2 * Copyright © 2012-2014 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
26 #include <drm/i915_drm.h>
28 #include "i915_trace.h"
29 #include "intel_drv.h"
30 #include <linux/mmu_context.h>
31 #include <linux/mmu_notifier.h>
32 #include <linux/mempolicy.h>
33 #include <linux/swap.h>
35 struct i915_mm_struct
{
37 struct drm_i915_private
*i915
;
38 struct i915_mmu_notifier
*mn
;
39 struct hlist_node node
;
41 struct work_struct work
;
44 #if defined(CONFIG_MMU_NOTIFIER)
45 #include <linux/interval_tree.h>
47 struct i915_mmu_notifier
{
49 struct hlist_node node
;
50 struct mmu_notifier mn
;
51 struct rb_root objects
;
52 struct workqueue_struct
*wq
;
55 struct i915_mmu_object
{
56 struct i915_mmu_notifier
*mn
;
57 struct drm_i915_gem_object
*obj
;
58 struct interval_tree_node it
;
59 struct list_head link
;
60 struct work_struct work
;
64 static void wait_rendering(struct drm_i915_gem_object
*obj
)
66 struct drm_device
*dev
= obj
->base
.dev
;
67 struct drm_i915_gem_request
*requests
[I915_NUM_ENGINES
];
74 for (i
= 0; i
< I915_NUM_ENGINES
; i
++) {
75 struct drm_i915_gem_request
*req
;
77 req
= obj
->last_read_req
[i
];
81 requests
[n
++] = i915_gem_request_reference(req
);
84 mutex_unlock(&dev
->struct_mutex
);
86 for (i
= 0; i
< n
; i
++)
87 __i915_wait_request(requests
[i
], false, NULL
, NULL
);
89 mutex_lock(&dev
->struct_mutex
);
91 for (i
= 0; i
< n
; i
++)
92 i915_gem_request_unreference(requests
[i
]);
95 static void cancel_userptr(struct work_struct
*work
)
97 struct i915_mmu_object
*mo
= container_of(work
, typeof(*mo
), work
);
98 struct drm_i915_gem_object
*obj
= mo
->obj
;
99 struct drm_device
*dev
= obj
->base
.dev
;
101 mutex_lock(&dev
->struct_mutex
);
102 /* Cancel any active worker and force us to re-evaluate gup */
103 obj
->userptr
.work
= NULL
;
105 if (obj
->pages
!= NULL
) {
106 struct drm_i915_private
*dev_priv
= to_i915(dev
);
107 struct i915_vma
*vma
, *tmp
;
108 bool was_interruptible
;
112 was_interruptible
= dev_priv
->mm
.interruptible
;
113 dev_priv
->mm
.interruptible
= false;
115 list_for_each_entry_safe(vma
, tmp
, &obj
->vma_list
, obj_link
)
116 WARN_ON(i915_vma_unbind(vma
));
117 WARN_ON(i915_gem_object_put_pages(obj
));
119 dev_priv
->mm
.interruptible
= was_interruptible
;
122 drm_gem_object_unreference(&obj
->base
);
123 mutex_unlock(&dev
->struct_mutex
);
126 static void add_object(struct i915_mmu_object
*mo
)
131 interval_tree_insert(&mo
->it
, &mo
->mn
->objects
);
135 static void del_object(struct i915_mmu_object
*mo
)
140 interval_tree_remove(&mo
->it
, &mo
->mn
->objects
);
141 mo
->attached
= false;
144 static void i915_gem_userptr_mn_invalidate_range_start(struct mmu_notifier
*_mn
,
145 struct mm_struct
*mm
,
149 struct i915_mmu_notifier
*mn
=
150 container_of(_mn
, struct i915_mmu_notifier
, mn
);
151 struct i915_mmu_object
*mo
;
152 struct interval_tree_node
*it
;
153 LIST_HEAD(cancelled
);
155 if (RB_EMPTY_ROOT(&mn
->objects
))
158 /* interval ranges are inclusive, but invalidate range is exclusive */
161 spin_lock(&mn
->lock
);
162 it
= interval_tree_iter_first(&mn
->objects
, start
, end
);
164 /* The mmu_object is released late when destroying the
165 * GEM object so it is entirely possible to gain a
166 * reference on an object in the process of being freed
167 * since our serialisation is via the spinlock and not
168 * the struct_mutex - and consequently use it after it
169 * is freed and then double free it. To prevent that
170 * use-after-free we only acquire a reference on the
171 * object if it is not in the process of being destroyed.
