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;
159 drm_vma_node_reset(&obj
->vma_node
);
161 EXPORT_SYMBOL(drm_gem_private_object_init
);
164 * Allocate a GEM object of the specified size with shmfs backing store
166 struct drm_gem_object
*
167 drm_gem_object_alloc(struct drm_device
*dev
, size_t size
)
169 struct drm_gem_object
*obj
;
171 obj
= kzalloc(sizeof(*obj
), GFP_KERNEL
);
175 if (drm_gem_object_init(dev
, obj
, size
) != 0)
178 if (dev
->driver
->gem_init_object
!= NULL
&&
179 dev
->driver
->gem_init_object(obj
) != 0) {
184 /* Object_init mangles the global counters - readjust them. */
190 EXPORT_SYMBOL(drm_gem_object_alloc
);
193 drm_gem_remove_prime_handles(struct drm_gem_object
*obj
, struct drm_file
*filp
)
196 * Note: obj->dma_buf can't disappear as long as we still hold a
197 * handle reference in obj->handle_count.
199 mutex_lock(&filp
->prime
.lock
);
201 drm_prime_remove_buf_handle_locked(&filp
->prime
,
204 mutex_unlock(&filp
->prime
.lock
);
207 static void drm_gem_object_ref_bug(struct kref
*list_kref
)
213 * Called after the last handle to the object has been closed
215 * Removes any name for the object. Note that this must be
216 * called before drm_gem_object_free or we'll be touching
219 static void drm_gem_object_handle_free(struct drm_gem_object
*obj
)
221 struct drm_device
*dev
= obj
->dev
;
223 /* Remove any name for this object */
225 idr_remove(&dev
->object_name_idr
, obj
->name
);
228 * The object name held a reference to this object, drop
231 * This cannot be the last reference, since the handle holds one too.
233 kref_put(&obj
->refcount
, drm_gem_object_ref_bug
);
237 static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object
*obj
)
239 /* Unbreak the reference cycle if we have an exported dma_buf. */
241 dma_buf_put(obj
->dma_buf
);
247 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object
*obj
)
249 if (WARN_ON(obj
->handle_count
== 0))
253 * Must bump handle count first as this may be the last
254 * ref, in which case the object would disappear before we
258 mutex_lock(&obj
->dev
->object_name_lock
);
259 if (--obj
->handle_count
== 0) {
260 drm_gem_object_handle_free(obj
);
261 drm_gem_object_exported_dma_buf_free(obj
);
263 mutex_unlock(&obj
->dev
->object_name_lock
);
265 drm_gem_object_unreference_unlocked(obj
);
269 * Removes the mapping from handle to filp for this object.
272 drm_gem_handle_delete(struct drm_file
*filp
, u32 handle
)
274 struct drm_device
*dev
;
275 struct drm_gem_object
*obj
;
277 /* This is gross. The idr system doesn't let us try a delete and
278 * return an error code. It just spews if you fail at deleting.
279 * So, we have to grab a lock around finding the object and then
280 * doing the delete on it and dropping the refcount, or the user
281 * could race us to double-decrement the refcount and cause a
282 * use-after-free later. Given the frequency of our handle lookups,
283 * we may want to use ida for number allocation and a hash table
284 * for the pointers, anyway.
286 spin_lock(&filp
->table_lock
);
288 /* Check if we currently have a reference on the object */
289 obj
= idr_find(&filp
->object_idr
, handle
);
291 spin_unlock(&filp
->table_lock
);
296 /* Release reference and decrement refcount. */
297 idr_remove(&filp
->object_idr
, handle
);
298 spin_unlock(&filp
->table_lock
);
300 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
301 drm_gem_remove_prime_handles(obj
, filp
);
302 drm_vma_node_revoke(&obj
->vma_node
, filp
->filp
);
304 if (dev
->driver
->gem_close_object
)
305 dev
->driver
->gem_close_object(obj
, filp
);
306 drm_gem_object_handle_unreference_unlocked(obj
);
310 EXPORT_SYMBOL(drm_gem_handle_delete
);
313 * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers
315 * This implements the ->dumb_destroy kms driver callback for drivers which use
316 * gem to manage their backing storage.
318 int drm_gem_dumb_destroy(struct drm_file
*file
,
319 struct drm_device
*dev
,
322 return drm_gem_handle_delete(file
, handle
);
324 EXPORT_SYMBOL(drm_gem_dumb_destroy
);
327 * drm_gem_handle_create_tail - internal functions to create a handle
329 * This expects the dev->object_name_lock to be held already and will drop it
330 * before returning. Used to avoid races in establishing new handles when
331 * importing an object from either an flink name or a dma-buf.
