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 #ifndef BUS_NOTIFY_UNBOUND_DRIVER
66 #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
69 #ifdef CONFIG_AMD_IOMMU_STATS
72 * Initialization code for statistics collection
75 DECLARE_STATS_COUNTER(compl_wait);
76 DECLARE_STATS_COUNTER(cnt_map_single);
77 DECLARE_STATS_COUNTER(cnt_unmap_single);
78 DECLARE_STATS_COUNTER(cnt_map_sg);
79 DECLARE_STATS_COUNTER(cnt_unmap_sg);
80 DECLARE_STATS_COUNTER(cnt_alloc_coherent);
81 DECLARE_STATS_COUNTER(cnt_free_coherent);
82 DECLARE_STATS_COUNTER(cross_page);
83 DECLARE_STATS_COUNTER(domain_flush_single);
84 DECLARE_STATS_COUNTER(domain_flush_all);
85 DECLARE_STATS_COUNTER(alloced_io_mem);
86 DECLARE_STATS_COUNTER(total_map_requests);
88 static struct dentry *stats_dir;
89 static struct dentry *de_isolate;
90 static struct dentry *de_fflush;
92 static void amd_iommu_stats_add(struct __iommu_counter *cnt)
94 if (stats_dir == NULL)
97 cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir,
101 static void amd_iommu_stats_init(void)
103 stats_dir = debugfs_create_dir("amd-iommu", NULL);
104 if (stats_dir == NULL)
107 de_isolate = debugfs_create_bool("isolation", 0444, stats_dir,
108 (u32 *)&amd_iommu_isolate);
110 de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
111 (u32 *)&amd_iommu_unmap_flush);
113 amd_iommu_stats_add(&compl_wait);
114 amd_iommu_stats_add(&cnt_map_single);
115 amd_iommu_stats_add(&cnt_unmap_single);
116 amd_iommu_stats_add(&cnt_map_sg);
117 amd_iommu_stats_add(&cnt_unmap_sg);
118 amd_iommu_stats_add(&cnt_alloc_coherent);
119 amd_iommu_stats_add(&cnt_free_coherent);
120 amd_iommu_stats_add(&cross_page);
121 amd_iommu_stats_add(&domain_flush_single);
122 amd_iommu_stats_add(&domain_flush_all);
123 amd_iommu_stats_add(&alloced_io_mem);
124 amd_iommu_stats_add(&total_map_requests);
129 /* returns !0 if the IOMMU is caching non-present entries in its TLB */
130 static int iommu_has_npcache(struct amd_iommu *iommu)
132 return iommu->cap & (1UL << IOMMU_CAP_NPCACHE);
135 /****************************************************************************
137 * Interrupt handling functions
139 ****************************************************************************/
141 static void iommu_print_event(void *__evt)
144 int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
145 int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
146 int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
147 int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
148 u64 address = (u64)(((u64)event[3]) << 32) | event[2];
150 printk(KERN_ERR "AMD IOMMU: Event logged [");
153 case EVENT_TYPE_ILL_DEV:
154 printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x "
155 "address=0x%016llx flags=0x%04x]\n",
156 PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
159 case EVENT_TYPE_IO_FAULT:
160 printk("IO_PAGE_FAULT device=%02x:%02x.%x "
161 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
162 PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
163 domid, address, flags);
165 case EVENT_TYPE_DEV_TAB_ERR:
166 printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
167 "address=0x%016llx flags=0x%04x]\n",
168 PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
171 case EVENT_TYPE_PAGE_TAB_ERR:
172 printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
173 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
174 PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
175 domid, address, flags);
177 case EVENT_TYPE_ILL_CMD:
178 printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
180 case EVENT_TYPE_CMD_HARD_ERR:
181 printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
182 "flags=0x%04x]\n", address, flags);
184 case EVENT_TYPE_IOTLB_INV_TO:
185 printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
186 "address=0x%016llx]\n",
187 PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
190 case EVENT_TYPE_INV_DEV_REQ:
191 printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x "
192 "address=0x%016llx flags=0x%04x]\n",
193 PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid),
197 printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
201 static void iommu_poll_events(struct amd_iommu *iommu)
206 spin_lock_irqsave(&iommu->lock, flags);
208 head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
209 tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
211 while (head != tail) {
212 iommu_print_event(iommu->evt_buf + head);
213 head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
216 writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
218 spin_unlock_irqrestore(&iommu->lock, flags);
221 irqreturn_t amd_iommu_int_handler(int irq, void *data)
223 struct amd_iommu *iommu;
225 for_each_iommu(iommu)
226 iommu_poll_events(iommu);
231 /****************************************************************************
233 * IOMMU command queuing functions
235 ****************************************************************************/
238 * Writes the command to the IOMMUs command buffer and informs the
239 * hardware about the new command. Must be called with iommu->lock held.
241 static int __iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
246 tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
247 target = iommu->cmd_buf + tail;
248 memcpy_toio(target, cmd, sizeof(*cmd));
249 tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
250 head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
253 writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
259 * General queuing function for commands. Takes iommu->lock and calls
260 * __iommu_queue_command().
