2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
4 * Leo Duran <leo.duran@amd.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/pci.h>
21 #include <linux/gfp.h>
22 #include <linux/bitops.h>
23 #include <linux/debugfs.h>
24 #include <linux/scatterlist.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/iommu-helper.h>
27 #include <linux/iommu.h>
28 #include <asm/proto.h>
29 #include <asm/iommu.h>
31 #include <asm/amd_iommu_types.h>
32 #include <asm/amd_iommu.h>
34 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
36 #define EXIT_LOOP_COUNT 10000000
38 static DEFINE_RWLOCK(amd_iommu_devtable_lock
);
40 /* A list of preallocated protection domains */
41 static LIST_HEAD(iommu_pd_list
);
42 static DEFINE_SPINLOCK(iommu_pd_list_lock
);
44 #ifdef CONFIG_IOMMU_API
45 static struct iommu_ops amd_iommu_ops
;
49 * general struct to manage commands send to an IOMMU
55 static int dma_ops_unity_map(struct dma_ops_domain
*dma_dom
,
56 struct unity_map_entry
*e
);
57 static struct dma_ops_domain
*find_protection_domain(u16 devid
);
58 static u64
* alloc_pte(struct protection_domain
*dom
,
59 unsigned long address
, u64
60 **pte_page
, gfp_t gfp
);
61 static void dma_ops_reserve_addresses(struct dma_ops_domain
*dom
,
62 unsigned long start_page
,
65 #ifdef CONFIG_AMD_IOMMU_STATS
68 * Initialization code for statistics collection
71 DECLARE_STATS_COUNTER(compl_wait
);
72 DECLARE_STATS_COUNTER(cnt_map_single
);
73 DECLARE_STATS_COUNTER(cnt_unmap_single
);
74 DECLARE_STATS_COUNTER(cnt_map_sg
);
75 DECLARE_STATS_COUNTER(cnt_unmap_sg
);
76 DECLARE_STATS_COUNTER(cnt_alloc_coherent
);
77 DECLARE_STATS_COUNTER(cnt_free_coherent
);
78 DECLARE_STATS_COUNTER(cross_page
);
79 DECLARE_STATS_COUNTER(domain_flush_single
);
80 DECLARE_STATS_COUNTER(domain_flush_all
);
81 DECLARE_STATS_COUNTER(alloced_io_mem
);
82 DECLARE_STATS_COUNTER(total_map_requests
);
84 static struct dentry
*stats_dir
;
85 static struct dentry
*de_isolate
;
86 static struct dentry
*de_fflush
;
88 static void amd_iommu_stats_add(struct __iommu_counter
*cnt
)
90 if (stats_dir
== NULL
)
93 cnt
->dent
= debugfs_create_u64(cnt
->name
, 0444, stats_dir
,
97 static void amd_iommu_stats_init(void)
99 stats_dir
= debugfs_create_dir("amd-iommu", NULL
);
100 if (stats_dir
== NULL
)
103 de_isolate
= debugfs_create_bool("isolation", 0444, stats_dir
,
104 (u32
*)&amd_iommu_isolate
);
106 de_fflush
= debugfs_create_bool("fullflush", 0444, stats_dir
,
107 (u32
*)&amd_iommu_unmap_flush
);
109 amd_iommu_stats_add(&compl_wait
);
110 amd_iommu_stats_add(&cnt_map_single
);
111 amd_iommu_stats_add(&cnt_unmap_single
);
112 amd_iommu_stats_add(&cnt_map_sg
);
113 amd_iommu_stats_add(&cnt_unmap_sg
);
114 amd_iommu_stats_add(&cnt_alloc_coherent
);
115 amd_iommu_stats_add(&cnt_free_coherent
);
116 amd_iommu_stats_add(&cross_page
);
117 amd_iommu_stats_add(&domain_flush_single
);
118 amd_iommu_stats_add(&domain_flush_all
);
119 amd_iommu_stats_add(&alloced_io_mem
);
120 amd_iommu_stats_add(&total_map_requests
);
125 /* returns !0 if the IOMMU is caching non-present entries in its TLB */
126 static int iommu_has_npcache(struct amd_iommu
*iommu
)
128 return iommu
->cap
& (1UL << IOMMU_CAP_NPCACHE
);
131 /****************************************************************************
133 * Interrupt handling functions
135 ****************************************************************************/
137 static void iommu_print_event(void *__evt
)
140 int type
= (event
[1] >> EVENT_TYPE_SHIFT
) & EVENT_TYPE_MASK
;
141 int devid
= (event
[0] >> EVENT_DEVID_SHIFT
) & EVENT_DEVID_MASK
;
142 int domid
= (event
[1] >> EVENT_DOMID_SHIFT
) & EVENT_DOMID_MASK
;
143 int flags
= (event
[1] >> EVENT_FLAGS_SHIFT
) & EVENT_FLAGS_MASK
;
144 u64 address
= (u64
)(((u64
)event
[3]) << 32) | event
[2];
146 printk(KERN_ERR
"AMD IOMMU: Event logged [");
149 case EVENT_TYPE_ILL_DEV
:
150 printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x "
151 "address=0x%016llx flags=0x%04x]\n",
152 PCI_BUS(devid
), PCI_SLOT(devid
), PCI_FUNC(devid
),
155 case EVENT_TYPE_IO_FAULT
:
156 printk("IO_PAGE_FAULT device=%02x:%02x.%x "
157 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
158 PCI_BUS(devid
), PCI_SLOT(devid
), PCI_FUNC(devid
),
159 domid
, address
, flags
);
161 case EVENT_TYPE_DEV_TAB_ERR
:
162 printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
163 "address=0x%016llx flags=0x%04x]\n",
164 PCI_BUS(devid
), PCI_SLOT(devid
), PCI_FUNC(devid
),
167 case EVENT_TYPE_PAGE_TAB_ERR
:
168 printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
169 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
170 PCI_BUS(devid
), PCI_SLOT(devid
), PCI_FUNC(devid
),
171 domid
, address
, flags
);
173 case EVENT_TYPE_ILL_CMD
:
174 printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address
);
176 case EVENT_TYPE_CMD_HARD_ERR
:
177 printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
178 "flags=0x%04x]\n", address
, flags
);
180 case EVENT_TYPE_IOTLB_INV_TO
:
181 printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
182 "address=0x%016llx]\n",
183 PCI_BUS(devid
), PCI_SLOT(devid
), PCI_FUNC(devid
),
186 case EVENT_TYPE_INV_DEV_REQ
:
187 printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x "
188 "address=0x%016llx flags=0x%04x]\n",
189 PCI_BUS(devid
), PCI_SLOT(devid
), PCI_FUNC(devid
),
193 printk(KERN_ERR
"UNKNOWN type=0x%02x]\n", type
);
197 static void iommu_poll_events(struct amd_iommu
*iommu
)
202 spin_lock_irqsave(&iommu
->lock
, flags
);
204 head
= readl(iommu
->mmio_base
+ MMIO_EVT_HEAD_OFFSET
);
205 tail
= readl(iommu
->mmio_base
+ MMIO_EVT_TAIL_OFFSET
);
207 while (head
!= tail
) {
208 iommu_print_event(iommu
->evt_buf
+ head
);
209 head
= (head
+ EVENT_ENTRY_SIZE
) % iommu
->evt_buf_size
;
212 writel(head
, iommu
->mmio_base
+ MMIO_EVT_HEAD_OFFSET
);
214 spin_unlock_irqrestore(&iommu
->lock
, flags
);
217 irqreturn_t
amd_iommu_int_handler(int irq
, void *data
)
219 struct amd_iommu
*iommu
;
221 list_for_each_entry(iommu
, &amd_iommu_list
, list
)
222 iommu_poll_events(iommu
);
227 /****************************************************************************
229 * IOMMU command queuing functions
231 ****************************************************************************/
234 * Writes the command to the IOMMUs command buffer and informs the
235 * hardware about the new command. Must be called with iommu->lock held.
