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Commit 18f99c9b authored by Sohil Mehta's avatar Sohil Mehta Committed by Joerg Roedel
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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: default avatarGayatri Kammela <gayatri.kammela@intel.com>
Signed-off-by: default avatarGayatri Kammela <gayatri.kammela@intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarSohil Mehta <sohil.mehta@intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent a6d268c6

drivers/iommu/intel-iommu-debugfs.c

+65 −0
Original line number Diff line number Diff line
@@ -131,6 +131,69 @@ static int iommu_regset_show(struct seq_file *m, void *unused) 
}

DEFINE_SHOW_ATTRIBUTE(iommu_regset);



static void ctx_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu,

			       int bus)

{

	struct context_entry *context;

	int devfn;



	seq_printf(m, " Context Table Entries for Bus: %d\n", bus);

	seq_puts(m, "  Entry\tB:D.F\tHigh\tLow\n");



	for (devfn = 0; devfn < 256; devfn++) {

		context = iommu_context_addr(iommu, bus, devfn, 0);

		if (!context)

			return;



		if (!context_present(context))

			continue;



		seq_printf(m, "  %-5d\t%02x:%02x.%x\t%-6llx\t%llx\n", devfn,

			   bus, PCI_SLOT(devfn), PCI_FUNC(devfn),

			   context[0].hi, context[0].lo);

	}

}



static void root_tbl_entry_show(struct seq_file *m, struct intel_iommu *iommu)

{

	unsigned long flags;

	int bus;



	spin_lock_irqsave(&iommu->lock, flags);

	seq_printf(m, "IOMMU %s: Root Table Address:%llx\n", iommu->name,

		   (u64)virt_to_phys(iommu->root_entry));

	seq_puts(m, "Root Table Entries:\n");



	for (bus = 0; bus < 256; bus++) {

		if (!(iommu->root_entry[bus].lo & 1))

			continue;



		seq_printf(m, " Bus: %d H: %llx L: %llx\n", bus,

			   iommu->root_entry[bus].hi,

			   iommu->root_entry[bus].lo);



		ctx_tbl_entry_show(m, iommu, bus);

		seq_putc(m, '\n');

	}

	spin_unlock_irqrestore(&iommu->lock, flags);

}



static int dmar_translation_struct_show(struct seq_file *m, void *unused)

{

	struct dmar_drhd_unit *drhd;

	struct intel_iommu *iommu;



	rcu_read_lock();

	for_each_active_iommu(iommu, drhd) {

		root_tbl_entry_show(m, iommu);

		seq_putc(m, '\n');

	}

	rcu_read_unlock();



	return 0;

}

DEFINE_SHOW_ATTRIBUTE(dmar_translation_struct);



#ifdef CONFIG_IRQ_REMAP

static void ir_tbl_remap_entry_show(struct seq_file *m,

				    struct intel_iommu *iommu)
@@ -242,6 +305,8 @@ void __init intel_iommu_debugfs_init(void) 


	debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL,

			    &iommu_regset_fops);

	debugfs_create_file("dmar_translation_struct", 0444, intel_iommu_debug,

			    NULL, &dmar_translation_struct_fops);

#ifdef CONFIG_IRQ_REMAP

	debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug,

			    NULL, &ir_translation_struct_fops);