blob->length)) {
ret = -EFAULT;
goto unref;
}
}
out_resp->length = blob->length;
unref:
drm_property_unreference_blob(blob);
return ret;
}
int drm_mode_createblob_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_create_blob *out_resp = data;
struct drm_property_blob *blob;
void __user *blob_ptr;
int ret = 0;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
blob = drm_property_create_blob(dev, out_resp->length, NULL);
if (IS_ERR(blob))
return PTR_ERR(blob);
blob_ptr = (void __user *)(unsigned long)out_resp->data;
if (copy_from_user(blob->data, blob_ptr, out_resp->length)) {
ret = -EFAULT;
goto out_blob;
}
/* Dropping the lock between create_blob and our access here is safe
* as only the same file_priv can remove the blob; at this point, it is
* not associated with any file_priv. */
mutex_lock(&dev->mode_config.blob_lock);
out_resp->blob_id = blob->base.id;
list_add_tail(&blob->head_file, &file_priv->blobs);
mutex_unlock(&dev->mode_config.blob_lock);
return 0;
out_blob:
drm_property_unreference_blob(blob);
return ret;
}
int drm_mode_destroyblob_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_destroy_blob *out_resp = data;
struct drm_property_blob *blob = NULL, *bt;
bool found = false;
int ret = 0;
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EINVAL;
blob = drm_property_lookup_blob(dev, out_resp->blob_id);
if (!blob)
return -ENOENT;
mutex_lock(&dev->mode_config.blob_lock);
/* Ensure the property was actually created by this user. */
list_for_each_entry(bt, &file_priv->blobs, head_file) {
if (bt == blob) {
found = true;
break;
}
}
if (!found) {
ret = -EPERM;
goto err;
}
/* We must drop head_file here, because we may not be the last
* reference on the blob. */
list_del_init(&blob->head_file);
mutex_unlock(&dev->mode_config.blob_lock);
/* One reference from lookup, and one from the filp. */
drm_property_unreference_blob(blob);
drm_property_unreference_blob(blob);
return 0;
err:
mutex_unlock(&dev->mode_config.blob_lock);
drm_property_unreference_blob(blob);
return ret;
}
/* Some properties could refer to dynamic refcnt'd objects, or things that
* need special locking to handle lifetime issues (ie. to ensure the prop
* value doesn't become invalid part way through the property update due to
* race). The value returned by reference via 'obj' should be passed back
* to drm_property_change_valid_put() after the property is set (and the
* object to which the property is attached has a chance to take it's own
* reference).
*/
bool drm_property_change_valid_get(struct drm_property *property,
uint64_t value, struct drm_mode_object **ref)
{
int i;
if (property->flags & DRM_MODE_PROP_IMMUTABLE)
return false;
*ref = NULL;
if (drm_property_type_is(property, DRM_MODE_PROP_RANGE)) {
if (value < property->values[0] || value > property->values[1])
return false;
return true;
} else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) {
int64_t svalue = U642I64(value);
if (svalue < U642I64(property->values[0]) ||
svalue > U642I64(property->values[1]))
return false;
return true;
} else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
uint64_t valid_mask = 0;
for (i = 0; i < property->num_values; i++)
valid_mask |= (1ULL << property->values[i]);
return !(value & ~valid_mask);
} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) {
struct drm_property_blob *blob;
if (value == 0)
return true;
blob = drm_property_lookup_blob(property->dev, value);
if (blob) {
*ref = &blob->base;
return true;
} else {
return false;
}
} else if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
/* a zero value for an object property translates to null: */
if (value == 0)
return true;
*ref = __drm_mode_object_find(property->dev, value,
property->values[0]);
return *ref != NULL;
}
for (i = 0; i < property->num_values; i++)
if (property->values[i] == value)
return true;
return false;
}
void drm_property_change_valid_put(struct drm_property *property,
struct drm_mode_object *ref)
{
if (!ref)
return;
if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
drm_mode_object_unreference(ref);
} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB))
drm_property_unreference_blob(obj_to_blob(ref));
}
