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-buf.h>
39 #include <linux/dma-resv.h>
40 #include <linux/list.h>
41 #include <linux/mutex.h>
42
43 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
44 #include <drm/drm_device.h>
45 #endif
46 #include <drm/drm_vma_manager.h>
47
48 struct iosys_map;
49 struct drm_gem_object;
50
51 /**
52 * enum drm_gem_object_status - bitmask of object state for fdinfo reporting
53 * @DRM_GEM_OBJECT_RESIDENT: object is resident in memory (ie. not unpinned)
54 * @DRM_GEM_OBJECT_PURGEABLE: object marked as purgeable by userspace
55 * @DRM_GEM_OBJECT_ACTIVE: object is currently used by an active submission
56 *
57 * Bitmask of status used for fdinfo memory stats, see &drm_gem_object_funcs.status
58 * and drm_show_fdinfo(). Note that an object can report DRM_GEM_OBJECT_PURGEABLE
59 * and be active or not resident, in which case drm_show_fdinfo() will not
60 * account for it as purgeable. So drivers do not need to check if the buffer
61 * is idle and resident to return this bit, i.e. userspace can mark a buffer as
62 * purgeable even while it is still busy on the GPU. It will not get reported in
63 * the puregeable stats until it becomes idle. The status gem object func does
64 * not need to consider this.
65 */
66 enum drm_gem_object_status {
67 DRM_GEM_OBJECT_RESIDENT = BIT(0),
68 DRM_GEM_OBJECT_PURGEABLE = BIT(1),
69 DRM_GEM_OBJECT_ACTIVE = BIT(2),
70 };
71
72 /**
73 * struct drm_gem_object_funcs - GEM object functions
74 */
75 struct drm_gem_object_funcs {
76 /**
77 * @free:
78 *
79 * Deconstructor for drm_gem_objects.
80 *
81 * This callback is mandatory.
82 */
83 void (*free)(struct drm_gem_object *obj);
84
85 /**
86 * @open:
87 *
88 * Called upon GEM handle creation.
89 *
90 * This callback is optional.
91 */
92 int (*open)(struct drm_gem_object *obj, struct drm_file *file);
93
94 /**
95 * @close:
96 *
97 * Called upon GEM handle release.
98 *
99 * This callback is optional.
100 */
101 void (*close)(struct drm_gem_object *obj, struct drm_file *file);
102
103 /**
104 * @print_info:
105 *
106 * If driver subclasses struct &drm_gem_object, it can implement this
107 * optional hook for printing additional driver specific info.
108 *
109 * drm_printf_indent() should be used in the callback passing it the
110 * indent argument.
111 *
112 * This callback is called from drm_gem_print_info().
113 *
114 * This callback is optional.
115 */
116 void (*print_info)(struct drm_printer *p, unsigned int indent,
117 const struct drm_gem_object *obj);
118
119 /**
120 * @export:
121 *
122 * Export backing buffer as a &dma_buf.
123 * If this is not set drm_gem_prime_export() is used.
124 *
125 * This callback is optional.
126 */
127 struct dma_buf *(*export)(struct drm_gem_object *obj, int flags);
128
129 /**
130 * @pin:
131 *
132 * Pin backing buffer in memory, such that dma-buf importers can
133 * access it. Used by the drm_gem_map_attach() helper.
134 *
135 * This callback is optional.
136 */
137 int (*pin)(struct drm_gem_object *obj);
138
139 /**
140 * @unpin:
141 *
142 * Unpin backing buffer. Used by the drm_gem_map_detach() helper.
143 *
144 * This callback is optional.
145 */
146 void (*unpin)(struct drm_gem_object *obj);
147
148 /**
149 * @get_sg_table:
150 *
151 * Returns a Scatter-Gather table representation of the buffer.
152 * Used when exporting a buffer by the drm_gem_map_dma_buf() helper.
153 * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table()
154 * in drm_gem_unmap_buf(), therefore these helpers and this callback
155 * here cannot be used for sg tables pointing at driver private memory
156 * ranges.
157 *
158 * See also drm_prime_pages_to_sg().
159 */
160 struct sg_table *(*get_sg_table)(struct drm_gem_object *obj);
161
162 /**
163 * @vmap:
164 *
165 * Returns a virtual address for the buffer. Used by the
166 * drm_gem_dmabuf_vmap() helper. Called with a held GEM reservation
167 * lock.
168 *
169 * This callback is optional.
170 */
171 int (*vmap)(struct drm_gem_object *obj, struct iosys_map *map);
172
173 /**
174 * @vunmap:
175 *
176 * Releases the address previously returned by @vmap. Used by the
177 * drm_gem_dmabuf_vunmap() helper. Called with a held GEM reservation
178 * lock.
