301 lines
11 KiB
C
301 lines
11 KiB
C
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/*
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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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#ifndef __DRM_PROPERTY_H__
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#define __DRM_PROPERTY_H__
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <drm/drm_mode_object.h>
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/**
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* struct drm_property_enum - symbolic values for enumerations
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* @value: numeric property value for this enum entry
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* @head: list of enum values, linked to &drm_property.enum_list
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* @name: symbolic name for the enum
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*
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* For enumeration and bitmask properties this structure stores the symbolic
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* decoding for each value. This is used for example for the rotation property.
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*/
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struct drm_property_enum {
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uint64_t value;
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struct list_head head;
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char name[DRM_PROP_NAME_LEN];
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};
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/**
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* struct drm_property - modeset object property
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*
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* This structure represent a modeset object property. It combines both the name
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* of the property with the set of permissible values. This means that when a
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* driver wants to use a property with the same name on different objects, but
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* with different value ranges, then it must create property for each one. An
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* example would be rotation of &drm_plane, when e.g. the primary plane cannot
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* be rotated. But if both the name and the value range match, then the same
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* property structure can be instantiated multiple times for the same object.
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* Userspace must be able to cope with this and cannot assume that the same
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* symbolic property will have the same modeset object ID on all modeset
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* objects.
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*
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* Properties are created by one of the special functions, as explained in
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* detail in the @flags structure member.
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*
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* To actually expose a property it must be attached to each object using
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* drm_object_attach_property(). Currently properties can only be attached to
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* &drm_connector, &drm_crtc and &drm_plane.
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*
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* Properties are also used as the generic metadatatransport for the atomic
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* IOCTL. Everything that was set directly in structures in the legacy modeset
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* IOCTLs (like the plane source or destination windows, or e.g. the links to
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* the CRTC) is exposed as a property with the DRM_MODE_PROP_ATOMIC flag set.
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*/
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struct drm_property {
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/**
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* @head: per-device list of properties, for cleanup.
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*/
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struct list_head head;
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/**
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* @base: base KMS object
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*/
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struct drm_mode_object base;
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/**
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* @flags:
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*
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* Property flags and type. A property needs to be one of the following
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* types:
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*
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* DRM_MODE_PROP_RANGE
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* Range properties report their minimum and maximum admissible unsigned values.
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* The KMS core verifies that values set by application fit in that
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* range. The range is unsigned. Range properties are created using
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* drm_property_create_range().
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*
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* DRM_MODE_PROP_SIGNED_RANGE
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* Range properties report their minimum and maximum admissible unsigned values.
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* The KMS core verifies that values set by application fit in that
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* range. The range is signed. Range properties are created using
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* drm_property_create_signed_range().
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*
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* DRM_MODE_PROP_ENUM
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* Enumerated properties take a numerical value that ranges from 0 to
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* the number of enumerated values defined by the property minus one,
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* and associate a free-formed string name to each value. Applications
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* can retrieve the list of defined value-name pairs and use the
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* numerical value to get and set property instance values. Enum
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* properties are created using drm_property_create_enum().
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*
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* DRM_MODE_PROP_BITMASK
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* Bitmask properties are enumeration properties that additionally
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* restrict all enumerated values to the 0..63 range. Bitmask property
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* instance values combine one or more of the enumerated bits defined
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* by the property. Bitmask properties are created using
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* drm_property_create_bitmask().
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*
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* DRM_MODE_PROB_OBJECT
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* Object properties are used to link modeset objects. This is used
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* extensively in the atomic support to create the display pipeline,
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* by linking &drm_framebuffer to &drm_plane, &drm_plane to
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* &drm_crtc and &drm_connector to &drm_crtc. An object property can
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* only link to a specific type of &drm_mode_object, this limit is
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* enforced by the core. Object properties are created using
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* drm_property_create_object().
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*
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* Object properties work like blob properties, but in a more
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* general fashion. They are limited to atomic drivers and must have
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* the DRM_MODE_PROP_ATOMIC flag set.
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*
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* DRM_MODE_PROP_BLOB
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* Blob properties store a binary blob without any format restriction.
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* The binary blobs are created as KMS standalone objects, and blob
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* property instance values store the ID of their associated blob
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* object. Blob properties are created by calling
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* drm_property_create() with DRM_MODE_PROP_BLOB as the type.
