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/signal.h>
35 #include <linux/sched/mm.h>
36 #include <linux/slab.h>
37 #include <linux/uaccess.h>
38 #include <linux/vfio.h>
39 #include <linux/workqueue.h>
40 #include <linux/mdev.h>
41 #include <linux/notifier.h>
42 #include <linux/dma-iommu.h>
43 #include <linux/irqdomain.h>
45 #define DRIVER_VERSION "0.2"
46 #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
47 #define DRIVER_DESC "Type1 IOMMU driver for VFIO"
49 static bool allow_unsafe_interrupts
;
50 module_param_named(allow_unsafe_interrupts
,
51 allow_unsafe_interrupts
, bool, S_IRUGO
| S_IWUSR
);
52 MODULE_PARM_DESC(allow_unsafe_interrupts
,
53 "Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
55 static bool disable_hugepages
;
56 module_param_named(disable_hugepages
,
57 disable_hugepages
, bool, S_IRUGO
| S_IWUSR
);
58 MODULE_PARM_DESC(disable_hugepages
,
59 "Disable VFIO IOMMU support for IOMMU hugepages.");
61 static unsigned int dma_entry_limit __read_mostly
= U16_MAX
;
62 module_param_named(dma_entry_limit
, dma_entry_limit
, uint
, 0644);
63 MODULE_PARM_DESC(dma_entry_limit
,
64 "Maximum number of user DMA mappings per container (65535).");
67 struct list_head domain_list
;
68 struct vfio_domain
*external_domain
; /* domain for external user */
70 struct rb_root dma_list
;
71 struct blocking_notifier_head notifier
;
72 unsigned int dma_avail
;
78 struct iommu_domain
*domain
;
79 struct list_head next
;
80 struct list_head group_list
;
81 int prot
; /* IOMMU_CACHE */
82 bool fgsp
; /* Fine-grained super pages */
87 dma_addr_t iova
; /* Device address */
88 unsigned long vaddr
; /* Process virtual addr */
89 size_t size
; /* Map size (bytes) */
90 int prot
; /* IOMMU_READ/WRITE */
92 bool lock_cap
; /* capable(CAP_IPC_LOCK) */
93 struct task_struct
*task
;
94 struct rb_root pfn_list
; /* Ex-user pinned pfn list */
98 struct iommu_group
*iommu_group
;
99 struct list_head next
;
103 * Guest RAM pinning working set or DMA target
107 dma_addr_t iova
; /* Device address */
108 unsigned long pfn
; /* Host pfn */
112 struct vfio_regions
{
113 struct list_head list
;
119 #define IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu) \
120 (!list_empty(&iommu->domain_list))
122 static int put_pfn(unsigned long pfn
, int prot
);
125 * This code handles mapping and unmapping of user data buffers
126 * into DMA'ble space using the IOMMU
129 static struct vfio_dma
*vfio_find_dma(struct vfio_iommu
*iommu
,
130 dma_addr_t start
, size_t size
)
132 struct rb_node
*node
= iommu
->dma_list
.rb_node
;
135 struct vfio_dma
*dma
= rb_entry(node
, struct vfio_dma
, node
);
137 if (start
+ size
<= dma
->iova
)
138 node
= node
->rb_left
;
139 else if (start
>= dma
->iova
+ dma
->size
)
140 node
= node
->rb_right
;
148 static void vfio_link_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*new)
150 struct rb_node
**link
= &iommu
->dma_list
.rb_node
, *parent
= NULL
;
151 struct vfio_dma
*dma
;
155 dma
= rb_entry(parent
, struct vfio_dma
, node
);
157 if (new->iova
+ new->size
<= dma
->iova
)
158 link
= &(*link
)->rb_left
;
160 link
= &(*link
)->rb_right
;
163 rb_link_node(&new->node
, parent
, link
);
164 rb_insert_color(&new->node
, &iommu
->dma_list
);
167 static void vfio_unlink_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*old
)
169 rb_erase(&old
->node
, &iommu
->dma_list
);
173 * Helper Functions for host iova-pfn list
175 static struct vfio_pfn
*vfio_find_vpfn(struct vfio_dma
*dma
, dma_addr_t iova
)
177 struct vfio_pfn
*vpfn
;
178 struct rb_node
*node
= dma
->pfn_list
.rb_node
;
181 vpfn
= rb_entry(node
, struct vfio_pfn
, node
);
183 if (iova
< vpfn
->iova
)
184 node
= node
->rb_left
;
185 else if (iova
> vpfn
->iova
)
186 node
= node
->rb_right
;
193 static void vfio_link_pfn(struct vfio_dma
*dma
,
194 struct vfio_pfn
*new)
196 struct rb_node
**link
, *parent
= NULL
;
197 struct vfio_pfn
*vpfn
;
199 link
= &dma
->pfn_list
.rb_node
;
202 vpfn
= rb_entry(parent
, struct vfio_pfn
, node
);
204 if (new->iova
< vpfn
->iova
)
205 link
= &(*link
)->rb_left
;
207 link
= &(*link
)->rb_right
;
210 rb_link_node(&new->node
, parent
, link
);
211 rb_insert_color(&new->node
, &dma
->pfn_list
);
214 static void vfio_unlink_pfn(struct vfio_dma
*dma
, struct vfio_pfn
*old
)
216 rb_erase(&old
->node
, &dma
->pfn_list
);
219 static int vfio_add_to_pfn_list(struct vfio_dma
*dma
, dma_addr_t iova
,
222 struct vfio_pfn
*vpfn
;
224 vpfn
= kzalloc(sizeof(*vpfn
), GFP_KERNEL
);
230 atomic_set(&vpfn
->ref_count
, 1);
231 vfio_link_pfn(dma
, vpfn
);
235 static void vfio_remove_from_pfn_list(struct vfio_dma
*dma
,
236 struct vfio_pfn
*vpfn
)
238 vfio_unlink_pfn(dma
, vpfn
);
242 static struct vfio_pfn
*vfio_iova_get_vfio_pfn(struct vfio_dma
*dma
,
245 struct vfio_pfn
*vpfn
= vfio_find_vpfn(dma
, iova
);
248 atomic_inc(&vpfn
->ref_count
);
252 static int vfio_iova_put_vfio_pfn(struct vfio_dma
*dma
, struct vfio_pfn
*vpfn
)
256 if (atomic_dec_and_test(&vpfn
->ref_count
)) {
257 ret
= put_pfn(vpfn
->pfn
, dma
->prot
);
258 vfio_remove_from_pfn_list(dma
, vpfn
);
263 static int vfio_lock_acct(struct vfio_dma
*dma
, long npage
, bool async
)
265 struct mm_struct
*mm
;
271 mm
= async
? get_task_mm(dma
->task
) : dma
->task
->mm
;
273 return -ESRCH
; /* process exited */
275 ret
= down_write_killable(&mm
->mmap_sem
);
278 if (!dma
->lock_cap
) {
281 limit
= task_rlimit(dma
->task
,
282 RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
284 if (mm
->locked_vm
+ npage
> limit
)
290 mm
->locked_vm
+= npage
;
292 up_write(&mm
->mmap_sem
);
302 * Some mappings aren't backed by a struct page, for example an mmap'd
303 * MMIO range for our own or another device. These use a different
304 * pfn conversion and shouldn't be tracked as locked pages.
