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940 lines
27 KiB
940 lines
27 KiB
/* |
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* Copyright (c) 2016 Intel Corporation |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and its |
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* documentation for any purpose is hereby granted without fee, provided that |
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* the above copyright notice appear in all copies and that both that copyright |
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* notice and this permission notice appear in supporting documentation, and |
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* that the name of the copyright holders not be used in advertising or |
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* publicity pertaining to distribution of the software without specific, |
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* written prior permission. The copyright holders make no representations |
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* about the suitability of this software for any purpose. It is provided "as |
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* is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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* OF THIS SOFTWARE. |
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*/ |
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|
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#include <linux/export.h> |
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#include <linux/uaccess.h> |
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|
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#include <drm/drm_crtc.h> |
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#include <drm/drm_drv.h> |
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#include <drm/drm_file.h> |
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#include <drm/drm_framebuffer.h> |
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#include <drm/drm_property.h> |
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|
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#include "drm_crtc_internal.h" |
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|
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/** |
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* DOC: overview |
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* |
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* Properties as represented by &drm_property are used to extend the modeset |
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* interface exposed to userspace. For the atomic modeset IOCTL properties are |
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* even the only way to transport metadata about the desired new modeset |
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* configuration from userspace to the kernel. Properties have a well-defined |
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* value range, which is enforced by the drm core. See the documentation of the |
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* flags member of &struct drm_property for an overview of the different |
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* property types and ranges. |
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* |
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* Properties don't store the current value directly, but need to be |
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* instantiated by attaching them to a &drm_mode_object with |
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* drm_object_attach_property(). |
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* |
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* Property values are only 64bit. To support bigger piles of data (like gamma |
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* tables, color correction matrices or large structures) a property can instead |
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* point at a &drm_property_blob with that additional data. |
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* |
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* Properties are defined by their symbolic name, userspace must keep a |
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* per-object mapping from those names to the property ID used in the atomic |
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* IOCTL and in the get/set property IOCTL. |
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*/ |
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|
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static bool drm_property_flags_valid(u32 flags) |
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{ |
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u32 legacy_type = flags & DRM_MODE_PROP_LEGACY_TYPE; |
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u32 ext_type = flags & DRM_MODE_PROP_EXTENDED_TYPE; |
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|
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/* Reject undefined/deprecated flags */ |
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if (flags & ~(DRM_MODE_PROP_LEGACY_TYPE | |
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DRM_MODE_PROP_EXTENDED_TYPE | |
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DRM_MODE_PROP_IMMUTABLE | |
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DRM_MODE_PROP_ATOMIC)) |
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return false; |
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/* We want either a legacy type or an extended type, but not both */ |
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if (!legacy_type == !ext_type) |
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return false; |
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/* Only one legacy type at a time please */ |
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if (legacy_type && !is_power_of_2(legacy_type)) |
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return false; |
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return true; |
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} |
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/** |
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* drm_property_create - create a new property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* @num_values: number of pre-defined values |
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* |
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* This creates a new generic drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create(struct drm_device *dev, |
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u32 flags, const char *name, |
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int num_values) |
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{ |
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struct drm_property *property = NULL; |
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int ret; |
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if (WARN_ON(!drm_property_flags_valid(flags))) |
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return NULL; |
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if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN)) |
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return NULL; |
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property = kzalloc(sizeof(struct drm_property), GFP_KERNEL); |
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if (!property) |
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return NULL; |
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property->dev = dev; |
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if (num_values) { |
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property->values = kcalloc(num_values, sizeof(uint64_t), |
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GFP_KERNEL); |
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if (!property->values) |
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goto fail; |
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} |
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ret = drm_mode_object_add(dev, &property->base, DRM_MODE_OBJECT_PROPERTY); |
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if (ret) |
