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);