173 mo
= container_of(it
, struct i915_mmu_object
, it
);
174 if (kref_get_unless_zero(&mo
->obj
->base
.refcount
))
175 queue_work(mn
->wq
, &mo
->work
);
177 list_add(&mo
->link
, &cancelled
);
178 it
= interval_tree_iter_next(it
, start
, end
);
180 list_for_each_entry(mo
, &cancelled
, link
)
182 spin_unlock(&mn
->lock
);
184 flush_workqueue(mn
->wq
);
187 static const struct mmu_notifier_ops i915_gem_userptr_notifier
= {
188 .invalidate_range_start
= i915_gem_userptr_mn_invalidate_range_start
,
191 static struct i915_mmu_notifier
*
192 i915_mmu_notifier_create(struct mm_struct
*mm
)
194 struct i915_mmu_notifier
*mn
;
197 mn
= kmalloc(sizeof(*mn
), GFP_KERNEL
);
199 return ERR_PTR(-ENOMEM
);
201 spin_lock_init(&mn
->lock
);
202 mn
->mn
.ops
= &i915_gem_userptr_notifier
;
203 mn
->objects
= RB_ROOT
;
204 mn
->wq
= alloc_workqueue("i915-userptr-release", WQ_UNBOUND
, 0);
205 if (mn
->wq
== NULL
) {
207 return ERR_PTR(-ENOMEM
);
210 /* Protected by mmap_sem (write-lock) */
211 ret
= __mmu_notifier_register(&mn
->mn
, mm
);
213 destroy_workqueue(mn
->wq
);
222 i915_gem_userptr_release__mmu_notifier(struct drm_i915_gem_object
*obj
)
224 struct i915_mmu_object
*mo
;
226 mo
= obj
->userptr
.mmu_object
;
230 spin_lock(&mo
->mn
->lock
);
232 spin_unlock(&mo
->mn
->lock
);
235 obj
->userptr
.mmu_object
= NULL
;
238 static struct i915_mmu_notifier
*
239 i915_mmu_notifier_find(struct i915_mm_struct
*mm
)
241 struct i915_mmu_notifier
*mn
= mm
->mn
;
247 down_write(&mm
->mm
->mmap_sem
);
248 mutex_lock(&mm
->i915
->mm_lock
);
249 if ((mn
= mm
->mn
) == NULL
) {
250 mn
= i915_mmu_notifier_create(mm
->mm
);
254 mutex_unlock(&mm
->i915
->mm_lock
);
255 up_write(&mm
->mm
->mmap_sem
);
261 i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object
*obj
,
264 struct i915_mmu_notifier
*mn
;
265 struct i915_mmu_object
*mo
;
267 if (flags
& I915_USERPTR_UNSYNCHRONIZED
)
268 return capable(CAP_SYS_ADMIN
) ? 0 : -EPERM
;
270 if (WARN_ON(obj
->userptr
.mm
== NULL
))
273 mn
= i915_mmu_notifier_find(obj
->userptr
.mm
);
277 mo
= kzalloc(sizeof(*mo
), GFP_KERNEL
);
283 mo
->it
.start
= obj
->userptr
.ptr
;
284 mo
->it
.last
= obj
->userptr
.ptr
+ obj
->base
.size
- 1;
285 INIT_WORK(&mo
->work
, cancel_userptr
);
287 obj
->userptr
.mmu_object
= mo
;
292 i915_mmu_notifier_free(struct i915_mmu_notifier
*mn
,
293 struct mm_struct
*mm
)
298 mmu_notifier_unregister(&mn
->mn
, mm
);
299 destroy_workqueue(mn
->wq
);
306 i915_gem_userptr_release__mmu_notifier(struct drm_i915_gem_object
*obj
)
311 i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object
*obj
,
314 if ((flags
& I915_USERPTR_UNSYNCHRONIZED
) == 0)
317 if (!capable(CAP_SYS_ADMIN
))
324 i915_mmu_notifier_free(struct i915_mmu_notifier
*mn
,
325 struct mm_struct
*mm
)
331 static struct i915_mm_struct
*
332 __i915_mm_struct_find(struct drm_i915_private
*dev_priv
, struct mm_struct
*real
)
334 struct i915_mm_struct
*mm
;
336 /* Protected by dev_priv->mm_lock */
337 hash_for_each_possible(dev_priv
->mm_structs
, mm
, node
, (unsigned long)real
)
345 i915_gem_userptr_init__mm_struct(struct drm_i915_gem_object
*obj
)
347 struct drm_i915_private
*dev_priv
= to_i915(obj
->base
.dev
);
348 struct i915_mm_struct
*mm
;
351 /* During release of the GEM object we hold the struct_mutex. This
