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);
438 * This function is used to flush the IO/TLB for a given protection domain
439 * on every IOMMU in the system
441 static void iommu_flush_domain(u16 domid)
444 struct amd_iommu *iommu;
445 struct iommu_cmd cmd;
447 INC_STATS_COUNTER(domain_flush_all);
449 __iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
452 for_each_iommu(iommu) {
453 spin_lock_irqsave(&iommu->lock, flags);
454 __iommu_queue_command(iommu, &cmd);
455 __iommu_completion_wait(iommu);
456 __iommu_wait_for_completion(iommu);
457 spin_unlock_irqrestore(&iommu->lock, flags);
461 void amd_iommu_flush_all_domains(void)
465 for (i = 1; i < MAX_DOMAIN_ID; ++i) {
466 if (!test_bit(i, amd_iommu_pd_alloc_bitmap))
468 iommu_flush_domain(i);
472 void amd_iommu_flush_all_devices(void)
474 struct amd_iommu *iommu;
477 for (i = 0; i <= amd_iommu_last_bdf; ++i) {
478 if (amd_iommu_pd_table[i] == NULL)
481 iommu = amd_iommu_rlookup_table[i];
485 iommu_queue_inv_dev_entry(iommu, i);
486 iommu_completion_wait(iommu);
490 /****************************************************************************
492 * The functions below are used the create the page table mappings for
493 * unity mapped regions.
495 ****************************************************************************/
498 * Generic mapping functions. It maps a physical address into a DMA
499 * address space. It allocates the page table pages if necessary.
500 * In the future it can be extended to a generic mapping function
501 * supporting all features of AMD IOMMU page tables like level skipping
502 * and full 64 bit address spaces.
504 static int iommu_map_page(struct protection_domain *dom,
505 unsigned long bus_addr,
506 unsigned long phys_addr,
511 bus_addr = PAGE_ALIGN(bus_addr);
512 phys_addr = PAGE_ALIGN(phys_addr);
514 /* only support 512GB address spaces for now */
515 if (bus_addr > IOMMU_MAP_SIZE_L3 || !(prot & IOMMU_PROT_MASK))
518 pte = alloc_pte(dom, bus_addr, NULL, GFP_KERNEL);
520 if (IOMMU_PTE_PRESENT(*pte))
523 __pte = phys_addr | IOMMU_PTE_P;
524 if (prot & IOMMU_PROT_IR)
525 __pte |= IOMMU_PTE_IR;
526 if (prot & IOMMU_PROT_IW)
527 __pte |= IOMMU_PTE_IW;
534 static void iommu_unmap_page(struct protection_domain *dom,
535 unsigned long bus_addr)
539 pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];
541 if (!IOMMU_PTE_PRESENT(*pte))
544 pte = IOMMU_PTE_PAGE(*pte);
545 pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
547 if (!IOMMU_PTE_PRESENT(*pte))
550 pte = IOMMU_PTE_PAGE(*pte);
551 pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
557 * This function checks if a specific unity mapping entry is needed for
558 * this specific IOMMU.
560 static int iommu_for_unity_map(struct amd_iommu *iommu,
561 struct unity_map_entry *entry)
565 for (i = entry->devid_start; i <= entry->devid_end; ++i) {
566 bdf = amd_iommu_alias_table[i];
567 if (amd_iommu_rlookup_table[bdf] == iommu)
575 * Init the unity mappings for a specific IOMMU in the system
577 * Basically iterates over all unity mapping entries and applies them to
578 * the default domain DMA of that IOMMU if necessary.
580 static int iommu_init_unity_mappings(struct amd_iommu *iommu)
582 struct unity_map_entry *entry;
585 list_for_each_entry(entry, &amd_iommu_unity_map, list) {
586 if (!iommu_for_unity_map(iommu, entry))
588 ret = dma_ops_unity_map(iommu->default_dom, entry);
597 * This function actually applies the mapping to the page table of the
600 static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
601 struct unity_map_entry *e)
606 for (addr = e->address_start; addr < e->address_end;
608 ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot);
612 * if unity mapping is in aperture range mark the page
613 * as allocated in the aperture
615 if (addr < dma_dom->aperture_size)
616 __set_bit(addr >> PAGE_SHIFT,
617 dma_dom->aperture[0]->bitmap);
624 * Inits the unity mappings required for a specific device
626 static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
629 struct unity_map_entry *e;
632 list_for_each_entry(e, &amd_iommu_unity_map, list) {
633 if (!(devid >= e->devid_start && devid <= e->devid_end))
635 ret = dma_ops_unity_map(dma_dom, e);
643 /****************************************************************************
645 * The next functions belong to the address allocator for the dma_ops
646 * interface functions. They work like the allocators in the other IOMMU
647 * drivers. Its basically a bitmap which marks the allocated pages in
648 * the aperture. Maybe it could be enhanced in the future to a more
649 * efficient allocator.
651 ****************************************************************************/
654 * The address allocator core functions.
