5 * GEM Graphics Execution Manager Driver Interfaces
7 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
8 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
9 * Copyright (c) 2009-2010, Code Aurora Forum.
10 * All rights reserved.
11 * Copyright © 2014 Intel Corporation
12 * Daniel Vetter <daniel.vetter@ffwll.ch>
14 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
15 * Author: Gareth Hughes <gareth@valinux.com>
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18 * copy of this software and associated documentation files (the "Software"),
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22 * Software is furnished to do so, subject to the following conditions:
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38 * This structure defines the drm_mm memory object, which will be used by the
39 * DRM for its buffer objects.
41 struct drm_gem_object {
42 /** Reference count of this object */
46 * handle_count - gem file_priv handle count of this object
48 * Each handle also holds a reference. Note that when the handle_count
49 * drops to 0 any global names (e.g. the id in the flink namespace) will
52 * Protected by dev->object_name_lock.
54 unsigned handle_count;
56 /** Related drm device */
57 struct drm_device *dev;
59 /** File representing the shmem storage */
62 /* Mapping info for this object */
63 struct drm_vma_offset_node vma_node;
66 * Size of the object, in bytes. Immutable over the object's
72 * Global name for this object, starts at 1. 0 means unnamed.
73 * Access is covered by the object_name_lock in the related drm_device
78 * Memory domains. These monitor which caches contain read/write data
79 * related to the object. When transitioning from one set of domains
80 * to another, the driver is called to ensure that caches are suitably
81 * flushed and invalidated
83 uint32_t read_domains;
84 uint32_t write_domain;
87 * While validating an exec operation, the
88 * new read/write domain values are computed here.
89 * They will be transferred to the above values
90 * at the point that any cache flushing occurs
92 uint32_t pending_read_domains;
93 uint32_t pending_write_domain;
96 * dma_buf - dma buf associated with this GEM object
98 * Pointer to the dma-buf associated with this gem object (either
99 * through importing or exporting). We break the resulting reference
100 * loop when the last gem handle for this object is released.
102 * Protected by obj->object_name_lock
104 struct dma_buf *dma_buf;
107 * import_attach - dma buf attachment backing this object
109 * Any foreign dma_buf imported as a gem object has this set to the
110 * attachment point for the device. This is invariant over the lifetime
113 * The driver's ->gem_free_object callback is responsible for cleaning
114 * up the dma_buf attachment and references acquired at import time.
116 * Note that the drm gem/prime core does not depend upon drivers setting
117 * this field any more. So for drivers where this doesn't make sense
118 * (e.g. virtual devices or a displaylink behind an usb bus) they can
119 * simply leave it as NULL.
121 struct dma_buf_attachment *import_attach;
124 void drm_gem_object_release(struct drm_gem_object *obj);
125 void drm_gem_object_free(struct kref *kref);
126 int drm_gem_object_init(struct drm_device *dev,
127 struct drm_gem_object *obj, size_t size);
128 void drm_gem_private_object_init(struct drm_device *dev,
129 struct drm_gem_object *obj, size_t size);
130 void drm_gem_vm_open(struct vm_area_struct *vma);
131 void drm_gem_vm_close(struct vm_area_struct *vma);
132 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
133 struct vm_area_struct *vma);
134 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
137 drm_gem_object_reference(struct drm_gem_object *obj)
139 kref_get(&obj->refcount);
143 drm_gem_object_unreference(struct drm_gem_object *obj)
146 kref_put(&obj->refcount, drm_gem_object_free);
150 drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
152 if (obj && !atomic_add_unless(&obj->refcount.refcount, -1, 1)) {
153 struct drm_device *dev = obj->dev;
155 mutex_lock(&dev->struct_mutex);
156 if (likely(atomic_dec_and_test(&obj->refcount.refcount)))
157 drm_gem_object_free(&obj->refcount);
158 mutex_unlock(&dev->struct_mutex);
162 int drm_gem_handle_create(struct drm_file *file_priv,
163 struct drm_gem_object *obj,
165 int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
168 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
169 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
170 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
172 struct page **drm_gem_get_pages(struct drm_gem_object *obj);
173 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
174 bool dirty, bool accessed);
176 struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
177 struct drm_file *filp,
179 int drm_gem_dumb_destroy(struct drm_file *file,
180 struct drm_device *dev,
183 #endif /* __DRM_GEM_H__ */