179 *
180 * This callback is optional.
181 */
182 void (*vunmap)(struct drm_gem_object *obj, struct iosys_map *map);
183
184 /**
185 * @mmap:
186 *
187 * Handle mmap() of the gem object, setup vma accordingly.
188 *
189 * This callback is optional.
190 *
191 * The callback is used by both drm_gem_mmap_obj() and
192 * drm_gem_prime_mmap(). When @mmap is present @vm_ops is not
193 * used, the @mmap callback must set vma->vm_ops instead.
194 */
195 int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma);
196
197 /**
198 * @evict:
199 *
200 * Evicts gem object out from memory. Used by the drm_gem_object_evict()
201 * helper. Returns 0 on success, -errno otherwise. Called with a held
202 * GEM reservation lock.
203 *
204 * This callback is optional.
205 */
206 int (*evict)(struct drm_gem_object *obj);
207
208 /**
209 * @status:
210 *
211 * The optional status callback can return additional object state
212 * which determines which stats the object is counted against. The
213 * callback is called under table_lock. Racing against object status
214 * change is "harmless", and the callback can expect to not race
215 * against object destruction.
216 *
217 * Called by drm_show_memory_stats().
218 */
219 enum drm_gem_object_status (*status)(struct drm_gem_object *obj);
220
221 /**
222 * @rss:
223 *
224 * Return resident size of the object in physical memory.
225 *
226 * Called by drm_show_memory_stats().
227 */
228 size_t (*rss)(struct drm_gem_object *obj);
229
230 /**
231 * @vm_ops:
232 *
233 * Virtual memory operations used with mmap.
234 *
235 * This is optional but necessary for mmap support.
236 */
237 const struct vm_operations_struct *vm_ops;
238 };
239
240 /**
241 * struct drm_gem_lru - A simple LRU helper
242 *
243 * A helper for tracking GEM objects in a given state, to aid in
244 * driver's shrinker implementation. Tracks the count of pages
245 * for lockless &shrinker.count_objects, and provides
246 * &drm_gem_lru_scan for driver's &shrinker.scan_objects
247 * implementation.
248 *
249 * Any access to this kind of object must be done with
250 * drm_device::gem_lru_mutex held.
251 */
252 struct drm_gem_lru {
253 /**
254 * @count:
255 *
256 * The total number of backing pages of the GEM objects in
257 * this LRU.
258 */
259 long count;
260
261 /**
262 * @list:
263 *
264 * The LRU list.
265 */
266 struct list_head list;
267 };
268
269 /**
270 * struct drm_gem_object - GEM buffer object
271 *
272 * This structure defines the generic parts for GEM buffer objects, which are
273 * mostly around handling mmap and userspace handles.
274 *
275 * Buffer objects are often abbreviated to BO.
276 */
277 struct drm_gem_object {
278 /**
279 * @refcount:
280 *
281 * Reference count of this object
282 *
283 * Please use drm_gem_object_get() to acquire and drm_gem_object_put_locked()
284 * or drm_gem_object_put() to release a reference to a GEM
285 * buffer object.
286 */
287 struct kref refcount;
288
289 /**
290 * @handle_count:
291 *
292 * This is the GEM file_priv handle count of this object.
293 *
294 * Each handle also holds a reference. Note that when the handle_count
295 * drops to 0 any global names (e.g. the id in the flink namespace) will
296 * be cleared.
297 *
298 * Protected by &drm_device.object_name_lock.
299 */
300 unsigned handle_count;
301
302 /**
303 * @dev: DRM dev this object belongs to.
304 */
305 struct drm_device *dev;
306
307 /**
308 * @filp:
309 *
310 * SHMEM file node used as backing storage for swappable buffer objects.
311 * GEM also supports driver private objects with driver-specific backing
312 * storage (contiguous DMA memory, special reserved blocks). In this
313 * case @filp is NULL.
314 */
315 struct file *filp;
316
317 /**
318 * @vma_node:
319 *
320 * Mapping info for this object to support mmap. Drivers are supposed to
321 * allocate the mmap offset using drm_gem_create_mmap_offset(). The
322 * offset itself can be retrieved using drm_vma_node_offset_addr().
323 *
324 * Memory mapping itself is handled by drm_gem_mmap(), which also checks
325 * that userspace is allowed to access the object.
326 */
327 struct drm_vma_offset_node vma_node;
328
329 /**
330 * @size:
331 *
332 * Size of the object, in bytes. Immutable over the object's
333 * lifetime.