656 * called with domain->lock held
660 * This function checks if there is a PTE for a given dma address. If
661 * there is one, it returns the pointer to it.
663 static u64* fetch_pte(struct protection_domain *domain,
664 unsigned long address)
668 pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(address)];
670 if (!IOMMU_PTE_PRESENT(*pte))
673 pte = IOMMU_PTE_PAGE(*pte);
674 pte = &pte[IOMMU_PTE_L1_INDEX(address)];
676 if (!IOMMU_PTE_PRESENT(*pte))
679 pte = IOMMU_PTE_PAGE(*pte);
680 pte = &pte[IOMMU_PTE_L0_INDEX(address)];
686 * This function is used to add a new aperture range to an existing
687 * aperture in case of dma_ops domain allocation or address allocation
690 static int alloc_new_range(struct amd_iommu *iommu,
691 struct dma_ops_domain *dma_dom,
692 bool populate, gfp_t gfp)
694 int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT;
697 #ifdef CONFIG_IOMMU_STRESS
701 if (index >= APERTURE_MAX_RANGES)
704 dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp);
705 if (!dma_dom->aperture[index])
708 dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp);
709 if (!dma_dom->aperture[index]->bitmap)
712 dma_dom->aperture[index]->offset = dma_dom->aperture_size;
715 unsigned long address = dma_dom->aperture_size;
716 int i, num_ptes = APERTURE_RANGE_PAGES / 512;
719 for (i = 0; i < num_ptes; ++i) {
720 pte = alloc_pte(&dma_dom->domain, address,
725 dma_dom->aperture[index]->pte_pages[i] = pte_page;
727 address += APERTURE_RANGE_SIZE / 64;
731 dma_dom->aperture_size += APERTURE_RANGE_SIZE;
733 /* Intialize the exclusion range if necessary */
734 if (iommu->exclusion_start &&
735 iommu->exclusion_start >= dma_dom->aperture[index]->offset &&
736 iommu->exclusion_start < dma_dom->aperture_size) {
737 unsigned long startpage = iommu->exclusion_start >> PAGE_SHIFT;
738 int pages = iommu_num_pages(iommu->exclusion_start,
739 iommu->exclusion_length,
741 dma_ops_reserve_addresses(dma_dom, startpage, pages);
745 * Check for areas already mapped as present in the new aperture
746 * range and mark those pages as reserved in the allocator. Such
747 * mappings may already exist as a result of requested unity
748 * mappings for devices.
750 for (i = dma_dom->aperture[index]->offset;
751 i < dma_dom->aperture_size;
753 u64 *pte = fetch_pte(&dma_dom->domain, i);
754 if (!pte || !IOMMU_PTE_PRESENT(*pte))
757 dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1);
763 free_page((unsigned long)dma_dom->aperture[index]->bitmap);
765 kfree(dma_dom->aperture[index]);
766 dma_dom->aperture[index] = NULL;
771 static unsigned long dma_ops_area_alloc(struct device *dev,
772 struct dma_ops_domain *dom,
774 unsigned long align_mask,
778 unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
779 int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
780 int i = start >> APERTURE_RANGE_SHIFT;
781 unsigned long boundary_size;
782 unsigned long address = -1;
785 next_bit >>= PAGE_SHIFT;
787 boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
788 PAGE_SIZE) >> PAGE_SHIFT;
790 for (;i < max_index; ++i) {
791 unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT;
793 if (dom->aperture[i]->offset >= dma_mask)
796 limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset,
797 dma_mask >> PAGE_SHIFT);
799 address = iommu_area_alloc(dom->aperture[i]->bitmap,
800 limit, next_bit, pages, 0,
801 boundary_size, align_mask);
803 address = dom->aperture[i]->offset +
804 (address << PAGE_SHIFT);
805 dom->next_address = address + (pages << PAGE_SHIFT);
815 static unsigned long dma_ops_alloc_addresses(struct device *dev,
816 struct dma_ops_domain *dom,
818 unsigned long align_mask,
821 unsigned long address;
823 #ifdef CONFIG_IOMMU_STRESS
824 dom->next_address = 0;
825 dom->need_flush = true;
828 address = dma_ops_area_alloc(dev, dom, pages, align_mask,
829 dma_mask, dom->next_address);
832 dom->next_address = 0;
833 address = dma_ops_area_alloc(dev, dom, pages, align_mask,
835 dom->need_flush = true;
838 if (unlikely(address == -1))
839 address = bad_dma_address;
841 WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);
847 * The address free function.
