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linux/drivers/iommu/intel-iommu-debugfs.c
Lu Baolu bfeaec7f7d iommu/vt-d: Correctly check format of page table in debugfs 
PASID support and enable bit in the context entry isn't the right
indicator for the type of tables (legacy or scalable mode). Check
the DMA_RTADDR_SMT bit in the root context pointer instead.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Sai Praneeth <sai.praneeth.prakhya@intel.com>
Fixes: dd5142ca5d ("iommu/vt-d: Add debugfs support to show scalable mode DMAR table internals")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2019-08-09 17:29:25 +02:00

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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>
#include "intel-pasid.h"
struct tbl_walk {
u16 bus;
u16 devfn;
u32 pasid;
struct root_entry *rt_entry;
struct context_entry *ctx_entry;
struct pasid_entry *pasid_tbl_entry;
};
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 inline void print_tbl_walk(struct seq_file *m)
{
struct tbl_walk *tbl_wlk = m->private;
seq_printf(m, "%02x:%02x.%x\t0x%016llx:0x%016llx\t0x%016llx:0x%016llx\t",
tbl_wlk->bus, PCI_SLOT(tbl_wlk->devfn),
PCI_FUNC(tbl_wlk->devfn), tbl_wlk->rt_entry->hi,
tbl_wlk->rt_entry->lo, tbl_wlk->ctx_entry->hi,
tbl_wlk->ctx_entry->lo);
/*
* A legacy mode DMAR doesn't support PASID, hence default it to -1
* indicating that it's invalid. Also, default all PASID related fields
* to 0.
*/
if (!tbl_wlk->pasid_tbl_entry)
seq_printf(m, "%-6d\t0x%016llx:0x%016llx:0x%016llx\n", -1,
(u64)0, (u64)0, (u64)0);
else
seq_printf(m, "%-6d\t0x%016llx:0x%016llx:0x%016llx\n",
tbl_wlk->pasid, tbl_wlk->pasid_tbl_entry->val[2],
tbl_wlk->pasid_tbl_entry->val[1],
tbl_wlk->pasid_tbl_entry->val[0]);
}
static void pasid_tbl_walk(struct seq_file *m, struct pasid_entry *tbl_entry,
u16 dir_idx)
{
struct tbl_walk *tbl_wlk = m->private;
u8 tbl_idx;
for (tbl_idx = 0; tbl_idx < PASID_TBL_ENTRIES; tbl_idx++) {
if (pasid_pte_is_present(tbl_entry)) {
tbl_wlk->pasid_tbl_entry = tbl_entry;
tbl_wlk->pasid = (dir_idx << PASID_PDE_SHIFT) + tbl_idx;
print_tbl_walk(m);
}
tbl_entry++;
}
}
static void pasid_dir_walk(struct seq_file *m, u64 pasid_dir_ptr,
u16 pasid_dir_size)
{
struct pasid_dir_entry *dir_entry = phys_to_virt(pasid_dir_ptr);
struct pasid_entry *pasid_tbl;
u16 dir_idx;
for (dir_idx = 0; dir_idx < pasid_dir_size; dir_idx++) {
pasid_tbl = get_pasid_table_from_pde(dir_entry);
if (pasid_tbl)
pasid_tbl_walk(m, pasid_tbl, dir_idx);
dir_entry++;
}
}
static void ctx_tbl_walk(struct seq_file *m, struct intel_iommu *iommu, u16 bus)
{
struct context_entry *context;
u16 devfn, pasid_dir_size;
u64 pasid_dir_ptr;
for (devfn = 0; devfn < 256; devfn++) {
struct tbl_walk tbl_wlk = {0};
/*
* Scalable mode root entry points to upper scalable mode
* context table and lower scalable mode context table. Each
* scalable mode context table has 128 context entries where as
* legacy mode context table has 256 context entries. So in
* scalable mode, the context entries for former 128 devices are
* in the lower scalable mode context table, while the latter
* 128 devices are in the upper scalable mode context table.
* In scalable mode, when devfn > 127, iommu_context_addr()
* automatically refers to upper scalable mode context table and
* hence the caller doesn't have to worry about differences
* between scalable mode and non scalable mode.
*/
context = iommu_context_addr(iommu, bus, devfn, 0);
if (!context)
return;
if (!context_present(context))
continue;
tbl_wlk.bus = bus;
tbl_wlk.devfn = devfn;
tbl_wlk.rt_entry = &iommu->root_entry[bus];
tbl_wlk.ctx_entry = context;
m->private = &tbl_wlk;
if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT) {
pasid_dir_ptr = context->lo & VTD_PAGE_MASK;
pasid_dir_size = get_pasid_dir_size(context);
pasid_dir_walk(m, pasid_dir_ptr, pasid_dir_size);
continue;
}
print_tbl_walk(m);
}
}
static void root_tbl_walk(struct seq_file *m, struct intel_iommu *iommu)
{
unsigned long flags;
u16 bus;
spin_lock_irqsave(&iommu->lock, flags);
seq_printf(m, "IOMMU %s: Root Table Address: 0x%llx\n", iommu->name,
(u64)virt_to_phys(iommu->root_entry));
seq_puts(m, "B.D.F\tRoot_entry\t\t\t\tContext_entry\t\t\t\tPASID\tPASID_table_entry\n");
/*
* No need to check if the root entry is present or not because
* iommu_context_addr() performs the same check before returning
* context entry.
*/
for (bus = 0; bus < 256; bus++)
ctx_tbl_walk(m, iommu, bus);
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_walk(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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