262 static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
267 spin_lock_irqsave(&iommu->lock, flags);
268 ret = __iommu_queue_command(iommu, cmd);
270 iommu->need_sync = true;
271 spin_unlock_irqrestore(&iommu->lock, flags);
277 * This function waits until an IOMMU has completed a completion
280 static void __iommu_wait_for_completion(struct amd_iommu *iommu)
286 INC_STATS_COUNTER(compl_wait);
288 while (!ready && (i < EXIT_LOOP_COUNT)) {
290 /* wait for the bit to become one */
291 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
292 ready = status & MMIO_STATUS_COM_WAIT_INT_MASK;
295 /* set bit back to zero */
296 status &= ~MMIO_STATUS_COM_WAIT_INT_MASK;
297 writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET);
299 if (unlikely(i == EXIT_LOOP_COUNT))
300 panic("AMD IOMMU: Completion wait loop failed\n");
304 * This function queues a completion wait command into the command
307 static int __iommu_completion_wait(struct amd_iommu *iommu)
309 struct iommu_cmd cmd;
311 memset(&cmd, 0, sizeof(cmd));
312 cmd.data[0] = CMD_COMPL_WAIT_INT_MASK;
313 CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT);
315 return __iommu_queue_command(iommu, &cmd);
319 * This function is called whenever we need to ensure that the IOMMU has
320 * completed execution of all commands we sent. It sends a
321 * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs
322 * us about that by writing a value to a physical address we pass with
325 static int iommu_completion_wait(struct amd_iommu *iommu)
330 spin_lock_irqsave(&iommu->lock, flags);
332 if (!iommu->need_sync)
335 ret = __iommu_completion_wait(iommu);
337 iommu->need_sync = false;
342 __iommu_wait_for_completion(iommu);
345 spin_unlock_irqrestore(&iommu->lock, flags);
351 * Command send function for invalidating a device table entry
353 static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid)
355 struct iommu_cmd cmd;
358 BUG_ON(iommu == NULL);
360 memset(&cmd, 0, sizeof(cmd));
361 CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY);
364 ret = iommu_queue_command(iommu, &cmd);
369 static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
370 u16 domid, int pde, int s)
372 memset(cmd, 0, sizeof(*cmd));
373 address &= PAGE_MASK;
374 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
375 cmd->data[1] |= domid;
376 cmd->data[2] = lower_32_bits(address);
377 cmd->data[3] = upper_32_bits(address);
378 if (s) /* size bit - we flush more than one 4kb page */
379 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
380 if (pde) /* PDE bit - we wan't flush everything not only the PTEs */
381 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
385 * Generic command send function for invalidaing TLB entries
387 static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu,
388 u64 address, u16 domid, int pde, int s)
390 struct iommu_cmd cmd;
393 __iommu_build_inv_iommu_pages(&cmd, address, domid, pde, s);
395 ret = iommu_queue_command(iommu, &cmd);
401 * TLB invalidation function which is called from the mapping functions.
402 * It invalidates a single PTE if the range to flush is within a single
403 * page. Otherwise it flushes the whole TLB of the IOMMU.
405 static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid,
406 u64 address, size_t size)
409 unsigned pages = iommu_num_pages(address, size, PAGE_SIZE);
411 address &= PAGE_MASK;
415 * If we have to flush more than one page, flush all
416 * TLB entries for this domain
418 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
422 iommu_queue_inv_iommu_pages(iommu, address, domid, 0, s);
427 /* Flush the whole IO/TLB for a given protection domain */
428 static void iommu_flush_tlb(struct amd_iommu *iommu, u16 domid)
430 u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
432 INC_STATS_COUNTER(domain_flush_single);
434 iommu_queue_inv_iommu_pages(iommu, address, domid, 0, 1);
437 /* Flush the whole IO/TLB for a given protection domain - including PDE */
438 static void iommu_flush_tlb_pde(struct amd_iommu *iommu, u16 domid)
440 u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
442 INC_STATS_COUNTER(domain_flush_single);
444 iommu_queue_inv_iommu_pages(iommu, address, domid, 1, 1);
448 * This function is used to flush the IO/TLB for a given protection domain
449 * on every IOMMU in the system
451 static void iommu_flush_domain(u16 domid)
454 struct amd_iommu *iommu;
455 struct iommu_cmd cmd;
457 INC_STATS_COUNTER(domain_flush_all);
459 __iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
462 for_each_iommu(iommu) {
463 spin_lock_irqsave(&iommu->lock, flags);
464 __iommu_queue_command(iommu, &cmd);
465 __iommu_completion_wait(iommu);
466 __iommu_wait_for_completion(iommu);
467 spin_unlock_irqrestore(&iommu->lock, flags);
471 void amd_iommu_flush_all_domains(void)
475 for (i = 1; i < MAX_DOMAIN_ID; ++i) {
476 if (!test_bit(i, amd_iommu_pd_alloc_bitmap))
478 iommu_flush_domain(i);
482 void amd_iommu_flush_all_devices(void)
484 struct amd_iommu *iommu;
487 for (i = 0; i <= amd_iommu_last_bdf; ++i) {
488 if (amd_iommu_pd_table[i] == NULL)
491 iommu = amd_iommu_rlookup_table[i];
495 iommu_queue_inv_dev_entry(iommu, i);
496 iommu_completion_wait(iommu);
500 /****************************************************************************
502 * The functions below are used the create the page table mappings for
503 * unity mapped regions.
505 ****************************************************************************/
508 * Generic mapping functions. It maps a physical address into a DMA
509 * address space. It allocates the page table pages if necessary.
510 * In the future it can be extended to a generic mapping function
511 * supporting all features of AMD IOMMU page tables like level skipping
512 * and full 64 bit address spaces.
514 static int iommu_map_page(struct protection_domain *dom,
515 unsigned long bus_addr,
516 unsigned long phys_addr,
521 bus_addr = PAGE_ALIGN(bus_addr);
522 phys_addr = PAGE_ALIGN(phys_addr);
524 /* only support 512GB address spaces for now */
525 if (bus_addr > IOMMU_MAP_SIZE_L3 || !(prot & IOMMU_PROT_MASK))
528 pte = alloc_pte(dom, bus_addr, NULL, GFP_KERNEL);
530 if (IOMMU_PTE_PRESENT(*pte))
533 __pte = phys_addr | IOMMU_PTE_P;
534 if (prot & IOMMU_PROT_IR)
535 __pte |= IOMMU_PTE_IR;
536 if (prot & IOMMU_PROT_IW)
537 __pte |= IOMMU_PTE_IW;
544 static void iommu_unmap_page(struct protection_domain *dom,
545 unsigned long bus_addr)
549 pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];
551 if (!IOMMU_PTE_PRESENT(*pte))
554 pte = IOMMU_PTE_PAGE(*pte);
555 pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
557 if (!IOMMU_PTE_PRESENT(*pte))
560 pte = IOMMU_PTE_PAGE(*pte);
561 pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
567 * This function checks if a specific unity mapping entry is needed for
568 * this specific IOMMU.
