2 * Copyright © 2006-2014 Intel Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * Authors: David Woodhouse <dwmw2@infradead.org>,
14 * Ashok Raj <ashok.raj@intel.com>,
15 * Shaohua Li <shaohua.li@intel.com>,
16 * Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
17 * Fenghua Yu <fenghua.yu@intel.com>
18 * Joerg Roedel <jroedel@suse.de>
21 #define pr_fmt(fmt) "DMAR: " fmt
23 #include <linux/init.h>
24 #include <linux/bitmap.h>
25 #include <linux/debugfs.h>
26 #include <linux/export.h>
27 #include <linux/slab.h>
28 #include <linux/irq.h>
29 #include <linux/interrupt.h>
30 #include <linux/spinlock.h>
31 #include <linux/pci.h>
32 #include <linux/dmar.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/mempool.h>
35 #include <linux/memory.h>
36 #include <linux/cpu.h>
37 #include <linux/timer.h>
39 #include <linux/iova.h>
40 #include <linux/iommu.h>
41 #include <linux/intel-iommu.h>
42 #include <linux/syscore_ops.h>
43 #include <linux/tboot.h>
44 #include <linux/dmi.h>
45 #include <linux/pci-ats.h>
46 #include <linux/memblock.h>
47 #include <linux/dma-contiguous.h>
48 #include <linux/crash_dump.h>
49 #include <asm/irq_remapping.h>
50 #include <asm/cacheflush.h>
51 #include <asm/iommu.h>
53 #include "irq_remapping.h"
55 #define ROOT_SIZE VTD_PAGE_SIZE
56 #define CONTEXT_SIZE VTD_PAGE_SIZE
58 #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
59 #define IS_USB_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB)
60 #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
61 #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
63 #define IOAPIC_RANGE_START (0xfee00000)
64 #define IOAPIC_RANGE_END (0xfeefffff)
65 #define IOVA_START_ADDR (0x1000)
67 #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
69 #define MAX_AGAW_WIDTH 64
70 #define MAX_AGAW_PFN_WIDTH (MAX_AGAW_WIDTH - VTD_PAGE_SHIFT)
72 #define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << (gaw-VTD_PAGE_SHIFT)) - 1)
73 #define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << gaw) - 1)
75 /* We limit DOMAIN_MAX_PFN to fit in an unsigned long, and DOMAIN_MAX_ADDR
76 to match. That way, we can use 'unsigned long' for PFNs with impunity. */
77 #define DOMAIN_MAX_PFN(gaw) ((unsigned long) min_t(uint64_t, \
78 __DOMAIN_MAX_PFN(gaw), (unsigned long)-1))
79 #define DOMAIN_MAX_ADDR(gaw) (((uint64_t)__DOMAIN_MAX_PFN(gaw)) << VTD_PAGE_SHIFT)
81 /* IO virtual address start page frame number */
82 #define IOVA_START_PFN (1)
84 #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
85 #define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32))
86 #define DMA_64BIT_PFN IOVA_PFN(DMA_BIT_MASK(64))
88 /* page table handling */
89 #define LEVEL_STRIDE (9)
90 #define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1)
93 * This bitmap is used to advertise the page sizes our hardware support
94 * to the IOMMU core, which will then use this information to split
95 * physically contiguous memory regions it is mapping into page sizes
98 * Traditionally the IOMMU core just handed us the mappings directly,
99 * after making sure the size is an order of a 4KiB page and that the
100 * mapping has natural alignment.
102 * To retain this behavior, we currently advertise that we support
103 * all page sizes that are an order of 4KiB.
105 * If at some point we'd like to utilize the IOMMU core's new behavior,
106 * we could change this to advertise the real page sizes we support.
108 #define INTEL_IOMMU_PGSIZES (~0xFFFUL)
110 static inline int agaw_to_level(int agaw)
115 static inline int agaw_to_width(int agaw)
117 return min_t(int, 30 + agaw * LEVEL_STRIDE, MAX_AGAW_WIDTH);
120 static inline int width_to_agaw(int width)
122 return DIV_ROUND_UP(width - 30, LEVEL_STRIDE);
125 static inline unsigned int level_to_offset_bits(int level)
127 return (level - 1) * LEVEL_STRIDE;
130 static inline int pfn_level_offset(unsigned long pfn, int level)
132 return (pfn >> level_to_offset_bits(level)) & LEVEL_MASK;
135 static inline unsigned long level_mask(int level)
137 return -1UL << level_to_offset_bits(level);
140 static inline unsigned long level_size(int level)
142 return 1UL << level_to_offset_bits(level);
145 static inline unsigned long align_to_level(unsigned long pfn, int level)
147 return (pfn + level_size(level) - 1) & level_mask(level);
150 static inline unsigned long lvl_to_nr_pages(unsigned int lvl)
152 return 1 << min_t(int, (lvl - 1) * LEVEL_STRIDE, MAX_AGAW_PFN_WIDTH);
155 /* VT-d pages must always be _smaller_ than MM pages. Otherwise things
156 are never going to work. */
157 static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn)
159 return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT);
162 static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn)
164 return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT);
166 static inline unsigned long page_to_dma_pfn(struct page *pg)
168 return mm_to_dma_pfn(page_to_pfn(pg));
170 static inline unsigned long virt_to_dma_pfn(void *p)
172 return page_to_dma_pfn(virt_to_page(p));
175 /* global iommu list, set NULL for ignored DMAR units */
176 static struct intel_iommu **g_iommus;
178 static void __init check_tylersburg_isoch(void);
179 static int rwbf_quirk;
182 * set to 1 to panic kernel if can't successfully enable VT-d
183 * (used when kernel is launched w/ TXT)
185 static int force_on = 0;
190 * 12-63: Context Ptr (12 - (haw-1))
197 #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
200 * Take a root_entry and return the Lower Context Table Pointer (LCTP)
203 static phys_addr_t root_entry_lctp(struct root_entry *re)
208 return re->lo & VTD_PAGE_MASK;
212 * Take a root_entry and return the Upper Context Table Pointer (UCTP)
215 static phys_addr_t root_entry_uctp(struct root_entry *re)
220 return re->hi & VTD_PAGE_MASK;
225 * 1: fault processing disable
226 * 2-3: translation type
227 * 12-63: address space root
233 struct context_entry {
238 static inline void context_clear_pasid_enable(struct context_entry *context)
240 context->lo &= ~(1ULL << 11);
243 static inline bool context_pasid_enabled(struct context_entry *context)
245 return !!(context->lo & (1ULL << 11));
248 static inline void context_set_copied(struct context_entry *context)
250 context->hi |= (1ull << 3);
253 static inline bool context_copied(struct context_entry *context)
255 return !!(context->hi & (1ULL << 3));
258 static inline bool __context_present(struct context_entry *context)
260 return (context->lo & 1);
263 static inline bool context_present(struct context_entry *context)
265 return context_pasid_enabled(context) ?
266 __context_present(context) :
267 __context_present(context) && !context_copied(context);
270 static inline void context_set_present(struct context_entry *context)
275 static inline void context_set_fault_enable(struct context_entry *context)
277 context->lo &= (((u64)-1) << 2) | 1;
280 static inline void context_set_translation_type(struct context_entry *context,
283 context->lo &= (((u64)-1) << 4) | 3;
284 context->lo |= (value & 3) << 2;
287 static inline void context_set_address_root(struct context_entry *context,
290 context->lo &= ~VTD_PAGE_MASK;
291 context->lo |= value & VTD_PAGE_MASK;
294 static inline void context_set_address_width(struct context_entry *context,
297 context->hi |= value & 7;
300 static inline void context_set_domain_id(struct context_entry *context,
303 context->hi |= (value & ((1 << 16) - 1)) << 8;
306 static inline int context_domain_id(struct context_entry *c)
308 return((c->hi >> 8) & 0xffff);
311 static inline void context_clear_entry(struct context_entry *context)
324 * 12-63: Host physcial address
330 static inline void dma_clear_pte(struct dma_pte *pte)
335 static inline u64 dma_pte_addr(struct dma_pte *pte)
338 return pte->val & VTD_PAGE_MASK;
340 /* Must have a full atomic 64-bit read */
341 return __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK;
345 static inline bool dma_pte_present(struct dma_pte *pte)
347 return (pte->val & 3) != 0;
350 static inline bool dma_pte_superpage(struct dma_pte *pte)
352 return (pte->val & DMA_PTE_LARGE_PAGE);
355 static inline int first_pte_in_page(struct dma_pte *pte)
357 return !((unsigned long)pte & ~VTD_PAGE_MASK);
361 * This domain is a statically identity mapping domain.
362 * 1. This domain creats a static 1:1 mapping to all usable memory.
363 * 2. It maps to each iommu if successful.
364 * 3. Each iommu mapps to this domain if successful.
366 static struct dmar_domain *si_domain;
367 static int hw_pass_through = 1;
370 * Domain represents a virtual machine, more than one devices
371 * across iommus may be owned in one domain, e.g. kvm guest.
373 #define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 0)
375 /* si_domain contains mulitple devices */
376 #define DOMAIN_FLAG_STATIC_IDENTITY (1 << 1)
378 #define for_each_domain_iommu(idx, domain) \
379 for (idx = 0; idx < g_num_of_iommus; idx++) \
380 if (domain->iommu_refcnt[idx])
383 int nid; /* node id */
385 unsigned iommu_refcnt[DMAR_UNITS_SUPPORTED];
386 /* Refcount of devices per iommu */
389 u16 iommu_did[DMAR_UNITS_SUPPORTED];
390 /* Domain ids per IOMMU. Use u16 since
391 * domain ids are 16 bit wide according
392 * to VT-d spec, section 9.3 */
394 bool has_iotlb_device;
395 struct list_head devices; /* all devices' list */
396 struct iova_domain iovad; /* iova's that belong to this domain */
398 struct dma_pte *pgd; /* virtual address */
399 int gaw; /* max guest address width */
401 /* adjusted guest address width, 0 is level 2 30-bit */
404 int flags; /* flags to find out type of domain */
406 int iommu_coherency;/* indicate coherency of iommu access */
407 int iommu_snooping; /* indicate snooping control feature*/
408 int iommu_count; /* reference count of iommu */
409 int iommu_superpage;/* Level of superpages supported:
410 0 == 4KiB (no superpages), 1 == 2MiB,
411 2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
412 u64 max_addr; /* maximum mapped address */
414 struct iommu_domain domain; /* generic domain data structure for
418 /* PCI domain-device relationship */
419 struct device_domain_info {
420 struct list_head link; /* link to domain siblings */
421 struct list_head global; /* link to global list */
422 u8 bus; /* PCI bus number */
423 u8 devfn; /* PCI devfn number */
424 u8 pasid_supported:3;
431 struct device *dev; /* it's NULL for PCIe-to-PCI bridge */
432 struct intel_iommu *iommu; /* IOMMU used by this device */
433 struct dmar_domain *domain; /* pointer to domain */
436 struct dmar_rmrr_unit {
437 struct list_head list; /* list of rmrr units */
438 struct acpi_dmar_header *hdr; /* ACPI header */
439 u64 base_address; /* reserved base address*/
440 u64 end_address; /* reserved end address */
441 struct dmar_dev_scope *devices; /* target devices */
442 int devices_cnt; /* target device count */
445 struct dmar_atsr_unit {
446 struct list_head list; /* list of ATSR units */
447 struct acpi_dmar_header *hdr; /* ACPI header */
448 struct dmar_dev_scope *devices; /* target devices */
449 int devices_cnt; /* target device count */
450 u8 include_all:1; /* include all ports */
453 static LIST_HEAD(dmar_atsr_units);
454 static LIST_HEAD(dmar_rmrr_units);
456 #define for_each_rmrr_units(rmrr) \
457 list_for_each_entry(rmrr, &dmar_rmrr_units, list)
459 static void flush_unmaps_timeout(unsigned long data);
461 struct deferred_flush_entry {
462 unsigned long iova_pfn;
463 unsigned long nrpages;
464 struct dmar_domain *domain;
465 struct page *freelist;
468 #define HIGH_WATER_MARK 250
469 struct deferred_flush_table {
471 struct deferred_flush_entry entries[HIGH_WATER_MARK];
474 struct deferred_flush_data {
477 struct timer_list timer;
479 struct deferred_flush_table *tables;
482 DEFINE_PER_CPU(struct deferred_flush_data, deferred_flush);
484 /* bitmap for indexing intel_iommus */
485 static int g_num_of_iommus;
487 static void domain_exit(struct dmar_domain *domain);
488 static void domain_remove_dev_info(struct dmar_domain *domain);
489 static void dmar_remove_one_dev_info(struct dmar_domain *domain,
491 static void __dmar_remove_one_dev_info(struct device_domain_info *info);
492 static void domain_context_clear(struct intel_iommu *iommu,
494 static int domain_detach_iommu(struct dmar_domain *domain,
495 struct intel_iommu *iommu);
497 #ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON
498 int dmar_disabled = 0;
500 int dmar_disabled = 1;
501 #endif /*CONFIG_INTEL_IOMMU_DEFAULT_ON*/
503 int intel_iommu_enabled = 0;
504 EXPORT_SYMBOL_GPL(intel_iommu_enabled);
506 static int dmar_map_gfx = 1;
507 static int dmar_forcedac;
508 static int intel_iommu_strict;
509 static int intel_iommu_superpage = 1;
510 static int intel_iommu_ecs = 1;
511 static int intel_iommu_pasid28;
512 static int iommu_identity_mapping;
514 #define IDENTMAP_ALL 1
515 #define IDENTMAP_GFX 2
516 #define IDENTMAP_AZALIA 4
518 /* Broadwell and Skylake have broken ECS support — normal so-called "second
519 * level" translation of DMA requests-without-PASID doesn't actually happen
520 * unless you also set the NESTE bit in an extended context-entry. Which of
521 * course means that SVM doesn't work because it's trying to do nested
522 * translation of the physical addresses it finds in the process page tables,
523 * through the IOVA->phys mapping found in the "second level" page tables.
525 * The VT-d specification was retroactively changed to change the definition
526 * of the capability bits and pretend that Broadwell/Skylake never happened...
527 * but unfortunately the wrong bit was changed. It's ECS which is broken, but
528 * for some reason it was the PASID capability bit which was redefined (from
529 * bit 28 on BDW/SKL to bit 40 in future).
531 * So our test for ECS needs to eschew those implementations which set the old
532 * PASID capabiity bit 28, since those are the ones on which ECS is broken.
533 * Unless we are working around the 'pasid28' limitations, that is, by putting
534 * the device into passthrough mode for normal DMA and thus masking the bug.
536 #define ecs_enabled(iommu) (intel_iommu_ecs && ecap_ecs(iommu->ecap) && \
537 (intel_iommu_pasid28 || !ecap_broken_pasid(iommu->ecap)))
538 /* PASID support is thus enabled if ECS is enabled and *either* of the old
539 * or new capability bits are set. */
540 #define pasid_enabled(iommu) (ecs_enabled(iommu) && \
541 (ecap_pasid(iommu->ecap) || ecap_broken_pasid(iommu->ecap)))
543 int intel_iommu_gfx_mapped;
544 EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped);
546 #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1))
547 static DEFINE_SPINLOCK(device_domain_lock);
548 static LIST_HEAD(device_domain_list);
550 static const struct iommu_ops intel_iommu_ops;
552 static bool translation_pre_enabled(struct intel_iommu *iommu)
554 return (iommu->flags & VTD_FLAG_TRANS_PRE_ENABLED);
557 static void clear_translation_pre_enabled(struct intel_iommu *iommu)
559 iommu->flags &= ~VTD_FLAG_TRANS_PRE_ENABLED;
562 static void init_translation_status(struct intel_iommu *iommu)
566 gsts = readl(iommu->reg + DMAR_GSTS_REG);
567 if (gsts & DMA_GSTS_TES)
568 iommu->flags |= VTD_FLAG_TRANS_PRE_ENABLED;
571 /* Convert generic 'struct iommu_domain to private struct dmar_domain */
572 static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom)
574 return container_of(dom, struct dmar_domain, domain);
577 static int __init intel_iommu_setup(char *str)
582 if (!strncmp(str, "on", 2)) {
584 pr_info("IOMMU enabled\n");
585 } else if (!strncmp(str, "off", 3)) {
587 pr_info("IOMMU disabled\n");
588 } else if (!strncmp(str, "igfx_off", 8)) {
590 pr_info("Disable GFX device mapping\n");
591 } else if (!strncmp(str, "forcedac", 8)) {
592 pr_info("Forcing DAC for PCI devices\n");
594 } else if (!strncmp(str, "strict", 6)) {
595 pr_info("Disable batched IOTLB flush\n");
596 intel_iommu_strict = 1;
597 } else if (!strncmp(str, "sp_off", 6)) {
598 pr_info("Disable supported super page\n");
599 intel_iommu_superpage = 0;
600 } else if (!strncmp(str, "ecs_off", 7)) {
602 "Intel-IOMMU: disable extended context table support\n");
604 } else if (!strncmp(str, "pasid28", 7)) {
606 "Intel-IOMMU: enable pre-production PASID support\n");
607 intel_iommu_pasid28 = 1;
608 iommu_identity_mapping |= IDENTMAP_GFX;
611 str += strcspn(str, ",");
617 __setup("intel_iommu=", intel_iommu_setup);
619 static struct kmem_cache *iommu_domain_cache;
620 static struct kmem_cache *iommu_devinfo_cache;
622 static struct dmar_domain* get_iommu_domain(struct intel_iommu *iommu, u16 did)
624 struct dmar_domain **domains;
627 domains = iommu->domains[idx];
631 return domains[did & 0xff];
634 static void set_iommu_domain(struct intel_iommu *iommu, u16 did,
635 struct dmar_domain *domain)
637 struct dmar_domain **domains;
640 if (!iommu->domains[idx]) {
641 size_t size = 256 * sizeof(struct dmar_domain *);
642 iommu->domains[idx] = kzalloc(size, GFP_ATOMIC);
645 domains = iommu->domains[idx];
646 if (WARN_ON(!domains))
649 domains[did & 0xff] = domain;
652 static inline void *alloc_pgtable_page(int node)
657 page = alloc_pages_node(node, GFP_ATOMIC | __GFP_ZERO, 0);
659 vaddr = page_address(page);
663 static inline void free_pgtable_page(void *vaddr)
665 free_page((unsigned long)vaddr);
668 static inline void *alloc_domain_mem(void)
670 return kmem_cache_alloc(iommu_domain_cache, GFP_ATOMIC);
673 static void free_domain_mem(void *vaddr)
675 kmem_cache_free(iommu_domain_cache, vaddr);
678 static inline void * alloc_devinfo_mem(void)
680 return kmem_cache_alloc(iommu_devinfo_cache, GFP_ATOMIC);
683 static inline void free_devinfo_mem(void *vaddr)
685 kmem_cache_free(iommu_devinfo_cache, vaddr);
688 static inline int domain_type_is_vm(struct dmar_domain *domain)
690 return domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE;
693 static inline int domain_type_is_si(struct dmar_domain *domain)
695 return domain->flags & DOMAIN_FLAG_STATIC_IDENTITY;
698 static inline int domain_type_is_vm_or_si(struct dmar_domain *domain)
700 return domain->flags & (DOMAIN_FLAG_VIRTUAL_MACHINE |
701 DOMAIN_FLAG_STATIC_IDENTITY);
704 static inline int domain_pfn_supported(struct dmar_domain *domain,
707 int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
709 return !(addr_width < BITS_PER_LONG && pfn >> addr_width);
712 static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw)
717 sagaw = cap_sagaw(iommu->cap);
718 for (agaw = width_to_agaw(max_gaw);
720 if (test_bit(agaw, &sagaw))
728 * Calculate max SAGAW for each iommu.
