| /* |
| * Copyright © 2006-2014 Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * Authors: David Woodhouse <dwmw2@infradead.org>, |
| * Ashok Raj <ashok.raj@intel.com>, |
| * Shaohua Li <shaohua.li@intel.com>, |
| * Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>, |
| * Fenghua Yu <fenghua.yu@intel.com> |
| * Joerg Roedel <jroedel@suse.de> |
| */ |
| |
| #define pr_fmt(fmt) "DMAR: " fmt |
| |
| #include <linux/init.h> |
| #include <linux/bitmap.h> |
| #include <linux/debugfs.h> |
| #include <linux/export.h> |
| #include <linux/slab.h> |
| #include <linux/irq.h> |
| #include <linux/interrupt.h> |
| #include <linux/spinlock.h> |
| #include <linux/pci.h> |
| #include <linux/dmar.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/mempool.h> |
| #include <linux/memory.h> |
| #include <linux/cpu.h> |
| #include <linux/timer.h> |
| #include <linux/io.h> |
| #include <linux/iova.h> |
| #include <linux/iommu.h> |
| #include <linux/intel-iommu.h> |
| #include <linux/syscore_ops.h> |
| #include <linux/tboot.h> |
| #include <linux/dmi.h> |
| #include <linux/pci-ats.h> |
| #include <linux/memblock.h> |
| #include <linux/dma-contiguous.h> |
| #include <linux/crash_dump.h> |
| #include <asm/irq_remapping.h> |
| #include <asm/cacheflush.h> |
| #include <asm/iommu.h> |
| |
| #include "irq_remapping.h" |
| |
| #define ROOT_SIZE VTD_PAGE_SIZE |
| #define CONTEXT_SIZE VTD_PAGE_SIZE |
| |
| #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) |
| #define IS_USB_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB) |
| #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) |
| #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e) |
| |
| #define IOAPIC_RANGE_START (0xfee00000) |
| #define IOAPIC_RANGE_END (0xfeefffff) |
| #define IOVA_START_ADDR (0x1000) |
| |
| #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48 |
| |
| #define MAX_AGAW_WIDTH 64 |
| #define MAX_AGAW_PFN_WIDTH (MAX_AGAW_WIDTH - VTD_PAGE_SHIFT) |
| |
| #define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << (gaw-VTD_PAGE_SHIFT)) - 1) |
| #define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << gaw) - 1) |
| |
| /* We limit DOMAIN_MAX_PFN to fit in an unsigned long, and DOMAIN_MAX_ADDR |
| to match. That way, we can use 'unsigned long' for PFNs with impunity. */ |
| #define DOMAIN_MAX_PFN(gaw) ((unsigned long) min_t(uint64_t, \ |
| __DOMAIN_MAX_PFN(gaw), (unsigned long)-1)) |
| #define DOMAIN_MAX_ADDR(gaw) (((uint64_t)__DOMAIN_MAX_PFN(gaw)) << VTD_PAGE_SHIFT) |
| |
| /* IO virtual address start page frame number */ |
| #define IOVA_START_PFN (1) |
| |
| #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT) |
| #define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32)) |
| #define DMA_64BIT_PFN IOVA_PFN(DMA_BIT_MASK(64)) |
| |
| /* page table handling */ |
| #define LEVEL_STRIDE (9) |
| #define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1) |
| |
| /* |
| * This bitmap is used to advertise the page sizes our hardware support |
| * to the IOMMU core, which will then use this information to split |
| * physically contiguous memory regions it is mapping into page sizes |
| * that we support. |
| * |
| * Traditionally the IOMMU core just handed us the mappings directly, |
| * after making sure the size is an order of a 4KiB page and that the |
| * mapping has natural alignment. |
| * |
| * To retain this behavior, we currently advertise that we support |
| * all page sizes that are an order of 4KiB. |
| * |
| * If at some point we'd like to utilize the IOMMU core's new behavior, |
| * we could change this to advertise the real page sizes we support. |
| */ |
| #define INTEL_IOMMU_PGSIZES (~0xFFFUL) |
| |
| static inline int agaw_to_level(int agaw) |
| { |
| return agaw + 2; |
| } |
| |
| static inline int agaw_to_width(int agaw) |
| { |
| return min_t(int, 30 + agaw * LEVEL_STRIDE, MAX_AGAW_WIDTH); |
| } |
| |
| static inline int width_to_agaw(int width) |
| { |
| return DIV_ROUND_UP(width - 30, LEVEL_STRIDE); |
| } |
| |
| static inline unsigned int level_to_offset_bits(int level) |
| { |
| return (level - 1) * LEVEL_STRIDE; |
| } |
| |
| static inline int pfn_level_offset(unsigned long pfn, int level) |
| { |
| return (pfn >> level_to_offset_bits(level)) & LEVEL_MASK; |
| } |
| |
| static inline unsigned long level_mask(int level) |
| { |
| return -1UL << level_to_offset_bits(level); |
| } |
| |
| static inline unsigned long level_size(int level) |
| { |
| return 1UL << level_to_offset_bits(level); |
| } |
| |
| static inline unsigned long align_to_level(unsigned long pfn, int level) |
| { |
| return (pfn + level_size(level) - 1) & level_mask(level); |
| } |
| |
| static inline unsigned long lvl_to_nr_pages(unsigned int lvl) |
| { |
| return 1 << min_t(int, (lvl - 1) * LEVEL_STRIDE, MAX_AGAW_PFN_WIDTH); |
| } |
| |
| /* VT-d pages must always be _smaller_ than MM pages. Otherwise things |
| are never going to work. */ |
| static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn) |
| { |
| return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT); |
| } |
| |
| static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn) |
| { |
| return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT); |
| } |
| static inline unsigned long page_to_dma_pfn(struct page *pg) |
| { |
| return mm_to_dma_pfn(page_to_pfn(pg)); |
| } |
| static inline unsigned long virt_to_dma_pfn(void *p) |
| { |
| return page_to_dma_pfn(virt_to_page(p)); |
| } |
| |
| /* global iommu list, set NULL for ignored DMAR units */ |
| static struct intel_iommu **g_iommus; |
| |
| static void __init check_tylersburg_isoch(void); |
| static int rwbf_quirk; |
| |
| /* |
| * set to 1 to panic kernel if can't successfully enable VT-d |
| * (used when kernel is launched w/ TXT) |
| */ |
| static int force_on = 0; |
| int intel_iommu_tboot_noforce; |
| |
| /* |
| * 0: Present |
| * 1-11: Reserved |
| * 12-63: Context Ptr (12 - (haw-1)) |
| * 64-127: Reserved |
| */ |
| struct root_entry { |
| u64 lo; |
| u64 hi; |
| }; |
| #define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry)) |
| |
| /* |
| * Take a root_entry and return the Lower Context Table Pointer (LCTP) |
| * if marked present. |
| */ |
| static phys_addr_t root_entry_lctp(struct root_entry *re) |
| { |
| if (!(re->lo & 1)) |
| return 0; |
| |
| return re->lo & VTD_PAGE_MASK; |
| } |
| |
| /* |
| * Take a root_entry and return the Upper Context Table Pointer (UCTP) |
| * if marked present. |
| */ |
| static phys_addr_t root_entry_uctp(struct root_entry *re) |
| { |
| if (!(re->hi & 1)) |
| return 0; |
| |
| return re->hi & VTD_PAGE_MASK; |
| } |
| /* |
| * low 64 bits: |
| * 0: present |
| * 1: fault processing disable |
| * 2-3: translation type |
| * 12-63: address space root |
| * high 64 bits: |
| * 0-2: address width |
| * 3-6: aval |
| * 8-23: domain id |
| */ |
| struct context_entry { |
| u64 lo; |
| u64 hi; |
| }; |
| |
| static inline void context_clear_pasid_enable(struct context_entry *context) |
| { |
| context->lo &= ~(1ULL << 11); |
| } |
| |
| static inline bool context_pasid_enabled(struct context_entry *context) |
| { |
| return !!(context->lo & (1ULL << 11)); |
| } |
| |
| static inline void context_set_copied(struct context_entry *context) |
| { |
| context->hi |= (1ull << 3); |
| } |
| |
| static inline bool context_copied(struct context_entry *context) |
| { |
| return !!(context->hi & (1ULL << 3)); |
| } |
| |
| static inline bool __context_present(struct context_entry *context) |
| { |
| return (context->lo & 1); |
| } |
| |
| static inline bool context_present(struct context_entry *context) |
| { |
| return context_pasid_enabled(context) ? |
| __context_present(context) : |
| __context_present(context) && !context_copied(context); |
| } |
| |
| static inline void context_set_present(struct context_entry *context) |
| { |
| context->lo |= 1; |
| } |
| |
| static inline void context_set_fault_enable(struct context_entry *context) |
| { |
| context->lo &= (((u64)-1) << 2) | 1; |
| } |
| |
| static inline void context_set_translation_type(struct context_entry *context, |
| unsigned long value) |
| { |
| context->lo &= (((u64)-1) << 4) | 3; |
| context->lo |= (value & 3) << 2; |
| } |
| |
| static inline void context_set_address_root(struct context_entry *context, |
| unsigned long value) |
| { |
| context->lo &= ~VTD_PAGE_MASK; |
| context->lo |= value & VTD_PAGE_MASK; |
| } |
| |
| static inline void context_set_address_width(struct context_entry *context, |
| unsigned long value) |
| { |
| context->hi |= value & 7; |
| } |
| |
| static inline void context_set_domain_id(struct context_entry *context, |
| unsigned long value) |
| { |
| context->hi |= (value & ((1 << 16) - 1)) << 8; |
| } |
| |
| static inline int context_domain_id(struct context_entry *c) |
| { |
| return((c->hi >> 8) & 0xffff); |
| } |
| |
| static inline void context_clear_entry(struct context_entry *context) |
| { |
| context->lo = 0; |
| context->hi = 0; |
| } |
| |
| /* |
| * 0: readable |
| * 1: writable |
| * 2-6: reserved |
| * 7: super page |
| * 8-10: available |
| * 11: snoop behavior |
| * 12-63: Host physcial address |
| */ |
| struct dma_pte { |
| u64 val; |
| }; |
| |
| static inline void dma_clear_pte(struct dma_pte *pte) |
| { |
| pte->val = 0; |
| } |
| |
| static inline u64 dma_pte_addr(struct dma_pte *pte) |
| { |
| #ifdef CONFIG_64BIT |
| return pte->val & VTD_PAGE_MASK; |
| #else |
| /* Must have a full atomic 64-bit read */ |
| return __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK; |
| #endif |
| } |
| |
| static inline bool dma_pte_present(struct dma_pte *pte) |
| { |
| return (pte->val & 3) != 0; |
| } |
| |
| static inline bool dma_pte_superpage(struct dma_pte *pte) |
| { |
| return (pte->val & DMA_PTE_LARGE_PAGE); |
| } |
| |
| static inline int first_pte_in_page(struct dma_pte *pte) |
| { |
| return !((unsigned long)pte & ~VTD_PAGE_MASK); |
| } |
| |
| /* |
| * This domain is a statically identity mapping domain. |
| * 1. This domain creats a static 1:1 mapping to all usable memory. |
| * 2. It maps to each iommu if successful. |
| * 3. Each iommu mapps to this domain if successful. |
| */ |
| static struct dmar_domain *si_domain; |
| static int hw_pass_through = 1; |
| |
| /* |
| * Domain represents a virtual machine, more than one devices |
| * across iommus may be owned in one domain, e.g. kvm guest. |
| */ |
| #define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 0) |
| |
| /* si_domain contains mulitple devices */ |
| #define DOMAIN_FLAG_STATIC_IDENTITY (1 << 1) |
| |
| #define for_each_domain_iommu(idx, domain) \ |
| for (idx = 0; idx < g_num_of_iommus; idx++) \ |
| if (domain->iommu_refcnt[idx]) |
| |
| struct dmar_domain { |
| int nid; /* node id */ |
| |
| unsigned iommu_refcnt[DMAR_UNITS_SUPPORTED]; |
| /* Refcount of devices per iommu */ |
| |
| |
| u16 iommu_did[DMAR_UNITS_SUPPORTED]; |
| /* Domain ids per IOMMU. Use u16 since |
| * domain ids are 16 bit wide according |
| * to VT-d spec, section 9.3 */ |
| |
