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>
38 * struct drm_master - drm master structure
40 * @refcount: Refcount for this master object.
41 * @dev: Link back to the DRM device
42 * @driver_priv: Pointer to driver-private information.
44 * Note that master structures are only relevant for the legacy/primary device
45 * nodes, hence there can only be one per device, not one per drm_minor.
49 struct drm_device *dev;
51 * @unique: Unique identifier: e.g. busid. Protected by
52 * &drm_device.master_mutex.
56 * @unique_len: Length of unique field. Protected by
57 * &drm_device.master_mutex.
61 * @magic_map: Map of used authentication tokens. Protected by
62 * &drm_device.master_mutex.
70 * Lease grantor, only set if this &struct drm_master represents a
71 * lessee holding a lease of objects from @lessor. Full owners of the
72 * device have this set to NULL.
74 * The lessor does not change once it's set in drm_lease_create(), and
75 * each lessee holds a reference to its lessor that it releases upon
76 * being destroyed in drm_lease_destroy().
78 * See also the :ref:`section on display resource leasing
81 struct drm_master *lessor;
86 * ID for lessees. Owners (i.e. @lessor is NULL) always have ID 0.
87 * Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
94 * List entry of lessees of @lessor, where they are linked to @lessees.
95 * Not used for owners. Protected by &drm_device.mode_config's
96 * &drm_mode_config.idr_mutex.
98 struct list_head lessee_list;
103 * List of drm_masters leasing from this one. Protected by
104 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
106 * This list is empty if no leases have been granted, or if all lessees
107 * have been destroyed. Since lessors are referenced by all their
108 * lessees, this master cannot be destroyed unless the list is empty.
110 struct list_head lessees;
115 * Objects leased to this drm_master. Protected by
116 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
118 * Objects are leased all together in drm_lease_create(), and are
119 * removed all together when the lease is revoked.
126 * All lessees under this owner (only used where @lessor is NULL).
127 * Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
129 struct idr lessee_idr;
132 struct drm_master *drm_master_get(struct drm_master *master);
133 struct drm_master *drm_file_get_master(struct drm_file *file_priv);
134 void drm_master_put(struct drm_master **master);
135 bool drm_is_current_master(struct drm_file *fpriv);
137 struct drm_master *drm_master_create(struct drm_device *dev);