423 lines
12 KiB
C
423 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright © 2018 Intel Corporation.
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*
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* Authors: Gayatri Kammela <gayatri.kammela@intel.com>
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* Sohil Mehta <sohil.mehta@intel.com>
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* Jacob Pan <jacob.jun.pan@linux.intel.com>
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*/
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#include <linux/debugfs.h>
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#include <linux/dmar.h>
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#include <linux/intel-iommu.h>
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#include <linux/pci.h>
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#include <asm/irq_remapping.h>
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#include "intel-pasid.h"
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struct tbl_walk {
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u16 bus;
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u16 devfn;
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u32 pasid;
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struct root_entry *rt_entry;
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struct context_entry *ctx_entry;
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struct pasid_entry *pasid_tbl_entry;
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};
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struct iommu_regset {
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int offset;
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const char *regs;
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};
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#define IOMMU_REGSET_ENTRY(_reg_) \
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{ DMAR_##_reg_##_REG, __stringify(_reg_) }
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static const struct iommu_regset iommu_regs_32[] = {
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IOMMU_REGSET_ENTRY(VER),
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IOMMU_REGSET_ENTRY(GCMD),
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IOMMU_REGSET_ENTRY(GSTS),
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IOMMU_REGSET_ENTRY(FSTS),
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IOMMU_REGSET_ENTRY(FECTL),
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IOMMU_REGSET_ENTRY(FEDATA),
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IOMMU_REGSET_ENTRY(FEADDR),
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IOMMU_REGSET_ENTRY(FEUADDR),
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IOMMU_REGSET_ENTRY(PMEN),
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IOMMU_REGSET_ENTRY(PLMBASE),
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IOMMU_REGSET_ENTRY(PLMLIMIT),
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IOMMU_REGSET_ENTRY(ICS),
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IOMMU_REGSET_ENTRY(PRS),
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IOMMU_REGSET_ENTRY(PECTL),
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IOMMU_REGSET_ENTRY(PEDATA),
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IOMMU_REGSET_ENTRY(PEADDR),
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IOMMU_REGSET_ENTRY(PEUADDR),
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};
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static const struct iommu_regset iommu_regs_64[] = {
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IOMMU_REGSET_ENTRY(CAP),
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IOMMU_REGSET_ENTRY(ECAP),
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IOMMU_REGSET_ENTRY(RTADDR),
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IOMMU_REGSET_ENTRY(CCMD),
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IOMMU_REGSET_ENTRY(AFLOG),
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IOMMU_REGSET_ENTRY(PHMBASE),
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IOMMU_REGSET_ENTRY(PHMLIMIT),
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IOMMU_REGSET_ENTRY(IQH),
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IOMMU_REGSET_ENTRY(IQT),
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IOMMU_REGSET_ENTRY(IQA),
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IOMMU_REGSET_ENTRY(IRTA),
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IOMMU_REGSET_ENTRY(PQH),
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IOMMU_REGSET_ENTRY(PQT),
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IOMMU_REGSET_ENTRY(PQA),
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IOMMU_REGSET_ENTRY(MTRRCAP),
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IOMMU_REGSET_ENTRY(MTRRDEF),
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IOMMU_REGSET_ENTRY(MTRR_FIX64K_00000),
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IOMMU_REGSET_ENTRY(MTRR_FIX16K_80000),
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IOMMU_REGSET_ENTRY(MTRR_FIX16K_A0000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_C0000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_C8000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_D0000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_D8000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_E0000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_E8000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_F0000),
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IOMMU_REGSET_ENTRY(MTRR_FIX4K_F8000),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE0),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK0),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE1),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK1),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE2),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK2),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE3),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK3),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE4),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK4),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE5),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK5),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE6),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK6),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE7),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK7),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE8),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK8),
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IOMMU_REGSET_ENTRY(MTRR_PHYSBASE9),
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IOMMU_REGSET_ENTRY(MTRR_PHYSMASK9),
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IOMMU_REGSET_ENTRY(VCCAP),
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IOMMU_REGSET_ENTRY(VCMD),
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IOMMU_REGSET_ENTRY(VCRSP),
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};
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static int iommu_regset_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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unsigned long flag;
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int i, ret = 0;
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u64 value;
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rcu_read_lock();
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for_each_active_iommu(iommu, drhd) {
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if (!drhd->reg_base_addr) {
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seq_puts(m, "IOMMU: Invalid base address\n");
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ret = -EINVAL;
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goto out;
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}
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seq_printf(m, "IOMMU: %s Register Base Address: %llx\n",
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iommu->name, drhd->reg_base_addr);
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seq_puts(m, "Name\t\t\tOffset\t\tContents\n");
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/*
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* Publish the contents of the 64-bit hardware registers
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* by adding the offset to the pointer (virtual address).
