2 * Copyright © 2008 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
28 #include <linux/types.h>
29 #include <linux/slab.h>
31 #include <linux/uaccess.h>
33 #include <linux/file.h>
34 #include <linux/module.h>
35 #include <linux/mman.h>
36 #include <linux/pagemap.h>
37 #include <linux/shmem_fs.h>
38 #include <linux/dma-buf.h>
40 #include <drm/drm_vma_manager.h>
44 * This file provides some of the base ioctls and library routines for
45 * the graphics memory manager implemented by each device driver.
47 * Because various devices have different requirements in terms of
48 * synchronization and migration strategies, implementing that is left up to
49 * the driver, and all that the general API provides should be generic --
50 * allocating objects, reading/writing data with the cpu, freeing objects.
51 * Even there, platform-dependent optimizations for reading/writing data with
52 * the CPU mean we'll likely hook those out to driver-specific calls. However,
53 * the DRI2 implementation wants to have at least allocate/mmap be generic.
55 * The goal was to have swap-backed object allocation managed through
56 * struct file. However, file descriptors as handles to a struct file have
58 * - Process limits prevent more than 1024 or so being used at a time by
60 * - Inability to allocate high fds will aggravate the X Server's select()
61 * handling, and likely that of many GL client applications as well.
63 * This led to a plan of using our own integer IDs (called handles, following
64 * DRM terminology) to mimic fds, and implement the fd syscalls we need as
65 * ioctls. The objects themselves will still include the struct file so
66 * that we can transition to fds if the required kernel infrastructure shows
67 * up at a later date, and as our interface with shmfs for memory allocation.
71 * We make up offsets for buffer objects so we can recognize them at
75 /* pgoff in mmap is an unsigned long, so we need to make sure that
76 * the faked up offset will fit
79 #if BITS_PER_LONG == 64
80 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
81 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
83 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
84 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
88 * Initialize the GEM device fields
92 drm_gem_init(struct drm_device
*dev
)
94 struct drm_gem_mm
*mm
;
96 mutex_init(&dev
->object_name_lock
);
97 idr_init(&dev
->object_name_idr
);
99 mm
= kzalloc(sizeof(struct drm_gem_mm
), GFP_KERNEL
);
101 DRM_ERROR("out of memory\n");
105 dev
->mm_private
= mm
;
106 drm_vma_offset_manager_init(&mm
->vma_manager
,
107 DRM_FILE_PAGE_OFFSET_START
,
108 DRM_FILE_PAGE_OFFSET_SIZE
);
114 drm_gem_destroy(struct drm_device
*dev
)
116 struct drm_gem_mm
*mm
= dev
->mm_private
;
118 drm_vma_offset_manager_destroy(&mm
->vma_manager
);
120 dev
->mm_private
= NULL
;
124 * Initialize an already allocated GEM object of the specified size with
125 * shmfs backing store.
127 int drm_gem_object_init(struct drm_device
*dev
,
128 struct drm_gem_object
*obj
, size_t size
)
132 filp
= shmem_file_setup("drm mm object", size
, VM_NORESERVE
);
134 return PTR_ERR(filp
);
136 drm_gem_private_object_init(dev
, obj
, size
);
141 EXPORT_SYMBOL(drm_gem_object_init
);
144 * Initialize an already allocated GEM object of the specified size with
145 * no GEM provided backing store. Instead the caller is responsible for
146 * backing the object and handling it.