334 */
335 size_t size;
336
337 /**
338 * @name:
339 *
340 * Global name for this object, starts at 1. 0 means unnamed.
341 * Access is covered by &drm_device.object_name_lock. This is used by
342 * the GEM_FLINK and GEM_OPEN ioctls.
343 */
344 int name;
345
346 /**
347 * @dma_buf:
348 *
349 * dma-buf associated with this GEM object.
350 *
351 * Pointer to the dma-buf associated with this gem object (either
352 * through importing or exporting). We break the resulting reference
353 * loop when the last gem handle for this object is released.
354 *
355 * Protected by &drm_device.object_name_lock.
356 */
357 struct dma_buf *dma_buf;
358
359 /**
360 * @import_attach:
361 *
362 * dma-buf attachment backing this object.
363 *
364 * Any foreign dma_buf imported as a gem object has this set to the
365 * attachment point for the device. This is invariant over the lifetime
366 * of a gem object.
367 *
368 * The &drm_gem_object_funcs.free callback is responsible for
369 * cleaning up the dma_buf attachment and references acquired at import
370 * time.
371 *
372 * Note that the drm gem/prime core does not depend upon drivers setting
373 * this field any more. So for drivers where this doesn't make sense
374 * (e.g. virtual devices or a displaylink behind an usb bus) they can
375 * simply leave it as NULL.
376 */
377 struct dma_buf_attachment *import_attach;
378
379 /**
380 * @resv:
381 *
382 * Pointer to reservation object associated with the this GEM object.
383 *
384 * Normally (@resv == &@_resv) except for imported GEM objects.
385 */
386 struct dma_resv *resv;
387
388 /**
389 * @_resv:
390 *
391 * A reservation object for this GEM object.
392 *
393 * This is unused for imported GEM objects.
394 */
395 struct dma_resv _resv;
396
397 /**
398 * @gpuva: Fields used by GPUVM to manage mappings pointing to this GEM object.
399 *
400 * When DRM_GPUVM_IMMEDIATE_MODE is set, this list is protected by the
401 * mutex. Otherwise, the list is protected by the GEMs &dma_resv lock.
402 *
403 * Note that all entries in this list must agree on whether
404 * DRM_GPUVM_IMMEDIATE_MODE is set.
405 */
406 struct {
407 /**
408 * @gpuva.list: list of GPUVM mappings attached to this GEM object.
409 *
410 * Drivers should lock list accesses with either the GEMs
411 * &dma_resv lock (&drm_gem_object.resv) or the
412 * &drm_gem_object.gpuva.lock mutex.
413 */
414 struct list_head list;
415
416 /**
417 * @gpuva.lock: lock protecting access to &drm_gem_object.gpuva.list
418 * when DRM_GPUVM_IMMEDIATE_MODE is used.
419 *
420 * Only used when DRM_GPUVM_IMMEDIATE_MODE is set. It should be
421 * safe to take this mutex during the fence signalling path, so
422 * do not allocate memory while holding this lock. Otherwise,
423 * the &dma_resv lock should be used.
424 */
425 struct mutex lock;
426 } gpuva;
427
428 /**
429 * @funcs:
430 *
431 * Optional GEM object functions. If this is set, it will be used instead of the
432 * corresponding &drm_driver GEM callbacks.
433 *
434 * New drivers should use this.
435 *
436 */
437 const struct drm_gem_object_funcs *funcs;
438
439 /**
440 * @lru_node:
441 *
442 * List node in a &drm_gem_lru.
443 */
444 struct list_head lru_node;
445
446 /**
447 * @lru:
448 *
449 * The current LRU list that the GEM object is on.
450 *
451 * Access to this field must be done with drm_device::gem_lru_mutex
452 * held.
453 */
454 struct drm_gem_lru *lru;
455 };
456
457 /**
458 * DRM_GEM_FOPS - Default drm GEM file operations
459 *
460 * This macro provides a shorthand for setting the GEM file ops in the
461 * &file_operations structure. If all you need are the default ops, use
462 * DEFINE_DRM_GEM_FOPS instead.
463 */
464 #define DRM_GEM_FOPS \
465 .open = drm_open,\
466 .release = drm_release,\
467 .unlocked_ioctl = drm_ioctl,\
468 .compat_ioctl = drm_compat_ioctl,\
469 .poll = drm_poll,\
470 .read = drm_read,\
471 .llseek = noop_llseek,\
472 .get_unmapped_area = drm_gem_get_unmapped_area,\
473 .mmap = drm_gem_mmap, \
474 .fop_flags = FOP_UNSIGNED_OFFSET
475
476 /**
477 * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers
478 * @name: name for the generated structure
479 *
480 * This macro autogenerates a suitable &struct file_operations for GEM based
481 * drivers, which can be assigned to &drm_driver.fops. Note that this structure
482 * cannot be shared between drivers, because it contains a reference to the
483 * current module using THIS_MODULE.