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goto fail; |
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property->flags = flags; |
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property->num_values = num_values; |
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INIT_LIST_HEAD(&property->enum_list); |
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strscpy_pad(property->name, name, DRM_PROP_NAME_LEN); |
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list_add_tail(&property->head, &dev->mode_config.property_list); |
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return property; |
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fail: |
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kfree(property->values); |
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kfree(property); |
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return NULL; |
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} |
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EXPORT_SYMBOL(drm_property_create); |
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|
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/** |
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* drm_property_create_enum - create a new enumeration property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* @props: enumeration lists with property values |
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* @num_values: number of pre-defined values |
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* |
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* This creates a new generic drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* Userspace is only allowed to set one of the predefined values for enumeration |
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* properties. |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create_enum(struct drm_device *dev, |
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u32 flags, const char *name, |
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const struct drm_prop_enum_list *props, |
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int num_values) |
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{ |
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struct drm_property *property; |
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int i, ret; |
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flags |= DRM_MODE_PROP_ENUM; |
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property = drm_property_create(dev, flags, name, num_values); |
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if (!property) |
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return NULL; |
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for (i = 0; i < num_values; i++) { |
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ret = drm_property_add_enum(property, |
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props[i].type, |
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props[i].name); |
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if (ret) { |
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drm_property_destroy(dev, property); |
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return NULL; |
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} |
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} |
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return property; |
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} |
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EXPORT_SYMBOL(drm_property_create_enum); |
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/** |
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* drm_property_create_bitmask - create a new bitmask property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* @props: enumeration lists with property bitflags |
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* @num_props: size of the @props array |
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* @supported_bits: bitmask of all supported enumeration values |
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* |
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* This creates a new bitmask drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* Compared to plain enumeration properties userspace is allowed to set any |
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* or'ed together combination of the predefined property bitflag values |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create_bitmask(struct drm_device *dev, |
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u32 flags, const char *name, |
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const struct drm_prop_enum_list *props, |
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int num_props, |
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uint64_t supported_bits) |
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{ |
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struct drm_property *property; |
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int i, ret; |
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int num_values = hweight64(supported_bits); |
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flags |= DRM_MODE_PROP_BITMASK; |
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property = drm_property_create(dev, flags, name, num_values); |
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if (!property) |
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return NULL; |
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for (i = 0; i < num_props; i++) { |
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if (!(supported_bits & (1ULL << props[i].type))) |
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continue; |
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ret = drm_property_add_enum(property, |
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props[i].type, |
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props[i].name); |
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if (ret) { |
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drm_property_destroy(dev, property); |
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return NULL; |
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} |
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} |
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return property; |
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} |
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EXPORT_SYMBOL(drm_property_create_bitmask); |
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static struct drm_property *property_create_range(struct drm_device *dev, |
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u32 flags, const char *name, |
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uint64_t min, uint64_t max) |
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{ |
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struct drm_property *property; |
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property = drm_property_create(dev, flags, name, 2); |
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if (!property) |
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return NULL; |
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property->values[0] = min; |
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property->values[1] = max; |
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return property; |
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} |
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/** |
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* drm_property_create_range - create a new unsigned ranged property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* @min: minimum value of the property |
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* @max: maximum value of the property |
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* |
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* This creates a new generic drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* Userspace is allowed to set any unsigned integer value in the (min, max) |
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* range inclusive. |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create_range(struct drm_device *dev, |
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u32 flags, const char *name, |
