/* $NetBSD: drm_property.h,v 1.2 2021/12/18 23:45:46 riastradh Exp $ */
/*
* 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.
*/
#ifndef __DRM_PROPERTY_H__
#define __DRM_PROPERTY_H__
#include <linux/list.h>
#include <linux/ctype.h>
#include <drm/drm_mode_object.h>
#include <uapi/drm/drm_mode.h>
/**
* struct drm_property_enum - symbolic values for enumerations
* @value: numeric property value for this enum entry
* @head: list of enum values, linked to &drm_property.enum_list
* @name: symbolic name for the enum
*
* For enumeration and bitmask properties this structure stores the symbolic
* decoding for each value. This is used for example for the rotation property.
*/
struct drm_property_enum {
uint64_t value;
struct list_head head;
char name[DRM_PROP_NAME_LEN];
};
/**
* struct drm_property - modeset object property
*
* This structure represent a modeset object property. It combines both the name
* of the property with the set of permissible values. This means that when a
* driver wants to use a property with the same name on different objects, but
* with different value ranges, then it must create property for each one. An
* example would be rotation of &drm_plane, when e.g. the primary plane cannot
* be rotated. But if both the name and the value range match, then the same
* property structure can be instantiated multiple times for the same object.
* Userspace must be able to cope with this and cannot assume that the same
* symbolic property will have the same modeset object ID on all modeset
* objects.
*
* Properties are created by one of the special functions, as explained in
* detail in the @flags structure member.
*
* To actually expose a property it must be attached to each object using
* drm_object_attach_property(). Currently properties can only be attached to
* &drm_connector, &drm_crtc and &drm_plane.
*
* Properties are also used as the generic metadatatransport for the atomic
* IOCTL. Everything that was set directly in structures in the legacy modeset
* IOCTLs (like the plane source or destination windows, or e.g. the links to
* the CRTC) is exposed as a property with the DRM_MODE_PROP_ATOMIC flag set.
*/
struct drm_property {
/**
* @head: per-device list of properties, for cleanup.
*/
struct list_head head;
/**
* @base: base KMS object
*/
struct drm_mode_object base;
/**
* @flags:
*
* Property flags and type. A property needs to be one of the following
* types:
*
* DRM_MODE_PROP_RANGE
* Range properties report their minimum and maximum admissible unsigned values.
* The KMS core verifies that values set by application fit in that
* range. The range is unsigned. Range properties are created using
* drm_property_create_range().
*
* DRM_MODE_PROP_SIGNED_RANGE
* Range properties report their minimum and maximum admissible unsigned values.
* The KMS core verifies that values set by application fit in that
* range. The range is signed. Range properties are created using
* drm_property_create_signed_range().
*
* DRM_MODE_PROP_ENUM
* Enumerated properties take a numerical value that ranges from 0 to
* the number of enumerated values defined by the property minus one,
* and associate a free-formed string name to each value. Applications
* can retrieve the list of defined value-name pairs and use the
* numerical value to get and set property instance values. Enum
* properties are created using drm_property_create_enum().
*
* DRM_MODE_PROP_BITMASK
* Bitmask properties are enumeration properties that additionally
* restrict all enumerated values to the 0..63 range. Bitmask property
* instance values combine one or more of the enumerated bits defined
* by the property. Bitmask properties are created using
* drm_property_create_bitmask().
*
* DRM_MODE_PROB_OBJECT
* Object properties are used to link modeset objects. This is used
* extensively in the atomic support to create the display pipeline,
* by linking &drm_framebuffer to &drm_plane, &drm_plane to
* &drm_crtc and &drm_connector to &drm_crtc. An object property can
* only link to a specific type of &drm_mode_object, this limit is
* enforced by the core. Object properties are created using
* drm_property_create_object().
*
* Object properties work like blob properties, but in a more
* general fashion. They are limited to atomic drivers and must have
* the DRM_MODE_PROP_ATOMIC flag set.
*
* DRM_MODE_PROP_BLOB
* Blob properties store a binary blob without any format restriction.
* The binary blobs are created as KMS standalone objects, and blob
* property instance values store the ID of their associated blob
* object. Blob properties are created by calling
* drm_property_create() with DRM_MODE_PROP_BLOB as the type.
*
* Actual blob objects to contain blob data are created using
* drm_property_create_blob(), or through the corresponding IOCTL.
*
* Besides the built-in limit to only accept blob objects blob
* properties work exactly like object properties. The only reasons
* blob properties exist is backwards compatibility with existing
* userspace.