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*
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* Actual blob objects to contain blob data are created using
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* drm_property_create_blob(), or through the corresponding IOCTL.
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*
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* Besides the built-in limit to only accept blob objects blob
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* properties work exactly like object properties. The only reasons
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* blob properties exist is backwards compatibility with existing
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* userspace.
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*
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* In addition a property can have any combination of the below flags:
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*
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* DRM_MODE_PROP_ATOMIC
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* Set for properties which encode atomic modeset state. Such
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* properties are not exposed to legacy userspace.
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*
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* DRM_MODE_PROP_IMMUTABLE
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* Set for properties whose values cannot be changed by
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* userspace. The kernel is allowed to update the value of these
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* properties. This is generally used to expose probe state to
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* userspace, e.g. the EDID, or the connector path property on DP
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* MST sinks.
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*/
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uint32_t flags;
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/**
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* @name: symbolic name of the properties
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*/
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char name[DRM_PROP_NAME_LEN];
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/**
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* @num_values: size of the @values array.
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*/
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uint32_t num_values;
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/**
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* @values:
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*
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* Array with limits and values for the property. The
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* interpretation of these limits is dependent upon the type per @flags.
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*/
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uint64_t *values;
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/**
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* @dev: DRM device
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*/
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struct drm_device *dev;
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/**
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* @enum_list:
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*
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* List of &drm_prop_enum_list structures with the symbolic names for
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* enum and bitmask values.
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*/
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struct list_head enum_list;
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};
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/**
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* struct drm_property_blob - Blob data for &drm_property
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* @base: base KMS object
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* @dev: DRM device
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* @head_global: entry on the global blob list in
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* &drm_mode_config.property_blob_list.
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* @head_file: entry on the per-file blob list in &drm_file.blobs list.
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* @length: size of the blob in bytes, invariant over the lifetime of the object
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* @data: actual data, embedded at the end of this structure
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*
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* Blobs are used to store bigger values than what fits directly into the 64
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* bits available for a &drm_property.
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*
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* Blobs are reference counted using drm_property_blob_get() and
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* drm_property_blob_put(). They are created using drm_property_create_blob().
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*/
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struct drm_property_blob {
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struct drm_mode_object base;
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struct drm_device *dev;
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struct list_head head_global;
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struct list_head head_file;
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size_t length;
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void *data;
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};
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struct drm_prop_enum_list {
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int type;
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const char *name;
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};
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#define obj_to_property(x) container_of(x, struct drm_property, base)
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#define obj_to_blob(x) container_of(x, struct drm_property_blob, base)
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/**
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* drm_property_type_is - check the type of a property
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* @property: property to check
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* @type: property type to compare with
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*
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* This is a helper function becauase the uapi encoding of property types is
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* a bit special for historical reasons.
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*/
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static inline bool drm_property_type_is(struct drm_property *property,
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uint32_t type)
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{
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/* instanceof for props.. handles extended type vs original types: */
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if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
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return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
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return property->flags & type;
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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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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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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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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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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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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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struct drm_property *drm_property_create_bool(struct drm_device *dev,
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u32 flags, const char *name);
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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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void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
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struct drm_property_blob *drm_property_create_blob(struct drm_device *dev,
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size_t length,
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const void *data);
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struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
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uint32_t id);
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int drm_property_replace_global_blob(struct drm_device *dev,
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struct drm_property_blob **replace,
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size_t length,
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const void *data,
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struct drm_mode_object *obj_holds_id,
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struct drm_property *prop_holds_id);
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bool drm_property_replace_blob(struct drm_property_blob **blob,
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struct drm_property_blob *new_blob);
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struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob);
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void drm_property_blob_put(struct drm_property_blob *blob);
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/**
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* drm_property_find - find property object
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* @dev: DRM device
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* @file_priv: drm file to check for lease against.
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* @id: property object id
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*
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* This function looks up the property object specified by id and returns it.
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*/
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static inline struct drm_property *drm_property_find(struct drm_device *dev,
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struct drm_file *file_priv,
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uint32_t id)
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{
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struct drm_mode_object *mo;
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mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_PROPERTY);
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return mo ? obj_to_property(mo) : NULL;
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}
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#endif
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