570 static int iommu_for_unity_map(struct amd_iommu *iommu,
571 struct unity_map_entry *entry)
575 for (i = entry->devid_start; i <= entry->devid_end; ++i) {
576 bdf = amd_iommu_alias_table[i];
577 if (amd_iommu_rlookup_table[bdf] == iommu)
585 * Init the unity mappings for a specific IOMMU in the system
587 * Basically iterates over all unity mapping entries and applies them to
588 * the default domain DMA of that IOMMU if necessary.
590 static int iommu_init_unity_mappings(struct amd_iommu *iommu)
592 struct unity_map_entry *entry;
595 list_for_each_entry(entry, &amd_iommu_unity_map, list) {
596 if (!iommu_for_unity_map(iommu, entry))
598 ret = dma_ops_unity_map(iommu->default_dom, entry);
607 * This function actually applies the mapping to the page table of the
610 static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
611 struct unity_map_entry *e)
616 for (addr = e->address_start; addr < e->address_end;
618 ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot);
622 * if unity mapping is in aperture range mark the page
623 * as allocated in the aperture
625 if (addr < dma_dom->aperture_size)
626 __set_bit(addr >> PAGE_SHIFT,
627 dma_dom->aperture[0]->bitmap);
634 * Inits the unity mappings required for a specific device
636 static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
639 struct unity_map_entry *e;
642 list_for_each_entry(e, &amd_iommu_unity_map, list) {
643 if (!(devid >= e->devid_start && devid <= e->devid_end))
645 ret = dma_ops_unity_map(dma_dom, e);
653 /****************************************************************************
655 * The next functions belong to the address allocator for the dma_ops
656 * interface functions. They work like the allocators in the other IOMMU
657 * drivers. Its basically a bitmap which marks the allocated pages in
658 * the aperture. Maybe it could be enhanced in the future to a more
659 * efficient allocator.
661 ****************************************************************************/
664 * The address allocator core functions.
666 * called with domain->lock held
670 * This function checks if there is a PTE for a given dma address. If
671 * there is one, it returns the pointer to it.
673 static u64* fetch_pte(struct protection_domain *domain,
674 unsigned long address)
678 pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(address)];
680 if (!IOMMU_PTE_PRESENT(*pte))
683 pte = IOMMU_PTE_PAGE(*pte);
684 pte = &pte[IOMMU_PTE_L1_INDEX(address)];
686 if (!IOMMU_PTE_PRESENT(*pte))
689 pte = IOMMU_PTE_PAGE(*pte);
690 pte = &pte[IOMMU_PTE_L0_INDEX(address)];
696 * This function is used to add a new aperture range to an existing
697 * aperture in case of dma_ops domain allocation or address allocation
700 static int alloc_new_range(struct amd_iommu *iommu,
701 struct dma_ops_domain *dma_dom,
702 bool populate, gfp_t gfp)
704 int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT;
707 #ifdef CONFIG_IOMMU_STRESS
711 if (index >= APERTURE_MAX_RANGES)
714 dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp);
715 if (!dma_dom->aperture[index])
718 dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp);
719 if (!dma_dom->aperture[index]->bitmap)
722 dma_dom->aperture[index]->offset = dma_dom->aperture_size;
725 unsigned long address = dma_dom->aperture_size;
726 int i, num_ptes = APERTURE_RANGE_PAGES / 512;
729 for (i = 0; i < num_ptes; ++i) {
730 pte = alloc_pte(&dma_dom->domain, address,
735 dma_dom->aperture[index]->pte_pages[i] = pte_page;
737 address += APERTURE_RANGE_SIZE / 64;
741 dma_dom->aperture_size += APERTURE_RANGE_SIZE;
743 /* Intialize the exclusion range if necessary */
744 if (iommu->exclusion_start &&
745 iommu->exclusion_start >= dma_dom->aperture[index]->offset &&
746 iommu->exclusion_start < dma_dom->aperture_size) {
747 unsigned long startpage = iommu->exclusion_start >> PAGE_SHIFT;
748 int pages = iommu_num_pages(iommu->exclusion_start,
749 iommu->exclusion_length,
751 dma_ops_reserve_addresses(dma_dom, startpage, pages);
755 * Check for areas already mapped as present in the new aperture
756 * range and mark those pages as reserved in the allocator. Such
757 * mappings may already exist as a result of requested unity
758 * mappings for devices.
760 for (i = dma_dom->aperture[index]->offset;
761 i < dma_dom->aperture_size;
763 u64 *pte = fetch_pte(&dma_dom->domain, i);
764 if (!pte || !IOMMU_PTE_PRESENT(*pte))
767 dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1);
773 free_page((unsigned long)dma_dom->aperture[index]->bitmap);
775 kfree(dma_dom->aperture[index]);
776 dma_dom->aperture[index] = NULL;
781 static unsigned long dma_ops_area_alloc(struct device *dev,
782 struct dma_ops_domain *dom,
784 unsigned long align_mask,
788 unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
789 int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
790 int i = start >> APERTURE_RANGE_SHIFT;
791 unsigned long boundary_size;
792 unsigned long address = -1;
795 next_bit >>= PAGE_SHIFT;
797 boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
798 PAGE_SIZE) >> PAGE_SHIFT;
800 for (;i < max_index; ++i) {
801 unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT;
803 if (dom->aperture[i]->offset >= dma_mask)
806 limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset,
807 dma_mask >> PAGE_SHIFT);
809 address = iommu_area_alloc(dom->aperture[i]->bitmap,
810 limit, next_bit, pages, 0,
811 boundary_size, align_mask);
813 address = dom->aperture[i]->offset +
814 (address << PAGE_SHIFT);
815 dom->next_address = address + (pages << PAGE_SHIFT);
825 static unsigned long dma_ops_alloc_addresses(struct device *dev,
826 struct dma_ops_domain *dom,
828 unsigned long align_mask,
831 unsigned long address;
833 #ifdef CONFIG_IOMMU_STRESS
834 dom->next_address = 0;
835 dom->need_flush = true;
838 address = dma_ops_area_alloc(dev, dom, pages, align_mask,
839 dma_mask, dom->next_address);
842 dom->next_address = 0;
843 address = dma_ops_area_alloc(dev, dom, pages, align_mask,
845 dom->need_flush = true;
848 if (unlikely(address == -1))
849 address = bad_dma_address;
851 WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);
857 * The address free function.