*
* In addition a property can have any combination of the below flags:
*
* DRM_MODE_PROP_ATOMIC
* Set for properties which encode atomic modeset state. Such
* properties are not exposed to legacy userspace.
*
* DRM_MODE_PROP_IMMUTABLE
* Set for properties whose values cannot be changed by
* userspace. The kernel is allowed to update the value of these
* properties. This is generally used to expose probe state to
* userspace, e.g. the EDID, or the connector path property on DP
* MST sinks. Kernel can update the value of an immutable property
* by calling drm_object_property_set_value().
*/
uint32_t flags;
/**
* @name: symbolic name of the properties
*/
char name[DRM_PROP_NAME_LEN];
/**
* @num_values: size of the @values array.
*/
uint32_t num_values;
/**
* @values:
*
* Array with limits and values for the property. The
* interpretation of these limits is dependent upon the type per @flags.
*/
uint64_t *values;
/**
* @dev: DRM device
*/
struct drm_device *dev;
/**
* @enum_list:
*
* List of &drm_prop_enum_list structures with the symbolic names for
* enum and bitmask values.
*/
struct list_head enum_list;
};
/**
* struct drm_property_blob - Blob data for &drm_property
* @base: base KMS object
* @dev: DRM device
* @head_global: entry on the global blob list in
* &drm_mode_config.property_blob_list.
* @head_file: entry on the per-file blob list in &drm_file.blobs list.
* @length: size of the blob in bytes, invariant over the lifetime of the object
* @data: actual data, embedded at the end of this structure
*
* Blobs are used to store bigger values than what fits directly into the 64
* bits available for a &drm_property.
*
* Blobs are reference counted using drm_property_blob_get() and
* drm_property_blob_put(). They are created using drm_property_create_blob().
*/
struct drm_property_blob {
struct drm_mode_object base;
struct drm_device *dev;
struct list_head head_global;
struct list_head head_file;
size_t length;
void *data;
};
struct drm_prop_enum_list {
int type;
const char *name;
};
#define obj_to_property(x) container_of(x, struct drm_property, base)
#define obj_to_blob(x) container_of(x, struct drm_property_blob, base)
/**
* drm_property_type_is - check the type of a property
* @property: property to check
* @type: property type to compare with
*
* This is a helper function becauase the uapi encoding of property types is
* a bit special for historical reasons.
*/
static inline bool drm_property_type_is(struct drm_property *property,
uint32_t type)
{
/* instanceof for props.. handles extended type vs original types: */
if (property->flags & DRM_MODE_PROP_EXTENDED_TYPE)
return (property->flags & DRM_MODE_PROP_EXTENDED_TYPE) == type;
return property->flags & type;
}
struct drm_property *drm_property_create(struct drm_device *dev,
u32 flags, const char *name,
int num_values);
struct drm_property *drm_property_create_enum(struct drm_device *dev,
u32 flags, const char *name,
const struct drm_prop_enum_list *props,
int num_values);
struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
u32 flags, const char *name,
const struct drm_prop_enum_list *props,
int num_props,
uint64_t supported_bits);
struct drm_property *drm_property_create_range(struct drm_device *dev,
u32 flags, const char *name,
uint64_t min, uint64_t max);
struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
u32 flags, const char *name,
int64_t min, int64_t max);
struct drm_property *drm_property_create_object(struct drm_device *dev,
u32 flags, const char *name,
uint32_t type);
struct drm_property *drm_property_create_bool(struct drm_device *dev,
u32 flags, const char *name);
int drm_property_add_enum(struct drm_property *property,
uint64_t value, const char *name);
void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
struct drm_property_blob *drm_property_create_blob(struct drm_device *dev,
size_t length,
const void *data);
struct drm_property_blob *drm_property_lookup_blob(struct drm_device *dev,
uint32_t id);
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);
bool drm_property_replace_blob(struct drm_property_blob **blob,
struct drm_property_blob *new_blob);
struct drm_property_blob *drm_property_blob_get(struct drm_property_blob *blob);
void drm_property_blob_put(struct drm_property_blob *blob);
/**
* drm_property_find - find property object
* @dev: DRM device
* @file_priv: drm file to check for lease against.
* @id: property object id
*
* This function looks up the property object specified by id and returns it.
*/
static inline struct drm_property *drm_property_find(struct drm_device *dev,
struct drm_file *file_priv,
uint32_t id)
{
struct drm_mode_object *mo;
mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_PROPERTY);
return mo ? obj_to_property(mo) : NULL;
}
#endif