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TOMOYO Linux Cross Reference
Linux/include/drm/drm_gem.h

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  1 #ifndef __DRM_GEM_H__
  2 #define __DRM_GEM_H__
  3 
  4 /*
  5  * GEM Graphics Execution Manager Driver Interfaces
  6  *
  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>
 13  *
 14  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
 15  * Author: Gareth Hughes <gareth@valinux.com>
 16  *
 17  * Permission is hereby granted, free of charge, to any person obtaining a
 18  * copy of this software and associated documentation files (the "Software"),
 19  * to deal in the Software without restriction, including without limitation
 20  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 21  * and/or sell copies of the Software, and to permit persons to whom the
 22  * Software is furnished to do so, subject to the following conditions:
 23  *
 24  * The above copyright notice and this permission notice (including the next
 25  * paragraph) shall be included in all copies or substantial portions of the
 26  * Software.
 27  *
 28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 29  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 30  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 31  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 32  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 33  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 34  * OTHER DEALINGS IN THE SOFTWARE.
 35  */
 36 
 37 #include <linux/kref.h>
 38 
 39 #include <drm/drm_vma_manager.h>
 40 
 41 /**
 42  * struct drm_gem_object - GEM buffer object
 43  *
 44  * This structure defines the generic parts for GEM buffer objects, which are
 45  * mostly around handling mmap and userspace handles.
 46  *
 47  * Buffer objects are often abbreviated to BO.
 48  */
 49 struct drm_gem_object {
 50         /**
 51          * @refcount:
 52          *
 53          * Reference count of this object
 54          *
 55          * Please use drm_gem_object_get() to acquire and drm_gem_object_put()
 56          * or drm_gem_object_put_unlocked() to release a reference to a GEM
 57          * buffer object.
 58          */
 59         struct kref refcount;
 60 
 61         /**
 62          * @handle_count:
 63          *
 64          * This is the GEM file_priv handle count of this object.
 65          *
 66          * Each handle also holds a reference. Note that when the handle_count
 67          * drops to 0 any global names (e.g. the id in the flink namespace) will
 68          * be cleared.
 69          *
 70          * Protected by &drm_device.object_name_lock.
 71          */
 72         unsigned handle_count;
 73 
 74         /**
 75          * @dev: DRM dev this object belongs to.
 76          */
 77         struct drm_device *dev;
 78 
 79         /**
 80          * @filp:
 81          *
 82          * SHMEM file node used as backing storage for swappable buffer objects.
 83          * GEM also supports driver private objects with driver-specific backing
 84          * storage (contiguous CMA memory, special reserved blocks). In this
 85          * case @filp is NULL.
 86          */
 87         struct file *filp;
 88 
 89         /**
 90          * @vma_node:
 91          *
 92          * Mapping info for this object to support mmap. Drivers are supposed to
 93          * allocate the mmap offset using drm_gem_create_mmap_offset(). The
 94          * offset itself can be retrieved using drm_vma_node_offset_addr().
 95          *
 96          * Memory mapping itself is handled by drm_gem_mmap(), which also checks
 97          * that userspace is allowed to access the object.
 98          */
 99         struct drm_vma_offset_node vma_node;
100 
101         /**
102          * @size:
103          *
104          * Size of the object, in bytes.  Immutable over the object's
105          * lifetime.
106          */
107         size_t size;
108 
109         /**
110          * @name:
111          *
112          * Global name for this object, starts at 1. 0 means unnamed.
113          * Access is covered by &drm_device.object_name_lock. This is used by
114          * the GEM_FLINK and GEM_OPEN ioctls.
115          */
116         int name;
117 
118         /**
119          * @read_domains:
120          *
121          * Read memory domains. These monitor which caches contain read/write data
122          * related to the object. When transitioning from one set of domains
123          * to another, the driver is called to ensure that caches are suitably
124          * flushed and invalidated.
125          */
126         uint32_t read_domains;
127 
128         /**
129          * @write_domain: Corresponding unique write memory domain.
130          */
131         uint32_t write_domain;
132 
133         /**
134          * @pending_read_domains:
135          *
136          * While validating an exec operation, the
137          * new read/write domain values are computed here.
138          * They will be transferred to the above values
139          * at the point that any cache flushing occurs
140          */
141         uint32_t pending_read_domains;
142 
143         /**
144          * @pending_write_domain: Write domain similar to @pending_read_domains.
145          */
146         uint32_t pending_write_domain;
147 
148         /**
149          * @dma_buf:
150          *
151          * dma-buf associated with this GEM object.
152          *
153          * Pointer to the dma-buf associated with this gem object (either
154          * through importing or exporting). We break the resulting reference
155          * loop when the last gem handle for this object is released.
156          *
157          * Protected by &drm_device.object_name_lock.
158          */
159         struct dma_buf *dma_buf;
160 
161         /**
162          * @import_attach:
163          *
164          * dma-buf attachment backing this object.
165          *
166          * Any foreign dma_buf imported as a gem object has this set to the
167          * attachment point for the device. This is invariant over the lifetime
168          * of a gem object.
169          *
170          * The &drm_driver.gem_free_object callback is responsible for cleaning
171          * up the dma_buf attachment and references acquired at import time.
172          *
173          * Note that the drm gem/prime core does not depend upon drivers setting
174          * this field any more. So for drivers where this doesn't make sense
175          * (e.g. virtual devices or a displaylink behind an usb bus) they can
176          * simply leave it as NULL.