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uint64_t min, uint64_t max) |
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{ |
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return property_create_range(dev, DRM_MODE_PROP_RANGE | flags, |
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name, min, max); |
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} |
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EXPORT_SYMBOL(drm_property_create_range); |
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/** |
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* drm_property_create_signed_range - create a new signed ranged property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* @min: minimum value of the property |
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* @max: maximum value of the property |
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* |
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* This creates a new generic drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* Userspace is allowed to set any signed integer value in the (min, max) |
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* range inclusive. |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create_signed_range(struct drm_device *dev, |
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u32 flags, const char *name, |
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int64_t min, int64_t max) |
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{ |
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return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags, |
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name, I642U64(min), I642U64(max)); |
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} |
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EXPORT_SYMBOL(drm_property_create_signed_range); |
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/** |
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* drm_property_create_object - create a new object property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* @type: object type from DRM_MODE_OBJECT_* defines |
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* |
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* This creates a new generic drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* Userspace is only allowed to set this to any property value of the given |
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* @type. Only useful for atomic properties, which is enforced. |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create_object(struct drm_device *dev, |
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u32 flags, const char *name, |
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uint32_t type) |
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{ |
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struct drm_property *property; |
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flags |= DRM_MODE_PROP_OBJECT; |
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if (WARN_ON(!(flags & DRM_MODE_PROP_ATOMIC))) |
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return NULL; |
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property = drm_property_create(dev, flags, name, 1); |
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if (!property) |
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return NULL; |
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property->values[0] = type; |
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return property; |
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} |
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EXPORT_SYMBOL(drm_property_create_object); |
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/** |
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* drm_property_create_bool - create a new boolean property type |
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* @dev: drm device |
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* @flags: flags specifying the property type |
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* @name: name of the property |
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* |
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* This creates a new generic drm property which can then be attached to a drm |
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* object with drm_object_attach_property(). The returned property object must |
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* be freed with drm_property_destroy(), which is done automatically when |
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* calling drm_mode_config_cleanup(). |
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* |
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* This is implemented as a ranged property with only {0, 1} as valid values. |
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* |
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* Returns: |
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* A pointer to the newly created property on success, NULL on failure. |
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*/ |
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struct drm_property *drm_property_create_bool(struct drm_device *dev, |
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u32 flags, const char *name) |
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{ |
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return drm_property_create_range(dev, flags, name, 0, 1); |
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} |
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EXPORT_SYMBOL(drm_property_create_bool); |
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/** |
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* drm_property_add_enum - add a possible value to an enumeration property |
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* @property: enumeration property to change |
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* @value: value of the new enumeration |
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* @name: symbolic name of the new enumeration |
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* |
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* This functions adds enumerations to a property. |
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* |
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* It's use is deprecated, drivers should use one of the more specific helpers |
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* to directly create the property with all enumerations already attached. |
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* |
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* Returns: |
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* Zero on success, error code on failure. |
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*/ |
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int drm_property_add_enum(struct drm_property *property, |
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uint64_t value, const char *name) |
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{ |
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struct drm_property_enum *prop_enum; |
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int index = 0; |
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|
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if (WARN_ON(strlen(name) >= DRM_PROP_NAME_LEN)) |
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return -EINVAL; |
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if (WARN_ON(!drm_property_type_is(property, DRM_MODE_PROP_ENUM) && |
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!drm_property_type_is(property, DRM_MODE_PROP_BITMASK))) |
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return -EINVAL; |
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|
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/* |
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* Bitmask enum properties have the additional constraint of values |
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* from 0 to 63 |
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*/ |
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if (WARN_ON(drm_property_type_is(property, DRM_MODE_PROP_BITMASK) && |
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value > 63)) |