| bool has_iotlb_device; |
| struct list_head devices; /* all devices' list */ |
| struct iova_domain iovad; /* iova's that belong to this domain */ |
| |
| struct dma_pte *pgd; /* virtual address */ |
| int gaw; /* max guest address width */ |
| |
| /* adjusted guest address width, 0 is level 2 30-bit */ |
| int agaw; |
| |
| int flags; /* flags to find out type of domain */ |
| |
| int iommu_coherency;/* indicate coherency of iommu access */ |
| int iommu_snooping; /* indicate snooping control feature*/ |
| int iommu_count; /* reference count of iommu */ |
| int iommu_superpage;/* Level of superpages supported: |
| 0 == 4KiB (no superpages), 1 == 2MiB, |
| 2 == 1GiB, 3 == 512GiB, 4 == 1TiB */ |
| u64 max_addr; /* maximum mapped address */ |
| |
| struct iommu_domain domain; /* generic domain data structure for |
| iommu core */ |
| }; |
| |
| /* PCI domain-device relationship */ |
| struct device_domain_info { |
| struct list_head link; /* link to domain siblings */ |
| struct list_head global; /* link to global list */ |
| u8 bus; /* PCI bus number */ |
| u8 devfn; /* PCI devfn number */ |
| u8 pasid_supported:3; |
| u8 pasid_enabled:1; |
| u8 pri_supported:1; |
| u8 pri_enabled:1; |
| u8 ats_supported:1; |
| u8 ats_enabled:1; |
| u8 ats_qdep; |
| struct device *dev; /* it's NULL for PCIe-to-PCI bridge */ |
| struct intel_iommu *iommu; /* IOMMU used by this device */ |
| struct dmar_domain *domain; /* pointer to domain */ |
| }; |
| |
| struct dmar_rmrr_unit { |
| struct list_head list; /* list of rmrr units */ |
| struct acpi_dmar_header *hdr; /* ACPI header */ |
| u64 base_address; /* reserved base address*/ |
| u64 end_address; /* reserved end address */ |
| struct dmar_dev_scope *devices; /* target devices */ |
| int devices_cnt; /* target device count */ |
| struct iommu_resv_region *resv; /* reserved region handle */ |
| }; |
| |
| struct dmar_atsr_unit { |
| struct list_head list; /* list of ATSR units */ |
| struct acpi_dmar_header *hdr; /* ACPI header */ |
| struct dmar_dev_scope *devices; /* target devices */ |
| int devices_cnt; /* target device count */ |
| u8 include_all:1; /* include all ports */ |
| }; |
| |
| static LIST_HEAD(dmar_atsr_units); |
| static LIST_HEAD(dmar_rmrr_units); |
| |
| #define for_each_rmrr_units(rmrr) \ |
| list_for_each_entry(rmrr, &dmar_rmrr_units, list) |
| |
| static void flush_unmaps_timeout(unsigned long data); |
| |
| struct deferred_flush_entry { |
| unsigned long iova_pfn; |
| unsigned long nrpages; |
| struct dmar_domain *domain; |
| struct page *freelist; |
| }; |
| |
| #define HIGH_WATER_MARK 250 |
| struct deferred_flush_table { |
| int next; |
| struct deferred_flush_entry entries[HIGH_WATER_MARK]; |
| }; |
| |
| struct deferred_flush_data { |
| spinlock_t lock; |
| int timer_on; |
| struct timer_list timer; |
| long size; |
| struct deferred_flush_table *tables; |
| }; |
| |
| DEFINE_PER_CPU(struct deferred_flush_data, deferred_flush); |
| |
| /* bitmap for indexing intel_iommus */ |
| static int g_num_of_iommus; |
| |
| static void domain_exit(struct dmar_domain *domain); |
| static void domain_remove_dev_info(struct dmar_domain *domain); |
| static void dmar_remove_one_dev_info(struct dmar_domain *domain, |
| struct device *dev); |
| static void __dmar_remove_one_dev_info(struct device_domain_info *info); |
| static void domain_context_clear(struct intel_iommu *iommu, |
| struct device *dev); |
| static int domain_detach_iommu(struct dmar_domain *domain, |
| struct intel_iommu *iommu); |
| |
| #ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON |
| int dmar_disabled = 0; |
| #else |
| int dmar_disabled = 1; |
| #endif /*CONFIG_INTEL_IOMMU_DEFAULT_ON*/ |
| |
| int intel_iommu_enabled = 0; |
| EXPORT_SYMBOL_GPL(intel_iommu_enabled); |
| |
| static int dmar_map_gfx = 1; |
| static int dmar_forcedac; |
| static int intel_iommu_strict; |
| static int intel_iommu_superpage = 1; |
| static int intel_iommu_ecs = 1; |
| static int intel_iommu_pasid28; |
| static int iommu_identity_mapping; |
| |
| #define IDENTMAP_ALL 1 |
| #define IDENTMAP_GFX 2 |
| #define IDENTMAP_AZALIA 4 |
| |
| /* Broadwell and Skylake have broken ECS support — normal so-called "second |
| * level" translation of DMA requests-without-PASID doesn't actually happen |
| * unless you also set the NESTE bit in an extended context-entry. Which of |
| * course means that SVM doesn't work because it's trying to do nested |
| * translation of the physical addresses it finds in the process page tables, |
| * through the IOVA->phys mapping found in the "second level" page tables. |
| * |
| * The VT-d specification was retroactively changed to change the definition |
| * of the capability bits and pretend that Broadwell/Skylake never happened... |
| * but unfortunately the wrong bit was changed. It's ECS which is broken, but |
| * for some reason it was the PASID capability bit which was redefined (from |
| * bit 28 on BDW/SKL to bit 40 in future). |
| * |
| * So our test for ECS needs to eschew those implementations which set the old |
| * PASID capabiity bit 28, since those are the ones on which ECS is broken. |
| * Unless we are working around the 'pasid28' limitations, that is, by putting |
| * the device into passthrough mode for normal DMA and thus masking the bug. |
| */ |
| #define ecs_enabled(iommu) (intel_iommu_ecs && ecap_ecs(iommu->ecap) && \ |
| (intel_iommu_pasid28 || !ecap_broken_pasid(iommu->ecap))) |
| /* PASID support is thus enabled if ECS is enabled and *either* of the old |
| * or new capability bits are set. */ |
| #define pasid_enabled(iommu) (ecs_enabled(iommu) && \ |
| (ecap_pasid(iommu->ecap) || ecap_broken_pasid(iommu->ecap))) |
| |
| int intel_iommu_gfx_mapped; |
| EXPORT_SYMBOL_GPL(intel_iommu_gfx_mapped); |
| |
| #define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1)) |
| static DEFINE_SPINLOCK(device_domain_lock); |
| static LIST_HEAD(device_domain_list); |
| |
| const struct iommu_ops intel_iommu_ops; |
| |
| static bool translation_pre_enabled(struct intel_iommu *iommu) |
| { |
| return (iommu->flags & VTD_FLAG_TRANS_PRE_ENABLED); |
| } |
| |
| static void clear_translation_pre_enabled(struct intel_iommu *iommu) |
| { |
| iommu->flags &= ~VTD_FLAG_TRANS_PRE_ENABLED; |
| } |
| |
| static void init_translation_status(struct intel_iommu *iommu) |
| { |
| u32 gsts; |
| |
| gsts = readl(iommu->reg + DMAR_GSTS_REG); |
| if (gsts & DMA_GSTS_TES) |
| iommu->flags |= VTD_FLAG_TRANS_PRE_ENABLED; |
| } |
| |
| /* Convert generic 'struct iommu_domain to private struct dmar_domain */ |
| static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom) |
| { |
| return container_of(dom, struct dmar_domain, domain); |
| } |
| |
| static int __init intel_iommu_setup(char *str) |
| { |
| if (!str) |
| return -EINVAL; |
| while (*str) { |
| if (!strncmp(str, "on", 2)) { |
| dmar_disabled = 0; |
| pr_info("IOMMU enabled\n"); |
| } else if (!strncmp(str, "off", 3)) { |
| dmar_disabled = 1; |
| pr_info("IOMMU disabled\n"); |
| } else if (!strncmp(str, "igfx_off", 8)) { |
| dmar_map_gfx = 0; |
| pr_info("Disable GFX device mapping\n"); |
| } else if (!strncmp(str, "forcedac", 8)) { |
| pr_info("Forcing DAC for PCI devices\n"); |
| dmar_forcedac = 1; |
| } else if (!strncmp(str, "strict", 6)) { |
| pr_info("Disable batched IOTLB flush\n"); |
| intel_iommu_strict = 1; |
| } else if (!strncmp(str, "sp_off", 6)) { |
| pr_info("Disable supported super page\n"); |
| intel_iommu_superpage = 0; |
| } else if (!strncmp(str, "ecs_off", 7)) { |
| printk(KERN_INFO |
| "Intel-IOMMU: disable extended context table support\n"); |
| intel_iommu_ecs = 0; |
| } else if (!strncmp(str, "pasid28", 7)) { |
| printk(KERN_INFO |
| "Intel-IOMMU: enable pre-production PASID support\n"); |
| intel_iommu_pasid28 = 1; |
| iommu_identity_mapping |= IDENTMAP_GFX; |
| } else if (!strncmp(str, "tboot_noforce", 13)) { |
| printk(KERN_INFO |
| "Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n"); |
| intel_iommu_tboot_noforce = 1; |
| } |
| |
| str += strcspn(str, ","); |
| while (*str == ',') |
| str++; |
| } |
| return 0; |
| } |
| __setup("intel_iommu=", intel_iommu_setup); |
| |
| static struct kmem_cache *iommu_domain_cache; |
| static struct kmem_cache *iommu_devinfo_cache; |
| |
| static struct dmar_domain* get_iommu_domain(struct intel_iommu *iommu, u16 did) |
| { |
| struct dmar_domain **domains; |
| int idx = did >> 8; |
| |
| domains = iommu->domains[idx]; |
| if (!domains) |
| return NULL; |
| |
| return domains[did & 0xff]; |
| } |
| |
| static void set_iommu_domain(struct intel_iommu *iommu, u16 did, |
| struct dmar_domain *domain) |
| { |
| struct dmar_domain **domains; |
| int idx = did >> 8; |
| |
| if (!iommu->domains[idx]) { |
| size_t size = 256 * sizeof(struct dmar_domain *); |
| iommu->domains[idx] = kzalloc(size, GFP_ATOMIC); |
| } |
| |
| domains = iommu->domains[idx]; |
| if (WARN_ON(!domains)) |
| return; |
| else |
| domains[did & 0xff] = domain; |
| } |
| |
| static inline void *alloc_pgtable_page(int node) |
| { |
| struct page *page; |
| void *vaddr = NULL; |
| |
| page = alloc_pages_node(node, GFP_ATOMIC | __GFP_ZERO, 0); |
| if (page) |
| vaddr = page_address(page); |
| return vaddr; |
| } |
| |
| static inline void free_pgtable_page(void *vaddr) |
| { |
| free_page((unsigned long)vaddr); |
| } |
| |
| static inline void *alloc_domain_mem(void) |
| { |
| return kmem_cache_alloc(iommu_domain_cache, GFP_ATOMIC); |
| } |
| |
| static void free_domain_mem(void *vaddr) |
| { |
| kmem_cache_free(iommu_domain_cache, vaddr); |
| } |
| |
| static inline void * alloc_devinfo_mem(void) |
| { |
| return kmem_cache_alloc(iommu_devinfo_cache, GFP_ATOMIC); |
| } |
| |
| static inline void free_devinfo_mem(void *vaddr) |
| { |
| kmem_cache_free(iommu_devinfo_cache, vaddr); |
| } |
| |
| static inline int domain_type_is_vm(struct dmar_domain *domain) |
| { |
| return domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE; |
| } |
| |
| static inline int domain_type_is_si(struct dmar_domain *domain) |
| { |
| return domain->flags & DOMAIN_FLAG_STATIC_IDENTITY; |
| } |
| |
| static inline int domain_type_is_vm_or_si(struct dmar_domain *domain) |
| { |
| return domain->flags & (DOMAIN_FLAG_VIRTUAL_MACHINE | |
| DOMAIN_FLAG_STATIC_IDENTITY); |
| } |
| |
| static inline int domain_pfn_supported(struct dmar_domain *domain, |
| unsigned long pfn) |
| { |
| int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; |
| |
| return !(addr_width < BITS_PER_LONG && pfn >> addr_width); |
| } |
| |
| static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw) |
| { |
| unsigned long sagaw; |
| int agaw = -1; |
| |
| sagaw = cap_sagaw(iommu->cap); |
| for (agaw = width_to_agaw(max_gaw); |
| agaw >= 0; agaw--) { |
| if (test_bit(agaw, &sagaw)) |
| break; |
| } |
| |
| return agaw; |
| } |
| |
| /* |
| * Calculate max SAGAW for each iommu. |
| */ |
| int iommu_calculate_max_sagaw(struct intel_iommu *iommu) |
| { |
| return __iommu_calculate_agaw(iommu, MAX_AGAW_WIDTH); |
| } |