334 drm_gem_handle_create_tail(struct drm_file
*file_priv
,
335 struct drm_gem_object
*obj
,
338 struct drm_device
*dev
= obj
->dev
;
341 WARN_ON(!mutex_is_locked(&dev
->object_name_lock
));
344 * Get the user-visible handle using idr. Preload and perform
345 * allocation under our spinlock.
347 idr_preload(GFP_KERNEL
);
348 spin_lock(&file_priv
->table_lock
);
350 ret
= idr_alloc(&file_priv
->object_idr
, obj
, 1, 0, GFP_NOWAIT
);
351 drm_gem_object_reference(obj
);
353 spin_unlock(&file_priv
->table_lock
);
355 mutex_unlock(&dev
->object_name_lock
);
357 drm_gem_object_handle_unreference_unlocked(obj
);
362 ret
= drm_vma_node_allow(&obj
->vma_node
, file_priv
->filp
);
364 drm_gem_handle_delete(file_priv
, *handlep
);
368 if (dev
->driver
->gem_open_object
) {
369 ret
= dev
->driver
->gem_open_object(obj
, file_priv
);
371 drm_gem_handle_delete(file_priv
, *handlep
);
380 * Create a handle for this object. This adds a handle reference
381 * to the object, which includes a regular reference count. Callers
382 * will likely want to dereference the object afterwards.
385 drm_gem_handle_create(struct drm_file
*file_priv
,
386 struct drm_gem_object
*obj
,
389 mutex_lock(&obj
->dev
->object_name_lock
);
391 return drm_gem_handle_create_tail(file_priv
, obj
, handlep
);
393 EXPORT_SYMBOL(drm_gem_handle_create
);
397 * drm_gem_free_mmap_offset - release a fake mmap offset for an object
398 * @obj: obj in question
400 * This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
403 drm_gem_free_mmap_offset(struct drm_gem_object
*obj
)
405 struct drm_device
*dev
= obj
->dev
;
406 struct drm_gem_mm
*mm
= dev
->mm_private
;
408 drm_vma_offset_remove(&mm
->vma_manager
, &obj
->vma_node
);
410 EXPORT_SYMBOL(drm_gem_free_mmap_offset
);
413 * drm_gem_create_mmap_offset_size - create a fake mmap offset for an object
414 * @obj: obj in question
415 * @size: the virtual size
417 * GEM memory mapping works by handing back to userspace a fake mmap offset
418 * it can use in a subsequent mmap(2) call. The DRM core code then looks
419 * up the object based on the offset and sets up the various memory mapping
422 * This routine allocates and attaches a fake offset for @obj, in cases where
423 * the virtual size differs from the physical size (ie. obj->size). Otherwise
424 * just use drm_gem_create_mmap_offset().
427 drm_gem_create_mmap_offset_size(struct drm_gem_object
*obj
, size_t size
)
429 struct drm_device
*dev
= obj
->dev
;
430 struct drm_gem_mm
*mm
= dev
->mm_private
;
432 return drm_vma_offset_add(&mm
->vma_manager
, &obj
->vma_node
,
435 EXPORT_SYMBOL(drm_gem_create_mmap_offset_size
);
438 * drm_gem_create_mmap_offset - create a fake mmap offset for an object
439 * @obj: obj in question
441 * GEM memory mapping works by handing back to userspace a fake mmap offset
442 * it can use in a subsequent mmap(2) call. The DRM core code then looks
443 * up the object based on the offset and sets up the various memory mapping
446 * This routine allocates and attaches a fake offset for @obj.
