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kernel/drivers/iommu/intel-iommu-debugfs.c
Sohil Mehta 18f99c9b9d 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>
2018-09-25 14:33:44 +02:00

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8.4 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright © 2018 Intel Corporation.
*
* Authors: Gayatri Kammela <gayatri.kammela@intel.com>
* Sohil Mehta <sohil.mehta@intel.com>
* Jacob Pan <jacob.jun.pan@linux.intel.com>
*/
#include <linux/debugfs.h>
#include <linux/dmar.h>
#include <linux/intel-iommu.h>
#include <linux/pci.h>
#include <asm/irq_remapping.h>
struct iommu_regset {
int offset;
const char *regs;
};
#define IOMMU_REGSET_ENTRY(_reg_) \
{ DMAR_##_reg_##_REG, __stringify(_reg_) }
static const struct iommu_regset iommu_regs[] = {
IOMMU_REGSET_ENTRY(VER),
IOMMU_REGSET_ENTRY(CAP),
IOMMU_REGSET_ENTRY(ECAP),
IOMMU_REGSET_ENTRY(GCMD),
IOMMU_REGSET_ENTRY(GSTS),
IOMMU_REGSET_ENTRY(RTADDR),
IOMMU_REGSET_ENTRY(CCMD),
IOMMU_REGSET_ENTRY(FSTS),
IOMMU_REGSET_ENTRY(FECTL),
IOMMU_REGSET_ENTRY(FEDATA),
IOMMU_REGSET_ENTRY(FEADDR),
IOMMU_REGSET_ENTRY(FEUADDR),
IOMMU_REGSET_ENTRY(AFLOG),
IOMMU_REGSET_ENTRY(PMEN),
IOMMU_REGSET_ENTRY(PLMBASE),
IOMMU_REGSET_ENTRY(PLMLIMIT),
IOMMU_REGSET_ENTRY(PHMBASE),
IOMMU_REGSET_ENTRY(PHMLIMIT),
IOMMU_REGSET_ENTRY(IQH),
IOMMU_REGSET_ENTRY(IQT),
IOMMU_REGSET_ENTRY(IQA),
IOMMU_REGSET_ENTRY(ICS),
IOMMU_REGSET_ENTRY(IRTA),
IOMMU_REGSET_ENTRY(PQH),
IOMMU_REGSET_ENTRY(PQT),
IOMMU_REGSET_ENTRY(PQA),
IOMMU_REGSET_ENTRY(PRS),
IOMMU_REGSET_ENTRY(PECTL),
IOMMU_REGSET_ENTRY(PEDATA),
IOMMU_REGSET_ENTRY(PEADDR),
IOMMU_REGSET_ENTRY(PEUADDR),
IOMMU_REGSET_ENTRY(MTRRCAP),
IOMMU_REGSET_ENTRY(MTRRDEF),
IOMMU_REGSET_ENTRY(MTRR_FIX64K_00000),
IOMMU_REGSET_ENTRY(MTRR_FIX16K_80000),
IOMMU_REGSET_ENTRY(MTRR_FIX16K_A0000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_C0000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_C8000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_D0000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_D8000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_E0000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_E8000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_F0000),
IOMMU_REGSET_ENTRY(MTRR_FIX4K_F8000),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE0),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK0),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE1),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK1),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE2),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK2),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE3),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK3),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE4),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK4),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE5),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK5),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE6),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK6),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE7),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK7),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE8),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK8),
IOMMU_REGSET_ENTRY(MTRR_PHYSBASE9),
IOMMU_REGSET_ENTRY(MTRR_PHYSMASK9),
IOMMU_REGSET_ENTRY(VCCAP),
IOMMU_REGSET_ENTRY(VCMD),
IOMMU_REGSET_ENTRY(VCRSP),
};
static int iommu_regset_show(struct seq_file *m, void *unused)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
unsigned long flag;
int i, ret = 0;
u64 value;
rcu_read_lock();
for_each_active_iommu(iommu, drhd) {
if (!drhd->reg_base_addr) {
seq_puts(m, "IOMMU: Invalid base address\n");
ret = -EINVAL;
goto out;
}
seq_printf(m, "IOMMU: %s Register Base Address: %llx\n",
iommu->name, drhd->reg_base_addr);
seq_puts(m, "Name\t\t\tOffset\t\tContents\n");
/*
* Publish the contents of the 64-bit hardware registers
* by adding the offset to the pointer (virtual address).
