2 * SPDX-License-Identifier: MIT
4 * Copyright © 2014-2016 Intel Corporation
7 #include <linux/anon_inodes.h>
8 #include <linux/mman.h>
9 #include <linux/pfn_t.h>
10 #include <linux/sizes.h>
12 #include "gt/intel_gt.h"
13 #include "gt/intel_gt_requests.h"
16 #include "i915_gem_gtt.h"
17 #include "i915_gem_ioctls.h"
18 #include "i915_gem_object.h"
19 #include "i915_gem_mman.h"
20 #include "i915_trace.h"
21 #include "i915_user_extensions.h"
25 __vma_matches(struct vm_area_struct *vma, struct file *filp,
26 unsigned long addr, unsigned long size)
28 if (vma->vm_file != filp)
31 return vma->vm_start == addr &&
32 (vma->vm_end - vma->vm_start) == PAGE_ALIGN(size);
36 * i915_gem_mmap_ioctl - Maps the contents of an object, returning the address
39 * @data: ioctl data blob
42 * While the mapping holds a reference on the contents of the object, it doesn't
43 * imply a ref on the object itself.
47 * DRM driver writers who look a this function as an example for how to do GEM
48 * mmap support, please don't implement mmap support like here. The modern way
49 * to implement DRM mmap support is with an mmap offset ioctl (like
50 * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
51 * That way debug tooling like valgrind will understand what's going on, hiding
52 * the mmap call in a driver private ioctl will break that. The i915 driver only
53 * does cpu mmaps this way because we didn't know better.
56 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
57 struct drm_file *file)
59 struct drm_i915_gem_mmap *args = data;
60 struct drm_i915_gem_object *obj;
63 if (args->flags & ~(I915_MMAP_WC))
66 if (args->flags & I915_MMAP_WC && !boot_cpu_has(X86_FEATURE_PAT))
69 obj = i915_gem_object_lookup(file, args->handle);
73 /* prime objects have no backing filp to GEM mmap
76 if (!obj->base.filp) {
81 if (range_overflows(args->offset, args->size, (u64)obj->base.size)) {
86 addr = vm_mmap(obj->base.filp, 0, args->size,
87 PROT_READ | PROT_WRITE, MAP_SHARED,
89 if (IS_ERR_VALUE(addr))
92 if (args->flags & I915_MMAP_WC) {
93 struct mm_struct *mm = current->mm;
94 struct vm_area_struct *vma;
96 if (mmap_write_lock_killable(mm)) {
100 vma = find_vma(mm, addr);
101 if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
103 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
106 mmap_write_unlock(mm);
107 if (IS_ERR_VALUE(addr))
110 i915_gem_object_put(obj);
112 args->addr_ptr = (u64)addr;
116 i915_gem_object_put(obj);
120 static unsigned int tile_row_pages(const struct drm_i915_gem_object *obj)
122 return i915_gem_object_get_tile_row_size(obj) >> PAGE_SHIFT;
126 * i915_gem_mmap_gtt_version - report the current feature set for GTT mmaps
128 * A history of the GTT mmap interface:
130 * 0 - Everything had to fit into the GTT. Both parties of a memcpy had to
131 * aligned and suitable for fencing, and still fit into the available
132 * mappable space left by the pinned display objects. A classic problem
133 * we called the page-fault-of-doom where we would ping-pong between
134 * two objects that could not fit inside the GTT and so the memcpy
135 * would page one object in at the expense of the other between every
138 * 1 - Objects can be any size, and have any compatible fencing (X Y, or none
139 * as set via i915_gem_set_tiling() [DRM_I915_GEM_SET_TILING]). If the
140 * object is too large for the available space (or simply too large
141 * for the mappable aperture!), a view is created instead and faulted
142 * into userspace. (This view is aligned and sized appropriately for
145 * 2 - Recognise WC as a separate cache domain so that we can flush the
146 * delayed writes via GTT before performing direct access via WC.
148 * 3 - Remove implicit set-domain(GTT) and synchronisation on initial
149 * pagefault; swapin remains transparent.
151 * 4 - Support multiple fault handlers per object depending on object's
152 * backing storage (a.k.a. MMAP_OFFSET).