| |
| /* |
| * calculate agaw for each iommu. |
| * "SAGAW" may be different across iommus, use a default agaw, and |
| * get a supported less agaw for iommus that don't support the default agaw. |
| */ |
| int iommu_calculate_agaw(struct intel_iommu *iommu) |
| { |
| return __iommu_calculate_agaw(iommu, DEFAULT_DOMAIN_ADDRESS_WIDTH); |
| } |
| |
| /* This functionin only returns single iommu in a domain */ |
| static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain) |
| { |
| int iommu_id; |
| |
| /* si_domain and vm domain should not get here. */ |
| BUG_ON(domain_type_is_vm_or_si(domain)); |
| for_each_domain_iommu(iommu_id, domain) |
| break; |
| |
| if (iommu_id < 0 || iommu_id >= g_num_of_iommus) |
| return NULL; |
| |
| return g_iommus[iommu_id]; |
| } |
| |
| static void domain_update_iommu_coherency(struct dmar_domain *domain) |
| { |
| struct dmar_drhd_unit *drhd; |
| struct intel_iommu *iommu; |
| bool found = false; |
| int i; |
| |
| domain->iommu_coherency = 1; |
| |
| for_each_domain_iommu(i, domain) { |
| found = true; |
| if (!ecap_coherent(g_iommus[i]->ecap)) { |
| domain->iommu_coherency = 0; |
| break; |
| } |
| } |
| if (found) |
| return; |
| |
| /* No hardware attached; use lowest common denominator */ |
| rcu_read_lock(); |
| for_each_active_iommu(iommu, drhd) { |
| if (!ecap_coherent(iommu->ecap)) { |
| domain->iommu_coherency = 0; |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| } |
| |
| static int domain_update_iommu_snooping(struct intel_iommu *skip) |
| { |
| struct dmar_drhd_unit *drhd; |
| struct intel_iommu *iommu; |
| int ret = 1; |
| |
| rcu_read_lock(); |
| for_each_active_iommu(iommu, drhd) { |
| if (iommu != skip) { |
| if (!ecap_sc_support(iommu->ecap)) { |
| ret = 0; |
| break; |
| } |
| } |
| } |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| |
| static int domain_update_iommu_superpage(struct intel_iommu *skip) |
| { |
| struct dmar_drhd_unit *drhd; |
| struct intel_iommu *iommu; |
| int mask = 0xf; |
| |
| if (!intel_iommu_superpage) { |
| return 0; |
| } |
| |
| /* set iommu_superpage to the smallest common denominator */ |
| rcu_read_lock(); |
| for_each_active_iommu(iommu, drhd) { |
| if (iommu != skip) { |
| mask &= cap_super_page_val(iommu->cap); |
| if (!mask) |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| |
| return fls(mask); |
| } |
| |
| /* Some capabilities may be different across iommus */ |
| static void domain_update_iommu_cap(struct dmar_domain *domain) |
| { |
| domain_update_iommu_coherency(domain); |
| domain->iommu_snooping = domain_update_iommu_snooping(NULL); |
| domain->iommu_superpage = domain_update_iommu_superpage(NULL); |
| } |
| |
| static inline struct context_entry *iommu_context_addr(struct intel_iommu *iommu, |
| u8 bus, u8 devfn, int alloc) |
| { |
| struct root_entry *root = &iommu->root_entry[bus]; |
| struct context_entry *context; |
| u64 *entry; |
| |
| entry = &root->lo; |
| if (ecs_enabled(iommu)) { |
| if (devfn >= 0x80) { |
| devfn -= 0x80; |
| entry = &root->hi; |
| } |
| devfn *= 2; |
| } |
| if (*entry & 1) |
| context = phys_to_virt(*entry & VTD_PAGE_MASK); |
| else { |
| unsigned long phy_addr; |
| if (!alloc) |
| return NULL; |
| |
| context = alloc_pgtable_page(iommu->node); |
| if (!context) |
| return NULL; |
| |
| __iommu_flush_cache(iommu, (void *)context, CONTEXT_SIZE); |
| phy_addr = virt_to_phys((void *)context); |
| *entry = phy_addr | 1; |
| __iommu_flush_cache(iommu, entry, sizeof(*entry)); |
| } |
| return &context[devfn]; |
| } |
| |
| static int iommu_dummy(struct device *dev) |
| { |
| return dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO; |
| } |
| |
| static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn) |
| { |
| struct dmar_drhd_unit *drhd = NULL; |
| struct intel_iommu *iommu; |
| struct device *tmp; |
| struct pci_dev *ptmp, *pdev = NULL; |
| u16 segment = 0; |
| int i; |
| |
| if (iommu_dummy(dev)) |
| return NULL; |
| |
| if (dev_is_pci(dev)) { |
| struct pci_dev *pf_pdev; |
| |
| pdev = to_pci_dev(dev); |
| /* VFs aren't listed in scope tables; we need to look up |
| * the PF instead to find the IOMMU. */ |
| pf_pdev = pci_physfn(pdev); |
| dev = &pf_pdev->dev; |
| segment = pci_domain_nr(pdev->bus); |
| } else if (has_acpi_companion(dev)) |
| dev = &ACPI_COMPANION(dev)->dev; |
| |
| rcu_read_lock(); |
| for_each_active_iommu(iommu, drhd) { |
| if (pdev && segment != drhd->segment) |
| continue; |
| |
| for_each_active_dev_scope(drhd->devices, |
| drhd->devices_cnt, i, tmp) { |
| if (tmp == dev) { |
| /* For a VF use its original BDF# not that of the PF |
| * which we used for the IOMMU lookup. Strictly speaking |
| * we could do this for all PCI devices; we only need to |
| * get the BDF# from the scope table for ACPI matches. */ |
| if (pdev && pdev->is_virtfn) |
| goto got_pdev; |
| |
| *bus = drhd->devices[i].bus; |
| *devfn = drhd->devices[i].devfn; |
| goto out; |
| } |
| |
| if (!pdev || !dev_is_pci(tmp)) |
| continue; |
| |
| ptmp = to_pci_dev(tmp); |
| if (ptmp->subordinate && |
| ptmp->subordinate->number <= pdev->bus->number && |
| ptmp->subordinate->busn_res.end >= pdev->bus->number) |
| goto got_pdev; |
| } |
| |
| if (pdev && drhd->include_all) { |
| got_pdev: |
| *bus = pdev->bus->number; |
| *devfn = pdev->devfn; |
| goto out; |
| } |
| } |
| iommu = NULL; |
| out: |
| rcu_read_unlock(); |
| |
| return iommu; |
| } |
| |
| static void domain_flush_cache(struct dmar_domain *domain, |
| void *addr, int size) |
| { |
| if (!domain->iommu_coherency) |
| clflush_cache_range(addr, size); |
| } |
| |
| static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn) |
| { |
| struct context_entry *context; |
| int ret = 0; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| context = iommu_context_addr(iommu, bus, devfn, 0); |
| if (context) |
| ret = context_present(context); |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| return ret; |
| } |
| |
| static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn) |
| { |
| struct context_entry *context; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| context = iommu_context_addr(iommu, bus, devfn, 0); |
| if (context) { |
| context_clear_entry(context); |
| __iommu_flush_cache(iommu, context, sizeof(*context)); |
| } |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| } |
| |
| static void free_context_table(struct intel_iommu *iommu) |
| { |
| int i; |
| unsigned long flags; |
| struct context_entry *context; |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| if (!iommu->root_entry) { |
| goto out; |
| } |
| for (i = 0; i < ROOT_ENTRY_NR; i++) { |
| context = iommu_context_addr(iommu, i, 0, 0); |
| if (context) |
| free_pgtable_page(context); |
| |
| if (!ecs_enabled(iommu)) |
| continue; |
| |
| context = iommu_context_addr(iommu, i, 0x80, 0); |
| if (context) |
| free_pgtable_page(context); |
| |
| } |
| free_pgtable_page(iommu->root_entry); |
| iommu->root_entry = NULL; |
| out: |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| } |
| |
| static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain, |
| unsigned long pfn, int *target_level) |
| { |
| struct dma_pte *parent, *pte = NULL; |
| int level = agaw_to_level(domain->agaw); |
| int offset; |
| |
| BUG_ON(!domain->pgd); |
| |
| if (!domain_pfn_supported(domain, pfn)) |
| /* Address beyond IOMMU's addressing capabilities. */ |
| return NULL; |
| |
| parent = domain->pgd; |
| |
| while (1) { |
| void *tmp_page; |
| |
| offset = pfn_level_offset(pfn, level); |
| pte = &parent[offset]; |
| if (!*target_level && (dma_pte_superpage(pte) || !dma_pte_present(pte))) |
| break; |
| if (level == *target_level) |
| break; |
| |
| if (!dma_pte_present(pte)) { |
| uint64_t pteval; |
| |
| tmp_page = alloc_pgtable_page(domain->nid); |
| |
| if (!tmp_page) |
| return NULL; |
| |
| domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE); |
| pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE; |
| if (cmpxchg64(&pte->val, 0ULL, pteval)) |
| /* Someone else set it while we were thinking; use theirs. */ |
| free_pgtable_page(tmp_page); |
| else |
| domain_flush_cache(domain, pte, sizeof(*pte)); |
| } |
| if (level == 1) |
| break; |
| |
| parent = phys_to_virt(dma_pte_addr(pte)); |
| level--; |
| } |
| |
| if (!*target_level) |
| *target_level = level; |
| |
| return pte; |
| } |
| |
| |
| /* return address's pte at specific level */ |
| static struct dma_pte *dma_pfn_level_pte(struct dmar_domain *domain, |
| unsigned long pfn, |
| int level, int *large_page) |
| { |
| struct dma_pte *parent, *pte = NULL; |
| int total = agaw_to_level(domain->agaw); |
| int offset; |
| |
| parent = domain->pgd; |
| while (level <= total) { |
| offset = pfn_level_offset(pfn, total); |
| pte = &parent[offset]; |
| if (level == total) |
| return pte; |
| |
| if (!dma_pte_present(pte)) { |
| *large_page = total; |
| break; |
| } |
| |
| if (dma_pte_superpage(pte)) { |
| *large_page = total; |
| return pte; |
| } |
| |
| parent = phys_to_virt(dma_pte_addr(pte)); |
| total--; |
| } |
| return NULL; |
| } |
| |
| /* clear last level pte, a tlb flush should be followed */ |
| static void dma_pte_clear_range(struct dmar_domain *domain, |
| unsigned long start_pfn, |
| unsigned long last_pfn) |
| { |
| unsigned int large_page = 1; |
| struct dma_pte *first_pte, *pte; |
| |
| BUG_ON(!domain_pfn_supported(domain, start_pfn)); |
| BUG_ON(!domain_pfn_supported(domain, last_pfn)); |
| BUG_ON(start_pfn > last_pfn); |
| |
| /* we don't need lock here; nobody else touches the iova range */ |
| do { |
| large_page = 1; |
| first_pte = pte = dma_pfn_level_pte(domain, start_pfn, 1, &large_page); |
| if (!pte) { |
| start_pfn = align_to_level(start_pfn + 1, large_page + 1); |
| continue; |
| } |
| do { |
| dma_clear_pte(pte); |
| start_pfn += lvl_to_nr_pages(large_page); |
| pte++; |
| } while (start_pfn <= last_pfn && !first_pte_in_page(pte)); |
| |
| domain_flush_cache(domain, first_pte, |
| (void *)pte - (void *)first_pte); |
| |
| } while (start_pfn && start_pfn <= last_pfn); |
| } |
| |
| static void dma_pte_free_level(struct dmar_domain *domain, int level, |
| struct dma_pte *pte, unsigned long pfn, |
| unsigned long start_pfn, unsigned long last_pfn) |
| { |
| pfn = max(start_pfn, pfn); |
| pte = &pte[pfn_level_offset(pfn, level)]; |
| |
| do { |
| unsigned long level_pfn; |
| struct dma_pte *level_pte; |
| |
| if (!dma_pte_present(pte) || dma_pte_superpage(pte)) |
| goto next; |
| |
| level_pfn = pfn & level_mask(level); |
| level_pte = phys_to_virt(dma_pte_addr(pte)); |
| |
| if (level > 2) |
| dma_pte_free_level(domain, level - 1, level_pte, |
| level_pfn, start_pfn, last_pfn); |
| |
| /* If range covers entire pagetable, free it */ |
| if (!(start_pfn > level_pfn || |
| last_pfn < level_pfn + level_size(level) - 1)) { |
| dma_clear_pte(pte); |
| domain_flush_cache(domain, pte, sizeof(*pte)); |
| free_pgtable_page(level_pte); |
| } |
| next: |
| pfn += level_size(level); |
| } while (!first_pte_in_page(++pte) && pfn <= last_pfn); |