148 void drm_gem_private_object_init(struct drm_device
*dev
,
149 struct drm_gem_object
*obj
, size_t size
)
151 BUG_ON((size
& (PAGE_SIZE
- 1)) != 0);
156 kref_init(&obj
->refcount
);
157 obj
->handle_count
= 0;
160 EXPORT_SYMBOL(drm_gem_private_object_init
);
163 * Allocate a GEM object of the specified size with shmfs backing store
165 struct drm_gem_object
*
166 drm_gem_object_alloc(struct drm_device
*dev
, size_t size
)
168 struct drm_gem_object
*obj
;
170 obj
= kzalloc(sizeof(*obj
), GFP_KERNEL
);
174 if (drm_gem_object_init(dev
, obj
, size
) != 0)
177 if (dev
->driver
->gem_init_object
!= NULL
&&
178 dev
->driver
->gem_init_object(obj
) != 0) {
183 /* Object_init mangles the global counters - readjust them. */
189 EXPORT_SYMBOL(drm_gem_object_alloc
);
192 drm_gem_remove_prime_handles(struct drm_gem_object
*obj
, struct drm_file
*filp
)
194 if (obj
->import_attach
) {
195 drm_prime_remove_buf_handle(&filp
->prime
,
196 obj
->import_attach
->dmabuf
);
198 if (obj
->export_dma_buf
) {
199 drm_prime_remove_buf_handle(&filp
->prime
,
200 obj
->export_dma_buf
);
204 static void drm_gem_object_ref_bug(struct kref
*list_kref
)
210 * Called after the last handle to the object has been closed
212 * Removes any name for the object. Note that this must be
213 * called before drm_gem_object_free or we'll be touching
216 static void drm_gem_object_handle_free(struct drm_gem_object
*obj
)
218 struct drm_device
*dev
= obj
->dev
;
220 /* Remove any name for this object */
222 idr_remove(&dev
->object_name_idr
, obj
->name
);
225 * The object name held a reference to this object, drop
228 * This cannot be the last reference, since the handle holds one too.
230 kref_put(&obj
->refcount
, drm_gem_object_ref_bug
);
235 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object
*obj
)
237 if (WARN_ON(obj
->handle_count
== 0))
241 * Must bump handle count first as this may be the last
242 * ref, in which case the object would disappear before we
246 mutex_lock(&obj
->dev
->object_name_lock
);
247 if (--obj
->handle_count
== 0)
248 drm_gem_object_handle_free(obj
);
249 mutex_unlock(&obj
->dev
->object_name_lock
);
251 drm_gem_object_unreference_unlocked(obj
);
255 * Removes the mapping from handle to filp for this object.
258 drm_gem_handle_delete(struct drm_file
*filp
, u32 handle
)
260 struct drm_device
*dev
;
261 struct drm_gem_object
*obj
;
263 /* This is gross. The idr system doesn't let us try a delete and
264 * return an error code. It just spews if you fail at deleting.
265 * So, we have to grab a lock around finding the object and then
266 * doing the delete on it and dropping the refcount, or the user
267 * could race us to double-decrement the refcount and cause a
268 * use-after-free later. Given the frequency of our handle lookups,
269 * we may want to use ida for number allocation and a hash table
270 * for the pointers, anyway.
272 spin_lock(&filp
->table_lock
);
274 /* Check if we currently have a reference on the object */
275 obj
= idr_find(&filp
->object_idr
, handle
);
277 spin_unlock(&filp
->table_lock
);
282 /* Release reference and decrement refcount. */
283 idr_remove(&filp
->object_idr
, handle
);
284 spin_unlock(&filp
->table_lock
);
286 drm_gem_remove_prime_handles(obj
, filp
);
288 if (dev
->driver
->gem_close_object
)
289 dev
->driver
->gem_close_object(obj
, filp
);
290 drm_gem_object_handle_unreference_unlocked(obj
);
294 EXPORT_SYMBOL(drm_gem_handle_delete
);
297 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
299 * This implements the ->dumb_destroy kms driver callback for drivers which use
300 * gem to manage their backing storage.
302 int drm_gem_dumb_destroy(struct drm_file
*file
,
303 struct drm_device
*dev
,
306 return drm_gem_handle_delete(file
, handle
);
308 EXPORT_SYMBOL(drm_gem_dumb_destroy
);
311 * Create a handle for this object. This adds a handle reference
312 * to the object, which includes a regular reference count. Callers
313 * will likely want to dereference the object afterwards.