849 * called with domain->lock held
851 static void dma_ops_free_addresses(struct dma_ops_domain *dom,
852 unsigned long address,
855 unsigned i = address >> APERTURE_RANGE_SHIFT;
856 struct aperture_range *range = dom->aperture[i];
858 BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
860 #ifdef CONFIG_IOMMU_STRESS
865 if (address >= dom->next_address)
866 dom->need_flush = true;
868 address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;
870 iommu_area_free(range->bitmap, address, pages);
874 /****************************************************************************
876 * The next functions belong to the domain allocation. A domain is
877 * allocated for every IOMMU as the default domain. If device isolation
878 * is enabled, every device get its own domain. The most important thing
879 * about domains is the page table mapping the DMA address space they
882 ****************************************************************************/
884 static u16 domain_id_alloc(void)
889 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
890 id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
892 if (id > 0 && id < MAX_DOMAIN_ID)
893 __set_bit(id, amd_iommu_pd_alloc_bitmap);
896 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
901 static void domain_id_free(int id)
905 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
906 if (id > 0 && id < MAX_DOMAIN_ID)
907 __clear_bit(id, amd_iommu_pd_alloc_bitmap);
908 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
912 * Used to reserve address ranges in the aperture (e.g. for exclusion
915 static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
916 unsigned long start_page,
919 unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT;
921 if (start_page + pages > last_page)
922 pages = last_page - start_page;
924 for (i = start_page; i < start_page + pages; ++i) {
925 int index = i / APERTURE_RANGE_PAGES;
926 int page = i % APERTURE_RANGE_PAGES;
927 __set_bit(page, dom->aperture[index]->bitmap);
931 static void free_pagetable(struct protection_domain *domain)
936 p1 = domain->pt_root;
941 for (i = 0; i < 512; ++i) {
942 if (!IOMMU_PTE_PRESENT(p1[i]))
945 p2 = IOMMU_PTE_PAGE(p1[i]);
946 for (j = 0; j < 512; ++j) {
947 if (!IOMMU_PTE_PRESENT(p2[j]))
949 p3 = IOMMU_PTE_PAGE(p2[j]);
950 free_page((unsigned long)p3);
953 free_page((unsigned long)p2);
956 free_page((unsigned long)p1);
958 domain->pt_root = NULL;
962 * Free a domain, only used if something went wrong in the
963 * allocation path and we need to free an already allocated page table
965 static void dma_ops_domain_free(struct dma_ops_domain *dom)
972 free_pagetable(&dom->domain);
974 for (i = 0; i < APERTURE_MAX_RANGES; ++i) {
975 if (!dom->aperture[i])
977 free_page((unsigned long)dom->aperture[i]->bitmap);
978 kfree(dom->aperture[i]);
985 * Allocates a new protection domain usable for the dma_ops functions.
986 * It also intializes the page table and the address allocator data
987 * structures required for the dma_ops interface
989 static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu)
991 struct dma_ops_domain *dma_dom;
993 dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
997 spin_lock_init(&dma_dom->domain.lock);
999 dma_dom->domain.id = domain_id_alloc();
1000 if (dma_dom->domain.id == 0)
1002 dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
1003 dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
1004 dma_dom->domain.flags = PD_DMA_OPS_MASK;
1005 dma_dom->domain.priv = dma_dom;
1006 if (!dma_dom->domain.pt_root)
1009 dma_dom->need_flush = false;
1010 dma_dom->target_dev = 0xffff;
1012 if (alloc_new_range(iommu, dma_dom, true, GFP_KERNEL))
1016 * mark the first page as allocated so we never return 0 as
1017 * a valid dma-address. So we can use 0 as error value
1019 dma_dom->aperture[0]->bitmap[0] = 1;
1020 dma_dom->next_address = 0;
1026 dma_ops_domain_free(dma_dom);
1032 * little helper function to check whether a given protection domain is a
1035 static bool dma_ops_domain(struct protection_domain *domain)
1037 return domain->flags & PD_DMA_OPS_MASK;
1041 * Find out the protection domain structure for a given PCI device. This
1042 * will give us the pointer to the page table root for example.