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return -EINVAL; |
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list_for_each_entry(prop_enum, &property->enum_list, head) { |
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if (WARN_ON(prop_enum->value == value)) |
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return -EINVAL; |
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index++; |
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} |
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if (WARN_ON(index >= property->num_values)) |
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return -EINVAL; |
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prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL); |
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if (!prop_enum) |
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return -ENOMEM; |
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strscpy_pad(prop_enum->name, name, DRM_PROP_NAME_LEN); |
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prop_enum->value = value; |
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property->values[index] = value; |
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list_add_tail(&prop_enum->head, &property->enum_list); |
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return 0; |
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} |
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EXPORT_SYMBOL(drm_property_add_enum); |
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/** |
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* drm_property_destroy - destroy a drm property |
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* @dev: drm device |
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* @property: property to destroy |
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* |
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* This function frees a property including any attached resources like |
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* enumeration values. |
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*/ |
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void drm_property_destroy(struct drm_device *dev, struct drm_property *property) |
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{ |
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struct drm_property_enum *prop_enum, *pt; |
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list_for_each_entry_safe(prop_enum, pt, &property->enum_list, head) { |
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list_del(&prop_enum->head); |
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kfree(prop_enum); |
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} |
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|
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if (property->num_values) |
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kfree(property->values); |
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drm_mode_object_unregister(dev, &property->base); |
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list_del(&property->head); |
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kfree(property); |
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} |
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EXPORT_SYMBOL(drm_property_destroy); |
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|
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int drm_mode_getproperty_ioctl(struct drm_device *dev, |
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void *data, struct drm_file *file_priv) |
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{ |
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struct drm_mode_get_property *out_resp = data; |
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struct drm_property *property; |
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int enum_count = 0; |
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int value_count = 0; |
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int i, copied; |
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struct drm_property_enum *prop_enum; |
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struct drm_mode_property_enum __user *enum_ptr; |
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uint64_t __user *values_ptr; |
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|
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if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
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return -EOPNOTSUPP; |
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property = drm_property_find(dev, file_priv, out_resp->prop_id); |
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if (!property) |
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return -ENOENT; |
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|
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strscpy_pad(out_resp->name, property->name, DRM_PROP_NAME_LEN); |
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out_resp->flags = property->flags; |
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|
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value_count = property->num_values; |
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values_ptr = u64_to_user_ptr(out_resp->values_ptr); |
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|
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for (i = 0; i < value_count; i++) { |
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if (i < out_resp->count_values && |
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put_user(property->values[i], values_ptr + i)) { |
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return -EFAULT; |
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} |
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} |
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out_resp->count_values = value_count; |
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|
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copied = 0; |
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enum_ptr = u64_to_user_ptr(out_resp->enum_blob_ptr); |
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|
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if (drm_property_type_is(property, DRM_MODE_PROP_ENUM) || |
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drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) { |
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list_for_each_entry(prop_enum, &property->enum_list, head) { |
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enum_count++; |
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if (out_resp->count_enum_blobs < enum_count) |
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continue; |
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|
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if (copy_to_user(&enum_ptr[copied].value, |
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&prop_enum->value, sizeof(uint64_t))) |
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return -EFAULT; |
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|
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if (copy_to_user(&enum_ptr[copied].name, |
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&prop_enum->name, DRM_PROP_NAME_LEN)) |
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return -EFAULT; |
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copied++; |
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} |
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out_resp->count_enum_blobs = enum_count; |
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} |
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|
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/* |
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* NOTE: The idea seems to have been to use this to read all the blob |
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* property values. But nothing ever added them to the corresponding |
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* list, userspace always used the special-purpose get_blob ioctl to |
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* read the value for a blob property. It also doesn't make a lot of |
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* sense to return values here when everything else is just metadata for |
