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.
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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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37 /* BSD specific gem helpers. */
38 #define DRM_GEM_MAPPING_MASK (3ULL << 62)
39 #define DRM_GEM_MAPPING_KEY (2ULL << 62) /* Non-canonical address form */
40 #define DRM_GEM_MAX_IDX 0x3fffff
41 #define DRM_GEM_MAPPING_IDX(o) (((o) >> 40) & DRM_GEM_MAX_IDX)
42 #define DRM_GEM_MAPPING_OFF(i) (((uint64_t)(i)) << 40)
43 #define DRM_GEM_MAPPING_MAPOFF(o) \
44 ((o) & ~(DRM_GEM_MAPPING_OFF(DRM_GEM_MAX_IDX) | DRM_GEM_MAPPING_KEY))
47 * struct drm_gem_object - GEM buffer object
49 * This structure defines the generic parts for GEM buffer objects, which are
50 * mostly around handling mmap and userspace handles.
52 * Buffer objects are often abbreviated to BO.
54 struct drm_gem_object {
58 * Reference count of this object
60 * Please use drm_gem_object_reference() to acquire and
61 * drm_gem_object_unreference() or drm_gem_object_unreference_unlocked()
62 * to release a reference to a GEM buffer object.
69 * This is the GEM file_priv handle count of this object.
71 * Each handle also holds a reference. Note that when the handle_count
72 * drops to 0 any global names (e.g. the id in the flink namespace) will
75 * Protected by dev->object_name_lock.
77 unsigned handle_count;
80 * @dev: DRM dev this object belongs to.
82 struct drm_device *dev;
87 * SHMEM file node used as backing storage for swappable buffer objects.
88 * GEM also supports driver private objects with driver-specific backing
89 * storage (contiguous CMA memory, special reserved blocks). In this
93 struct vm_object *filp;
101 * Mapping info for this object to support mmap. Drivers are supposed to
102 * allocate the mmap offset using drm_gem_create_mmap_offset(). The
103 * offset itself can be retrieved using drm_vma_node_offset_addr().
105 * Memory mapping itself is handled by drm_gem_mmap(), which also checks
106 * that userspace is allowed to access the object.
108 struct drm_vma_offset_node vma_node;
111 struct drm_hash_item map_list;
117 * Size of the object, in bytes. Immutable over the object's
125 * Global name for this object, starts at 1. 0 means unnamed.
126 * Access is covered by dev->object_name_lock. This is used by the GEM_FLINK
127 * and GEM_OPEN ioctls.
134 * Read memory domains. These monitor which caches contain read/write data
135 * related to the object. When transitioning from one set of domains
136 * to another, the driver is called to ensure that caches are suitably
137 * flushed and invalidated.
139 uint32_t read_domains;
142 * @write_domain: Corresponding unique write memory domain.
144 uint32_t write_domain;
147 * @pending_read_domains:
149 * While validating an exec operation, the
150 * new read/write domain values are computed here.
151 * They will be transferred to the above values
152 * at the point that any cache flushing occurs
154 uint32_t pending_read_domains;
157 * @pending_write_domain: Write domain similar to @pending_read_domains.
159 uint32_t pending_write_domain;
164 * dma-buf associated with this GEM object.
166 * Pointer to the dma-buf associated with this gem object (either
167 * through importing or exporting). We break the resulting reference
168 * loop when the last gem handle for this object is released.
170 * Protected by obj->object_name_lock.
172 struct dma_buf *dma_buf;
177 * dma-buf attachment backing this object.
179 * Any foreign dma_buf imported as a gem object has this set to the
180 * attachment point for the device. This is invariant over the lifetime
183 * The driver's ->gem_free_object callback is responsible for cleaning
184 * up the dma_buf attachment and references acquired at import time.
186 * Note that the drm gem/prime core does not depend upon drivers setting
187 * this field any more. So for drivers where this doesn't make sense
188 * (e.g. virtual devices or a displaylink behind an usb bus) they can
189 * simply leave it as NULL.
191 struct dma_buf_attachment *import_attach;
194 void drm_gem_object_release(struct drm_gem_object *obj);
195 void drm_gem_object_free(struct kref *kref);
196 int drm_gem_object_init(struct drm_device *dev,
197 struct drm_gem_object *obj, size_t size);
198 void drm_gem_private_object_init(struct drm_device *dev,
199 struct drm_gem_object *obj, size_t size);
200 void drm_gem_vm_open(struct vm_area_struct *vma);
201 void drm_gem_vm_close(struct vm_area_struct *vma);
202 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
203 struct vm_area_struct *vma);
204 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
206 int i915_gem_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
207 vm_ooffset_t foff, struct ucred *cred, u_short *color);
208 void i915_gem_pager_dtor(void * handle);
211 * drm_gem_object_reference - acquire a GEM BO reference
212 * @obj: GEM buffer object
214 * This acquires additional reference to @obj. It is illegal to call this
215 * without already holding a reference. No locks required.
218 drm_gem_object_reference(struct drm_gem_object *obj)
220 kref_get(&obj->refcount);
223 void drm_gem_object_unreference_unlocked(struct drm_gem_object *obj);
224 void drm_gem_object_unreference(struct drm_gem_object *obj);
226 int drm_gem_handle_create(struct drm_file *file_priv,
227 struct drm_gem_object *obj,
229 int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
232 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
233 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
234 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
236 struct page **drm_gem_get_pages(struct drm_gem_object *obj);
237 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
238 bool dirty, bool accessed);
240 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
241 int drm_gem_dumb_destroy(struct drm_file *file,
242 struct drm_device *dev,
245 #endif /* __DRM_GEM_H__ */