484 *
485 * Note that the declaration is already marked as static - if you need a
486 * non-static version of this you're probably doing it wrong and will break the
487 * THIS_MODULE reference by accident.
488 */
489 #define DEFINE_DRM_GEM_FOPS(name) \
490 static const struct file_operations name = {\
491 .owner = THIS_MODULE,\
492 DRM_GEM_FOPS,\
493 }
494
495 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
496 int drm_gem_huge_mnt_create(struct drm_device *dev, const char *value);
497 #else
drm_gem_huge_mnt_create(struct drm_device * dev,const char * value)498 static inline int drm_gem_huge_mnt_create(struct drm_device *dev,
499 const char *value)
500 {
501 return 0;
502 }
503 #endif
504
505 /**
506 * drm_gem_get_huge_mnt - Get the huge tmpfs mountpoint used by a DRM device
507 * @dev: DRM device
508 *
509 * This function gets the huge tmpfs mountpoint used by DRM device @dev. A huge
510 * tmpfs mountpoint is used instead of `shm_mnt` after a successful call to
511 * drm_gem_huge_mnt_create() when CONFIG_TRANSPARENT_HUGEPAGE is enabled.
512 *
513 * Returns:
514 * The huge tmpfs mountpoint in use, NULL otherwise.
515 */
drm_gem_get_huge_mnt(struct drm_device * dev)516 static inline struct vfsmount *drm_gem_get_huge_mnt(struct drm_device *dev)
517 {
518 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
519 return dev->huge_mnt;
520 #else
521 return NULL;
522 #endif
523 }
524
525 void drm_gem_object_release(struct drm_gem_object *obj);
526 void drm_gem_object_free(struct kref *kref);
527 int drm_gem_object_init(struct drm_device *dev,
528 struct drm_gem_object *obj, size_t size);
529 void drm_gem_private_object_init(struct drm_device *dev,
530 struct drm_gem_object *obj, size_t size);
531 void drm_gem_private_object_fini(struct drm_gem_object *obj);
532 void drm_gem_vm_open(struct vm_area_struct *vma);
533 void drm_gem_vm_close(struct vm_area_struct *vma);
534 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size,
535 struct vm_area_struct *vma);
536 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
537
538 #ifdef CONFIG_MMU
539 unsigned long drm_gem_get_unmapped_area(struct file *filp, unsigned long uaddr,
540 unsigned long len, unsigned long pgoff,
541 unsigned long flags);
542 #else
543 #define drm_gem_get_unmapped_area NULL
544 #endif
545
546 /**
547 * drm_gem_object_get - acquire a GEM buffer object reference
548 * @obj: GEM buffer object
549 *
550 * This function acquires an additional reference to @obj. It is illegal to
551 * call this without already holding a reference. No locks required.
552 */
drm_gem_object_get(struct drm_gem_object * obj)553 static inline void drm_gem_object_get(struct drm_gem_object *obj)
554 {
555 kref_get(&obj->refcount);
556 }
557
558 __attribute__((nonnull))
559 static inline void
__drm_gem_object_put(struct drm_gem_object * obj)560 __drm_gem_object_put(struct drm_gem_object *obj)
561 {
562 kref_put(&obj->refcount, drm_gem_object_free);
563 }
564
565 /**
566 * drm_gem_object_put - drop a GEM buffer object reference
567 * @obj: GEM buffer object
568 *
569 * This releases a reference to @obj.