| } |
| |
| /* clear last level (leaf) ptes and free page table pages. */ |
| static void dma_pte_free_pagetable(struct dmar_domain *domain, |
| unsigned long start_pfn, |
| unsigned long last_pfn) |
| { |
| BUG_ON(!domain_pfn_supported(domain, start_pfn)); |
| BUG_ON(!domain_pfn_supported(domain, last_pfn)); |
| BUG_ON(start_pfn > last_pfn); |
| |
| dma_pte_clear_range(domain, start_pfn, last_pfn); |
| |
| /* We don't need lock here; nobody else touches the iova range */ |
| dma_pte_free_level(domain, agaw_to_level(domain->agaw), |
| domain->pgd, 0, start_pfn, last_pfn); |
| |
| /* free pgd */ |
| if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) { |
| free_pgtable_page(domain->pgd); |
| domain->pgd = NULL; |
| } |
| } |
| |
| /* When a page at a given level is being unlinked from its parent, we don't |
| need to *modify* it at all. All we need to do is make a list of all the |
| pages which can be freed just as soon as we've flushed the IOTLB and we |
| know the hardware page-walk will no longer touch them. |
| The 'pte' argument is the *parent* PTE, pointing to the page that is to |
| be freed. */ |
| static struct page *dma_pte_list_pagetables(struct dmar_domain *domain, |
| int level, struct dma_pte *pte, |
| struct page *freelist) |
| { |
| struct page *pg; |
| |
| pg = pfn_to_page(dma_pte_addr(pte) >> PAGE_SHIFT); |
| pg->freelist = freelist; |
| freelist = pg; |
| |
| if (level == 1) |
| return freelist; |
| |
| pte = page_address(pg); |
| do { |
| if (dma_pte_present(pte) && !dma_pte_superpage(pte)) |
| freelist = dma_pte_list_pagetables(domain, level - 1, |
| pte, freelist); |
| pte++; |
| } while (!first_pte_in_page(pte)); |
| |
| return freelist; |
| } |
| |
| static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level, |
| struct dma_pte *pte, unsigned long pfn, |
| unsigned long start_pfn, |
| unsigned long last_pfn, |
| struct page *freelist) |
| { |
| struct dma_pte *first_pte = NULL, *last_pte = NULL; |
| |
| pfn = max(start_pfn, pfn); |
| pte = &pte[pfn_level_offset(pfn, level)]; |
| |
| do { |
| unsigned long level_pfn; |
| |
| if (!dma_pte_present(pte)) |
| goto next; |
| |
| level_pfn = pfn & level_mask(level); |
| |
| /* If range covers entire pagetable, free it */ |
| if (start_pfn <= level_pfn && |
| last_pfn >= level_pfn + level_size(level) - 1) { |
| /* These suborbinate page tables are going away entirely. Don't |
| bother to clear them; we're just going to *free* them. */ |
| if (level > 1 && !dma_pte_superpage(pte)) |
| freelist = dma_pte_list_pagetables(domain, level - 1, pte, freelist); |
| |
| dma_clear_pte(pte); |
| if (!first_pte) |
| first_pte = pte; |
| last_pte = pte; |
| } else if (level > 1) { |
| /* Recurse down into a level that isn't *entirely* obsolete */ |
| freelist = dma_pte_clear_level(domain, level - 1, |
| phys_to_virt(dma_pte_addr(pte)), |
| level_pfn, start_pfn, last_pfn, |
| freelist); |
| } |
| next: |
| pfn += level_size(level); |
| } while (!first_pte_in_page(++pte) && pfn <= last_pfn); |
| |
| if (first_pte) |
| domain_flush_cache(domain, first_pte, |
| (void *)++last_pte - (void *)first_pte); |
| |
| return freelist; |
| } |
| |
| /* We can't just free the pages because the IOMMU may still be walking |
| the page tables, and may have cached the intermediate levels. The |
| pages can only be freed after the IOTLB flush has been done. */ |
| static struct page *domain_unmap(struct dmar_domain *domain, |
| unsigned long start_pfn, |
| unsigned long last_pfn) |
| { |
| struct page *freelist = NULL; |
| |
| BUG_ON(!domain_pfn_supported(domain, start_pfn)); |
| BUG_ON(!domain_pfn_supported(domain, last_pfn)); |
| BUG_ON(start_pfn > last_pfn); |
| |
| /* we don't need lock here; nobody else touches the iova range */ |
| freelist = dma_pte_clear_level(domain, agaw_to_level(domain->agaw), |
| domain->pgd, 0, start_pfn, last_pfn, NULL); |
| |
| /* free pgd */ |
| if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) { |
| struct page *pgd_page = virt_to_page(domain->pgd); |
| pgd_page->freelist = freelist; |
| freelist = pgd_page; |
| |
| domain->pgd = NULL; |
| } |
| |
| return freelist; |
| } |
| |
| static void dma_free_pagelist(struct page *freelist) |
| { |
| struct page *pg; |
| |
| while ((pg = freelist)) { |
| freelist = pg->freelist; |
| free_pgtable_page(page_address(pg)); |
| } |
| } |
| |
| /* iommu handling */ |
| static int iommu_alloc_root_entry(struct intel_iommu *iommu) |
| { |
| struct root_entry *root; |
| unsigned long flags; |
| |
| root = (struct root_entry *)alloc_pgtable_page(iommu->node); |
| if (!root) { |
| pr_err("Allocating root entry for %s failed\n", |
| iommu->name); |
| return -ENOMEM; |
| } |
| |
| __iommu_flush_cache(iommu, root, ROOT_SIZE); |
| |
| spin_lock_irqsave(&iommu->lock, flags); |
| iommu->root_entry = root; |
| spin_unlock_irqrestore(&iommu->lock, flags); |
| |
| return 0; |
| } |
| |
| static void iommu_set_root_entry(struct intel_iommu *iommu) |
| { |
| u64 addr; |
| u32 sts; |
| unsigned long flag; |
| |
| addr = virt_to_phys(iommu->root_entry); |
| if (ecs_enabled(iommu)) |
| addr |= DMA_RTADDR_RTT; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flag); |
| dmar_writeq(iommu->reg + DMAR_RTADDR_REG, addr); |
| |
| writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG); |
| |
| /* Make sure hardware complete it */ |
| IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, |
| readl, (sts & DMA_GSTS_RTPS), sts); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
| } |
| |
| static void iommu_flush_write_buffer(struct intel_iommu *iommu) |
| { |
| u32 val; |
| unsigned long flag; |
| |
| if (!rwbf_quirk && !cap_rwbf(iommu->cap)) |
| return; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flag); |
| writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG); |
| |
| /* Make sure hardware complete it */ |
| IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, |
| readl, (!(val & DMA_GSTS_WBFS)), val); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
| } |
| |
| /* return value determine if we need a write buffer flush */ |
| static void __iommu_flush_context(struct intel_iommu *iommu, |
| u16 did, u16 source_id, u8 function_mask, |
| u64 type) |
| { |
| u64 val = 0; |
| unsigned long flag; |
| |
| switch (type) { |
| case DMA_CCMD_GLOBAL_INVL: |
| val = DMA_CCMD_GLOBAL_INVL; |
| break; |
| case DMA_CCMD_DOMAIN_INVL: |
| val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did); |
| break; |
| case DMA_CCMD_DEVICE_INVL: |
| val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did) |
| | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask); |
| break; |
| default: |
| BUG(); |
| } |
| val |= DMA_CCMD_ICC; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flag); |
| dmar_writeq(iommu->reg + DMAR_CCMD_REG, val); |
| |
| /* Make sure hardware complete it */ |
| IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG, |
| dmar_readq, (!(val & DMA_CCMD_ICC)), val); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
| } |
| |
| /* return value determine if we need a write buffer flush */ |
| static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, |
| u64 addr, unsigned int size_order, u64 type) |
| { |
| int tlb_offset = ecap_iotlb_offset(iommu->ecap); |
| u64 val = 0, val_iva = 0; |
| unsigned long flag; |
| |
| switch (type) { |
| case DMA_TLB_GLOBAL_FLUSH: |
| /* global flush doesn't need set IVA_REG */ |
| val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT; |
| break; |
| case DMA_TLB_DSI_FLUSH: |
| val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); |
| break; |
| case DMA_TLB_PSI_FLUSH: |
| val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); |
| /* IH bit is passed in as part of address */ |
| val_iva = size_order | addr; |
| break; |
| default: |
| BUG(); |
| } |
| /* Note: set drain read/write */ |
| #if 0 |
| /* |
| * This is probably to be super secure.. Looks like we can |
| * ignore it without any impact. |
| */ |
| if (cap_read_drain(iommu->cap)) |
| val |= DMA_TLB_READ_DRAIN; |
| #endif |
| if (cap_write_drain(iommu->cap)) |
| val |= DMA_TLB_WRITE_DRAIN; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flag); |
| /* Note: Only uses first TLB reg currently */ |
| if (val_iva) |
| dmar_writeq(iommu->reg + tlb_offset, val_iva); |
| dmar_writeq(iommu->reg + tlb_offset + 8, val); |
| |
| /* Make sure hardware complete it */ |
| IOMMU_WAIT_OP(iommu, tlb_offset + 8, |
| dmar_readq, (!(val & DMA_TLB_IVT)), val); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
| |
| /* check IOTLB invalidation granularity */ |
| if (DMA_TLB_IAIG(val) == 0) |
| pr_err("Flush IOTLB failed\n"); |
| if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type)) |
| pr_debug("TLB flush request %Lx, actual %Lx\n", |
| (unsigned long long)DMA_TLB_IIRG(type), |
| (unsigned long long)DMA_TLB_IAIG(val)); |
| } |
| |
| static struct device_domain_info * |
| iommu_support_dev_iotlb (struct dmar_domain *domain, struct intel_iommu *iommu, |
| u8 bus, u8 devfn) |
| { |
| struct device_domain_info *info; |
| |
| assert_spin_locked(&device_domain_lock); |
| |
| if (!iommu->qi) |
| return NULL; |
| |
| list_for_each_entry(info, &domain->devices, link) |
| if (info->iommu == iommu && info->bus == bus && |
| info->devfn == devfn) { |
| if (info->ats_supported && info->dev) |
| return info; |
| break; |
| } |
| |
| return NULL; |
| } |
| |
| static void domain_update_iotlb(struct dmar_domain *domain) |
| { |
| struct device_domain_info *info; |
| bool has_iotlb_device = false; |
| |
| assert_spin_locked(&device_domain_lock); |
| |
| list_for_each_entry(info, &domain->devices, link) { |
| struct pci_dev *pdev; |
| |
| if (!info->dev || !dev_is_pci(info->dev)) |
| continue; |
| |
| pdev = to_pci_dev(info->dev); |
| if (pdev->ats_enabled) { |
| has_iotlb_device = true; |
| break; |
| } |
| } |
| |
| domain->has_iotlb_device = has_iotlb_device; |
| } |
| |
| static void iommu_enable_dev_iotlb(struct device_domain_info *info) |
| { |
| struct pci_dev *pdev; |
| |
| assert_spin_locked(&device_domain_lock); |
| |
| if (!info || !dev_is_pci(info->dev)) |
| return; |
| |
| pdev = to_pci_dev(info->dev); |
| |
| #ifdef CONFIG_INTEL_IOMMU_SVM |
| /* The PCIe spec, in its wisdom, declares that the behaviour of |
| the device if you enable PASID support after ATS support is |
| undefined. So always enable PASID support on devices which |
| have it, even if we can't yet know if we're ever going to |
| use it. */ |
| if (info->pasid_supported && !pci_enable_pasid(pdev, info->pasid_supported & ~1)) |
| info->pasid_enabled = 1; |
| |
| if (info->pri_supported && !pci_reset_pri(pdev) && !pci_enable_pri(pdev, 32)) |
| info->pri_enabled = 1; |
| #endif |
| if (info->ats_supported && !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) { |
| info->ats_enabled = 1; |
| domain_update_iotlb(info->domain); |
| info->ats_qdep = pci_ats_queue_depth(pdev); |
| } |
| } |
| |
| static void iommu_disable_dev_iotlb(struct device_domain_info *info) |
| { |
