5 * Internal Header for the Direct Rendering Manager
7 * Copyright 2016 Intel Corporation
9 * Author: Daniel Vetter <daniel.vetter@ffwll.ch>
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31 #include <linux/idr.h>
32 #include <linux/kref.h>
33 #include <linux/wait.h>
39 * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
40 * include ordering reasons.
44 struct 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;
50 uint32_t kernel_waiters;
51 uint32_t user_waiters;
56 * struct drm_master - drm master structure
58 * @refcount: Refcount for this master object.
59 * @dev: Link back to the DRM device
60 * @driver_priv: Pointer to driver-private information.
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.
67 struct drm_device *dev;
69 * @unique: Unique identifier: e.g. busid. Protected by
70 * &drm_device.master_mutex.
74 * @unique_len: Length of unique field. Protected by
75 * &drm_device.master_mutex.
79 * @magic_map: Map of used authentication tokens. Protected by
80 * &drm_device.master_mutex.
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.
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().
96 * See also the :ref:`section on display resource leasing
99 struct drm_master *lessor;
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.
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.
116 struct list_head lessee_list;
121 * List of drm_masters leasing from this one. Protected by
122 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
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.
128 struct list_head lessees;
133 * Objects leased to this drm_master. Protected by
134 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
136 * Objects are leased all together in drm_lease_create(), and are
137 * removed all together when the lease is revoked.
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.
147 struct idr lessee_idr;
149 #if IS_ENABLED(CONFIG_DRM_LEGACY)
150 struct drm_lock_data lock;
154 struct drm_master *drm_master_get(struct drm_master *master);
155 struct drm_master *drm_file_get_master(struct drm_file *file_priv);
156 void drm_master_put(struct drm_master **master);
157 bool drm_is_current_master(struct drm_file *fpriv);
159 struct drm_master *drm_master_create(struct drm_device *dev);