~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc1 ] ~ [ linux-5.14.5 ] ~ [ linux-5.13.18 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.66 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.147 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.206 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.246 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.282 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.283 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #include <linux/dma-resv.h>
 39 
 40 #include <drm/drm_vma_manager.h>
 41 
 42 struct drm_gem_object;
 43 
 44 /**
 45  * struct drm_gem_object_funcs - GEM object functions
 46  */
 47 struct drm_gem_object_funcs {
 48         /**
 49          * @free:
 50          *
 51          * Deconstructor for drm_gem_objects.
 52          *
 53          * This callback is mandatory.
 54          */
 55         void (*free)(struct drm_gem_object *obj);
 56 
 57         /**
 58          * @open:
 59          *
 60          * Called upon GEM handle creation.
 61          *
 62          * This callback is optional.
 63          */
 64         int (*open)(struct drm_gem_object *obj, struct drm_file *file);
 65 
 66         /**
 67          * @close:
 68          *
 69          * Called upon GEM handle release.
 70          *
 71          * This callback is optional.
 72          */
 73         void (*close)(struct drm_gem_object *obj, struct drm_file *file);
 74 
 75         /**
 76          * @print_info:
 77          *
 78          * If driver subclasses struct &drm_gem_object, it can implement this
 79          * optional hook for printing additional driver specific info.
 80          *
 81          * drm_printf_indent() should be used in the callback passing it the
 82          * indent argument.
 83          *
 84          * This callback is called from drm_gem_print_info().
 85          *
 86          * This callback is optional.
 87          */
 88         void (*print_info)(struct drm_printer *p, unsigned int indent,
 89                            const struct drm_gem_object *obj);
 90 
 91         /**
 92          * @export:
 93          *
 94          * Export backing buffer as a &dma_buf.
 95          * If this is not set drm_gem_prime_export() is used.
 96          *
 97          * This callback is optional.
 98          */
 99         struct dma_buf *(*export)(struct drm_gem_object *obj, int flags);
100 
101         /**
102          * @pin:
103          *
104          * Pin backing buffer in memory. Used by the drm_gem_map_attach() helper.
105          *
106          * This callback is optional.
107          */
108         int (*pin)(struct drm_gem_object *obj);
109 
110         /**
111          * @unpin:
112          *
113          * Unpin backing buffer. Used by the drm_gem_map_detach() helper.
114          *
115          * This callback is optional.
116          */
117         void (*unpin)(struct drm_gem_object *obj);
118 
119         /**
120          * @get_sg_table:
121          *
122          * Returns a Scatter-Gather table representation of the buffer.
123          * Used when exporting a buffer by the drm_gem_map_dma_buf() helper.
124          * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table()
125          * in drm_gem_unmap_buf(), therefore these helpers and this callback
126          * here cannot be used for sg tables pointing at driver private memory
127          * ranges.
128          *
129          * See also drm_prime_pages_to_sg().
130          */
131         struct sg_table *(*get_sg_table)(struct drm_gem_object *obj);
132 
133         /**
134          * @vmap:
135          *
136          * Returns a virtual address for the buffer. Used by the
137          * drm_gem_dmabuf_vmap() helper.
138          *
139          * This callback is optional.
140          */
141         void *(*vmap)(struct drm_gem_object *obj);
142 
143         /**
144          * @vunmap:
145          *
146          * Releases the the address previously returned by @vmap. Used by the
147          * drm_gem_dmabuf_vunmap() helper.
148          *
149          * This callback is optional.
150          */
151         void (*vunmap)(struct drm_gem_object *obj, void *vaddr);
152 
153         /**
154          * @mmap:
155          *
156          * Handle mmap() of the gem object, setup vma accordingly.
157          *
158          * This callback is optional.
159          *
160          * The callback is used by by both drm_gem_mmap_obj() and
161          * drm_gem_prime_mmap().  When @mmap is present @vm_ops is not
162          * used, the @mmap callback must set vma->vm_ops instead.
163          */
164         int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
165 
166         /**
167          * @vm_ops:
168          *
169          * Virtual memory operations used with mmap.
170          *
171          * This is optional but necessary for mmap support.