859 * called with domain->lock held
861 static void dma_ops_free_addresses(struct dma_ops_domain *dom,
862 unsigned long address,
865 unsigned i = address >> APERTURE_RANGE_SHIFT;
866 struct aperture_range *range = dom->aperture[i];
868 BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
870 #ifdef CONFIG_IOMMU_STRESS
875 if (address >= dom->next_address)
876 dom->need_flush = true;
878 address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;
880 iommu_area_free(range->bitmap, address, pages);
884 /****************************************************************************
886 * The next functions belong to the domain allocation. A domain is
887 * allocated for every IOMMU as the default domain. If device isolation
888 * is enabled, every device get its own domain. The most important thing
889 * about domains is the page table mapping the DMA address space they
892 ****************************************************************************/
894 static u16 domain_id_alloc(void)
899 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
900 id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
902 if (id > 0 && id < MAX_DOMAIN_ID)
903 __set_bit(id, amd_iommu_pd_alloc_bitmap);
906 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
911 static void domain_id_free(int id)
915 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
916 if (id > 0 && id < MAX_DOMAIN_ID)
917 __clear_bit(id, amd_iommu_pd_alloc_bitmap);
918 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
922 * Used to reserve address ranges in the aperture (e.g. for exclusion
925 static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
926 unsigned long start_page,
929 unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT;
931 if (start_page + pages > last_page)
932 pages = last_page - start_page;
934 for (i = start_page; i < start_page + pages; ++i) {
935 int index = i / APERTURE_RANGE_PAGES;
936 int page = i % APERTURE_RANGE_PAGES;
937 __set_bit(page, dom->aperture[index]->bitmap);
941 static void free_pagetable(struct protection_domain *domain)
946 p1 = domain->pt_root;
951 for (i = 0; i < 512; ++i) {
952 if (!IOMMU_PTE_PRESENT(p1[i]))
955 p2 = IOMMU_PTE_PAGE(p1[i]);
956 for (j = 0; j < 512; ++j) {
957 if (!IOMMU_PTE_PRESENT(p2[j]))
959 p3 = IOMMU_PTE_PAGE(p2[j]);
960 free_page((unsigned long)p3);
963 free_page((unsigned long)p2);
966 free_page((unsigned long)p1);
968 domain->pt_root = NULL;
972 * Free a domain, only used if something went wrong in the
973 * allocation path and we need to free an already allocated page table
975 static void dma_ops_domain_free(struct dma_ops_domain *dom)
982 free_pagetable(&dom->domain);
984 for (i = 0; i < APERTURE_MAX_RANGES; ++i) {
985 if (!dom->aperture[i])
987 free_page((unsigned long)dom->aperture[i]->bitmap);
988 kfree(dom->aperture[i]);
995 * Allocates a new protection domain usable for the dma_ops functions.
996 * It also intializes the page table and the address allocator data
997 * structures required for the dma_ops interface
999 static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu)
1001 struct dma_ops_domain *dma_dom;
1003 dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
1007 spin_lock_init(&dma_dom->domain.lock);
1009 dma_dom->domain.id = domain_id_alloc();
1010 if (dma_dom->domain.id == 0)
1012 dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
1013 dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
1014 dma_dom->domain.flags = PD_DMA_OPS_MASK;
1015 dma_dom->domain.priv = dma_dom;
1016 if (!dma_dom->domain.pt_root)
1019 dma_dom->need_flush = false;
1020 dma_dom->target_dev = 0xffff;
1022 if (alloc_new_range(iommu, dma_dom, true, GFP_KERNEL))
1026 * mark the first page as allocated so we never return 0 as
1027 * a valid dma-address. So we can use 0 as error value
1029 dma_dom->aperture[0]->bitmap[0] = 1;
1030 dma_dom->next_address = 0;
1036 dma_ops_domain_free(dma_dom);
1042 * little helper function to check whether a given protection domain is a
1045 static bool dma_ops_domain(struct protection_domain *domain)
1047 return domain->flags & PD_DMA_OPS_MASK;
1051 * Find out the protection domain structure for a given PCI device. This
1052 * will give us the pointer to the page table root for example.
1054 static struct protection_domain *domain_for_device(u16 devid)
1056 struct protection_domain *dom;
1057 unsigned long flags;
1059 read_lock_irqsave(&amd_iommu_devtable_lock, flags);
1060 dom = amd_iommu_pd_table[devid];
1061 read_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1067 * If a device is not yet associated with a domain, this function does
1068 * assigns it visible for the hardware
1070 static void attach_device(struct amd_iommu *iommu,
1071 struct protection_domain *domain,
1074 unsigned long flags;
1075 u64 pte_root = virt_to_phys(domain->pt_root);
1077 domain->dev_cnt += 1;
1079 pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
1080 << DEV_ENTRY_MODE_SHIFT;
1081 pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
1083 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1084 amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root);
1085 amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root);
1086 amd_iommu_dev_table[devid].data[2] = domain->id;
1088 amd_iommu_pd_table[devid] = domain;
1089 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1092 * We might boot into a crash-kernel here. The crashed kernel
1093 * left the caches in the IOMMU dirty. So we have to flush
1094 * here to evict all dirty stuff.