1044 static struct protection_domain *domain_for_device(u16 devid)
1046 struct protection_domain *dom;
1047 unsigned long flags;
1049 read_lock_irqsave(&amd_iommu_devtable_lock, flags);
1050 dom = amd_iommu_pd_table[devid];
1051 read_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1057 * If a device is not yet associated with a domain, this function does
1058 * assigns it visible for the hardware
1060 static void attach_device(struct amd_iommu *iommu,
1061 struct protection_domain *domain,
1064 unsigned long flags;
1065 u64 pte_root = virt_to_phys(domain->pt_root);
1067 domain->dev_cnt += 1;
1069 pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
1070 << DEV_ENTRY_MODE_SHIFT;
1071 pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
1073 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1074 amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root);
1075 amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root);
1076 amd_iommu_dev_table[devid].data[2] = domain->id;
1078 amd_iommu_pd_table[devid] = domain;
1079 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1081 iommu_queue_inv_dev_entry(iommu, devid);
1085 * Removes a device from a protection domain (unlocked)
1087 static void __detach_device(struct protection_domain *domain, u16 devid)
1091 spin_lock(&domain->lock);
1093 /* remove domain from the lookup table */
1094 amd_iommu_pd_table[devid] = NULL;
1096 /* remove entry from the device table seen by the hardware */
1097 amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
1098 amd_iommu_dev_table[devid].data[1] = 0;
1099 amd_iommu_dev_table[devid].data[2] = 0;
1101 /* decrease reference counter */
1102 domain->dev_cnt -= 1;
1105 spin_unlock(&domain->lock);
1109 * Removes a device from a protection domain (with devtable_lock held)
1111 static void detach_device(struct protection_domain *domain, u16 devid)
1113 unsigned long flags;
1115 /* lock device table */
1116 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1117 __detach_device(domain, devid);
1118 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1121 static int device_change_notifier(struct notifier_block *nb,
1122 unsigned long action, void *data)
1124 struct device *dev = data;
1125 struct pci_dev *pdev = to_pci_dev(dev);
1126 u16 devid = calc_devid(pdev->bus->number, pdev->devfn);
1127 struct protection_domain *domain;
1128 struct dma_ops_domain *dma_domain;
1129 struct amd_iommu *iommu;
1130 unsigned long flags;
1132 if (devid > amd_iommu_last_bdf)
1135 devid = amd_iommu_alias_table[devid];
1137 iommu = amd_iommu_rlookup_table[devid];
1141 domain = domain_for_device(devid);
1143 if (domain && !dma_ops_domain(domain))
1144 WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound "
1145 "to a non-dma-ops domain\n", dev_name(dev));
1148 case BUS_NOTIFY_UNBOUND_DRIVER:
1151 detach_device(domain, devid);
1153 case BUS_NOTIFY_ADD_DEVICE:
1154 /* allocate a protection domain if a device is added */
1155 dma_domain = find_protection_domain(devid);
1158 dma_domain = dma_ops_domain_alloc(iommu);
1161 dma_domain->target_dev = devid;
1163 spin_lock_irqsave(&iommu_pd_list_lock, flags);
1164 list_add_tail(&dma_domain->list, &iommu_pd_list);
1165 spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
1172 iommu_queue_inv_dev_entry(iommu, devid);
1173 iommu_completion_wait(iommu);
1179 struct notifier_block device_nb = {
1180 .notifier_call = device_change_notifier,
1183 /*****************************************************************************
1185 * The next functions belong to the dma_ops mapping/unmapping code.
1187 *****************************************************************************/
1190 * This function checks if the driver got a valid device from the caller to
1191 * avoid dereferencing invalid pointers.
1193 static bool check_device(struct device *dev)
1195 if (!dev || !dev->dma_mask)
1202 * In this function the list of preallocated protection domains is traversed to
1203 * find the domain for a specific device
1205 static struct dma_ops_domain *find_protection_domain(u16 devid)
1207 struct dma_ops_domain *entry, *ret = NULL;
1208 unsigned long flags;
1210 if (list_empty(&iommu_pd_list))
1213 spin_lock_irqsave(&iommu_pd_list_lock, flags);
1215 list_for_each_entry(entry, &iommu_pd_list, list) {
1216 if (entry->target_dev == devid) {
1222 spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
1228 * In the dma_ops path we only have the struct device. This function
1229 * finds the corresponding IOMMU, the protection domain and the
1230 * requestor id for a given device.
1231 * If the device is not yet associated with a domain this is also done
1234 static int get_device_resources(struct device *dev,
1235 struct amd_iommu **iommu,
1236 struct protection_domain **domain,
1239 struct dma_ops_domain *dma_dom;
1240 struct pci_dev *pcidev;
1247 if (dev->bus != &pci_bus_type)
1250 pcidev = to_pci_dev(dev);
1251 _bdf = calc_devid(pcidev->bus->number, pcidev->devfn);
1253 /* device not translated by any IOMMU in the system? */
1254 if (_bdf > amd_iommu_last_bdf)
1257 *bdf = amd_iommu_alias_table[_bdf];
1259 *iommu = amd_iommu_rlookup_table[*bdf];
1262 *domain = domain_for_device(*bdf);
1263 if (*domain == NULL) {
1264 dma_dom = find_protection_domain(*bdf);
1266 dma_dom = (*iommu)->default_dom;
1267 *domain = &dma_dom->domain;
1268 attach_device(*iommu, *domain, *bdf);
1269 DUMP_printk("Using protection domain %d for device %s\n",
1270 (*domain)->id, dev_name(dev));
1273 if (domain_for_device(_bdf) == NULL)
1274 attach_device(*iommu, *domain, _bdf);
1280 * If the pte_page is not yet allocated this function is called
1282 static u64* alloc_pte(struct protection_domain *dom,
1283 unsigned long address, u64 **pte_page, gfp_t gfp)
1287 pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(address)];
1289 if (!IOMMU_PTE_PRESENT(*pte)) {
1290 page = (u64 *)get_zeroed_page(gfp);
1293 *pte = IOMMU_L2_PDE(virt_to_phys(page));
1296 pte = IOMMU_PTE_PAGE(*pte);
1297 pte = &pte[IOMMU_PTE_L1_INDEX(address)];
1299 if (!IOMMU_PTE_PRESENT(*pte)) {
1300 page = (u64 *)get_zeroed_page(gfp);
1303 *pte = IOMMU_L1_PDE(virt_to_phys(page));
1306 pte = IOMMU_PTE_PAGE(*pte);
1311 pte = &pte[IOMMU_PTE_L0_INDEX(address)];
1317 * This function fetches the PTE for a given address in the aperture
1319 static u64* dma_ops_get_pte(struct dma_ops_domain *dom,
1320 unsigned long address)
1322 struct aperture_range *aperture;
1323 u64 *pte, *pte_page;
1325 aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
1329 pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
1331 pte = alloc_pte(&dom->domain, address, &pte_page, GFP_ATOMIC);
1332 aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page;
1334 pte += IOMMU_PTE_L0_INDEX(address);
1340 * This is the generic map function. It maps one 4kb page at paddr to
1341 * the given address in the DMA address space for the domain.