730 int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
732 return __iommu_calculate_agaw(iommu, MAX_AGAW_WIDTH);
736 * calculate agaw for each iommu.
737 * "SAGAW" may be different across iommus, use a default agaw, and
738 * get a supported less agaw for iommus that don't support the default agaw.
740 int iommu_calculate_agaw(struct intel_iommu *iommu)
742 return __iommu_calculate_agaw(iommu, DEFAULT_DOMAIN_ADDRESS_WIDTH);
745 /* This functionin only returns single iommu in a domain */
746 static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain)
750 /* si_domain and vm domain should not get here. */
751 BUG_ON(domain_type_is_vm_or_si(domain));
752 for_each_domain_iommu(iommu_id, domain)
755 if (iommu_id < 0 || iommu_id >= g_num_of_iommus)
758 return g_iommus[iommu_id];
761 static void domain_update_iommu_coherency(struct dmar_domain *domain)
763 struct dmar_drhd_unit *drhd;
764 struct intel_iommu *iommu;
768 domain->iommu_coherency = 1;
770 for_each_domain_iommu(i, domain) {
772 if (!ecap_coherent(g_iommus[i]->ecap)) {
773 domain->iommu_coherency = 0;
780 /* No hardware attached; use lowest common denominator */
782 for_each_active_iommu(iommu, drhd) {
783 if (!ecap_coherent(iommu->ecap)) {
784 domain->iommu_coherency = 0;
791 static int domain_update_iommu_snooping(struct intel_iommu *skip)
793 struct dmar_drhd_unit *drhd;
794 struct intel_iommu *iommu;
798 for_each_active_iommu(iommu, drhd) {
800 if (!ecap_sc_support(iommu->ecap)) {
811 static int domain_update_iommu_superpage(struct intel_iommu *skip)
813 struct dmar_drhd_unit *drhd;
814 struct intel_iommu *iommu;
817 if (!intel_iommu_superpage) {
821 /* set iommu_superpage to the smallest common denominator */
823 for_each_active_iommu(iommu, drhd) {
825 mask &= cap_super_page_val(iommu->cap);
835 /* Some capabilities may be different across iommus */
836 static void domain_update_iommu_cap(struct dmar_domain *domain)
838 domain_update_iommu_coherency(domain);
839 domain->iommu_snooping = domain_update_iommu_snooping(NULL);
840 domain->iommu_superpage = domain_update_iommu_superpage(NULL);
843 static inline struct context_entry *iommu_context_addr(struct intel_iommu *iommu,
844 u8 bus, u8 devfn, int alloc)
846 struct root_entry *root = &iommu->root_entry[bus];
847 struct context_entry *context;
851 if (ecs_enabled(iommu)) {
859 context = phys_to_virt(*entry & VTD_PAGE_MASK);
861 unsigned long phy_addr;
865 context = alloc_pgtable_page(iommu->node);
869 __iommu_flush_cache(iommu, (void *)context, CONTEXT_SIZE);
870 phy_addr = virt_to_phys((void *)context);
871 *entry = phy_addr | 1;
872 __iommu_flush_cache(iommu, entry, sizeof(*entry));
874 return &context[devfn];
877 static int iommu_dummy(struct device *dev)
879 return dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
882 static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
884 struct dmar_drhd_unit *drhd = NULL;
885 struct intel_iommu *iommu;
887 struct pci_dev *ptmp, *pdev = NULL;
891 if (iommu_dummy(dev))
894 if (dev_is_pci(dev)) {
895 struct pci_dev *pf_pdev;
897 pdev = to_pci_dev(dev);
898 /* VFs aren't listed in scope tables; we need to look up
899 * the PF instead to find the IOMMU. */
900 pf_pdev = pci_physfn(pdev);
902 segment = pci_domain_nr(pdev->bus);
903 } else if (has_acpi_companion(dev))
904 dev = &ACPI_COMPANION(dev)->dev;
907 for_each_active_iommu(iommu, drhd) {
908 if (pdev && segment != drhd->segment)
911 for_each_active_dev_scope(drhd->devices,
912 drhd->devices_cnt, i, tmp) {
914 /* For a VF use its original BDF# not that of the PF
915 * which we used for the IOMMU lookup. Strictly speaking
916 * we could do this for all PCI devices; we only need to
917 * get the BDF# from the scope table for ACPI matches. */
921 *bus = drhd->devices[i].bus;
922 *devfn = drhd->devices[i].devfn;
926 if (!pdev || !dev_is_pci(tmp))
929 ptmp = to_pci_dev(tmp);
930 if (ptmp->subordinate &&
931 ptmp->subordinate->number <= pdev->bus->number &&
932 ptmp->subordinate->busn_res.end >= pdev->bus->number)
936 if (pdev && drhd->include_all) {
938 *bus = pdev->bus->number;
939 *devfn = pdev->devfn;
950 static void domain_flush_cache(struct dmar_domain *domain,
951 void *addr, int size)
953 if (!domain->iommu_coherency)
954 clflush_cache_range(addr, size);
957 static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn)
959 struct context_entry *context;
963 spin_lock_irqsave(&iommu->lock, flags);
964 context = iommu_context_addr(iommu, bus, devfn, 0);
966 ret = context_present(context);
967 spin_unlock_irqrestore(&iommu->lock, flags);
971 static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn)
973 struct context_entry *context;
976 spin_lock_irqsave(&iommu->lock, flags);
977 context = iommu_context_addr(iommu, bus, devfn, 0);
979 context_clear_entry(context);
980 __iommu_flush_cache(iommu, context, sizeof(*context));
982 spin_unlock_irqrestore(&iommu->lock, flags);
985 static void free_context_table(struct intel_iommu *iommu)
989 struct context_entry *context;
991 spin_lock_irqsave(&iommu->lock, flags);
992 if (!iommu->root_entry) {
995 for (i = 0; i < ROOT_ENTRY_NR; i++) {
996 context = iommu_context_addr(iommu, i, 0, 0);
998 free_pgtable_page(context);
1000 if (!ecs_enabled(iommu))
1003 context = iommu_context_addr(iommu, i, 0x80, 0);
1005 free_pgtable_page(context);
1008 free_pgtable_page(iommu->root_entry);
1009 iommu->root_entry = NULL;
1011 spin_unlock_irqrestore(&iommu->lock, flags);
1014 static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
1015 unsigned long pfn, int *target_level)
1017 struct dma_pte *parent, *pte = NULL;
1018 int level = agaw_to_level(domain->agaw);
1021 BUG_ON(!domain->pgd);
1023 if (!domain_pfn_supported(domain, pfn))
1024 /* Address beyond IOMMU's addressing capabilities. */
1027 parent = domain->pgd;
1032 offset = pfn_level_offset(pfn, level);
1033 pte = &parent[offset];
1034 if (!*target_level && (dma_pte_superpage(pte) || !dma_pte_present(pte)))
1036 if (level == *target_level)
1039 if (!dma_pte_present(pte)) {
1042 tmp_page = alloc_pgtable_page(domain->nid);
1047 domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
1048 pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
1049 if (cmpxchg64(&pte->val, 0ULL, pteval))
1050 /* Someone else set it while we were thinking; use theirs. */
1051 free_pgtable_page(tmp_page);
1053 domain_flush_cache(domain, pte, sizeof(*pte));
1058 parent = phys_to_virt(dma_pte_addr(pte));
1063 *target_level = level;
1069 /* return address's pte at specific level */
1070 static struct dma_pte *dma_pfn_level_pte(struct dmar_domain *domain,
1072 int level, int *large_page)
1074 struct dma_pte *parent, *pte = NULL;
1075 int total = agaw_to_level(domain->agaw);
1078 parent = domain->pgd;
1079 while (level <= total) {
1080 offset = pfn_level_offset(pfn, total);
1081 pte = &parent[offset];
1085 if (!dma_pte_present(pte)) {
1086 *large_page = total;
1090 if (dma_pte_superpage(pte)) {
1091 *large_page = total;
1095 parent = phys_to_virt(dma_pte_addr(pte));
1101 /* clear last level pte, a tlb flush should be followed */
1102 static void dma_pte_clear_range(struct dmar_domain *domain,
1103 unsigned long start_pfn,
1104 unsigned long last_pfn)
1106 unsigned int large_page = 1;
1107 struct dma_pte *first_pte, *pte;
1109 BUG_ON(!domain_pfn_supported(domain, start_pfn));
1110 BUG_ON(!domain_pfn_supported(domain, last_pfn));
1111 BUG_ON(start_pfn > last_pfn);
1113 /* we don't need lock here; nobody else touches the iova range */
1116 first_pte = pte = dma_pfn_level_pte(domain, start_pfn, 1, &large_page);
1118 start_pfn = align_to_level(start_pfn + 1, large_page + 1);
1123 start_pfn += lvl_to_nr_pages(large_page);
1125 } while (start_pfn <= last_pfn && !first_pte_in_page(pte));
1127 domain_flush_cache(domain, first_pte,
1128 (void *)pte - (void *)first_pte);
1130 } while (start_pfn && start_pfn <= last_pfn);
1133 static void dma_pte_free_level(struct dmar_domain *domain, int level,
1134 struct dma_pte *pte, unsigned long pfn,
1135 unsigned long start_pfn, unsigned long last_pfn)
1137 pfn = max(start_pfn, pfn);
1138 pte = &pte[pfn_level_offset(pfn, level)];
1141 unsigned long level_pfn;
1142 struct dma_pte *level_pte;
1144 if (!dma_pte_present(pte) || dma_pte_superpage(pte))
1147 level_pfn = pfn & level_mask(level);
1148 level_pte = phys_to_virt(dma_pte_addr(pte));
1151 dma_pte_free_level(domain, level - 1, level_pte,
1152 level_pfn, start_pfn, last_pfn);
1154 /* If range covers entire pagetable, free it */
1155 if (!(start_pfn > level_pfn ||
1156 last_pfn < level_pfn + level_size(level) - 1)) {
1158 domain_flush_cache(domain, pte, sizeof(*pte));
1159 free_pgtable_page(level_pte);
1162 pfn += level_size(level);
1163 } while (!first_pte_in_page(++pte) && pfn <= last_pfn);
1166 /* clear last level (leaf) ptes and free page table pages. */
1167 static void dma_pte_free_pagetable(struct dmar_domain *domain,
1168 unsigned long start_pfn,
1169 unsigned long last_pfn)
1171 BUG_ON(!domain_pfn_supported(domain, start_pfn));
1172 BUG_ON(!domain_pfn_supported(domain, last_pfn));
1173 BUG_ON(start_pfn > last_pfn);
1175 dma_pte_clear_range(domain, start_pfn, last_pfn);
1177 /* We don't need lock here; nobody else touches the iova range */
1178 dma_pte_free_level(domain, agaw_to_level(domain->agaw),
1179 domain->pgd, 0, start_pfn, last_pfn);
1182 if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {
1183 free_pgtable_page(domain->pgd);
1188 /* When a page at a given level is being unlinked from its parent, we don't
1189 need to *modify* it at all. All we need to do is make a list of all the
1190 pages which can be freed just as soon as we've flushed the IOTLB and we
1191 know the hardware page-walk will no longer touch them.
1192 The 'pte' argument is the *parent* PTE, pointing to the page that is to
1194 static struct page *dma_pte_list_pagetables(struct dmar_domain *domain,
1195 int level, struct dma_pte *pte,
1196 struct page *freelist)
1200 pg = pfn_to_page(dma_pte_addr(pte) >> PAGE_SHIFT);
1201 pg->freelist = freelist;
1207 pte = page_address(pg);
1209 if (dma_pte_present(pte) && !dma_pte_superpage(pte))
1210 freelist = dma_pte_list_pagetables(domain, level - 1,
1213 } while (!first_pte_in_page(pte));
1218 static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level,
1219 struct dma_pte *pte, unsigned long pfn,
1220 unsigned long start_pfn,
1221 unsigned long last_pfn,
1222 struct page *freelist)
1224 struct dma_pte *first_pte = NULL, *last_pte = NULL;
1226 pfn = max(start_pfn, pfn);
1227 pte = &pte[pfn_level_offset(pfn, level)];
1230 unsigned long level_pfn;
1232 if (!dma_pte_present(pte))
1235 level_pfn = pfn & level_mask(level);
1237 /* If range covers entire pagetable, free it */
1238 if (start_pfn <= level_pfn &&
1239 last_pfn >= level_pfn + level_size(level) - 1) {
1240 /* These suborbinate page tables are going away entirely. Don't
1241 bother to clear them; we're just going to *free* them. */
1242 if (level > 1 && !dma_pte_superpage(pte))
1243 freelist = dma_pte_list_pagetables(domain, level - 1, pte, freelist);
1249 } else if (level > 1) {
1250 /* Recurse down into a level that isn't *entirely* obsolete */
1251 freelist = dma_pte_clear_level(domain, level - 1,
1252 phys_to_virt(dma_pte_addr(pte)),
1253 level_pfn, start_pfn, last_pfn,
1257 pfn += level_size(level);
1258 } while (!first_pte_in_page(++pte) && pfn <= last_pfn);
1261 domain_flush_cache(domain, first_pte,
1262 (void *)++last_pte - (void *)first_pte);
1267 /* We can't just free the pages because the IOMMU may still be walking
1268 the page tables, and may have cached the intermediate levels. The
1269 pages can only be freed after the IOTLB flush has been done. */
1270 static struct page *domain_unmap(struct dmar_domain *domain,
1271 unsigned long start_pfn,
1272 unsigned long last_pfn)
1274 struct page *freelist = NULL;
1276 BUG_ON(!domain_pfn_supported(domain, start_pfn));
1277 BUG_ON(!domain_pfn_supported(domain, last_pfn));
1278 BUG_ON(start_pfn > last_pfn);
1280 /* we don't need lock here; nobody else touches the iova range */
1281 freelist = dma_pte_clear_level(domain, agaw_to_level(domain->agaw),
1282 domain->pgd, 0, start_pfn, last_pfn, NULL);
1285 if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {
1286 struct page *pgd_page = virt_to_page(domain->pgd);
1287 pgd_page->freelist = freelist;
1288 freelist = pgd_page;
1296 static void dma_free_pagelist(struct page *freelist)
1300 while ((pg = freelist)) {
1301 freelist = pg->freelist;
1302 free_pgtable_page(page_address(pg));
1306 /* iommu handling */
1307 static int iommu_alloc_root_entry(struct intel_iommu *iommu)
1309 struct root_entry *root;
1310 unsigned long flags;
1312 root = (struct root_entry *)alloc_pgtable_page(iommu->node);
1314 pr_err("Allocating root entry for %s failed\n",
1319 __iommu_flush_cache(iommu, root, ROOT_SIZE);
1321 spin_lock_irqsave(&iommu->lock, flags);
1322 iommu->root_entry = root;
1323 spin_unlock_irqrestore(&iommu->lock, flags);
1328 static void iommu_set_root_entry(struct intel_iommu *iommu)
1334 addr = virt_to_phys(iommu->root_entry);
1335 if (ecs_enabled(iommu))
1336 addr |= DMA_RTADDR_RTT;
1338 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1339 dmar_writeq(iommu->reg + DMAR_RTADDR_REG, addr);
1341 writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG);
1343 /* Make sure hardware complete it */
1344 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1345 readl, (sts & DMA_GSTS_RTPS), sts);
1347 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1350 static void iommu_flush_write_buffer(struct intel_iommu *iommu)
1355 if (!rwbf_quirk && !cap_rwbf(iommu->cap))
1358 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1359 writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG);
1361 /* Make sure hardware complete it */
1362 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1363 readl, (!(val & DMA_GSTS_WBFS)), val);
1365 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1368 /* return value determine if we need a write buffer flush */
1369 static void __iommu_flush_context(struct intel_iommu *iommu,
1370 u16 did, u16 source_id, u8 function_mask,
1377 case DMA_CCMD_GLOBAL_INVL:
1378 val = DMA_CCMD_GLOBAL_INVL;
1380 case DMA_CCMD_DOMAIN_INVL:
1381 val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did);
1383 case DMA_CCMD_DEVICE_INVL:
1384 val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did)
1385 | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask);
1390 val |= DMA_CCMD_ICC;
1392 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1393 dmar_writeq(iommu->reg + DMAR_CCMD_REG, val);
1395 /* Make sure hardware complete it */
1396 IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG,
1397 dmar_readq, (!(val & DMA_CCMD_ICC)), val);
1399 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1402 /* return value determine if we need a write buffer flush */
1403 static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did,
1404 u64 addr, unsigned int size_order, u64 type)
1406 int tlb_offset = ecap_iotlb_offset(iommu->ecap);
1407 u64 val = 0, val_iva = 0;
1411 case DMA_TLB_GLOBAL_FLUSH:
1412 /* global flush doesn't need set IVA_REG */
1413 val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT;
1415 case DMA_TLB_DSI_FLUSH:
1416 val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did);
1418 case DMA_TLB_PSI_FLUSH:
1419 val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did);
1420 /* IH bit is passed in as part of address */
1421 val_iva = size_order | addr;
1426 /* Note: set drain read/write */
1429 * This is probably to be super secure.. Looks like we can
1430 * ignore it without any impact.
