Current File : //usr/lib/modules/6.8.0-45-generic/build/include/drm/drm_auth.h
#ifndef _DRM_AUTH_H_
#define _DRM_AUTH_H_
/*
* Internal Header for the Direct Rendering Manager
*
* Copyright 2016 Intel Corporation
*
* Author: Daniel Vetter <daniel.vetter@ffwll.ch>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/idr.h>
#include <linux/kref.h>
#include <linux/wait.h>
struct drm_file;
/**
* struct drm_master - drm master structure
*
* @refcount: Refcount for this master object.
* @dev: Link back to the DRM device
* @driver_priv: Pointer to driver-private information.
*
* Note that master structures are only relevant for the legacy/primary device
* nodes, hence there can only be one per device, not one per drm_minor.
*/
struct drm_master {
struct kref refcount;
struct drm_device *dev;
/**
* @unique: Unique identifier: e.g. busid. Protected by
* &drm_device.master_mutex.
*/
char *unique;
/**
* @unique_len: Length of unique field. Protected by
* &drm_device.master_mutex.
*/
int unique_len;
/**
* @magic_map: Map of used authentication tokens. Protected by
* &drm_device.master_mutex.
*/
struct idr magic_map;
void *driver_priv;
/**
* @lessor:
*
* Lease grantor, only set if this &struct drm_master represents a
* lessee holding a lease of objects from @lessor. Full owners of the
* device have this set to NULL.
*
* The lessor does not change once it's set in drm_lease_create(), and
* each lessee holds a reference to its lessor that it releases upon
* being destroyed in drm_lease_destroy().
*
* See also the :ref:`section on display resource leasing
* <drm_leasing>`.
*/
struct drm_master *lessor;
/**
* @lessee_id:
*
* ID for lessees. Owners (i.e. @lessor is NULL) always have ID 0.
* Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
*/
int lessee_id;
/**
* @lessee_list:
*
* List entry of lessees of @lessor, where they are linked to @lessees.
* Not used for owners. Protected by &drm_device.mode_config's
* &drm_mode_config.idr_mutex.
*/
struct list_head lessee_list;
/**
* @lessees:
*
* List of drm_masters leasing from this one. Protected by
* &drm_device.mode_config's &drm_mode_config.idr_mutex.
*
* This list is empty if no leases have been granted, or if all lessees
* have been destroyed. Since lessors are referenced by all their
* lessees, this master cannot be destroyed unless the list is empty.
*/
struct list_head lessees;
/**
* @leases:
*
* Objects leased to this drm_master. Protected by
* &drm_device.mode_config's &drm_mode_config.idr_mutex.
*
* Objects are leased all together in drm_lease_create(), and are
* removed all together when the lease is revoked.
*/
struct idr leases;
/**
* @lessee_idr:
*
* All lessees under this owner (only used where @lessor is NULL).
* Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
*/
struct idr lessee_idr;
};
struct drm_master *drm_master_get(struct drm_master *master);
struct drm_master *drm_file_get_master(struct drm_file *file_priv);
void drm_master_put(struct drm_master **master);
bool drm_is_current_master(struct drm_file *fpriv);
struct drm_master *drm_master_create(struct drm_device *dev);
#endif
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