1343 static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
1344 struct dma_ops_domain *dom,
1345 unsigned long address,
1351 WARN_ON(address > dom->aperture_size);
1355 pte = dma_ops_get_pte(dom, address);
1357 return bad_dma_address;
1359 __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
1361 if (direction == DMA_TO_DEVICE)
1362 __pte |= IOMMU_PTE_IR;
1363 else if (direction == DMA_FROM_DEVICE)
1364 __pte |= IOMMU_PTE_IW;
1365 else if (direction == DMA_BIDIRECTIONAL)
1366 __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
1372 return (dma_addr_t)address;
1376 * The generic unmapping function for on page in the DMA address space.
1378 static void dma_ops_domain_unmap(struct amd_iommu *iommu,
1379 struct dma_ops_domain *dom,
1380 unsigned long address)
1382 struct aperture_range *aperture;
1385 if (address >= dom->aperture_size)
1388 aperture = dom->aperture[APERTURE_RANGE_INDEX(address)];
1392 pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)];
1396 pte += IOMMU_PTE_L0_INDEX(address);
1404 * This function contains common code for mapping of a physically
1405 * contiguous memory region into DMA address space. It is used by all
1406 * mapping functions provided with this IOMMU driver.
1407 * Must be called with the domain lock held.
1409 static dma_addr_t __map_single(struct device *dev,
1410 struct amd_iommu *iommu,
1411 struct dma_ops_domain *dma_dom,
1418 dma_addr_t offset = paddr & ~PAGE_MASK;
1419 dma_addr_t address, start, ret;
1421 unsigned long align_mask = 0;
1424 pages = iommu_num_pages(paddr, size, PAGE_SIZE);
1427 INC_STATS_COUNTER(total_map_requests);
1430 INC_STATS_COUNTER(cross_page);
1433 align_mask = (1UL << get_order(size)) - 1;
1436 address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,
1438 if (unlikely(address == bad_dma_address)) {
1440 * setting next_address here will let the address
1441 * allocator only scan the new allocated range in the
1442 * first run. This is a small optimization.
1444 dma_dom->next_address = dma_dom->aperture_size;
1446 if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC))
1450 * aperture was sucessfully enlarged by 128 MB, try
1457 for (i = 0; i < pages; ++i) {
1458 ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
1459 if (ret == bad_dma_address)
1467 ADD_STATS_COUNTER(alloced_io_mem, size);
1469 if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
1470 iommu_flush_tlb(iommu, dma_dom->domain.id);
1471 dma_dom->need_flush = false;
1472 } else if (unlikely(iommu_has_npcache(iommu)))
1473 iommu_flush_pages(iommu, dma_dom->domain.id, address, size);
1480 for (--i; i >= 0; --i) {
1482 dma_ops_domain_unmap(iommu, dma_dom, start);
1485 dma_ops_free_addresses(dma_dom, address, pages);
1487 return bad_dma_address;
1491 * Does the reverse of the __map_single function. Must be called with
1492 * the domain lock held too
1494 static void __unmap_single(struct amd_iommu *iommu,
1495 struct dma_ops_domain *dma_dom,
1496 dma_addr_t dma_addr,
1500 dma_addr_t i, start;
1503 if ((dma_addr == bad_dma_address) ||
1504 (dma_addr + size > dma_dom->aperture_size))
1507 pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
1508 dma_addr &= PAGE_MASK;
1511 for (i = 0; i < pages; ++i) {
1512 dma_ops_domain_unmap(iommu, dma_dom, start);
1516 SUB_STATS_COUNTER(alloced_io_mem, size);
1518 dma_ops_free_addresses(dma_dom, dma_addr, pages);
1520 if (amd_iommu_unmap_flush || dma_dom->need_flush) {
1521 iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size);
1522 dma_dom->need_flush = false;
1527 * The exported map_single function for dma_ops.