1432 if (cap_read_drain(iommu->cap))
1433 val |= DMA_TLB_READ_DRAIN;
1435 if (cap_write_drain(iommu->cap))
1436 val |= DMA_TLB_WRITE_DRAIN;
1438 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1439 /* Note: Only uses first TLB reg currently */
1441 dmar_writeq(iommu->reg + tlb_offset, val_iva);
1442 dmar_writeq(iommu->reg + tlb_offset + 8, val);
1444 /* Make sure hardware complete it */
1445 IOMMU_WAIT_OP(iommu, tlb_offset + 8,
1446 dmar_readq, (!(val & DMA_TLB_IVT)), val);
1448 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1450 /* check IOTLB invalidation granularity */
1451 if (DMA_TLB_IAIG(val) == 0)
1452 pr_err("Flush IOTLB failed\n");
1453 if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type))
1454 pr_debug("TLB flush request %Lx, actual %Lx\n",
1455 (unsigned long long)DMA_TLB_IIRG(type),
1456 (unsigned long long)DMA_TLB_IAIG(val));
1459 static struct device_domain_info *
1460 iommu_support_dev_iotlb (struct dmar_domain *domain, struct intel_iommu *iommu,
1463 struct device_domain_info *info;
1465 assert_spin_locked(&device_domain_lock);
1470 list_for_each_entry(info, &domain->devices, link)
1471 if (info->iommu == iommu && info->bus == bus &&
1472 info->devfn == devfn) {
1473 if (info->ats_supported && info->dev)
1481 static void domain_update_iotlb(struct dmar_domain *domain)
1483 struct device_domain_info *info;
1484 bool has_iotlb_device = false;
1486 assert_spin_locked(&device_domain_lock);
1488 list_for_each_entry(info, &domain->devices, link) {
1489 struct pci_dev *pdev;
1491 if (!info->dev || !dev_is_pci(info->dev))
1494 pdev = to_pci_dev(info->dev);
1495 if (pdev->ats_enabled) {
1496 has_iotlb_device = true;
1501 domain->has_iotlb_device = has_iotlb_device;
1504 static void iommu_enable_dev_iotlb(struct device_domain_info *info)
1506 struct pci_dev *pdev;
1508 assert_spin_locked(&device_domain_lock);
1510 if (!info || !dev_is_pci(info->dev))
1513 pdev = to_pci_dev(info->dev);
1515 #ifdef CONFIG_INTEL_IOMMU_SVM
1516 /* The PCIe spec, in its wisdom, declares that the behaviour of
1517 the device if you enable PASID support after ATS support is
1518 undefined. So always enable PASID support on devices which
1519 have it, even if we can't yet know if we're ever going to
1521 if (info->pasid_supported && !pci_enable_pasid(pdev, info->pasid_supported & ~1))
1522 info->pasid_enabled = 1;
1524 if (info->pri_supported && !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32))
1525 info->pri_enabled = 1;
1527 if (info->ats_supported && !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) {
1528 info->ats_enabled = 1;
1529 domain_update_iotlb(info->domain);
1530 info->ats_qdep = pci_ats_queue_depth(pdev);
1534 static void iommu_disable_dev_iotlb(struct device_domain_info *info)
1536 struct pci_dev *pdev;
1538 assert_spin_locked(&device_domain_lock);
1540 if (!dev_is_pci(info->dev))
1543 pdev = to_pci_dev(info->dev);
1545 if (info->ats_enabled) {
1546 pci_disable_ats(pdev);
1547 info->ats_enabled = 0;
1548 domain_update_iotlb(info->domain);
1550 #ifdef CONFIG_INTEL_IOMMU_SVM
1551 if (info->pri_enabled) {
1552 pci_disable_pri(pdev);
1553 info->pri_enabled = 0;
1555 if (info->pasid_enabled) {
1556 pci_disable_pasid(pdev);
1557 info->pasid_enabled = 0;
1562 static void iommu_flush_dev_iotlb(struct dmar_domain *domain,
1563 u64 addr, unsigned mask)
1566 unsigned long flags;
1567 struct device_domain_info *info;
1569 if (!domain->has_iotlb_device)
1572 spin_lock_irqsave(&device_domain_lock, flags);
1573 list_for_each_entry(info, &domain->devices, link) {
1574 if (!info->ats_enabled)
1577 sid = info->bus << 8 | info->devfn;
1578 qdep = info->ats_qdep;
1579 qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask);
1581 spin_unlock_irqrestore(&device_domain_lock, flags);
1584 static void iommu_flush_iotlb_psi(struct intel_iommu *iommu,
1585 struct dmar_domain *domain,
1586 unsigned long pfn, unsigned int pages,
1589 unsigned int mask = ilog2(__roundup_pow_of_two(pages));
1590 uint64_t addr = (uint64_t)pfn << VTD_PAGE_SHIFT;
1591 u16 did = domain->iommu_did[iommu->seq_id];
1598 * Fallback to domain selective flush if no PSI support or the size is
1600 * PSI requires page size to be 2 ^ x, and the base address is naturally
1601 * aligned to the size
1603 if (!cap_pgsel_inv(iommu->cap) || mask > cap_max_amask_val(iommu->cap))
1604 iommu->flush.flush_iotlb(iommu, did, 0, 0,
1607 iommu->flush.flush_iotlb(iommu, did, addr | ih, mask,
1611 * In caching mode, changes of pages from non-present to present require
1612 * flush. However, device IOTLB doesn't need to be flushed in this case.
1614 if (!cap_caching_mode(iommu->cap) || !map)
1615 iommu_flush_dev_iotlb(get_iommu_domain(iommu, did),
1619 static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu)
1622 unsigned long flags;
1624 raw_spin_lock_irqsave(&iommu->register_lock, flags);
1625 pmen = readl(iommu->reg + DMAR_PMEN_REG);
1626 pmen &= ~DMA_PMEN_EPM;
1627 writel(pmen, iommu->reg + DMAR_PMEN_REG);
1629 /* wait for the protected region status bit to clear */
1630 IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG,
1631 readl, !(pmen & DMA_PMEN_PRS), pmen);
1633 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
1636 static void iommu_enable_translation(struct intel_iommu *iommu)
1639 unsigned long flags;
1641 raw_spin_lock_irqsave(&iommu->register_lock, flags);
1642 iommu->gcmd |= DMA_GCMD_TE;
1643 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1645 /* Make sure hardware complete it */
1646 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1647 readl, (sts & DMA_GSTS_TES), sts);
1649 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
1652 static void iommu_disable_translation(struct intel_iommu *iommu)
1657 raw_spin_lock_irqsave(&iommu->register_lock, flag);
1658 iommu->gcmd &= ~DMA_GCMD_TE;
1659 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
1661 /* Make sure hardware complete it */
1662 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
1663 readl, (!(sts & DMA_GSTS_TES)), sts);
1665 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
1669 static int iommu_init_domains(struct intel_iommu *iommu)
1671 u32 ndomains, nlongs;
1674 ndomains = cap_ndoms(iommu->cap);
1675 pr_debug("%s: Number of Domains supported <%d>\n",
1676 iommu->name, ndomains);
1677 nlongs = BITS_TO_LONGS(ndomains);
1679 spin_lock_init(&iommu->lock);
1681 iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL);
1682 if (!iommu->domain_ids) {
1683 pr_err("%s: Allocating domain id array failed\n",
1688 size = (ALIGN(ndomains, 256) >> 8) * sizeof(struct dmar_domain **);
1689 iommu->domains = kzalloc(size, GFP_KERNEL);
1691 if (iommu->domains) {
1692 size = 256 * sizeof(struct dmar_domain *);
1693 iommu->domains[0] = kzalloc(size, GFP_KERNEL);
1696 if (!iommu->domains || !iommu->domains[0]) {
1697 pr_err("%s: Allocating domain array failed\n",
1699 kfree(iommu->domain_ids);
1700 kfree(iommu->domains);
1701 iommu->domain_ids = NULL;
1702 iommu->domains = NULL;
1709 * If Caching mode is set, then invalid translations are tagged
1710 * with domain-id 0, hence we need to pre-allocate it. We also
1711 * use domain-id 0 as a marker for non-allocated domain-id, so
1712 * make sure it is not used for a real domain.
1714 set_bit(0, iommu->domain_ids);
1719 static void disable_dmar_iommu(struct intel_iommu *iommu)
1721 struct device_domain_info *info, *tmp;
1722 unsigned long flags;
1724 if (!iommu->domains || !iommu->domain_ids)
1728 spin_lock_irqsave(&device_domain_lock, flags);
1729 list_for_each_entry_safe(info, tmp, &device_domain_list, global) {
1730 struct dmar_domain *domain;
1732 if (info->iommu != iommu)
1735 if (!info->dev || !info->domain)
1738 domain = info->domain;
1740 __dmar_remove_one_dev_info(info);
1742 if (!domain_type_is_vm_or_si(domain)) {
1744 * The domain_exit() function can't be called under
1745 * device_domain_lock, as it takes this lock itself.
1746 * So release the lock here and re-run the loop
1749 spin_unlock_irqrestore(&device_domain_lock, flags);
1750 domain_exit(domain);
1754 spin_unlock_irqrestore(&device_domain_lock, flags);
1756 if (iommu->gcmd & DMA_GCMD_TE)
1757 iommu_disable_translation(iommu);
1760 static void free_dmar_iommu(struct intel_iommu *iommu)
1762 if ((iommu->domains) && (iommu->domain_ids)) {
1763 int elems = ALIGN(cap_ndoms(iommu->cap), 256) >> 8;
1766 for (i = 0; i < elems; i++)
1767 kfree(iommu->domains[i]);
1768 kfree(iommu->domains);
1769 kfree(iommu->domain_ids);
1770 iommu->domains = NULL;
1771 iommu->domain_ids = NULL;
1774 g_iommus[iommu->seq_id] = NULL;
1776 /* free context mapping */
1777 free_context_table(iommu);
1779 #ifdef CONFIG_INTEL_IOMMU_SVM
1780 if (pasid_enabled(iommu)) {
1781 if (ecap_prs(iommu->ecap))
1782 intel_svm_finish_prq(iommu);
1783 intel_svm_free_pasid_tables(iommu);
1788 static struct dmar_domain *alloc_domain(int flags)
1790 struct dmar_domain *domain;
1792 domain = alloc_domain_mem();
1796 memset(domain, 0, sizeof(*domain));
1798 domain->flags = flags;
1799 domain->has_iotlb_device = false;
1800 INIT_LIST_HEAD(&domain->devices);
1805 /* Must be called with iommu->lock */
1806 static int domain_attach_iommu(struct dmar_domain *domain,
1807 struct intel_iommu *iommu)
1809 unsigned long ndomains;
1812 assert_spin_locked(&device_domain_lock);
1813 assert_spin_locked(&iommu->lock);
1815 domain->iommu_refcnt[iommu->seq_id] += 1;
1816 domain->iommu_count += 1;
1817 if (domain->iommu_refcnt[iommu->seq_id] == 1) {
1818 ndomains = cap_ndoms(iommu->cap);
1819 num = find_first_zero_bit(iommu->domain_ids, ndomains);
1821 if (num >= ndomains) {
1822 pr_err("%s: No free domain ids\n", iommu->name);
1823 domain->iommu_refcnt[iommu->seq_id] -= 1;
1824 domain->iommu_count -= 1;
1828 set_bit(num, iommu->domain_ids);
1829 set_iommu_domain(iommu, num, domain);
1831 domain->iommu_did[iommu->seq_id] = num;
1832 domain->nid = iommu->node;
1834 domain_update_iommu_cap(domain);
1840 static int domain_detach_iommu(struct dmar_domain *domain,
1841 struct intel_iommu *iommu)
1843 int num, count = INT_MAX;
1845 assert_spin_locked(&device_domain_lock);
1846 assert_spin_locked(&iommu->lock);
1848 domain->iommu_refcnt[iommu->seq_id] -= 1;
1849 count = --domain->iommu_count;
1850 if (domain->iommu_refcnt[iommu->seq_id] == 0) {
1851 num = domain->iommu_did[iommu->seq_id];
1852 clear_bit(num, iommu->domain_ids);
1853 set_iommu_domain(iommu, num, NULL);
1855 domain_update_iommu_cap(domain);
1856 domain->iommu_did[iommu->seq_id] = 0;
1862 static struct iova_domain reserved_iova_list;
1863 static struct lock_class_key reserved_rbtree_key;
1865 static int dmar_init_reserved_ranges(void)
1867 struct pci_dev *pdev = NULL;
1871 init_iova_domain(&reserved_iova_list, VTD_PAGE_SIZE, IOVA_START_PFN,
1874 lockdep_set_class(&reserved_iova_list.iova_rbtree_lock,
1875 &reserved_rbtree_key);
1877 /* IOAPIC ranges shouldn't be accessed by DMA */
1878 iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START),
1879 IOVA_PFN(IOAPIC_RANGE_END));
1881 pr_err("Reserve IOAPIC range failed\n");
1885 /* Reserve all PCI MMIO to avoid peer-to-peer access */
1886 for_each_pci_dev(pdev) {
1889 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1890 r = &pdev->resource[i];
1891 if (!r->flags || !(r->flags & IORESOURCE_MEM))
1893 iova = reserve_iova(&reserved_iova_list,
1897 pr_err("Reserve iova failed\n");
1905 static void domain_reserve_special_ranges(struct dmar_domain *domain)
1907 copy_reserved_iova(&reserved_iova_list, &domain->iovad);
1910 static inline int guestwidth_to_adjustwidth(int gaw)
1913 int r = (gaw - 12) % 9;
1924 static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu,
1927 int adjust_width, agaw;
1928 unsigned long sagaw;
1930 init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN,
1932 domain_reserve_special_ranges(domain);
1934 /* calculate AGAW */
1935 if (guest_width > cap_mgaw(iommu->cap))
1936 guest_width = cap_mgaw(iommu->cap);
1937 domain->gaw = guest_width;
1938 adjust_width = guestwidth_to_adjustwidth(guest_width);
1939 agaw = width_to_agaw(adjust_width);
1940 sagaw = cap_sagaw(iommu->cap);
1941 if (!test_bit(agaw, &sagaw)) {
1942 /* hardware doesn't support it, choose a bigger one */
1943 pr_debug("Hardware doesn't support agaw %d\n", agaw);
1944 agaw = find_next_bit(&sagaw, 5, agaw);
1948 domain->agaw = agaw;
1950 if (ecap_coherent(iommu->ecap))
1951 domain->iommu_coherency = 1;
1953 domain->iommu_coherency = 0;
1955 if (ecap_sc_support(iommu->ecap))
1956 domain->iommu_snooping = 1;
1958 domain->iommu_snooping = 0;
1960 if (intel_iommu_superpage)
1961 domain->iommu_superpage = fls(cap_super_page_val(iommu->cap));
1963 domain->iommu_superpage = 0;
1965 domain->nid = iommu->node;
1967 /* always allocate the top pgd */
1968 domain->pgd = (struct dma_pte *)alloc_pgtable_page(domain->nid);
1971 __iommu_flush_cache(iommu, domain->pgd, PAGE_SIZE);
1975 static void domain_exit(struct dmar_domain *domain)
1977 struct page *freelist = NULL;
1979 /* Domain 0 is reserved, so dont process it */
1983 /* Flush any lazy unmaps that may reference this domain */
1984 if (!intel_iommu_strict) {
1987 for_each_possible_cpu(cpu)
1988 flush_unmaps_timeout(cpu);
1991 /* Remove associated devices and clear attached or cached domains */
1993 domain_remove_dev_info(domain);
1997 put_iova_domain(&domain->iovad);
1999 freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw));
2001 dma_free_pagelist(freelist);
2003 free_domain_mem(domain);
2006 static int domain_context_mapping_one(struct dmar_domain *domain,
2007 struct intel_iommu *iommu,
2010 u16 did = domain->iommu_did[iommu->seq_id];
2011 int translation = CONTEXT_TT_MULTI_LEVEL;
2012 struct device_domain_info *info = NULL;
2013 struct context_entry *context;
2014 unsigned long flags;
2015 struct dma_pte *pgd;
2020 if (hw_pass_through && domain_type_is_si(domain))
2021 translation = CONTEXT_TT_PASS_THROUGH;
2023 pr_debug("Set context mapping for %02x:%02x.%d\n",
2024 bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
2026 BUG_ON(!domain->pgd);
2028 spin_lock_irqsave(&device_domain_lock, flags);
2029 spin_lock(&iommu->lock);
2032 context = iommu_context_addr(iommu, bus, devfn, 1);
2037 if (context_present(context))
2041 * For kdump cases, old valid entries may be cached due to the
2042 * in-flight DMA and copied pgtable, but there is no unmapping
2043 * behaviour for them, thus we need an explicit cache flush for
2044 * the newly-mapped device. For kdump, at this point, the device
2045 * is supposed to finish reset at its driver probe stage, so no
2046 * in-flight DMA will exist, and we don't need to worry anymore
2049 if (context_copied(context)) {
2050 u16 did_old = context_domain_id(context);
2052 if (did_old >= 0 && did_old < cap_ndoms(iommu->cap))
2053 iommu->flush.flush_context(iommu, did_old,
2054 (((u16)bus) << 8) | devfn,
2055 DMA_CCMD_MASK_NOBIT,
2056 DMA_CCMD_DEVICE_INVL);
2061 context_clear_entry(context);
2062 context_set_domain_id(context, did);
2065 * Skip top levels of page tables for iommu which has less agaw
2066 * than default. Unnecessary for PT mode.
2068 if (translation != CONTEXT_TT_PASS_THROUGH) {
2069 for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
2071 pgd = phys_to_virt(dma_pte_addr(pgd));
2072 if (!dma_pte_present(pgd))
2076 info = iommu_support_dev_iotlb(domain, iommu, bus, devfn);
2077 if (info && info->ats_supported)
2078 translation = CONTEXT_TT_DEV_IOTLB;
2080 translation = CONTEXT_TT_MULTI_LEVEL;
2082 context_set_address_root(context, virt_to_phys(pgd));
2083 context_set_address_width(context, iommu->agaw);
2086 * In pass through mode, AW must be programmed to
2087 * indicate the largest AGAW value supported by
2088 * hardware. And ASR is ignored by hardware.
