2 * VFIO: IOMMU DMA mapping support for TCE on POWER
4 * Copyright (C) 2013 IBM Corp. All rights reserved.
5 * Author: Alexey Kardashevskiy <aik@ozlabs.ru>
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_iommu_type1.c:
12 * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
13 * Author: Alex Williamson <alex.williamson@redhat.com>
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/slab.h>
19 #include <linux/uaccess.h>
20 #include <linux/err.h>
21 #include <linux/vfio.h>
22 #include <linux/vmalloc.h>
23 #include <linux/sched/mm.h>
24 #include <linux/sched/signal.h>
26 #include <asm/iommu.h>
28 #include <asm/mmu_context.h>
30 #define DRIVER_VERSION "0.1"
31 #define DRIVER_AUTHOR "aik@ozlabs.ru"
32 #define DRIVER_DESC "VFIO IOMMU SPAPR TCE"
34 static void tce_iommu_detach_group(void *iommu_data
,
35 struct iommu_group
*iommu_group
);
37 static long try_increment_locked_vm(struct mm_struct
*mm
, long npages
)
39 long ret
= 0, locked
, lock_limit
;
41 if (WARN_ON_ONCE(!mm
))
47 down_write(&mm
->mmap_sem
);
48 locked
= mm
->locked_vm
+ npages
;
49 lock_limit
= rlimit(RLIMIT_MEMLOCK
) >> PAGE_SHIFT
;
50 if (locked
> lock_limit
&& !capable(CAP_IPC_LOCK
))
53 mm
->locked_vm
+= npages
;
55 pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current
->pid
,
57 mm
->locked_vm
<< PAGE_SHIFT
,
58 rlimit(RLIMIT_MEMLOCK
),
59 ret
? " - exceeded" : "");
61 up_write(&mm
->mmap_sem
);
66 static void decrement_locked_vm(struct mm_struct
*mm
, long npages
)
71 down_write(&mm
->mmap_sem
);
72 if (WARN_ON_ONCE(npages
> mm
->locked_vm
))
73 npages
= mm
->locked_vm
;
74 mm
->locked_vm
-= npages
;
75 pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current
->pid
,
77 mm
->locked_vm
<< PAGE_SHIFT
,
78 rlimit(RLIMIT_MEMLOCK
));
79 up_write(&mm
->mmap_sem
);
83 * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
85 * This code handles mapping and unmapping of user data buffers
86 * into DMA'ble space using the IOMMU
89 struct tce_iommu_group
{
90 struct list_head next
;
91 struct iommu_group
*grp
;
95 * A container needs to remember which preregistered region it has
96 * referenced to do proper cleanup at the userspace process exit.
98 struct tce_iommu_prereg
{
99 struct list_head next
;
100 struct mm_iommu_table_group_mem_t
*mem
;
104 * The container descriptor supports only a single group per container.
105 * Required by the API as the container is not supplied with the IOMMU group
106 * at the moment of initialization.
108 struct tce_container
{
112 bool def_window_pending
;
113 unsigned long locked_pages
;
114 struct mm_struct
*mm
;
115 struct iommu_table
*tables
[IOMMU_TABLE_GROUP_MAX_TABLES
];
116 struct list_head group_list
;
117 struct list_head prereg_list
;
120 static long tce_iommu_mm_set(struct tce_container
*container
)
123 if (container
->mm
== current
->mm
)
127 BUG_ON(!current
->mm
);
128 container
->mm
= current
->mm
;
129 atomic_inc(&container
->mm
->mm_count
);
134 static long tce_iommu_prereg_free(struct tce_container
*container
,
135 struct tce_iommu_prereg
*tcemem
)
139 ret
= mm_iommu_put(container
->mm
, tcemem
->mem
);
143 list_del(&tcemem
->next
);
149 static long tce_iommu_unregister_pages(struct tce_container
*container
,
150 __u64 vaddr
, __u64 size
)
152 struct mm_iommu_table_group_mem_t
*mem
;
153 struct tce_iommu_prereg
*tcemem
;
157 if ((vaddr
& ~PAGE_MASK
) || (size
& ~PAGE_MASK
))
160 mem
= mm_iommu_get(container
->mm
, vaddr
, size
>> PAGE_SHIFT
);
164 list_for_each_entry(tcemem
, &container
->prereg_list
, next
) {
165 if (tcemem
->mem
== mem
) {
174 ret
= tce_iommu_prereg_free(container
, tcemem
);
176 mm_iommu_put(container
->mm
, mem
);
181 static long tce_iommu_register_pages(struct tce_container