306 static bool is_invalid_reserved_pfn(unsigned long pfn
)
308 if (pfn_valid(pfn
)) {
310 struct page
*tail
= pfn_to_page(pfn
);
311 struct page
*head
= compound_head(tail
);
312 reserved
= !!(PageReserved(head
));
315 * "head" is not a dangling pointer
316 * (compound_head takes care of that)
317 * but the hugepage may have been split
318 * from under us (and we may not hold a
319 * reference count on the head page so it can
320 * be reused before we run PageReferenced), so
321 * we've to check PageTail before returning
328 return PageReserved(tail
);
334 static int put_pfn(unsigned long pfn
, int prot
)
336 if (!is_invalid_reserved_pfn(pfn
)) {
337 struct page
*page
= pfn_to_page(pfn
);
338 if (prot
& IOMMU_WRITE
)
346 static int vaddr_get_pfn(struct mm_struct
*mm
, unsigned long vaddr
,
347 int prot
, unsigned long *pfn
)
349 struct page
*page
[1];
350 struct vm_area_struct
*vma
;
351 struct vm_area_struct
*vmas
[1];
352 unsigned int flags
= 0;
355 if (prot
& IOMMU_WRITE
)
358 down_read(&mm
->mmap_sem
);
359 if (mm
== current
->mm
) {
360 ret
= get_user_pages_longterm(vaddr
, 1, flags
, page
, vmas
);
362 ret
= get_user_pages_remote(NULL
, mm
, vaddr
, 1, flags
, page
,
365 * The lifetime of a vaddr_get_pfn() page pin is
366 * userspace-controlled. In the fs-dax case this could
367 * lead to indefinite stalls in filesystem operations.
368 * Disallow attempts to pin fs-dax pages via this
371 if (ret
> 0 && vma_is_fsdax(vmas
[0])) {
376 up_read(&mm
->mmap_sem
);
379 *pfn
= page_to_pfn(page
[0]);
383 down_read(&mm
->mmap_sem
);
385 vma
= find_vma_intersection(mm
, vaddr
, vaddr
+ 1);
387 if (vma
&& vma
->vm_flags
& VM_PFNMAP
) {
388 *pfn
= ((vaddr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
389 if (is_invalid_reserved_pfn(*pfn
))
393 up_read(&mm
->mmap_sem
);
398 * Attempt to pin pages. We really don't want to track all the pfns and
399 * the iommu can only map chunks of consecutive pfns anyway, so get the
400 * first page and all consecutive pages with the same locking.
402 static long vfio_pin_pages_remote(struct vfio_dma
*dma
, unsigned long vaddr
,
403 long npage
, unsigned long *pfn_base
,
406 unsigned long pfn
= 0;
407 long ret
, pinned
= 0, lock_acct
= 0;
409 dma_addr_t iova
= vaddr
- dma
->vaddr
+ dma
->iova
;
411 /* This code path is only user initiated */
415 ret
= vaddr_get_pfn(current
->mm
, vaddr
, dma
->prot
, pfn_base
);
420 rsvd
= is_invalid_reserved_pfn(*pfn_base
);
423 * Reserved pages aren't counted against the user, externally pinned
424 * pages are already counted against the user.
426 if (!rsvd
&& !vfio_find_vpfn(dma
, iova
)) {
427 if (!dma
->lock_cap
&& current
->mm
->locked_vm
+ 1 > limit
) {
428 put_pfn(*pfn_base
, dma
->prot
);
429 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__
,
430 limit
<< PAGE_SHIFT
);
436 if (unlikely(disable_hugepages
))
439 /* Lock all the consecutive pages from pfn_base */
440 for (vaddr
+= PAGE_SIZE
, iova
+= PAGE_SIZE
; pinned
< npage
;
441 pinned
++, vaddr
+= PAGE_SIZE
, iova
+= PAGE_SIZE
) {
442 ret
= vaddr_get_pfn(current
->mm
, vaddr
, dma
->prot
, &pfn
);
446 if (pfn
!= *pfn_base
+ pinned
||
447 rsvd
!= is_invalid_reserved_pfn(pfn
)) {
448 put_pfn(pfn
, dma
->prot
);
452 if (!rsvd
&& !vfio_find_vpfn(dma
, iova
)) {
453 if (!dma
->lock_cap
&&
454 current
->mm
->locked_vm
+ lock_acct
+ 1 > limit
) {
455 put_pfn(pfn
, dma
->prot
);
456 pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
457 __func__
, limit
<< PAGE_SHIFT
);
466 ret
= vfio_lock_acct(dma
, lock_acct
, false);
471 for (pfn
= *pfn_base
; pinned
; pfn
++, pinned
--)
472 put_pfn(pfn
, dma
->prot
);
481 static long vfio_unpin_pages_remote(struct vfio_dma
*dma
, dma_addr_t iova
,
482 unsigned long pfn
, long npage
,
485 long unlocked
= 0, locked
= 0;
488 for (i
= 0; i
< npage
; i
++, iova
+= PAGE_SIZE
) {
489 if (put_pfn(pfn
++, dma
->prot
)) {
491 if (vfio_find_vpfn(dma
, iova
))
497 vfio_lock_acct(dma
, locked
- unlocked
, true);
502 static int vfio_pin_page_external(struct vfio_dma
*dma
, unsigned long vaddr
,
503 unsigned long *pfn_base
, bool do_accounting
)
505 struct mm_struct
*mm
;
508 mm
= get_task_mm(dma
->task
);
512 ret
= vaddr_get_pfn(mm
, vaddr
, dma
->prot
, pfn_base
);
513 if (!ret
&& do_accounting
&& !is_invalid_reserved_pfn(*pfn_base
)) {
514 ret
= vfio_lock_acct(dma
, 1, true);
516 put_pfn(*pfn_base
, dma
->prot
);
518 pr_warn("%s: Task %s (%d) RLIMIT_MEMLOCK "
519 "(%ld) exceeded\n", __func__
,
520 dma
->task
->comm
, task_pid_nr(dma
->task
),
521 task_rlimit(dma
->task
, RLIMIT_MEMLOCK
));
529 static int vfio_unpin_page_external(struct vfio_dma
*dma
, dma_addr_t iova
,
533 struct vfio_pfn
*vpfn
= vfio_find_vpfn(dma
, iova
);
538 unlocked
= vfio_iova_put_vfio_pfn(dma
, vpfn
);
541 vfio_lock_acct(dma
, -unlocked
, true);
546 static int vfio_iommu_type1_pin_pages(void *iommu_data
,
547 unsigned long *user_pfn
,
549 unsigned long *phys_pfn
)
551 struct vfio_iommu
*iommu
= iommu_data
;
553 unsigned long remote_vaddr
;
554 struct vfio_dma
*dma
;
557 if (!iommu
|| !user_pfn
|| !phys_pfn
)
560 /* Supported for v2 version only */
564 mutex_lock(&iommu
->lock
);
566 /* Fail if notifier list is empty */
567 if ((!iommu
->external_domain
) || (!iommu
->notifier
.head
)) {
573 * If iommu capable domain exist in the container then all pages are
574 * already pinned and accounted. Accouting should be done if there is no
575 * iommu capable domain in the container.