2090 context_set_address_width(context, iommu->msagaw);
2093 context_set_translation_type(context, translation);
2094 context_set_fault_enable(context);
2095 context_set_present(context);
2096 domain_flush_cache(domain, context, sizeof(*context));
2099 * It's a non-present to present mapping. If hardware doesn't cache
2100 * non-present entry we only need to flush the write-buffer. If the
2101 * _does_ cache non-present entries, then it does so in the special
2102 * domain #0, which we have to flush:
2104 if (cap_caching_mode(iommu->cap)) {
2105 iommu->flush.flush_context(iommu, 0,
2106 (((u16)bus) << 8) | devfn,
2107 DMA_CCMD_MASK_NOBIT,
2108 DMA_CCMD_DEVICE_INVL);
2109 iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH);
2111 iommu_flush_write_buffer(iommu);
2113 iommu_enable_dev_iotlb(info);
2118 spin_unlock(&iommu->lock);
2119 spin_unlock_irqrestore(&device_domain_lock, flags);
2124 struct domain_context_mapping_data {
2125 struct dmar_domain *domain;
2126 struct intel_iommu *iommu;
2129 static int domain_context_mapping_cb(struct pci_dev *pdev,
2130 u16 alias, void *opaque)
2132 struct domain_context_mapping_data *data = opaque;
2134 return domain_context_mapping_one(data->domain, data->iommu,
2135 PCI_BUS_NUM(alias), alias & 0xff);
2139 domain_context_mapping(struct dmar_domain *domain, struct device *dev)
2141 struct intel_iommu *iommu;
2143 struct domain_context_mapping_data data;
2145 iommu = device_to_iommu(dev, &bus, &devfn);
2149 if (!dev_is_pci(dev))
2150 return domain_context_mapping_one(domain, iommu, bus, devfn);
2152 data.domain = domain;
2155 return pci_for_each_dma_alias(to_pci_dev(dev),
2156 &domain_context_mapping_cb, &data);
2159 static int domain_context_mapped_cb(struct pci_dev *pdev,
2160 u16 alias, void *opaque)
2162 struct intel_iommu *iommu = opaque;
2164 return !device_context_mapped(iommu, PCI_BUS_NUM(alias), alias & 0xff);
2167 static int domain_context_mapped(struct device *dev)
2169 struct intel_iommu *iommu;
2172 iommu = device_to_iommu(dev, &bus, &devfn);
2176 if (!dev_is_pci(dev))
2177 return device_context_mapped(iommu, bus, devfn);
2179 return !pci_for_each_dma_alias(to_pci_dev(dev),
2180 domain_context_mapped_cb, iommu);
2183 /* Returns a number of VTD pages, but aligned to MM page size */
2184 static inline unsigned long aligned_nrpages(unsigned long host_addr,
2187 host_addr &= ~PAGE_MASK;
2188 return PAGE_ALIGN(host_addr + size) >> VTD_PAGE_SHIFT;
2191 /* Return largest possible superpage level for a given mapping */
2192 static inline int hardware_largepage_caps(struct dmar_domain *domain,
2193 unsigned long iov_pfn,
2194 unsigned long phy_pfn,
2195 unsigned long pages)
2197 int support, level = 1;
2198 unsigned long pfnmerge;
2200 support = domain->iommu_superpage;
2202 /* To use a large page, the virtual *and* physical addresses
2203 must be aligned to 2MiB/1GiB/etc. Lower bits set in either
2204 of them will mean we have to use smaller pages. So just
2205 merge them and check both at once. */
2206 pfnmerge = iov_pfn | phy_pfn;
2208 while (support && !(pfnmerge & ~VTD_STRIDE_MASK)) {
2209 pages >>= VTD_STRIDE_SHIFT;
2212 pfnmerge >>= VTD_STRIDE_SHIFT;
2219 static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
2220 struct scatterlist *sg, unsigned long phys_pfn,
2221 unsigned long nr_pages, int prot)
2223 struct dma_pte *first_pte = NULL, *pte = NULL;
2224 phys_addr_t uninitialized_var(pteval);
2225 unsigned long sg_res = 0;
2226 unsigned int largepage_lvl = 0;
2227 unsigned long lvl_pages = 0;
2229 BUG_ON(!domain_pfn_supported(domain, iov_pfn + nr_pages - 1));
2231 if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0)
2234 prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
2238 pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot;
2241 while (nr_pages > 0) {
2245 sg_res = aligned_nrpages(sg->offset, sg->length);
2246 sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
2247 sg->dma_length = sg->length;
2248 pteval = page_to_phys(sg_page(sg)) | prot;
2249 phys_pfn = pteval >> VTD_PAGE_SHIFT;
2253 largepage_lvl = hardware_largepage_caps(domain, iov_pfn, phys_pfn, sg_res);
2255 first_pte = pte = pfn_to_dma_pte(domain, iov_pfn, &largepage_lvl);
2258 /* It is large page*/
2259 if (largepage_lvl > 1) {
2260 unsigned long nr_superpages, end_pfn;
2262 pteval |= DMA_PTE_LARGE_PAGE;
2263 lvl_pages = lvl_to_nr_pages(largepage_lvl);
2265 nr_superpages = sg_res / lvl_pages;
2266 end_pfn = iov_pfn + nr_superpages * lvl_pages - 1;
2269 * Ensure that old small page tables are
2270 * removed to make room for superpage(s).
2272 dma_pte_free_pagetable(domain, iov_pfn, end_pfn);
2274 pteval &= ~(uint64_t)DMA_PTE_LARGE_PAGE;
2278 /* We don't need lock here, nobody else
2279 * touches the iova range
2281 tmp = cmpxchg64_local(&pte->val, 0ULL, pteval);
2283 static int dumps = 5;
2284 pr_crit("ERROR: DMA PTE for vPFN 0x%lx already set (to %llx not %llx)\n",
2285 iov_pfn, tmp, (unsigned long long)pteval);
2288 debug_dma_dump_mappings(NULL);
2293 lvl_pages = lvl_to_nr_pages(largepage_lvl);
2295 BUG_ON(nr_pages < lvl_pages);
2296 BUG_ON(sg_res < lvl_pages);
2298 nr_pages -= lvl_pages;
2299 iov_pfn += lvl_pages;
2300 phys_pfn += lvl_pages;
2301 pteval += lvl_pages * VTD_PAGE_SIZE;
2302 sg_res -= lvl_pages;
2304 /* If the next PTE would be the first in a new page, then we
2305 need to flush the cache on the entries we've just written.
2306 And then we'll need to recalculate 'pte', so clear it and
2307 let it get set again in the if (!pte) block above.
2309 If we're done (!nr_pages) we need to flush the cache too.
2311 Also if we've been setting superpages, we may need to
2312 recalculate 'pte' and switch back to smaller pages for the
2313 end of the mapping, if the trailing size is not enough to
2314 use another superpage (i.e. sg_res < lvl_pages). */
2316 if (!nr_pages || first_pte_in_page(pte) ||
2317 (largepage_lvl > 1 && sg_res < lvl_pages)) {
2318 domain_flush_cache(domain, first_pte,
2319 (void *)pte - (void *)first_pte);
2323 if (!sg_res && nr_pages)
2329 static inline int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
2330 struct scatterlist *sg, unsigned long nr_pages,
2333 return __domain_mapping(domain, iov_pfn, sg, 0, nr_pages, prot);
2336 static inline int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
2337 unsigned long phys_pfn, unsigned long nr_pages,
2340 return __domain_mapping(domain, iov_pfn, NULL, phys_pfn, nr_pages, prot);
2343 static void domain_context_clear_one(struct intel_iommu *iommu, u8 bus, u8 devfn)
2348 clear_context_table(iommu, bus, devfn);
2349 iommu->flush.flush_context(iommu, 0, 0, 0,
2350 DMA_CCMD_GLOBAL_INVL);
2351 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
2354 static inline void unlink_domain_info(struct device_domain_info *info)
2356 assert_spin_locked(&device_domain_lock);
2357 list_del(&info->link);
2358 list_del(&info->global);
2360 info->dev->archdata.iommu = NULL;
2363 static void domain_remove_dev_info(struct dmar_domain *domain)
2365 struct device_domain_info *info, *tmp;
2366 unsigned long flags;
2368 spin_lock_irqsave(&device_domain_lock, flags);
2369 list_for_each_entry_safe(info, tmp, &domain->devices, link)
2370 __dmar_remove_one_dev_info(info);
2371 spin_unlock_irqrestore(&device_domain_lock, flags);
2376 * Note: we use struct device->archdata.iommu stores the info
2378 static struct dmar_domain *find_domain(struct device *dev)
2380 struct device_domain_info *info;
2382 /* No lock here, assumes no domain exit in normal case */
2383 info = dev->archdata.iommu;
2385 return info->domain;
2389 static inline struct device_domain_info *
2390 dmar_search_domain_by_dev_info(int segment, int bus, int devfn)
2392 struct device_domain_info *info;
2394 list_for_each_entry(info, &device_domain_list, global)
2395 if (info->iommu->segment == segment && info->bus == bus &&
2396 info->devfn == devfn)
2402 static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
2405 struct dmar_domain *domain)
2407 struct dmar_domain *found = NULL;
2408 struct device_domain_info *info;
2409 unsigned long flags;
2412 info = alloc_devinfo_mem();
2417 info->devfn = devfn;
2418 info->ats_supported = info->pasid_supported = info->pri_supported = 0;
2419 info->ats_enabled = info->pasid_enabled = info->pri_enabled = 0;
2422 info->domain = domain;
2423 info->iommu = iommu;
2425 if (dev && dev_is_pci(dev)) {
2426 struct pci_dev *pdev = to_pci_dev(info->dev);
2428 if (ecap_dev_iotlb_support(iommu->ecap) &&
2429 pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS) &&
2430 dmar_find_matched_atsr_unit(pdev))
2431 info->ats_supported = 1;
2433 if (ecs_enabled(iommu)) {
2434 if (pasid_enabled(iommu)) {
2435 int features = pci_pasid_features(pdev);
2437 info->pasid_supported = features | 1;
2440 if (info->ats_supported && ecap_prs(iommu->ecap) &&
2441 pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI))
2442 info->pri_supported = 1;
2446 spin_lock_irqsave(&device_domain_lock, flags);
2448 found = find_domain(dev);
2451 struct device_domain_info *info2;
2452 info2 = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn);
2454 found = info2->domain;
2460 spin_unlock_irqrestore(&device_domain_lock, flags);
2461 free_devinfo_mem(info);
2462 /* Caller must free the original domain */
2466 spin_lock(&iommu->lock);
2467 ret = domain_attach_iommu(domain, iommu);
2468 spin_unlock(&iommu->lock);
2471 spin_unlock_irqrestore(&device_domain_lock, flags);
2472 free_devinfo_mem(info);
2476 list_add(&info->link, &domain->devices);
2477 list_add(&info->global, &device_domain_list);
2479 dev->archdata.iommu = info;
2480 spin_unlock_irqrestore(&device_domain_lock, flags);
2482 if (dev && domain_context_mapping(domain, dev)) {
2483 pr_err("Domain context map for %s failed\n", dev_name(dev));
2484 dmar_remove_one_dev_info(domain, dev);
2491 static int get_last_alias(struct pci_dev *pdev, u16 alias, void *opaque)
2493 *(u16 *)opaque = alias;
2497 static struct dmar_domain *find_or_alloc_domain(struct device *dev, int gaw)
2499 struct device_domain_info *info = NULL;
2500 struct dmar_domain *domain = NULL;
2501 struct intel_iommu *iommu;
2502 u16 req_id, dma_alias;
2503 unsigned long flags;
2506 iommu = device_to_iommu(dev, &bus, &devfn);
2510 req_id = ((u16)bus << 8) | devfn;
2512 if (dev_is_pci(dev)) {
2513 struct pci_dev *pdev = to_pci_dev(dev);
2515 pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias);
2517 spin_lock_irqsave(&device_domain_lock, flags);
2518 info = dmar_search_domain_by_dev_info(pci_domain_nr(pdev->bus),
2519 PCI_BUS_NUM(dma_alias),
2522 iommu = info->iommu;
2523 domain = info->domain;
2525 spin_unlock_irqrestore(&device_domain_lock, flags);
2527 /* DMA alias already has a domain, use it */
2532 /* Allocate and initialize new domain for the device */
2533 domain = alloc_domain(0);
2536 if (domain_init(domain, iommu, gaw)) {
2537 domain_exit(domain);
2546 static struct dmar_domain *set_domain_for_dev(struct device *dev,
2547 struct dmar_domain *domain)
2549 struct intel_iommu *iommu;
2550 struct dmar_domain *tmp;
2551 u16 req_id, dma_alias;
2554 iommu = device_to_iommu(dev, &bus, &devfn);
2558 req_id = ((u16)bus << 8) | devfn;
2560 if (dev_is_pci(dev)) {
2561 struct pci_dev *pdev = to_pci_dev(dev);
2563 pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias);
2565 /* register PCI DMA alias device */
2566 if (req_id != dma_alias) {
2567 tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias),
2568 dma_alias & 0xff, NULL, domain);
2570 if (!tmp || tmp != domain)
2575 tmp = dmar_insert_one_dev_info(iommu, bus, devfn, dev, domain);
2576 if (!tmp || tmp != domain)
2582 static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
2584 struct dmar_domain *domain, *tmp;
2586 domain = find_domain(dev);
2590 domain = find_or_alloc_domain(dev, gaw);
2594 tmp = set_domain_for_dev(dev, domain);
2595 if (!tmp || domain != tmp) {
2596 domain_exit(domain);
2605 static int iommu_domain_identity_map(struct dmar_domain *domain,
2606 unsigned long long start,
2607 unsigned long long end)
2609 unsigned long first_vpfn = start >> VTD_PAGE_SHIFT;
2610 unsigned long last_vpfn = end >> VTD_PAGE_SHIFT;
2612 if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn),
2613 dma_to_mm_pfn(last_vpfn))) {
2614 pr_err("Reserving iova failed\n");
2618 pr_debug("Mapping reserved region %llx-%llx\n", start, end);
2620 * RMRR range might have overlap with physical memory range,
2623 dma_pte_clear_range(domain, first_vpfn, last_vpfn);
2625 return domain_pfn_mapping(domain, first_vpfn, first_vpfn,
2626 last_vpfn - first_vpfn + 1,
2627 DMA_PTE_READ|DMA_PTE_WRITE);
2630 static int domain_prepare_identity_map(struct device *dev,
2631 struct dmar_domain *domain,
2632 unsigned long long start,
2633 unsigned long long end)
2635 /* For _hardware_ passthrough, don't bother. But for software
2636 passthrough, we do it anyway -- it may indicate a memory
2637 range which is reserved in E820, so which didn't get set
2638 up to start with in si_domain */
2639 if (domain == si_domain && hw_pass_through) {
2640 pr_warn("Ignoring identity map for HW passthrough device %s [0x%Lx - 0x%Lx]\n",
2641 dev_name(dev), start, end);
2645 pr_info("Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
2646 dev_name(dev), start, end);
2649 WARN(1, "Your BIOS is broken; RMRR ends before it starts!\n"
2650 "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
2651 dmi_get_system_info(DMI_BIOS_VENDOR),
2652 dmi_get_system_info(DMI_BIOS_VERSION),
2653 dmi_get_system_info(DMI_PRODUCT_VERSION));
2657 if (end >> agaw_to_width(domain->agaw)) {
2658 WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
2659 "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
2660 agaw_to_width(domain->agaw),
2661 dmi_get_system_info(DMI_BIOS_VENDOR),
2662 dmi_get_system_info(DMI_BIOS_VERSION),
2663 dmi_get_system_info(DMI_PRODUCT_VERSION));
2667 return iommu_domain_identity_map(domain, start, end);
2670 static int iommu_prepare_identity_map(struct device *dev,
2671 unsigned long long start,
2672 unsigned long long end)
2674 struct dmar_domain *domain;
2677 domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
2681 ret = domain_prepare_identity_map(dev, domain, start, end);
2683 domain_exit(domain);
2688 static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr,
2691 if (dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
2693 return iommu_prepare_identity_map(dev, rmrr->base_address,
2697 #ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA
2698 static inline void iommu_prepare_isa(void)
2700 struct pci_dev *pdev;
2703 pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
2707 pr_info("Prepare 0-16MiB unity mapping for LPC\n");
2708 ret = iommu_prepare_identity_map(&pdev->dev, 0, 16*1024*1024 - 1);
2711 pr_err("Failed to create 0-16MiB identity map - floppy might not work\n");
2716 static inline void iommu_prepare_isa(void)
2720 #endif /* !CONFIG_INTEL_IOMMU_FLPY_WA */
2722 static int md_domain_init(struct dmar_domain *domain, int guest_width);
2724 static int __init si_domain_init(int hw)
2728 si_domain = alloc_domain(DOMAIN_FLAG_STATIC_IDENTITY);
2732 if (md_domain_init(si_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
2733 domain_exit(si_domain);
2737 pr_debug("Identity mapping domain allocated\n");
2742 for_each_online_node(nid) {
2743 unsigned long start_pfn, end_pfn;
2746 for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
2747 ret = iommu_domain_identity_map(si_domain,
2748 PFN_PHYS(start_pfn), PFN_PHYS(end_pfn));
2757 static int identity_mapping(struct device *dev)
2759 struct device_domain_info *info;
2761 if (likely(!iommu_identity_mapping))
2764 info = dev->archdata.iommu;
2765 if (info && info != DUMMY_DEVICE_DOMAIN_INFO)
2766 return (info->domain == si_domain);
2771 static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev)
2773 struct dmar_domain *ndomain;
2774 struct intel_iommu *iommu;
2777 iommu = device_to_iommu(dev, &bus, &devfn);
2781 ndomain = dmar_insert_one_dev_info(iommu, bus, devfn, dev, domain);
2782 if (ndomain != domain)
2788 static bool device_has_rmrr(struct device *dev)
2790 struct dmar_rmrr_unit *rmrr;
2795 for_each_rmrr_units(rmrr) {
2797 * Return TRUE if this RMRR contains the device that
2800 for_each_active_dev_scope(rmrr->devices,
2801 rmrr->devices_cnt, i, tmp)
2812 * There are a couple cases where we need to restrict the functionality of
2813 * devices associated with RMRRs. The first is when evaluating a device for
2814 * identity mapping because problems exist when devices are moved in and out
2815 * of domains and their respective RMRR information is lost. This means that
2816 * a device with associated RMRRs will never be in a "passthrough" domain.