448 int drm_gem_create_mmap_offset(struct drm_gem_object
*obj
)
450 return drm_gem_create_mmap_offset_size(obj
, obj
->size
);
452 EXPORT_SYMBOL(drm_gem_create_mmap_offset
);
455 * drm_gem_get_pages - helper to allocate backing pages for a GEM object
457 * @obj: obj in question
458 * @gfpmask: gfp mask of requested pages
460 struct page
**drm_gem_get_pages(struct drm_gem_object
*obj
, gfp_t gfpmask
)
463 struct address_space
*mapping
;
464 struct page
*p
, **pages
;
467 /* This is the shared memory object that backs the GEM resource */
468 inode
= file_inode(obj
->filp
);
469 mapping
= inode
->i_mapping
;
471 /* We already BUG_ON() for non-page-aligned sizes in
472 * drm_gem_object_init(), so we should never hit this unless
473 * driver author is doing something really wrong:
475 WARN_ON((obj
->size
& (PAGE_SIZE
- 1)) != 0);
477 npages
= obj
->size
>> PAGE_SHIFT
;
479 pages
= drm_malloc_ab(npages
, sizeof(struct page
*));
481 return ERR_PTR(-ENOMEM
);
483 gfpmask
|= mapping_gfp_mask(mapping
);
485 for (i
= 0; i
< npages
; i
++) {
486 p
= shmem_read_mapping_page_gfp(mapping
, i
, gfpmask
);
491 /* There is a hypothetical issue w/ drivers that require
492 * buffer memory in the low 4GB.. if the pages are un-
493 * pinned, and swapped out, they can end up swapped back
494 * in above 4GB. If pages are already in memory, then
495 * shmem_read_mapping_page_gfp will ignore the gfpmask,
496 * even if the already in-memory page disobeys the mask.
498 * It is only a theoretical issue today, because none of
499 * the devices with this limitation can be populated with
500 * enough memory to trigger the issue. But this BUG_ON()
501 * is here as a reminder in case the problem with
502 * shmem_read_mapping_page_gfp() isn't solved by the time
503 * it does become a real issue.
505 * See this thread: http://lkml.org/lkml/2011/7/11/238
507 BUG_ON((gfpmask
& __GFP_DMA32
) &&
508 (page_to_pfn(p
) >= 0x00100000UL
));
515 page_cache_release(pages
[i
]);
517 drm_free_large(pages
);
520 EXPORT_SYMBOL(drm_gem_get_pages
);
523 * drm_gem_put_pages - helper to free backing pages for a GEM object
524 * @obj: obj in question
525 * @pages: pages to free
526 * @dirty: if true, pages will be marked as dirty
527 * @accessed: if true, the pages will be marked as accessed
529 void drm_gem_put_pages(struct drm_gem_object
*obj
, struct page
**pages
,
530 bool dirty
, bool accessed
)
534 /* We already BUG_ON() for non-page-aligned sizes in
535 * drm_gem_object_init(), so we should never hit this unless
536 * driver author is doing something really wrong:
538 WARN_ON((obj
->size
& (PAGE_SIZE
- 1)) != 0);
540 npages
= obj
->size
>> PAGE_SHIFT
;
542 for (i
= 0; i
< npages
; i
++) {
544 set_page_dirty(pages
[i
]);
547 mark_page_accessed(pages
[i
]);
549 /* Undo the reference we took when populating the table */
550 page_cache_release(pages
[i
]);
553 drm_free_large(pages
);
555 EXPORT_SYMBOL(drm_gem_put_pages
);
557 /** Returns a reference to the object named by the handle. */
558 struct drm_gem_object
*
559 drm_gem_object_lookup(struct drm_device
*dev
, struct drm_file
*filp
,
562 struct drm_gem_object
*obj
;
564 spin_lock(&filp
->table_lock
);
566 /* Check if we currently have a reference on the object */
567 obj
= idr_find(&filp
->object_idr
, handle
);
569 spin_unlock(&filp
->table_lock
);
573 drm_gem_object_reference(obj
);
575 spin_unlock(&filp
->table_lock
);
579 EXPORT_SYMBOL(drm_gem_object_lookup
);
582 * Releases the handle to an mm object.
585 drm_gem_close_ioctl(struct drm_device
*dev
, void *data
,
586 struct drm_file
*file_priv
)
588 struct drm_gem_close
*args
= data
;
591 if (!(dev
->driver
->driver_features
& DRIVER_GEM
))
594 ret
= drm_gem_handle_delete(file_priv
, args
->handle
);
600 * Create a global name for an object, returning the name.
602 * Note that the name does not hold a reference; when the object
603 * is freed, the name goes away.