352 * precludes us from calling mmput() at that time as that may be
353 * the last reference and so call exit_mmap(). exit_mmap() will
354 * attempt to reap the vma, and if we were holding a GTT mmap
355 * would then call drm_gem_vm_close() and attempt to reacquire
356 * the struct mutex. So in order to avoid that recursion, we have
357 * to defer releasing the mm reference until after we drop the
358 * struct_mutex, i.e. we need to schedule a worker to do the clean
361 mutex_lock(&dev_priv
->mm_lock
);
362 mm
= __i915_mm_struct_find(dev_priv
, current
->mm
);
364 mm
= kmalloc(sizeof(*mm
), GFP_KERNEL
);
370 kref_init(&mm
->kref
);
371 mm
->i915
= to_i915(obj
->base
.dev
);
373 mm
->mm
= current
->mm
;
374 atomic_inc(¤t
->mm
->mm_count
);
378 /* Protected by dev_priv->mm_lock */
379 hash_add(dev_priv
->mm_structs
,
380 &mm
->node
, (unsigned long)mm
->mm
);
384 obj
->userptr
.mm
= mm
;
386 mutex_unlock(&dev_priv
->mm_lock
);
391 __i915_mm_struct_free__worker(struct work_struct
*work
)
393 struct i915_mm_struct
*mm
= container_of(work
, typeof(*mm
), work
);
394 i915_mmu_notifier_free(mm
->mn
, mm
->mm
);
400 __i915_mm_struct_free(struct kref
*kref
)
402 struct i915_mm_struct
*mm
= container_of(kref
, typeof(*mm
), kref
);
404 /* Protected by dev_priv->mm_lock */
406 mutex_unlock(&mm
->i915
->mm_lock
);
408 INIT_WORK(&mm
->work
, __i915_mm_struct_free__worker
);
409 schedule_work(&mm
->work
);
413 i915_gem_userptr_release__mm_struct(struct drm_i915_gem_object
*obj
)
415 if (obj
->userptr
.mm
== NULL
)
418 kref_put_mutex(&obj
->userptr
.mm
->kref
,
419 __i915_mm_struct_free
,
420 &to_i915(obj
->base
.dev
)->mm_lock
);
421 obj
->userptr
.mm
= NULL
;
424 struct get_pages_work
{
425 struct work_struct work
;
426 struct drm_i915_gem_object
*obj
;
427 struct task_struct
*task
;
430 #if IS_ENABLED(CONFIG_SWIOTLB)
431 #define swiotlb_active() swiotlb_nr_tbl()
433 #define swiotlb_active() 0
437 st_set_pages(struct sg_table
**st
, struct page
**pvec
, int num_pages
)
439 struct scatterlist
*sg
;
442 *st
= kmalloc(sizeof(**st
), GFP_KERNEL
);
446 if (swiotlb_active()) {
447 ret
= sg_alloc_table(*st
, num_pages
, GFP_KERNEL
);
451 for_each_sg((*st
)->sgl
, sg
, num_pages
, n
)
452 sg_set_page(sg
, pvec
[n
], PAGE_SIZE
, 0);
454 ret
= sg_alloc_table_from_pages(*st
, pvec
, num_pages
,
455 0, num_pages
<< PAGE_SHIFT
,
470 __i915_gem_userptr_set_pages(struct drm_i915_gem_object
*obj
,
471 struct page
**pvec
, int num_pages
)
475 ret
= st_set_pages(&obj
->pages
, pvec
, num_pages
);
479 ret
= i915_gem_gtt_prepare_object(obj
);
481 sg_free_table(obj
->pages
);
490 __i915_gem_userptr_set_active(struct drm_i915_gem_object
*obj
,
495 /* During mm_invalidate_range we need to cancel any userptr that
496 * overlaps the range being invalidated. Doing so requires the
497 * struct_mutex, and that risks recursion. In order to cause
498 * recursion, the user must alias the userptr address space with
499 * a GTT mmapping (possible with a MAP_FIXED) - then when we have
500 * to invalidate that mmaping, mm_invalidate_range is called with
501 * the userptr address *and* the struct_mutex held. To prevent that
502 * we set a flag under the i915_mmu_notifier spinlock to indicate
503 * whether this object is valid.