2817 * The second is use of the device through the IOMMU API. This interface
2818 * expects to have full control of the IOVA space for the device. We cannot
2819 * satisfy both the requirement that RMRR access is maintained and have an
2820 * unencumbered IOVA space. We also have no ability to quiesce the device's
2821 * use of the RMRR space or even inform the IOMMU API user of the restriction.
2822 * We therefore prevent devices associated with an RMRR from participating in
2823 * the IOMMU API, which eliminates them from device assignment.
2825 * In both cases we assume that PCI USB devices with RMRRs have them largely
2826 * for historical reasons and that the RMRR space is not actively used post
2827 * boot. This exclusion may change if vendors begin to abuse it.
2829 * The same exception is made for graphics devices, with the requirement that
2830 * any use of the RMRR regions will be torn down before assigning the device
2833 static bool device_is_rmrr_locked(struct device *dev)
2835 if (!device_has_rmrr(dev))
2838 if (dev_is_pci(dev)) {
2839 struct pci_dev *pdev = to_pci_dev(dev);
2841 if (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev))
2848 static int iommu_should_identity_map(struct device *dev, int startup)
2851 if (dev_is_pci(dev)) {
2852 struct pci_dev *pdev = to_pci_dev(dev);
2854 if (device_is_rmrr_locked(dev))
2857 if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
2860 if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
2863 if (!(iommu_identity_mapping & IDENTMAP_ALL))
2867 * We want to start off with all devices in the 1:1 domain, and
2868 * take them out later if we find they can't access all of memory.
2870 * However, we can't do this for PCI devices behind bridges,
2871 * because all PCI devices behind the same bridge will end up
2872 * with the same source-id on their transactions.
2874 * Practically speaking, we can't change things around for these
2875 * devices at run-time, because we can't be sure there'll be no
2876 * DMA transactions in flight for any of their siblings.
2878 * So PCI devices (unless they're on the root bus) as well as
2879 * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of
2880 * the 1:1 domain, just in _case_ one of their siblings turns out
2881 * not to be able to map all of memory.
2883 if (!pci_is_pcie(pdev)) {
2884 if (!pci_is_root_bus(pdev->bus))
2886 if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
2888 } else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE)
2891 if (device_has_rmrr(dev))
2896 * At boot time, we don't yet know if devices will be 64-bit capable.
2897 * Assume that they will — if they turn out not to be, then we can
2898 * take them out of the 1:1 domain later.
2902 * If the device's dma_mask is less than the system's memory
2903 * size then this is not a candidate for identity mapping.
2905 u64 dma_mask = *dev->dma_mask;
2907 if (dev->coherent_dma_mask &&
2908 dev->coherent_dma_mask < dma_mask)
2909 dma_mask = dev->coherent_dma_mask;
2911 return dma_mask >= dma_get_required_mask(dev);
2917 static int __init dev_prepare_static_identity_mapping(struct device *dev, int hw)
2921 if (!iommu_should_identity_map(dev, 1))
2924 ret = domain_add_dev_info(si_domain, dev);
2926 pr_info("%s identity mapping for device %s\n",
2927 hw ? "Hardware" : "Software", dev_name(dev));
2928 else if (ret == -ENODEV)
2929 /* device not associated with an iommu */
2936 static int __init iommu_prepare_static_identity_mapping(int hw)
2938 struct pci_dev *pdev = NULL;
2939 struct dmar_drhd_unit *drhd;
2940 struct intel_iommu *iommu;
2945 for_each_pci_dev(pdev) {
2946 ret = dev_prepare_static_identity_mapping(&pdev->dev, hw);
2951 for_each_active_iommu(iommu, drhd)
2952 for_each_active_dev_scope(drhd->devices, drhd->devices_cnt, i, dev) {
2953 struct acpi_device_physical_node *pn;
2954 struct acpi_device *adev;
2956 if (dev->bus != &acpi_bus_type)
2959 adev= to_acpi_device(dev);
2960 mutex_lock(&adev->physical_node_lock);
2961 list_for_each_entry(pn, &adev->physical_node_list, node) {
2962 ret = dev_prepare_static_identity_mapping(pn->dev, hw);
2966 mutex_unlock(&adev->physical_node_lock);
2974 static void intel_iommu_init_qi(struct intel_iommu *iommu)
2977 * Start from the sane iommu hardware state.
2978 * If the queued invalidation is already initialized by us
2979 * (for example, while enabling interrupt-remapping) then
2980 * we got the things already rolling from a sane state.
2984 * Clear any previous faults.
2986 dmar_fault(-1, iommu);
2988 * Disable queued invalidation if supported and already enabled
2989 * before OS handover.
2991 dmar_disable_qi(iommu);
2994 if (dmar_enable_qi(iommu)) {
2996 * Queued Invalidate not enabled, use Register Based Invalidate
2998 iommu->flush.flush_context = __iommu_flush_context;
2999 iommu->flush.flush_iotlb = __iommu_flush_iotlb;
3000 pr_info("%s: Using Register based invalidation\n",
3003 iommu->flush.flush_context = qi_flush_context;
3004 iommu->flush.flush_iotlb = qi_flush_iotlb;
3005 pr_info("%s: Using Queued invalidation\n", iommu->name);
3009 static int copy_context_table(struct intel_iommu *iommu,
3010 struct root_entry *old_re,
3011 struct context_entry **tbl,
3014 int tbl_idx, pos = 0, idx, devfn, ret = 0, did;
3015 struct context_entry *new_ce = NULL, ce;
3016 struct context_entry *old_ce = NULL;
3017 struct root_entry re;
3018 phys_addr_t old_ce_phys;
3020 tbl_idx = ext ? bus * 2 : bus;
3021 memcpy(&re, old_re, sizeof(re));
3023 for (devfn = 0; devfn < 256; devfn++) {
3024 /* First calculate the correct index */
3025 idx = (ext ? devfn * 2 : devfn) % 256;
3028 /* First save what we may have and clean up */
3030 tbl[tbl_idx] = new_ce;
3031 __iommu_flush_cache(iommu, new_ce,
3041 old_ce_phys = root_entry_lctp(&re);
3043 old_ce_phys = root_entry_uctp(&re);
3046 if (ext && devfn == 0) {
3047 /* No LCTP, try UCTP */
3056 old_ce = memremap(old_ce_phys, PAGE_SIZE,
3061 new_ce = alloc_pgtable_page(iommu->node);
3068 /* Now copy the context entry */
3069 memcpy(&ce, old_ce + idx, sizeof(ce));
3071 if (!__context_present(&ce))
3074 did = context_domain_id(&ce);
3075 if (did >= 0 && did < cap_ndoms(iommu->cap))
3076 set_bit(did, iommu->domain_ids);
3079 * We need a marker for copied context entries. This
3080 * marker needs to work for the old format as well as
3081 * for extended context entries.
3083 * Bit 67 of the context entry is used. In the old
3084 * format this bit is available to software, in the
3085 * extended format it is the PGE bit, but PGE is ignored
3086 * by HW if PASIDs are disabled (and thus still
3089 * So disable PASIDs first and then mark the entry
3090 * copied. This means that we don't copy PASID
3091 * translations from the old kernel, but this is fine as
3092 * faults there are not fatal.
3094 context_clear_pasid_enable(&ce);
3095 context_set_copied(&ce);
3100 tbl[tbl_idx + pos] = new_ce;
3102 __iommu_flush_cache(iommu, new_ce, VTD_PAGE_SIZE);
3111 static int copy_translation_tables(struct intel_iommu *iommu)
3113 struct context_entry **ctxt_tbls;
3114 struct root_entry *old_rt;
3115 phys_addr_t old_rt_phys;
3116 int ctxt_table_entries;
3117 unsigned long flags;
3122 rtaddr_reg = dmar_readq(iommu->reg + DMAR_RTADDR_REG);
3123 ext = !!(rtaddr_reg & DMA_RTADDR_RTT);
3124 new_ext = !!ecap_ecs(iommu->ecap);
3127 * The RTT bit can only be changed when translation is disabled,
3128 * but disabling translation means to open a window for data
3129 * corruption. So bail out and don't copy anything if we would
3130 * have to change the bit.
3135 old_rt_phys = rtaddr_reg & VTD_PAGE_MASK;
3139 old_rt = memremap(old_rt_phys, PAGE_SIZE, MEMREMAP_WB);
3143 /* This is too big for the stack - allocate it from slab */
3144 ctxt_table_entries = ext ? 512 : 256;
3146 ctxt_tbls = kzalloc(ctxt_table_entries * sizeof(void *), GFP_KERNEL);
3150 for (bus = 0; bus < 256; bus++) {
3151 ret = copy_context_table(iommu, &old_rt[bus],
3152 ctxt_tbls, bus, ext);
3154 pr_err("%s: Failed to copy context table for bus %d\n",
3160 spin_lock_irqsave(&iommu->lock, flags);
3162 /* Context tables are copied, now write them to the root_entry table */
3163 for (bus = 0; bus < 256; bus++) {
3164 int idx = ext ? bus * 2 : bus;
3167 if (ctxt_tbls[idx]) {
3168 val = virt_to_phys(ctxt_tbls[idx]) | 1;
3169 iommu->root_entry[bus].lo = val;
3172 if (!ext || !ctxt_tbls[idx + 1])
3175 val = virt_to_phys(ctxt_tbls[idx + 1]) | 1;
3176 iommu->root_entry[bus].hi = val;
3179 spin_unlock_irqrestore(&iommu->lock, flags);
3183 __iommu_flush_cache(iommu, iommu->root_entry, PAGE_SIZE);
3193 static int __init init_dmars(void)
3195 struct dmar_drhd_unit *drhd;
3196 struct dmar_rmrr_unit *rmrr;
3197 bool copied_tables = false;
3199 struct intel_iommu *iommu;
3205 * initialize and program root entry to not present
3208 for_each_drhd_unit(drhd) {
3210 * lock not needed as this is only incremented in the single
3211 * threaded kernel __init code path all other access are read
3214 if (g_num_of_iommus < DMAR_UNITS_SUPPORTED) {
3218 pr_err_once("Exceeded %d IOMMUs\n", DMAR_UNITS_SUPPORTED);
3221 /* Preallocate enough resources for IOMMU hot-addition */
3222 if (g_num_of_iommus < DMAR_UNITS_SUPPORTED)
3223 g_num_of_iommus = DMAR_UNITS_SUPPORTED;
3225 g_iommus = kcalloc(g_num_of_iommus, sizeof(struct intel_iommu *),
3228 pr_err("Allocating global iommu array failed\n");
3233 for_each_possible_cpu(cpu) {
3234 struct deferred_flush_data *dfd = per_cpu_ptr(&deferred_flush,
3237 dfd->tables = kzalloc(g_num_of_iommus *
3238 sizeof(struct deferred_flush_table),
3245 spin_lock_init(&dfd->lock);
3246 setup_timer(&dfd->timer, flush_unmaps_timeout, cpu);
3249 for_each_active_iommu(iommu, drhd) {
3250 g_iommus[iommu->seq_id] = iommu;
3252 intel_iommu_init_qi(iommu);
3254 ret = iommu_init_domains(iommu);
3258 init_translation_status(iommu);
3260 if (translation_pre_enabled(iommu) && !is_kdump_kernel()) {
3261 iommu_disable_translation(iommu);
3262 clear_translation_pre_enabled(iommu);
3263 pr_warn("Translation was enabled for %s but we are not in kdump mode\n",
3269 * we could share the same root & context tables
3270 * among all IOMMU's. Need to Split it later.
3272 ret = iommu_alloc_root_entry(iommu);
3276 if (translation_pre_enabled(iommu)) {
3277 pr_info("Translation already enabled - trying to copy translation structures\n");
3279 ret = copy_translation_tables(iommu);
3282 * We found the IOMMU with translation
3283 * enabled - but failed to copy over the
3284 * old root-entry table. Try to proceed
3285 * by disabling translation now and
3286 * allocating a clean root-entry table.
3287 * This might cause DMAR faults, but
3288 * probably the dump will still succeed.
3290 pr_err("Failed to copy translation tables from previous kernel for %s\n",
3292 iommu_disable_translation(iommu);
3293 clear_translation_pre_enabled(iommu);
3295 pr_info("Copied translation tables from previous kernel for %s\n",
3297 copied_tables = true;
3301 if (!ecap_pass_through(iommu->ecap))
3302 hw_pass_through = 0;
3303 #ifdef CONFIG_INTEL_IOMMU_SVM
3304 if (pasid_enabled(iommu))
3305 intel_svm_alloc_pasid_tables(iommu);
3310 * Now that qi is enabled on all iommus, set the root entry and flush
3311 * caches. This is required on some Intel X58 chipsets, otherwise the
3312 * flush_context function will loop forever and the boot hangs.
3314 for_each_active_iommu(iommu, drhd) {
3315 iommu_flush_write_buffer(iommu);
3316 iommu_set_root_entry(iommu);
3317 iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
3318 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
3321 if (iommu_pass_through)
3322 iommu_identity_mapping |= IDENTMAP_ALL;
3324 #ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
3325 iommu_identity_mapping |= IDENTMAP_GFX;
3328 check_tylersburg_isoch();
3330 if (iommu_identity_mapping) {
3331 ret = si_domain_init(hw_pass_through);
3338 * If we copied translations from a previous kernel in the kdump
3339 * case, we can not assign the devices to domains now, as that
3340 * would eliminate the old mappings. So skip this part and defer
3341 * the assignment to device driver initialization time.
3347 * If pass through is not set or not enabled, setup context entries for
3348 * identity mappings for rmrr, gfx, and isa and may fall back to static
3349 * identity mapping if iommu_identity_mapping is set.
3351 if (iommu_identity_mapping) {
3352 ret = iommu_prepare_static_identity_mapping(hw_pass_through);
3354 pr_crit("Failed to setup IOMMU pass-through\n");
3360 * for each dev attached to rmrr
3362 * locate drhd for dev, alloc domain for dev
3363 * allocate free domain
3364 * allocate page table entries for rmrr
3365 * if context not allocated for bus
3366 * allocate and init context
3367 * set present in root table for this bus
3368 * init context with domain, translation etc
3372 pr_info("Setting RMRR:\n");
3373 for_each_rmrr_units(rmrr) {
3374 /* some BIOS lists non-exist devices in DMAR table. */
3375 for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
3377 ret = iommu_prepare_rmrr_dev(rmrr, dev);
3379 pr_err("Mapping reserved region failed\n");
3383 iommu_prepare_isa();
3390 * global invalidate context cache
3391 * global invalidate iotlb
3392 * enable translation
3394 for_each_iommu(iommu, drhd) {
3395 if (drhd->ignored) {
3397 * we always have to disable PMRs or DMA may fail on
3401 iommu_disable_protect_mem_regions(iommu);
3405 iommu_flush_write_buffer(iommu);
3407 #ifdef CONFIG_INTEL_IOMMU_SVM
3408 if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
3409 ret = intel_svm_enable_prq(iommu);
3414 ret = dmar_set_interrupt(iommu);
3418 if (!translation_pre_enabled(iommu))
3419 iommu_enable_translation(iommu);
3421 iommu_disable_protect_mem_regions(iommu);
3427 for_each_active_iommu(iommu, drhd) {
3428 disable_dmar_iommu(iommu);
3429 free_dmar_iommu(iommu);
3432 for_each_possible_cpu(cpu)
3433 kfree(per_cpu_ptr(&deferred_flush, cpu)->tables);
3439 /* This takes a number of _MM_ pages, not VTD pages */
3440 static unsigned long intel_alloc_iova(struct device *dev,
3441 struct dmar_domain *domain,
3442 unsigned long nrpages, uint64_t dma_mask)
3444 unsigned long iova_pfn = 0;
3446 /* Restrict dma_mask to the width that the iommu can handle */
3447 dma_mask = min_t(uint64_t, DOMAIN_MAX_ADDR(domain->gaw), dma_mask);
3448 /* Ensure we reserve the whole size-aligned region */
3449 nrpages = __roundup_pow_of_two(nrpages);
3451 if (!dmar_forcedac && dma_mask > DMA_BIT_MASK(32)) {
3453 * First try to allocate an io virtual address in
3454 * DMA_BIT_MASK(32) and if that fails then try allocating
3457 iova_pfn = alloc_iova_fast(&domain->iovad, nrpages,
3458 IOVA_PFN(DMA_BIT_MASK(32)));
3462 iova_pfn = alloc_iova_fast(&domain->iovad, nrpages, IOVA_PFN(dma_mask));
3463 if (unlikely(!iova_pfn)) {
3464 pr_err("Allocating %ld-page iova for %s failed",
3465 nrpages, dev_name(dev));
3472 static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
3474 struct dmar_domain *domain, *tmp;
3475 struct dmar_rmrr_unit *rmrr;
3476 struct device *i_dev;
3479 domain = find_domain(dev);
3483 domain = find_or_alloc_domain(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
3487 /* We have a new domain - setup possible RMRRs for the device */
3489 for_each_rmrr_units(rmrr) {
3490 for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
3495 ret = domain_prepare_identity_map(dev, domain,
3499 dev_err(dev, "Mapping reserved region failed\n");
3504 tmp = set_domain_for_dev(dev, domain);
3505 if (!tmp || domain != tmp) {
3506 domain_exit(domain);
3513 pr_err("Allocating domain for %s failed\n", dev_name(dev));
3519 static inline struct dmar_domain *get_valid_domain_for_dev(struct device *dev)
3521 struct device_domain_info *info;
3523 /* No lock here, assumes no domain exit in normal case */
3524 info = dev->archdata.iommu;
3526 return info->domain;
3528 return __get_valid_domain_for_dev(dev);
3531 /* Check if the dev needs to go through non-identity map and unmap process.*/
3532 static int iommu_no_mapping(struct device *dev)
3536 if (iommu_dummy(dev))
3539 if (!iommu_identity_mapping)
3542 found = identity_mapping(dev);
3544 if (iommu_should_identity_map(dev, 0))
3548 * 32 bit DMA is removed from si_domain and fall back
3549 * to non-identity mapping.
3551 dmar_remove_one_dev_info(si_domain, dev);
3552 pr_info("32bit %s uses non-identity mapping\n",
3558 * In case of a detached 64 bit DMA device from vm, the device
3559 * is put into si_domain for identity mapping.