156 * * snoopable objects cannot be accessed via the GTT. It can cause machine
157 * hangs on some architectures, corruption on others. An attempt to service
158 * a GTT page fault from a snoopable object will generate a SIGBUS.
160 * * the object must be able to fit into RAM (physical memory, though no
161 * limited to the mappable aperture).
166 * * a new GTT page fault will synchronize rendering from the GPU and flush
167 * all data to system memory. Subsequent access will not be synchronized.
169 * * all mappings are revoked on runtime device suspend.
171 * * there are only 8, 16 or 32 fence registers to share between all users
172 * (older machines require fence register for display and blitter access
173 * as well). Contention of the fence registers will cause the previous users
174 * to be unmapped and any new access will generate new page faults.
176 * * running out of memory while servicing a fault may generate a SIGBUS,
177 * rather than the expected SIGSEGV.
179 int i915_gem_mmap_gtt_version(void)
184 static inline struct i915_ggtt_view
185 compute_partial_view(const struct drm_i915_gem_object *obj,
189 struct i915_ggtt_view view;
191 if (i915_gem_object_is_tiled(obj))
192 chunk = roundup(chunk, tile_row_pages(obj));
194 view.type = I915_GGTT_VIEW_PARTIAL;
195 view.partial.offset = rounddown(page_offset, chunk);
197 min_t(unsigned int, chunk,
198 (obj->base.size >> PAGE_SHIFT) - view.partial.offset);
200 /* If the partial covers the entire object, just create a normal VMA. */
201 if (chunk >= obj->base.size >> PAGE_SHIFT)
202 view.type = I915_GGTT_VIEW_NORMAL;
207 static vm_fault_t i915_error_to_vmf_fault(int err)
211 WARN_ONCE(err, "unhandled error in %s: %i\n", __func__, err);
213 case -EIO: /* shmemfs failure from swap device */
214 case -EFAULT: /* purged object */
215 case -ENODEV: /* bad object, how did you get here! */
216 case -ENXIO: /* unable to access backing store (on device) */
217 return VM_FAULT_SIGBUS;
219 case -ENOMEM: /* our allocation failure */
224 case -ENOSPC: /* transient failure to evict? */
229 * EBUSY is ok: this just means that another thread
230 * already did the job.
232 return VM_FAULT_NOPAGE;
236 static vm_fault_t vm_fault_cpu(struct vm_fault *vmf)
238 struct vm_area_struct *area = vmf->vma;
239 struct i915_mmap_offset *mmo = area->vm_private_data;
240 struct drm_i915_gem_object *obj = mmo->obj;
241 resource_size_t iomap;
244 /* Sanity check that we allow writing into this object */
245 if (unlikely(i915_gem_object_is_readonly(obj) &&
246 area->vm_flags & VM_WRITE))
247 return VM_FAULT_SIGBUS;
249 err = i915_gem_object_pin_pages(obj);
254 if (!i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_STRUCT_PAGE)) {
255 iomap = obj->mm.region->iomap.base;
256 iomap -= obj->mm.region->region.start;
259 /* PTEs are revoked in obj->ops->put_pages() */
260 err = remap_io_sg(area,
261 area->vm_start, area->vm_end - area->vm_start,
262 obj->mm.pages->sgl, iomap);
264 if (area->vm_flags & VM_WRITE) {
265 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
266 obj->mm.dirty = true;
269 i915_gem_object_unpin_pages(obj);
272 return i915_error_to_vmf_fault(err);
275 static vm_fault_t vm_fault_gtt(struct vm_fault *vmf)
277 #define MIN_CHUNK_PAGES (SZ_1M >> PAGE_SHIFT)
278 struct vm_area_struct *area = vmf->vma;
279 struct i915_mmap_offset *mmo = area->vm_private_data;
280 struct drm_i915_gem_object *obj = mmo->obj;
281 struct drm_device *dev = obj->base.dev;
282 struct drm_i915_private *i915 = to_i915(dev);
283 struct intel_runtime_pm *rpm = &i915->runtime_pm;
284 struct i915_ggtt *ggtt = &i915->ggtt;
285 bool write = area->vm_flags & VM_WRITE;
286 intel_wakeref_t wakeref;
287 struct i915_vma *vma;
292 /* Sanity check that we allow writing into this object */
293 if (i915_gem_object_is_readonly(obj) && write)
294 return VM_FAULT_SIGBUS;
296 /* We don't use vmf->pgoff since that has the fake offset */
297 page_offset = (vmf->address - area->vm_start) >> PAGE_SHIFT;
299 trace_i915_gem_object_fault(obj, page_offset, true, write);
301 ret = i915_gem_object_pin_pages(obj);
305 wakeref = intel_runtime_pm_get(rpm);
307 ret = intel_gt_reset_trylock(ggtt->vm.gt, &srcu);
311 /* Now pin it into the GTT as needed */
312 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
314 PIN_NONBLOCK /* NOWARN */ |
317 /* Use a partial view if it is bigger than available space */
318 struct i915_ggtt_view view =
319 compute_partial_view(obj, page_offset, MIN_CHUNK_PAGES);
322 flags = PIN_MAPPABLE | PIN_NOSEARCH;
323 if (view.type == I915_GGTT_VIEW_NORMAL)
324 flags |= PIN_NONBLOCK; /* avoid warnings for pinned */
327 * Userspace is now writing through an untracked VMA, abandon
328 * all hope that the hardware is able to track future writes.
331 vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
333 flags = PIN_MAPPABLE;
334 view.type = I915_GGTT_VIEW_PARTIAL;
335 vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
338 /* The entire mappable GGTT is pinned? Unexpected! */
339 GEM_BUG_ON(vma == ERR_PTR(-ENOSPC));
346 /* Access to snoopable pages through the GTT is incoherent. */
347 if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(i915)) {
352 ret = i915_vma_pin_fence(vma);
356 /* Finally, remap it using the new GTT offset */
357 ret = remap_io_mapping(area,
358 area->vm_start + (vma->ggtt_view.partial.offset << PAGE_SHIFT),
359 (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
360 min_t(u64, vma->size, area->vm_end - area->vm_start),
365 assert_rpm_wakelock_held(rpm);
367 /* Mark as being mmapped into userspace for later revocation */
368 mutex_lock(&i915->ggtt.vm.mutex);
369 if (!i915_vma_set_userfault(vma) && !obj->userfault_count++)
370 list_add(&obj->userfault_link, &i915->ggtt.userfault_list);
371 mutex_unlock(&i915->ggtt.vm.mutex);
373 /* Track the mmo associated with the fenced vma */
376 if (IS_ACTIVE(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND))
377 intel_wakeref_auto(&i915->ggtt.userfault_wakeref,
378 msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));
381 GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
382 i915_vma_set_ggtt_write(vma);
383 obj->mm.dirty = true;
387 i915_vma_unpin_fence(vma);
389 __i915_vma_unpin(vma);
391 intel_gt_reset_unlock(ggtt->vm.gt, srcu);
393 intel_runtime_pm_put(rpm, wakeref);
394 i915_gem_object_unpin_pages(obj);
396 return i915_error_to_vmf_fault(ret);
400 vm_access(struct vm_area_struct *area, unsigned long addr,
401 void *buf, int len, int write)
403 struct i915_mmap_offset *mmo = area->vm_private_data;
404 struct drm_i915_gem_object *obj = mmo->obj;
407 if (i915_gem_object_is_readonly(obj) && write)
410 addr -= area->vm_start;
411 if (addr >= obj->base.size)
414 /* As this is primarily for debugging, let's focus on simplicity */
415 vaddr = i915_gem_object_pin_map(obj, I915_MAP_FORCE_WC);
417 return PTR_ERR(vaddr);
420 memcpy(vaddr + addr, buf, len);
421 __i915_gem_object_flush_map(obj, addr, len);
423 memcpy(buf, vaddr + addr, len);
426 i915_gem_object_unpin_map(obj);
431 void __i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj)
433 struct i915_vma *vma;
435 GEM_BUG_ON(!obj->userfault_count);
437 for_each_ggtt_vma(vma, obj)
438 i915_vma_revoke_mmap(vma);
440 GEM_BUG_ON(obj->userfault_count);
444 * It is vital that we remove the page mapping if we have mapped a tiled
445 * object through the GTT and then lose the fence register due to
446 * resource pressure. Similarly if the object has been moved out of the
447 * aperture, than pages mapped into userspace must be revoked. Removing the
448 * mapping will then trigger a page fault on the next user access, allowing
449 * fixup by vm_fault_gtt().
451 static void i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj)
453 struct drm_i915_private *i915 = to_i915(obj->base.dev);
454 intel_wakeref_t wakeref;
457 * Serialisation between user GTT access and our code depends upon
458 * revoking the CPU's PTE whilst the mutex is held. The next user
459 * pagefault then has to wait until we release the mutex.
461 * Note that RPM complicates somewhat by adding an additional
462 * requirement that operations to the GGTT be made holding the RPM
465 wakeref = intel_runtime_pm_get(&i915->runtime_pm);
466 mutex_lock(&i915->ggtt.vm.mutex);
468 if (!obj->userfault_count)
471 __i915_gem_object_release_mmap_gtt(obj);
474 * Ensure that the CPU's PTE are revoked and there are not outstanding
475 * memory transactions from userspace before we return. The TLB
476 * flushing implied above by changing the PTE above *should* be
477 * sufficient, an extra barrier here just provides us with a bit
478 * of paranoid documentation about our requirement to serialise
479 * memory writes before touching registers / GSM.
484 mutex_unlock(&i915->ggtt.vm.mutex);
485 intel_runtime_pm_put(&i915->runtime_pm, wakeref);
488 void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj)
490 struct i915_mmap_offset *mmo, *mn;
492 spin_lock(&obj->mmo.lock);
493 rbtree_postorder_for_each_entry_safe(mmo, mn,
494 &obj->mmo.offsets, offset) {
496 * vma_node_unmap for GTT mmaps handled already in
497 * __i915_gem_object_release_mmap_gtt
499 if (mmo->mmap_type == I915_MMAP_TYPE_GTT)
502 spin_unlock(&obj->mmo.lock);
503 drm_vma_node_unmap(&mmo->vma_node,
504 obj->base.dev->anon_inode->i_mapping);
505 spin_lock(&obj->mmo.lock);
507 spin_unlock(&obj->mmo.lock);
511 * i915_gem_object_release_mmap - remove physical page mappings
512 * @obj: obj in question
514 * Preserve the reservation of the mmapping with the DRM core code, but
515 * relinquish ownership of the pages back to the system.
517 void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
519 i915_gem_object_release_mmap_gtt(obj);
520 i915_gem_object_release_mmap_offset(obj);
523 static struct i915_mmap_offset *
524 lookup_mmo(struct drm_i915_gem_object *obj,
525 enum i915_mmap_type mmap_type)
529 spin_lock(&obj->mmo.lock);
530 rb = obj->mmo.offsets.rb_node;
532 struct i915_mmap_offset *mmo =
533 rb_entry(rb, typeof(*mmo), offset);
535 if (mmo->mmap_type == mmap_type) {
536 spin_unlock(&obj->mmo.lock);
540 if (mmo->mmap_type < mmap_type)
545 spin_unlock(&obj->mmo.lock);
550 static struct i915_mmap_offset *
551 insert_mmo(struct drm_i915_gem_object *obj, struct i915_mmap_offset *mmo)
553 struct rb_node *rb, **p;
555 spin_lock(&obj->mmo.lock);
557 p = &obj->mmo.offsets.rb_node;
559 struct i915_mmap_offset *pos;
562 pos = rb_entry(rb, typeof(*pos), offset);
564 if (pos->mmap_type == mmo->mmap_type) {
565 spin_unlock(&obj->mmo.lock);
566 drm_vma_offset_remove(obj->base.dev->vma_offset_manager,
572 if (pos->mmap_type < mmo->mmap_type)
577 rb_link_node(&mmo->offset, rb, p);
578 rb_insert_color(&mmo->offset, &obj->mmo.offsets);
579 spin_unlock(&obj->mmo.lock);
584 static struct i915_mmap_offset *
585 mmap_offset_attach(struct drm_i915_gem_object *obj,
586 enum i915_mmap_type mmap_type,
587 struct drm_file *file)
589 struct drm_i915_private *i915 = to_i915(obj->base.dev);
590 struct i915_mmap_offset *mmo;
593 mmo = lookup_mmo(obj, mmap_type);
597 mmo = kmalloc(sizeof(*mmo), GFP_KERNEL);
599 return ERR_PTR(-ENOMEM);
602 mmo->mmap_type = mmap_type;
603 drm_vma_node_reset(&mmo->vma_node);
605 err = drm_vma_offset_add(obj->base.dev->vma_offset_manager,
606 &mmo->vma_node, obj->base.size / PAGE_SIZE);
610 /* Attempt to reap some mmap space from dead objects */
611 err = intel_gt_retire_requests_timeout(&i915->gt, MAX_SCHEDULE_TIMEOUT);
615 i915_gem_drain_freed_objects(i915);
616 err = drm_vma_offset_add(obj->base.dev->vma_offset_manager,
617 &mmo->vma_node, obj->base.size / PAGE_SIZE);
622 mmo = insert_mmo(obj, mmo);
623 GEM_BUG_ON(lookup_mmo(obj, mmap_type) != mmo);
626 drm_vma_node_allow(&mmo->vma_node, file);
635 __assign_mmap_offset(struct drm_file *file,
637 enum i915_mmap_type mmap_type,
640 struct drm_i915_gem_object *obj;
641 struct i915_mmap_offset *mmo;
644 obj = i915_gem_object_lookup(file, handle);
648 if (i915_gem_object_never_mmap(obj)) {
653 if (mmap_type != I915_MMAP_TYPE_GTT &&
654 !i915_gem_object_type_has(obj,
655 I915_GEM_OBJECT_HAS_STRUCT_PAGE |
656 I915_GEM_OBJECT_HAS_IOMEM)) {
661 mmo = mmap_offset_attach(obj, mmap_type, file);
667 *offset = drm_vma_node_offset_addr(&mmo->vma_node);
670 i915_gem_object_put(obj);
675 i915_gem_dumb_mmap_offset(struct drm_file *file,
676 struct drm_device *dev,
680 enum i915_mmap_type mmap_type;
682 if (boot_cpu_has(X86_FEATURE_PAT))
683 mmap_type = I915_MMAP_TYPE_WC;
684 else if (!i915_ggtt_has_aperture(&to_i915(dev)->ggtt))
687 mmap_type = I915_MMAP_TYPE_GTT;
689 return __assign_mmap_offset(file, handle, mmap_type, offset);
693 * i915_gem_mmap_offset_ioctl - prepare an object for GTT mmap'ing
695 * @data: GTT mapping ioctl data
696 * @file: GEM object info
698 * Simply returns the fake offset to userspace so it can mmap it.
699 * The mmap call will end up in drm_gem_mmap(), which will set things
700 * up so we can get faults in the handler above.
702 * The fault handler will take care of binding the object into the GTT
703 * (since it may have been evicted to make room for something), allocating
704 * a fence register, and mapping the appropriate aperture address into
708 i915_gem_mmap_offset_ioctl(struct drm_device *dev, void *data,
709 struct drm_file *file)
711 struct drm_i915_private *i915 = to_i915(dev);
712 struct drm_i915_gem_mmap_offset *args = data;
713 enum i915_mmap_type type;
717 * Historically we failed to check args.pad and args.offset
718 * and so we cannot use those fields for user input and we cannot
719 * add -EINVAL for them as the ABI is fixed, i.e. old userspace
720 * may be feeding in garbage in those fields.
722 * if (args->pad) return -EINVAL; is verbotten!
