diff options
Diffstat (limited to 'drivers/iommu/intel-iommu-debugfs.c')
| -rw-r--r-- | drivers/iommu/intel-iommu-debugfs.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu-debugfs.c b/drivers/iommu/intel-iommu-debugfs.c index 471f05d452e0..c1257bef553c 100644 --- a/drivers/iommu/intel-iommu-debugfs.c +++ b/drivers/iommu/intel-iommu-debugfs.c @@ -5,6 +5,7 @@ * Authors: Gayatri Kammela <gayatri.kammela@intel.com> * Sohil Mehta <sohil.mehta@intel.com> * Jacob Pan <jacob.jun.pan@linux.intel.com> + * Lu Baolu <baolu.lu@linux.intel.com> */ #include <linux/debugfs.h> @@ -283,6 +284,77 @@ static int dmar_translation_struct_show(struct seq_file *m, void *unused) } DEFINE_SHOW_ATTRIBUTE(dmar_translation_struct); +static inline unsigned long level_to_directory_size(int level) +{ + return BIT_ULL(VTD_PAGE_SHIFT + VTD_STRIDE_SHIFT * (level - 1)); +} + +static inline void +dump_page_info(struct seq_file *m, unsigned long iova, u64 *path) +{ + seq_printf(m, "0x%013lx |\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\t0x%016llx\n", + iova >> VTD_PAGE_SHIFT, path[5], path[4], + path[3], path[2], path[1]); +} + +static void pgtable_walk_level(struct seq_file *m, struct dma_pte *pde, + int level, unsigned long start, + u64 *path) +{ + int i; + + if (level > 5 || level < 1) + return; + + for (i = 0; i < BIT_ULL(VTD_STRIDE_SHIFT); + i++, pde++, start += level_to_directory_size(level)) { + if (!dma_pte_present(pde)) + continue; + + path[level] = pde->val; + if (dma_pte_superpage(pde) || level == 1) + dump_page_info(m, start, path); + else + pgtable_walk_level(m, phys_to_virt(dma_pte_addr(pde)), + level - 1, start, path); + path[level] = 0; + } +} + +static int show_device_domain_translation(struct device *dev, void *data) +{ + struct dmar_domain *domain = find_domain(dev); + struct seq_file *m = data; + u64 path[6] = { 0 }; + + if (!domain) + return 0; + + seq_printf(m, "Device %s with pasid %d @0x%llx\n", + dev_name(dev), domain->default_pasid, + (u64)virt_to_phys(domain->pgd)); + seq_puts(m, "IOVA_PFN\t\tPML5E\t\t\tPML4E\t\t\tPDPE\t\t\tPDE\t\t\tPTE\n"); + + pgtable_walk_level(m, domain->pgd, domain->agaw + 2, 0, path); + seq_putc(m, '\n'); + + return 0; +} + +static int domain_translation_struct_show(struct seq_file *m, void *unused) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&device_domain_lock, flags); + ret = bus_for_each_dev(&pci_bus_type, NULL, m, + show_device_domain_translation); + spin_unlock_irqrestore(&device_domain_lock, flags); + + return ret; +} +DEFINE_SHOW_ATTRIBUTE(domain_translation_struct); + #ifdef CONFIG_IRQ_REMAP static void ir_tbl_remap_entry_show(struct seq_file *m, struct intel_iommu *iommu) @@ -396,6 +468,9 @@ void __init intel_iommu_debugfs_init(void) &iommu_regset_fops); debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug, NULL, &dmar_translation_struct_fops); + debugfs_create_file("domain_translation_struct", 0444, + intel_iommu_debug, NULL, + &domain_translation_struct_fops); #ifdef CONFIG_IRQ_REMAP debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug, NULL, &ir_translation_struct_fops); |