| struct pci_dev *pdev; |
| |
| assert_spin_locked(&device_domain_lock); |
| |
| if (!dev_is_pci(info->dev)) |
| return; |
| |
| pdev = to_pci_dev(info->dev); |
| |
| if (info->ats_enabled) { |
| pci_disable_ats(pdev); |
| info->ats_enabled = 0; |
| domain_update_iotlb(info->domain); |
| } |
| #ifdef CONFIG_INTEL_IOMMU_SVM |
| if (info->pri_enabled) { |
| pci_disable_pri(pdev); |
| info->pri_enabled = 0; |
| } |
| if (info->pasid_enabled) { |
| pci_disable_pasid(pdev); |
| info->pasid_enabled = 0; |
| } |
| #endif |
| } |
| |
| static void iommu_flush_dev_iotlb(struct dmar_domain *domain, |
| u64 addr, unsigned mask) |
| { |
| u16 sid, qdep; |
| unsigned long flags; |
| struct device_domain_info *info; |
| |
| if (!domain->has_iotlb_device) |
| return; |
| |
| spin_lock_irqsave(&device_domain_lock, flags); |
| list_for_each_entry(info, &domain->devices, link) { |
| if (!info->ats_enabled) |
| continue; |
| |
| sid = info->bus << 8 | info->devfn; |
| qdep = info->ats_qdep; |
| qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask); |
| } |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| } |
| |
| static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, |
| struct dmar_domain *domain, |
| unsigned long pfn, unsigned int pages, |
| int ih, int map) |
| { |
| unsigned int mask = ilog2(__roundup_pow_of_two(pages)); |
| uint64_t addr = (uint64_t)pfn << VTD_PAGE_SHIFT; |
| u16 did = domain->iommu_did[iommu->seq_id]; |
| |
| BUG_ON(pages == 0); |
| |
| if (ih) |
| ih = 1 << 6; |
| /* |
| * Fallback to domain selective flush if no PSI support or the size is |
| * too big. |
| * PSI requires page size to be 2 ^ x, and the base address is naturally |
| * aligned to the size |
| */ |
| if (!cap_pgsel_inv(iommu->cap) || mask > cap_max_amask_val(iommu->cap)) |
| iommu->flush.flush_iotlb(iommu, did, 0, 0, |
| DMA_TLB_DSI_FLUSH); |
| else |
| iommu->flush.flush_iotlb(iommu, did, addr | ih, mask, |
| DMA_TLB_PSI_FLUSH); |
| |
| /* |
| * In caching mode, changes of pages from non-present to present require |
| * flush. However, device IOTLB doesn't need to be flushed in this case. |
| */ |
| if (!cap_caching_mode(iommu->cap) || !map) |
| iommu_flush_dev_iotlb(get_iommu_domain(iommu, did), |
| addr, mask); |
| } |
| |
| static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu) |
| { |
| u32 pmen; |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flags); |
| pmen = readl(iommu->reg + DMAR_PMEN_REG); |
| pmen &= ~DMA_PMEN_EPM; |
| writel(pmen, iommu->reg + DMAR_PMEN_REG); |
| |
| /* wait for the protected region status bit to clear */ |
| IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG, |
| readl, !(pmen & DMA_PMEN_PRS), pmen); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
| } |
| |
| static void iommu_enable_translation(struct intel_iommu *iommu) |
| { |
| u32 sts; |
| unsigned long flags; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flags); |
| iommu->gcmd |= DMA_GCMD_TE; |
| writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
| |
| /* Make sure hardware complete it */ |
| IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, |
| readl, (sts & DMA_GSTS_TES), sts); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
| } |
| |
| static void iommu_disable_translation(struct intel_iommu *iommu) |
| { |
| u32 sts; |
| unsigned long flag; |
| |
| raw_spin_lock_irqsave(&iommu->register_lock, flag); |
| iommu->gcmd &= ~DMA_GCMD_TE; |
| writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
| |
| /* Make sure hardware complete it */ |
| IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, |
| readl, (!(sts & DMA_GSTS_TES)), sts); |
| |
| raw_spin_unlock_irqrestore(&iommu->register_lock, flag); |
| } |
| |
| |
| static int iommu_init_domains(struct intel_iommu *iommu) |
| { |
| u32 ndomains, nlongs; |
| size_t size; |
| |
| ndomains = cap_ndoms(iommu->cap); |
| pr_debug("%s: Number of Domains supported <%d>\n", |
| iommu->name, ndomains); |
| nlongs = BITS_TO_LONGS(ndomains); |
| |
| spin_lock_init(&iommu->lock); |
| |
| iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL); |
| if (!iommu->domain_ids) { |
| pr_err("%s: Allocating domain id array failed\n", |
| iommu->name); |
| return -ENOMEM; |
| } |
| |
| size = (ALIGN(ndomains, 256) >> 8) * sizeof(struct dmar_domain **); |
| iommu->domains = kzalloc(size, GFP_KERNEL); |
| |
| if (iommu->domains) { |
| size = 256 * sizeof(struct dmar_domain *); |
| iommu->domains[0] = kzalloc(size, GFP_KERNEL); |
| } |
| |
| if (!iommu->domains || !iommu->domains[0]) { |
| pr_err("%s: Allocating domain array failed\n", |
| iommu->name); |
| kfree(iommu->domain_ids); |
| kfree(iommu->domains); |
| iommu->domain_ids = NULL; |
| iommu->domains = NULL; |
| return -ENOMEM; |
| } |
| |
| |
| |
| /* |
| * If Caching mode is set, then invalid translations are tagged |
| * with domain-id 0, hence we need to pre-allocate it. We also |
| * use domain-id 0 as a marker for non-allocated domain-id, so |
| * make sure it is not used for a real domain. |
| */ |
| set_bit(0, iommu->domain_ids); |
| |
| return 0; |
| } |
| |
| static void disable_dmar_iommu(struct intel_iommu *iommu) |
| { |
| struct device_domain_info *info, *tmp; |
| unsigned long flags; |
| |
| if (!iommu->domains || !iommu->domain_ids) |
| return; |
| |
| again: |
| spin_lock_irqsave(&device_domain_lock, flags); |
| list_for_each_entry_safe(info, tmp, &device_domain_list, global) { |
| struct dmar_domain *domain; |
| |
| if (info->iommu != iommu) |
| continue; |
| |
| if (!info->dev || !info->domain) |
| continue; |
| |
| domain = info->domain; |
| |
| __dmar_remove_one_dev_info(info); |
| |
| if (!domain_type_is_vm_or_si(domain)) { |
| /* |
| * The domain_exit() function can't be called under |
| * device_domain_lock, as it takes this lock itself. |
| * So release the lock here and re-run the loop |
| * afterwards. |
| */ |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| domain_exit(domain); |
| goto again; |
| } |
| } |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| |
| if (iommu->gcmd & DMA_GCMD_TE) |
| iommu_disable_translation(iommu); |
| } |
| |
| static void free_dmar_iommu(struct intel_iommu *iommu) |
| { |
| if ((iommu->domains) && (iommu->domain_ids)) { |
| int elems = ALIGN(cap_ndoms(iommu->cap), 256) >> 8; |
| int i; |
| |
| for (i = 0; i < elems; i++) |
| kfree(iommu->domains[i]); |
| kfree(iommu->domains); |
| kfree(iommu->domain_ids); |
| iommu->domains = NULL; |
| iommu->domain_ids = NULL; |
| } |
| |
| g_iommus[iommu->seq_id] = NULL; |
| |
| /* free context mapping */ |
| free_context_table(iommu); |
| |
| #ifdef CONFIG_INTEL_IOMMU_SVM |
| if (pasid_enabled(iommu)) { |
| if (ecap_prs(iommu->ecap)) |
| intel_svm_finish_prq(iommu); |
| intel_svm_free_pasid_tables(iommu); |
| } |
| #endif |
| } |
| |
| static struct dmar_domain *alloc_domain(int flags) |
| { |
| struct dmar_domain *domain; |
| |
| domain = alloc_domain_mem(); |
| if (!domain) |
| return NULL; |
| |
| memset(domain, 0, sizeof(*domain)); |
| domain->nid = -1; |
| domain->flags = flags; |
| domain->has_iotlb_device = false; |
| INIT_LIST_HEAD(&domain->devices); |
| |
| return domain; |
| } |
| |
| /* Must be called with iommu->lock */ |
| static int domain_attach_iommu(struct dmar_domain *domain, |
| struct intel_iommu *iommu) |
| { |
| unsigned long ndomains; |
| int num; |
| |
| assert_spin_locked(&device_domain_lock); |
| assert_spin_locked(&iommu->lock); |
| |
| domain->iommu_refcnt[iommu->seq_id] += 1; |
| domain->iommu_count += 1; |
| if (domain->iommu_refcnt[iommu->seq_id] == 1) { |
| ndomains = cap_ndoms(iommu->cap); |
| num = find_first_zero_bit(iommu->domain_ids, ndomains); |
| |
| if (num >= ndomains) { |
| pr_err("%s: No free domain ids\n", iommu->name); |
| domain->iommu_refcnt[iommu->seq_id] -= 1; |
| domain->iommu_count -= 1; |
| return -ENOSPC; |
| } |
| |
| set_bit(num, iommu->domain_ids); |
| set_iommu_domain(iommu, num, domain); |
| |
| domain->iommu_did[iommu->seq_id] = num; |
| domain->nid = iommu->node; |
| |
| domain_update_iommu_cap(domain); |
| } |
| |
| return 0; |
| } |
| |
| static int domain_detach_iommu(struct dmar_domain *domain, |
| struct intel_iommu *iommu) |
| { |
| int num, count = INT_MAX; |
| |
| assert_spin_locked(&device_domain_lock); |
| assert_spin_locked(&iommu->lock); |
| |
| domain->iommu_refcnt[iommu->seq_id] -= 1; |
| count = --domain->iommu_count; |
| if (domain->iommu_refcnt[iommu->seq_id] == 0) { |
| num = domain->iommu_did[iommu->seq_id]; |
| clear_bit(num, iommu->domain_ids); |
| set_iommu_domain(iommu, num, NULL); |
| |
| domain_update_iommu_cap(domain); |
| domain->iommu_did[iommu->seq_id] = 0; |
| } |
| |
| return count; |
| } |
| |
| static struct iova_domain reserved_iova_list; |
| static struct lock_class_key reserved_rbtree_key; |
| |
| static int dmar_init_reserved_ranges(void) |
| { |
| struct pci_dev *pdev = NULL; |
| struct iova *iova; |
| int i; |
| |
| init_iova_domain(&reserved_iova_list, VTD_PAGE_SIZE, IOVA_START_PFN, |
| DMA_32BIT_PFN); |
| |
| lockdep_set_class(&reserved_iova_list.iova_rbtree_lock, |
| &reserved_rbtree_key); |
| |
| /* IOAPIC ranges shouldn't be accessed by DMA */ |
| iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START), |
| IOVA_PFN(IOAPIC_RANGE_END)); |
| if (!iova) { |
| pr_err("Reserve IOAPIC range failed\n"); |
| return -ENODEV; |
| } |
| |
| /* Reserve all PCI MMIO to avoid peer-to-peer access */ |
| for_each_pci_dev(pdev) { |
| struct resource *r; |
| |
| for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| r = &pdev->resource[i]; |
| if (!r->flags || !(r->flags & IORESOURCE_MEM)) |
| continue; |
| iova = reserve_iova(&reserved_iova_list, |
| IOVA_PFN(r->start), |
| IOVA_PFN(r->end)); |
| if (!iova) { |
| pr_err("Reserve iova failed\n"); |
| return -ENODEV; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static void domain_reserve_special_ranges(struct dmar_domain *domain) |
| { |
| copy_reserved_iova(&reserved_iova_list, &domain->iovad); |
| } |
| |
| static inline int guestwidth_to_adjustwidth(int gaw) |
| { |
| int agaw; |
| int r = (gaw - 12) % 9; |
| |
| if (r == 0) |
| agaw = gaw; |
| else |
| agaw = gaw + 9 - r; |
| if (agaw > 64) |
| agaw = 64; |
| return agaw; |
| } |
| |
| static int domain_init(struct dmar_domain *domain, struct intel_iommu *iommu, |
| int guest_width) |
| { |
| int adjust_width, agaw; |
| unsigned long sagaw; |
| |
| init_iova_domain(&domain->iovad, VTD_PAGE_SIZE, IOVA_START_PFN, |
| DMA_32BIT_PFN); |
| domain_reserve_special_ranges(domain); |
| |
| /* calculate AGAW */ |
| if (guest_width > cap_mgaw(iommu->cap)) |
| guest_width = cap_mgaw(iommu->cap); |
| domain->gaw = guest_width; |
| adjust_width = guestwidth_to_adjustwidth(guest_width); |
| agaw = width_to_agaw(adjust_width); |
| sagaw = cap_sagaw(iommu->cap); |
| if (!test_bit(agaw, &sagaw)) { |
| /* hardware doesn't support it, choose a bigger one */ |
| pr_debug("Hardware doesn't support agaw %d\n", agaw); |
| agaw = find_next_bit(&sagaw, 5, agaw); |
| if (agaw >= 5) |
| return -ENODEV; |