505 #if defined(CONFIG_MMU_NOTIFIER)
506 if (obj
->userptr
.mmu_object
== NULL
)
509 spin_lock(&obj
->userptr
.mmu_object
->mn
->lock
);
510 /* In order to serialise get_pages with an outstanding
511 * cancel_userptr, we must drop the struct_mutex and try again.
514 del_object(obj
->userptr
.mmu_object
);
515 else if (!work_pending(&obj
->userptr
.mmu_object
->work
))
516 add_object(obj
->userptr
.mmu_object
);
519 spin_unlock(&obj
->userptr
.mmu_object
->mn
->lock
);
526 __i915_gem_userptr_get_pages_worker(struct work_struct
*_work
)
528 struct get_pages_work
*work
= container_of(_work
, typeof(*work
), work
);
529 struct drm_i915_gem_object
*obj
= work
->obj
;
530 struct drm_device
*dev
= obj
->base
.dev
;
531 const int npages
= obj
->base
.size
>> PAGE_SHIFT
;
538 pvec
= drm_malloc_gfp(npages
, sizeof(struct page
*), GFP_TEMPORARY
);
540 struct mm_struct
*mm
= obj
->userptr
.mm
->mm
;
543 if (atomic_inc_not_zero(&mm
->mm_users
)) {
544 down_read(&mm
->mmap_sem
);
545 while (pinned
< npages
) {
546 ret
= get_user_pages_remote
548 obj
->userptr
.ptr
+ pinned
* PAGE_SIZE
,
550 !obj
->userptr
.read_only
, 0,
551 pvec
+ pinned
, NULL
);
557 up_read(&mm
->mmap_sem
);
562 mutex_lock(&dev
->struct_mutex
);
563 if (obj
->userptr
.work
== &work
->work
) {
564 if (pinned
== npages
) {
565 ret
= __i915_gem_userptr_set_pages(obj
, pvec
, npages
);
567 list_add_tail(&obj
->global_list
,
568 &to_i915(dev
)->mm
.unbound_list
);
569 obj
->get_page
.sg
= obj
->pages
->sgl
;
570 obj
->get_page
.last
= 0;
574 obj
->userptr
.work
= ERR_PTR(ret
);
576 __i915_gem_userptr_set_active(obj
, false);
579 obj
->userptr
.workers
--;
580 drm_gem_object_unreference(&obj
->base
);
581 mutex_unlock(&dev
->struct_mutex
);
583 release_pages(pvec
, pinned
, 0);
584 drm_free_large(pvec
);
586 put_task_struct(work
->task
);
591 __i915_gem_userptr_get_pages_schedule(struct drm_i915_gem_object
*obj
,
594 struct get_pages_work
*work
;
596 /* Spawn a worker so that we can acquire the
597 * user pages without holding our mutex. Access
598 * to the user pages requires mmap_sem, and we have
599 * a strict lock ordering of mmap_sem, struct_mutex -
600 * we already hold struct_mutex here and so cannot
601 * call gup without encountering a lock inversion.
603 * Userspace will keep on repeating the operation
604 * (thanks to EAGAIN) until either we hit the fast
605 * path or the worker completes. If the worker is
606 * cancelled or superseded, the task is still run
607 * but the results ignored. (This leads to
608 * complications that we may have a stray object
609 * refcount that we need to be wary of when
610 * checking for existing objects during creation.)
611 * If the worker encounters an error, it reports
612 * that error back to this function through
613 * obj->userptr.work = ERR_PTR.