3561 if (iommu_should_identity_map(dev, 0)) {
3563 ret = domain_add_dev_info(si_domain, dev);
3565 pr_info("64bit %s uses identity mapping\n",
3575 static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr,
3576 size_t size, int dir, u64 dma_mask)
3578 struct dmar_domain *domain;
3579 phys_addr_t start_paddr;
3580 unsigned long iova_pfn;
3583 struct intel_iommu *iommu;
3584 unsigned long paddr_pfn = paddr >> PAGE_SHIFT;
3586 BUG_ON(dir == DMA_NONE);
3588 if (iommu_no_mapping(dev))
3591 domain = get_valid_domain_for_dev(dev);
3595 iommu = domain_get_iommu(domain);
3596 size = aligned_nrpages(paddr, size);
3598 iova_pfn = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size), dma_mask);
3603 * Check if DMAR supports zero-length reads on write only
3606 if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \
3607 !cap_zlr(iommu->cap))
3608 prot |= DMA_PTE_READ;
3609 if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
3610 prot |= DMA_PTE_WRITE;
3612 * paddr - (paddr + size) might be partial page, we should map the whole
3613 * page. Note: if two part of one page are separately mapped, we
3614 * might have two guest_addr mapping to the same host paddr, but this
3615 * is not a big problem
3617 ret = domain_pfn_mapping(domain, mm_to_dma_pfn(iova_pfn),
3618 mm_to_dma_pfn(paddr_pfn), size, prot);
3622 /* it's a non-present to present mapping. Only flush if caching mode */
3623 if (cap_caching_mode(iommu->cap))
3624 iommu_flush_iotlb_psi(iommu, domain,
3625 mm_to_dma_pfn(iova_pfn),
3628 iommu_flush_write_buffer(iommu);
3630 start_paddr = (phys_addr_t)iova_pfn << PAGE_SHIFT;
3631 start_paddr += paddr & ~PAGE_MASK;
3636 free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(size));
3637 pr_err("Device %s request: %zx@%llx dir %d --- failed\n",
3638 dev_name(dev), size, (unsigned long long)paddr, dir);
3642 static dma_addr_t intel_map_page(struct device *dev, struct page *page,
3643 unsigned long offset, size_t size,
3644 enum dma_data_direction dir,
3645 unsigned long attrs)
3647 return __intel_map_single(dev, page_to_phys(page) + offset, size,
3648 dir, *dev->dma_mask);
3651 static void flush_unmaps(struct deferred_flush_data *flush_data)
3655 flush_data->timer_on = 0;
3657 /* just flush them all */
3658 for (i = 0; i < g_num_of_iommus; i++) {
3659 struct intel_iommu *iommu = g_iommus[i];
3660 struct deferred_flush_table *flush_table =
3661 &flush_data->tables[i];
3665 if (!flush_table->next)
3668 /* In caching mode, global flushes turn emulation expensive */
3669 if (!cap_caching_mode(iommu->cap))
3670 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
3671 DMA_TLB_GLOBAL_FLUSH);
3672 for (j = 0; j < flush_table->next; j++) {
3674 struct deferred_flush_entry *entry =
3675 &flush_table->entries[j];
3676 unsigned long iova_pfn = entry->iova_pfn;
3677 unsigned long nrpages = entry->nrpages;
3678 struct dmar_domain *domain = entry->domain;
3679 struct page *freelist = entry->freelist;
3681 /* On real hardware multiple invalidations are expensive */
3682 if (cap_caching_mode(iommu->cap))
3683 iommu_flush_iotlb_psi(iommu, domain,
3684 mm_to_dma_pfn(iova_pfn),
3685 nrpages, !freelist, 0);
3687 mask = ilog2(nrpages);
3688 iommu_flush_dev_iotlb(domain,
3689 (uint64_t)iova_pfn << PAGE_SHIFT, mask);
3691 free_iova_fast(&domain->iovad, iova_pfn, nrpages);
3693 dma_free_pagelist(freelist);
3695 flush_table->next = 0;
3698 flush_data->size = 0;
3701 static void flush_unmaps_timeout(unsigned long cpuid)
3703 struct deferred_flush_data *flush_data = per_cpu_ptr(&deferred_flush, cpuid);
3704 unsigned long flags;
3706 spin_lock_irqsave(&flush_data->lock, flags);
3707 flush_unmaps(flush_data);
3708 spin_unlock_irqrestore(&flush_data->lock, flags);
3711 static void add_unmap(struct dmar_domain *dom, unsigned long iova_pfn,
3712 unsigned long nrpages, struct page *freelist)
3714 unsigned long flags;
3715 int entry_id, iommu_id;
3716 struct intel_iommu *iommu;
3717 struct deferred_flush_entry *entry;
3718 struct deferred_flush_data *flush_data;
3722 flush_data = per_cpu_ptr(&deferred_flush, cpuid);
3724 /* Flush all CPUs' entries to avoid deferring too much. If
3725 * this becomes a bottleneck, can just flush us, and rely on
3726 * flush timer for the rest.
3728 if (flush_data->size == HIGH_WATER_MARK) {
3731 for_each_online_cpu(cpu)
3732 flush_unmaps_timeout(cpu);
3735 spin_lock_irqsave(&flush_data->lock, flags);
3737 iommu = domain_get_iommu(dom);
3738 iommu_id = iommu->seq_id;
3740 entry_id = flush_data->tables[iommu_id].next;
3741 ++(flush_data->tables[iommu_id].next);
3743 entry = &flush_data->tables[iommu_id].entries[entry_id];
3744 entry->domain = dom;
3745 entry->iova_pfn = iova_pfn;
3746 entry->nrpages = nrpages;
3747 entry->freelist = freelist;
3749 if (!flush_data->timer_on) {
3750 mod_timer(&flush_data->timer, jiffies + msecs_to_jiffies(10));
3751 flush_data->timer_on = 1;
3754 spin_unlock_irqrestore(&flush_data->lock, flags);
3759 static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
3761 struct dmar_domain *domain;
3762 unsigned long start_pfn, last_pfn;
3763 unsigned long nrpages;
3764 unsigned long iova_pfn;
3765 struct intel_iommu *iommu;
3766 struct page *freelist;
3768 if (iommu_no_mapping(dev))
3771 domain = find_domain(dev);
3774 iommu = domain_get_iommu(domain);
3776 iova_pfn = IOVA_PFN(dev_addr);
3778 nrpages = aligned_nrpages(dev_addr, size);
3779 start_pfn = mm_to_dma_pfn(iova_pfn);
3780 last_pfn = start_pfn + nrpages - 1;
3782 pr_debug("Device %s unmapping: pfn %lx-%lx\n",
3783 dev_name(dev), start_pfn, last_pfn);
3785 freelist = domain_unmap(domain, start_pfn, last_pfn);
3787 if (intel_iommu_strict) {
3788 iommu_flush_iotlb_psi(iommu, domain, start_pfn,
3789 nrpages, !freelist, 0);
3791 free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(nrpages));
3792 dma_free_pagelist(freelist);
3794 add_unmap(domain, iova_pfn, nrpages, freelist);
3796 * queue up the release of the unmap to save the 1/6th of the
3797 * cpu used up by the iotlb flush operation...
3802 static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
3803 size_t size, enum dma_data_direction dir,
3804 unsigned long attrs)
3806 intel_unmap(dev, dev_addr, size);
3809 static void *intel_alloc_coherent(struct device *dev, size_t size,
3810 dma_addr_t *dma_handle, gfp_t flags,
3811 unsigned long attrs)
3813 struct page *page = NULL;
3816 size = PAGE_ALIGN(size);
3817 order = get_order(size);
3819 if (!iommu_no_mapping(dev))
3820 flags &= ~(GFP_DMA | GFP_DMA32);
3821 else if (dev->coherent_dma_mask < dma_get_required_mask(dev)) {
3822 if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
3828 if (gfpflags_allow_blocking(flags)) {
3829 unsigned int count = size >> PAGE_SHIFT;
3831 page = dma_alloc_from_contiguous(dev, count, order);
3832 if (page && iommu_no_mapping(dev) &&
3833 page_to_phys(page) + size > dev->coherent_dma_mask) {
3834 dma_release_from_contiguous(dev, page, count);
3840 page = alloc_pages(flags, order);
3843 memset(page_address(page), 0, size);
3845 *dma_handle = __intel_map_single(dev, page_to_phys(page), size,
3847 dev->coherent_dma_mask);
3849 return page_address(page);
3850 if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
3851 __free_pages(page, order);
3856 static void intel_free_coherent(struct device *dev, size_t size, void *vaddr,
3857 dma_addr_t dma_handle, unsigned long attrs)
3860 struct page *page = virt_to_page(vaddr);
3862 size = PAGE_ALIGN(size);
3863 order = get_order(size);
3865 intel_unmap(dev, dma_handle, size);
3866 if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
3867 __free_pages(page, order);
3870 static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist,
3871 int nelems, enum dma_data_direction dir,
3872 unsigned long attrs)
3874 dma_addr_t startaddr = sg_dma_address(sglist) & PAGE_MASK;
3875 unsigned long nrpages = 0;
3876 struct scatterlist *sg;
3879 for_each_sg(sglist, sg, nelems, i) {
3880 nrpages += aligned_nrpages(sg_dma_address(sg), sg_dma_len(sg));
3883 intel_unmap(dev, startaddr, nrpages << VTD_PAGE_SHIFT);
3886 static int intel_nontranslate_map_sg(struct device *hddev,
3887 struct scatterlist *sglist, int nelems, int dir)
3890 struct scatterlist *sg;
3892 for_each_sg(sglist, sg, nelems, i) {
3893 BUG_ON(!sg_page(sg));
3894 sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset;
3895 sg->dma_length = sg->length;
3900 static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nelems,
3901 enum dma_data_direction dir, unsigned long attrs)
3904 struct dmar_domain *domain;
3907 unsigned long iova_pfn;
3909 struct scatterlist *sg;
3910 unsigned long start_vpfn;
3911 struct intel_iommu *iommu;
3913 BUG_ON(dir == DMA_NONE);
3914 if (iommu_no_mapping(dev))
3915 return intel_nontranslate_map_sg(dev, sglist, nelems, dir);
3917 domain = get_valid_domain_for_dev(dev);
3921 iommu = domain_get_iommu(domain);
3923 for_each_sg(sglist, sg, nelems, i)
3924 size += aligned_nrpages(sg->offset, sg->length);
3926 iova_pfn = intel_alloc_iova(dev, domain, dma_to_mm_pfn(size),
3929 sglist->dma_length = 0;
3934 * Check if DMAR supports zero-length reads on write only
3937 if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \
3938 !cap_zlr(iommu->cap))
3939 prot |= DMA_PTE_READ;
3940 if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
3941 prot |= DMA_PTE_WRITE;
3943 start_vpfn = mm_to_dma_pfn(iova_pfn);
3945 ret = domain_sg_mapping(domain, start_vpfn, sglist, size, prot);
3946 if (unlikely(ret)) {
3947 dma_pte_free_pagetable(domain, start_vpfn,
3948 start_vpfn + size - 1);
3949 free_iova_fast(&domain->iovad, iova_pfn, dma_to_mm_pfn(size));
3953 /* it's a non-present to present mapping. Only flush if caching mode */
3954 if (cap_caching_mode(iommu->cap))
3955 iommu_flush_iotlb_psi(iommu, domain, start_vpfn, size, 0, 1);
3957 iommu_flush_write_buffer(iommu);
3962 static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr)
3967 struct dma_map_ops intel_dma_ops = {
3968 .alloc = intel_alloc_coherent,
3969 .free = intel_free_coherent,
3970 .map_sg = intel_map_sg,
3971 .unmap_sg = intel_unmap_sg,
3972 .map_page = intel_map_page,
3973 .unmap_page = intel_unmap_page,
3974 .mapping_error = intel_mapping_error,
3977 static inline int iommu_domain_cache_init(void)
3981 iommu_domain_cache = kmem_cache_create("iommu_domain",
3982 sizeof(struct dmar_domain),
3987 if (!iommu_domain_cache) {
3988 pr_err("Couldn't create iommu_domain cache\n");
3995 static inline int iommu_devinfo_cache_init(void)
3999 iommu_devinfo_cache = kmem_cache_create("iommu_devinfo",
4000 sizeof(struct device_domain_info),
4004 if (!iommu_devinfo_cache) {
4005 pr_err("Couldn't create devinfo cache\n");
4012 static int __init iommu_init_mempool(void)
4015 ret = iova_cache_get();
4019 ret = iommu_domain_cache_init();
4023 ret = iommu_devinfo_cache_init();
4027 kmem_cache_destroy(iommu_domain_cache);
4034 static void __init iommu_exit_mempool(void)
4036 kmem_cache_destroy(iommu_devinfo_cache);
4037 kmem_cache_destroy(iommu_domain_cache);
4041 static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev)
4043 struct dmar_drhd_unit *drhd;
4047 /* We know that this device on this chipset has its own IOMMU.
4048 * If we find it under a different IOMMU, then the BIOS is lying
4049 * to us. Hope that the IOMMU for this device is actually
4050 * disabled, and it needs no translation...
4052 rc = pci_bus_read_config_dword(pdev->bus, PCI_DEVFN(0, 0), 0xb0, &vtbar);
4054 /* "can't" happen */
4055 dev_info(&pdev->dev, "failed to run vt-d quirk\n");
4058 vtbar &= 0xffff0000;
4060 /* we know that the this iommu should be at offset 0xa000 from vtbar */
4061 drhd = dmar_find_matched_drhd_unit(pdev);
4062 if (WARN_TAINT_ONCE(!drhd || drhd->reg_base_addr - vtbar != 0xa000,
4063 TAINT_FIRMWARE_WORKAROUND,
4064 "BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n"))
4065 pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
4067 DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB, quirk_ioat_snb_local_iommu);
4069 static void __init init_no_remapping_devices(void)
4071 struct dmar_drhd_unit *drhd;
4075 for_each_drhd_unit(drhd) {
4076 if (!drhd->include_all) {
4077 for_each_active_dev_scope(drhd->devices,
4078 drhd->devices_cnt, i, dev)
4080 /* ignore DMAR unit if no devices exist */
4081 if (i == drhd->devices_cnt)
4086 for_each_active_drhd_unit(drhd) {
4087 if (drhd->include_all)
4090 for_each_active_dev_scope(drhd->devices,
4091 drhd->devices_cnt, i, dev)
4092 if (!dev_is_pci(dev) || !IS_GFX_DEVICE(to_pci_dev(dev)))
4094 if (i < drhd->devices_cnt)
4097 /* This IOMMU has *only* gfx devices. Either bypass it or
4098 set the gfx_mapped flag, as appropriate */
4100 intel_iommu_gfx_mapped = 1;
4103 for_each_active_dev_scope(drhd->devices,
4104 drhd->devices_cnt, i, dev)
4105 dev->archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
4110 #ifdef CONFIG_SUSPEND
4111 static int init_iommu_hw(void)
4113 struct dmar_drhd_unit *drhd;
4114 struct intel_iommu *iommu = NULL;
4116 for_each_active_iommu(iommu, drhd)
4118 dmar_reenable_qi(iommu);
4120 for_each_iommu(iommu, drhd) {
4121 if (drhd->ignored) {
4123 * we always have to disable PMRs or DMA may fail on
4127 iommu_disable_protect_mem_regions(iommu);
4131 iommu_flush_write_buffer(iommu);
4133 iommu_set_root_entry(iommu);
4135 iommu->flush.flush_context(iommu, 0, 0, 0,
4136 DMA_CCMD_GLOBAL_INVL);
4137 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
4138 iommu_enable_translation(iommu);
4139 iommu_disable_protect_mem_regions(iommu);
4145 static void iommu_flush_all(void)
4147 struct dmar_drhd_unit *drhd;
4148 struct intel_iommu *iommu;
4150 for_each_active_iommu(iommu, drhd) {
4151 iommu->flush.flush_context(iommu, 0, 0, 0,
4152 DMA_CCMD_GLOBAL_INVL);
4153 iommu->flush.flush_iotlb(iommu, 0, 0, 0,
4154 DMA_TLB_GLOBAL_FLUSH);
4158 static int iommu_suspend(void)
4160 struct dmar_drhd_unit *drhd;
4161 struct intel_iommu *iommu = NULL;
4164 for_each_active_iommu(iommu, drhd) {
4165 iommu->iommu_state = kzalloc(sizeof(u32) * MAX_SR_DMAR_REGS,
4167 if (!iommu->iommu_state)
4173 for_each_active_iommu(iommu, drhd) {
4174 iommu_disable_translation(iommu);
4176 raw_spin_lock_irqsave(&iommu->register_lock, flag);
4178 iommu->iommu_state[SR_DMAR_FECTL_REG] =
4179 readl(iommu->reg + DMAR_FECTL_REG);
4180 iommu->iommu_state[SR_DMAR_FEDATA_REG] =
4181 readl(iommu->reg + DMAR_FEDATA_REG);
4182 iommu->iommu_state[SR_DMAR_FEADDR_REG] =
4183 readl(iommu->reg + DMAR_FEADDR_REG);
4184 iommu->iommu_state[SR_DMAR_FEUADDR_REG] =
4185 readl(iommu->reg + DMAR_FEUADDR_REG);
4187 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
4192 for_each_active_iommu(iommu, drhd)
4193 kfree(iommu->iommu_state);
4198 static void iommu_resume(void)
4200 struct dmar_drhd_unit *drhd;
4201 struct intel_iommu *iommu = NULL;
4204 if (init_iommu_hw()) {
4206 panic("tboot: IOMMU setup failed, DMAR can not resume!\n");
4208 WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
4212 for_each_active_iommu(iommu, drhd) {
4214 raw_spin_lock_irqsave(&iommu->register_lock, flag);
4216 writel(iommu->iommu_state[SR_DMAR_FECTL_REG],
4217 iommu->reg + DMAR_FECTL_REG);
4218 writel(iommu->iommu_state[SR_DMAR_FEDATA_REG],
4219 iommu->reg + DMAR_FEDATA_REG);
4220 writel(iommu->iommu_state[SR_DMAR_FEADDR_REG],
4221 iommu->reg + DMAR_FEADDR_REG);
4222 writel(iommu->iommu_state[SR_DMAR_FEUADDR_REG],
4223 iommu->reg + DMAR_FEUADDR_REG);
4225 raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
4228 for_each_active_iommu(iommu, drhd)
4229 kfree(iommu->iommu_state);
4232 static struct syscore_ops iommu_syscore_ops = {
4233 .resume = iommu_resume,
4234 .suspend = iommu_suspend,
4237 static void __init init_iommu_pm_ops(void)
4239 register_syscore_ops(&iommu_syscore_ops);
4243 static inline void init_iommu_pm_ops(void) {}
4244 #endif /* CONFIG_PM */
4247 int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
4249 struct acpi_dmar_reserved_memory *rmrr;
4250 struct dmar_rmrr_unit *rmrru;
4252 rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
4256 rmrru->hdr = header;
4257 rmrr = (struct acpi_dmar_reserved_memory *)header;
4258 rmrru->base_address = rmrr->base_address;
4259 rmrru->end_address = rmrr->end_address;
4260 rmrru->devices = dmar_alloc_dev_scope((void *)(rmrr + 1),
4261 ((void *)rmrr) + rmrr->header.length,
4262 &rmrru->devices_cnt);
4263 if (rmrru->devices_cnt && rmrru->devices == NULL) {
4268 list_add(&rmrru->list, &dmar_rmrr_units);
4273 static struct dmar_atsr_unit *dmar_find_atsr(struct acpi_dmar_atsr *atsr)
4275 struct dmar_atsr_unit *atsru;
4276 struct acpi_dmar_atsr *tmp;
4278 list_for_each_entry_rcu(atsru, &dmar_atsr_units, list) {
4279 tmp = (struct acpi_dmar_atsr *)atsru->hdr;
4280 if (atsr->segment != tmp->segment)
4282 if (atsr->header.length != tmp->header.length)
4284 if (memcmp(atsr, tmp, atsr->header.length) == 0)
4291 int dmar_parse_one_atsr(struct acpi_dmar_header *hdr, void *arg)
4293 struct acpi_dmar_atsr *atsr;
4294 struct dmar_atsr_unit *atsru;
4296 if (system_state != SYSTEM_BOOTING && !intel_iommu_enabled)
4299 atsr = container_of(hdr, struct acpi_dmar_atsr, header);
4300 atsru = dmar_find_atsr(atsr);
4304 atsru = kzalloc(sizeof(*atsru) + hdr->length, GFP_KERNEL);
4309 * If memory is allocated from slab by ACPI _DSM method, we need to
4310 * copy the memory content because the memory buffer will be freed
4313 atsru->hdr = (void *)(atsru + 1);
4314 memcpy(atsru->hdr, hdr, hdr->length);
4315 atsru->include_all = atsr->flags & 0x1;
4316 if (!atsru->include_all) {
4317 atsru->devices = dmar_alloc_dev_scope((void *)(atsr + 1),
4318 (void *)atsr + atsr->header.length,
4319 &atsru->devices_cnt);
4320 if (atsru->devices_cnt && atsru->devices == NULL) {
4326 list_add_rcu(&atsru->list, &dmar_atsr_units);
4331 static void intel_iommu_free_atsr(struct dmar_atsr_unit *atsru)
4333 dmar_free_dev_scope(&atsru->devices, &atsru->devices_cnt);
4337 int dmar_release_one_atsr(struct acpi_dmar_header *hdr, void *arg)
4339 struct acpi_dmar_atsr *atsr;
4340 struct dmar_atsr_unit *atsru;
4342 atsr = container_of(hdr, struct acpi_dmar_atsr, header);
4343 atsru = dmar_find_atsr(atsr);
4345 list_del_rcu(&atsru->list);
4347 intel_iommu_free_atsr(atsru);
4353 int dmar_check_one_atsr(struct acpi_dmar_header *hdr, void *arg)
4357 struct acpi_dmar_atsr *atsr;
4358 struct dmar_atsr_unit *atsru;
4360 atsr = container_of(hdr, struct acpi_dmar_atsr, header);
4361 atsru = dmar_find_atsr(atsr);
4365 if (!atsru->include_all && atsru->devices && atsru->devices_cnt) {
4366 for_each_active_dev_scope(atsru->devices, atsru->devices_cnt,
4374 static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
4377 struct intel_iommu *iommu = dmaru->iommu;
4379 if (g_iommus[iommu->seq_id])
4382 if (hw_pass_through && !ecap_pass_through(iommu->ecap)) {
4383 pr_warn("%s: Doesn't support hardware pass through.\n",
4387 if (!ecap_sc_support(iommu->ecap) &&
4388 domain_update_iommu_snooping(iommu)) {
4389 pr_warn("%s: Doesn't support snooping.\n",
4393 sp = domain_update_iommu_superpage(iommu) - 1;
4394 if (sp >= 0 && !(cap_super_page_val(iommu->cap) & (1 << sp))) {
4395 pr_warn("%s: Doesn't support large page.\n",
4401 * Disable translation if already enabled prior to OS handover.
