include/drm/drm_auth.h

root/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
Linux