*container
,
182 __u64 vaddr
, __u64 size
)
185 struct mm_iommu_table_group_mem_t
*mem
= NULL
;
186 struct tce_iommu_prereg
*tcemem
;
187 unsigned long entries
= size
>> PAGE_SHIFT
;
189 if ((vaddr
& ~PAGE_MASK
) || (size
& ~PAGE_MASK
) ||
190 ((vaddr
+ size
) < vaddr
))
193 mem
= mm_iommu_get(container
->mm
, vaddr
, entries
);
195 list_for_each_entry(tcemem
, &container
->prereg_list
, next
) {
196 if (tcemem
->mem
== mem
) {
202 ret
= mm_iommu_new(container
->mm
, vaddr
, entries
, &mem
);
207 tcemem
= kzalloc(sizeof(*tcemem
), GFP_KERNEL
);
214 list_add(&tcemem
->next
, &container
->prereg_list
);
216 container
->enabled
= true;
221 mm_iommu_put(container
->mm
, mem
);
225 static bool tce_page_is_contained(struct mm_struct
*mm
, unsigned long hpa
,
226 unsigned int page_shift
)
229 unsigned long size
= 0;
231 if (mm_iommu_is_devmem(mm
, hpa
, page_shift
, &size
))
232 return size
== (1UL << page_shift
);
234 page
= pfn_to_page(hpa
>> PAGE_SHIFT
);
236 * Check that the TCE table granularity is not bigger than the size of
237 * a page we just found. Otherwise the hardware can get access to
238 * a bigger memory chunk that it should.
240 return (PAGE_SHIFT
+ compound_order(compound_head(page
))) >= page_shift
;
243 static inline bool tce_groups_attached(struct tce_container
*container
)
245 return !list_empty(&container
->group_list
);
248 static long tce_iommu_find_table(struct tce_container
*container
,
249 phys_addr_t ioba
, struct iommu_table
**ptbl
)
253 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
) {
254 struct iommu_table
*tbl
= container
->tables
[i
];
257 unsigned long entry
= ioba
>> tbl
->it_page_shift
;
258 unsigned long start
= tbl
->it_offset
;
259 unsigned long end
= start
+ tbl
->it_size
;
261 if ((start
<= entry
) && (entry
< end
)) {
271 static int tce_iommu_find_free_table(struct tce_container
*container
)
275 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
) {
276 if (!container
->tables
[i
])
283 static int tce_iommu_enable(struct tce_container
*container
)
286 unsigned long locked
;
287 struct iommu_table_group
*table_group
;
288 struct tce_iommu_group
*tcegrp
;
290 if (container
->enabled
)
294 * When userspace pages are mapped into the IOMMU, they are effectively
295 * locked memory, so, theoretically, we need to update the accounting
296 * of locked pages on each map and unmap. For powerpc, the map unmap
297 * paths can be very hot, though, and the accounting would kill
298 * performance, especially since it would be difficult to impossible
299 * to handle the accounting in real mode only.
301 * To address that, rather than precisely accounting every page, we
302 * instead account for a worst case on locked memory when the iommu is
303 * enabled and disabled. The worst case upper bound on locked memory
304 * is the size of the whole iommu window, which is usually relatively
305 * small (compared to total memory sizes) on POWER hardware.
307 * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
308 * that would effectively kill the guest at random points, much better
309 * enforcing the limit based on the max that the guest can map.
311 * Unfortunately at the moment it counts whole tables, no matter how
312 * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups
313 * each with 2GB DMA window, 8GB will be counted here. The reason for
314 * this is that we cannot tell here the amount of RAM used by the guest
315 * as this information is only available from KVM and VFIO is
318 * So we do not allow enabling a container without a group attached
319 * as there is no way to know how much we should increment
320 * the locked_vm counter.
