iommu/vt-d: Add debugfs support to show context internals
Export Intel IOMMU DMA remapping internal states, such as root and context table entries in debugfs. Example of such dump in Kabylake: /sys/kernel/debug/iommu/intel/dmar_translation_struct IOMMU dmar0: Root Table Address:45699c000 Root Table Entries: Bus: 0 H: 0 L: 45699f001 Context Table Entries for Bus: 0 Entry B:D.F High Low 16 00:02.0 102 45699e005 IOMMU dmar1: Root Table Address:45699d000 Root Table Entries: Bus: 0 H: 0 L: 45644f001 Context Table Entries for Bus: 0 Entry B:D.F High Low 160 00:14.0 102 45644e001 184 00:17.0 302 456310001 248 00:1f.0 202 4564bf001 Cc: Lu Baolu <baolu.lu@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Co-Developed-by: Gayatri Kammela <gayatri.kammela@intel.com> Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Sohil Mehta <sohil.mehta@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -131,6 +131,69 @@ out:
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}
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DEFINE_SHOW_ATTRIBUTE(iommu_regset);
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static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu,
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int bus)
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{
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struct context_entry *context;
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int devfn;
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seq_printf(m, " Context Table Entries for Bus: %d\n", bus);
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seq_puts(m, " Entry\tB:D.F\tHigh\tLow\n");
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for (devfn = 0; devfn < 256; devfn++) {
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context = iommu_context_addr(iommu, bus, devfn, 0);
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if (!context)
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return;
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if (!context_present(context))
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continue;
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seq_printf(m, " %-5d\t%02x:%02x.%x\t%-6llx\t%llx\n", devfn,
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bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
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context[0].hi, context[0].lo);
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}
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}
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static void root_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu)
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{
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unsigned long flags;
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int bus;
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spin_lock_irqsave(&iommu->lock, flags);
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seq_printf(m, "IOMMU %s: Root Table Address:%llx\n", iommu->name,
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(u64)virt_to_phys(iommu->root_entry));
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seq_puts(m, "Root Table Entries:\n");
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for (bus = 0; bus < 256; bus++) {
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if (!(iommu->root_entry[bus].lo & 1))
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continue;
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seq_printf(m, " Bus: %d H: %llx L: %llx\n", bus,
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iommu->root_entry[bus].hi,
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iommu->root_entry[bus].lo);
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ctx_tbl_entry_show(m, iommu, bus);
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seq_putc(m, '\n');
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}
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spin_unlock_irqrestore(&iommu->lock, flags);
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}
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static int dmar_translation_struct_show(struct seq_file *m, void *unused)
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{
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struct dmar_drhd_unit *drhd;
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struct intel_iommu *iommu;
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rcu_read_lock();
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for_each_active_iommu(iommu, drhd) {
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root_tbl_entry_show(m, iommu);
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seq_putc(m, '\n');
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}
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rcu_read_unlock();
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(dmar_translation_struct);
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#ifdef CONFIG_IRQ_REMAP
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static void ir_tbl_remap_entry_show(struct seq_file *m,
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struct intel_iommu *iommu)
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@ -242,6 +305,8 @@ void __init intel_iommu_debugfs_init(void)
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debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL,
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&iommu_regset_fops);
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debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug,
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NULL, &dmar_translation_struct_fops);
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#ifdef CONFIG_IRQ_REMAP
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debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug,
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NULL, &ir_translation_struct_fops);
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