4403 if (iommu->gcmd & DMA_GCMD_TE)
4404 iommu_disable_translation(iommu);
4406 g_iommus[iommu->seq_id] = iommu;
4407 ret = iommu_init_domains(iommu);
4409 ret = iommu_alloc_root_entry(iommu);
4413 #ifdef CONFIG_INTEL_IOMMU_SVM
4414 if (pasid_enabled(iommu))
4415 intel_svm_alloc_pasid_tables(iommu);
4418 if (dmaru->ignored) {
4420 * we always have to disable PMRs or DMA may fail on this device
4423 iommu_disable_protect_mem_regions(iommu);
4427 intel_iommu_init_qi(iommu);
4428 iommu_flush_write_buffer(iommu);
4430 #ifdef CONFIG_INTEL_IOMMU_SVM
4431 if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) {
4432 ret = intel_svm_enable_prq(iommu);
4437 ret = dmar_set_interrupt(iommu);
4441 iommu_set_root_entry(iommu);
4442 iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
4443 iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
4444 iommu_enable_translation(iommu);
4446 iommu_disable_protect_mem_regions(iommu);
4450 disable_dmar_iommu(iommu);
4452 free_dmar_iommu(iommu);
4456 int dmar_iommu_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
4459 struct intel_iommu *iommu = dmaru->iommu;
4461 if (!intel_iommu_enabled)
4467 ret = intel_iommu_add(dmaru);
4469 disable_dmar_iommu(iommu);
4470 free_dmar_iommu(iommu);
4476 static void intel_iommu_free_dmars(void)
4478 struct dmar_rmrr_unit *rmrru, *rmrr_n;
4479 struct dmar_atsr_unit *atsru, *atsr_n;
4481 list_for_each_entry_safe(rmrru, rmrr_n, &dmar_rmrr_units, list) {
4482 list_del(&rmrru->list);
4483 dmar_free_dev_scope(&rmrru->devices, &rmrru->devices_cnt);
4487 list_for_each_entry_safe(atsru, atsr_n, &dmar_atsr_units, list) {
4488 list_del(&atsru->list);
4489 intel_iommu_free_atsr(atsru);
4493 int dmar_find_matched_atsr_unit(struct pci_dev *dev)
4496 struct pci_bus *bus;
4497 struct pci_dev *bridge = NULL;
4499 struct acpi_dmar_atsr *atsr;
4500 struct dmar_atsr_unit *atsru;
4502 dev = pci_physfn(dev);
4503 for (bus = dev->bus; bus; bus = bus->parent) {
4505 /* If it's an integrated device, allow ATS */
4508 /* Connected via non-PCIe: no ATS */
4509 if (!pci_is_pcie(bridge) ||
4510 pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE)
4512 /* If we found the root port, look it up in the ATSR */
4513 if (pci_pcie_type(bridge) == PCI_EXP_TYPE_ROOT_PORT)
4518 list_for_each_entry_rcu(atsru, &dmar_atsr_units, list) {
4519 atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
4520 if (atsr->segment != pci_domain_nr(dev->bus))
4523 for_each_dev_scope(atsru->devices, atsru->devices_cnt, i, tmp)
4524 if (tmp == &bridge->dev)
4527 if (atsru->include_all)
4537 int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
4540 struct dmar_rmrr_unit *rmrru;
4541 struct dmar_atsr_unit *atsru;
4542 struct acpi_dmar_atsr *atsr;
4543 struct acpi_dmar_reserved_memory *rmrr;
4545 if (!intel_iommu_enabled && system_state != SYSTEM_BOOTING)
4548 list_for_each_entry(rmrru, &dmar_rmrr_units, list) {
4549 rmrr = container_of(rmrru->hdr,
4550 struct acpi_dmar_reserved_memory, header);
4551 if (info->event == BUS_NOTIFY_ADD_DEVICE) {
4552 ret = dmar_insert_dev_scope(info, (void *)(rmrr + 1),
4553 ((void *)rmrr) + rmrr->header.length,
4554 rmrr->segment, rmrru->devices,
4555 rmrru->devices_cnt);
4558 } else if (info->event == BUS_NOTIFY_REMOVED_DEVICE) {
4559 dmar_remove_dev_scope(info, rmrr->segment,
4560 rmrru->devices, rmrru->devices_cnt);
4564 list_for_each_entry(atsru, &dmar_atsr_units, list) {
4565 if (atsru->include_all)
4568 atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
4569 if (info->event == BUS_NOTIFY_ADD_DEVICE) {
4570 ret = dmar_insert_dev_scope(info, (void *)(atsr + 1),
4571 (void *)atsr + atsr->header.length,
4572 atsr->segment, atsru->devices,
4573 atsru->devices_cnt);
4578 } else if (info->event == BUS_NOTIFY_REMOVED_DEVICE) {
4579 if (dmar_remove_dev_scope(info, atsr->segment,
4580 atsru->devices, atsru->devices_cnt))
4589 * Here we only respond to action of unbound device from driver.
4591 * Added device is not attached to its DMAR domain here yet. That will happen
4592 * when mapping the device to iova.
4594 static int device_notifier(struct notifier_block *nb,
4595 unsigned long action, void *data)
4597 struct device *dev = data;
4598 struct dmar_domain *domain;
4600 if (iommu_dummy(dev))
4603 if (action != BUS_NOTIFY_REMOVED_DEVICE)
4606 domain = find_domain(dev);
4610 dmar_remove_one_dev_info(domain, dev);
4611 if (!domain_type_is_vm_or_si(domain) && list_empty(&domain->devices))
4612 domain_exit(domain);
4617 static struct notifier_block device_nb = {
4618 .notifier_call = device_notifier,
4621 static int intel_iommu_memory_notifier(struct notifier_block *nb,
4622 unsigned long val, void *v)
4624 struct memory_notify *mhp = v;
4625 unsigned long long start, end;
4626 unsigned long start_vpfn, last_vpfn;
4629 case MEM_GOING_ONLINE:
4630 start = mhp->start_pfn << PAGE_SHIFT;
4631 end = ((mhp->start_pfn + mhp->nr_pages) << PAGE_SHIFT) - 1;
4632 if (iommu_domain_identity_map(si_domain, start, end)) {
4633 pr_warn("Failed to build identity map for [%llx-%llx]\n",
4640 case MEM_CANCEL_ONLINE:
4641 start_vpfn = mm_to_dma_pfn(mhp->start_pfn);
4642 last_vpfn = mm_to_dma_pfn(mhp->start_pfn + mhp->nr_pages - 1);
4643 while (start_vpfn <= last_vpfn) {
4645 struct dmar_drhd_unit *drhd;
4646 struct intel_iommu *iommu;
4647 struct page *freelist;
4649 iova = find_iova(&si_domain->iovad, start_vpfn);
4651 pr_debug("Failed get IOVA for PFN %lx\n",
4656 iova = split_and_remove_iova(&si_domain->iovad, iova,
4657 start_vpfn, last_vpfn);
4659 pr_warn("Failed to split IOVA PFN [%lx-%lx]\n",
4660 start_vpfn, last_vpfn);
4664 freelist = domain_unmap(si_domain, iova->pfn_lo,
4668 for_each_active_iommu(iommu, drhd)
4669 iommu_flush_iotlb_psi(iommu, si_domain,
4670 iova->pfn_lo, iova_size(iova),
4673 dma_free_pagelist(freelist);
4675 start_vpfn = iova->pfn_hi + 1;
4676 free_iova_mem(iova);
4684 static struct notifier_block intel_iommu_memory_nb = {
4685 .notifier_call = intel_iommu_memory_notifier,
4689 static void free_all_cpu_cached_iovas(unsigned int cpu)
4693 for (i = 0; i < g_num_of_iommus; i++) {
4694 struct intel_iommu *iommu = g_iommus[i];
4695 struct dmar_domain *domain;
4701 for (did = 0; did < cap_ndoms(iommu->cap); did++) {
4702 domain = get_iommu_domain(iommu, (u16)did);
4706 free_cpu_cached_iovas(cpu, &domain->iovad);
4711 static int intel_iommu_cpu_dead(unsigned int cpu)
4713 free_all_cpu_cached_iovas(cpu);
4714 flush_unmaps_timeout(cpu);
4718 static ssize_t intel_iommu_show_version(struct device *dev,
4719 struct device_attribute *attr,
4722 struct intel_iommu *iommu = dev_get_drvdata(dev);
4723 u32 ver = readl(iommu->reg + DMAR_VER_REG);
4724 return sprintf(buf, "%d:%d\n",
4725 DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver));
4727 static DEVICE_ATTR(version, S_IRUGO, intel_iommu_show_version, NULL);
4729 static ssize_t intel_iommu_show_address(struct device *dev,
4730 struct device_attribute *attr,
4733 struct intel_iommu *iommu = dev_get_drvdata(dev);
4734 return sprintf(buf, "%llx\n", iommu->reg_phys);
4736 static DEVICE_ATTR(address, S_IRUGO, intel_iommu_show_address, NULL);
4738 static ssize_t intel_iommu_show_cap(struct device *dev,
4739 struct device_attribute *attr,
4742 struct intel_iommu *iommu = dev_get_drvdata(dev);
4743 return sprintf(buf, "%llx\n", iommu->cap);
4745 static DEVICE_ATTR(cap, S_IRUGO, intel_iommu_show_cap, NULL);
4747 static ssize_t intel_iommu_show_ecap(struct device *dev,
4748 struct device_attribute *attr,
4751 struct intel_iommu *iommu = dev_get_drvdata(dev);
4752 return sprintf(buf, "%llx\n", iommu->ecap);
4754 static DEVICE_ATTR(ecap, S_IRUGO, intel_iommu_show_ecap, NULL);
4756 static ssize_t intel_iommu_show_ndoms(struct device *dev,
4757 struct device_attribute *attr,
4760 struct intel_iommu *iommu = dev_get_drvdata(dev);
4761 return sprintf(buf, "%ld\n", cap_ndoms(iommu->cap));
4763 static DEVICE_ATTR(domains_supported, S_IRUGO, intel_iommu_show_ndoms, NULL);
4765 static ssize_t intel_iommu_show_ndoms_used(struct device *dev,
4766 struct device_attribute *attr,
4769 struct intel_iommu *iommu = dev_get_drvdata(dev);
4770 return sprintf(buf, "%d\n", bitmap_weight(iommu->domain_ids,
4771 cap_ndoms(iommu->cap)));
4773 static DEVICE_ATTR(domains_used, S_IRUGO, intel_iommu_show_ndoms_used, NULL);
4775 static struct attribute *intel_iommu_attrs[] = {
4776 &dev_attr_version.attr,
4777 &dev_attr_address.attr,
4779 &dev_attr_ecap.attr,
4780 &dev_attr_domains_supported.attr,
4781 &dev_attr_domains_used.attr,
4785 static struct attribute_group intel_iommu_group = {
4786 .name = "intel-iommu",
4787 .attrs = intel_iommu_attrs,
4790 const struct attribute_group *intel_iommu_groups[] = {
4795 int __init intel_iommu_init(void)
4798 struct dmar_drhd_unit *drhd;
4799 struct intel_iommu *iommu;
4801 /* VT-d is required for a TXT/tboot launch, so enforce that */
4802 force_on = tboot_force_iommu();
4804 if (iommu_init_mempool()) {
4806 panic("tboot: Failed to initialize iommu memory\n");
4810 down_write(&dmar_global_lock);
4811 if (dmar_table_init()) {
4813 panic("tboot: Failed to initialize DMAR table\n");
4817 if (dmar_dev_scope_init() < 0) {
4819 panic("tboot: Failed to initialize DMAR device scope\n");
4823 if (no_iommu || dmar_disabled)
4826 if (list_empty(&dmar_rmrr_units))
4827 pr_info("No RMRR found\n");
4829 if (list_empty(&dmar_atsr_units))
4830 pr_info("No ATSR found\n");
4832 if (dmar_init_reserved_ranges()) {
4834 panic("tboot: Failed to reserve iommu ranges\n");
4835 goto out_free_reserved_range;
4838 init_no_remapping_devices();
4843 panic("tboot: Failed to initialize DMARs\n");
4844 pr_err("Initialization failed\n");
4845 goto out_free_reserved_range;
4847 up_write(&dmar_global_lock);
4848 pr_info("Intel(R) Virtualization Technology for Directed I/O\n");
4850 #ifdef CONFIG_SWIOTLB
4853 dma_ops = &intel_dma_ops;
4855 init_iommu_pm_ops();
4857 for_each_active_iommu(iommu, drhd)
4858 iommu->iommu_dev = iommu_device_create(NULL, iommu,
4862 bus_set_iommu(&pci_bus_type, &intel_iommu_ops);
4863 bus_register_notifier(&pci_bus_type, &device_nb);
4864 if (si_domain && !hw_pass_through)
4865 register_memory_notifier(&intel_iommu_memory_nb);
4866 cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL,
4867 intel_iommu_cpu_dead);
4868 intel_iommu_enabled = 1;
4872 out_free_reserved_range:
4873 put_iova_domain(&reserved_iova_list);
4875 intel_iommu_free_dmars();
4876 up_write(&dmar_global_lock);
4877 iommu_exit_mempool();
4881 static int domain_context_clear_one_cb(struct pci_dev *pdev, u16 alias, void *opaque)
4883 struct intel_iommu *iommu = opaque;
4885 domain_context_clear_one(iommu, PCI_BUS_NUM(alias), alias & 0xff);
4890 * NB - intel-iommu lacks any sort of reference counting for the users of
4891 * dependent devices. If multiple endpoints have intersecting dependent
4892 * devices, unbinding the driver from any one of them will possibly leave
4893 * the others unable to operate.