1529 static dma_addr_t map_page(struct device *dev, struct page *page,
1530 unsigned long offset, size_t size,
1531 enum dma_data_direction dir,
1532 struct dma_attrs *attrs)
1534 unsigned long flags;
1535 struct amd_iommu *iommu;
1536 struct protection_domain *domain;
1540 phys_addr_t paddr = page_to_phys(page) + offset;
1542 INC_STATS_COUNTER(cnt_map_single);
1544 if (!check_device(dev))
1545 return bad_dma_address;
1547 dma_mask = *dev->dma_mask;
1549 get_device_resources(dev, &iommu, &domain, &devid);
1551 if (iommu == NULL || domain == NULL)
1552 /* device not handled by any AMD IOMMU */
1553 return (dma_addr_t)paddr;
1555 if (!dma_ops_domain(domain))
1556 return bad_dma_address;
1558 spin_lock_irqsave(&domain->lock, flags);
1559 addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false,
1561 if (addr == bad_dma_address)
1564 iommu_completion_wait(iommu);
1567 spin_unlock_irqrestore(&domain->lock, flags);
1573 * The exported unmap_single function for dma_ops.
1575 static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
1576 enum dma_data_direction dir, struct dma_attrs *attrs)
1578 unsigned long flags;
1579 struct amd_iommu *iommu;
1580 struct protection_domain *domain;
1583 INC_STATS_COUNTER(cnt_unmap_single);
1585 if (!check_device(dev) ||
1586 !get_device_resources(dev, &iommu, &domain, &devid))
1587 /* device not handled by any AMD IOMMU */
1590 if (!dma_ops_domain(domain))
1593 spin_lock_irqsave(&domain->lock, flags);
1595 __unmap_single(iommu, domain->priv, dma_addr, size, dir);
1597 iommu_completion_wait(iommu);
1599 spin_unlock_irqrestore(&domain->lock, flags);
1603 * This is a special map_sg function which is used if we should map a
1604 * device which is not handled by an AMD IOMMU in the system.
1606 static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist,
1607 int nelems, int dir)
1609 struct scatterlist *s;
1612 for_each_sg(sglist, s, nelems, i) {
1613 s->dma_address = (dma_addr_t)sg_phys(s);
1614 s->dma_length = s->length;
1621 * The exported map_sg function for dma_ops (handles scatter-gather
1624 static int map_sg(struct device *dev, struct scatterlist *sglist,
1625 int nelems, enum dma_data_direction dir,
1626 struct dma_attrs *attrs)
1628 unsigned long flags;
1629 struct amd_iommu *iommu;
1630 struct protection_domain *domain;
1633 struct scatterlist *s;
1635 int mapped_elems = 0;
1638 INC_STATS_COUNTER(cnt_map_sg);
1640 if (!check_device(dev))
1643 dma_mask = *dev->dma_mask;
1645 get_device_resources(dev, &iommu, &domain, &devid);
1647 if (!iommu || !domain)
1648 return map_sg_no_iommu(dev, sglist, nelems, dir);
1650 if (!dma_ops_domain(domain))
1653 spin_lock_irqsave(&domain->lock, flags);
1655 for_each_sg(sglist, s, nelems, i) {
1658 s->dma_address = __map_single(dev, iommu, domain->priv,
1659 paddr, s->length, dir, false,
1662 if (s->dma_address) {
1663 s->dma_length = s->length;
1669 iommu_completion_wait(iommu);
1672 spin_unlock_irqrestore(&domain->lock, flags);
1674 return mapped_elems;
1676 for_each_sg(sglist, s, mapped_elems, i) {
1678 __unmap_single(iommu, domain->priv, s->dma_address,
1679 s->dma_length, dir);
1680 s->dma_address = s->dma_length = 0;
1689 * The exported map_sg function for dma_ops (handles scatter-gather
1692 static void unmap_sg(struct device *dev, struct scatterlist *sglist,
1693 int nelems, enum dma_data_direction dir,
1694 struct dma_attrs *attrs)
1696 unsigned long flags;
1697 struct amd_iommu *iommu;
1698 struct protection_domain *domain;
1699 struct scatterlist *s;
1703 INC_STATS_COUNTER(cnt_unmap_sg);
1705 if (!check_device(dev) ||
1706 !get_device_resources(dev, &iommu, &domain, &devid))
1709 if (!dma_ops_domain(domain))
1712 spin_lock_irqsave(&domain->lock, flags);
1714 for_each_sg(sglist, s, nelems, i) {
1715 __unmap_single(iommu, domain->priv, s->dma_address,
1716 s->dma_length, dir);
1717 s->dma_address = s->dma_length = 0;
1720 iommu_completion_wait(iommu);
1722 spin_unlock_irqrestore(&domain->lock, flags);
1726 * The exported alloc_coherent function for dma_ops.
