cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

drm_auth.h (4754B)

      1#ifndef _DRM_AUTH_H_
      2#define _DRM_AUTH_H_
      3
      4/*
      5 * Internal Header for the Direct Rendering Manager
      6 *
      7 * Copyright 2016 Intel Corporation
      8 *
      9 * Author: Daniel Vetter <daniel.vetter@ffwll.ch>
     10 *
     11 * Permission is hereby granted, free of charge, to any person obtaining a
     12 * copy of this software and associated documentation files (the "Software"),
     13 * to deal in the Software without restriction, including without limitation
     14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     15 * and/or sell copies of the Software, and to permit persons to whom the
     16 * Software is furnished to do so, subject to the following conditions:
     17 *
     18 * The above copyright notice and this permission notice (including the next
     19 * paragraph) shall be included in all copies or substantial portions of the
     20 * Software.
     21 *
     22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     28 * OTHER DEALINGS IN THE SOFTWARE.
     29 */
     30
     31#include <linux/idr.h>
     32#include <linux/kref.h>
     33#include <linux/wait.h>
     34
     35struct drm_file;
     36struct drm_hw_lock;
     37
     38/*
     39 * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
     40 * include ordering reasons.
     41 *
     42 * DO NOT USE.
     43 */
     44struct drm_lock_data {
     45	struct drm_hw_lock *hw_lock;
     46	struct drm_file *file_priv;
     47	wait_queue_head_t lock_queue;
     48	unsigned long lock_time;
     49	spinlock_t spinlock;
     50	uint32_t kernel_waiters;
     51	uint32_t user_waiters;
     52	int idle_has_lock;
     53};
     54
     55/**
     56 * struct drm_master - drm master structure
     57 *
     58 * @refcount: Refcount for this master object.
     59 * @dev: Link back to the DRM device
     60 * @driver_priv: Pointer to driver-private information.
     61 *
     62 * Note that master structures are only relevant for the legacy/primary device
     63 * nodes, hence there can only be one per device, not one per drm_minor.
     64 */
     65struct drm_master {
     66	struct kref refcount;
     67	struct drm_device *dev;
     68	/**
     69	 * @unique: Unique identifier: e.g. busid. Protected by
     70	 * &drm_device.master_mutex.
     71	 */
     72	char *unique;
     73	/**
     74	 * @unique_len: Length of unique field. Protected by
     75	 * &drm_device.master_mutex.
     76	 */
     77	int unique_len;
     78	/**
     79	 * @magic_map: Map of used authentication tokens. Protected by
     80	 * &drm_device.master_mutex.
     81	 */
     82	struct idr magic_map;
     83	void *driver_priv;
     84
     85	/**
     86	 * @lessor:
     87	 *
     88	 * Lease grantor, only set if this &struct drm_master represents a
     89	 * lessee holding a lease of objects from @lessor. Full owners of the
     90	 * device have this set to NULL.
     91	 *
     92	 * The lessor does not change once it's set in drm_lease_create(), and
     93	 * each lessee holds a reference to its lessor that it releases upon
     94	 * being destroyed in drm_lease_destroy().
     95	 *
     96	 * See also the :ref:`section on display resource leasing
     97	 * <drm_leasing>`.
     98	 */
     99	struct drm_master *lessor;
    100
    101	/**
    102	 * @lessee_id:
    103	 *
    104	 * ID for lessees. Owners (i.e. @lessor is NULL) always have ID 0.
    105	 * Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
    106	 */
    107	int	lessee_id;
    108
    109	/**
    110	 * @lessee_list:
    111	 *
    112	 * List entry of lessees of @lessor, where they are linked to @lessees.
    113	 * Not used for owners. Protected by &drm_device.mode_config's
    114	 * &drm_mode_config.idr_mutex.
    115	 */
    116	struct list_head lessee_list;
    117
    118	/**
    119	 * @lessees:
    120	 *
    121	 * List of drm_masters leasing from this one. Protected by
    122	 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
    123	 *
    124	 * This list is empty if no leases have been granted, or if all lessees
    125	 * have been destroyed. Since lessors are referenced by all their
    126	 * lessees, this master cannot be destroyed unless the list is empty.
    127	 */
    128	struct list_head lessees;
    129
    130	/**
    131	 * @leases:
    132	 *
    133	 * Objects leased to this drm_master. Protected by
    134	 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
    135	 *
    136	 * Objects are leased all together in drm_lease_create(), and are
    137	 * removed all together when the lease is revoked.
    138	 */
    139	struct idr leases;
    140
    141	/**
    142	 * @lessee_idr:
    143	 *
    144	 * All lessees under this owner (only used where @lessor is NULL).
    145	 * Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
    146	 */
    147	struct idr lessee_idr;
    148	/* private: */
    149#if IS_ENABLED(CONFIG_DRM_LEGACY)
    150	struct drm_lock_data lock;
    151#endif
    152};
    153
    154struct drm_master *drm_master_get(struct drm_master *master);
    155struct drm_master *drm_file_get_master(struct drm_file *file_priv);
    156void drm_master_put(struct drm_master **master);
    157bool drm_is_current_master(struct drm_file *fpriv);
    158
    159struct drm_master *drm_master_create(struct drm_device *dev);
    160
    161#endif