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drm_auth.h revision 1.1 
      1 /*	$NetBSD: drm_auth.h,v 1.1 2021/12/18 20:15:56 riastradh Exp $	*/
      2 
      3 #ifndef _DRM_AUTH_H_
      4 #define _DRM_AUTH_H_
      5 
      6 /*
      7  * Internal Header for the Direct Rendering Manager
      8  *
      9  * Copyright 2016 Intel Corporation
     10  *
     11  * Author: Daniel Vetter <daniel.vetter (at) ffwll.ch>
     12  *
     13  * Permission is hereby granted, free of charge, to any person obtaining a
     14  * copy of this software and associated documentation files (the "Software"),
     15  * to deal in the Software without restriction, including without limitation
     16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     17  * and/or sell copies of the Software, and to permit persons to whom the
     18  * Software is furnished to do so, subject to the following conditions:
     19  *
     20  * The above copyright notice and this permission notice (including the next
     21  * paragraph) shall be included in all copies or substantial portions of the
     22  * Software.
     23  *
     24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     27  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     28  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     29  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     30  * OTHER DEALINGS IN THE SOFTWARE.
     31  */
     32 
     33 #include <linux/idr.h>
     34 #include <linux/kref.h>
     35 #include <linux/wait.h>
     36 
     37 struct drm_file;
     38 struct drm_hw_lock;
     39 
     40 /*
     41  * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
     42  * include ordering reasons.
     43  *
     44  * DO NOT USE.
     45  */
     46 struct drm_lock_data {
     47 	struct drm_hw_lock *hw_lock;
     48 	struct drm_file *file_priv;
     49 	wait_queue_head_t lock_queue;
     50 	unsigned long lock_time;
     51 	spinlock_t spinlock;
     52 	uint32_t kernel_waiters;
     53 	uint32_t user_waiters;
     54 	int idle_has_lock;
     55 };
     56 
     57 /**
     58  * struct drm_master - drm master structure
     59  *
     60  * @refcount: Refcount for this master object.
     61  * @dev: Link back to the DRM device
     62  * @driver_priv: Pointer to driver-private information.
     63  * @lessor: Lease holder
     64  * @lessee_id: id for lessees. Owners always have id 0
     65  * @lessee_list: other lessees of the same master
     66  * @lessees: drm_masters leasing from this one
     67  * @leases: Objects leased to this drm_master.
     68  * @lessee_idr: All lessees under this owner (only used where lessor == NULL)
     69  *
     70  * Note that master structures are only relevant for the legacy/primary device
     71  * nodes, hence there can only be one per device, not one per drm_minor.
     72  */
     73 struct drm_master {
     74 	struct kref refcount;
     75 	struct drm_device *dev;
     76 	/**
     77 	 * @unique: Unique identifier: e.g. busid. Protected by
     78 	 * &drm_device.master_mutex.
     79 	 */
     80 	char *unique;
     81 	/**
     82 	 * @unique_len: Length of unique field. Protected by
     83 	 * &drm_device.master_mutex.
     84 	 */
     85 	int unique_len;
     86 	/**
     87 	 * @magic_map: Map of used authentication tokens. Protected by
     88 	 * &drm_device.master_mutex.
     89 	 */
     90 	struct idr magic_map;
     91 	void *driver_priv;
     92 
     93 	/* Tree of display resource leases, each of which is a drm_master struct
     94 	 * All of these get activated simultaneously, so drm_device master points
     95 	 * at the top of the tree (for which lessor is NULL). Protected by
     96 	 * &drm_device.mode_config.idr_mutex.
     97 	 */
     98 
     99 	struct drm_master *lessor;
    100 	int	lessee_id;
    101 	struct list_head lessee_list;
    102 	struct list_head lessees;
    103 	struct idr leases;
    104 	struct idr lessee_idr;
    105 	/* private: */
    106 #if IS_ENABLED(CONFIG_DRM_LEGACY)
    107 	struct drm_lock_data lock;
    108 #endif
    109 };
    110 
    111 struct drm_master *drm_master_get(struct drm_master *master);
    112 void drm_master_put(struct drm_master **master);
    113 bool drm_is_current_master(struct drm_file *fpriv);
    114 
    115 struct drm_master *drm_master_create(struct drm_device *dev);
    116 
    117 #endif
    118