1728 static void *alloc_coherent(struct device *dev, size_t size,
1729 dma_addr_t *dma_addr, gfp_t flag)
1731 unsigned long flags;
1733 struct amd_iommu *iommu;
1734 struct protection_domain *domain;
1737 u64 dma_mask = dev->coherent_dma_mask;
1739 INC_STATS_COUNTER(cnt_alloc_coherent);
1741 if (!check_device(dev))
1744 if (!get_device_resources(dev, &iommu, &domain, &devid))
1745 flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
1748 virt_addr = (void *)__get_free_pages(flag, get_order(size));
1752 paddr = virt_to_phys(virt_addr);
1754 if (!iommu || !domain) {
1755 *dma_addr = (dma_addr_t)paddr;
1759 if (!dma_ops_domain(domain))
1763 dma_mask = *dev->dma_mask;
1765 spin_lock_irqsave(&domain->lock, flags);
1767 *dma_addr = __map_single(dev, iommu, domain->priv, paddr,
1768 size, DMA_BIDIRECTIONAL, true, dma_mask);
1770 if (*dma_addr == bad_dma_address) {
1771 spin_unlock_irqrestore(&domain->lock, flags);
1775 iommu_completion_wait(iommu);
1777 spin_unlock_irqrestore(&domain->lock, flags);
1783 free_pages((unsigned long)virt_addr, get_order(size));
1789 * The exported free_coherent function for dma_ops.
1791 static void free_coherent(struct device *dev, size_t size,
1792 void *virt_addr, dma_addr_t dma_addr)
1794 unsigned long flags;
1795 struct amd_iommu *iommu;
1796 struct protection_domain *domain;
1799 INC_STATS_COUNTER(cnt_free_coherent);
1801 if (!check_device(dev))
1804 get_device_resources(dev, &iommu, &domain, &devid);
1806 if (!iommu || !domain)
1809 if (!dma_ops_domain(domain))
1812 spin_lock_irqsave(&domain->lock, flags);
1814 __unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
1816 iommu_completion_wait(iommu);
1818 spin_unlock_irqrestore(&domain->lock, flags);
1821 free_pages((unsigned long)virt_addr, get_order(size));
1825 * This function is called by the DMA layer to find out if we can handle a
1826 * particular device. It is part of the dma_ops.
1828 static int amd_iommu_dma_supported(struct device *dev, u64 mask)
1831 struct pci_dev *pcidev;
1833 /* No device or no PCI device */
1834 if (!dev || dev->bus != &pci_bus_type)
1837 pcidev = to_pci_dev(dev);
1839 bdf = calc_devid(pcidev->bus->number, pcidev->devfn);
1841 /* Out of our scope? */
1842 if (bdf > amd_iommu_last_bdf)
1849 * The function for pre-allocating protection domains.
1851 * If the driver core informs the DMA layer if a driver grabs a device
1852 * we don't need to preallocate the protection domains anymore.
1853 * For now we have to.
1855 static void prealloc_protection_domains(void)
1857 struct pci_dev *dev = NULL;
1858 struct dma_ops_domain *dma_dom;
1859 struct amd_iommu *iommu;
1862 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1863 devid = calc_devid(dev->bus->number, dev->devfn);
1864 if (devid > amd_iommu_last_bdf)
1866 devid = amd_iommu_alias_table[devid];
1867 if (domain_for_device(devid))
1869 iommu = amd_iommu_rlookup_table[devid];
1872 dma_dom = dma_ops_domain_alloc(iommu);
1875 init_unity_mappings_for_device(dma_dom, devid);
1876 dma_dom->target_dev = devid;
1878 list_add_tail(&dma_dom->list, &iommu_pd_list);
1882 static struct dma_map_ops amd_iommu_dma_ops = {
1883 .alloc_coherent = alloc_coherent,
1884 .free_coherent = free_coherent,
1885 .map_page = map_page,
1886 .unmap_page = unmap_page,
1888 .unmap_sg = unmap_sg,
1889 .dma_supported = amd_iommu_dma_supported,
1893 * The function which clues the AMD IOMMU driver into dma_ops.
1895 int __init amd_iommu_init_dma_ops(void)
1897 struct amd_iommu *iommu;
1901 * first allocate a default protection domain for every IOMMU we
1902 * found in the system. Devices not assigned to any other
1903 * protection domain will be assigned to the default one.
1905 for_each_iommu(iommu) {
1906 iommu->default_dom = dma_ops_domain_alloc(iommu);
1907 if (iommu->default_dom == NULL)
1909 iommu->default_dom->domain.flags |= PD_DEFAULT_MASK;
1910 ret = iommu_init_unity_mappings(iommu);
1916 * If device isolation is enabled, pre-allocate the protection
1917 * domains for each device.
1919 if (amd_iommu_isolate)
1920 prealloc_protection_domains();
1924 bad_dma_address = 0;
1925 #ifdef CONFIG_GART_IOMMU
1926 gart_iommu_aperture_disabled = 1;
1927 gart_iommu_aperture = 0;
1930 /* Make the driver finally visible to the drivers */
1931 dma_ops = &amd_iommu_dma_ops;
1933 register_iommu(&amd_iommu_ops);
1935 bus_register_notifier(&pci_bus_type, &device_nb);
1937 amd_iommu_stats_init();
1943 for_each_iommu(iommu) {
1944 if (iommu->default_dom)
1945 dma_ops_domain_free(iommu->default_dom);
1951 /*****************************************************************************
1953 * The following functions belong to the exported interface of AMD IOMMU
1955 * This interface allows access to lower level functions of the IOMMU
1956 * like protection domain handling and assignement of devices to domains
1957 * which is not possible with the dma_ops interface.