577 do_accounting
= !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
);
579 for (i
= 0; i
< npage
; i
++) {
581 struct vfio_pfn
*vpfn
;
583 iova
= user_pfn
[i
] << PAGE_SHIFT
;
584 dma
= vfio_find_dma(iommu
, iova
, PAGE_SIZE
);
590 if ((dma
->prot
& prot
) != prot
) {
595 vpfn
= vfio_iova_get_vfio_pfn(dma
, iova
);
597 phys_pfn
[i
] = vpfn
->pfn
;
601 remote_vaddr
= dma
->vaddr
+ iova
- dma
->iova
;
602 ret
= vfio_pin_page_external(dma
, remote_vaddr
, &phys_pfn
[i
],
607 ret
= vfio_add_to_pfn_list(dma
, iova
, phys_pfn
[i
]);
609 vfio_unpin_page_external(dma
, iova
, do_accounting
);
619 for (j
= 0; j
< i
; j
++) {
622 iova
= user_pfn
[j
] << PAGE_SHIFT
;
623 dma
= vfio_find_dma(iommu
, iova
, PAGE_SIZE
);
624 vfio_unpin_page_external(dma
, iova
, do_accounting
);
628 mutex_unlock(&iommu
->lock
);
632 static int vfio_iommu_type1_unpin_pages(void *iommu_data
,
633 unsigned long *user_pfn
,
636 struct vfio_iommu
*iommu
= iommu_data
;
640 if (!iommu
|| !user_pfn
)
643 /* Supported for v2 version only */
647 mutex_lock(&iommu
->lock
);
649 if (!iommu
->external_domain
) {
650 mutex_unlock(&iommu
->lock
);
654 do_accounting
= !IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
);
655 for (i
= 0; i
< npage
; i
++) {
656 struct vfio_dma
*dma
;
659 iova
= user_pfn
[i
] << PAGE_SHIFT
;
660 dma
= vfio_find_dma(iommu
, iova
, PAGE_SIZE
);
663 vfio_unpin_page_external(dma
, iova
, do_accounting
);
667 mutex_unlock(&iommu
->lock
);
668 return i
> npage
? npage
: (i
> 0 ? i
: -EINVAL
);
671 static long vfio_sync_unpin(struct vfio_dma
*dma
, struct vfio_domain
*domain
,
672 struct list_head
*regions
)
675 struct vfio_regions
*entry
, *next
;
677 iommu_tlb_sync(domain
->domain
);
679 list_for_each_entry_safe(entry
, next
, regions
, list
) {
680 unlocked
+= vfio_unpin_pages_remote(dma
,
682 entry
->phys
>> PAGE_SHIFT
,
683 entry
->len
>> PAGE_SHIFT
,
685 list_del(&entry
->list
);
695 * Generally, VFIO needs to unpin remote pages after each IOTLB flush.
696 * Therefore, when using IOTLB flush sync interface, VFIO need to keep track
697 * of these regions (currently using a list).
699 * This value specifies maximum number of regions for each IOTLB flush sync.
701 #define VFIO_IOMMU_TLB_SYNC_MAX 512
703 static size_t unmap_unpin_fast(struct vfio_domain
*domain
,
704 struct vfio_dma
*dma
, dma_addr_t
*iova
,
705 size_t len
, phys_addr_t phys
, long *unlocked
,
706 struct list_head
*unmapped_list
,
710 struct vfio_regions
*entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
713 unmapped
= iommu_unmap_fast(domain
->domain
, *iova
, len
);
718 iommu_tlb_range_add(domain
->domain
, *iova
, unmapped
);
721 entry
->len
= unmapped
;
722 list_add_tail(&entry
->list
, unmapped_list
);
730 * Sync if the number of fast-unmap regions hits the limit
731 * or in case of errors.
733 if (*unmapped_cnt
>= VFIO_IOMMU_TLB_SYNC_MAX
|| !unmapped
) {
734 *unlocked
+= vfio_sync_unpin(dma
, domain
,
742 static size_t unmap_unpin_slow(struct vfio_domain
*domain
,
743 struct vfio_dma
*dma
, dma_addr_t
*iova
,
744 size_t len
, phys_addr_t phys
,
747 size_t unmapped
= iommu_unmap(domain
->domain
, *iova
, len
);
750 *unlocked
+= vfio_unpin_pages_remote(dma
, *iova
,
752 unmapped
>> PAGE_SHIFT
,
760 static long vfio_unmap_unpin(struct vfio_iommu
*iommu
, struct vfio_dma
*dma
,
763 dma_addr_t iova
= dma
->iova
, end
= dma
->iova
+ dma
->size
;
764 struct vfio_domain
*domain
, *d
;
765 LIST_HEAD(unmapped_region_list
);
766 int unmapped_region_cnt
= 0;
772 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
))
776 * We use the IOMMU to track the physical addresses, otherwise we'd
777 * need a much more complicated tracking system. Unfortunately that
778 * means we need to use one of the iommu domains to figure out the
779 * pfns to unpin. The rest need to be unmapped in advance so we have
780 * no iommu translations remaining when the pages are unpinned.
782 domain
= d
= list_first_entry(&iommu
->domain_list
,
783 struct vfio_domain
, next
);
785 list_for_each_entry_continue(d
, &iommu
->domain_list
, next
) {
786 iommu_unmap(d
->domain
, dma
->iova
, dma
->size
);
791 size_t unmapped
, len
;
792 phys_addr_t phys
, next
;
794 phys
= iommu_iova_to_phys(domain
->domain
, iova
);
795 if (WARN_ON(!phys
)) {
801 * To optimize for fewer iommu_unmap() calls, each of which
802 * may require hardware cache flushing, try to find the
803 * largest contiguous physical memory chunk to unmap.
805 for (len
= PAGE_SIZE
;
806 !domain
->fgsp
&& iova
+ len
< end
; len
+= PAGE_SIZE
) {
807 next
= iommu_iova_to_phys(domain
->domain
, iova
+ len
);
808 if (next
!= phys
+ len
)
813 * First, try to use fast unmap/unpin. In case of failure,
814 * switch to slow unmap/unpin path.
816 unmapped
= unmap_unpin_fast(domain
, dma
, &iova
, len
, phys
,
817 &unlocked
, &unmapped_region_list
,
818 &unmapped_region_cnt
);
820 unmapped
= unmap_unpin_slow(domain
, dma
, &iova
, len
,
822 if (WARN_ON(!unmapped
))
827 dma
->iommu_mapped
= false;
829 if (unmapped_region_cnt
)
830 unlocked
+= vfio_sync_unpin(dma
, domain
, &unmapped_region_list
);
833 vfio_lock_acct(dma
, -unlocked
, true);
839 static void vfio_remove_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*dma
)
841 vfio_unmap_unpin(iommu
, dma
, true);
842 vfio_unlink_dma(iommu
, dma
);
843 put_task_struct(dma
->task
);
848 static unsigned long vfio_pgsize_bitmap(struct vfio_iommu
*iommu
)
850 struct vfio_domain
*domain
;
851 unsigned long bitmap
= ULONG_MAX
;
853 mutex_lock(&iommu
->lock
);
854 list_for_each_entry(domain
, &iommu
->domain_list
, next
)
855 bitmap
&= domain
->domain
->pgsize_bitmap
;
856 mutex_unlock(&iommu
->lock
);
859 * In case the IOMMU supports page sizes smaller than PAGE_SIZE
860 * we pretend PAGE_SIZE is supported and hide sub-PAGE_SIZE sizes.
861 * That way the user will be able to map/unmap buffers whose size/
862 * start address is aligned with PAGE_SIZE. Pinning code uses that
863 * granularity while iommu driver can use the sub-PAGE_SIZE size
866 if (bitmap
& ~PAGE_MASK
) {
874 static int vfio_dma_do_unmap(struct vfio_iommu
*iommu
,
875 struct vfio_iommu_type1_dma_unmap
*unmap
)
878 struct vfio_dma
*dma
, *dma_last
= NULL
;
880 int ret
= 0, retries
= 0;
882 mask
= ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu
))) - 1;
884 if (unmap
->iova
& mask
)
886 if (!unmap
->size
|| unmap
->size
& mask
)
888 if (unmap
->iova
+ unmap
->size
- 1 < unmap
->iova
||
889 unmap
->size
> SIZE_MAX
)
892 WARN_ON(mask
& PAGE_MASK
);
894 mutex_lock(&iommu
->lock
);
897 * vfio-iommu-type1 (v1) - User mappings were coalesced together to
898 * avoid tracking individual mappings. This means that the granularity
899 * of the original mapping was lost and the user was allowed to attempt
900 * to unmap any range. Depending on the contiguousness of physical
901 * memory and page sizes supported by the IOMMU, arbitrary unmaps may
902 * or may not have worked. We only guaranteed unmap granularity
903 * matching the original mapping; even though it was untracked here,
904 * the original mappings are reflected in IOMMU mappings. This
905 * resulted in a couple unusual behaviors. First, if a range is not
906 * able to be unmapped, ex. a set of 4k pages that was mapped as a
907 * 2M hugepage into the IOMMU, the unmap ioctl returns success but with
908 * a zero sized unmap. Also, if an unmap request overlaps the first
909 * address of a hugepage, the IOMMU will unmap the entire hugepage.
910 * This also returns success and the returned unmap size reflects the
911 * actual size unmapped.
913 * We attempt to maintain compatibility with this "v1" interface, but
914 * we take control out of the hands of the IOMMU. Therefore, an unmap
915 * request offset from the beginning of the original mapping will
916 * return success with zero sized unmap. And an unmap request covering
917 * the first iova of mapping will unmap the entire range.
919 * The v2 version of this interface intends to be more deterministic.
920 * Unmap requests must fully cover previous mappings. Multiple
921 * mappings may still be unmaped by specifying large ranges, but there
922 * must not be any previous mappings bisected by the range. An error
923 * will be returned if these conditions are not met. The v2 interface
924 * will only return success and a size of zero if there were no
925 * mappings within the range.
928 dma
= vfio_find_dma(iommu
, unmap
->iova
, 1);
929 if (dma
&& dma
->iova
!= unmap
->iova
) {
933 dma
= vfio_find_dma(iommu
, unmap
->iova
+ unmap
->size
- 1, 0);
934 if (dma
&& dma
->iova
+ dma
->size
!= unmap
->iova
+ unmap
->size
) {
940 while ((dma
= vfio_find_dma(iommu
, unmap
->iova
, unmap
->size
))) {
941 if (!iommu
->v2
&& unmap
->iova
> dma
->iova
)
944 * Task with same address space who mapped this iova range is
945 * allowed to unmap the iova range.
947 if (dma
->task
->mm
!= current
->mm
)
950 if (!RB_EMPTY_ROOT(&dma
->pfn_list
)) {
951 struct vfio_iommu_type1_dma_unmap nb_unmap
;
953 if (dma_last
== dma
) {
954 BUG_ON(++retries
> 10);
960 nb_unmap
.iova
= dma
->iova
;
961 nb_unmap
.size
= dma
->size
;
964 * Notify anyone (mdev vendor drivers) to invalidate and
965 * unmap iovas within the range we're about to unmap.
966 * Vendor drivers MUST unpin pages in response to an
969 mutex_unlock(&iommu
->lock
);
970 blocking_notifier_call_chain(&iommu
->notifier
,
971 VFIO_IOMMU_NOTIFY_DMA_UNMAP
,
975 unmapped
+= dma
->size
;
976 vfio_remove_dma(iommu
, dma
);
980 mutex_unlock(&iommu
->lock
);
982 /* Report how much was unmapped */
983 unmap
->size
= unmapped
;
988 static int vfio_iommu_map(struct vfio_iommu
*iommu
, dma_addr_t iova
,
989 unsigned long pfn
, long npage
, int prot
)
991 struct vfio_domain
*d
;
994 list_for_each_entry(d
, &iommu
->domain_list
, next
) {
995 ret
= iommu_map(d
->domain
, iova
, (phys_addr_t
)pfn
<< PAGE_SHIFT
,
996 npage
<< PAGE_SHIFT
, prot
| d
->prot
);
1006 list_for_each_entry_continue_reverse(d
, &iommu
->domain_list
, next
)
1007 iommu_unmap(d
->domain
, iova
, npage
<< PAGE_SHIFT
);
1012 static int vfio_pin_map_dma(struct vfio_iommu
*iommu
, struct vfio_dma
*dma
,
1015 dma_addr_t iova
= dma
->iova
;
1016 unsigned long vaddr
= dma
->vaddr
;
1017 size_t size
= map_size
;
1019 unsigned long pfn
, limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
1023 /* Pin a contiguous chunk of memory */
1024 npage
= vfio_pin_pages_remote(dma
, vaddr
+ dma
->size
,
1025 size
>> PAGE_SHIFT
, &pfn
, limit
);
1033 ret
= vfio_iommu_map(iommu
, iova
+ dma
->size
, pfn
, npage
,
1036 vfio_unpin_pages_remote(dma
, iova
+ dma
->size
, pfn
,
1041 size
-= npage
<< PAGE_SHIFT
;
1042 dma
->size
+= npage
<< PAGE_SHIFT
;
1045 dma
->iommu_mapped
= true;
1048 vfio_remove_dma(iommu
, dma
);
1053 static int vfio_dma_do_map(struct vfio_iommu
*iommu
,
1054 struct vfio_iommu_type1_dma_map
*map
)
1056 dma_addr_t iova
= map
->iova
;
1057 unsigned long vaddr
= map
->vaddr
;
1058 size_t size
= map
->size
;
1059 int ret
= 0, prot
= 0;
1061 struct vfio_dma
*dma
;
1063 /* Verify that none of our __u64 fields overflow */
1064 if (map
->size
!= size
|| map
->vaddr
!= vaddr
|| map
->iova
!= iova
)
1067 mask
= ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu
))) - 1;
1069 WARN_ON(mask
& PAGE_MASK
);
1071 /* READ/WRITE from device perspective */
1072 if (map
->flags
& VFIO_DMA_MAP_FLAG_WRITE
)
1073 prot
|= IOMMU_WRITE
;
1074 if (map
->flags
& VFIO_DMA_MAP_FLAG_READ
)
1077 if (!prot
|| !size
|| (size
| iova
| vaddr
) & mask
)
1080 /* Don't allow IOVA or virtual address wrap */
1081 if (iova
+ size
- 1 < iova
|| vaddr
+ size
- 1 < vaddr
)
1084 mutex_lock(&iommu
->lock
);
1086 if (vfio_find_dma(iommu
, iova
, size
)) {
1091 if (!iommu
->dma_avail
) {
1096 dma
= kzalloc(sizeof(*dma
), GFP_KERNEL
);
1108 * We need to be able to both add to a task's locked memory and test
1109 * against the locked memory limit and we need to be able to do both
1110 * outside of this call path as pinning can be asynchronous via the
1111 * external interfaces for mdev devices. RLIMIT_MEMLOCK requires a
1112 * task_struct and VM locked pages requires an mm_struct, however
1113 * holding an indefinite mm reference is not recommended, therefore we
1114 * only hold a reference to a task. We could hold a reference to
1115 * current, however QEMU uses this call path through vCPU threads,
1116 * which can be killed resulting in a NULL mm and failure in the unmap
1117 * path when called via a different thread. Avoid this problem by
1118 * using the group_leader as threads within the same group require
1119 * both CLONE_THREAD and CLONE_VM and will therefore use the same
1122 * Previously we also used the task for testing CAP_IPC_LOCK at the
1123 * time of pinning and accounting, however has_capability() makes use
1124 * of real_cred, a copy-on-write field, so we can't guarantee that it
1125 * matches group_leader, or in fact that it might not change by the
1126 * time it's evaluated. If a process were to call MAP_DMA with
1127 * CAP_IPC_LOCK but later drop it, it doesn't make sense that they
1128 * possibly see different results for an iommu_mapped vfio_dma vs
1129 * externally mapped. Therefore track CAP_IPC_LOCK in vfio_dma at the
1130 * time of calling MAP_DMA.
1132 get_task_struct(current
->group_leader
);
1133 dma
->task
= current
->group_leader
;
1134 dma
->lock_cap
= capable(CAP_IPC_LOCK
);
1136 dma
->pfn_list
= RB_ROOT
;
1138 /* Insert zero-sized and grow as we map chunks of it */
1139 vfio_link_dma(iommu
, dma
);
1141 /* Don't pin and map if container doesn't contain IOMMU capable domain*/
1142 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
))
1145 ret
= vfio_pin_map_dma(iommu
, dma
, size
);
1148 mutex_unlock(&iommu
->lock
);
1152 static int vfio_bus_type(struct device
*dev
, void *data
)
1154 struct bus_type
**bus
= data
;
1156 if (*bus
&& *bus
!= dev
->bus
)
1164 static int vfio_iommu_replay(struct vfio_iommu
*iommu
,
1165 struct vfio_domain
*domain
)
1167 struct vfio_domain
*d
;
1169 unsigned long limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
1172 /* Arbitrarily pick the first domain in the list for lookups */
1173 d
= list_first_entry(&iommu
->domain_list
, struct vfio_domain
, next
);
1174 n
= rb_first(&iommu
->dma_list
);
1176 for (; n
; n
= rb_next(n
)) {
1177 struct vfio_dma
*dma
;
1180 dma
= rb_entry(n
, struct vfio_dma
, node
);
1183 while (iova
< dma
->iova
+ dma
->size
) {
1187 if (dma
->iommu_mapped
) {
1191 phys
= iommu_iova_to_phys(d
->domain
, iova
);
1193 if (WARN_ON(!phys
)) {
1201 while (i
< dma
->iova
+ dma
->size
&&
1202 p
== iommu_iova_to_phys(d
->domain
, i
)) {
1209 unsigned long vaddr
= dma
->vaddr
+
1211 size_t n
= dma
->iova
+ dma
->size
- iova
;
1214 npage
= vfio_pin_pages_remote(dma
, vaddr
,
1223 phys
= pfn
<< PAGE_SHIFT
;
1224 size
= npage
<< PAGE_SHIFT
;
1227 ret
= iommu_map(domain
->domain
, iova
, phys
,
1228 size
, dma
->prot
| domain
->prot
);
1234 dma
->iommu_mapped
= true;
1240 * We change our unmap behavior slightly depending on whether the IOMMU
1241 * supports fine-grained superpages. IOMMUs like AMD-Vi will use a superpage
1242 * for practically any contiguous power-of-two mapping we give it. This means
1243 * we don't need to look for contiguous chunks ourselves to make unmapping
1244 * more efficient. On IOMMUs with coarse-grained super pages, like Intel VT-d
1245 * with discrete 2M/1G/512G/1T superpages, identifying contiguous chunks
1246 * significantly boosts non-hugetlbfs mappings and doesn't seem to hurt when
1247 * hugetlbfs is in use.
1249 static void vfio_test_domain_fgsp(struct vfio_domain
*domain
)
1252 int ret
, order
= get_order(PAGE_SIZE
* 2);
1254 pages
= alloc_pages(GFP_KERNEL
| __GFP_ZERO
, order
);
1258 ret
= iommu_map(domain
->domain
, 0, page_to_phys(pages
), PAGE_SIZE
* 2,
1259 IOMMU_READ
| IOMMU_WRITE
| domain
->prot
);
1261 size_t unmapped
= iommu_unmap(domain
->domain
, 0, PAGE_SIZE
);
1263 if (unmapped
== PAGE_SIZE
)
1264 iommu_unmap(domain
->domain
, PAGE_SIZE
, PAGE_SIZE
);
1266 domain
->fgsp
= true;
1269 __free_pages(pages
, order
);
1272 static struct vfio_group
*find_iommu_group(struct vfio_domain
*domain
,
1273 struct iommu_group
*iommu_group
)
1275 struct vfio_group
*g
;
1277 list_for_each_entry(g
, &domain
->group_list
, next
) {
1278 if (g
->iommu_group
== iommu_group
)
1285 static bool vfio_iommu_has_sw_msi(struct iommu_group
*group
, phys_addr_t
*base
)
1287 struct list_head group_resv_regions
;
1288 struct iommu_resv_region
*region
, *next
;
1291 INIT_LIST_HEAD(&group_resv_regions
);
1292 iommu_get_group_resv_regions(group
, &group_resv_regions
);
1293 list_for_each_entry(region
, &group_resv_regions
, list
) {
1295 * The presence of any 'real' MSI regions should take
1296 * precedence over the software-managed one if the
1297 * IOMMU driver happens to advertise both types.
1299 if (region
->type
== IOMMU_RESV_MSI
) {
1304 if (region
->type
== IOMMU_RESV_SW_MSI
) {
1305 *base
= region
->start
;
1309 list_for_each_entry_safe(region
, next
, &group_resv_regions
, list
)
1314 static int vfio_iommu_type1_attach_group(void *iommu_data
,
1315 struct iommu_group
*iommu_group
)
1317 struct vfio_iommu
*iommu
= iommu_data
;
1318 struct vfio_group
*group
;
1319 struct vfio_domain
*domain
, *d
;
1320 struct bus_type
*bus
= NULL
, *mdev_bus
;
1322 bool resv_msi
, msi_remap
;
1323 phys_addr_t resv_msi_base
;
1325 mutex_lock(&iommu
->lock
);
1327 list_for_each_entry(d
, &iommu
->domain_list
, next
) {
1328 if (find_iommu_group(d
, iommu_group
)) {
1329 mutex_unlock(&iommu
->lock
);
1334 if (iommu
->external_domain
) {
1335 if (find_iommu_group(iommu
->external_domain
, iommu_group
)) {
1336 mutex_unlock(&iommu
->lock
);
1341 group
= kzalloc(sizeof(*group
), GFP_KERNEL
);
1342 domain
= kzalloc(sizeof(*domain
), GFP_KERNEL
);
1343 if (!group
|| !domain
) {
1348 group
->iommu_group
= iommu_group
;
1350 /* Determine bus_type in order to allocate a domain */
1351 ret
= iommu_group_for_each_dev(iommu_group
, &bus
, vfio_bus_type
);
1355 mdev_bus
= symbol_get(mdev_bus_type
);
1358 if ((bus
== mdev_bus
) && !iommu_present(bus
)) {
1359 symbol_put(mdev_bus_type
);
1360 if (!iommu
->external_domain
) {
1361 INIT_LIST_HEAD(&domain
->group_list
);
1362 iommu
->external_domain
= domain
;
1366 list_add(&group
->next
,
1367 &iommu
->external_domain
->group_list
);
1368 mutex_unlock(&iommu
->lock
);
1371 symbol_put(mdev_bus_type
);
1374 domain
->domain
= iommu_domain_alloc(bus
);
1375 if (!domain
->domain
) {
1380 if (iommu
->nesting
) {
1383 ret
= iommu_domain_set_attr(domain
->domain
, DOMAIN_ATTR_NESTING
,
1389 ret
= iommu_attach_group(domain
->domain
, iommu_group
);
1393 resv_msi
= vfio_iommu_has_sw_msi(iommu_group
, &resv_msi_base
);
1395 INIT_LIST_HEAD(&domain
->group_list
);
1396 list_add(&group
->next
, &domain
->group_list
);
1398 msi_remap
= irq_domain_check_msi_remap() ||
1399 iommu_capable(bus
, IOMMU_CAP_INTR_REMAP
);
1401 if (!allow_unsafe_interrupts
&& !msi_remap
) {
1402 pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
1408 if (iommu_capable(bus
, IOMMU_CAP_CACHE_COHERENCY
))
1409 domain
->prot
|= IOMMU_CACHE
;
1412 * Try to match an existing compatible domain. We don't want to
1413 * preclude an IOMMU driver supporting multiple bus_types and being
1414 * able to include different bus_types in the same IOMMU domain, so
1415 * we test whether the domains use the same iommu_ops rather than
1416 * testing if they're on the same bus_type.
1418 list_for_each_entry(d
, &iommu
->domain_list
, next
) {
1419 if (d
->domain
->ops
== domain
->domain
->ops
&&
1420 d
->prot
== domain
->prot
) {
1421 iommu_detach_group(domain
->domain
, iommu_group
);
1422 if (!iommu_attach_group(d
->domain
, iommu_group
)) {
1423 list_add(&group
->next
, &d
->group_list
);
1424 iommu_domain_free(domain
->domain
);
1426 mutex_unlock(&iommu
->lock
);
1430 ret
= iommu_attach_group(domain
->domain
, iommu_group
);
1436 vfio_test_domain_fgsp(domain
);
1438 /* replay mappings on new domains */
1439 ret
= vfio_iommu_replay(iommu
, domain
);
1444 ret
= iommu_get_msi_cookie(domain
->domain
, resv_msi_base
);
1449 list_add(&domain
->next
, &iommu
->domain_list
);
1451 mutex_unlock(&iommu
->lock
);
1456 iommu_detach_group(domain
->domain
, iommu_group
);
1458 iommu_domain_free(domain
->domain
);
1462 mutex_unlock(&iommu
->lock
);
1466 static void vfio_iommu_unmap_unpin_all(struct vfio_iommu
*iommu
)
1468 struct rb_node
*node
;
1470 while ((node
= rb_first(&iommu
->dma_list
)))
1471 vfio_remove_dma(iommu
, rb_entry(node
, struct vfio_dma
, node
));
1474 static void vfio_iommu_unmap_unpin_reaccount(struct vfio_iommu
*iommu
)
1476 struct rb_node
*n
, *p
;
1478 n
= rb_first(&iommu
->dma_list
);
1479 for (; n
; n
= rb_next(n
)) {
1480 struct vfio_dma
*dma
;
1481 long locked
= 0, unlocked
= 0;
1483 dma
= rb_entry(n
, struct vfio_dma
, node
);
1484 unlocked
+= vfio_unmap_unpin(iommu
, dma
, false);
1485 p
= rb_first(&dma
->pfn_list
);
1486 for (; p
; p
= rb_next(p
)) {
1487 struct vfio_pfn
*vpfn
= rb_entry(p
, struct vfio_pfn
,
1490 if (!is_invalid_reserved_pfn(vpfn
->pfn
))
1493 vfio_lock_acct(dma
, locked
- unlocked
, true);
1497 static void vfio_sanity_check_pfn_list(struct vfio_iommu
*iommu
)
1501 n
= rb_first(&iommu
->dma_list
);
1502 for (; n
; n
= rb_next(n
)) {
1503 struct vfio_dma
*dma
;
1505 dma
= rb_entry(n
, struct vfio_dma
, node
);
1507 if (WARN_ON(!RB_EMPTY_ROOT(&dma
->pfn_list
)))
1510 /* mdev vendor driver must unregister notifier */
1511 WARN_ON(iommu
->notifier
.head
);
1514 static void vfio_iommu_type1_detach_group(void *iommu_data
,
1515 struct iommu_group
*iommu_group
)
1517 struct vfio_iommu
*iommu
= iommu_data
;
1518 struct vfio_domain
*domain
;
1519 struct vfio_group
*group
;
1521 mutex_lock(&iommu
->lock
);
1523 if (iommu
->external_domain
) {
1524 group
= find_iommu_group(iommu
->external_domain
, iommu_group
);
1526 list_del(&group
->next
);
1529 if (list_empty(&iommu
->external_domain
->group_list
)) {
1530 vfio_sanity_check_pfn_list(iommu
);
1532 if (!IS_IOMMU_CAP_DOMAIN_IN_CONTAINER(iommu
))
1533 vfio_iommu_unmap_unpin_all(iommu
);
1535 kfree(iommu
->external_domain
);
1536 iommu
->external_domain
= NULL
;
1538 goto detach_group_done
;
1542 list_for_each_entry(domain
, &iommu
->domain_list
, next
) {
1543 group
= find_iommu_group(domain
, iommu_group
);
1547 iommu_detach_group(domain
->domain
, iommu_group
);
1548 list_del(&group
->next
);
1551 * Group ownership provides privilege, if the group list is
1552 * empty, the domain goes away. If it's the last domain with
1553 * iommu and external domain doesn't exist, then all the
1554 * mappings go away too. If it's the last domain with iommu and
1555 * external domain exist, update accounting
1557 if (list_empty(&domain
->group_list
)) {
1558 if (list_is_singular(&iommu
->domain_list
)) {
1559 if (!iommu
->external_domain
)
1560 vfio_iommu_unmap_unpin_all(iommu
);
1562 vfio_iommu_unmap_unpin_reaccount(iommu
);
1564 iommu_domain_free(domain
->domain
);
1565 list_del(&domain
->next
);
1572 mutex_unlock(&iommu
->lock
);
1575 static void *vfio_iommu_type1_open(unsigned long arg
)
1577 struct vfio_iommu
*iommu
;
1579 iommu
= kzalloc(sizeof(*iommu
), GFP_KERNEL
);
1581 return ERR_PTR(-ENOMEM
);
1584 case VFIO_TYPE1_IOMMU
:
1586 case VFIO_TYPE1_NESTING_IOMMU
:
1587 iommu
->nesting
= true;
1589 case VFIO_TYPE1v2_IOMMU
:
1594 return ERR_PTR(-EINVAL
);
1597 INIT_LIST_HEAD(&iommu
->domain_list
);
1598 iommu
->dma_list
= RB_ROOT
;
1599 iommu
->dma_avail
= dma_entry_limit
;
1600 mutex_init(&iommu
->lock
);
1601 BLOCKING_INIT_NOTIFIER_HEAD(&iommu
->notifier
);
1606 static void vfio_release_domain(struct vfio_domain
*domain
, bool external
)
1608 struct vfio_group
*group
, *group_tmp
;
1610 list_for_each_entry_safe(group
, group_tmp
,
1611 &domain
->group_list
, next
) {
1613 iommu_detach_group(domain
->domain
, group
->iommu_group
);
1614 list_del(&group
->next
);
1619 iommu_domain_free(domain
->domain
);
1622 static void vfio_iommu_type1_release(void *iommu_data
)
1624 struct vfio_iommu
*iommu
= iommu_data
;
1625 struct vfio_domain
*domain
, *domain_tmp
;
1627 if (iommu
->external_domain
) {
1628 vfio_release_domain(iommu
->external_domain
, true);
1629 vfio_sanity_check_pfn_list(iommu
);
1630 kfree(iommu
->external_domain
);
1633 vfio_iommu_unmap_unpin_all(iommu
);
1635 list_for_each_entry_safe(domain
, domain_tmp
,
1636 &iommu
->domain_list
, next
) {
1637 vfio_release_domain(domain
, false);
1638 list_del(&domain
->next
);
1644 static int vfio_domains_have_iommu_cache(struct vfio_iommu
*iommu
)
1646 struct vfio_domain
*domain
;
1649 mutex_lock(&iommu
->lock
);
1650 list_for_each_entry(domain
, &iommu
->domain_list
, next
) {
1651 if (!(domain
->prot
& IOMMU_CACHE
)) {
1656 mutex_unlock(&iommu
->lock
);
1661 static long vfio_iommu_type1_ioctl(void *iommu_data
,
1662 unsigned int cmd
, unsigned long arg
)
1664 struct vfio_iommu
*iommu
= iommu_data
;
1665 unsigned long minsz
;
1667 if (cmd
== VFIO_CHECK_EXTENSION
) {
1669 case VFIO_TYPE1_IOMMU
:
1670 case VFIO_TYPE1v2_IOMMU
:
1671 case VFIO_TYPE1_NESTING_IOMMU
:
1673 case VFIO_DMA_CC_IOMMU
:
1676 return vfio_domains_have_iommu_cache(iommu
);
1680 } else if (cmd
== VFIO_IOMMU_GET_INFO
) {
1681 struct vfio_iommu_type1_info info
;
1683 minsz
= offsetofend(struct vfio_iommu_type1_info
, iova_pgsizes
);
1685 if (copy_from_user(&info
, (void __user
*)arg
, minsz
))
1688 if (info
.argsz
< minsz
)
1691 info
.flags
= VFIO_IOMMU_INFO_PGSIZES
;
1693 info
.iova_pgsizes
= vfio_pgsize_bitmap(iommu
);
1695 return copy_to_user((void __user
*)arg
, &info
, minsz
) ?
1698 } else if (cmd
== VFIO_IOMMU_MAP_DMA
) {
1699 struct vfio_iommu_type1_dma_map map
;
1700 uint32_t mask
= VFIO_DMA_MAP_FLAG_READ
|
1701 VFIO_DMA_MAP_FLAG_WRITE
;
1703 minsz
= offsetofend(struct vfio_iommu_type1_dma_map
, size
);
1705 if (copy_from_user(&map
, (void __user
*)arg
, minsz
))
1708 if (map
.argsz
< minsz
|| map
.flags
& ~mask
)
1711 return vfio_dma_do_map(iommu
, &map
);
1713 } else if (cmd
== VFIO_IOMMU_UNMAP_DMA
) {
1714 struct vfio_iommu_type1_dma_unmap unmap
;
1717 minsz
= offsetofend(struct vfio_iommu_type1_dma_unmap
, size
);
1719 if (copy_from_user(&unmap
, (void __user
*)arg
, minsz
))
1722 if (unmap
.argsz
< minsz
|| unmap
.flags
)
1725 ret
= vfio_dma_do_unmap(iommu
, &unmap
);
1729 return copy_to_user((void __user
*)arg
, &unmap
, minsz
) ?
1736 static int vfio_iommu_type1_register_notifier(void *iommu_data
,
1737 unsigned long *events
,
1738 struct notifier_block
*nb
)
1740 struct vfio_iommu
*iommu
= iommu_data
;
1742 /* clear known events */
1743 *events
&= ~VFIO_IOMMU_NOTIFY_DMA_UNMAP
;
1745 /* refuse to register if still events remaining */
1749 return blocking_notifier_chain_register(&iommu
->notifier
, nb
);
1752 static int vfio_iommu_type1_unregister_notifier(void *iommu_data
,
1753 struct notifier_block
*nb
)
1755 struct vfio_iommu
*iommu
= iommu_data
;
1757 return blocking_notifier_chain_unregister(&iommu
->notifier
, nb
);
1760 static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1
= {
1761 .name
= "vfio-iommu-type1",
1762 .owner
= THIS_MODULE
,
1763 .open
= vfio_iommu_type1_open
,
1764 .release
= vfio_iommu_type1_release
,
1765 .ioctl
= vfio_iommu_type1_ioctl
,
1766 .attach_group
= vfio_iommu_type1_attach_group
,
1767 .detach_group
= vfio_iommu_type1_detach_group
,
1768 .pin_pages
= vfio_iommu_type1_pin_pages
,
1769 .unpin_pages
= vfio_iommu_type1_unpin_pages
,
1770 .register_notifier
= vfio_iommu_type1_register_notifier
,
1771 .unregister_notifier
= vfio_iommu_type1_unregister_notifier
,
1774 static int __init
vfio_iommu_type1_init(void)
1776 return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1
);
1779 static void __exit
vfio_iommu_type1_cleanup(void)
1781 vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1
);
1784 module_init(vfio_iommu_type1_init
);
1785 module_exit(vfio_iommu_type1_cleanup
);
1787 MODULE_VERSION(DRIVER_VERSION
);
1788 MODULE_LICENSE("GPL v2");
1789 MODULE_AUTHOR(DRIVER_AUTHOR
);
1790 MODULE_DESCRIPTION(DRIVER_DESC
);