237 static int __iommu_queue_command(struct amd_iommu
*iommu
, struct iommu_cmd
*cmd
)
242 tail
= readl(iommu
->mmio_base
+ MMIO_CMD_TAIL_OFFSET
);
243 target
= iommu
->cmd_buf
+ tail
;
244 memcpy_toio(target
, cmd
, sizeof(*cmd
));
245 tail
= (tail
+ sizeof(*cmd
)) % iommu
->cmd_buf_size
;
246 head
= readl(iommu
->mmio_base
+ MMIO_CMD_HEAD_OFFSET
);
249 writel(tail
, iommu
->mmio_base
+ MMIO_CMD_TAIL_OFFSET
);
255 * General queuing function for commands. Takes iommu->lock and calls
256 * __iommu_queue_command().
258 static int iommu_queue_command(struct amd_iommu
*iommu
, struct iommu_cmd
*cmd
)
263 spin_lock_irqsave(&iommu
->lock
, flags
);
264 ret
= __iommu_queue_command(iommu
, cmd
);
266 iommu
->need_sync
= true;
267 spin_unlock_irqrestore(&iommu
->lock
, flags
);
273 * This function waits until an IOMMU has completed a completion
276 static void __iommu_wait_for_completion(struct amd_iommu
*iommu
)
282 INC_STATS_COUNTER(compl_wait
);
284 while (!ready
&& (i
< EXIT_LOOP_COUNT
)) {
286 /* wait for the bit to become one */
287 status
= readl(iommu
->mmio_base
+ MMIO_STATUS_OFFSET
);
288 ready
= status
& MMIO_STATUS_COM_WAIT_INT_MASK
;
291 /* set bit back to zero */
292 status
&= ~MMIO_STATUS_COM_WAIT_INT_MASK
;
293 writel(status
, iommu
->mmio_base
+ MMIO_STATUS_OFFSET
);
295 if (unlikely(i
== EXIT_LOOP_COUNT
))
296 panic("AMD IOMMU: Completion wait loop failed\n");
300 * This function queues a completion wait command into the command
303 static int __iommu_completion_wait(struct amd_iommu
*iommu
)
305 struct iommu_cmd cmd
;
307 memset(&cmd
, 0, sizeof(cmd
));
308 cmd
.data
[0] = CMD_COMPL_WAIT_INT_MASK
;
309 CMD_SET_TYPE(&cmd
, CMD_COMPL_WAIT
);
311 return __iommu_queue_command(iommu
, &cmd
);
315 * This function is called whenever we need to ensure that the IOMMU has
316 * completed execution of all commands we sent. It sends a
317 * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs
318 * us about that by writing a value to a physical address we pass with
321 static int iommu_completion_wait(struct amd_iommu
*iommu
)
326 spin_lock_irqsave(&iommu
->lock
, flags
);
328 if (!iommu
->need_sync
)
331 ret
= __iommu_completion_wait(iommu
);
333 iommu
->need_sync
= false;
338 __iommu_wait_for_completion(iommu
);
341 spin_unlock_irqrestore(&iommu
->lock
, flags
);
347 * Command send function for invalidating a device table entry
349 static int iommu_queue_inv_dev_entry(struct amd_iommu
*iommu
, u16 devid
)
351 struct iommu_cmd cmd
;
354 BUG_ON(iommu
== NULL
);
356 memset(&cmd
, 0, sizeof(cmd
));
357 CMD_SET_TYPE(&cmd
, CMD_INV_DEV_ENTRY
);
360 ret
= iommu_queue_command(iommu
, &cmd
);
365 static void __iommu_build_inv_iommu_pages(struct iommu_cmd
*cmd
, u64 address
,
366 u16 domid
, int pde
, int s
)
368 memset(cmd
, 0, sizeof(*cmd
));
369 address
&= PAGE_MASK
;
370 CMD_SET_TYPE(cmd
, CMD_INV_IOMMU_PAGES
);
371 cmd
->data
[1] |= domid
;
372 cmd
->data
[2] = lower_32_bits(address
);
373 cmd
->data
[3] = upper_32_bits(address
);
374 if (s
) /* size bit - we flush more than one 4kb page */
375 cmd
->data
[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK
;
376 if (pde
) /* PDE bit - we wan't flush everything not only the PTEs */
377 cmd
->data
[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK
;
381 * Generic command send function for invalidaing TLB entries
383 static int iommu_queue_inv_iommu_pages(struct amd_iommu
*iommu
,
384 u64 address
, u16 domid
, int pde
, int s
)
386 struct iommu_cmd cmd
;
389 __iommu_build_inv_iommu_pages(&cmd
, address
, domid
, pde
, s
);
391 ret
= iommu_queue_command(iommu
, &cmd
);
397 * TLB invalidation function which is called from the mapping functions.
398 * It invalidates a single PTE if the range to flush is within a single
399 * page. Otherwise it flushes the whole TLB of the IOMMU.
401 static int iommu_flush_pages(struct amd_iommu
*iommu
, u16 domid
,
402 u64 address
, size_t size
)
405 unsigned pages
= iommu_num_pages(address
, size
, PAGE_SIZE
);
407 address
&= PAGE_MASK
;
411 * If we have to flush more than one page, flush all
412 * TLB entries for this domain
414 address
= CMD_INV_IOMMU_ALL_PAGES_ADDRESS
;
418 iommu_queue_inv_iommu_pages(iommu
, address
, domid
, 0, s
);
423 /* Flush the whole IO/TLB for a given protection domain */
424 static void iommu_flush_tlb(struct amd_iommu
*iommu
, u16 domid
)
426 u64 address
= CMD_INV_IOMMU_ALL_PAGES_ADDRESS
;
428 INC_STATS_COUNTER(domain_flush_single
);
430 iommu_queue_inv_iommu_pages(iommu
, address
, domid
, 0, 1);
434 * This function is used to flush the IO/TLB for a given protection domain
435 * on every IOMMU in the system
437 static void iommu_flush_domain(u16 domid
)
440 struct amd_iommu
*iommu
;
441 struct iommu_cmd cmd
;
443 INC_STATS_COUNTER(domain_flush_all
);
445 __iommu_build_inv_iommu_pages(&cmd
, CMD_INV_IOMMU_ALL_PAGES_ADDRESS
,
448 list_for_each_entry(iommu
, &amd_iommu_list
, list
) {
449 spin_lock_irqsave(&iommu
->lock
, flags
);
450 __iommu_queue_command(iommu
, &cmd
);
451 __iommu_completion_wait(iommu
);
452 __iommu_wait_for_completion(iommu
);
453 spin_unlock_irqrestore(&iommu
->lock
, flags
);
457 /****************************************************************************
459 * The functions below are used the create the page table mappings for
460 * unity mapped regions.
462 ****************************************************************************/
465 * Generic mapping functions. It maps a physical address into a DMA
466 * address space. It allocates the page table pages if necessary.
467 * In the future it can be extended to a generic mapping function
468 * supporting all features of AMD IOMMU page tables like level skipping
469 * and full 64 bit address spaces.