316 drm_gem_handle_create(struct drm_file
*file_priv
,
317 struct drm_gem_object
*obj
,
320 struct drm_device
*dev
= obj
->dev
;
324 * Get the user-visible handle using idr. Preload and perform
325 * allocation under our spinlock.
327 mutex_lock(&dev
->object_name_lock
);
328 idr_preload(GFP_KERNEL
);
329 spin_lock(&file_priv
->table_lock
);
331 ret
= idr_alloc(&file_priv
->object_idr
, obj
, 1, 0, GFP_NOWAIT
);
332 drm_gem_object_reference(obj
);
334 spin_unlock(&file_priv
->table_lock
);
336 mutex_unlock(&dev
->object_name_lock
);
338 drm_gem_object_handle_unreference_unlocked(obj
);
344 if (dev
->driver
->gem_open_object
) {
345 ret
= dev
->driver
->gem_open_object(obj
, file_priv
);
347 drm_gem_handle_delete(file_priv
, *handlep
);
354 EXPORT_SYMBOL(drm_gem_handle_create
);
358 * drm_gem_free_mmap_offset - release a fake mmap offset for an object
359 * @obj: obj in question
361 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
364 drm_gem_free_mmap_offset(struct drm_gem_object
*obj
)
366 struct drm_device
*dev
= obj
->dev
;
367 struct drm_gem_mm
*mm
= dev
->mm_private
;
369 drm_vma_offset_remove(&mm
->vma_manager
, &obj
->vma_node
);
371 EXPORT_SYMBOL(drm_gem_free_mmap_offset
);
374 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
375 * @obj: obj in question
376 * @size: the virtual size
378 * GEM memory mapping works by handing back to userspace a fake mmap offset
379 * it can use in a subsequent mmap(2) call. The DRM core code then looks
380 * up the object based on the offset and sets up the various memory mapping
383 * This routine allocates and attaches a fake offset for @obj, in cases where
384 * the virtual size differs from the physical size (ie. obj->size). Otherwise
385 * just use drm_gem_create_mmap_offset().
388 drm_gem_create_mmap_offset_size(struct drm_gem_object
*obj
, size_t size
)
390 struct drm_device
*dev
= obj
->dev
;
391 struct drm_gem_mm
*mm
= dev
->mm_private
;
393 return drm_vma_offset_add(&mm
->vma_manager
, &obj
->vma_node
,
396 EXPORT_SYMBOL(drm_gem_create_mmap_offset_size
);
399 * drm_gem_create_mmap_offset - create a fake mmap offset for an object
400 * @obj: obj in question
402 * GEM memory mapping works by handing back to userspace a fake mmap offset
403 * it can use in a subsequent mmap(2) call. The DRM core code then looks
404 * up the object based on the offset and sets up the various memory mapping
407 * This routine allocates and attaches a fake offset for @obj.
409 int drm_gem_create_mmap_offset(struct drm_gem_object
*obj
)
411 return drm_gem_create_mmap_offset_size(obj
, obj
->size
);
413 EXPORT_SYMBOL(drm_gem_create_mmap_offset
);
416 * drm_gem_get_pages - helper to allocate backing pages for a GEM object
418 * @obj: obj in question
419 * @gfpmask: gfp mask of requested pages
421 struct page
**drm_gem_get_pages(struct drm_gem_object
*obj
, gfp_t gfpmask
)
424 struct address_space
*mapping
;
425 struct page
*p
, **pages
;
428 /* This is the shared memory object that backs the GEM resource */
429 inode
= file_inode(obj
->filp
);
430 mapping
= inode
->i_mapping
;
432 /* We already BUG_ON() for non-page-aligned sizes in
433 * drm_gem_object_init(), so we should never hit this unless
434 * driver author is doing something really wrong:
436 WARN_ON((obj
->size
& (PAGE_SIZE
- 1)) != 0);
438 npages
= obj
->size
>> PAGE_SHIFT
;
440 pages
= drm_malloc_ab(npages
, sizeof(struct page
*));
442 return ERR_PTR(-ENOMEM
);
444 gfpmask
|= mapping_gfp_mask(mapping
);
446 for (i
= 0; i
< npages
; i
++) {
447 p
= shmem_read_mapping_page_gfp(mapping
, i
, gfpmask
);
452 /* There is a hypothetical issue w/ drivers that require
453 * buffer memory in the low 4GB.. if the pages are un-
454 * pinned, and swapped out, they can end up swapped back
455 * in above 4GB. If pages are already in memory, then
456 * shmem_read_mapping_page_gfp will ignore the gfpmask,
457 * even if the already in-memory page disobeys the mask.