| } |
| domain->agaw = agaw; |
| |
| if (ecap_coherent(iommu->ecap)) |
| domain->iommu_coherency = 1; |
| else |
| domain->iommu_coherency = 0; |
| |
| if (ecap_sc_support(iommu->ecap)) |
| domain->iommu_snooping = 1; |
| else |
| domain->iommu_snooping = 0; |
| |
| if (intel_iommu_superpage) |
| domain->iommu_superpage = fls(cap_super_page_val(iommu->cap)); |
| else |
| domain->iommu_superpage = 0; |
| |
| domain->nid = iommu->node; |
| |
| /* always allocate the top pgd */ |
| domain->pgd = (struct dma_pte *)alloc_pgtable_page(domain->nid); |
| if (!domain->pgd) |
| return -ENOMEM; |
| __iommu_flush_cache(iommu, domain->pgd, PAGE_SIZE); |
| return 0; |
| } |
| |
| static void domain_exit(struct dmar_domain *domain) |
| { |
| struct page *freelist = NULL; |
| |
| /* Domain 0 is reserved, so dont process it */ |
| if (!domain) |
| return; |
| |
| /* Flush any lazy unmaps that may reference this domain */ |
| if (!intel_iommu_strict) { |
| int cpu; |
| |
| for_each_possible_cpu(cpu) |
| flush_unmaps_timeout(cpu); |
| } |
| |
| /* Remove associated devices and clear attached or cached domains */ |
| rcu_read_lock(); |
| domain_remove_dev_info(domain); |
| rcu_read_unlock(); |
| |
| /* destroy iovas */ |
| put_iova_domain(&domain->iovad); |
| |
| freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); |
| |
| dma_free_pagelist(freelist); |
| |
| free_domain_mem(domain); |
| } |
| |
| static int domain_context_mapping_one(struct dmar_domain *domain, |
| struct intel_iommu *iommu, |
| u8 bus, u8 devfn) |
| { |
| u16 did = domain->iommu_did[iommu->seq_id]; |
| int translation = CONTEXT_TT_MULTI_LEVEL; |
| struct device_domain_info *info = NULL; |
| struct context_entry *context; |
| unsigned long flags; |
| struct dma_pte *pgd; |
| int ret, agaw; |
| |
| WARN_ON(did == 0); |
| |
| if (hw_pass_through && domain_type_is_si(domain)) |
| translation = CONTEXT_TT_PASS_THROUGH; |
| |
| pr_debug("Set context mapping for %02x:%02x.%d\n", |
| bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); |
| |
| BUG_ON(!domain->pgd); |
| |
| spin_lock_irqsave(&device_domain_lock, flags); |
| spin_lock(&iommu->lock); |
| |
| ret = -ENOMEM; |
| context = iommu_context_addr(iommu, bus, devfn, 1); |
| if (!context) |
| goto out_unlock; |
| |
| ret = 0; |
| if (context_present(context)) |
| goto out_unlock; |
| |
| /* |
| * For kdump cases, old valid entries may be cached due to the |
| * in-flight DMA and copied pgtable, but there is no unmapping |
| * behaviour for them, thus we need an explicit cache flush for |
| * the newly-mapped device. For kdump, at this point, the device |
| * is supposed to finish reset at its driver probe stage, so no |
| * in-flight DMA will exist, and we don't need to worry anymore |
| * hereafter. |
| */ |
| if (context_copied(context)) { |
| u16 did_old = context_domain_id(context); |
| |
| if (did_old >= 0 && did_old < cap_ndoms(iommu->cap)) { |
| iommu->flush.flush_context(iommu, did_old, |
| (((u16)bus) << 8) | devfn, |
| DMA_CCMD_MASK_NOBIT, |
| DMA_CCMD_DEVICE_INVL); |
| iommu->flush.flush_iotlb(iommu, did_old, 0, 0, |
| DMA_TLB_DSI_FLUSH); |
| } |
| } |
| |
| pgd = domain->pgd; |
| |
| context_clear_entry(context); |
| context_set_domain_id(context, did); |
| |
| /* |
| * Skip top levels of page tables for iommu which has less agaw |
| * than default. Unnecessary for PT mode. |
| */ |
| if (translation != CONTEXT_TT_PASS_THROUGH) { |
| for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) { |
| ret = -ENOMEM; |
| pgd = phys_to_virt(dma_pte_addr(pgd)); |
| if (!dma_pte_present(pgd)) |
| goto out_unlock; |
| } |
| |
| info = iommu_support_dev_iotlb(domain, iommu, bus, devfn); |
| if (info && info->ats_supported) |
| translation = CONTEXT_TT_DEV_IOTLB; |
| else |
| translation = CONTEXT_TT_MULTI_LEVEL; |
| |
| context_set_address_root(context, virt_to_phys(pgd)); |
| context_set_address_width(context, iommu->agaw); |
| } else { |
| /* |
| * In pass through mode, AW must be programmed to |
| * indicate the largest AGAW value supported by |
| * hardware. And ASR is ignored by hardware. |
| */ |
| context_set_address_width(context, iommu->msagaw); |
| } |
| |
| context_set_translation_type(context, translation); |
| context_set_fault_enable(context); |
| context_set_present(context); |
| domain_flush_cache(domain, context, sizeof(*context)); |
| |
| /* |
| * It's a non-present to present mapping. If hardware doesn't cache |
| * non-present entry we only need to flush the write-buffer. If the |
| * _does_ cache non-present entries, then it does so in the special |
| * domain #0, which we have to flush: |
| */ |
| if (cap_caching_mode(iommu->cap)) { |
| iommu->flush.flush_context(iommu, 0, |
| (((u16)bus) << 8) | devfn, |
| DMA_CCMD_MASK_NOBIT, |
| DMA_CCMD_DEVICE_INVL); |
| iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH); |
| } else { |
| iommu_flush_write_buffer(iommu); |
| } |
| iommu_enable_dev_iotlb(info); |
| |
| ret = 0; |
| |
| out_unlock: |
| spin_unlock(&iommu->lock); |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| |
| return ret; |
| } |
| |
| struct domain_context_mapping_data { |
| struct dmar_domain *domain; |
| struct intel_iommu *iommu; |
| }; |
| |
| static int domain_context_mapping_cb(struct pci_dev *pdev, |
| u16 alias, void *opaque) |
| { |
| struct domain_context_mapping_data *data = opaque; |
| |
| return domain_context_mapping_one(data->domain, data->iommu, |
| PCI_BUS_NUM(alias), alias & 0xff); |
| } |
| |
| static int |
| domain_context_mapping(struct dmar_domain *domain, struct device *dev) |
| { |
| struct intel_iommu *iommu; |
| u8 bus, devfn; |
| struct domain_context_mapping_data data; |
| |
| iommu = device_to_iommu(dev, &bus, &devfn); |
| if (!iommu) |
| return -ENODEV; |
| |
| if (!dev_is_pci(dev)) |
| return domain_context_mapping_one(domain, iommu, bus, devfn); |
| |
| data.domain = domain; |
| data.iommu = iommu; |
| |
| return pci_for_each_dma_alias(to_pci_dev(dev), |
| &domain_context_mapping_cb, &data); |
| } |
| |
| static int domain_context_mapped_cb(struct pci_dev *pdev, |
| u16 alias, void *opaque) |
| { |
| struct intel_iommu *iommu = opaque; |
| |
| return !device_context_mapped(iommu, PCI_BUS_NUM(alias), alias & 0xff); |
| } |
| |
| static int domain_context_mapped(struct device *dev) |
| { |
| struct intel_iommu *iommu; |
| u8 bus, devfn; |
| |
| iommu = device_to_iommu(dev, &bus, &devfn); |
| if (!iommu) |
| return -ENODEV; |
| |
| if (!dev_is_pci(dev)) |
| return device_context_mapped(iommu, bus, devfn); |
| |
| return !pci_for_each_dma_alias(to_pci_dev(dev), |
| domain_context_mapped_cb, iommu); |
| } |
| |
| /* Returns a number of VTD pages, but aligned to MM page size */ |
| static inline unsigned long aligned_nrpages(unsigned long host_addr, |
| size_t size) |
| { |
| host_addr &= ~PAGE_MASK; |
| return PAGE_ALIGN(host_addr + size) >> VTD_PAGE_SHIFT; |
| } |
| |
| /* Return largest possible superpage level for a given mapping */ |
| static inline int hardware_largepage_caps(struct dmar_domain *domain, |
| unsigned long iov_pfn, |
| unsigned long phy_pfn, |
| unsigned long pages) |
| { |
| int support, level = 1; |
| unsigned long pfnmerge; |
| |
| support = domain->iommu_superpage; |
| |
| /* To use a large page, the virtual *and* physical addresses |
| must be aligned to 2MiB/1GiB/etc. Lower bits set in either |
| of them will mean we have to use smaller pages. So just |
| merge them and check both at once. */ |
| pfnmerge = iov_pfn | phy_pfn; |
| |
| while (support && !(pfnmerge & ~VTD_STRIDE_MASK)) { |
| pages >>= VTD_STRIDE_SHIFT; |
| if (!pages) |
| break; |
| pfnmerge >>= VTD_STRIDE_SHIFT; |
| level++; |
| support--; |
| } |
| return level; |
| } |
| |
| static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, |
| struct scatterlist *sg, unsigned long phys_pfn, |
| unsigned long nr_pages, int prot) |
| { |
| struct dma_pte *first_pte = NULL, *pte = NULL; |
| phys_addr_t uninitialized_var(pteval); |
| unsigned long sg_res = 0; |
| unsigned int largepage_lvl = 0; |
| unsigned long lvl_pages = 0; |
| |
| BUG_ON(!domain_pfn_supported(domain, iov_pfn + nr_pages - 1)); |
| |
| if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) |
| return -EINVAL; |
| |
| prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP; |
| |
| if (!sg) { |
| sg_res = nr_pages; |
| pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot; |
| } |
| |
| while (nr_pages > 0) { |
| uint64_t tmp; |
| |
| if (!sg_res) { |
| sg_res = aligned_nrpages(sg->offset, sg->length); |
| sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset; |
| sg->dma_length = sg->length; |
| pteval = page_to_phys(sg_page(sg)) | prot; |
| phys_pfn = pteval >> VTD_PAGE_SHIFT; |
| } |
| |
| if (!pte) { |
| largepage_lvl = hardware_largepage_caps(domain, iov_pfn, phys_pfn, sg_res); |
| |
| first_pte = pte = pfn_to_dma_pte(domain, iov_pfn, &largepage_lvl); |
| if (!pte) |
| return -ENOMEM; |
| /* It is large page*/ |
| if (largepage_lvl > 1) { |
| unsigned long nr_superpages, end_pfn; |
| |
| pteval |= DMA_PTE_LARGE_PAGE; |
| lvl_pages = lvl_to_nr_pages(largepage_lvl); |
| |
| nr_superpages = sg_res / lvl_pages; |
| end_pfn = iov_pfn + nr_superpages * lvl_pages - 1; |
| |
| /* |
| * Ensure that old small page tables are |
| * removed to make room for superpage(s). |
| */ |
| dma_pte_free_pagetable(domain, iov_pfn, end_pfn); |
| } else { |
| pteval &= ~(uint64_t)DMA_PTE_LARGE_PAGE; |
| } |
| |
| } |
| /* We don't need lock here, nobody else |
| * touches the iova range |
| */ |
| tmp = cmpxchg64_local(&pte->val, 0ULL, pteval); |
| if (tmp) { |
| static int dumps = 5; |
| pr_crit("ERROR: DMA PTE for vPFN 0x%lx already set (to %llx not %llx)\n", |
| iov_pfn, tmp, (unsigned long long)pteval); |
| if (dumps) { |
| dumps--; |
| debug_dma_dump_mappings(NULL); |
| } |
| WARN_ON(1); |
| } |
| |
| lvl_pages = lvl_to_nr_pages(largepage_lvl); |
| |
| BUG_ON(nr_pages < lvl_pages); |
| BUG_ON(sg_res < lvl_pages); |
| |
| nr_pages -= lvl_pages; |
| iov_pfn += lvl_pages; |
| phys_pfn += lvl_pages; |
| pteval += lvl_pages * VTD_PAGE_SIZE; |
| sg_res -= lvl_pages; |
| |
| /* If the next PTE would be the first in a new page, then we |
| need to flush the cache on the entries we've just written. |
| And then we'll need to recalculate 'pte', so clear it and |
| let it get set again in the if (!pte) block above. |
| |
| If we're done (!nr_pages) we need to flush the cache too. |
| |
| Also if we've been setting superpages, we may need to |
| recalculate 'pte' and switch back to smaller pages for the |
| end of the mapping, if the trailing size is not enough to |
| use another superpage (i.e. sg_res < lvl_pages). */ |
| pte++; |
| if (!nr_pages || first_pte_in_page(pte) || |
| (largepage_lvl > 1 && sg_res < lvl_pages)) { |
| domain_flush_cache(domain, first_pte, |
| (void *)pte - (void *)first_pte); |
| pte = NULL; |
| } |
| |
| if (!sg_res && nr_pages) |
| sg = sg_next(sg); |
| } |
| return 0; |
| } |
| |
| static inline int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn, |