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* the property itself. |
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*/ |
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if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) |
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out_resp->count_enum_blobs = 0; |
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|
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return 0; |
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} |
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|
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static void drm_property_free_blob(struct kref *kref) |
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{ |
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struct drm_property_blob *blob = |
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container_of(kref, struct drm_property_blob, base.refcount); |
|
|
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mutex_lock(&blob->dev->mode_config.blob_lock); |
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list_del(&blob->head_global); |
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mutex_unlock(&blob->dev->mode_config.blob_lock); |
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|
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drm_mode_object_unregister(blob->dev, &blob->base); |
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|
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kvfree(blob); |
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} |
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|
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/** |
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* drm_property_create_blob - Create new blob property |
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* @dev: DRM device to create property for |
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* @length: Length to allocate for blob data |
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* @data: If specified, copies data into blob |
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* |
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* Creates a new blob property for a specified DRM device, optionally |
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* copying data. Note that blob properties are meant to be invariant, hence the |
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* data must be filled out before the blob is used as the value of any property. |
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* |
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* Returns: |
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* New blob property with a single reference on success, or an ERR_PTR |
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* value on failure. |
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*/ |
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struct drm_property_blob * |
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drm_property_create_blob(struct drm_device *dev, size_t length, |
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const void *data) |
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{ |
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struct drm_property_blob *blob; |
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int ret; |
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|
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if (!length || length > INT_MAX - sizeof(struct drm_property_blob)) |
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return ERR_PTR(-EINVAL); |
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|
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blob = kvzalloc(sizeof(struct drm_property_blob)+length, GFP_KERNEL); |
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if (!blob) |
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return ERR_PTR(-ENOMEM); |
|
|
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/* This must be explicitly initialised, so we can safely call list_del |
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* on it in the removal handler, even if it isn't in a file list. */ |
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INIT_LIST_HEAD(&blob->head_file); |
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blob->data = (void *)blob + sizeof(*blob); |
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blob->length = length; |
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blob->dev = dev; |
|
|
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if (data) |
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memcpy(blob->data, data, length); |
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|
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ret = __drm_mode_object_add(dev, &blob->base, DRM_MODE_OBJECT_BLOB, |
|
true, drm_property_free_blob); |
|
if (ret) { |
|
kvfree(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_blob_put - release a blob property reference |
|
* @blob: DRM blob property |
|
* |
|
* Releases a reference to a blob property. May free the object. |
|
*/ |
|
void drm_property_blob_put(struct drm_property_blob *blob) |
|
{ |
|
if (!blob) |
|
return; |
|
|
|
drm_mode_object_put(&blob->base); |
|
} |
|
EXPORT_SYMBOL(drm_property_blob_put); |
|
|
|
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_blob_put(blob); |
|
} |
|
} |
|
|
|
/** |
|
* drm_property_blob_get - acquire blob property reference |
|
* @blob: DRM blob property |
|
* |
|
* Acquires a reference to an existing blob property. Returns @blob, which |
|
* allows this to be used as a shorthand in assignments. |
|
*/ |
|
struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob) |
|
{ |
|
drm_mode_object_get(&blob->base); |
|
return blob; |
|
} |
|
EXPORT_SYMBOL(drm_property_blob_get); |
|
|
|
/** |
|
* 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 unreferenced the returned property |
|
* again, using drm_property_blob_put(). |
|
* |
|
* 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, NULL, 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_blob_put(old_blob); |
|
*replace = new_blob; |
|
|
|
return 0; |
|
|
|
err_created: |
|
drm_property_blob_put(new_blob); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(drm_property_replace_global_blob); |
|
|
|
/** |
|
* drm_property_replace_blob - replace a blob property |
|
* @blob: a pointer to the member blob to be replaced |
|
* @new_blob: the new blob to replace with |
|
* |
|
* Return: true if the blob was in fact replaced. |
|
*/ |
|
bool drm_property_replace_blob(struct drm_property_blob **blob, |
|
struct drm_property_blob *new_blob) |
|
{ |
|
struct drm_property_blob *old_blob = *blob; |
|
|
|
if (old_blob == new_blob) |
|
return false; |
|
|
|
drm_property_blob_put(old_blob); |
|
if (new_blob) |
|
drm_property_blob_get(new_blob); |
|
*blob = new_blob; |
|
return true; |
|
} |
|
EXPORT_SYMBOL(drm_property_replace_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; |
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
|
return -EOPNOTSUPP; |
|
|
|
blob = drm_property_lookup_blob(dev, out_resp->blob_id); |
|
if (!blob) |
|
return -ENOENT; |
|
|
|
if (out_resp->length == blob->length) { |
|
if (copy_to_user(u64_to_user_ptr(out_resp->data), |
|
blob->data, |
|
blob->length)) { |
|
ret = -EFAULT; |
|
goto unref; |
|
} |
|
} |
|
out_resp->length = blob->length; |
|
unref: |
|
drm_property_blob_put(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; |
|
int ret = 0; |
|
|
|
if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
|
return -EOPNOTSUPP; |
|
|
|
blob = drm_property_create_blob(dev, out_resp->length, NULL); |
|
if (IS_ERR(blob)) |
|
return PTR_ERR(blob); |
|
|
|
if (copy_from_user(blob->data, |
|
u64_to_user_ptr(out_resp->data), |
|
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_blob_put(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 -EOPNOTSUPP; |
|
|
|
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_blob_put(blob); |
|
drm_property_blob_put(blob); |
|
|
|
return 0; |
|
|
|
err: |
|
mutex_unlock(&dev->mode_config.blob_lock); |
|
drm_property_blob_put(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 its 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, NULL, 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_put(ref); |
|
} else if (drm_property_type_is(property, DRM_MODE_PROP_BLOB)) |
|
drm_property_blob_put(obj_to_blob(ref)); |
|
}
|
|
|