1096 iommu_queue_inv_dev_entry(iommu, devid);
1097 iommu_flush_tlb_pde(iommu, domain->id);
1101 * Removes a device from a protection domain (unlocked)
1103 static void __detach_device(struct protection_domain *domain, u16 devid)
1107 spin_lock(&domain->lock);
1109 /* remove domain from the lookup table */
1110 amd_iommu_pd_table[devid] = NULL;
1112 /* remove entry from the device table seen by the hardware */
1113 amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
1114 amd_iommu_dev_table[devid].data[1] = 0;
1115 amd_iommu_dev_table[devid].data[2] = 0;
1117 /* decrease reference counter */
1118 domain->dev_cnt -= 1;
1121 spin_unlock(&domain->lock);
1125 * Removes a device from a protection domain (with devtable_lock held)
1127 static void detach_device(struct protection_domain *domain, u16 devid)
1129 unsigned long flags;
1131 /* lock device table */
1132 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1133 __detach_device(domain, devid);
1134 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1137 static int device_change_notifier(struct notifier_block *nb,
1138 unsigned long action, void *data)
1140 struct device *dev = data;
1141 struct pci_dev *pdev = to_pci_dev(dev);
1142 u16 devid = calc_devid(pdev->bus->number, pdev->devfn);
1143 struct protection_domain *domain;
1144 struct dma_ops_domain *dma_domain;
1145 struct amd_iommu *iommu;
1146 unsigned long flags;
1148 if (devid > amd_iommu_last_bdf)
1151 devid = amd_iommu_alias_table[devid];
1153 iommu = amd_iommu_rlookup_table[devid];
1157 domain = domain_for_device(devid);
1159 if (domain && !dma_ops_domain(domain))
1160 WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound "
1161 "to a non-dma-ops domain\n", dev_name(dev));
1164 case BUS_NOTIFY_UNBOUND_DRIVER:
1167 detach_device(domain, devid);
1169 case BUS_NOTIFY_ADD_DEVICE:
1170 /* allocate a protection domain if a device is added */
1171 dma_domain = find_protection_domain(devid);
1174 dma_domain = dma_ops_domain_alloc(iommu);
1177 dma_domain->target_dev = devid;
1179 spin_lock_irqsave(&iommu_pd_list_lock, flags);
1180 list_add_tail(&dma_domain->list, &iommu_pd_list);
1181 spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
1188 iommu_queue_inv_dev_entry(iommu, devid);
1189 iommu_completion_wait(iommu);
1195 struct notifier_block device_nb = {
1196 .notifier_call = device_change_notifier,
1199 /*****************************************************************************
1201 * The next functions belong to the dma_ops mapping/unmapping code.
1203 *****************************************************************************/
1206 * This function checks if the driver got a valid device from the caller to
1207 * avoid dereferencing invalid pointers.
1209 static bool check_device(struct device *dev)
1211 if (!dev || !dev->dma_mask)
1218 * In this function the list of preallocated protection domains is traversed to
1219 * find the domain for a specific device
1221 static struct dma_ops_domain *find_protection_domain(u16 devid)
1223 struct dma_ops_domain *entry, *ret = NULL;
1224 unsigned long flags;
1226 if (list_empty(&iommu_pd_list))
1229 spin_lock_irqsave(&iommu_pd_list_lock, flags);
1231 list_for_each_entry(entry, &iommu_pd_list, list) {
1232 if (entry->target_dev == devid) {
1238 spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
1244 * In the dma_ops path we only have the struct device. This function
1245 * finds the corresponding IOMMU, the protection domain and the
1246 * requestor id for a given device.
1247 * If the device is not yet associated with a domain this is also done
1250 static int get_device_resources(struct device *dev,
1251 struct amd_iommu **iommu,
1252 struct protection_domain **domain,
1255 struct dma_ops_domain *dma_dom;
1256 struct pci_dev *pcidev;
1263 if (dev->bus != &pci_bus_type)
1266 pcidev = to_pci_dev(dev);
1267 _bdf = calc_devid(pcidev->bus->number, pcidev->devfn);
1269 /* device not translated by any IOMMU in the system? */
1270 if (_bdf > amd_iommu_last_bdf)
1273 *bdf = amd_iommu_alias_table[_bdf];
1275 *iommu = amd_iommu_rlookup_table[*bdf];
1278 *domain = domain_for_device(*bdf);
1279 if (*domain == NULL) {
1280 dma_dom = find_protection_domain(*bdf);
1282 dma_dom = (*iommu)->default_dom;
1283 *domain = &dma_dom->domain;
1284 attach_device(*iommu, *domain, *bdf);
1285 DUMP_printk("Using protection domain %d for device %s\n",
1286 (*domain)->id, dev_name(dev));
1289 if (domain_for_device(_bdf) == NULL)
1290 attach_device(*iommu, *domain, _bdf);
1296 * If the pte_page is not yet allocated this function is called
1298 static u64* alloc_pte(struct protection_domain *dom,
1299 unsigned long address, u64 **pte_page, gfp_t gfp)
1303 pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(address)];
1305 if (!IOMMU_PTE_PRESENT(*pte)) {
1306 page = (u64 *)get_zeroed_page(gfp);
1309 *pte = IOMMU_L2_PDE(virt_to_phys(page));
1312 pte = IOMMU_PTE_PAGE(*pte);
1313 pte = &pte[IOMMU_PTE_L1_INDEX(address)];
1315 if (!IOMMU_PTE_PRESENT(*pte)) {
1316 page = (u64 *)get_zeroed_page(gfp);
1319 *pte = IOMMU_L1_PDE(virt_to_phys(page));
1322 pte = IOMMU_PTE_PAGE(*pte);
1327 pte = &pte[IOMMU_PTE_L0_INDEX(address)];
1333 * This function fetches the PTE for a given address in the aperture
1335 static u64* dma_ops_get_pte(struct dma_ops_domain *dom,
1336 unsigned long address)
1338 struct aperture_range *aperture;
1339 u64 *pte, *pte_page;
1341 aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
1345 pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
1347 pte = alloc_pte(&dom->domain, address, &pte_page, GFP_ATOMIC);
1348 aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page;
1350 pte += IOMMU_PTE_L0_INDEX(address);
1356 * This is the generic map function. It maps one 4kb page at paddr to
1357 * the given address in the DMA address space for the domain.
1359 static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
1360 struct dma_ops_domain *dom,
1361 unsigned long address,
1367 WARN_ON(address > dom->aperture_size);
1371 pte = dma_ops_get_pte(dom, address);
1373 return bad_dma_address;
1375 __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
1377 if (direction == DMA_TO_DEVICE)
1378 __pte |= IOMMU_PTE_IR;
1379 else if (direction == DMA_FROM_DEVICE)
1380 __pte |= IOMMU_PTE_IW;
1381 else if (direction == DMA_BIDIRECTIONAL)
1382 __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
1388 return (dma_addr_t)address;
1392 * The generic unmapping function for on page in the DMA address space.