459 * It is only a theoretical issue today, because none of
460 * the devices with this limitation can be populated with
461 * enough memory to trigger the issue. But this BUG_ON()
462 * is here as a reminder in case the problem with
463 * shmem_read_mapping_page_gfp() isn't solved by the time
464 * it does become a real issue.
466 * See this thread: http://lkml.org/lkml/2011/7/11/238
468 BUG_ON((gfpmask
& __GFP_DMA32
) &&
469 (page_to_pfn(p
) >= 0x00100000UL
));
476 page_cache_release(pages
[i
]);
478 drm_free_large(pages
);
481 EXPORT_SYMBOL(drm_gem_get_pages
);
484 * drm_gem_put_pages - helper to free backing pages for a GEM object
485 * @obj: obj in question
486 * @pages: pages to free
487 * @dirty: if true, pages will be marked as dirty
488 * @accessed: if true, the pages will be marked as accessed
490 void drm_gem_put_pages(struct drm_gem_object
*obj
, struct page
**pages
,
491 bool dirty
, bool accessed
)
495 /* We already BUG_ON() for non-page-aligned sizes in
496 * drm_gem_object_init(), so we should never hit this unless
497 * driver author is doing something really wrong:
499 WARN_ON((obj
->size
& (PAGE_SIZE
- 1)) != 0);
501 npages
= obj
->size
>> PAGE_SHIFT
;
503 for (i
= 0; i
< npages
; i
++) {
505 set_page_dirty(pages
[i
]);
508 mark_page_accessed(pages
[i
]);
510 /* Undo the reference we took when populating the table */
511 page_cache_release(pages
[i
]);
514 drm_free_large(pages
);
516 EXPORT_SYMBOL(drm_gem_put_pages
);
518 /** Returns a reference to the object named by the handle. */
519 struct drm_gem_object
*
520 drm_gem_object_lookup(struct drm_device
*dev
, struct drm_file
*filp
,
523 struct drm_gem_object
*obj
;
525 spin_lock(&filp
->table_lock
);
527 /* Check if we currently have a reference on the object */
528 obj
= idr_find(&filp
->object_idr
, handle
);
530 spin_unlock(&filp
->table_lock
);
534 drm_gem_object_reference(obj
);
536 spin_unlock(&filp
->table_lock
);
540 EXPORT_SYMBOL(drm_gem_object_lookup
);
543 * Releases the handle to an mm object.
546 drm_gem_close_ioctl(struct drm_device
*dev
, void *data
,
547 struct drm_file
*file_priv
)
549 struct drm_gem_close
*args
= data
;
552 if (!(dev
->driver
->driver_features
& DRIVER_GEM
))
555 ret
= drm_gem_handle_delete(file_priv
, args
->handle
);
561 * Create a global name for an object, returning the name.
563 * Note that the name does not hold a reference; when the object
564 * is freed, the name goes away.
567 drm_gem_flink_ioctl(struct drm_device
*dev
, void *data
,
568 struct drm_file
*file_priv
)
570 struct drm_gem_flink
*args
= data
;
571 struct drm_gem_object
*obj
;
574 if (!(dev
->driver
->driver_features
& DRIVER_GEM
))
577 obj
= drm_gem_object_lookup(dev
, file_priv
, args
->handle
);
581 mutex_lock(&dev
->object_name_lock
);
582 idr_preload(GFP_KERNEL
);
583 /* prevent races with concurrent gem_close. */
584 if (obj
->handle_count
== 0) {
590 ret
= idr_alloc(&dev
->object_name_idr
, obj
, 1, 0, GFP_NOWAIT
);
596 /* Allocate a reference for the name table. */
597 drm_gem_object_reference(obj
);
600 args
->name
= (uint64_t) obj
->name
;
605 mutex_unlock(&dev
->object_name_lock
);
606 drm_gem_object_unreference_unlocked(obj
);
611 * Open an object using the global name, returning a handle and the size.