322 if (!tce_groups_attached(container
))
325 tcegrp
= list_first_entry(&container
->group_list
,
326 struct tce_iommu_group
, next
);
327 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
331 if (!table_group
->tce32_size
)
334 ret
= tce_iommu_mm_set(container
);
338 locked
= table_group
->tce32_size
>> PAGE_SHIFT
;
339 ret
= try_increment_locked_vm(container
->mm
, locked
);
343 container
->locked_pages
= locked
;
345 container
->enabled
= true;
350 static void tce_iommu_disable(struct tce_container
*container
)
352 if (!container
->enabled
)
355 container
->enabled
= false;
357 BUG_ON(!container
->mm
);
358 decrement_locked_vm(container
->mm
, container
->locked_pages
);
361 static void *tce_iommu_open(unsigned long arg
)
363 struct tce_container
*container
;
365 if ((arg
!= VFIO_SPAPR_TCE_IOMMU
) && (arg
!= VFIO_SPAPR_TCE_v2_IOMMU
)) {
366 pr_err("tce_vfio: Wrong IOMMU type\n");
367 return ERR_PTR(-EINVAL
);
370 container
= kzalloc(sizeof(*container
), GFP_KERNEL
);
372 return ERR_PTR(-ENOMEM
);
374 mutex_init(&container
->lock
);
375 INIT_LIST_HEAD_RCU(&container
->group_list
);
376 INIT_LIST_HEAD_RCU(&container
->prereg_list
);
378 container
->v2
= arg
== VFIO_SPAPR_TCE_v2_IOMMU
;
383 static int tce_iommu_clear(struct tce_container
*container
,
384 struct iommu_table
*tbl
,
385 unsigned long entry
, unsigned long pages
);
386 static void tce_iommu_free_table(struct tce_container
*container
,
387 struct iommu_table
*tbl
);
389 static void tce_iommu_release(void *iommu_data
)
391 struct tce_container
*container
= iommu_data
;
392 struct tce_iommu_group
*tcegrp
;
393 struct tce_iommu_prereg
*tcemem
, *tmtmp
;
396 while (tce_groups_attached(container
)) {
397 tcegrp
= list_first_entry(&container
->group_list
,
398 struct tce_iommu_group
, next
);
399 tce_iommu_detach_group(iommu_data
, tcegrp
->grp
);
403 * If VFIO created a table, it was not disposed
404 * by tce_iommu_detach_group() so do it now.
406 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
) {
407 struct iommu_table
*tbl
= container
->tables
[i
];
412 tce_iommu_clear(container
, tbl
, tbl
->it_offset
, tbl
->it_size
);
413 tce_iommu_free_table(container
, tbl
);
416 list_for_each_entry_safe(tcemem
, tmtmp
, &container
->prereg_list
, next
)
417 WARN_ON(tce_iommu_prereg_free(container
, tcemem
));
419 tce_iommu_disable(container
);
421 mmdrop(container
->mm
);
422 mutex_destroy(&container
->lock
);
427 static void tce_iommu_unuse_page(struct tce_container
*container
,
432 page
= pfn_to_page(hpa
>> PAGE_SHIFT
);
436 static int tce_iommu_prereg_ua_to_hpa(struct tce_container
*container
,
437 unsigned long tce
, unsigned long shift
,
438 unsigned long *phpa
, struct mm_iommu_table_group_mem_t
**pmem
)
441 struct mm_iommu_table_group_mem_t
*mem
;
443 mem
= mm_iommu_lookup(container
->mm
, tce
, 1ULL << shift
);
447 ret
= mm_iommu_ua_to_hpa(mem
, tce
, shift
, phpa
);
456 static void tce_iommu_unuse_page_v2(struct tce_container
*container
,
457 struct iommu_table
*tbl
, unsigned long entry
)
459 struct mm_iommu_table_group_mem_t
*mem
= NULL
;
461 unsigned long hpa
= 0;
462 __be64
*pua
= IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl
, entry
);
467 ret
= tce_iommu_prereg_ua_to_hpa(container
, be64_to_cpu(*pua
),
468 tbl
->it_page_shift
, &hpa
, &mem
);
470 pr_debug("%s: tce %llx at #%lx was not cached, ret=%d\n",
471 __func__
, be64_to_cpu(*pua
), entry
, ret
);
473 mm_iommu_mapped_dec(mem
);
475 *pua
= cpu_to_be64(0);
478 static int tce_iommu_clear(struct tce_container
*container
,
479 struct iommu_table
*tbl
,
480 unsigned long entry
, unsigned long pages
)
482 unsigned long oldhpa
;
484 enum dma_data_direction direction
;
485 unsigned long lastentry
= entry
+ pages
;
487 for ( ; entry
< lastentry
; ++entry
) {
488 if (tbl
->it_indirect_levels
&& tbl
->it_userspace
) {
490 * For multilevel tables, we can take a shortcut here
491 * and skip some TCEs as we know that the userspace
492 * addresses cache is a mirror of the real TCE table
493 * and if it is missing some indirect levels, then
494 * the hardware table does not have them allocated
495 * either and therefore does not require updating.
497 __be64
*pua
= IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl
,
500 /* align to level_size which is power of two */
501 entry
|= tbl
->it_level_size
- 1;
508 direction
= DMA_NONE
;
510 ret
= iommu_tce_xchg(container
->mm
, tbl
, entry
, &oldhpa
,
515 if (direction
== DMA_NONE
)
519 tce_iommu_unuse_page_v2(container
, tbl
, entry
);
523 tce_iommu_unuse_page(container
, oldhpa
);
529 static int tce_iommu_use_page(unsigned long tce
, unsigned long *hpa
)
531 struct page
*page
= NULL
;
532 enum dma_data_direction direction
= iommu_tce_direction(tce
);
534 if (get_user_pages_fast(tce
& PAGE_MASK
, 1,
535 direction
!= DMA_TO_DEVICE
? FOLL_WRITE
: 0,
539 *hpa
= __pa((unsigned long) page_address(page
));
544 static long tce_iommu_build(struct tce_container
*container
,
545 struct iommu_table
*tbl
,
546 unsigned long entry
, unsigned long tce
, unsigned long pages
,
547 enum dma_data_direction direction
)
551 enum dma_data_direction dirtmp
;
553 for (i
= 0; i
< pages
; ++i
) {
554 unsigned long offset
= tce
& IOMMU_PAGE_MASK(tbl
) & ~PAGE_MASK
;
556 ret
= tce_iommu_use_page(tce
, &hpa
);
560 if (!tce_page_is_contained(container
->mm
, hpa
,
561 tbl
->it_page_shift
)) {
568 ret
= iommu_tce_xchg(container
->mm
, tbl
, entry
+ i
, &hpa
,
571 tce_iommu_unuse_page(container
, hpa
);
572 pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
573 __func__
, entry
<< tbl
->it_page_shift
,
578 if (dirtmp
!= DMA_NONE
)
579 tce_iommu_unuse_page(container
, hpa
);
581 tce
+= IOMMU_PAGE_SIZE(tbl
);
585 tce_iommu_clear(container
, tbl
, entry
, i
);
590 static long tce_iommu_build_v2(struct tce_container
*container
,
591 struct iommu_table
*tbl
,
592 unsigned long entry
, unsigned long tce
, unsigned long pages
,
593 enum dma_data_direction direction
)
597 enum dma_data_direction dirtmp
;
599 for (i
= 0; i
< pages
; ++i
) {
600 struct mm_iommu_table_group_mem_t
*mem
= NULL
;
601 __be64
*pua
= IOMMU_TABLE_USERSPACE_ENTRY(tbl
, entry
+ i
);
603 ret
= tce_iommu_prereg_ua_to_hpa(container
,
604 tce
, tbl
->it_page_shift
, &hpa
, &mem
);
608 if (!tce_page_is_contained(container
->mm
, hpa
,
609 tbl
->it_page_shift
)) {
614 /* Preserve offset within IOMMU page */
615 hpa
|= tce
& IOMMU_PAGE_MASK(tbl
) & ~PAGE_MASK
;
618 /* The registered region is being unregistered */
619 if (mm_iommu_mapped_inc(mem
))
622 ret
= iommu_tce_xchg(container
->mm
, tbl
, entry
+ i
, &hpa
,
625 /* dirtmp cannot be DMA_NONE here */
626 tce_iommu_unuse_page_v2(container
, tbl
, entry
+ i
);
627 pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n",
628 __func__
, entry
<< tbl
->it_page_shift
,
633 if (dirtmp
!= DMA_NONE
)
634 tce_iommu_unuse_page_v2(container
, tbl
, entry
+ i
);
636 *pua
= cpu_to_be64(tce
);
638 tce
+= IOMMU_PAGE_SIZE(tbl
);
642 tce_iommu_clear(container
, tbl
, entry
, i
);
647 static long tce_iommu_create_table(struct tce_container
*container
,
648 struct iommu_table_group
*table_group
,
653 struct iommu_table
**ptbl
)
655 long ret
, table_size
;
657 table_size
= table_group
->ops
->get_table_size(page_shift
, window_size
,
662 ret
= try_increment_locked_vm(container
->mm
, table_size
>> PAGE_SHIFT
);
666 ret
= table_group
->ops
->create_table(table_group
, num
,
667 page_shift
, window_size
, levels
, ptbl
);
669 WARN_ON(!ret
&& !(*ptbl
)->it_ops
->free
);
670 WARN_ON(!ret
&& ((*ptbl
)->it_allocated_size
> table_size
));
675 static void tce_iommu_free_table(struct tce_container
*container
,
676 struct iommu_table
*tbl
)
678 unsigned long pages
= tbl
->it_allocated_size
>> PAGE_SHIFT
;
680 iommu_tce_table_put(tbl
);
681 decrement_locked_vm(container
->mm
, pages
);
684 static long tce_iommu_create_window(struct tce_container
*container
,
685 __u32 page_shift
, __u64 window_size
, __u32 levels
,
688 struct tce_iommu_group
*tcegrp
;
689 struct iommu_table_group
*table_group
;
690 struct iommu_table
*tbl
= NULL
;
693 num
= tce_iommu_find_free_table(container
);
697 /* Get the first group for ops::create_table */
698 tcegrp
= list_first_entry(&container
->group_list
,
699 struct tce_iommu_group
, next
);
700 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
704 if (!(table_group
->pgsizes
& (1ULL << page_shift
)))
707 if (!table_group
->ops
->set_window
|| !table_group
->ops
->unset_window
||
708 !table_group
->ops
->get_table_size
||
709 !table_group
->ops
->create_table
)
712 /* Create TCE table */
713 ret
= tce_iommu_create_table(container
, table_group
, num
,
714 page_shift
, window_size
, levels
, &tbl
);
718 BUG_ON(!tbl
->it_ops
->free
);
721 * Program the table to every group.
722 * Groups have been tested for compatibility at the attach time.
724 list_for_each_entry(tcegrp
, &container
->group_list
, next
) {
725 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
727 ret
= table_group
->ops
->set_window(table_group
, num
, tbl
);
732 container
->tables
[num
] = tbl
;
734 /* Return start address assigned by platform in create_table() */
735 *start_addr
= tbl
->it_offset
<< tbl
->it_page_shift
;
740 list_for_each_entry(tcegrp
, &container
->group_list
, next
) {
741 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
742 table_group
->ops
->unset_window(table_group
, num
);
744 tce_iommu_free_table(container
, tbl
);
749 static long tce_iommu_remove_window(struct tce_container
*container
,
752 struct iommu_table_group
*table_group
= NULL
;
753 struct iommu_table
*tbl
;
754 struct tce_iommu_group
*tcegrp
;
757 num
= tce_iommu_find_table(container
, start_addr
, &tbl
);
761 BUG_ON(!tbl
->it_size
);
763 /* Detach groups from IOMMUs */
764 list_for_each_entry(tcegrp
, &container
->group_list
, next
) {
765 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
768 * SPAPR TCE IOMMU exposes the default DMA window to
769 * the guest via dma32_window_start/size of
770 * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow
771 * the userspace to remove this window, some do not so
772 * here we check for the platform capability.
774 if (!table_group
->ops
|| !table_group
->ops
->unset_window
)
777 table_group
->ops
->unset_window(table_group
, num
);
781 tce_iommu_clear(container
, tbl
, tbl
->it_offset
, tbl
->it_size
);
782 tce_iommu_free_table(container
, tbl
);
783 container
->tables
[num
] = NULL
;
788 static long tce_iommu_create_default_window(struct tce_container
*container
)
791 __u64 start_addr
= 0;
792 struct tce_iommu_group
*tcegrp
;
793 struct iommu_table_group
*table_group
;
795 if (!container
->def_window_pending
)
798 if (!tce_groups_attached(container
))
801 tcegrp
= list_first_entry(&container
->group_list
,
802 struct tce_iommu_group
, next
);
803 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
807 ret
= tce_iommu_create_window(container
, IOMMU_PAGE_SHIFT_4K
,
808 table_group
->tce32_size
, 1, &start_addr
);
809 WARN_ON_ONCE(!ret
&& start_addr
);
812 container
->def_window_pending
= false;
817 static long tce_iommu_ioctl(void *iommu_data
,
818 unsigned int cmd
, unsigned long arg
)
820 struct tce_container
*container
= iommu_data
;
821 unsigned long minsz
, ddwsz
;
825 case VFIO_CHECK_EXTENSION
:
827 case VFIO_SPAPR_TCE_IOMMU
:
828 case VFIO_SPAPR_TCE_v2_IOMMU
:
832 ret
= vfio_spapr_iommu_eeh_ioctl(NULL
, cmd
, arg
);
836 return (ret
< 0) ? 0 : ret
;
840 * Sanity check to prevent one userspace from manipulating
841 * another userspace mm.
844 if (container
->mm
&& container
->mm
!= current
->mm
)
848 case VFIO_IOMMU_SPAPR_TCE_GET_INFO
: {
849 struct vfio_iommu_spapr_tce_info info
;
850 struct tce_iommu_group
*tcegrp
;
851 struct iommu_table_group
*table_group
;
853 if (!tce_groups_attached(container
))
856 tcegrp
= list_first_entry(&container
->group_list
,
857 struct tce_iommu_group
, next
);
858 table_group
= iommu_group_get_iommudata(tcegrp
->grp
);
863 minsz
= offsetofend(struct vfio_iommu_spapr_tce_info
,
866 if (copy_from_user(&info
, (void __user
*)arg
, minsz
))
869 if (info
.argsz
< minsz
)
872 info
.dma32_window_start
= table_group
->tce32_start
;
873 info
.dma32_window_size
= table_group
->tce32_size
;
875 memset(&info
.ddw
, 0, sizeof(info
.ddw
));
877 if (table_group
->max_dynamic_windows_supported
&&
879 info
.flags
|= VFIO_IOMMU_SPAPR_INFO_DDW
;
880 info
.ddw
.pgsizes
= table_group
->pgsizes
;
881 info
.ddw
.max_dynamic_windows_supported
=
882 table_group
->max_dynamic_windows_supported
;
883 info
.ddw
.levels
= table_group
->max_levels
;
886 ddwsz
= offsetofend(struct vfio_iommu_spapr_tce_info
, ddw
);
888 if (info
.argsz
>= ddwsz
)
891 if (copy_to_user((void __user
*)arg
, &info
, minsz
))
896 case VFIO_IOMMU_MAP_DMA
: {
897 struct vfio_iommu_type1_dma_map param
;
898 struct iommu_table
*tbl
= NULL
;
900 enum dma_data_direction direction
;
902 if (!container
->enabled
)
905 minsz
= offsetofend(struct vfio_iommu_type1_dma_map
, size
);
907 if (copy_from_user(¶m
, (void __user
*)arg
, minsz
))
910 if (param
.argsz
< minsz
)
913 if (param
.flags
& ~(VFIO_DMA_MAP_FLAG_READ
|
914 VFIO_DMA_MAP_FLAG_WRITE
))
917 ret
= tce_iommu_create_default_window(container
);
921 num
= tce_iommu_find_table(container
, param
.iova
, &tbl
);
925 if ((param
.size
& ~IOMMU_PAGE_MASK(tbl
)) ||
926 (param
.vaddr
& ~IOMMU_PAGE_MASK(tbl
)))
929 /* iova is checked by the IOMMU API */
930 if (param
.flags
& VFIO_DMA_MAP_FLAG_READ
) {
931 if (param
.flags
& VFIO_DMA_MAP_FLAG_WRITE
)
932 direction
= DMA_BIDIRECTIONAL
;
934 direction
= DMA_TO_DEVICE
;
936 if (param
.flags
& VFIO_DMA_MAP_FLAG_WRITE
)
937 direction
= DMA_FROM_DEVICE
;
942 ret
= iommu_tce_put_param_check(tbl
, param
.iova
, param
.vaddr
);
947 ret
= tce_iommu_build_v2(container
, tbl
,
948 param
.iova
>> tbl
->it_page_shift
,
950 param
.size
>> tbl
->it_page_shift
,
953 ret
= tce_iommu_build(container
, tbl
,
954 param
.iova
>> tbl
->it_page_shift
,
956 param
.size
>> tbl
->it_page_shift
,
959 iommu_flush_tce(tbl
);
963 case VFIO_IOMMU_UNMAP_DMA
: {
964 struct vfio_iommu_type1_dma_unmap param
;
965 struct iommu_table
*tbl
= NULL
;
968 if (!container
->enabled
)
971 minsz
= offsetofend(struct vfio_iommu_type1_dma_unmap
,
974 if (copy_from_user(¶m
, (void __user
*)arg
, minsz
))
977 if (param
.argsz
< minsz
)
980 /* No flag is supported now */
984 ret
= tce_iommu_create_default_window(container
);
988 num
= tce_iommu_find_table(container
, param
.iova
, &tbl
);
992 if (param
.size
& ~IOMMU_PAGE_MASK(tbl
))
995 ret
= iommu_tce_clear_param_check(tbl
, param
.iova
, 0,
996 param
.size
>> tbl
->it_page_shift
);
1000 ret
= tce_iommu_clear(container
, tbl
,
1001 param
.iova
>> tbl
->it_page_shift
,
1002 param
.size
>> tbl
->it_page_shift
);
1003 iommu_flush_tce(tbl
);
1007 case VFIO_IOMMU_SPAPR_REGISTER_MEMORY
: {
1008 struct vfio_iommu_spapr_register_memory param
;
1013 minsz
= offsetofend(struct vfio_iommu_spapr_register_memory
,
1016 ret
= tce_iommu_mm_set(container
);
1020 if (copy_from_user(¶m
, (void __user
*)arg
, minsz
))
1023 if (param
.argsz
< minsz
)
1026 /* No flag is supported now */
1030 mutex_lock(&container
->lock
);
1031 ret
= tce_iommu_register_pages(container
, param
.vaddr
,
1033 mutex_unlock(&container
->lock
);
1037 case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY
: {
1038 struct vfio_iommu_spapr_register_memory param
;
1046 minsz
= offsetofend(struct vfio_iommu_spapr_register_memory
,
1049 if (copy_from_user(¶m
, (void __user
*)arg
, minsz
))
1052 if (param
.argsz
< minsz
)
1055 /* No flag is supported now */
1059 mutex_lock(&container
->lock
);
1060 ret
= tce_iommu_unregister_pages(container
, param
.vaddr
,
1062 mutex_unlock(&container
->lock
);
1066 case VFIO_IOMMU_ENABLE
:
1070 mutex_lock(&container
->lock
);
1071 ret
= tce_iommu_enable(container
);
1072 mutex_unlock(&container
->lock
);
1076 case VFIO_IOMMU_DISABLE
:
1080 mutex_lock(&container
->lock
);
1081 tce_iommu_disable(container
);
1082 mutex_unlock(&container
->lock
);
1085 case VFIO_EEH_PE_OP
: {
1086 struct tce_iommu_group
*tcegrp
;
1089 list_for_each_entry(tcegrp
, &container
->group_list
, next
) {
1090 ret
= vfio_spapr_iommu_eeh_ioctl(tcegrp
->grp
,
1098 case VFIO_IOMMU_SPAPR_TCE_CREATE
: {
1099 struct vfio_iommu_spapr_tce_create create
;
1104 ret
= tce_iommu_mm_set(container
);
1108 if (!tce_groups_attached(container
))
1111 minsz
= offsetofend(struct vfio_iommu_spapr_tce_create
,
1114 if (copy_from_user(&create
, (void __user
*)arg
, minsz
))
1117 if (create
.argsz
< minsz
)
1123 mutex_lock(&container
->lock
);
1125 ret
= tce_iommu_create_default_window(container
);
1127 ret
= tce_iommu_create_window(container
,
1129 create
.window_size
, create
.levels
,
1130 &create
.start_addr
);
1132 mutex_unlock(&container
->lock
);
1134 if (!ret
&& copy_to_user((void __user
*)arg
, &create
, minsz
))
1139 case VFIO_IOMMU_SPAPR_TCE_REMOVE
: {
1140 struct vfio_iommu_spapr_tce_remove remove
;
1145 ret
= tce_iommu_mm_set(container
);
1149 if (!tce_groups_attached(container
))
1152 minsz
= offsetofend(struct vfio_iommu_spapr_tce_remove
,
1155 if (copy_from_user(&remove
, (void __user
*)arg
, minsz
))
1158 if (remove
.argsz
< minsz
)
1164 if (container
->def_window_pending
&& !remove
.start_addr
) {
1165 container
->def_window_pending
= false;
1169 mutex_lock(&container
->lock
);
1171 ret
= tce_iommu_remove_window(container
, remove
.start_addr
);
1173 mutex_unlock(&container
->lock
);
1182 static void tce_iommu_release_ownership(struct tce_container
*container
,
1183 struct iommu_table_group
*table_group
)
1187 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
) {
1188 struct iommu_table
*tbl
= container
->tables
[i
];
1193 tce_iommu_clear(container
, tbl
, tbl
->it_offset
, tbl
->it_size
);
1195 iommu_release_ownership(tbl
);
1197 container
->tables
[i
] = NULL
;
1201 static int tce_iommu_take_ownership(struct tce_container
*container
,
1202 struct iommu_table_group
*table_group
)
1206 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
) {
1207 struct iommu_table
*tbl
= table_group
->tables
[i
];
1209 if (!tbl
|| !tbl
->it_map
)
1212 rc
= iommu_take_ownership(tbl
);
1214 for (j
= 0; j
< i
; ++j
)
1215 iommu_release_ownership(
1216 table_group
->tables
[j
]);
1222 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
)
1223 container
->tables
[i
] = table_group
->tables
[i
];
1228 static void tce_iommu_release_ownership_ddw(struct tce_container
*container
,
1229 struct iommu_table_group
*table_group
)
1233 if (!table_group
->ops
->unset_window
) {
1238 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
)
1239 if (container
->tables
[i
])
1240 table_group
->ops
->unset_window(table_group
, i
);
1242 table_group
->ops
->release_ownership(table_group
);
1245 static long tce_iommu_take_ownership_ddw(struct tce_container
*container
,
1246 struct iommu_table_group
*table_group
)
1250 if (!table_group
->ops
->create_table
|| !table_group
->ops
->set_window
||
1251 !table_group
->ops
->release_ownership
) {
1256 table_group
->ops
->take_ownership(table_group
);
1258 /* Set all windows to the new group */
1259 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
) {
1260 struct iommu_table
*tbl
= container
->tables
[i
];
1265 ret
= table_group
->ops
->set_window(table_group
, i
, tbl
);
1273 for (i
= 0; i
< IOMMU_TABLE_GROUP_MAX_TABLES
; ++i
)
1274 table_group
->ops
->unset_window(table_group
, i
);
1276 table_group
->ops
->release_ownership(table_group
);
1281 static int tce_iommu_attach_group(void *iommu_data
,
1282 struct iommu_group
*iommu_group
)
1285 struct tce_container
*container
= iommu_data
;
1286 struct iommu_table_group
*table_group
;
1287 struct tce_iommu_group
*tcegrp
= NULL
;
1289 mutex_lock(&container
->lock
);
1291 /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
1292 iommu_group_id(iommu_group), iommu_group); */
1293 table_group
= iommu_group_get_iommudata(iommu_group
);
1299 if (tce_groups_attached(container
) && (!table_group
->ops
||
1300 !table_group
->ops
->take_ownership
||
1301 !table_group
->ops
->release_ownership
)) {
1306 /* Check if new group has the same iommu_ops (i.e. compatible) */
1307 list_for_each_entry(tcegrp
, &container
->group_list
, next
) {
1308 struct iommu_table_group
*table_group_tmp
;
1310 if (tcegrp
->grp
== iommu_group
) {
1311 pr_warn("tce_vfio: Group %d is already attached\n",
1312 iommu_group_id(iommu_group
));
1316 table_group_tmp
= iommu_group_get_iommudata(tcegrp
->grp
);
1317 if (table_group_tmp
->ops
->create_table
!=
1318 table_group
->ops
->create_table
) {
1319 pr_warn("tce_vfio: Group %d is incompatible with group %d\n",
1320 iommu_group_id(iommu_group
),
1321 iommu_group_id(tcegrp
->grp
));
1327 tcegrp
= kzalloc(sizeof(*tcegrp
), GFP_KERNEL
);
1333 if (!table_group
->ops
|| !table_group
->ops
->take_ownership
||
1334 !table_group
->ops
->release_ownership
) {
1335 if (container
->v2
) {
1339 ret
= tce_iommu_take_ownership(container
, table_group
);
1341 if (!container
->v2
) {
1345 ret
= tce_iommu_take_ownership_ddw(container
, table_group
);
1346 if (!tce_groups_attached(container
) && !container
->tables
[0])
1347 container
->def_window_pending
= true;
1351 tcegrp
->grp
= iommu_group
;
1352 list_add(&tcegrp
->next
, &container
->group_list
);
1359 mutex_unlock(&container
->lock
);
1364 static void tce_iommu_detach_group(void *iommu_data
,
1365 struct iommu_group
*iommu_group
)
1367 struct tce_container
*container
= iommu_data
;
1368 struct iommu_table_group
*table_group
;
1370 struct tce_iommu_group
*tcegrp
;
1372 mutex_lock(&container
->lock
);
1374 list_for_each_entry(tcegrp
, &container
->group_list
, next
) {
1375 if (tcegrp
->grp
== iommu_group
) {
1382 pr_warn("tce_vfio: detaching unattached group #%u\n",
1383 iommu_group_id(iommu_group
));
1387 list_del(&tcegrp
->next
);
1390 table_group
= iommu_group_get_iommudata(iommu_group
);
1391 BUG_ON(!table_group
);
1393 if (!table_group
->ops
|| !table_group
->ops
->release_ownership
)
1394 tce_iommu_release_ownership(container
, table_group
);
1396 tce_iommu_release_ownership_ddw(container
, table_group
);
1399 mutex_unlock(&container
->lock
);
1402 static const struct vfio_iommu_driver_ops tce_iommu_driver_ops
= {
1403 .name
= "iommu-vfio-powerpc",
1404 .owner
= THIS_MODULE
,
1405 .open
= tce_iommu_open
,
1406 .release
= tce_iommu_release
,
1407 .ioctl
= tce_iommu_ioctl
,
1408 .attach_group
= tce_iommu_attach_group
,
1409 .detach_group
= tce_iommu_detach_group
,
1412 static int __init
tce_iommu_init(void)
1414 return vfio_register_iommu_driver(&tce_iommu_driver_ops
);
1417 static void __exit
tce_iommu_cleanup(void)
1419 vfio_unregister_iommu_driver(&tce_iommu_driver_ops
);
1422 module_init(tce_iommu_init
);
1423 module_exit(tce_iommu_cleanup
);
1425 MODULE_VERSION(DRIVER_VERSION
);
1426 MODULE_LICENSE("GPL v2");
1427 MODULE_AUTHOR(DRIVER_AUTHOR
);
1428 MODULE_DESCRIPTION(DRIVER_DESC
);