1394 static void dma_ops_domain_unmap(struct amd_iommu *iommu,
1395 struct dma_ops_domain *dom,
1396 unsigned long address)
1398 struct aperture_range *aperture;
1401 if (address >= dom->aperture_size)
1404 aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
1408 pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
1412 pte += IOMMU_PTE_L0_INDEX(address);
1420 * This function contains common code for mapping of a physically
1421 * contiguous memory region into DMA address space. It is used by all
1422 * mapping functions provided with this IOMMU driver.
1423 * Must be called with the domain lock held.
1425 static dma_addr_t __map_single(struct device *dev,
1426 struct amd_iommu *iommu,
1427 struct dma_ops_domain *dma_dom,
1434 dma_addr_t offset = paddr & ~PAGE_MASK;
1435 dma_addr_t address, start, ret;
1437 unsigned long align_mask = 0;
1440 pages = iommu_num_pages(paddr, size, PAGE_SIZE);
1443 INC_STATS_COUNTER(total_map_requests);
1446 INC_STATS_COUNTER(cross_page);
1449 align_mask = (1UL << get_order(size)) - 1;
1452 address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,
1454 if (unlikely(address == bad_dma_address)) {
1456 * setting next_address here will let the address
1457 * allocator only scan the new allocated range in the
1458 * first run. This is a small optimization.
1460 dma_dom->next_address = dma_dom->aperture_size;
1462 if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC))
1466 * aperture was sucessfully enlarged by 128 MB, try
1473 for (i = 0; i < pages; ++i) {
1474 ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
1475 if (ret == bad_dma_address)
1483 ADD_STATS_COUNTER(alloced_io_mem, size);
1485 if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
1486 iommu_flush_tlb(iommu, dma_dom->domain.id);
1487 dma_dom->need_flush = false;
1488 } else if (unlikely(iommu_has_npcache(iommu)))
1489 iommu_flush_pages(iommu, dma_dom->domain.id, address, size);
1496 for (--i; i >= 0; --i) {
1498 dma_ops_domain_unmap(iommu, dma_dom, start);
1501 dma_ops_free_addresses(dma_dom, address, pages);
1503 return bad_dma_address;
1507 * Does the reverse of the __map_single function. Must be called with
1508 * the domain lock held too
1510 static void __unmap_single(struct amd_iommu *iommu,
1511 struct dma_ops_domain *dma_dom,
1512 dma_addr_t dma_addr,
1516 dma_addr_t i, start;
1519 if ((dma_addr == bad_dma_address) ||
1520 (dma_addr + size > dma_dom->aperture_size))
1523 pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
1524 dma_addr &= PAGE_MASK;
1527 for (i = 0; i < pages; ++i) {
1528 dma_ops_domain_unmap(iommu, dma_dom, start);
1532 SUB_STATS_COUNTER(alloced_io_mem, size);
1534 dma_ops_free_addresses(dma_dom, dma_addr, pages);
1536 if (amd_iommu_unmap_flush || dma_dom->need_flush) {
1537 iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size);
1538 dma_dom->need_flush = false;
1543 * The exported map_single function for dma_ops.
1545 static dma_addr_t map_page(struct device *dev, struct page *page,
1546 unsigned long offset, size_t size,
1547 enum dma_data_direction dir,
1548 struct dma_attrs *attrs)
1550 unsigned long flags;
1551 struct amd_iommu *iommu;
1552 struct protection_domain *domain;
1556 phys_addr_t paddr = page_to_phys(page) + offset;
1558 INC_STATS_COUNTER(cnt_map_single);
1560 if (!check_device(dev))
1561 return bad_dma_address;
1563 dma_mask = *dev->dma_mask;
1565 get_device_resources(dev, &iommu, &domain, &devid);
1567 if (iommu == NULL || domain == NULL)
1568 /* device not handled by any AMD IOMMU */
1569 return (dma_addr_t)paddr;
1571 if (!dma_ops_domain(domain))
1572 return bad_dma_address;
1574 spin_lock_irqsave(&domain->lock, flags);
1575 addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false,
1577 if (addr == bad_dma_address)
1580 iommu_completion_wait(iommu);
1583 spin_unlock_irqrestore(&domain->lock, flags);
1589 * The exported unmap_single function for dma_ops.
1591 static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
1592 enum dma_data_direction dir, struct dma_attrs *attrs)
1594 unsigned long flags;
1595 struct amd_iommu *iommu;
1596 struct protection_domain *domain;
1599 INC_STATS_COUNTER(cnt_unmap_single);
1601 if (!check_device(dev) ||
1602 !get_device_resources(dev, &iommu, &domain, &devid))
1603 /* device not handled by any AMD IOMMU */
1606 if (!dma_ops_domain(domain))
1609 spin_lock_irqsave(&domain->lock, flags);
1611 __unmap_single(iommu, domain->priv, dma_addr, size, dir);
1613 iommu_completion_wait(iommu);
1615 spin_unlock_irqrestore(&domain->lock, flags);
1619 * This is a special map_sg function which is used if we should map a
1620 * device which is not handled by an AMD IOMMU in the system.