613 * This handle (of course) holds a reference to the object, so the object
614 * will not go away until the handle is deleted.
617 drm_gem_open_ioctl(struct drm_device
*dev
, void *data
,
618 struct drm_file
*file_priv
)
620 struct drm_gem_open
*args
= data
;
621 struct drm_gem_object
*obj
;
625 if (!(dev
->driver
->driver_features
& DRIVER_GEM
))
628 mutex_lock(&dev
->object_name_lock
);
629 obj
= idr_find(&dev
->object_name_idr
, (int) args
->name
);
631 drm_gem_object_reference(obj
);
632 mutex_unlock(&dev
->object_name_lock
);
636 ret
= drm_gem_handle_create(file_priv
, obj
, &handle
);
637 drm_gem_object_unreference_unlocked(obj
);
641 args
->handle
= handle
;
642 args
->size
= obj
->size
;
648 * Called at device open time, sets up the structure for handling refcounting
652 drm_gem_open(struct drm_device
*dev
, struct drm_file
*file_private
)
654 idr_init(&file_private
->object_idr
);
655 spin_lock_init(&file_private
->table_lock
);
659 * Called at device close to release the file's
660 * handle references on objects.
663 drm_gem_object_release_handle(int id
, void *ptr
, void *data
)
665 struct drm_file
*file_priv
= data
;
666 struct drm_gem_object
*obj
= ptr
;
667 struct drm_device
*dev
= obj
->dev
;
669 drm_gem_remove_prime_handles(obj
, file_priv
);
671 if (dev
->driver
->gem_close_object
)
672 dev
->driver
->gem_close_object(obj
, file_priv
);
674 drm_gem_object_handle_unreference_unlocked(obj
);
680 * Called at close time when the filp is going away.
682 * Releases any remaining references on objects by this filp.
685 drm_gem_release(struct drm_device
*dev
, struct drm_file
*file_private
)
687 idr_for_each(&file_private
->object_idr
,
688 &drm_gem_object_release_handle
, file_private
);
689 idr_destroy(&file_private
->object_idr
);
693 drm_gem_object_release(struct drm_gem_object
*obj
)
698 EXPORT_SYMBOL(drm_gem_object_release
);
701 * Called after the last reference to the object has been lost.
702 * Must be called holding struct_ mutex
707 drm_gem_object_free(struct kref
*kref
)
709 struct drm_gem_object
*obj
= (struct drm_gem_object
*) kref
;
710 struct drm_device
*dev
= obj
->dev
;
712 BUG_ON(!mutex_is_locked(&dev
->struct_mutex
));
714 if (dev
->driver
->gem_free_object
!= NULL
)
715 dev
->driver
->gem_free_object(obj
);
717 EXPORT_SYMBOL(drm_gem_object_free
);
719 void drm_gem_vm_open(struct vm_area_struct
*vma
)
721 struct drm_gem_object
*obj
= vma
->vm_private_data
;
723 drm_gem_object_reference(obj
);
725 mutex_lock(&obj
->dev
->struct_mutex
);
726 drm_vm_open_locked(obj
->dev
, vma
);
727 mutex_unlock(&obj
->dev
->struct_mutex
);
729 EXPORT_SYMBOL(drm_gem_vm_open
);
731 void drm_gem_vm_close(struct vm_area_struct
*vma
)
733 struct drm_gem_object
*obj
= vma
->vm_private_data
;
734 struct drm_device
*dev
= obj
->dev
;
736 mutex_lock(&dev
->struct_mutex
);
737 drm_vm_close_locked(obj
->dev
, vma
);
738 drm_gem_object_unreference(obj
);
739 mutex_unlock(&dev
->struct_mutex
);
741 EXPORT_SYMBOL(drm_gem_vm_close
);
744 * drm_gem_mmap_obj - memory map a GEM object
745 * @obj: the GEM object to map
746 * @obj_size: the object size to be mapped, in bytes
747 * @vma: VMA for the area to be mapped
749 * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops
750 * provided by the driver. Depending on their requirements, drivers can either
751 * provide a fault handler in their gem_vm_ops (in which case any accesses to
752 * the object will be trapped, to perform migration, GTT binding, surface
753 * register allocation, or performance monitoring), or mmap the buffer memory
754 * synchronously after calling drm_gem_mmap_obj.