| struct scatterlist *sg, unsigned long nr_pages, |
| int prot) |
| { |
| return __domain_mapping(domain, iov_pfn, sg, 0, nr_pages, prot); |
| } |
| |
| static inline int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn, |
| unsigned long phys_pfn, unsigned long nr_pages, |
| int prot) |
| { |
| return __domain_mapping(domain, iov_pfn, NULL, phys_pfn, nr_pages, prot); |
| } |
| |
| static void domain_context_clear_one(struct intel_iommu *iommu, u8 bus, u8 devfn) |
| { |
| if (!iommu) |
| return; |
| |
| clear_context_table(iommu, bus, devfn); |
| iommu->flush.flush_context(iommu, 0, 0, 0, |
| DMA_CCMD_GLOBAL_INVL); |
| iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH); |
| } |
| |
| static inline void unlink_domain_info(struct device_domain_info *info) |
| { |
| assert_spin_locked(&device_domain_lock); |
| list_del(&info->link); |
| list_del(&info->global); |
| if (info->dev) |
| info->dev->archdata.iommu = NULL; |
| } |
| |
| static void domain_remove_dev_info(struct dmar_domain *domain) |
| { |
| struct device_domain_info *info, *tmp; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&device_domain_lock, flags); |
| list_for_each_entry_safe(info, tmp, &domain->devices, link) |
| __dmar_remove_one_dev_info(info); |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| } |
| |
| /* |
| * find_domain |
| * Note: we use struct device->archdata.iommu stores the info |
| */ |
| static struct dmar_domain *find_domain(struct device *dev) |
| { |
| struct device_domain_info *info; |
| |
| /* No lock here, assumes no domain exit in normal case */ |
| info = dev->archdata.iommu; |
| if (info) |
| return info->domain; |
| return NULL; |
| } |
| |
| static inline struct device_domain_info * |
| dmar_search_domain_by_dev_info(int segment, int bus, int devfn) |
| { |
| struct device_domain_info *info; |
| |
| list_for_each_entry(info, &device_domain_list, global) |
| if (info->iommu->segment == segment && info->bus == bus && |
| info->devfn == devfn) |
| return info; |
| |
| return NULL; |
| } |
| |
| static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu, |
| int bus, int devfn, |
| struct device *dev, |
| struct dmar_domain *domain) |
| { |
| struct dmar_domain *found = NULL; |
| struct device_domain_info *info; |
| unsigned long flags; |
| int ret; |
| |
| info = alloc_devinfo_mem(); |
| if (!info) |
| return NULL; |
| |
| info->bus = bus; |
| info->devfn = devfn; |
| info->ats_supported = info->pasid_supported = info->pri_supported = 0; |
| info->ats_enabled = info->pasid_enabled = info->pri_enabled = 0; |
| info->ats_qdep = 0; |
| info->dev = dev; |
| info->domain = domain; |
| info->iommu = iommu; |
| |
| if (dev && dev_is_pci(dev)) { |
| struct pci_dev *pdev = to_pci_dev(info->dev); |
| |
| if (ecap_dev_iotlb_support(iommu->ecap) && |
| pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS) && |
| dmar_find_matched_atsr_unit(pdev)) |
| info->ats_supported = 1; |
| |
| if (ecs_enabled(iommu)) { |
| if (pasid_enabled(iommu)) { |
| int features = pci_pasid_features(pdev); |
| if (features >= 0) |
| info->pasid_supported = features | 1; |
| } |
| |
| if (info->ats_supported && ecap_prs(iommu->ecap) && |
| pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI)) |
| info->pri_supported = 1; |
| } |
| } |
| |
| spin_lock_irqsave(&device_domain_lock, flags); |
| if (dev) |
| found = find_domain(dev); |
| |
| if (!found) { |
| struct device_domain_info *info2; |
| info2 = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn); |
| if (info2) { |
| found = info2->domain; |
| info2->dev = dev; |
| } |
| } |
| |
| if (found) { |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| free_devinfo_mem(info); |
| /* Caller must free the original domain */ |
| return found; |
| } |
| |
| spin_lock(&iommu->lock); |
| ret = domain_attach_iommu(domain, iommu); |
| spin_unlock(&iommu->lock); |
| |
| if (ret) { |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| free_devinfo_mem(info); |
| return NULL; |
| } |
| |
| list_add(&info->link, &domain->devices); |
| list_add(&info->global, &device_domain_list); |
| if (dev) |
| dev->archdata.iommu = info; |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| |
| if (dev && domain_context_mapping(domain, dev)) { |
| pr_err("Domain context map for %s failed\n", dev_name(dev)); |
| dmar_remove_one_dev_info(domain, dev); |
| return NULL; |
| } |
| |
| return domain; |
| } |
| |
| static int get_last_alias(struct pci_dev *pdev, u16 alias, void *opaque) |
| { |
| *(u16 *)opaque = alias; |
| return 0; |
| } |
| |
| static struct dmar_domain *find_or_alloc_domain(struct device *dev, int gaw) |
| { |
| struct device_domain_info *info = NULL; |
| struct dmar_domain *domain = NULL; |
| struct intel_iommu *iommu; |
| u16 req_id, dma_alias; |
| unsigned long flags; |
| u8 bus, devfn; |
| |
| iommu = device_to_iommu(dev, &bus, &devfn); |
| if (!iommu) |
| return NULL; |
| |
| req_id = ((u16)bus << 8) | devfn; |
| |
| if (dev_is_pci(dev)) { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias); |
| |
| spin_lock_irqsave(&device_domain_lock, flags); |
| info = dmar_search_domain_by_dev_info(pci_domain_nr(pdev->bus), |
| PCI_BUS_NUM(dma_alias), |
| dma_alias & 0xff); |
| if (info) { |
| iommu = info->iommu; |
| domain = info->domain; |
| } |
| spin_unlock_irqrestore(&device_domain_lock, flags); |
| |
| /* DMA alias already has a domain, use it */ |
| if (info) |
| goto out; |
| } |
| |
| /* Allocate and initialize new domain for the device */ |
| domain = alloc_domain(0); |
| if (!domain) |
| return NULL; |
| if (domain_init(domain, iommu, gaw)) { |
| domain_exit(domain); |
| return NULL; |
| } |
| |
| out: |
| |
| return domain; |
| } |
| |
| static struct dmar_domain *set_domain_for_dev(struct device *dev, |
| struct dmar_domain *domain) |
| { |
| struct intel_iommu *iommu; |
| struct dmar_domain *tmp; |
| u16 req_id, dma_alias; |
| u8 bus, devfn; |
| |
| iommu = device_to_iommu(dev, &bus, &devfn); |
| if (!iommu) |
| return NULL; |
| |
| req_id = ((u16)bus << 8) | devfn; |
| |
| if (dev_is_pci(dev)) { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias); |
| |
| /* register PCI DMA alias device */ |
| if (req_id != dma_alias) { |
| tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias), |
| dma_alias & 0xff, NULL, domain); |
| |
| if (!tmp || tmp != domain) |
| return tmp; |
| } |
| } |
| |
| tmp = dmar_insert_one_dev_info(iommu, bus, devfn, dev, domain); |
| if (!tmp || tmp != domain) |
| return tmp; |
| |
| return domain; |
| } |
| |
| static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw) |
| { |
| struct dmar_domain *domain, *tmp; |
| |
| domain = find_domain(dev); |
| if (domain) |
| goto out; |
| |
| domain = find_or_alloc_domain(dev, gaw); |
| if (!domain) |
| goto out; |
| |
| tmp = set_domain_for_dev(dev, domain); |
| if (!tmp || domain != tmp) { |
| domain_exit(domain); |
| domain = tmp; |
| } |
| |
| out: |
| |
| return domain; |
| } |
| |
| static int iommu_domain_identity_map(struct dmar_domain *domain, |
| unsigned long long start, |
| unsigned long long end) |
| { |
| unsigned long first_vpfn = start >> VTD_PAGE_SHIFT; |
| unsigned long last_vpfn = end >> VTD_PAGE_SHIFT; |
| |
| if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn), |
| dma_to_mm_pfn(last_vpfn))) { |
| pr_err("Reserving iova failed\n"); |
| return -ENOMEM; |
| } |
| |
| pr_debug("Mapping reserved region %llx-%llx\n", start, end); |
| /* |
| * RMRR range might have overlap with physical memory range, |
| * clear it first |
| */ |
| dma_pte_clear_range(domain, first_vpfn, last_vpfn); |
| |
| return domain_pfn_mapping(domain, first_vpfn, first_vpfn, |
| last_vpfn - first_vpfn + 1, |
| DMA_PTE_READ|DMA_PTE_WRITE); |
| } |
| |
| static int domain_prepare_identity_map(struct device *dev, |
| struct dmar_domain *domain, |
| unsigned long long start, |
| unsigned long long end) |
| { |
| /* For _hardware_ passthrough, don't bother. But for software |
| passthrough, we do it anyway -- it may indicate a memory |
| range which is reserved in E820, so which didn't get set |
| up to start with in si_domain */ |
| if (domain == si_domain && hw_pass_through) { |
| pr_warn("Ignoring identity map for HW passthrough device %s [0x%Lx - 0x%Lx]\n", |
| dev_name(dev), start, end); |
| return 0; |
| } |
| |
| pr_info("Setting identity map for device %s [0x%Lx - 0x%Lx]\n", |
| dev_name(dev), start, end); |
| |
| if (end < start) { |
| WARN(1, "Your BIOS is broken; RMRR ends before it starts!\n" |
| "BIOS vendor: %s; Ver: %s; Product Version: %s\n", |
| dmi_get_system_info(DMI_BIOS_VENDOR), |
| dmi_get_system_info(DMI_BIOS_VERSION), |
| dmi_get_system_info(DMI_PRODUCT_VERSION)); |
| return -EIO; |
| } |
| |
| if (end >> agaw_to_width(domain->agaw)) { |
| WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n" |
| "BIOS vendor: %s; Ver: %s; Product Version: %s\n", |
| agaw_to_width(domain->agaw), |
| dmi_get_system_info(DMI_BIOS_VENDOR), |
| dmi_get_system_info(DMI_BIOS_VERSION), |
| dmi_get_system_info(DMI_PRODUCT_VERSION)); |
| return -EIO; |
| } |
| |
| return iommu_domain_identity_map(domain, start, end); |
| } |
| |
| static int iommu_prepare_identity_map(struct device *dev, |
| unsigned long long start, |
| unsigned long long end) |
| { |
| struct dmar_domain *domain; |
| int ret; |
| |
| domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH); |
| if (!domain) |
| return -ENOMEM; |
| |
| ret = domain_prepare_identity_map(dev, domain, start, end); |
| if (ret) |
| domain_exit(domain); |
| |
| return ret; |
| } |
| |
| static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr, |
| struct device *dev) |
| { |
| if (dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) |
| return 0; |
| return iommu_prepare_identity_map(dev, rmrr->base_address, |
| rmrr->end_address); |
| } |
| |
| #ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA |
| static inline void iommu_prepare_isa(void) |
| { |
| struct pci_dev *pdev; |
| int ret; |
| |
| pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL); |
| if (!pdev) |
| return; |
| |
| pr_info("Prepare 0-16MiB unity mapping for LPC\n"); |
| ret = iommu_prepare_identity_map(&pdev->dev, 0, 16*1024*1024 - 1); |
| |
| if (ret) |
| pr_err("Failed to create 0-16MiB identity map - floppy might not work\n"); |
| |
| pci_dev_put(pdev); |
| } |
| #else |
| static inline void iommu_prepare_isa(void) |
| { |
| return; |
| } |
| #endif /* !CONFIG_INTEL_IOMMU_FLPY_WA */ |
| |
| static int md_domain_init(struct dmar_domain *domain, int guest_width); |
| |
| static int __init si_domain_init(int hw) |
| { |
| int nid, ret = 0; |
| |
| si_domain = alloc_domain(DOMAIN_FLAG_STATIC_IDENTITY); |
| if (!si_domain) |
| return -EFAULT; |
| |
| if (md_domain_init(si_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) { |
| domain_exit(si_domain); |
| return -EFAULT; |
| } |
| |
| pr_debug("Identity mapping domain allocated\n"); |
| |
| if (hw) |
| return 0; |
| |
| for_each_online_node(nid) { |
| unsigned long start_pfn, end_pfn; |