4895 static void domain_context_clear(struct intel_iommu *iommu, struct device *dev)
4897 if (!iommu || !dev || !dev_is_pci(dev))
4900 pci_for_each_dma_alias(to_pci_dev(dev), &domain_context_clear_one_cb, iommu);
4903 static void __dmar_remove_one_dev_info(struct device_domain_info *info)
4905 struct intel_iommu *iommu;
4906 unsigned long flags;
4908 assert_spin_locked(&device_domain_lock);
4913 iommu = info->iommu;
4916 iommu_disable_dev_iotlb(info);
4917 domain_context_clear(iommu, info->dev);
4920 unlink_domain_info(info);
4922 spin_lock_irqsave(&iommu->lock, flags);
4923 domain_detach_iommu(info->domain, iommu);
4924 spin_unlock_irqrestore(&iommu->lock, flags);
4926 free_devinfo_mem(info);
4929 static void dmar_remove_one_dev_info(struct dmar_domain *domain,
4932 struct device_domain_info *info;
4933 unsigned long flags;
4935 spin_lock_irqsave(&device_domain_lock, flags);
4936 info = dev->archdata.iommu;
4937 __dmar_remove_one_dev_info(info);
4938 spin_unlock_irqrestore(&device_domain_lock, flags);
4941 static int md_domain_init(struct dmar_domain *domain, int guest_width)
4945 init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN,
4947 domain_reserve_special_ranges(domain);
4949 /* calculate AGAW */
4950 domain->gaw = guest_width;
4951 adjust_width = guestwidth_to_adjustwidth(guest_width);
4952 domain->agaw = width_to_agaw(adjust_width);
4954 domain->iommu_coherency = 0;
4955 domain->iommu_snooping = 0;
4956 domain->iommu_superpage = 0;
4957 domain->max_addr = 0;
4959 /* always allocate the top pgd */
4960 domain->pgd = (struct dma_pte *)alloc_pgtable_page(domain->nid);
4963 domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
4967 static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
4969 struct dmar_domain *dmar_domain;
4970 struct iommu_domain *domain;
4972 if (type != IOMMU_DOMAIN_UNMANAGED)
4975 dmar_domain = alloc_domain(DOMAIN_FLAG_VIRTUAL_MACHINE);
4977 pr_err("Can't allocate dmar_domain\n");
4980 if (md_domain_init(dmar_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) {
4981 pr_err("Domain initialization failed\n");
4982 domain_exit(dmar_domain);
4985 domain_update_iommu_cap(dmar_domain);
4987 domain = &dmar_domain->domain;
4988 domain->geometry.aperture_start = 0;
4989 domain->geometry.aperture_end = __DOMAIN_MAX_ADDR(dmar_domain->gaw);
4990 domain->geometry.force_aperture = true;
4995 static void intel_iommu_domain_free(struct iommu_domain *domain)
4997 domain_exit(to_dmar_domain(domain));
5000 static int intel_iommu_attach_device(struct iommu_domain *domain,
5003 struct dmar_domain *dmar_domain = to_dmar_domain(domain);
5004 struct intel_iommu *iommu;
5008 if (device_is_rmrr_locked(dev)) {
5009 dev_warn(dev, "Device is ineligible for IOMMU domain attach due to platform RMRR requirement. Contact your platform vendor.\n");
5013 /* normally dev is not mapped */
5014 if (unlikely(domain_context_mapped(dev))) {
5015 struct dmar_domain *old_domain;
5017 old_domain = find_domain(dev);
5020 dmar_remove_one_dev_info(old_domain, dev);
5023 if (!domain_type_is_vm_or_si(old_domain) &&
5024 list_empty(&old_domain->devices))
5025 domain_exit(old_domain);
5029 iommu = device_to_iommu(dev, &bus, &devfn);
5033 /* check if this iommu agaw is sufficient for max mapped address */
5034 addr_width = agaw_to_width(iommu->agaw);
5035 if (addr_width > cap_mgaw(iommu->cap))
5036 addr_width = cap_mgaw(iommu->cap);
5038 if (dmar_domain->max_addr > (1LL << addr_width)) {
5039 pr_err("%s: iommu width (%d) is not "
5040 "sufficient for the mapped address (%llx)\n",
5041 __func__, addr_width, dmar_domain->max_addr);
5044 dmar_domain->gaw = addr_width;
5047 * Knock out extra levels of page tables if necessary
5049 while (iommu->agaw < dmar_domain->agaw) {
5050 struct dma_pte *pte;
5052 pte = dmar_domain->pgd;
5053 if (dma_pte_present(pte)) {
5054 dmar_domain->pgd = (struct dma_pte *)
5055 phys_to_virt(dma_pte_addr(pte));
5056 free_pgtable_page(pte);
5058 dmar_domain->agaw--;
5061 return domain_add_dev_info(dmar_domain, dev);
5064 static void intel_iommu_detach_device(struct iommu_domain *domain,
5067 dmar_remove_one_dev_info(to_dmar_domain(domain), dev);
5070 static int intel_iommu_map(struct iommu_domain *domain,
5071 unsigned long iova, phys_addr_t hpa,
5072 size_t size, int iommu_prot)
5074 struct dmar_domain *dmar_domain = to_dmar_domain(domain);
5079 if (iommu_prot & IOMMU_READ)
5080 prot |= DMA_PTE_READ;
5081 if (iommu_prot & IOMMU_WRITE)
5082 prot |= DMA_PTE_WRITE;
5083 if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping)
5084 prot |= DMA_PTE_SNP;
5086 max_addr = iova + size;
5087 if (dmar_domain->max_addr < max_addr) {
5090 /* check if minimum agaw is sufficient for mapped address */
5091 end = __DOMAIN_MAX_ADDR(dmar_domain->gaw) + 1;
5092 if (end < max_addr) {
5093 pr_err("%s: iommu width (%d) is not "
5094 "sufficient for the mapped address (%llx)\n",
5095 __func__, dmar_domain->gaw, max_addr);
5098 dmar_domain->max_addr = max_addr;
5100 /* Round up size to next multiple of PAGE_SIZE, if it and
5101 the low bits of hpa would take us onto the next page */
5102 size = aligned_nrpages(hpa, size);
5103 ret = domain_pfn_mapping(dmar_domain, iova >> VTD_PAGE_SHIFT,
5104 hpa >> VTD_PAGE_SHIFT, size, prot);
5108 static size_t intel_iommu_unmap(struct iommu_domain *domain,
5109 unsigned long iova, size_t size)
5111 struct dmar_domain *dmar_domain = to_dmar_domain(domain);
5112 struct page *freelist = NULL;
5113 struct intel_iommu *iommu;
5114 unsigned long start_pfn, last_pfn;
5115 unsigned int npages;
5116 int iommu_id, level = 0;
5118 /* Cope with horrid API which requires us to unmap more than the
5119 size argument if it happens to be a large-page mapping. */
5120 BUG_ON(!pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level));
5122 if (size < VTD_PAGE_SIZE << level_to_offset_bits(level))
5123 size = VTD_PAGE_SIZE << level_to_offset_bits(level);
5125 start_pfn = iova >> VTD_PAGE_SHIFT;
5126 last_pfn = (iova + size - 1) >> VTD_PAGE_SHIFT;
5128 freelist = domain_unmap(dmar_domain, start_pfn, last_pfn);
5130 npages = last_pfn - start_pfn + 1;
5132 for_each_domain_iommu(iommu_id, dmar_domain) {
5133 iommu = g_iommus[iommu_id];
5135 iommu_flush_iotlb_psi(g_iommus[iommu_id], dmar_domain,
5136 start_pfn, npages, !freelist, 0);
5139 dma_free_pagelist(freelist);
5141 if (dmar_domain->max_addr == iova + size)
5142 dmar_domain->max_addr = iova;
5147 static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain,
5150 struct dmar_domain *dmar_domain = to_dmar_domain(domain);
5151 struct dma_pte *pte;
5155 pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, &level);
5157 phys = dma_pte_addr(pte);
5162 static bool intel_iommu_capable(enum iommu_cap cap)
5164 if (cap == IOMMU_CAP_CACHE_COHERENCY)
5165 return domain_update_iommu_snooping(NULL) == 1;
5166 if (cap == IOMMU_CAP_INTR_REMAP)
5167 return irq_remapping_enabled == 1;
5172 static int intel_iommu_add_device(struct device *dev)
5174 struct intel_iommu *iommu;
5175 struct iommu_group *group;
5178 iommu = device_to_iommu(dev, &bus, &devfn);
5182 iommu_device_link(iommu->iommu_dev, dev);
5184 group = iommu_group_get_for_dev(dev);
5187 return PTR_ERR(group);
5189 iommu_group_put(group);
5193 static void intel_iommu_remove_device(struct device *dev)
5195 struct intel_iommu *iommu;
5198 iommu = device_to_iommu(dev, &bus, &devfn);
5202 iommu_group_remove_device(dev);
5204 iommu_device_unlink(iommu->iommu_dev, dev);
5207 #ifdef CONFIG_INTEL_IOMMU_SVM
5208 #define MAX_NR_PASID_BITS (20)
5209 static inline unsigned long intel_iommu_get_pts(struct intel_iommu *iommu)
5212 * Convert ecap_pss to extend context entry pts encoding, also
5213 * respect the soft pasid_max value set by the iommu.
5214 * - number of PASID bits = ecap_pss + 1
5215 * - number of PASID table entries = 2^(pts + 5)
5216 * Therefore, pts = ecap_pss - 4
5217 * e.g. KBL ecap_pss = 0x13, PASID has 20 bits, pts = 15
5219 if (ecap_pss(iommu->ecap) < 5)
5222 /* pasid_max is encoded as actual number of entries not the bits */
5223 return find_first_bit((unsigned long *)&iommu->pasid_max,
5224 MAX_NR_PASID_BITS) - 5;
5227 int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev)
5229 struct device_domain_info *info;
5230 struct context_entry *context;
5231 struct dmar_domain *domain;
5232 unsigned long flags;
5236 domain = get_valid_domain_for_dev(sdev->dev);
5240 spin_lock_irqsave(&device_domain_lock, flags);
5241 spin_lock(&iommu->lock);
5244 info = sdev->dev->archdata.iommu;
5245 if (!info || !info->pasid_supported)
5248 context = iommu_context_addr(iommu, info->bus, info->devfn, 0);
5249 if (WARN_ON(!context))
5252 ctx_lo = context[0].lo;
5254 sdev->did = domain->iommu_did[iommu->seq_id];
5255 sdev->sid = PCI_DEVID(info->bus, info->devfn);
5257 if (!(ctx_lo & CONTEXT_PASIDE)) {
5258 context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table);
5259 context[1].lo = (u64)virt_to_phys(iommu->pasid_table) |
5260 intel_iommu_get_pts(iommu);
5263 /* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB are both
5264 * extended to permit requests-with-PASID if the PASIDE bit
5265 * is set. which makes sense. For CONTEXT_TT_PASS_THROUGH,
5266 * however, the PASIDE bit is ignored and requests-with-PASID
5267 * are unconditionally blocked. Which makes less sense.
5268 * So convert from CONTEXT_TT_PASS_THROUGH to one of the new
5269 * "guest mode" translation types depending on whether ATS
5270 * is available or not. Annoyingly, we can't use the new
5271 * modes *unless* PASIDE is set. */
5272 if ((ctx_lo & CONTEXT_TT_MASK) == (CONTEXT_TT_PASS_THROUGH << 2)) {
5273 ctx_lo &= ~CONTEXT_TT_MASK;
5274 if (info->ats_supported)
5275 ctx_lo |= CONTEXT_TT_PT_PASID_DEV_IOTLB << 2;
5277 ctx_lo |= CONTEXT_TT_PT_PASID << 2;
5279 ctx_lo |= CONTEXT_PASIDE;
5280 if (iommu->pasid_state_table)
5281 ctx_lo |= CONTEXT_DINVE;
5282 if (info->pri_supported)
5283 ctx_lo |= CONTEXT_PRS;
5284 context[0].lo = ctx_lo;
5286 iommu->flush.flush_context(iommu, sdev->did, sdev->sid,
5287 DMA_CCMD_MASK_NOBIT,
5288 DMA_CCMD_DEVICE_INVL);
5291 /* Enable PASID support in the device, if it wasn't already */
5292 if (!info->pasid_enabled)
5293 iommu_enable_dev_iotlb(info);
5295 if (info->ats_enabled) {
5296 sdev->dev_iotlb = 1;
5297 sdev->qdep = info->ats_qdep;
5298 if (sdev->qdep >= QI_DEV_EIOTLB_MAX_INVS)
5304 spin_unlock(&iommu->lock);
5305 spin_unlock_irqrestore(&device_domain_lock, flags);
5310 struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
5312 struct intel_iommu *iommu;
5315 if (iommu_dummy(dev)) {
5317 "No IOMMU translation for device; cannot enable SVM\n");
5321 iommu = device_to_iommu(dev, &bus, &devfn);
5323 dev_err(dev, "No IOMMU for device; cannot enable SVM\n");
5327 if (!iommu->pasid_table) {
5328 dev_err(dev, "PASID not enabled on IOMMU; cannot enable SVM\n");
5334 #endif /* CONFIG_INTEL_IOMMU_SVM */
5336 static const struct iommu_ops intel_iommu_ops = {
5337 .capable = intel_iommu_capable,
5338 .domain_alloc = intel_iommu_domain_alloc,
5339 .domain_free = intel_iommu_domain_free,
5340 .attach_dev = intel_iommu_attach_device,
5341 .detach_dev = intel_iommu_detach_device,
5342 .map = intel_iommu_map,
5343 .unmap = intel_iommu_unmap,
5344 .map_sg = default_iommu_map_sg,
5345 .iova_to_phys = intel_iommu_iova_to_phys,
5346 .add_device = intel_iommu_add_device,
5347 .remove_device = intel_iommu_remove_device,
5348 .device_group = pci_device_group,
5349 .pgsize_bitmap = INTEL_IOMMU_PGSIZES,
5352 static void quirk_iommu_g4x_gfx(struct pci_dev *dev)
5354 /* G4x/GM45 integrated gfx dmar support is totally busted. */
5355 pr_info("Disabling IOMMU for graphics on this chipset\n");
5359 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_g4x_gfx);
5360 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_g4x_gfx);
5361 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e10, quirk_iommu_g4x_gfx);
5362 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e20, quirk_iommu_g4x_gfx);
5363 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e30, quirk_iommu_g4x_gfx);
5364 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e40, quirk_iommu_g4x_gfx);
5365 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e90, quirk_iommu_g4x_gfx);
5367 static void quirk_iommu_rwbf(struct pci_dev *dev)
5370 * Mobile 4 Series Chipset neglects to set RWBF capability,
5371 * but needs it. Same seems to hold for the desktop versions.
5373 pr_info("Forcing write-buffer flush capability\n");
5377 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf);
5378 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_rwbf);
5379 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e10, quirk_iommu_rwbf);
5380 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e20, quirk_iommu_rwbf);
5381 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e30, quirk_iommu_rwbf);
5382 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e40, quirk_iommu_rwbf);
5383 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e90, quirk_iommu_rwbf);
5386 #define GGC_MEMORY_SIZE_MASK (0xf << 8)
5387 #define GGC_MEMORY_SIZE_NONE (0x0 << 8)
5388 #define GGC_MEMORY_SIZE_1M (0x1 << 8)
5389 #define GGC_MEMORY_SIZE_2M (0x3 << 8)
5390 #define GGC_MEMORY_VT_ENABLED (0x8 << 8)
5391 #define GGC_MEMORY_SIZE_2M_VT (0x9 << 8)
5392 #define GGC_MEMORY_SIZE_3M_VT (0xa << 8)
5393 #define GGC_MEMORY_SIZE_4M_VT (0xb << 8)
5395 static void quirk_calpella_no_shadow_gtt(struct pci_dev *dev)
5399 if (pci_read_config_word(dev, GGC, &ggc))
5402 if (!(ggc & GGC_MEMORY_VT_ENABLED)) {
5403 pr_info("BIOS has allocated no shadow GTT; disabling IOMMU for graphics\n");
5405 } else if (dmar_map_gfx) {
5406 /* we have to ensure the gfx device is idle before we flush */
5407 pr_info("Disabling batched IOTLB flush on Ironlake\n");
5408 intel_iommu_strict = 1;
5411 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0040, quirk_calpella_no_shadow_gtt);
5412 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0044, quirk_calpella_no_shadow_gtt);
5413 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0062, quirk_calpella_no_shadow_gtt);
5414 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x006a, quirk_calpella_no_shadow_gtt);
5416 /* On Tylersburg chipsets, some BIOSes have been known to enable the
5417 ISOCH DMAR unit for the Azalia sound device, but not give it any
5418 TLB entries, which causes it to deadlock. Check for that. We do
5419 this in a function called from init_dmars(), instead of in a PCI
5420 quirk, because we don't want to print the obnoxious "BIOS broken"
5421 message if VT-d is actually disabled.
5423 static void __init check_tylersburg_isoch(void)
5425 struct pci_dev *pdev;
5426 uint32_t vtisochctrl;
5428 /* If there's no Azalia in the system anyway, forget it. */
5429 pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x3a3e, NULL);
5434 /* System Management Registers. Might be hidden, in which case
5435 we can't do the sanity check. But that's OK, because the
5436 known-broken BIOSes _don't_ actually hide it, so far. */
5437 pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x342e, NULL);
5441 if (pci_read_config_dword(pdev, 0x188, &vtisochctrl)) {
5448 /* If Azalia DMA is routed to the non-isoch DMAR unit, fine. */
5449 if (vtisochctrl & 1)
5452 /* Drop all bits other than the number of TLB entries */
5453 vtisochctrl &= 0x1c;
5455 /* If we have the recommended number of TLB entries (16), fine. */
5456 if (vtisochctrl == 0x10)
5459 /* Zero TLB entries? You get to ride the short bus to school. */
5461 WARN(1, "Your BIOS is broken; DMA routed to ISOCH DMAR unit but no TLB space.\n"
5462 "BIOS vendor: %s; Ver: %s; Product Version: %s\n",
5463 dmi_get_system_info(DMI_BIOS_VENDOR),
5464 dmi_get_system_info(DMI_BIOS_VERSION),
5465 dmi_get_system_info(DMI_PRODUCT_VERSION));
5466 iommu_identity_mapping |= IDENTMAP_AZALIA;
5470 pr_warn("Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n",