756 * This function is mainly intended to implement the DMABUF mmap operation, when
757 * the GEM object is not looked up based on its fake offset. To implement the
758 * DRM mmap operation, drivers should use the drm_gem_mmap() function.
760 * NOTE: This function has to be protected with dev->struct_mutex
762 * Return 0 or success or -EINVAL if the object size is smaller than the VMA
763 * size, or if no gem_vm_ops are provided.
765 int drm_gem_mmap_obj(struct drm_gem_object
*obj
, unsigned long obj_size
,
766 struct vm_area_struct
*vma
)
768 struct drm_device
*dev
= obj
->dev
;
770 lockdep_assert_held(&dev
->struct_mutex
);
772 /* Check for valid size. */
773 if (obj_size
< vma
->vm_end
- vma
->vm_start
)
776 if (!dev
->driver
->gem_vm_ops
)
779 vma
->vm_flags
|= VM_IO
| VM_PFNMAP
| VM_DONTEXPAND
| VM_DONTDUMP
;
780 vma
->vm_ops
= dev
->driver
->gem_vm_ops
;
781 vma
->vm_private_data
= obj
;
782 vma
->vm_page_prot
= pgprot_writecombine(vm_get_page_prot(vma
->vm_flags
));
784 /* Take a ref for this mapping of the object, so that the fault
785 * handler can dereference the mmap offset's pointer to the object.
786 * This reference is cleaned up by the corresponding vm_close
787 * (which should happen whether the vma was created by this call, or
788 * by a vm_open due to mremap or partial unmap or whatever).
790 drm_gem_object_reference(obj
);
792 drm_vm_open_locked(dev
, vma
);
795 EXPORT_SYMBOL(drm_gem_mmap_obj
);
798 * drm_gem_mmap - memory map routine for GEM objects
799 * @filp: DRM file pointer
800 * @vma: VMA for the area to be mapped
802 * If a driver supports GEM object mapping, mmap calls on the DRM file
803 * descriptor will end up here.
805 * Look up the GEM object based on the offset passed in (vma->vm_pgoff will
806 * contain the fake offset we created when the GTT map ioctl was called on
807 * the object) and map it with a call to drm_gem_mmap_obj().
809 int drm_gem_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
811 struct drm_file
*priv
= filp
->private_data
;
812 struct drm_device
*dev
= priv
->minor
->dev
;
813 struct drm_gem_mm
*mm
= dev
->mm_private
;
814 struct drm_gem_object
*obj
;
815 struct drm_vma_offset_node
*node
;
818 if (drm_device_is_unplugged(dev
))
821 mutex_lock(&dev
->struct_mutex
);
823 node
= drm_vma_offset_exact_lookup(&mm
->vma_manager
, vma
->vm_pgoff
,
826 mutex_unlock(&dev
->struct_mutex
);
827 return drm_mmap(filp
, vma
);
830 obj
= container_of(node
, struct drm_gem_object
, vma_node
);
831 ret
= drm_gem_mmap_obj(obj
, drm_vma_node_size(node
) << PAGE_SHIFT
, vma
);
833 mutex_unlock(&dev
->struct_mutex
);
837 EXPORT_SYMBOL(drm_gem_mmap
);