172          */
173         const struct vm_operations_struct *vm_ops;
174 };
175 
176 /**
177  * struct drm_gem_object - GEM buffer object
178  *
179  * This structure defines the generic parts for GEM buffer objects, which are
180  * mostly around handling mmap and userspace handles.
181  *
182  * Buffer objects are often abbreviated to BO.
183  */
184 struct drm_gem_object {
185         /**
186          * @refcount:
187          *
188          * Reference count of this object
189          *
190          * Please use drm_gem_object_get() to acquire and drm_gem_object_put()
191          * or drm_gem_object_put_unlocked() to release a reference to a GEM
192          * buffer object.
193          */
194         struct kref refcount;
195 
196         /**
197          * @handle_count:
198          *
199          * This is the GEM file_priv handle count of this object.
200          *
201          * Each handle also holds a reference. Note that when the handle_count
202          * drops to 0 any global names (e.g. the id in the flink namespace) will
203          * be cleared.
204          *
205          * Protected by &drm_device.object_name_lock.
206          */
207         unsigned handle_count;
208 
209         /**
210          * @dev: DRM dev this object belongs to.
211          */
212         struct drm_device *dev;
213 
214         /**
215          * @filp:
216          *
217          * SHMEM file node used as backing storage for swappable buffer objects.
218          * GEM also supports driver private objects with driver-specific backing
219          * storage (contiguous CMA memory, special reserved blocks). In this
220          * case @filp is NULL.
221          */
222         struct file *filp;
223 
224         /**
225          * @vma_node:
226          *
227          * Mapping info for this object to support mmap. Drivers are supposed to
228          * allocate the mmap offset using drm_gem_create_mmap_offset(). The
229          * offset itself can be retrieved using drm_vma_node_offset_addr().
230          *
231          * Memory mapping itself is handled by drm_gem_mmap(), which also checks
232          * that userspace is allowed to access the object.
233          */
234         struct drm_vma_offset_node vma_node;
235 
236         /**
237          * @size:
238          *
239          * Size of the object, in bytes.  Immutable over the object's
240          * lifetime.
241          */
242         size_t size;
243 
244         /**
245          * @name:
246          *
247          * Global name for this object, starts at 1. 0 means unnamed.
248          * Access is covered by &drm_device.object_name_lock. This is used by
249          * the GEM_FLINK and GEM_OPEN ioctls.
250          */
251         int name;
252 
253         /**
254          * @dma_buf:
255          *
256          * dma-buf associated with this GEM object.
257          *
258          * Pointer to the dma-buf associated with this gem object (either
259          * through importing or exporting). We break the resulting reference
260          * loop when the last gem handle for this object is released.
261          *
262          * Protected by &drm_device.object_name_lock.
263          */
264         struct dma_buf *dma_buf;
265 
266         /**
267          * @import_attach:
268          *
269          * dma-buf attachment backing this object.
270          *
271          * Any foreign dma_buf imported as a gem object has this set to the
272          * attachment point for the device. This is invariant over the lifetime
273          * of a gem object.
274          *
275          * The &drm_driver.gem_free_object callback is responsible for cleaning
276          * up the dma_buf attachment and references acquired at import time.
277          *
278          * Note that the drm gem/prime core does not depend upon drivers setting
279          * this field any more. So for drivers where this doesn't make sense
280          * (e.g. virtual devices or a displaylink behind an usb bus) they can
281          * simply leave it as NULL.
282          */
283         struct dma_buf_attachment *import_attach;
284 
285         /**
286          * @resv:
287          *
288          * Pointer to reservation object associated with the this GEM object.
289          *
290          * Normally (@resv == &@_resv) except for imported GEM objects.
291          */
292         struct dma_resv *resv;
293 
294         /**
295          * @_resv:
296          *
297          * A reservation object for this GEM object.
298          *
299          * This is unused for imported GEM objects.
300          */
301         struct dma_resv _resv;
302 
303         /**
304          * @funcs:
305          *
306          * Optional GEM object functions. If this is set, it will be used instead of the
307          * corresponding &drm_driver GEM callbacks.
308          *
309          * New drivers should use this.