570 */
571 static inline void
drm_gem_object_put(struct drm_gem_object * obj)572 drm_gem_object_put(struct drm_gem_object *obj)
573 {
574 if (obj)
575 __drm_gem_object_put(obj);
576 }
577
578 int drm_gem_handle_create(struct drm_file *file_priv,
579 struct drm_gem_object *obj,
580 u32 *handlep);
581 int drm_gem_handle_delete(struct drm_file *filp, u32 handle);
582
583
584 void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
585 int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
586 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size);
587
588 struct page **drm_gem_get_pages(struct drm_gem_object *obj);
589 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
590 bool dirty, bool accessed);
591
592 void drm_gem_lock(struct drm_gem_object *obj);
593 void drm_gem_unlock(struct drm_gem_object *obj);
594
595 int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map);
596 void drm_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map);
597
598 int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles,
599 int count, struct drm_gem_object ***objs_out);
600 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle);
601 long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
602 bool wait_all, unsigned long timeout);
603 int drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
604 struct ww_acquire_ctx *acquire_ctx);
605 void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count,
606 struct ww_acquire_ctx *acquire_ctx);
607 int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
608 u32 handle, u64 *offset);
609
610 void drm_gem_lru_init(struct drm_gem_lru *lru);
611 void drm_gem_lru_remove(struct drm_gem_object *obj);
612 void drm_gem_lru_move_tail_locked(struct drm_gem_lru *lru, struct drm_gem_object *obj);
613 void drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object *obj);
614 unsigned long
615 drm_gem_lru_scan(struct drm_device *dev,
616 struct drm_gem_lru *lru,
617 unsigned int nr_to_scan,
618 unsigned long *remaining,
619 bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
620 struct ww_acquire_ctx *ticket);
621
622 int drm_gem_evict_locked(struct drm_gem_object *obj);
623
624 /**
625 * drm_gem_object_is_shared_for_memory_stats - helper for shared memory stats
626 *
627 * This helper should only be used for fdinfo shared memory stats to determine
628 * if a GEM object is shared.
629 *
630 * @obj: obj in question
631 */
drm_gem_object_is_shared_for_memory_stats(struct drm_gem_object * obj)632 static inline bool drm_gem_object_is_shared_for_memory_stats(struct drm_gem_object *obj)
633 {
634 return (obj->handle_count > 1) || obj->dma_buf;
635 }
636
637 /**
638 * drm_gem_is_imported() - Tests if GEM object's buffer has been imported
639 * @obj: the GEM object
640 *
641 * Returns:
642 * True if the GEM object's buffer has been imported, false otherwise
643 */
drm_gem_is_imported(const struct drm_gem_object * obj)644 static inline bool drm_gem_is_imported(const struct drm_gem_object *obj)
645 {
646 return !!obj->import_attach;
647 }
648
649 #ifdef CONFIG_LOCKDEP
650 #define drm_gem_gpuva_assert_lock_held(gpuvm, obj) \
651 lockdep_assert(drm_gpuvm_immediate_mode(gpuvm) ? \
652 lockdep_is_held(&(obj)->gpuva.lock) : \
653 dma_resv_held((obj)->resv))
654 #else
655 #define drm_gem_gpuva_assert_lock_held(gpuvm, obj) do {} while (0)
656 #endif
657
658 /**
659 * drm_gem_gpuva_init() - initialize the gpuva list of a GEM object
660 * @obj: the &drm_gem_object
661 *
662 * This initializes the &drm_gem_object's &drm_gpuvm_bo list.
663 *
664 * Calling this function is only necessary for drivers intending to support the
665 * &drm_driver_feature DRIVER_GEM_GPUVA.
666 *
667 * See also drm_gem_gpuva_set_lock().
668 */
drm_gem_gpuva_init(struct drm_gem_object * obj)669 static inline void drm_gem_gpuva_init(struct drm_gem_object *obj)
670 {
671 INIT_LIST_HEAD(&obj->gpuva.list);
672 }
673
674 /**
675 * drm_gem_for_each_gpuvm_bo() - iterator to walk over a list of &drm_gpuvm_bo
676 * @entry__: &drm_gpuvm_bo structure to assign to in each iteration step
677 * @obj__: the &drm_gem_object the &drm_gpuvm_bo to walk are associated with
678 *
679 * This iterator walks over all &drm_gpuvm_bo structures associated with the
680 * &drm_gem_object.
681 */
682 #define drm_gem_for_each_gpuvm_bo(entry__, obj__) \
683 list_for_each_entry(entry__, &(obj__)->gpuva.list, list.entry.gem)
684
685 /**
686 * drm_gem_for_each_gpuvm_bo_safe() - iterator to safely walk over a list of
687 * &drm_gpuvm_bo
688 * @entry__: &drm_gpuvm_bostructure to assign to in each iteration step
689 * @next__: &next &drm_gpuvm_bo to store the next step
690 * @obj__: the &drm_gem_object the &drm_gpuvm_bo to walk are associated with
691 *
692 * This iterator walks over all &drm_gpuvm_bo structures associated with the
693 * &drm_gem_object. It is implemented with list_for_each_entry_safe(), hence
694 * it is save against removal of elements.
695 */
696 #define drm_gem_for_each_gpuvm_bo_safe(entry__, next__, obj__) \
697 list_for_each_entry_safe(entry__, next__, &(obj__)->gpuva.list, list.entry.gem)
698
699 #endif /* __DRM_GEM_H__ */
700