606 drm_gem_flink_ioctl(struct drm_device
*dev
, void *data
,
607 struct drm_file
*file_priv
)
609 struct drm_gem_flink
*args
= data
;
610 struct drm_gem_object
*obj
;
613 if (!(dev
->driver
->driver_features
& DRIVER_GEM
))
616 obj
= drm_gem_object_lookup(dev
, file_priv
, args
->handle
);
620 mutex_lock(&dev
->object_name_lock
);
621 idr_preload(GFP_KERNEL
);
622 /* prevent races with concurrent gem_close. */
623 if (obj
->handle_count
== 0) {
629 ret
= idr_alloc(&dev
->object_name_idr
, obj
, 1, 0, GFP_NOWAIT
);
635 /* Allocate a reference for the name table. */
636 drm_gem_object_reference(obj
);
639 args
->name
= (uint64_t) obj
->name
;
644 mutex_unlock(&dev
->object_name_lock
);
645 drm_gem_object_unreference_unlocked(obj
);
650 * Open an object using the global name, returning a handle and the size.
652 * This handle (of course) holds a reference to the object, so the object
653 * will not go away until the handle is deleted.
656 drm_gem_open_ioctl(struct drm_device
*dev
, void *data
,
657 struct drm_file
*file_priv
)
659 struct drm_gem_open
*args
= data
;
660 struct drm_gem_object
*obj
;
664 if (!(dev
->driver
->driver_features
& DRIVER_GEM
))
667 mutex_lock(&dev
->object_name_lock
);
668 obj
= idr_find(&dev
->object_name_idr
, (int) args
->name
);
670 drm_gem_object_reference(obj
);
672 mutex_unlock(&dev
->object_name_lock
);
676 /* drm_gem_handle_create_tail unlocks dev->object_name_lock. */
677 ret
= drm_gem_handle_create_tail(file_priv
, obj
, &handle
);
678 drm_gem_object_unreference_unlocked(obj
);
682 args
->handle
= handle
;
683 args
->size
= obj
->size
;
689 * Called at device open time, sets up the structure for handling refcounting
693 drm_gem_open(struct drm_device
*dev
, struct drm_file
*file_private
)
695 idr_init(&file_private
->object_idr
);
696 spin_lock_init(&file_private
->table_lock
);
700 * Called at device close to release the file's
701 * handle references on objects.
704 drm_gem_object_release_handle(int id
, void *ptr
, void *data
)
706 struct drm_file
*file_priv
= data
;
707 struct drm_gem_object
*obj
= ptr
;
708 struct drm_device
*dev
= obj
->dev
;
710 if (drm_core_check_feature(dev
, DRIVER_PRIME
))
711 drm_gem_remove_prime_handles(obj
, file_priv
);
712 drm_vma_node_revoke(&obj
->vma_node
, file_priv
->filp
);
714 if (dev
->driver
->gem_close_object
)
715 dev
->driver
->gem_close_object(obj
, file_priv
);
717 drm_gem_object_handle_unreference_unlocked(obj
);
723 * Called at close time when the filp is going away.
725 * Releases any remaining references on objects by this filp.
728 drm_gem_release(struct drm_device
*dev
, struct drm_file
*file_private
)
730 idr_for_each(&file_private
->object_idr
,
731 &drm_gem_object_release_handle
, file_private
);
732 idr_destroy(&file_private
->object_idr
);
736 drm_gem_object_release(struct drm_gem_object
*obj
)
738 WARN_ON(obj
->dma_buf
);
743 EXPORT_SYMBOL(drm_gem_object_release
);
746 * Called after the last reference to the object has been lost.
747 * Must be called holding struct_ mutex
752 drm_gem_object_free(struct kref
*kref
)
754 struct drm_gem_object
*obj
= (struct drm_gem_object
*) kref
;
755 struct drm_device
*dev
= obj
->dev
;
757 BUG_ON(!mutex_is_locked(&dev
->struct_mutex
));
759 if (dev
->driver
->gem_free_object
!= NULL
)
760 dev
->driver
->gem_free_object(obj
);
762 EXPORT_SYMBOL(drm_gem_object_free
);
764 void drm_gem_vm_open(struct vm_area_struct
*vma
)
766 struct drm_gem_object
*obj
= vma
->vm_private_data
;
768 drm_gem_object_reference(obj
);
770 mutex_lock(&obj
->dev
->struct_mutex
);
771 drm_vm_open_locked(obj
->dev
, vma
);
772 mutex_unlock(&obj
->dev
->struct_mutex
);
774 EXPORT_SYMBOL(drm_gem_vm_open
);
776 void drm_gem_vm_close(struct vm_area_struct
*vma
)
778 struct drm_gem_object
*obj
= vma
->vm_private_data
;
779 struct drm_device
*dev
= obj
->dev
;
781 mutex_lock(&dev
->struct_mutex
);
782 drm_vm_close_locked(obj
->dev
, vma
);
783 drm_gem_object_unreference(obj
);
784 mutex_unlock(&dev
->struct_mutex
);
786 EXPORT_SYMBOL(drm_gem_vm_close
);
789 * drm_gem_mmap_obj - memory map a GEM object
790 * @obj: the GEM object to map
791 * @obj_size: the object size to be mapped, in bytes
792 * @vma: VMA for the area to be mapped
794 * Set up the VMA to prepare mapping of the GEM object using the gem_vm_ops
795 * provided by the driver. Depending on their requirements, drivers can either
796 * provide a fault handler in their gem_vm_ops (in which case any accesses to
797 * the object will be trapped, to perform migration, GTT binding, surface
798 * register allocation, or performance monitoring), or mmap the buffer memory
799 * synchronously after calling drm_gem_mmap_obj.