615 if (obj
->userptr
.workers
>= I915_GEM_USERPTR_MAX_WORKERS
)
618 work
= kmalloc(sizeof(*work
), GFP_KERNEL
);
622 obj
->userptr
.work
= &work
->work
;
623 obj
->userptr
.workers
++;
626 drm_gem_object_reference(&obj
->base
);
628 work
->task
= current
;
629 get_task_struct(work
->task
);
631 INIT_WORK(&work
->work
, __i915_gem_userptr_get_pages_worker
);
632 schedule_work(&work
->work
);
639 i915_gem_userptr_get_pages(struct drm_i915_gem_object
*obj
)
641 const int num_pages
= obj
->base
.size
>> PAGE_SHIFT
;
646 /* If userspace should engineer that these pages are replaced in
647 * the vma between us binding this page into the GTT and completion
648 * of rendering... Their loss. If they change the mapping of their
649 * pages they need to create a new bo to point to the new vma.
651 * However, that still leaves open the possibility of the vma
652 * being copied upon fork. Which falls under the same userspace
653 * synchronisation issue as a regular bo, except that this time
654 * the process may not be expecting that a particular piece of
655 * memory is tied to the GPU.
657 * Fortunately, we can hook into the mmu_notifier in order to
658 * discard the page references prior to anything nasty happening
659 * to the vma (discard or cloning) which should prevent the more
660 * egregious cases from causing harm.
662 if (IS_ERR(obj
->userptr
.work
)) {
663 /* active flag will have been dropped already by the worker */
664 ret
= PTR_ERR(obj
->userptr
.work
);
665 obj
->userptr
.work
= NULL
;
668 if (obj
->userptr
.work
)
669 /* active flag should still be held for the pending work */
672 /* Let the mmu-notifier know that we have begun and need cancellation */
673 ret
= __i915_gem_userptr_set_active(obj
, true);
679 if (obj
->userptr
.mm
->mm
== current
->mm
) {
680 pvec
= drm_malloc_gfp(num_pages
, sizeof(struct page
*),
683 __i915_gem_userptr_set_active(obj
, false);
687 pinned
= __get_user_pages_fast(obj
->userptr
.ptr
, num_pages
,
688 !obj
->userptr
.read_only
, pvec
);
693 ret
= pinned
, pinned
= 0;
694 else if (pinned
< num_pages
)
695 ret
= __i915_gem_userptr_get_pages_schedule(obj
, &active
);
697 ret
= __i915_gem_userptr_set_pages(obj
, pvec
, num_pages
);
699 __i915_gem_userptr_set_active(obj
, active
);
700 release_pages(pvec
, pinned
, 0);
702 drm_free_large(pvec
);
707 i915_gem_userptr_put_pages(struct drm_i915_gem_object
*obj
)
709 struct sg_page_iter sg_iter
;
711 BUG_ON(obj
->userptr
.work
!= NULL
);
712 __i915_gem_userptr_set_active(obj
, false);
714 if (obj
->madv
!= I915_MADV_WILLNEED
)
717 i915_gem_gtt_finish_object(obj
);
719 for_each_sg_page(obj
->pages
->sgl
, &sg_iter
, obj
->pages
->nents
, 0) {
720 struct page
*page
= sg_page_iter_page(&sg_iter
);
723 set_page_dirty(page
);
725 mark_page_accessed(page
);
730 sg_free_table(obj
->pages
);
735 i915_gem_userptr_release(struct drm_i915_gem_object
*obj
)
737 i915_gem_userptr_release__mmu_notifier(obj
);
738 i915_gem_userptr_release__mm_struct(obj
);
742 i915_gem_userptr_dmabuf_export(struct drm_i915_gem_object
*obj
)
744 if (obj
->userptr
.mmu_object
)
747 return i915_gem_userptr_init__mmu_notifier(obj
, 0);
750 static const struct drm_i915_gem_object_ops i915_gem_userptr_ops
= {
751 .flags
= I915_GEM_OBJECT_HAS_STRUCT_PAGE
,
752 .get_pages
= i915_gem_userptr_get_pages
,
753 .put_pages
= i915_gem_userptr_put_pages
,
754 .dmabuf_export
= i915_gem_userptr_dmabuf_export
,
755 .release
= i915_gem_userptr_release
,
759 * Creates a new mm object that wraps some normal memory from the process
760 * context - user memory.