177          */
178         struct dma_buf_attachment *import_attach;
179 };
180 
181 /**
182  * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
183  * @name: name for the generated structure
184  *
185  * This macro autogenerates a suitable &struct file_operations for GEM based
186  * drivers, which can be assigned to &drm_driver.fops. Note that this structure
187  * cannot be shared between drivers, because it contains a reference to the
188  * current module using THIS_MODULE.
189  *
190  * Note that the declaration is already marked as static - if you need a
191  * non-static version of this you're probably doing it wrong and will break the
192  * THIS_MODULE reference by accident.
193  */
194 #define DEFINE_DRM_GEM_FOPS(name) \
195         static const struct file_operations name = {\
196                 .owner          = THIS_MODULE,\
197                 .open           = drm_open,\
198                 .release        = drm_release,\
199                 .unlocked_ioctl = drm_ioctl,\
200                 .compat_ioctl   = drm_compat_ioctl,\
201                 .poll           = drm_poll,\
202                 .read           = drm_read,\
203                 .llseek         = noop_llseek,\
204                 .mmap           = drm_gem_mmap,\
205         }
206 
207 void drm_gem_object_release(struct drm_gem_object *obj);
208 void drm_gem_object_free(struct kref *kref);
209 int drm_gem_object_init(struct drm_device *dev,
210                         struct drm_gem_object *obj, size_t size);
211 void drm_gem_private_object_init(struct drm_device *dev,
212                                  struct drm_gem_object *obj, size_t size);
213 void drm_gem_vm_open(struct vm_area_struct *vma);
214 void drm_gem_vm_close(struct vm_area_struct *vma);
215 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
216                      struct vm_area_struct *vma);
217 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
218 
219 /**
220  * drm_gem_object_get - acquire a GEM buffer object reference
221  * @obj: GEM buffer object
222  *
223  * This function acquires an additional reference to @obj. It is illegal to
224  * call this without already holding a reference. No locks required.
225  */
226 static inline void drm_gem_object_get(struct drm_gem_object *obj)
227 {
228         kref_get(&obj->refcount);
229 }
230 
231 /**
232  * __drm_gem_object_put - raw function to release a GEM buffer object reference
233  * @obj: GEM buffer object
234  *
235  * This function is meant to be used by drivers which are not encumbered with
236  * &drm_device.struct_mutex legacy locking and which are using the
237  * gem_free_object_unlocked callback. It avoids all the locking checks and
238  * locking overhead of drm_gem_object_put() and drm_gem_object_put_unlocked().
239  *
240  * Drivers should never call this directly in their code. Instead they should
241  * wrap it up into a ``driver_gem_object_put(struct driver_gem_object *obj)``
242  * wrapper function, and use that. Shared code should never call this, to
243  * avoid breaking drivers by accident which still depend upon
244  * &drm_device.struct_mutex locking.
245  */
246 static inline void
247 __drm_gem_object_put(struct drm_gem_object *obj)
248 {
249         kref_put(&obj->refcount, drm_gem_object_free);
250 }
251 
252 void drm_gem_object_put_unlocked(struct drm_gem_object *obj);
253 void drm_gem_object_put(struct drm_gem_object *obj);
254 
255 /**
256  * drm_gem_object_reference - acquire a GEM buffer object reference
257  * @obj: GEM buffer object
258  *
259  * This is a compatibility alias for drm_gem_object_get() and should not be
260  * used by new code.
261  */
262 static inline void drm_gem_object_reference(struct drm_gem_object *obj)
263 {
264         drm_gem_object_get(obj);
265 }
266 
267 /**
268  * __drm_gem_object_unreference - raw function to release a GEM buffer object
269  *                                reference
270  * @obj: GEM buffer object
271  *
272  * This is a compatibility alias for __drm_gem_object_put() and should not be
273  * used by new code.
274  */
275 static inline void __drm_gem_object_unreference(struct drm_gem_object *obj)
276 {
277         __drm_gem_object_put(obj);
278 }
279 
280 /**
281  * drm_gem_object_unreference_unlocked - release a GEM buffer object reference
282  * @obj: GEM buffer object
283  *
284  * This is a compatibility alias for drm_gem_object_put_unlocked() and should
285  * not be used by new code.
286  */
287 static inline void
288 drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
289 {
290         drm_gem_object_put_unlocked(obj);
291 }
292 
293 /**
294  * drm_gem_object_unreference - release a GEM buffer object reference
295  * @obj: GEM buffer object
296  *
297  * This is a compatibility alias for drm_gem_object_put() and should not be
298  * used by new code.
299  */
300 static inline void drm_gem_object_unreference(struct drm_gem_object *obj)
301 {
302         drm_gem_object_put(obj);
303 }
304 
305 int drm_gem_handle_create(struct drm_file *file_priv,
306                           struct drm_gem_object *obj,
307                           u32 *handlep);
308 int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
309 
310 
311 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
312 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
313 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
314 
315 struct page **drm_gem_get_pages(struct drm_gem_object *obj);
316 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
317                 bool dirty, bool accessed);
318 
319 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
320 int drm_gem_dumb_destroy(struct drm_file *file,
321                          struct drm_device *dev,
322                          uint32_t handle);
323 
324 #endif /* __DRM_GEM_H__ */
325 

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