801 * This function is mainly intended to implement the DMABUF mmap operation, when
802 * the GEM object is not looked up based on its fake offset. To implement the
803 * DRM mmap operation, drivers should use the drm_gem_mmap() function.
805 * drm_gem_mmap_obj() assumes the user is granted access to the buffer while
806 * drm_gem_mmap() prevents unprivileged users from mapping random objects. So
807 * callers must verify access restrictions before calling this helper.
809 * NOTE: This function has to be protected with dev->struct_mutex
811 * Return 0 or success or -EINVAL if the object size is smaller than the VMA
812 * size, or if no gem_vm_ops are provided.
814 int drm_gem_mmap_obj(struct drm_gem_object
*obj
, unsigned long obj_size
,
815 struct vm_area_struct
*vma
)
817 struct drm_device
*dev
= obj
->dev
;
819 lockdep_assert_held(&dev
->struct_mutex
);
821 /* Check for valid size. */
822 if (obj_size
< vma
->vm_end
- vma
->vm_start
)
825 if (!dev
->driver
->gem_vm_ops
)
828 vma
->vm_flags
|= VM_IO
| VM_PFNMAP
| VM_DONTEXPAND
| VM_DONTDUMP
;
829 vma
->vm_ops
= dev
->driver
->gem_vm_ops
;
830 vma
->vm_private_data
= obj
;
831 vma
->vm_page_prot
= pgprot_writecombine(vm_get_page_prot(vma
->vm_flags
));
833 /* Take a ref for this mapping of the object, so that the fault
834 * handler can dereference the mmap offset's pointer to the object.
835 * This reference is cleaned up by the corresponding vm_close
836 * (which should happen whether the vma was created by this call, or
837 * by a vm_open due to mremap or partial unmap or whatever).
839 drm_gem_object_reference(obj
);
841 drm_vm_open_locked(dev
, vma
);
844 EXPORT_SYMBOL(drm_gem_mmap_obj
);
847 * drm_gem_mmap - memory map routine for GEM objects
848 * @filp: DRM file pointer
849 * @vma: VMA for the area to be mapped
851 * If a driver supports GEM object mapping, mmap calls on the DRM file
852 * descriptor will end up here.
854 * Look up the GEM object based on the offset passed in (vma->vm_pgoff will
855 * contain the fake offset we created when the GTT map ioctl was called on
856 * the object) and map it with a call to drm_gem_mmap_obj().
858 * If the caller is not granted access to the buffer object, the mmap will fail
859 * with EACCES. Please see the vma manager for more information.
861 int drm_gem_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
863 struct drm_file
*priv
= filp
->private_data
;
864 struct drm_device
*dev
= priv
->minor
->dev
;
865 struct drm_gem_mm
*mm
= dev
->mm_private
;
866 struct drm_gem_object
*obj
;
867 struct drm_vma_offset_node
*node
;
870 if (drm_device_is_unplugged(dev
))
873 mutex_lock(&dev
->struct_mutex
);
875 node
= drm_vma_offset_exact_lookup(&mm
->vma_manager
, vma
->vm_pgoff
,
878 mutex_unlock(&dev
->struct_mutex
);
879 return drm_mmap(filp
, vma
);
880 } else if (!drm_vma_node_is_allowed(node
, filp
)) {
881 mutex_unlock(&dev
->struct_mutex
);
885 obj
= container_of(node
, struct drm_gem_object
, vma_node
);
886 ret
= drm_gem_mmap_obj(obj
, drm_vma_node_size(node
) << PAGE_SHIFT
, vma
);
888 mutex_unlock(&dev
->struct_mutex
);
892 EXPORT_SYMBOL(drm_gem_mmap
);