| int i; |
| |
| for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) { |
| ret = iommu_domain_identity_map(si_domain, |
| PFN_PHYS(start_pfn), PFN_PHYS(end_pfn)); |
| if (ret) |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int identity_mapping(struct device *dev) |
| { |
| struct device_domain_info *info; |
| |
| if (likely(!iommu_identity_mapping)) |
| return 0; |
| |
| info = dev->archdata.iommu; |
| if (info && info != DUMMY_DEVICE_DOMAIN_INFO) |
| return (info->domain == si_domain); |
| |
| return 0; |
| } |
| |
| static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev) |
| { |
| struct dmar_domain *ndomain; |
| struct intel_iommu *iommu; |
| u8 bus, devfn; |
| |
| iommu = device_to_iommu(dev, &bus, &devfn); |
| if (!iommu) |
| return -ENODEV; |
| |
| ndomain = dmar_insert_one_dev_info(iommu, bus, devfn, dev, domain); |
| if (ndomain != domain) |
| return -EBUSY; |
| |
| return 0; |
| } |
| |
| static bool device_has_rmrr(struct device *dev) |
| { |
| struct dmar_rmrr_unit *rmrr; |
| struct device *tmp; |
| int i; |
| |
| rcu_read_lock(); |
| for_each_rmrr_units(rmrr) { |
| /* |
| * Return TRUE if this RMRR contains the device that |
| * is passed in. |
| */ |
| for_each_active_dev_scope(rmrr->devices, |
| rmrr->devices_cnt, i, tmp) |
| if (tmp == dev) { |
| rcu_read_unlock(); |
| return true; |
| } |
| } |
| rcu_read_unlock(); |
| return false; |
| } |
| |
| /* |
| * There are a couple cases where we need to restrict the functionality of |
| * devices associated with RMRRs. The first is when evaluating a device for |
| * identity mapping because problems exist when devices are moved in and out |
| * of domains and their respective RMRR information is lost. This means that |
| * a device with associated RMRRs will never be in a "passthrough" domain. |
| * The second is use of the device through the IOMMU API. This interface |
| * expects to have full control of the IOVA space for the device. We cannot |
| * satisfy both the requirement that RMRR access is maintained and have an |
| * unencumbered IOVA space. We also have no ability to quiesce the device's |
| * use of the RMRR space or even inform the IOMMU API user of the restriction. |
| * We therefore prevent devices associated with an RMRR from participating in |
| * the IOMMU API, which eliminates them from device assignment. |
| * |
| * In both cases we assume that PCI USB devices with RMRRs have them largely |
| * for historical reasons and that the RMRR space is not actively used post |
| * boot. This exclusion may change if vendors begin to abuse it. |
| * |
| * The same exception is made for graphics devices, with the requirement that |
| * any use of the RMRR regions will be torn down before assigning the device |
| * to a guest. |
| */ |
| static bool device_is_rmrr_locked(struct device *dev) |
| { |
| if (!device_has_rmrr(dev)) |
| return false; |
| |
| if (dev_is_pci(dev)) { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| if (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static int iommu_should_identity_map(struct device *dev, int startup) |
| { |
| |
| if (dev_is_pci(dev)) { |
| struct pci_dev *pdev = to_pci_dev(dev); |
| |
| if (device_is_rmrr_locked(dev)) |
| return 0; |
| |
| if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev)) |
| return 1; |
| |
| if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev)) |
| return 1; |
| |
| if (!(iommu_identity_mapping & IDENTMAP_ALL)) |
| return 0; |
| |
| /* |
| * We want to start off with all devices in the 1:1 domain, and |
| * take them out later if we find they can't access all of memory. |
| * |
| * However, we can't do this for PCI devices behind bridges, |
| * because all PCI devices behind the same bridge will end up |
| * with the same source-id on their transactions. |
| * |
| * Practically speaking, we can't change things around for these |
| * devices at run-time, because we can't be sure there'll be no |
| * DMA transactions in flight for any of their siblings. |
| * |
| * So PCI devices (unless they're on the root bus) as well as |
| * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of |
| * the 1:1 domain, just in _case_ one of their siblings turns out |
| * not to be able to map all of memory. |
| */ |
| if (!pci_is_pcie(pdev)) { |
| if (!pci_is_root_bus(pdev->bus)) |
| return 0; |
| if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI) |
| return 0; |
| } else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE) |
| return 0; |
| } else { |
| if (device_has_rmrr(dev)) |
| return 0; |
| } |
| |
| /* |
| * At boot time, we don't yet know if devices will be 64-bit capable. |
| * Assume that they will — if they turn out not to be, then we can |
| * take them out of the 1:1 domain later. |
| */ |
| if (!startup) { |
| /* |
| * If the device's dma_mask is less than the system's memory |
| * size then this is not a candidate for identity mapping. |
| */ |
| u64 dma_mask = *dev->dma_mask; |
| |
| if (dev->coherent_dma_mask && |
| dev->coherent_dma_mask < dma_mask) |
| dma_mask = dev->coherent_dma_mask; |
| |
| return dma_mask >= dma_get_required_mask(dev); |
| } |
| |
| return 1; |
| } |
| |
| static int __init dev_prepare_static_identity_mapping(struct device *dev, int hw) |
| { |
| int ret; |
| |
| if (!iommu_should_identity_map(dev, 1)) |
| return 0; |
| |
| ret = domain_add_dev_info(si_domain, dev); |
| if (!ret) |
| pr_info("%s identity mapping for device %s\n", |
| hw ? "Hardware" : "Software", dev_name(dev)); |
| else if (ret == -ENODEV) |
| /* device not associated with an iommu */ |
| ret = 0; |
| |
| return ret; |
| } |
| |
| |
| static int __init iommu_prepare_static_identity_mapping(int hw) |
| { |
| struct pci_dev *pdev = NULL; |
| struct dmar_drhd_unit *drhd; |
| struct intel_iommu *iommu; |
| struct device *dev; |
| int i; |
| int ret = 0; |
| |
| for_each_pci_dev(pdev) { |
| ret = dev_prepare_static_identity_mapping(&pdev->dev, hw); |
| if (ret) |
| return ret; |
| } |
| |
| for_each_active_iommu(iommu, drhd) |
| for_each_active_dev_scope(drhd->devices, drhd->devices_cnt, i, dev) { |
| struct acpi_device_physical_node *pn; |
| struct acpi_device *adev; |
| |
| if (dev->bus != &acpi_bus_type) |
| continue; |
| |
| adev= to_acpi_device(dev); |
| mutex_lock(&adev->physical_node_lock); |
| list_for_each_entry(pn, &adev->physical_node_list, node) { |
| ret = dev_prepare_static_identity_mapping(pn->dev, hw); |
| if (ret) |
| break; |
| } |
| mutex_unlock(&adev->physical_node_lock); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static void intel_iommu_init_qi(struct intel_iommu *iommu) |
| { |
| /* |
| * Start from the sane iommu hardware state. |
| * If the queued invalidation is already initialized by us |
| * (for example, while enabling interrupt-remapping) then |
| * we got the things already rolling from a sane state. |
| */ |
| if (!iommu->qi) { |
| /* |
| * Clear any previous faults. |
| */ |
| dmar_fault(-1, iommu); |
| /* |
| * Disable queued invalidation if supported and already enabled |
| * before OS handover. |
| */ |
| dmar_disable_qi(iommu); |
| } |
| |
| if (dmar_enable_qi(iommu)) { |
| /* |
| * Queued Invalidate not enabled, use Register Based Invalidate |
| */ |
| iommu->flush.flush_context = __iommu_flush_context; |
| iommu->flush.flush_iotlb = __iommu_flush_iotlb; |
| pr_info("%s: Using Register based invalidation\n", |
| iommu->name); |
| } else { |
| iommu->flush.flush_context = qi_flush_context; |
| iommu->flush.flush_iotlb = qi_flush_iotlb; |
| pr_info("%s: Using Queued invalidation\n", iommu->name); |
| } |
| } |
| |
| static int copy_context_table(struct intel_iommu *iommu, |
| struct root_entry *old_re, |
| struct context_entry **tbl, |
| int bus, bool ext) |
| { |
| int tbl_idx, pos = 0, idx, devfn, ret = 0, did; |
| struct context_entry *new_ce = NULL, ce; |
| struct context_entry *old_ce = NULL; |
| struct root_entry re; |
| phys_addr_t old_ce_phys; |
| |
| tbl_idx = ext ? bus * 2 : bus; |
| memcpy(&re, old_re, sizeof(re)); |
| |
| for (devfn = 0; devfn < 256; devfn++) { |
| /* First calculate the correct index */ |
| idx = (ext ? devfn * 2 : devfn) % 256; |
| |
| if (idx == 0) { |
| /* First save what we may have and clean up */ |
| if (new_ce) { |
| tbl[tbl_idx] = new_ce; |
| __iommu_flush_cache(iommu, new_ce, |
| VTD_PAGE_SIZE); |
| pos = 1; |
| } |
| |
| if (old_ce) |
| iounmap(old_ce); |
| |
| ret = 0; |
| if (devfn < 0x80) |
| old_ce_phys = root_entry_lctp(&re); |
| else |
| old_ce_phys = root_entry_uctp(&re); |
| |
| if (!old_ce_phys) { |
| if (ext && devfn == 0) { |
| /* No LCTP, try UCTP */ |
| devfn = 0x7f; |
| continue; |
| } else { |
| goto out; |
| } |
| } |
| |
| ret = -ENOMEM; |
| old_ce = memremap(old_ce_phys, PAGE_SIZE, |
| MEMREMAP_WB); |
| if (!old_ce) |
| goto out; |
| |
| new_ce = alloc_pgtable_page(iommu->node); |
| if (!new_ce) |
| goto out_unmap; |
| |
| ret = 0; |
| } |
| |
| /* Now copy the context entry */ |
| memcpy(&ce, old_ce + idx, sizeof(ce)); |
| |
| if (!__context_present(&ce)) |
| continue; |
| |
| did = context_domain_id(&ce); |
| if (did >= 0 && did < cap_ndoms(iommu->cap)) |
| set_bit(did, iommu->domain_ids); |
| |
| /* |
| * We need a marker for copied context entries. This |
| * marker needs to work for the old format as well as |
| * for extended context entries. |
| * |
| * Bit 67 of the context entry is used. In the old |
| * format this bit is available to software, in the |
| * extended format it is the PGE bit, but PGE is ignored |
| * by HW if PASIDs are disabled (and thus still |
| * available). |
| * |
| * So disable PASIDs first and then mark the entry |
| * copied. This means that we don't copy PASID |
| * translations from the old kernel, but this is fine as |
| * faults there are not fatal. |
| */ |
| context_clear_pasid_enable(&ce); |
| context_set_copied(&ce); |
| |
| new_ce[idx] = ce; |
| } |
| |
| tbl[tbl_idx + pos] = new_ce; |
| |
| __iommu_flush_cache(iommu, new_ce, VTD_PAGE_SIZE); |
| |
| out_unmap: |
| memunmap(old_ce); |
| |
| out: |
| return ret; |
| } |
| |
| static int copy_translation_tables(struct intel_iommu *iommu) |
| { |
| struct context_entry **ctxt_tbls; |
| struct root_entry *old_rt; |
| phys_addr_t old_rt_phys; |
| int ctxt_table_entries; |
| unsigned long flags; |
| u64 rtaddr_reg; |
| int bus, ret; |
| bool new_ext, ext; |
| |
| rtaddr_reg = dmar_readq(iommu->reg + DMAR_RTADDR_REG); |
| ext = !!(rtaddr_reg & DMA_RTADDR_RTT); |
| new_ext = !!ecap_ecs(iommu->ecap); |
| |
| /* |
| * The RTT bit can only be changed when translation is disabled, |
| * but disabling translation means to open a window for data |
| * corruption. So bail out and don't copy anything if we would |
| * have to change the bit. |
| */ |
| if (new_ext != ext) |
| return -EINVAL; |
| |
| old_rt_phys = rtaddr_reg & VTD_PAGE_MASK; |
| if (!old_rt_phys) |
| return -EINVAL; |
| |
| old_rt = memremap(old_rt_phys, PAGE_SIZE, MEMREMAP_WB); |
| if (!old_rt) |
| return -ENOMEM; |
| |
| /* This is too big for the stack - a
|