471 static int iommu_map_page(struct protection_domain
*dom
,
472 unsigned long bus_addr
,
473 unsigned long phys_addr
,
478 bus_addr
= PAGE_ALIGN(bus_addr
);
479 phys_addr
= PAGE_ALIGN(phys_addr
);
481 /* only support 512GB address spaces for now */
482 if (bus_addr
> IOMMU_MAP_SIZE_L3
|| !(prot
& IOMMU_PROT_MASK
))
485 pte
= alloc_pte(dom
, bus_addr
, NULL
, GFP_KERNEL
);
487 if (IOMMU_PTE_PRESENT(*pte
))
490 __pte
= phys_addr
| IOMMU_PTE_P
;
491 if (prot
& IOMMU_PROT_IR
)
492 __pte
|= IOMMU_PTE_IR
;
493 if (prot
& IOMMU_PROT_IW
)
494 __pte
|= IOMMU_PTE_IW
;
501 static void iommu_unmap_page(struct protection_domain
*dom
,
502 unsigned long bus_addr
)
506 pte
= &dom
->pt_root
[IOMMU_PTE_L2_INDEX(bus_addr
)];
508 if (!IOMMU_PTE_PRESENT(*pte
))
511 pte
= IOMMU_PTE_PAGE(*pte
);
512 pte
= &pte
[IOMMU_PTE_L1_INDEX(bus_addr
)];
514 if (!IOMMU_PTE_PRESENT(*pte
))
517 pte
= IOMMU_PTE_PAGE(*pte
);
518 pte
= &pte
[IOMMU_PTE_L1_INDEX(bus_addr
)];
524 * This function checks if a specific unity mapping entry is needed for
525 * this specific IOMMU.
527 static int iommu_for_unity_map(struct amd_iommu
*iommu
,
528 struct unity_map_entry
*entry
)
532 for (i
= entry
->devid_start
; i
<= entry
->devid_end
; ++i
) {
533 bdf
= amd_iommu_alias_table
[i
];
534 if (amd_iommu_rlookup_table
[bdf
] == iommu
)
542 * Init the unity mappings for a specific IOMMU in the system
544 * Basically iterates over all unity mapping entries and applies them to
545 * the default domain DMA of that IOMMU if necessary.
547 static int iommu_init_unity_mappings(struct amd_iommu
*iommu
)
549 struct unity_map_entry
*entry
;
552 list_for_each_entry(entry
, &amd_iommu_unity_map
, list
) {
553 if (!iommu_for_unity_map(iommu
, entry
))
555 ret
= dma_ops_unity_map(iommu
->default_dom
, entry
);
564 * This function actually applies the mapping to the page table of the
567 static int dma_ops_unity_map(struct dma_ops_domain
*dma_dom
,
568 struct unity_map_entry
*e
)
573 for (addr
= e
->address_start
; addr
< e
->address_end
;
575 ret
= iommu_map_page(&dma_dom
->domain
, addr
, addr
, e
->prot
);
579 * if unity mapping is in aperture range mark the page
580 * as allocated in the aperture
582 if (addr
< dma_dom
->aperture_size
)
583 __set_bit(addr
>> PAGE_SHIFT
,
584 dma_dom
->aperture
[0]->bitmap
);
591 * Inits the unity mappings required for a specific device
593 static int init_unity_mappings_for_device(struct dma_ops_domain
*dma_dom
,
596 struct unity_map_entry
*e
;
599 list_for_each_entry(e
, &amd_iommu_unity_map
, list
) {
600 if (!(devid
>= e
->devid_start
&& devid
<= e
->devid_end
))
602 ret
= dma_ops_unity_map(dma_dom
, e
);
610 /****************************************************************************
612 * The next functions belong to the address allocator for the dma_ops
613 * interface functions. They work like the allocators in the other IOMMU
614 * drivers. Its basically a bitmap which marks the allocated pages in
615 * the aperture. Maybe it could be enhanced in the future to a more
616 * efficient allocator.
618 ****************************************************************************/
621 * The address allocator core functions.
623 * called with domain->lock held
627 * This function checks if there is a PTE for a given dma address. If
628 * there is one, it returns the pointer to it.
630 static u64
* fetch_pte(struct protection_domain
*domain
,
631 unsigned long address
)
635 pte
= &domain
->pt_root
[IOMMU_PTE_L2_INDEX(address
)];
637 if (!IOMMU_PTE_PRESENT(*pte
))
640 pte
= IOMMU_PTE_PAGE(*pte
);
641 pte
= &pte
[IOMMU_PTE_L1_INDEX(address
)];
643 if (!IOMMU_PTE_PRESENT(*pte
))
646 pte
= IOMMU_PTE_PAGE(*pte
);
647 pte
= &pte
[IOMMU_PTE_L0_INDEX(address
)];
653 * This function is used to add a new aperture range to an existing
654 * aperture in case of dma_ops domain allocation or address allocation
657 static int alloc_new_range(struct amd_iommu
*iommu
,
658 struct dma_ops_domain
*dma_dom
,
659 bool populate
, gfp_t gfp
)
661 int index
= dma_dom
->aperture_size
>> APERTURE_RANGE_SHIFT
;
664 if (index
>= APERTURE_MAX_RANGES
)
667 dma_dom
->aperture
[index
] = kzalloc(sizeof(struct aperture_range
), gfp
);
668 if (!dma_dom
->aperture
[index
])
671 dma_dom
->aperture
[index
]->bitmap
= (void *)get_zeroed_page(gfp
);
672 if (!dma_dom
->aperture
[index
]->bitmap
)
675 dma_dom
->aperture
[index
]->offset
= dma_dom
->aperture_size
;
678 unsigned long address
= dma_dom
->aperture_size
;
679 int i
, num_ptes
= APERTURE_RANGE_PAGES
/ 512;
682 for (i
= 0; i
< num_ptes
; ++i
) {
683 pte
= alloc_pte(&dma_dom
->domain
, address
,
688 dma_dom
->aperture
[index
]->pte_pages
[i
] = pte_page
;
690 address
+= APERTURE_RANGE_SIZE
/ 64;
694 dma_dom
->aperture_size
+= APERTURE_RANGE_SIZE
;
696 /* Intialize the exclusion range if necessary */
697 if (iommu
->exclusion_start
&&
698 iommu
->exclusion_start
>= dma_dom
->aperture
[index
]->offset
&&
699 iommu
->exclusion_start
< dma_dom
->aperture_size
) {
700 unsigned long startpage
= iommu
->exclusion_start
>> PAGE_SHIFT
;
701 int pages
= iommu_num_pages(iommu
->exclusion_start
,
702 iommu
->exclusion_length
,
704 dma_ops_reserve_addresses(dma_dom
, startpage
, pages
);
708 * Check for areas already mapped as present in the new aperture
709 * range and mark those pages as reserved in the allocator. Such
710 * mappings may already exist as a result of requested unity
711 * mappings for devices.
713 for (i
= dma_dom
->aperture
[index
]->offset
;
714 i
< dma_dom
->aperture_size
;
716 u64
*pte
= fetch_pte(&dma_dom
->domain
, i
);
717 if (!pte
|| !IOMMU_PTE_PRESENT(*pte
))
720 dma_ops_reserve_addresses(dma_dom
, i
<< PAGE_SHIFT
, 1);
726 free_page((unsigned long)dma_dom
->aperture
[index
]->bitmap
);
728 kfree(dma_dom
->aperture
[index
]);
729 dma_dom
->aperture
[index
] = NULL
;
734 static unsigned long dma_ops_area_alloc(struct device
*dev
,
735 struct dma_ops_domain
*dom
,
737 unsigned long align_mask
,
741 unsigned long next_bit
= dom
->next_address
% APERTURE_RANGE_SIZE
;
742 int max_index
= dom
->aperture_size
>> APERTURE_RANGE_SHIFT
;
743 int i
= start
>> APERTURE_RANGE_SHIFT
;
744 unsigned long boundary_size
;
745 unsigned long address
= -1;
748 next_bit
>>= PAGE_SHIFT
;
750 boundary_size
= ALIGN(dma_get_seg_boundary(dev
) + 1,
751 PAGE_SIZE
) >> PAGE_SHIFT
;
753 for (;i
< max_index
; ++i
) {
754 unsigned long offset
= dom
->aperture
[i
]->offset
>> PAGE_SHIFT
;
756 if (dom
->aperture
[i
]->offset
>= dma_mask
)
759 limit
= iommu_device_max_index(APERTURE_RANGE_PAGES
, offset
,
760 dma_mask
>> PAGE_SHIFT
);
762 address
= iommu_area_alloc(dom
->aperture
[i
]->bitmap
,
763 limit
, next_bit
, pages
, 0,
764 boundary_size
, align_mask
);
766 address
= dom
->aperture
[i
]->offset
+
767 (address
<< PAGE_SHIFT
);
768 dom
->next_address
= address
+ (pages
<< PAGE_SHIFT
);
778 static unsigned long dma_ops_alloc_addresses(struct device
*dev
,
779 struct dma_ops_domain
*dom
,
781 unsigned long align_mask
,
784 unsigned long address
;
786 #ifdef CONFIG_IOMMU_STRESS
787 dom
->next_address
= 0;
788 dom
->need_flush
= true;
791 address
= dma_ops_area_alloc(dev
, dom
, pages
, align_mask
,
792 dma_mask
, dom
->next_address
);
795 dom
->next_address
= 0;
796 address
= dma_ops_area_alloc(dev
, dom
, pages
, align_mask
,
798 dom
->need_flush
= true;
801 if (unlikely(address
== -1))
802 address
= bad_dma_address
;
804 WARN_ON((address
+ (PAGE_SIZE
*pages
)) > dom
->aperture_size
);
810 * The address free function.
812 * called with domain->lock held
814 static void dma_ops_free_addresses(struct dma_ops_domain
*dom
,
815 unsigned long address
,
818 unsigned i
= address
>> APERTURE_RANGE_SHIFT
;
819 struct aperture_range
*range
= dom
->aperture
[i
];
821 BUG_ON(i
>= APERTURE_MAX_RANGES
|| range
== NULL
);
823 if (address
>= dom
->next_address
)
824 dom
->need_flush
= true;
826 address
= (address
% APERTURE_RANGE_SIZE
) >> PAGE_SHIFT
;
828 iommu_area_free(range
->bitmap
, address
, pages
);
832 /****************************************************************************
834 * The next functions belong to the domain allocation. A domain is
835 * allocated for every IOMMU as the default domain. If device isolation
836 * is enabled, every device get its own domain. The most important thing
837 * about domains is the page table mapping the DMA address space they
840 ****************************************************************************/
842 static u16
domain_id_alloc(void)
847 write_lock_irqsave(&amd_iommu_devtable_lock
, flags
);
848 id
= find_first_zero_bit(amd_iommu_pd_alloc_bitmap
, MAX_DOMAIN_ID
);
850 if (id
> 0 && id
< MAX_DOMAIN_ID
)
851 __set_bit(id
, amd_iommu_pd_alloc_bitmap
);
854 write_unlock_irqrestore(&amd_iommu_devtable_lock
, flags
);
859 static void domain_id_free(int id
)
863 write_lock_irqsave(&amd_iommu_devtable_lock
, flags
);
864 if (id
> 0 && id
< MAX_DOMAIN_ID
)
865 __clear_bit(id
, amd_iommu_pd_alloc_bitmap
);
866 write_unlock_irqrestore(&amd_iommu_devtable_lock
, flags
);
870 * Used to reserve address ranges in the aperture (e.g. for exclusion
873 static void dma_ops_reserve_addresses(struct dma_ops_domain
*dom
,
874 unsigned long start_page
,
877 unsigned int i
, last_page
= dom
->aperture_size
>> PAGE_SHIFT
;
879 if (start_page
+ pages
> last_page
)
880 pages
= last_page
- start_page
;
882 for (i
= start_page
; i
< start_page
+ pages
; ++i
) {
883 int index
= i
/ APERTURE_RANGE_PAGES
;
884 int page
= i
% APERTURE_RANGE_PAGES
;
885 __set_bit(page
, dom
->aperture
[index
]->bitmap
);
889 static void free_pagetable(struct protection_domain
*domain
)
894 p1
= domain
->pt_root
;
899 for (i
= 0; i
< 512; ++i
) {
900 if (!IOMMU_PTE_PRESENT(p1
[i
]))
903 p2
= IOMMU_PTE_PAGE(p1
[i
]);
904 for (j
= 0; j
< 512; ++j
) {
905 if (!IOMMU_PTE_PRESENT(p2
[j
]))
907 p3
= IOMMU_PTE_PAGE(p2
[j
]);
908 free_page((unsigned long)p3
);
911 free_page((unsigned long)p2
);
914 free_page((unsigned long)p1
);
916 domain
->pt_root
= NULL
;
920 * Free a domain, only used if something went wrong in the
921 * allocation path and we need to free an already allocated page table
923 static void dma_ops_domain_free(struct dma_ops_domain
*dom
)
930 free_pagetable(&dom
->domain
);
932 for (i
= 0; i
< APERTURE_MAX_RANGES
; ++i
) {
933 if (!dom
->aperture
[i
])
935 free_page((unsigned long)dom
->aperture
[i
]->bitmap
);
936 kfree(dom
->aperture
[i
]);
943 * Allocates a new protection domain usable for the dma_ops functions.
944 * It also intializes the page table and the address allocator data
945 * structures required for the dma_ops interface
947 static struct dma_ops_domain
*dma_ops_domain_alloc(struct amd_iommu
*iommu
)
949 struct dma_ops_domain
*dma_dom
;
951 dma_dom
= kzalloc(sizeof(struct dma_ops_domain
), GFP_KERNEL
);
955 spin_lock_init(&dma_dom
->domain
.lock
);
957 dma_dom
->domain
.id
= domain_id_alloc();
958 if (dma_dom
->domain
.id
== 0)
960 dma_dom
->domain
.mode
= PAGE_MODE_3_LEVEL
;
961 dma_dom
->domain
.pt_root
= (void *)get_zeroed_page(GFP_KERNEL
);
962 dma_dom
->domain
.flags
= PD_DMA_OPS_MASK
;
963 dma_dom
->domain
.priv
= dma_dom
;
964 if (!dma_dom
->domain
.pt_root
)
967 dma_dom
->need_flush
= false;
968 dma_dom
->target_dev
= 0xffff;
970 if (alloc_new_range(iommu
, dma_dom
, true, GFP_KERNEL
))
974 * mark the first page as allocated so we never return 0 as
975 * a valid dma-address. So we can use 0 as error value
977 dma_dom
->aperture
[0]->bitmap
[0] = 1;
978 dma_dom
->next_address
= 0;
984 dma_ops_domain_free(dma_dom
);
990 * little helper function to check whether a given protection domain is a
993 static bool dma_ops_domain(struct protection_domain
*domain
)
995 return domain
->flags
& PD_DMA_OPS_MASK
;
999 * Find out the protection domain structure for a given PCI device. This
1000 * will give us the pointer to the page table root for example.
1002 static struct protection_domain
*domain_for_device(u16 devid
)
1004 struct protection_domain
*dom
;
1005 unsigned long flags
;
1007 read_lock_irqsave(&amd_iommu_devtable_lock
, flags
);
1008 dom
= amd_iommu_pd_table
[devid
];
1009 read_unlock_irqrestore(&amd_iommu_devtable_lock
, flags
);
1015 * If a device is not yet associated with a domain, this function does
1016 * assigns it visible for the hardware
1018 static void attach_device(struct amd_iommu
*iommu
,
1019 struct protection_domain
*domain
,
1022 unsigned long flags
;
1023 u64 pte_root
= virt_to_phys(domain
->pt_root
);
1025 domain
->dev_cnt
+= 1;
1027 pte_root
|= (domain
->mode
& DEV_ENTRY_MODE_MASK
)
1028 << DEV_ENTRY_MODE_SHIFT
;
1029 pte_root
|= IOMMU_PTE_IR
| IOMMU_PTE_IW
| IOMMU_PTE_P
| IOMMU_PTE_TV
;
1031 write_lock_irqsave(&amd_iommu_devtable_lock
, flags
);
1032 amd_iommu_dev_table
[devid
].data
[0] = lower_32_bits(pte_root
);
1033 amd_iommu_dev_table
[devid
].data
[1] = upper_32_bits(pte_root
);
1034 amd_iommu_dev_table
[devid
].data
[2] = domain
->id
;
1036 amd_iommu_pd_table
[devid
] = domain
;
1037 write_unlock_irqrestore(&amd_iommu_devtable_lock
, flags
);
1039 iommu_queue_inv_dev_entry(iommu
, devid
);
1043 * Removes a device from a protection domain (unlocked)
1045 static void __detach_device(struct protection_domain
*domain
, u16 devid
)
1049 spin_lock(&domain
->lock
);
1051 /* remove domain from the lookup table */
1052 amd_iommu_pd_table
[devid
] = NULL
;
1054 /* remove entry from the device table seen by the hardware */
1055 amd_iommu_dev_table
[devid
].data
[0] = IOMMU_PTE_P
| IOMMU_PTE_TV
;
1056 amd_iommu_dev_table
[devid
].data
[1] = 0;
1057 amd_iommu_dev_table
[devid
].data
[2] = 0;
1059 /* decrease reference counter */
1060 domain
->dev_cnt
-= 1;
1063 spin_unlock(&domain
->lock
);
1067 * Removes a device from a protection domain (with devtable_lock held)
1069 static void detach_device(struct protection_domain
*domain
, u16 devid
)
1071 unsigned long flags
;
1073 /* lock device table */
1074 write_lock_irqsave(&amd_iommu_devtable_lock
, flags
);
1075 __detach_device(domain
, devid
);
1076 write_unlock_irqrestore(&amd_iommu_devtable_lock
, flags
);
1079 static int device_change_notifier(struct notifier_block
*nb
,
1080 unsigned long action
, void *data
)
1082 struct device
*dev
= data
;
1083 struct pci_dev
*pdev
= to_pci_dev(dev
);
1084 u16 devid
= calc_devid(pdev
->bus
->number
, pdev
->devfn
);
1085 struct protection_domain
*domain
;
1086 struct dma_ops_domain
*dma_domain
;
1087 struct amd_iommu
*iommu
;
1088 unsigned long flags
;
1090 if (devid
> amd_iommu_last_bdf
)
1093 devid
= amd_iommu_alias_table
[devid
];
1095 iommu
= amd_iommu_rlookup_table
[devid
];
1099 domain
= domain_for_device(devid
);
1101 if (domain
&& !dma_ops_domain(domain
))
1102 WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound "
1103 "to a non-dma-ops domain\n", dev_name(dev
));
1106 case BUS_NOTIFY_BOUND_DRIVER
:
1109 dma_domain
= find_protection_domain(devid
);
1111 dma_domain
= iommu
->default_dom
;
1112 attach_device(iommu
, &dma_domain
->domain
, devid
);
1113 printk(KERN_INFO
"AMD IOMMU: Using protection domain %d for "
1114 "device %s\n", dma_domain
->domain
.id
, dev_name(dev
));
1116 case BUS_NOTIFY_UNBIND_DRIVER
:
1119 detach_device(domain
, devid
);
1121 case BUS_NOTIFY_ADD_DEVICE
:
1122 /* allocate a protection domain if a device is added */
1123 dma_domain
= find_protection_domain(devid
);
1126 dma_domain
= dma_ops_domain_alloc(iommu
);
1129 dma_domain
->target_dev
= devid
;
1131 spin_lock_irqsave(&iommu_pd_list_lock
, flags
);
1132 list_add_tail(&dma_domain
->list
, &iommu_pd_list
);
1133 spin_unlock_irqrestore(&iommu_pd_list_lock
, flags
);
1140 iommu_queue_inv_dev_entry(iommu
, devid
);
1141 iommu_completion_wait(iommu
);
1147 struct notifier_block device_nb
= {
1148 .notifier_call
= device_change_notifier
,
1151 /*****************************************************************************
1153 * The next functions belong to the dma_ops mapping/unmapping code.
1155 *****************************************************************************/
1158 * This function checks if the driver got a valid device from the caller to
1159 * avoid dereferencing invalid pointers.
1161 static bool check_device(struct device
*dev
)
1163 if (!dev
|| !dev
->dma_mask
)
1170 * In this function the list of preallocated protection domains is traversed to
1171 * find the domain for a specific device
1173 static struct dma_ops_domain
*find_protection_domain(u16 devid
)
1175 struct dma_ops_domain
*entry
, *ret
= NULL
;
1176 unsigned long flags
;
1178 if (list_empty(&iommu_pd_list
))
1181 spin_lock_irqsave(&iommu_pd_list_lock
, flags
);
1183 list_for_each_entry(entry
, &iommu_pd_list
, list
) {
1184 if (entry
->target_dev
== devid
) {
1190 spin_unlock_irqrestore(&iommu_pd_list_lock
, flags
);
1196 * In the dma_ops path we only have the struct device. This function
1197 * finds the corresponding IOMMU, the protection domain and the
1198 * requestor id for a given device.
1199 * If the device is not yet associated with a domain this is also done
1202 static int get_device_resources(struct device
*dev
,
1203 struct amd_iommu
**iommu
,
1204 struct protection_domain
**domain
,
1207 struct dma_ops_domain
*dma_dom
;
1208 struct pci_dev
*pcidev
;
1215 if (dev
->bus
!= &pci_bus_type
)
1218 pcidev
= to_pci_dev(dev
);
1219 _bdf
= calc_devid(pcidev
->bus
->number
, pcidev
->devfn
);
1221 /* device not translated by any IOMMU in the system? */
1222 if (_bdf
> amd_iommu_last_bdf
)
1225 *bdf
= amd_iommu_alias_table
[_bdf
];
1227 *iommu
= amd_iommu_rlookup_table
[*bdf
];
1230 *domain
= domain_for_device(*bdf
);
1231 if (*domain
== NULL
) {
1232 dma_dom
= find_protection_domain(*bdf
);
1234 dma_dom
= (*iommu
)->default_dom
;
1235 *domain
= &dma_dom
->domain
;
1236 attach_device(*iommu
, *domain
, *bdf
);
1237 printk(KERN_INFO
"AMD IOMMU: Using protection domain %d for "
1238 "device %s\n", (*domain
)->id
, dev_name(dev
));
1241 if (domain_for_device(_bdf
) == NULL
)
1242 attach_device(*iommu
, *domain
, _bdf
);
1248 * If the pte_page is not yet allocated this function is called
1250 static u64
* alloc_pte(struct protection_domain
*dom
,
1251 unsigned long address
, u64
**pte_page
, gfp_t gfp
)
1255 pte
= &dom
->pt_root
[IOMMU_PTE_L2_INDEX(address
)];
1257 if (!IOMMU_PTE_PRESENT(*pte
)) {
1258 page
= (u64
*)get_zeroed_page(gfp
);
1261 *pte
= IOMMU_L2_PDE(virt_to_phys(page
));
1264 pte
= IOMMU_PTE_PAGE(*pte
);
1265 pte
= &pte
[IOMMU_PTE_L1_INDEX(address
)];
1267 if (!IOMMU_PTE_PRESENT(*pte
)) {
1268 page
= (u64
*)get_zeroed_page(gfp
);
1271 *pte
= IOMMU_L1_PDE(virt_to_phys(page
));
1274 pte
= IOMMU_PTE_PAGE(*pte
);
1279 pte
= &pte
[IOMMU_PTE_L0_INDEX(address
)];
1285 * This function fetches the PTE for a given address in the aperture
1287 static u64
* dma_ops_get_pte(struct dma_ops_domain
*dom
,
1288 unsigned long address
)
1290 struct aperture_range
*aperture
;
1291 u64
*pte
, *pte_page
;
1293 aperture
= dom
->aperture
[APERTURE_RANGE_INDEX(address
)];
1297 pte
= aperture
->pte_pages
[APERTURE_PAGE_INDEX(address
)];
1299 pte
= alloc_pte(&dom
->domain
, address
, &pte_page
, GFP_ATOMIC
);
1300 aperture
->pte_pages
[APERTURE_PAGE_INDEX(address
)] = pte_page
;
1302 pte
+= IOMMU_PTE_L0_INDEX(address
);
1308 * This is the generic map function. It maps one 4kb page at paddr to
1309 * the given address in the DMA address space for the domain.
1311 static dma_addr_t
dma_ops_domain_map(struct amd_iommu
*iommu
,
1312 struct dma_ops_domain
*dom
,
1313 unsigned long address
,
1319 WARN_ON(address
> dom
->aperture_size
);
1323 pte
= dma_ops_get_pte(dom
, address
);
1325 return bad_dma_address
;
1327 __pte
= paddr
| IOMMU_PTE_P
| IOMMU_PTE_FC
;
1329 if (direction
== DMA_TO_DEVICE
)
1330 __pte
|= IOMMU_PTE_IR
;
1331 else if (direction
== DMA_FROM_DEVICE
)
1332 __pte
|= IOMMU_PTE_IW
;
1333 else if (direction
== DMA_BIDIRECTIONAL
)
1334 __pte
|= IOMMU_PTE_IR
| IOMMU_PTE_IW
;
1340 return (dma_addr_t
)address
;
1344 * The generic unmapping function for on page in the DMA address space.
1346 static void dma_ops_domain_unmap(struct amd_iommu
*iommu
,
1347 struct dma_ops_domain
*dom
,
1348 unsigned long address
)
1350 struct aperture_range
*aperture
;
1353 if (address
>= dom
->aperture_size
)
1356 aperture
= dom
->aperture
[APERTURE_RANGE_INDEX(address
)];
1360 pte
= aperture
->pte_pages
[APERTURE_PAGE_INDEX(address
)];
1364 pte
+= IOMMU_PTE_L0_INDEX(address
);
1372 * This function contains common code for mapping of a physically
1373 * contiguous memory region into DMA address space. It is used by all
1374 * mapping functions provided with this IOMMU driver.
1375 * Must be called with the domain lock held.
1377 static dma_addr_t
__map_single(struct device
*dev
,
1378 struct amd_iommu
*iommu
,
1379 struct dma_ops_domain
*dma_dom
,
1386 dma_addr_t offset
= paddr
& ~PAGE_MASK
;
1387 dma_addr_t address
, start
, ret
;
1389 unsigned long align_mask
= 0;
1392 pages
= iommu_num_pages(paddr
, size
, PAGE_SIZE
);
1395 INC_STATS_COUNTER(total_map_requests
);
1398 INC_STATS_COUNTER(cross_page
);
1401 align_mask
= (1UL << get_order(size
)) - 1;
1404 address
= dma_ops_alloc_addresses(dev
, dma_dom
, pages
, align_mask
,
1406 if (unlikely(address
== bad_dma_address
)) {
1408 * setting next_address here will let the address
1409 * allocator only scan the new allocated range in the
1410 * first run. This is a small optimization.
1412 dma_dom
->next_address
= dma_dom
->aperture_size
;
1414 if (alloc_new_range(iommu
, dma_dom
, false, GFP_ATOMIC
))
1418 * aperture was sucessfully enlarged by 128 MB, try
1425 for (i
= 0; i
< pages
; ++i
) {
1426 ret
= dma_ops_domain_map(iommu
, dma_dom
, start
, paddr
, dir
);
1427 if (ret
== bad_dma_address
)
1435 ADD_STATS_COUNTER(alloced_io_mem
, size
);
1437 if (unlikely(dma_dom
->need_flush
&& !amd_iommu_unmap_flush
)) {
1438 iommu_flush_tlb(iommu
, dma_dom
->domain
.id
);
1439 dma_dom
->need_flush
= false;
1440 } else if (unlikely(iommu_has_npcache(iommu
)))
1441 iommu_flush_pages(iommu
, dma_dom
->domain
.id
, address
, size
);
1448 for (--i
; i
>= 0; --i
) {
1450 dma_ops_domain_unmap(iommu
, dma_dom
, start
);
1453 dma_ops_free_addresses(dma_dom
, address
, pages
);
1455 return bad_dma_address
;
1459 * Does the reverse of the __map_single function. Must be called with
1460 * the domain lock held too
1462 static void __unmap_single(struct amd_iommu
*iommu
,
1463 struct dma_ops_domain
*dma_dom
,
1464 dma_addr_t dma_addr
,
1468 dma_addr_t i
, start
;
1471 if ((dma_addr
== bad_dma_address
) ||
1472 (dma_addr
+ size
> dma_dom
->aperture_size
))
1475 pages
= iommu_num_pages(dma_addr
, size
, PAGE_SIZE
);
1476 dma_addr
&= PAGE_MASK
;
1479 for (i
= 0; i
< pages
; ++i
) {
1480 dma_ops_domain_unmap(iommu
, dma_dom
, start
);
1484 SUB_STATS_COUNTER(alloced_io_mem
, size
);
1486 dma_ops_free_addresses(dma_dom
, dma_addr
, pages
);
1488 if (amd_iommu_unmap_flush
|| dma_dom
->need_flush
) {
1489 iommu_flush_pages(iommu
, dma_dom
->domain
.id
, dma_addr
, size
);
1490 dma_dom
->need_flush
= false;
1495 * The exported map_single function for dma_ops.
1497 static dma_addr_t
map_page(struct device
*dev
, struct page
*page
,
1498 unsigned long offset
, size_t size
,
1499 enum dma_data_direction dir
,
1500 struct dma_attrs
*attrs
)
1502 unsigned long flags
;
1503 struct amd_iommu
*iommu
;
1504 struct protection_domain
*domain
;
1508 phys_addr_t paddr
= page_to_phys(page
) + offset
;
1510 INC_STATS_COUNTER(cnt_map_single
);
1512 if (!check_device(dev
))
1513 return bad_dma_address
;
1515 dma_mask
= *dev
->dma_mask
;
1517 get_device_resources(dev
, &iommu
, &domain
, &devid
);
1519 if (iommu
== NULL
|| domain
== NULL
)
1520 /* device not handled by any AMD IOMMU */
1521 return (dma_addr_t
)paddr
;
1523 if (!dma_ops_domain(domain
))
1524 return bad_dma_address
;
1526 spin_lock_irqsave(&domain
->lock
, flags
);
1527 addr
= __map_single(dev
, iommu
, domain
->priv
, paddr
, size
, dir
, false,
1529 if (addr
== bad_dma_address
)
1532 iommu_completion_wait(iommu
);
1535 spin_unlock_irqrestore(&domain
->lock
, flags
);
1541 * The exported unmap_single function for dma_ops.
1543 static void unmap_page(struct device
*dev
, dma_addr_t dma_addr
, size_t size
,
1544 enum dma_data_direction dir
, struct dma_attrs
*attrs
)
1546 unsigned long flags
;
1547 struct amd_iommu
*iommu
;
1548 struct protection_domain
*domain
;
1551 INC_STATS_COUNTER(cnt_unmap_single
);
1553 if (!check_device(dev
) ||
1554 !get_device_resources(dev
, &iommu
, &domain
, &devid
))
1555 /* device not handled by any AMD IOMMU */
1558 if (!dma_ops_domain(domain
))
1561 spin_lock_irqsave(&domain
->lock
, flags
);
1563 __unmap_single(iommu
, domain
->priv
, dma_addr
, size
, dir
);
1565 iommu_completion_wait(iommu
);
1567 spin_unlock_irqrestore(&domain
->lock
, flags
);
1571 * This is a special map_sg function which is used if we should map a
1572 * device which is not handled by an AMD IOMMU in the system.
1574 static int map_sg_no_iommu(struct device
*dev
, struct scatterlist
*sglist
,
1575 int nelems
, int dir
)
1577 struct scatterlist
*s
;
1580 for_each_sg(sglist
, s
, nelems
, i
) {
1581 s
->dma_address
= (dma_addr_t
)sg_phys(s
);
1582 s
->dma_length
= s
->length
;
1589 * The exported map_sg function for dma_ops (handles scatter-gather
1592 static int map_sg(struct device
*dev
, struct scatterlist
*sglist
,
1593 int nelems
, enum dma_data_direction dir
,
1594 struct dma_attrs
*attrs
)
1596 unsigned long flags
;
1597 struct amd_iommu
*iommu
;
1598 struct protection_domain
*domain
;
1601 struct scatterlist
*s
;
1603 int mapped_elems
= 0;
1606 INC_STATS_COUNTER(cnt_map_sg
);
1608 if (!check_device(dev
))
1611 dma_mask
= *dev
->dma_mask
;
1613 get_device_resources(dev
, &iommu
, &domain
, &devid
);
1615 if (!iommu
|| !domain
)
1616 return map_sg_no_iommu(dev
, sglist
, nelems
, dir
);
1618 if (!dma_ops_domain(domain
))
1621 spin_lock_irqsave(&domain
->lock
, flags
);
1623 for_each_sg(sglist
, s
, nelems
, i
) {
1626 s
->dma_address
= __map_single(dev
, iommu
, domain
->priv
,
1627 paddr
, s
->length
, dir
, false,
1630 if (s
->dma_address
) {
1631 s
->dma_length
= s
->length
;
1637 iommu_completion_wait(iommu
);
1640 spin_unlock_irqrestore(&domain
->lock
, flags
);
1642 return mapped_elems
;
1644 for_each_sg(sglist
, s
, mapped_elems
, i
) {
1646 __unmap_single(iommu
, domain
->priv
, s
->dma_address
,
1647 s
->dma_length
, dir
);
1648 s
->dma_address
= s
->dma_length
= 0;
1657 * The exported map_sg function for dma_ops (handles scatter-gather
1660 static void unmap_sg(struct device
*dev
, struct scatterlist
*sglist
,
1661 int nelems
, enum dma_data_direction dir
,
1662 struct dma_attrs
*attrs
)
1664 unsigned long flags
;
1665 struct amd_iommu
*iommu
;
1666 struct protection_domain
*domain
;
1667 struct scatterlist
*s
;
1671 INC_STATS_COUNTER(cnt_unmap_sg
);
1673 if (!check_device(dev
) ||
1674 !get_device_resources(dev
, &iommu
, &domain
, &devid
))
1677 if (!dma_ops_domain(domain
))
1680 spin_lock_irqsave(&domain
->lock
, flags
);
1682 for_each_sg(sglist
, s
, nelems
, i
) {
1683 __unmap_single(iommu
, domain
->priv
, s
->dma_address
,
1684 s
->dma_length
, dir
);
1685 s
->dma_address
= s
->dma_length
= 0;
1688 iommu_completion_wait(iommu
);
1690 spin_unlock_irqrestore(&domain
->lock
, flags
);
1694 * The exported alloc_coherent function for dma_ops.
1696 static void *alloc_coherent(struct device
*dev
, size_t size
,
1697 dma_addr_t
*dma_addr
, gfp_t flag
)
1699 unsigned long flags
;
1701 struct amd_iommu
*iommu
;
1702 struct protection_domain
*domain
;
1705 u64 dma_mask
= dev
->coherent_dma_mask
;
1707 INC_STATS_COUNTER(cnt_alloc_coherent
);
1709 if (!check_device(dev
))
1712 if (!get_device_resources(dev
, &iommu
, &domain
, &devid
))
1713 flag
&= ~(__GFP_DMA
| __GFP_HIGHMEM
| __GFP_DMA32
);
1716 virt_addr
= (void *)__get_free_pages(flag
, get_order(size
));
1720 paddr
= virt_to_phys(virt_addr
);
1722 if (!iommu
|| !domain
) {
1723 *dma_addr
= (dma_addr_t
)paddr
;
1727 if (!dma_ops_domain(domain
))
1731 dma_mask
= *dev
->dma_mask
;
1733 spin_lock_irqsave(&domain
->lock
, flags
);
1735 *dma_addr
= __map_single(dev
, iommu
, domain
->priv
, paddr
,
1736 size
, DMA_BIDIRECTIONAL
, true, dma_mask
);
1738 if (*dma_addr
== bad_dma_address
)
1741 iommu_completion_wait(iommu
);
1743 spin_unlock_irqrestore(&domain
->lock
, flags
);
1749 free_pages((unsigned long)virt_addr
, get_order(size
));
1755 * The exported free_coherent function for dma_ops.
1757 static void free_coherent(struct device
*dev
, size_t size
,
1758 void *virt_addr
, dma_addr_t dma_addr
)
1760 unsigned long flags
;
1761 struct amd_iommu
*iommu
;
1762 struct protection_domain
*domain
;
1765 INC_STATS_COUNTER(cnt_free_coherent
);
1767 if (!check_device(dev
))
1770 get_device_resources(dev
, &iommu
, &domain
, &devid
);
1772 if (!iommu
|| !domain
)
1775 if (!dma_ops_domain(domain
))
1778 spin_lock_irqsave(&domain
->lock
, flags
);
1780 __unmap_single(iommu
, domain
->priv
, dma_addr
, size
, DMA_BIDIRECTIONAL
);
1782 iommu_completion_wait(iommu
);
1784 spin_unlock_irqrestore(&domain
->lock
, flags
);
1787 free_pages((unsigned long)virt_addr
, get_order(size
));
1791 * This function is called by the DMA layer to find out if we can handle a
1792 * particular device. It is part of the dma_ops.
1794 static int amd_iommu_dma_supported(struct device
*dev
, u64 mask
)
1797 struct pci_dev
*pcidev
;
1799 /* No device or no PCI device */
1800 if (!dev
|| dev
->bus
!= &pci_bus_type
)
1803 pcidev
= to_pci_dev(dev
);
1805 bdf
= calc_devid(pcidev
->bus
->number
, pcidev
->devfn
);
1807 /* Out of our scope? */
1808 if (bdf
> amd_iommu_last_bdf
)
1815 * The function for pre-allocating protection domains.
1817 * If the driver core informs the DMA layer if a driver grabs a device
1818 * we don't need to preallocate the protection domains anymore.
1819 * For now we have to.
1821 static void prealloc_protection_domains(void)
1823 struct pci_dev
*dev
= NULL
;
1824 struct dma_ops_domain
*dma_dom
;
1825 struct amd_iommu
*iommu
;
1828 while ((dev
= pci_get_device(PCI_ANY_ID
, PCI_ANY_ID
, dev
)) != NULL
) {
1829 devid
= calc_devid(dev
->bus
->number
, dev
->devfn
);
1830 if (devid
> amd_iommu_last_bdf
)
1832 devid
= amd_iommu_alias_table
[devid
];
1833 if (domain_for_device(devid
))
1835 iommu
= amd_iommu_rlookup_table
[devid
];
1838 dma_dom
= dma_ops_domain_alloc(iommu
);
1841 init_unity_mappings_for_device(dma_dom
, devid
);
1842 dma_dom
->target_dev
= devid
;
1844 list_add_tail(&dma_dom
->list
, &iommu_pd_list
);
1848 static struct dma_map_ops amd_iommu_dma_ops
= {
1849 .alloc_coherent
= alloc_coherent
,
1850 .free_coherent
= free_coherent
,
1851 .map_page
= map_page
,
1852 .unmap_page
= unmap_page
,
1854 .unmap_sg
= unmap_sg
,
1855 .dma_supported
= amd_iommu_dma_supported
,
1859 * The function which clues the AMD IOMMU driver into dma_ops.
1861 int __init
amd_iommu_init_dma_ops(void)
1863 struct amd_iommu
*iommu
;
1867 * first allocate a default protection domain for every IOMMU we
1868 * found in the system. Devices not assigned to any other
1869 * protection domain will be assigned to the default one.
1871 list_for_each_entry(iommu
, &amd_iommu_list
, list
) {
1872 iommu
->default_dom
= dma_ops_domain_alloc(iommu
);
1873 if (iommu
->default_dom
== NULL
)
1875 iommu
->default_dom
->domain
.flags
|= PD_DEFAULT_MASK
;
1876 ret
= iommu_init_unity_mappings(iommu
);
1882 * If device isolation is enabled, pre-allocate the protection
1883 * domains for each device.
1885 if (amd_iommu_isolate
)
1886 prealloc_protection_domains();
1890 bad_dma_address
= 0;
1891 #ifdef CONFIG_GART_IOMMU
1892 gart_iommu_aperture_disabled
= 1;
1893 gart_iommu_aperture
= 0;
1896 /* Make the driver finally visible to the drivers */
1897 dma_ops
= &amd_iommu_dma_ops
;
1899 register_iommu(&amd_iommu_ops
);
1901 bus_register_notifier(&pci_bus_type
, &device_nb
);
1903 amd_iommu_stats_init();
1909 list_for_each_entry(iommu
, &amd_iommu_list
, list
) {
1910 if (iommu
->default_dom
)
1911 dma_ops_domain_free(iommu
->default_dom
);
1917 /*****************************************************************************
1919 * The following functions belong to the exported interface of AMD IOMMU
1921 * This interface allows access to lower level functions of the IOMMU
1922 * like protection domain handling and assignement of devices to domains
1923 * which is not possible with the dma_ops interface.
1925 *****************************************************************************/
1927 static void cleanup_domain(struct protection_domain
*domain
)
1929 unsigned long flags
;
1932 write_lock_irqsave(&amd_iommu_devtable_lock
, flags
);
1934 for (devid
= 0; devid
<= amd_iommu_last_bdf
; ++devid
)
1935 if (amd_iommu_pd_table
[devid
] == domain
)
1936 __detach_device(domain
, devid
);
1938 write_unlock_irqrestore(&amd_iommu_devtable_lock
, flags
);
1941 static int amd_iommu_domain_init(struct iommu_domain
*dom
)
1943 struct protection_domain
*domain
;
1945 domain
= kzalloc(sizeof(*domain
), GFP_KERNEL
);
1949 spin_lock_init(&domain
->lock
);
1950 domain
->mode
= PAGE_MODE_3_LEVEL
;
1951 domain
->id
= domain_id_alloc();
1954 domain
->pt_root
= (void *)get_zeroed_page(GFP_KERNEL
);
1955 if (!domain
->pt_root
)
1968 static void amd_iommu_domain_destroy(struct iommu_domain
*dom
)
1970 struct protection_domain
*domain
= dom
->priv
;
1975 if (domain
->dev_cnt
> 0)
1976 cleanup_domain(domain
);
1978 BUG_ON(domain
->dev_cnt
!= 0);
1980 free_pagetable(domain
);
1982 domain_id_free(domain
->id
);
1989 static void amd_iommu_detach_device(struct iommu_domain
*dom
,
1992 struct protection_domain
*domain
= dom
->priv
;
1993 struct amd_iommu
*iommu
;
1994 struct pci_dev
*pdev
;
1997 if (dev
->bus
!= &pci_bus_type
)
2000 pdev
= to_pci_dev(dev
);
2002 devid
= calc_devid(pdev
->bus
->number
, pdev
->devfn
);
2005 detach_device(domain
, devid
);
2007 iommu
= amd_iommu_rlookup_table
[devid
];
2011 iommu_queue_inv_dev_entry(iommu
, devid
);
2012 iommu_completion_wait(iommu
);
2015 static int amd_iommu_attach_device(struct iommu_domain
*dom
,
2018 struct protection_domain
*domain
= dom
->priv
;
2019 struct protection_domain
*old_domain
;
2020 struct amd_iommu
*iommu
;
2021 struct pci_dev
*pdev
;
2024 if (dev
->bus
!= &pci_bus_type
)
2027 pdev
= to_pci_dev(dev
);
2029 devid
= calc_devid(pdev
->bus
->number
, pdev
->devfn
);
2031 if (devid
>= amd_iommu_last_bdf
||
2032 devid
!= amd_iommu_alias_table
[devid
])
2035 iommu
= amd_iommu_rlookup_table
[devid
];
2039 old_domain
= domain_for_device(devid
);
2043 attach_device(iommu
, domain
, devid
);
2045 iommu_completion_wait(iommu
);
2050 static int amd_iommu_map_range(struct iommu_domain
*dom
,
2051 unsigned long iova
, phys_addr_t paddr
,
2052 size_t size
, int iommu_prot
)
2054 struct protection_domain
*domain
= dom
->priv
;
2055 unsigned long i
, npages
= iommu_num_pages(paddr
, size
, PAGE_SIZE
);
2059 if (iommu_prot
& IOMMU_READ
)
2060 prot
|= IOMMU_PROT_IR
;
2061 if (iommu_prot
& IOMMU_WRITE
)
2062 prot
|= IOMMU_PROT_IW
;
2067 for (i
= 0; i
< npages
; ++i
) {
2068 ret
= iommu_map_page(domain
, iova
, paddr
, prot
);
2079 static void amd_iommu_unmap_range(struct iommu_domain
*dom
,
2080 unsigned long iova
, size_t size
)
2083 struct protection_domain
*domain
= dom
->priv
;
2084 unsigned long i
, npages
= iommu_num_pages(iova
, size
, PAGE_SIZE
);
2088 for (i
= 0; i
< npages
; ++i
) {
2089 iommu_unmap_page(domain
, iova
);
2093 iommu_flush_domain(domain
->id
);
2096 static phys_addr_t
amd_iommu_iova_to_phys(struct iommu_domain
*dom
,
2099 struct protection_domain
*domain
= dom
->priv
;
2100 unsigned long offset
= iova
& ~PAGE_MASK
;
2104 pte
= &domain
->pt_root
[IOMMU_PTE_L2_INDEX(iova
)];
2106 if (!IOMMU_PTE_PRESENT(*pte
))
2109 pte
= IOMMU_PTE_PAGE(*pte
);
2110 pte
= &pte
[IOMMU_PTE_L1_INDEX(iova
)];
2112 if (!IOMMU_PTE_PRESENT(*pte
))
2115 pte
= IOMMU_PTE_PAGE(*pte
);
2116 pte
= &pte
[IOMMU_PTE_L0_INDEX(iova
)];
2118 if (!IOMMU_PTE_PRESENT(*pte
))
2121 paddr
= *pte
& IOMMU_PAGE_MASK
;
2127 static int amd_iommu_domain_has_cap(struct iommu_domain
*domain
,
2133 static struct iommu_ops amd_iommu_ops
= {
2134 .domain_init
= amd_iommu_domain_init
,
2135 .domain_destroy
= amd_iommu_domain_destroy
,
2136 .attach_dev
= amd_iommu_attach_device
,
2137 .detach_dev
= amd_iommu_detach_device
,
2138 .map
= amd_iommu_map_range
,
2139 .unmap
= amd_iommu_unmap_range
,
2140 .iova_to_phys
= amd_iommu_iova_to_phys
,
2141 .domain_has_cap
= amd_iommu_domain_has_cap
,