1622 static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
1623 int nelems, int dir)
1625 struct scatterlist *s;
1628 for_each_sg(sglist, s, nelems, i) {
1629 s->dma_address = (dma_addr_t)sg_phys(s);
1630 s->dma_length = s->length;
1637 * The exported map_sg function for dma_ops (handles scatter-gather
1640 static int map_sg(struct device *dev, struct scatterlist *sglist,
1641 int nelems, enum dma_data_direction dir,
1642 struct dma_attrs *attrs)
1644 unsigned long flags;
1645 struct amd_iommu *iommu;
1646 struct protection_domain *domain;
1649 struct scatterlist *s;
1651 int mapped_elems = 0;
1654 INC_STATS_COUNTER(cnt_map_sg);
1656 if (!check_device(dev))
1659 dma_mask = *dev->dma_mask;
1661 get_device_resources(dev, &iommu, &domain, &devid);
1663 if (!iommu || !domain)
1664 return map_sg_no_iommu(dev, sglist, nelems, dir);
1666 if (!dma_ops_domain(domain))
1669 spin_lock_irqsave(&domain->lock, flags);
1671 for_each_sg(sglist, s, nelems, i) {
1674 s->dma_address = __map_single(dev, iommu, domain->priv,
1675 paddr, s->length, dir, false,
1678 if (s->dma_address) {
1679 s->dma_length = s->length;
1685 iommu_completion_wait(iommu);
1688 spin_unlock_irqrestore(&domain->lock, flags);
1690 return mapped_elems;
1692 for_each_sg(sglist, s, mapped_elems, i) {
1694 __unmap_single(iommu, domain->priv, s->dma_address,
1695 s->dma_length, dir);
1696 s->dma_address = s->dma_length = 0;
1705 * The exported map_sg function for dma_ops (handles scatter-gather
1708 static void unmap_sg(struct device *dev, struct scatterlist *sglist,
1709 int nelems, enum dma_data_direction dir,
1710 struct dma_attrs *attrs)
1712 unsigned long flags;
1713 struct amd_iommu *iommu;
1714 struct protection_domain *domain;
1715 struct scatterlist *s;
1719 INC_STATS_COUNTER(cnt_unmap_sg);
1721 if (!check_device(dev) ||
1722 !get_device_resources(dev, &iommu, &domain, &devid))
1725 if (!dma_ops_domain(domain))
1728 spin_lock_irqsave(&domain->lock, flags);
1730 for_each_sg(sglist, s, nelems, i) {
1731 __unmap_single(iommu, domain->priv, s->dma_address,
1732 s->dma_length, dir);
1733 s->dma_address = s->dma_length = 0;
1736 iommu_completion_wait(iommu);
1738 spin_unlock_irqrestore(&domain->lock, flags);
1742 * The exported alloc_coherent function for dma_ops.
1744 static void *alloc_coherent(struct device *dev, size_t size,
1745 dma_addr_t *dma_addr, gfp_t flag)
1747 unsigned long flags;
1749 struct amd_iommu *iommu;
1750 struct protection_domain *domain;
1753 u64 dma_mask = dev->coherent_dma_mask;
1755 INC_STATS_COUNTER(cnt_alloc_coherent);
1757 if (!check_device(dev))
1760 if (!get_device_resources(dev, &iommu, &domain, &devid))
1761 flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
1764 virt_addr = (void *)__get_free_pages(flag, get_order(size));
1768 paddr = virt_to_phys(virt_addr);
1770 if (!iommu || !domain) {
1771 *dma_addr = (dma_addr_t)paddr;
1775 if (!dma_ops_domain(domain))
1779 dma_mask = *dev->dma_mask;
1781 spin_lock_irqsave(&domain->lock, flags);
1783 *dma_addr = __map_single(dev, iommu, domain->priv, paddr,
1784 size, DMA_BIDIRECTIONAL, true, dma_mask);
1786 if (*dma_addr == bad_dma_address) {
1787 spin_unlock_irqrestore(&domain->lock, flags);
1791 iommu_completion_wait(iommu);
1793 spin_unlock_irqrestore(&domain->lock, flags);
1799 free_pages((unsigned long)virt_addr, get_order(size));
1805 * The exported free_coherent function for dma_ops.
1807 static void free_coherent(struct device *dev, size_t size,
1808 void *virt_addr, dma_addr_t dma_addr)
1810 unsigned long flags;
1811 struct amd_iommu *iommu;
1812 struct protection_domain *domain;
1815 INC_STATS_COUNTER(cnt_free_coherent);
1817 if (!check_device(dev))
1820 get_device_resources(dev, &iommu, &domain, &devid);
1822 if (!iommu || !domain)
1825 if (!dma_ops_domain(domain))
1828 spin_lock_irqsave(&domain->lock, flags);
1830 __unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
1832 iommu_completion_wait(iommu);
1834 spin_unlock_irqrestore(&domain->lock, flags);
1837 free_pages((unsigned long)virt_addr, get_order(size));
1841 * This function is called by the DMA layer to find out if we can handle a
1842 * particular device. It is part of the dma_ops.
1844 static int amd_iommu_dma_supported(struct device *dev, u64 mask)
1847 struct pci_dev *pcidev;
1849 /* No device or no PCI device */
1850 if (!dev || dev->bus != &pci_bus_type)
1853 pcidev = to_pci_dev(dev);
1855 bdf = calc_devid(pcidev->bus->number, pcidev->devfn);
1857 /* Out of our scope? */
1858 if (bdf > amd_iommu_last_bdf)
1865 * The function for pre-allocating protection domains.
1867 * If the driver core informs the DMA layer if a driver grabs a device
1868 * we don't need to preallocate the protection domains anymore.
1869 * For now we have to.
1871 static void prealloc_protection_domains(void)
1873 struct pci_dev *dev = NULL;
1874 struct dma_ops_domain *dma_dom;
1875 struct amd_iommu *iommu;
1878 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1879 devid = calc_devid(dev->bus->number, dev->devfn);
1880 if (devid > amd_iommu_last_bdf)
1882 devid = amd_iommu_alias_table[devid];
1883 if (domain_for_device(devid))
1885 iommu = amd_iommu_rlookup_table[devid];
1888 dma_dom = dma_ops_domain_alloc(iommu);
1891 init_unity_mappings_for_device(dma_dom, devid);
1892 dma_dom->target_dev = devid;
1894 list_add_tail(&dma_dom->list, &iommu_pd_list);
1898 static struct dma_map_ops amd_iommu_dma_ops = {
1899 .alloc_coherent = alloc_coherent,
1900 .free_coherent = free_coherent,
1901 .map_page = map_page,
1902 .unmap_page = unmap_page,
1904 .unmap_sg = unmap_sg,
1905 .dma_supported = amd_iommu_dma_supported,
1909 * The function which clues the AMD IOMMU driver into dma_ops.