*/
raw_spin_lock_irqsave(&iommu->register_lock, flag);
for (i = 0 ; i < ARRAY_SIZE(iommu_regs); i++) {
value = dmar_readq(iommu->reg + iommu_regs[i].offset);
seq_printf(m, "%-16s\t0x%02x\t\t0x%016llx\n",
iommu_regs[i].regs, iommu_regs[i].offset,
value);
}
raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
seq_putc(m, '\n');
}
out:
rcu_read_unlock();
return ret;
}
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)
{
struct irte *ri_entry;
unsigned long flags;
int idx;
seq_puts(m, " Entry SrcID DstID Vct IRTE_high\t\tIRTE_low\n");
raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
ri_entry = &iommu->ir_table->base[idx];
if (!ri_entry->present || ri_entry->p_pst)
continue;
seq_printf(m, " %-5d %02x:%02x.%01x %08x %02x %016llx\t%016llx\n",
idx, PCI_BUS_NUM(ri_entry->sid),
PCI_SLOT(ri_entry->sid), PCI_FUNC(ri_entry->sid),
ri_entry->dest_id, ri_entry->vector,
ri_entry->high, ri_entry->low);
}
raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
}
static void ir_tbl_posted_entry_show(struct seq_file *m,
struct intel_iommu *iommu)
{
struct irte *pi_entry;
unsigned long flags;
int idx;
seq_puts(m, " Entry SrcID PDA_high PDA_low Vct IRTE_high\t\tIRTE_low\n");
raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
pi_entry = &iommu->ir_table->base[idx];
if (!pi_entry->present || !pi_entry->p_pst)
continue;
seq_printf(m, " %-5d %02x:%02x.%01x %08x %08x %02x %016llx\t%016llx\n",
idx, PCI_BUS_NUM(pi_entry->sid),
PCI_SLOT(pi_entry->sid), PCI_FUNC(pi_entry->sid),
pi_entry->pda_h, pi_entry->pda_l << 6,
pi_entry->vector, pi_entry->high,
pi_entry->low);
}
raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
}
/*
* For active IOMMUs go through the Interrupt remapping
* table and print valid entries in a table format for
* Remapped and Posted Interrupts.
*/
static int ir_translation_struct_show(struct seq_file *m, void *unused)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
u64 irta;
rcu_read_lock();
for_each_active_iommu(iommu, drhd) {
if (!ecap_ir_support(iommu->ecap))
continue;
seq_printf(m, "Remapped Interrupt supported on IOMMU: %s\n",
iommu->name);
if (iommu->ir_table) {
irta = virt_to_phys(iommu->ir_table->base);
seq_printf(m, " IR table address:%llx\n", irta);
ir_tbl_remap_entry_show(m, iommu);
} else {
seq_puts(m, "Interrupt Remapping is not enabled\n");
}
seq_putc(m, '\n');
}
seq_puts(m, "****\n\n");
for_each_active_iommu(iommu, drhd) {
if (!cap_pi_support(iommu->cap))
continue;
seq_printf(m, "Posted Interrupt supported on IOMMU: %s\n",
iommu->name);
if (iommu->ir_table) {
irta = virt_to_phys(iommu->ir_table->base);
seq_printf(m, " IR table address:%llx\n", irta);
ir_tbl_posted_entry_show(m, iommu);
} else {
seq_puts(m, "Interrupt Remapping is not enabled\n");
}
seq_putc(m, '\n');
}
rcu_read_unlock();
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ir_translation_struct);
#endif
void __init intel_iommu_debugfs_init(void)
{
struct dentry *intel_iommu_debug = debugfs_create_dir("intel",
iommu_debugfs_dir);
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);
#endif
}
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