310          *
311          */
312         const struct drm_gem_object_funcs *funcs;
313 };
314 
315 /**
316  * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
317  * @name: name for the generated structure
318  *
319  * This macro autogenerates a suitable &struct file_operations for GEM based
320  * drivers, which can be assigned to &drm_driver.fops. Note that this structure
321  * cannot be shared between drivers, because it contains a reference to the
322  * current module using THIS_MODULE.
323  *
324  * Note that the declaration is already marked as static - if you need a
325  * non-static version of this you're probably doing it wrong and will break the
326  * THIS_MODULE reference by accident.
327  */
328 #define DEFINE_DRM_GEM_FOPS(name) \
329         static const struct file_operations name = {\
330                 .owner          = THIS_MODULE,\
331                 .open           = drm_open,\
332                 .release        = drm_release,\
333                 .unlocked_ioctl = drm_ioctl,\
334                 .compat_ioctl   = drm_compat_ioctl,\
335                 .poll           = drm_poll,\
336                 .read           = drm_read,\
337                 .llseek         = noop_llseek,\
338                 .mmap           = drm_gem_mmap,\
339         }
340 
341 void drm_gem_object_release(struct drm_gem_object *obj);
342 void drm_gem_object_free(struct kref *kref);
343 int drm_gem_object_init(struct drm_device *dev,
344                         struct drm_gem_object *obj, size_t size);
345 void drm_gem_private_object_init(struct drm_device *dev,
346                                  struct drm_gem_object *obj, size_t size);
347 void drm_gem_vm_open(struct vm_area_struct *vma);
348 void drm_gem_vm_close(struct vm_area_struct *vma);
349 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
350                      struct vm_area_struct *vma);
351 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
352 
353 /**
354  * drm_gem_object_get - acquire a GEM buffer object reference
355  * @obj: GEM buffer object
356  *
357  * This function acquires an additional reference to @obj. It is illegal to
358  * call this without already holding a reference. No locks required.
359  */
360 static inline void drm_gem_object_get(struct drm_gem_object *obj)
361 {
362         kref_get(&obj->refcount);
363 }
364 
365 /**
366  * __drm_gem_object_put - raw function to release a GEM buffer object reference
367  * @obj: GEM buffer object
368  *
369  * This function is meant to be used by drivers which are not encumbered with
370  * &drm_device.struct_mutex legacy locking and which are using the
371  * gem_free_object_unlocked callback. It avoids all the locking checks and
372  * locking overhead of drm_gem_object_put() and drm_gem_object_put_unlocked().
373  *
374  * Drivers should never call this directly in their code. Instead they should
375  * wrap it up into a ``driver_gem_object_put(struct driver_gem_object *obj)``
376  * wrapper function, and use that. Shared code should never call this, to
377  * avoid breaking drivers by accident which still depend upon
378  * &drm_device.struct_mutex locking.
379  */
380 static inline void
381 __drm_gem_object_put(struct drm_gem_object *obj)
382 {
383         kref_put(&obj->refcount, drm_gem_object_free);
384 }
385 
386 void drm_gem_object_put_unlocked(struct drm_gem_object *obj);
387 void drm_gem_object_put(struct drm_gem_object *obj);
388 
389 int drm_gem_handle_create(struct drm_file *file_priv,
390                           struct drm_gem_object *obj,
391                           u32 *handlep);
392 int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
393 
394 
395 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
396 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
397 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
398 
399 struct page **drm_gem_get_pages(struct drm_gem_object *obj);
400 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
401                 bool dirty, bool accessed);
402 
403 int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
404                            int count, struct drm_gem_object ***objs_out);
405 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
406 long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
407                                     bool wait_all, unsigned long timeout);
408 int drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
409                               struct ww_acquire_ctx *acquire_ctx);
410 void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
411                                  struct ww_acquire_ctx *acquire_ctx);
412 int drm_gem_fence_array_add(struct xarray *fence_array,
413                             struct dma_fence *fence);
414 int drm_gem_fence_array_add_implicit(struct xarray *fence_array,
415                                      struct drm_gem_object *obj,
416                                      bool write);
417 int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
418                             u32 handle, u64 *offset);
419 int drm_gem_dumb_destroy(struct drm_file *file,
420                          struct drm_device *dev,
421                          uint32_t handle);
422 
423 #endif /* __DRM_GEM_H__ */
424 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp