2 * VFIO: IOMMU DMA mapping support for Type1 IOMMU
4 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
5 * Author: Alex Williamson <alex.williamson@redhat.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Derived from original vfio:
12 * Copyright 2010 Cisco Systems, Inc. All rights reserved.
13 * Author: Tom Lyon, pugs@cisco.com
15 * We arbitrarily define a Type1 IOMMU as one matching the below code.
16 * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel
17 * VT-d, but that makes it harder to re-use as theoretically anyone
18 * implementing a similar IOMMU could make use of this. We expect the
19 * IOMMU to support the IOMMU API and have few to no restrictions around
20 * the IOVA range that can be mapped. The Type1 IOMMU is currently
21 * optimized for relatively static mappings of a userspace process with
22 * userpsace pages pinned into memory. We also assume devices and IOMMU
23 * domains are PCI based as the IOMMU API is still centered around a
24 * device/bus interface rather than a group interface.
27 #include <linux/compat.h>
28 #include <linux/device.h>
30 #include <linux/iommu.h>
31 #include <linux/module.h>
33 #include <linux/rbtree.h>
34 #include <linux/sched.h>
35 #include <linux/slab.h>
36 #include <linux/uaccess.h>
37 #include <linux/vfio.h>
38 #include <linux/workqueue.h>
40 #define DRIVER_VERSION "0.2"
41 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
42 #define DRIVER_DESC "Type1 IOMMU driver for VFIO"
44 static bool allow_unsafe_interrupts;
45 module_param_named(allow_unsafe_interrupts,
46 allow_unsafe_interrupts, bool, S_IRUGO | S_IWUSR);
47 MODULE_PARM_DESC(allow_unsafe_interrupts,
48 "Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
50 static bool disable_hugepages;
51 module_param_named(disable_hugepages,
52 disable_hugepages, bool, S_IRUGO | S_IWUSR);
53 MODULE_PARM_DESC(disable_hugepages,
54 "Disable VFIO IOMMU support for IOMMU hugepages.");
57 struct list_head domain_list;
59 struct rb_root dma_list;
65 struct iommu_domain *domain;
66 struct list_head next;
67 struct list_head group_list;
68 int prot; /* IOMMU_CACHE */
73 dma_addr_t iova; /* Device address */
74 unsigned long vaddr; /* Process virtual addr */
75 size_t size; /* Map size (bytes) */
76 int prot; /* IOMMU_READ/WRITE */
80 struct iommu_group *iommu_group;
81 struct list_head next;
85 * This code handles mapping and unmapping of user data buffers
86 * into DMA'ble space using the IOMMU
89 static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
90 dma_addr_t start, size_t size)
92 struct rb_node *node = iommu->dma_list.rb_node;
95 struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node);
97 if (start + size <= dma->iova)
99 else if (start >= dma->iova + dma->size)
100 node = node->rb_right;
108 static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new)
110 struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL;
111 struct vfio_dma *dma;
115 dma = rb_entry(parent, struct vfio_dma, node);
117 if (new->iova + new->size <= dma->iova)
118 link = &(*link)->rb_left;
120 link = &(*link)->rb_right;
123 rb_link_node(&new->node, parent, link);
124 rb_insert_color(&new->node, &iommu->dma_list);
127 static void vfio_unlink_dma(struct vfio_iommu *iommu, struct vfio_dma *old)
129 rb_erase(&old->node, &iommu->dma_list);
133 struct mm_struct *mm;
135 struct work_struct work;
138 /* delayed decrement/increment for locked_vm */
139 static void vfio_lock_acct_bg(struct work_struct *work)
141 struct vwork *vwork = container_of(work, struct vwork, work);
142 struct mm_struct *mm;
145 down_write(&mm->mmap_sem);
146 mm->locked_vm += vwork->npage;
147 up_write(&mm->mmap_sem);
152 static void vfio_lock_acct(long npage)
155 struct mm_struct *mm;
157 if (!current->mm || !npage)
158 return; /* process exited or nothing to do */
160 if (down_write_trylock(¤t->mm->mmap_sem)) {
161 current->mm->locked_vm += npage;
162 up_write(¤t->mm->mmap_sem);
167 * Couldn't get mmap_sem lock, so must setup to update
168 * mm->locked_vm later. If locked_vm were atomic, we
169 * wouldn't need this silliness
171 vwork = kmalloc(sizeof(struct vwork), GFP_KERNEL);
174 mm = get_task_mm(current);
179 INIT_WORK(&vwork->work, vfio_lock_acct_bg);
181 vwork->npage = npage;
182 schedule_work(&vwork->work);
186 * Some mappings aren't backed by a struct page, for example an mmap'd
187 * MMIO range for our own or another device. These use a different
188 * pfn conversion and shouldn't be tracked as locked pages.
190 static bool is_invalid_reserved_pfn(unsigned long pfn)
192 if (pfn_valid(pfn)) {
194 struct page *tail = pfn_to_page(pfn);
195 struct page *head = compound_head(tail);
196 reserved = !!(PageReserved(head));
199 * "head" is not a dangling pointer
200 * (compound_head takes care of that)
201 * but the hugepage may have been split
202 * from under us (and we may not hold a
203 * reference count on the head page so it can
204 * be reused before we run PageReferenced), so
205 * we've to check PageTail before returning
212 return PageReserved(tail);
218 static int put_pfn(unsigned long pfn, int prot)
220 if (!is_invalid_reserved_pfn(pfn)) {
221 struct page *page = pfn_to_page(pfn);
222 if (prot & IOMMU_WRITE)
230 static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn)
232 struct page *page[1];
233 struct vm_area_struct *vma;
236 if (get_user_pages_fast(vaddr, 1, !!(prot & IOMMU_WRITE), page) == 1) {
237 *pfn = page_to_pfn(page[0]);
241 down_read(¤t->mm->mmap_sem);
243 vma = find_vma_intersection(current->mm, vaddr, vaddr + 1);
245 if (vma && vma->vm_flags & VM_PFNMAP) {
246 *pfn = ((vaddr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
247 if (is_invalid_reserved_pfn(*pfn))
251 up_read(¤t->mm->mmap_sem);
257 * Attempt to pin pages. We really don't want to track all the pfns and
258 * the iommu can only map chunks of consecutive pfns anyway, so get the
259 * first page and all consecutive pages with the same locking.
261 static long vfio_pin_pages(unsigned long vaddr, long npage,
262 int prot, unsigned long *pfn_base)
264 unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
265 bool lock_cap = capable(CAP_IPC_LOCK);
271 ret = vaddr_get_pfn(vaddr, prot, pfn_base);
275 if (is_invalid_reserved_pfn(*pfn_base))
278 if (!lock_cap && current->mm->locked_vm + 1 > limit) {
279 put_pfn(*pfn_base, prot);
280 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__,
281 limit << PAGE_SHIFT);
285 if (unlikely(disable_hugepages)) {
290 /* Lock all the consecutive pages from pfn_base */
291 for (i = 1, vaddr += PAGE_SIZE; i < npage; i++, vaddr += PAGE_SIZE) {
292 unsigned long pfn = 0;
294 ret = vaddr_get_pfn(vaddr, prot, &pfn);
298 if (pfn != *pfn_base + i || is_invalid_reserved_pfn(pfn)) {
303 if (!lock_cap && current->mm->locked_vm + i + 1 > limit) {
305 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
306 __func__, limit << PAGE_SHIFT);
316 static long vfio_unpin_pages(unsigned long pfn, long npage,
317 int prot, bool do_accounting)
319 unsigned long unlocked = 0;
322 for (i = 0; i < npage; i++)
323 unlocked += put_pfn(pfn++, prot);
326 vfio_lock_acct(-unlocked);
331 static void vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma)
333 dma_addr_t iova = dma->iova, end = dma->iova + dma->size;
334 struct vfio_domain *domain, *d;
340 * We use the IOMMU to track the physical addresses, otherwise we'd
341 * need a much more complicated tracking system. Unfortunately that
342 * means we need to use one of the iommu domains to figure out the
343 * pfns to unpin. The rest need to be unmapped in advance so we have
344 * no iommu translations remaining when the pages are unpinned.
346 domain = d = list_first_entry(&iommu->domain_list,
347 struct vfio_domain, next);
349 list_for_each_entry_continue(d, &iommu->domain_list, next)
350 iommu_unmap(d->domain, dma->iova, dma->size);
356 phys = iommu_iova_to_phys(domain->domain, iova);
357 if (WARN_ON(!phys)) {
362 unmapped = iommu_unmap(domain->domain, iova, PAGE_SIZE);
363 if (WARN_ON(!unmapped))
366 unlocked += vfio_unpin_pages(phys >> PAGE_SHIFT,
367 unmapped >> PAGE_SHIFT,
372 vfio_lock_acct(-unlocked);
375 static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma)
377 vfio_unmap_unpin(iommu, dma);
378 vfio_unlink_dma(iommu, dma);
382 static unsigned long vfio_pgsize_bitmap(struct vfio_iommu *iommu)
384 struct vfio_domain *domain;
385 unsigned long bitmap = PAGE_MASK;
387 mutex_lock(&iommu->lock);
388 list_for_each_entry(domain, &iommu->domain_list, next)
389 bitmap &= domain->domain->ops->pgsize_bitmap;
390 mutex_unlock(&iommu->lock);
395 static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
396 struct vfio_iommu_type1_dma_unmap *unmap)
399 struct vfio_dma *dma;
403 mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
405 if (unmap->iova & mask)
407 if (!unmap->size || unmap->size & mask)
410 WARN_ON(mask & PAGE_MASK);
412 mutex_lock(&iommu->lock);
415 * vfio-iommu-type1 (v1) - User mappings were coalesced together to
416 * avoid tracking individual mappings. This means that the granularity
417 * of the original mapping was lost and the user was allowed to attempt
418 * to unmap any range. Depending on the contiguousness of physical
419 * memory and page sizes supported by the IOMMU, arbitrary unmaps may
420 * or may not have worked. We only guaranteed unmap granularity
421 * matching the original mapping; even though it was untracked here,
422 * the original mappings are reflected in IOMMU mappings. This
423 * resulted in a couple unusual behaviors. First, if a range is not
424 * able to be unmapped, ex. a set of 4k pages that was mapped as a
425 * 2M hugepage into the IOMMU, the unmap ioctl returns success but with
426 * a zero sized unmap. Also, if an unmap request overlaps the first
427 * address of a hugepage, the IOMMU will unmap the entire hugepage.
428 * This also returns success and the returned unmap size reflects the
429 * actual size unmapped.
431 * We attempt to maintain compatibility with this "v1" interface, but
432 * we take control out of the hands of the IOMMU. Therefore, an unmap
433 * request offset from the beginning of the original mapping will
434 * return success with zero sized unmap. And an unmap request covering
435 * the first iova of mapping will unmap the entire range.
437 * The v2 version of this interface intends to be more deterministic.
438 * Unmap requests must fully cover previous mappings. Multiple
439 * mappings may still be unmaped by specifying large ranges, but there
440 * must not be any previous mappings bisected by the range. An error
441 * will be returned if these conditions are not met. The v2 interface
442 * will only return success and a size of zero if there were no
443 * mappings within the range.
446 dma = vfio_find_dma(iommu, unmap->iova, 0);
447 if (dma && dma->iova != unmap->iova) {
451 dma = vfio_find_dma(iommu, unmap->iova + unmap->size - 1, 0);
452 if (dma && dma->iova + dma->size != unmap->iova + unmap->size) {
458 while ((dma = vfio_find_dma(iommu, unmap->iova, unmap->size))) {
459 if (!iommu->v2 && unmap->iova > dma->iova)
461 unmapped += dma->size;
462 vfio_remove_dma(iommu, dma);
466 mutex_unlock(&iommu->lock);
468 /* Report how much was unmapped */
469 unmap->size = unmapped;
475 * Turns out AMD IOMMU has a page table bug where it won't map large pages
476 * to a region that previously mapped smaller pages. This should be fixed
477 * soon, so this is just a temporary workaround to break mappings down into
478 * PAGE_SIZE. Better to map smaller pages than nothing.
480 static int map_try_harder(struct vfio_domain *domain, dma_addr_t iova,
481 unsigned long pfn, long npage, int prot)
486 for (i = 0; i < npage; i++, pfn++, iova += PAGE_SIZE) {
487 ret = iommu_map(domain->domain, iova,
488 (phys_addr_t)pfn << PAGE_SHIFT,
489 PAGE_SIZE, prot | domain->prot);
494 for (; i < npage && i > 0; i--, iova -= PAGE_SIZE)
495 iommu_unmap(domain->domain, iova, PAGE_SIZE);
500 static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova,
501 unsigned long pfn, long npage, int prot)
503 struct vfio_domain *d;
506 list_for_each_entry(d, &iommu->domain_list, next) {
507 ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
508 npage << PAGE_SHIFT, prot | d->prot);
511 map_try_harder(d, iova, pfn, npage, prot))
519 list_for_each_entry_continue_reverse(d, &iommu->domain_list, next)
520 iommu_unmap(d->domain, iova, npage << PAGE_SHIFT);
525 static int vfio_dma_do_map(struct vfio_iommu *iommu,
526 struct vfio_iommu_type1_dma_map *map)
528 dma_addr_t iova = map->iova;
529 unsigned long vaddr = map->vaddr;
530 size_t size = map->size;
532 int ret = 0, prot = 0;
534 struct vfio_dma *dma;
537 /* Verify that none of our __u64 fields overflow */
538 if (map->size != size || map->vaddr != vaddr || map->iova != iova)
541 mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
543 WARN_ON(mask & PAGE_MASK);
545 /* READ/WRITE from device perspective */
546 if (map->flags & VFIO_DMA_MAP_FLAG_WRITE)
548 if (map->flags & VFIO_DMA_MAP_FLAG_READ)
551 if (!prot || !size || (size | iova | vaddr) & mask)
554 /* Don't allow IOVA or virtual address wrap */
555 if (iova + size - 1 < iova || vaddr + size - 1 < vaddr)
558 mutex_lock(&iommu->lock);
560 if (vfio_find_dma(iommu, iova, size)) {
561 mutex_unlock(&iommu->lock);
565 dma = kzalloc(sizeof(*dma), GFP_KERNEL);
567 mutex_unlock(&iommu->lock);
575 /* Insert zero-sized and grow as we map chunks of it */
576 vfio_link_dma(iommu, dma);
579 /* Pin a contiguous chunk of memory */
580 npage = vfio_pin_pages(vaddr + dma->size,
581 size >> PAGE_SHIFT, prot, &pfn);
589 ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage, prot);
591 vfio_unpin_pages(pfn, npage, prot, true);
595 size -= npage << PAGE_SHIFT;
596 dma->size += npage << PAGE_SHIFT;
600 vfio_remove_dma(iommu, dma);
602 mutex_unlock(&iommu->lock);
606 static int vfio_bus_type(struct device *dev, void *data)
608 struct bus_type **bus = data;
610 if (*bus && *bus != dev->bus)
618 static int vfio_iommu_replay(struct vfio_iommu *iommu,
619 struct vfio_domain *domain)
621 struct vfio_domain *d;
625 /* Arbitrarily pick the first domain in the list for lookups */
626 d = list_first_entry(&iommu->domain_list, struct vfio_domain, next);
627 n = rb_first(&iommu->dma_list);
629 /* If there's not a domain, there better not be any mappings */
630 if (WARN_ON(n && !d))
633 for (; n; n = rb_next(n)) {
634 struct vfio_dma *dma;
637 dma = rb_entry(n, struct vfio_dma, node);
640 while (iova < dma->iova + dma->size) {
641 phys_addr_t phys = iommu_iova_to_phys(d->domain, iova);
644 if (WARN_ON(!phys)) {
651 while (iova + size < dma->iova + dma->size &&
652 phys + size == iommu_iova_to_phys(d->domain,
656 ret = iommu_map(domain->domain, iova, phys,
657 size, dma->prot | domain->prot);
668 static int vfio_iommu_type1_attach_group(void *iommu_data,
669 struct iommu_group *iommu_group)
671 struct vfio_iommu *iommu = iommu_data;
672 struct vfio_group *group, *g;
673 struct vfio_domain *domain, *d;
674 struct bus_type *bus = NULL;
677 mutex_lock(&iommu->lock);
679 list_for_each_entry(d, &iommu->domain_list, next) {
680 list_for_each_entry(g, &d->group_list, next) {
681 if (g->iommu_group != iommu_group)
684 mutex_unlock(&iommu->lock);
689 group = kzalloc(sizeof(*group), GFP_KERNEL);
690 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
691 if (!group || !domain) {
696 group->iommu_group = iommu_group;
698 /* Determine bus_type in order to allocate a domain */
699 ret = iommu_group_for_each_dev(iommu_group, &bus, vfio_bus_type);
703 domain->domain = iommu_domain_alloc(bus);
704 if (!domain->domain) {
709 if (iommu->nesting) {
712 ret = iommu_domain_set_attr(domain->domain, DOMAIN_ATTR_NESTING,
718 ret = iommu_attach_group(domain->domain, iommu_group);
722 INIT_LIST_HEAD(&domain->group_list);
723 list_add(&group->next, &domain->group_list);
725 if (!allow_unsafe_interrupts &&
726 !iommu_capable(bus, IOMMU_CAP_INTR_REMAP)) {
727 pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
733 if (iommu_capable(bus, IOMMU_CAP_CACHE_COHERENCY))
734 domain->prot |= IOMMU_CACHE;
737 * Try to match an existing compatible domain. We don't want to
738 * preclude an IOMMU driver supporting multiple bus_types and being
739 * able to include different bus_types in the same IOMMU domain, so
740 * we test whether the domains use the same iommu_ops rather than
741 * testing if they're on the same bus_type.
743 list_for_each_entry(d, &iommu->domain_list, next) {
744 if (d->domain->ops == domain->domain->ops &&
745 d->prot == domain->prot) {
746 iommu_detach_group(domain->domain, iommu_group);
747 if (!iommu_attach_group(d->domain, iommu_group)) {
748 list_add(&group->next, &d->group_list);
749 iommu_domain_free(domain->domain);
751 mutex_unlock(&iommu->lock);
755 ret = iommu_attach_group(domain->domain, iommu_group);
761 /* replay mappings on new domains */
762 ret = vfio_iommu_replay(iommu, domain);
766 list_add(&domain->next, &iommu->domain_list);
768 mutex_unlock(&iommu->lock);
773 iommu_detach_group(domain->domain, iommu_group);
775 iommu_domain_free(domain->domain);
779 mutex_unlock(&iommu->lock);
783 static void vfio_iommu_unmap_unpin_all(struct vfio_iommu *iommu)
785 struct rb_node *node;
787 while ((node = rb_first(&iommu->dma_list)))
788 vfio_remove_dma(iommu, rb_entry(node, struct vfio_dma, node));
791 static void vfio_iommu_type1_detach_group(void *iommu_data,
792 struct iommu_group *iommu_group)
794 struct vfio_iommu *iommu = iommu_data;
795 struct vfio_domain *domain;
796 struct vfio_group *group;
798 mutex_lock(&iommu->lock);
800 list_for_each_entry(domain, &iommu->domain_list, next) {
801 list_for_each_entry(group, &domain->group_list, next) {
802 if (group->iommu_group != iommu_group)
805 iommu_detach_group(domain->domain, iommu_group);
806 list_del(&group->next);
809 * Group ownership provides privilege, if the group
810 * list is empty, the domain goes away. If it's the
811 * last domain, then all the mappings go away too.
813 if (list_empty(&domain->group_list)) {
814 if (list_is_singular(&iommu->domain_list))
815 vfio_iommu_unmap_unpin_all(iommu);
816 iommu_domain_free(domain->domain);
817 list_del(&domain->next);
825 mutex_unlock(&iommu->lock);
828 static void *vfio_iommu_type1_open(unsigned long arg)
830 struct vfio_iommu *iommu;
832 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
834 return ERR_PTR(-ENOMEM);
837 case VFIO_TYPE1_IOMMU:
839 case VFIO_TYPE1_NESTING_IOMMU:
840 iommu->nesting = true;
841 case VFIO_TYPE1v2_IOMMU:
846 return ERR_PTR(-EINVAL);
849 INIT_LIST_HEAD(&iommu->domain_list);
850 iommu->dma_list = RB_ROOT;
851 mutex_init(&iommu->lock);
856 static void vfio_iommu_type1_release(void *iommu_data)
858 struct vfio_iommu *iommu = iommu_data;
859 struct vfio_domain *domain, *domain_tmp;
860 struct vfio_group *group, *group_tmp;
862 vfio_iommu_unmap_unpin_all(iommu);
864 list_for_each_entry_safe(domain, domain_tmp,
865 &iommu->domain_list, next) {
866 list_for_each_entry_safe(group, group_tmp,
867 &domain->group_list, next) {
868 iommu_detach_group(domain->domain, group->iommu_group);
869 list_del(&group->next);
872 iommu_domain_free(domain->domain);
873 list_del(&domain->next);
880 static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
882 struct vfio_domain *domain;
885 mutex_lock(&iommu->lock);
886 list_for_each_entry(domain, &iommu->domain_list, next) {
887 if (!(domain->prot & IOMMU_CACHE)) {
892 mutex_unlock(&iommu->lock);
897 static long vfio_iommu_type1_ioctl(void *iommu_data,
898 unsigned int cmd, unsigned long arg)
900 struct vfio_iommu *iommu = iommu_data;
903 if (cmd == VFIO_CHECK_EXTENSION) {
905 case VFIO_TYPE1_IOMMU:
906 case VFIO_TYPE1v2_IOMMU:
907 case VFIO_TYPE1_NESTING_IOMMU:
909 case VFIO_DMA_CC_IOMMU:
912 return vfio_domains_have_iommu_cache(iommu);
916 } else if (cmd == VFIO_IOMMU_GET_INFO) {
917 struct vfio_iommu_type1_info info;
919 minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
921 if (copy_from_user(&info, (void __user *)arg, minsz))
924 if (info.argsz < minsz)
929 info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
931 return copy_to_user((void __user *)arg, &info, minsz);
933 } else if (cmd == VFIO_IOMMU_MAP_DMA) {
934 struct vfio_iommu_type1_dma_map map;
935 uint32_t mask = VFIO_DMA_MAP_FLAG_READ |
936 VFIO_DMA_MAP_FLAG_WRITE;
938 minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
940 if (copy_from_user(&map, (void __user *)arg, minsz))
943 if (map.argsz < minsz || map.flags & ~mask)
946 return vfio_dma_do_map(iommu, &map);
948 } else if (cmd == VFIO_IOMMU_UNMAP_DMA) {
949 struct vfio_iommu_type1_dma_unmap unmap;
952 minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
954 if (copy_from_user(&unmap, (void __user *)arg, minsz))
957 if (unmap.argsz < minsz || unmap.flags)
960 ret = vfio_dma_do_unmap(iommu, &unmap);
964 return copy_to_user((void __user *)arg, &unmap, minsz);
970 static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
971 .name = "vfio-iommu-type1",
972 .owner = THIS_MODULE,
973 .open = vfio_iommu_type1_open,
974 .release = vfio_iommu_type1_release,
975 .ioctl = vfio_iommu_type1_ioctl,
976 .attach_group = vfio_iommu_type1_attach_group,
977 .detach_group = vfio_iommu_type1_detach_group,
980 static int __init vfio_iommu_type1_init(void)
982 return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1);
985 static void __exit vfio_iommu_type1_cleanup(void)
987 vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1);
990 module_init(vfio_iommu_type1_init);
991 module_exit(vfio_iommu_type1_cleanup);
993 MODULE_VERSION(DRIVER_VERSION);
994 MODULE_LICENSE("GPL v2");
995 MODULE_AUTHOR(DRIVER_AUTHOR);
996 MODULE_DESCRIPTION(DRIVER_DESC);