1911 int __init amd_iommu_init_dma_ops(void)
1913 struct amd_iommu *iommu;
1917 * first allocate a default protection domain for every IOMMU we
1918 * found in the system. Devices not assigned to any other
1919 * protection domain will be assigned to the default one.
1921 for_each_iommu(iommu) {
1922 iommu->default_dom = dma_ops_domain_alloc(iommu);
1923 if (iommu->default_dom == NULL)
1925 iommu->default_dom->domain.flags |= PD_DEFAULT_MASK;
1926 ret = iommu_init_unity_mappings(iommu);
1932 * If device isolation is enabled, pre-allocate the protection
1933 * domains for each device.
1935 if (amd_iommu_isolate)
1936 prealloc_protection_domains();
1940 bad_dma_address = 0;
1941 #ifdef CONFIG_GART_IOMMU
1942 gart_iommu_aperture_disabled = 1;
1943 gart_iommu_aperture = 0;
1946 /* Make the driver finally visible to the drivers */
1947 dma_ops = &amd_iommu_dma_ops;
1949 register_iommu(&amd_iommu_ops);
1951 bus_register_notifier(&pci_bus_type, &device_nb);
1953 amd_iommu_stats_init();
1959 for_each_iommu(iommu) {
1960 if (iommu->default_dom)
1961 dma_ops_domain_free(iommu->default_dom);
1967 /*****************************************************************************
1969 * The following functions belong to the exported interface of AMD IOMMU
1971 * This interface allows access to lower level functions of the IOMMU
1972 * like protection domain handling and assignement of devices to domains
1973 * which is not possible with the dma_ops interface.
1975 *****************************************************************************/
1977 static void cleanup_domain(struct protection_domain *domain)
1979 unsigned long flags;
1982 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1984 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid)
1985 if (amd_iommu_pd_table[devid] == domain)
1986 __detach_device(domain, devid);
1988 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1991 static int amd_iommu_domain_init(struct iommu_domain *dom)
1993 struct protection_domain *domain;
1995 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
1999 spin_lock_init(&domain->lock);
2000 domain->mode = PAGE_MODE_3_LEVEL;
2001 domain->id = domain_id_alloc();
2004 domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
2005 if (!domain->pt_root)
2018 static void amd_iommu_domain_destroy(struct iommu_domain *dom)
2020 struct protection_domain *domain = dom->priv;
2025 if (domain->dev_cnt > 0)
2026 cleanup_domain(domain);
2028 BUG_ON(domain->dev_cnt != 0);
2030 free_pagetable(domain);
2032 domain_id_free(domain->id);
2039 static void amd_iommu_detach_device(struct iommu_domain *dom,
2042 struct protection_domain *domain = dom->priv;
2043 struct amd_iommu *iommu;
2044 struct pci_dev *pdev;
2047 if (dev->bus != &pci_bus_type)
2050 pdev = to_pci_dev(dev);
2052 devid = calc_devid(pdev->bus->number, pdev->devfn);
2055 detach_device(domain, devid);
2057 iommu = amd_iommu_rlookup_table[devid];
2061 iommu_queue_inv_dev_entry(iommu, devid);
2062 iommu_completion_wait(iommu);
2065 static int amd_iommu_attach_device(struct iommu_domain *dom,
2068 struct protection_domain *domain = dom->priv;
2069 struct protection_domain *old_domain;
2070 struct amd_iommu *iommu;
2071 struct pci_dev *pdev;
2074 if (dev->bus != &pci_bus_type)
2077 pdev = to_pci_dev(dev);
2079 devid = calc_devid(pdev->bus->number, pdev->devfn);
2081 if (devid >= amd_iommu_last_bdf ||
2082 devid != amd_iommu_alias_table[devid])
2085 iommu = amd_iommu_rlookup_table[devid];
2089 old_domain = domain_for_device(devid);
2091 detach_device(old_domain, devid);
2093 attach_device(iommu, domain, devid);
2095 iommu_completion_wait(iommu);
2100 static int amd_iommu_map_range(struct iommu_domain *dom,
2101 unsigned long iova, phys_addr_t paddr,
2102 size_t size, int iommu_prot)
2104 struct protection_domain *domain = dom->priv;
2105 unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE);
2109 if (iommu_prot & IOMMU_READ)
2110 prot |= IOMMU_PROT_IR;
2111 if (iommu_prot & IOMMU_WRITE)
2112 prot |= IOMMU_PROT_IW;
2117 for (i = 0; i < npages; ++i) {
2118 ret = iommu_map_page(domain, iova, paddr, prot);
2129 static void amd_iommu_unmap_range(struct iommu_domain *dom,
2130 unsigned long iova, size_t size)
2133 struct protection_domain *domain = dom->priv;
2134 unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE);
2138 for (i = 0; i < npages; ++i) {
2139 iommu_unmap_page(domain, iova);
2143 iommu_flush_domain(domain->id);
2146 static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
2149 struct protection_domain *domain = dom->priv;
2150 unsigned long offset = iova & ~PAGE_MASK;
2154 pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(iova)];
2156 if (!IOMMU_PTE_PRESENT(*pte))
2159 pte = IOMMU_PTE_PAGE(*pte);
2160 pte = &pte[IOMMU_PTE_L1_INDEX(iova)];
2162 if (!IOMMU_PTE_PRESENT(*pte))
2165 pte = IOMMU_PTE_PAGE(*pte);
2166 pte = &pte[IOMMU_PTE_L0_INDEX(iova)];
2168 if (!IOMMU_PTE_PRESENT(*pte))
2171 paddr = *pte & IOMMU_PAGE_MASK;
2177 static int amd_iommu_domain_has_cap(struct iommu_domain *domain,
2183 static struct iommu_ops amd_iommu_ops = {
2184 .domain_init = amd_iommu_domain_init,
2185 .domain_destroy = amd_iommu_domain_destroy,
2186 .attach_dev = amd_iommu_attach_device,
2187 .detach_dev = amd_iommu_detach_device,
2188 .map = amd_iommu_map_range,
2189 .unmap = amd_iommu_unmap_range,
2190 .iova_to_phys = amd_iommu_iova_to_phys,
2191 .domain_has_cap = amd_iommu_domain_has_cap,