725 err = i915_user_extensions(u64_to_user_ptr(args->extensions),
730 switch (args->flags) {
731 case I915_MMAP_OFFSET_GTT:
732 if (!i915_ggtt_has_aperture(&i915->ggtt))
734 type = I915_MMAP_TYPE_GTT;
737 case I915_MMAP_OFFSET_WC:
738 if (!boot_cpu_has(X86_FEATURE_PAT))
740 type = I915_MMAP_TYPE_WC;
743 case I915_MMAP_OFFSET_WB:
744 type = I915_MMAP_TYPE_WB;
747 case I915_MMAP_OFFSET_UC:
748 if (!boot_cpu_has(X86_FEATURE_PAT))
750 type = I915_MMAP_TYPE_UC;
757 return __assign_mmap_offset(file, args->handle, type, &args->offset);
760 static void vm_open(struct vm_area_struct *vma)
762 struct i915_mmap_offset *mmo = vma->vm_private_data;
763 struct drm_i915_gem_object *obj = mmo->obj;
766 i915_gem_object_get(obj);
769 static void vm_close(struct vm_area_struct *vma)
771 struct i915_mmap_offset *mmo = vma->vm_private_data;
772 struct drm_i915_gem_object *obj = mmo->obj;
775 i915_gem_object_put(obj);
778 static const struct vm_operations_struct vm_ops_gtt = {
779 .fault = vm_fault_gtt,
785 static const struct vm_operations_struct vm_ops_cpu = {
786 .fault = vm_fault_cpu,
792 static int singleton_release(struct inode *inode, struct file *file)
794 struct drm_i915_private *i915 = file->private_data;
796 cmpxchg(&i915->gem.mmap_singleton, file, NULL);
797 drm_dev_put(&i915->drm);
802 static const struct file_operations singleton_fops = {
803 .owner = THIS_MODULE,
804 .release = singleton_release,
807 static struct file *mmap_singleton(struct drm_i915_private *i915)
812 file = READ_ONCE(i915->gem.mmap_singleton);
813 if (file && !get_file_rcu(file))
819 file = anon_inode_getfile("i915.gem", &singleton_fops, i915, O_RDWR);
823 /* Everyone shares a single global address space */
824 file->f_mapping = i915->drm.anon_inode->i_mapping;
826 smp_store_mb(i915->gem.mmap_singleton, file);
827 drm_dev_get(&i915->drm);
833 * This overcomes the limitation in drm_gem_mmap's assignment of a
834 * drm_gem_object as the vma->vm_private_data. Since we need to
835 * be able to resolve multiple mmap offsets which could be tied
836 * to a single gem object.
838 int i915_gem_mmap(struct file *filp, struct vm_area_struct *vma)
840 struct drm_vma_offset_node *node;
841 struct drm_file *priv = filp->private_data;
842 struct drm_device *dev = priv->minor->dev;
843 struct drm_i915_gem_object *obj = NULL;
844 struct i915_mmap_offset *mmo = NULL;
847 if (drm_dev_is_unplugged(dev))
851 drm_vma_offset_lock_lookup(dev->vma_offset_manager);
852 node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
855 if (node && drm_vma_node_is_allowed(node, priv)) {
857 * Skip 0-refcnted objects as it is in the process of being
858 * destroyed and will be invalid when the vma manager lock
861 mmo = container_of(node, struct i915_mmap_offset, vma_node);
862 obj = i915_gem_object_get_rcu(mmo->obj);
864 drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
867 return node ? -EACCES : -EINVAL;
869 if (i915_gem_object_is_readonly(obj)) {
870 if (vma->vm_flags & VM_WRITE) {
871 i915_gem_object_put(obj);
874 vma->vm_flags &= ~VM_MAYWRITE;
877 anon = mmap_singleton(to_i915(dev));
879 i915_gem_object_put(obj);
880 return PTR_ERR(anon);
883 vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
884 vma->vm_private_data = mmo;
887 * We keep the ref on mmo->obj, not vm_file, but we require
888 * vma->vm_file->f_mapping, see vma_link(), for later revocation.
889 * Our userspace is accustomed to having per-file resource cleanup
890 * (i.e. contexts, objects and requests) on their close(fd), which
891 * requires avoiding extraneous references to their filp, hence why
892 * we prefer to use an anonymous file for their mmaps.
897 switch (mmo->mmap_type) {
898 case I915_MMAP_TYPE_WC:
900 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
901 vma->vm_ops = &vm_ops_cpu;
904 case I915_MMAP_TYPE_WB:
905 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
906 vma->vm_ops = &vm_ops_cpu;
909 case I915_MMAP_TYPE_UC:
911 pgprot_noncached(vm_get_page_prot(vma->vm_flags));
912 vma->vm_ops = &vm_ops_cpu;
915 case I915_MMAP_TYPE_GTT:
917 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
918 vma->vm_ops = &vm_ops_gtt;
921 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
926 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
927 #include "selftests/i915_gem_mman.c"