diff options
Diffstat (limited to 'drivers/iommu/intel/iommu.c')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 9a356075d345..abb2599998b1 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -156,6 +156,8 @@ static struct intel_iommu **g_iommus; static void __init check_tylersburg_isoch(void); static int rwbf_quirk; +static inline struct device_domain_info * +dmar_search_domain_by_dev_info(int segment, int bus, int devfn); /* * set to 1 to panic kernel if can't successfully enable VT-d @@ -996,6 +998,117 @@ out: spin_unlock_irqrestore(&iommu->lock, flags); } +#ifdef CONFIG_DMAR_DEBUG +static void pgtable_walk(struct intel_iommu *iommu, unsigned long pfn, u8 bus, u8 devfn) +{ + struct device_domain_info *info; + struct dma_pte *parent, *pte; + struct dmar_domain *domain; + int offset, level; + + info = dmar_search_domain_by_dev_info(iommu->segment, bus, devfn); + if (!info || !info->domain) { + pr_info("device [%02x:%02x.%d] not probed\n", + bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); + return; + } + + domain = info->domain; + level = agaw_to_level(domain->agaw); + parent = domain->pgd; + if (!parent) { + pr_info("no page table setup\n"); + return; + } + + while (1) { + offset = pfn_level_offset(pfn, level); + pte = &parent[offset]; + if (!pte || (dma_pte_superpage(pte) || !dma_pte_present(pte))) { + pr_info("PTE not present at level %d\n", level); + break; + } + + pr_info("pte level: %d, pte value: 0x%016llx\n", level, pte->val); + + if (level == 1) + break; + + parent = phys_to_virt(dma_pte_addr(pte)); + level--; + } +} + +void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id, + unsigned long long addr, u32 pasid) +{ + struct pasid_dir_entry *dir, *pde; + struct pasid_entry *entries, *pte; + struct context_entry *ctx_entry; + struct root_entry *rt_entry; + u8 devfn = source_id & 0xff; + u8 bus = source_id >> 8; + int i, dir_index, index; + + pr_info("Dump %s table entries for IOVA 0x%llx\n", iommu->name, addr); + + /* root entry dump */ + rt_entry = &iommu->root_entry[bus]; + if (!rt_entry) { + pr_info("root table entry is not present\n"); + return; + } + + if (sm_supported(iommu)) + pr_info("scalable mode root entry: hi 0x%016llx, low 0x%016llx\n", + rt_entry->hi, rt_entry->lo); + else + pr_info("root entry: 0x%016llx", rt_entry->lo); + + /* context entry dump */ + ctx_entry = iommu_context_addr(iommu, bus, devfn, 0); + if (!ctx_entry) { + pr_info("context table entry is not present\n"); + return; + } + + pr_info("context entry: hi 0x%016llx, low 0x%016llx\n", + ctx_entry->hi, ctx_entry->lo); + + /* legacy mode does not require PASID entries */ + if (!sm_supported(iommu)) + goto pgtable_walk; + + /* get the pointer to pasid directory entry */ + dir = phys_to_virt(ctx_entry->lo & VTD_PAGE_MASK); + if (!dir) { + pr_info("pasid directory entry is not present\n"); + return; + } + /* For request-without-pasid, get the pasid from context entry */ + if (intel_iommu_sm && pasid == INVALID_IOASID) + pasid = PASID_RID2PASID; + + dir_index = pasid >> PASID_PDE_SHIFT; + pde = &dir[dir_index]; + pr_info("pasid dir entry: 0x%016llx\n", pde->val); + + /* get the pointer to the pasid table entry */ + entries = get_pasid_table_from_pde(pde); + if (!entries) { + pr_info("pasid table entry is not present\n"); + return; + } + index = pasid & PASID_PTE_MASK; + pte = &entries[index]; + for (i = 0; i < ARRAY_SIZE(pte->val); i++) + pr_info("pasid table entry[%d]: 0x%016llx\n", i, pte->val[i]); + +pgtable_walk: + pgtable_walk(iommu, addr >> VTD_PAGE_SHIFT, bus, devfn); +} +#endif + static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain, unsigned long pfn, int *target_level) { |