1959 *****************************************************************************/
1961 static void cleanup_domain(struct protection_domain *domain)
1963 unsigned long flags;
1966 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1968 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid)
1969 if (amd_iommu_pd_table[devid] == domain)
1970 __detach_device(domain, devid);
1972 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1975 static int amd_iommu_domain_init(struct iommu_domain *dom)
1977 struct protection_domain *domain;
1979 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
1983 spin_lock_init(&domain->lock);
1984 domain->mode = PAGE_MODE_3_LEVEL;
1985 domain->id = domain_id_alloc();
1988 domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
1989 if (!domain->pt_root)
2002 static void amd_iommu_domain_destroy(struct iommu_domain *dom)
2004 struct protection_domain *domain = dom->priv;
2009 if (domain->dev_cnt > 0)
2010 cleanup_domain(domain);
2012 BUG_ON(domain->dev_cnt != 0);
2014 free_pagetable(domain);
2016 domain_id_free(domain->id);
2023 static void amd_iommu_detach_device(struct iommu_domain *dom,
2026 struct protection_domain *domain = dom->priv;
2027 struct amd_iommu *iommu;
2028 struct pci_dev *pdev;
2031 if (dev->bus != &pci_bus_type)
2034 pdev = to_pci_dev(dev);
2036 devid = calc_devid(pdev->bus->number, pdev->devfn);
2039 detach_device(domain, devid);
2041 iommu = amd_iommu_rlookup_table[devid];
2045 iommu_queue_inv_dev_entry(iommu, devid);
2046 iommu_completion_wait(iommu);
2049 static int amd_iommu_attach_device(struct iommu_domain *dom,
2052 struct protection_domain *domain = dom->priv;
2053 struct protection_domain *old_domain;
2054 struct amd_iommu *iommu;
2055 struct pci_dev *pdev;
2058 if (dev->bus != &pci_bus_type)
2061 pdev = to_pci_dev(dev);
2063 devid = calc_devid(pdev->bus->number, pdev->devfn);
2065 if (devid >= amd_iommu_last_bdf ||
2066 devid != amd_iommu_alias_table[devid])
2069 iommu = amd_iommu_rlookup_table[devid];
2073 old_domain = domain_for_device(devid);
2075 detach_device(old_domain, devid);
2077 attach_device(iommu, domain, devid);
2079 iommu_completion_wait(iommu);
2084 static int amd_iommu_map_range(struct iommu_domain *dom,
2085 unsigned long iova, phys_addr_t paddr,
2086 size_t size, int iommu_prot)
2088 struct protection_domain *domain = dom->priv;
2089 unsigned long i, npages = iommu_num_pages(paddr, size, PAGE_SIZE);
2093 if (iommu_prot & IOMMU_READ)
2094 prot |= IOMMU_PROT_IR;
2095 if (iommu_prot & IOMMU_WRITE)
2096 prot |= IOMMU_PROT_IW;
2101 for (i = 0; i < npages; ++i) {
2102 ret = iommu_map_page(domain, iova, paddr, prot);
2113 static void amd_iommu_unmap_range(struct iommu_domain *dom,
2114 unsigned long iova, size_t size)
2117 struct protection_domain *domain = dom->priv;
2118 unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE);
2122 for (i = 0; i < npages; ++i) {
2123 iommu_unmap_page(domain, iova);
2127 iommu_flush_domain(domain->id);
2130 static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
2133 struct protection_domain *domain = dom->priv;
2134 unsigned long offset = iova & ~PAGE_MASK;
2138 pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(iova)];
2140 if (!IOMMU_PTE_PRESENT(*pte))
2143 pte = IOMMU_PTE_PAGE(*pte);
2144 pte = &pte[IOMMU_PTE_L1_INDEX(iova)];
2146 if (!IOMMU_PTE_PRESENT(*pte))
2149 pte = IOMMU_PTE_PAGE(*pte);
2150 pte = &pte[IOMMU_PTE_L0_INDEX(iova)];
2152 if (!IOMMU_PTE_PRESENT(*pte))
2155 paddr = *pte & IOMMU_PAGE_MASK;
2161 static int amd_iommu_domain_has_cap(struct iommu_domain *domain,
2167 static struct iommu_ops amd_iommu_ops = {
2168 .domain_init = amd_iommu_domain_init,
2169 .domain_destroy = amd_iommu_domain_destroy,
2170 .attach_dev = amd_iommu_attach_device,
2171 .detach_dev = amd_iommu_detach_device,
2172 .map = amd_iommu_map_range,
2173 .unmap = amd_iommu_unmap_range,
2174 .iova_to_phys = amd_iommu_iova_to_phys,
2175 .domain_has_cap = amd_iommu_domain_has_cap,