762 * We impose several restrictions upon the memory being mapped
764 * 1. It must be page aligned (both start/end addresses, i.e ptr and size).
765 * 2. It must be normal system memory, not a pointer into another map of IO
766 * space (e.g. it must not be a GTT mmapping of another object).
767 * 3. We only allow a bo as large as we could in theory map into the GTT,
768 * that is we limit the size to the total size of the GTT.
769 * 4. The bo is marked as being snoopable. The backing pages are left
770 * accessible directly by the CPU, but reads and writes by the GPU may
771 * incur the cost of a snoop (unless you have an LLC architecture).
773 * Synchronisation between multiple users and the GPU is left to userspace
774 * through the normal set-domain-ioctl. The kernel will enforce that the
775 * GPU relinquishes the VMA before it is returned back to the system
776 * i.e. upon free(), munmap() or process termination. However, the userspace
777 * malloc() library may not immediately relinquish the VMA after free() and
778 * instead reuse it whilst the GPU is still reading and writing to the VMA.
781 * Also note, that the object created here is not currently a "first class"
782 * object, in that several ioctls are banned. These are the CPU access
783 * ioctls: mmap(), pwrite and pread. In practice, you are expected to use
784 * direct access via your pointer rather than use those ioctls. Another
785 * restriction is that we do not allow userptr surfaces to be pinned to the
786 * hardware and so we reject any attempt to create a framebuffer out of a
789 * If you think this is a good interface to use to pass GPU memory between
790 * drivers, please use dma-buf instead. In fact, wherever possible use
794 i915_gem_userptr_ioctl(struct drm_device
*dev
, void *data
, struct drm_file
*file
)
796 struct drm_i915_gem_userptr
*args
= data
;
797 struct drm_i915_gem_object
*obj
;
801 if (!HAS_LLC(dev
) && !HAS_SNOOP(dev
)) {
802 /* We cannot support coherent userptr objects on hw without
803 * LLC and broken snooping.
808 if (args
->flags
& ~(I915_USERPTR_READ_ONLY
|
809 I915_USERPTR_UNSYNCHRONIZED
))
812 if (offset_in_page(args
->user_ptr
| args
->user_size
))
815 if (!access_ok(args
->flags
& I915_USERPTR_READ_ONLY
? VERIFY_READ
: VERIFY_WRITE
,
816 (char __user
*)(unsigned long)args
->user_ptr
, args
->user_size
))
819 if (args
->flags
& I915_USERPTR_READ_ONLY
) {
820 /* On almost all of the current hw, we cannot tell the GPU that a
821 * page is readonly, so this is just a placeholder in the uAPI.
826 obj
= i915_gem_object_alloc(dev
);
830 drm_gem_private_object_init(dev
, &obj
->base
, args
->user_size
);
831 i915_gem_object_init(obj
, &i915_gem_userptr_ops
);
832 obj
->cache_level
= I915_CACHE_LLC
;
833 obj
->base
.write_domain
= I915_GEM_DOMAIN_CPU
;
834 obj
->base
.read_domains
= I915_GEM_DOMAIN_CPU
;
836 obj
->userptr
.ptr
= args
->user_ptr
;
837 obj
->userptr
.read_only
= !!(args
->flags
& I915_USERPTR_READ_ONLY
);
839 /* And keep a pointer to the current->mm for resolving the user pages
840 * at binding. This means that we need to hook into the mmu_notifier
841 * in order to detect if the mmu is destroyed.
843 ret
= i915_gem_userptr_init__mm_struct(obj
);
845 ret
= i915_gem_userptr_init__mmu_notifier(obj
, args
->flags
);
847 ret
= drm_gem_handle_create(file
, &obj
->base
, &handle
);
849 /* drop reference from allocate - handle holds it now */
850 drm_gem_object_unreference_unlocked(&obj
->base
);
854 args
->handle
= handle
;
859 i915_gem_init_userptr(struct drm_device
*dev
)
861 struct drm_i915_private
*dev_priv
= to_i915(dev
);
862 mutex_init(&dev_priv
->mm_lock
);
863 hash_init(dev_priv
->mm_structs
);