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*/
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raw_spin_lock_irqsave(&iommu->register_lock, flag);
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for (i = 0 ; i < ARRAY_SIZE(iommu_regs_32); i++) {
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value = dmar_readl(iommu->reg + iommu_regs_32[i].offset);
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seq_printf(m, "%-16s\t0x%02x\t\t0x%016llx\n",
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iommu_regs_32[i].regs, iommu_regs_32[i].offset,
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value);
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}
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for (i = 0 ; i < ARRAY_SIZE(iommu_regs_64); i++) {
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value = dmar_readq(iommu->reg + iommu_regs_64[i].offset);
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seq_printf(m, "%-16s\t0x%02x\t\t0x%016llx\n",
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iommu_regs_64[i].regs, iommu_regs_64[i].offset,
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value);
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}
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raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
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seq_putc(m, '\n');
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}
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out:
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rcu_read_unlock();
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return ret;
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}
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DEFINE_SHOW_ATTRIBUTE(iommu_regset);
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static inline void print_tbl_walk(struct seq_file *m)
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{
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struct tbl_walk *tbl_wlk = m->private;
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seq_printf(m, "%02x:%02x.%x\t0x%016llx:0x%016llx\t0x%016llx:0x%016llx\t",
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tbl_wlk->bus, PCI_SLOT(tbl_wlk->devfn),
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PCI_FUNC(tbl_wlk->devfn), tbl_wlk->rt_entry->hi,
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tbl_wlk->rt_entry->lo, tbl_wlk->ctx_entry->hi,
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tbl_wlk->ctx_entry->lo);
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/*
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* A legacy mode DMAR doesn't support PASID, hence default it to -1
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* indicating that it's invalid. Also, default all PASID related fields
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* to 0.
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*/
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if (!tbl_wlk->pasid_tbl_entry)
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seq_printf(m, "%-6d\t0x%016llx:0x%016llx:0x%016llx\n", -1,
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(u64)0, (u64)0, (u64)0);
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else
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seq_printf(m, "%-6d\t0x%016llx:0x%016llx:0x%016llx\n",
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tbl_wlk->pasid, tbl_wlk->pasid_tbl_entry->val[2],
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tbl_wlk->pasid_tbl_entry->val[1],
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tbl_wlk->pasid_tbl_entry->val[0]);
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}
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static void pasid_tbl_walk(struct seq_file *m, struct pasid_entry *tbl_entry,
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u16 dir_idx)
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{
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struct tbl_walk *tbl_wlk = m->private;
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u8 tbl_idx;
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for (tbl_idx = 0; tbl_idx < PASID_TBL_ENTRIES; tbl_idx++) {
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if (pasid_pte_is_present(tbl_entry)) {
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tbl_wlk->pasid_tbl_entry = tbl_entry;
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tbl_wlk->pasid = (dir_idx << PASID_PDE_SHIFT) + tbl_idx;
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print_tbl_walk(m);
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}
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tbl_entry++;
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}
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}
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static void pasid_dir_walk(struct seq_file *m, u64 pasid_dir_ptr,
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u16 pasid_dir_size)
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{
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struct pasid_dir_entry *dir_entry = phys_to_virt(pasid_dir_ptr);
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struct pasid_entry *pasid_tbl;
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u16 dir_idx;
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for (dir_idx = 0; dir_idx < pasid_dir_size; dir_idx++) {
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pasid_tbl = get_pasid_table_from_pde(dir_entry);
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if (pasid_tbl)
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pasid_tbl_walk(m, pasid_tbl, dir_idx);
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dir_entry++;
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}
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}
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static void ctx_tbl_walk(struct seq_file *m, struct intel_iommu *iommu, u16 bus)
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{
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struct context_entry *context;
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u16 devfn, pasid_dir_size;
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u64 pasid_dir_ptr;
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for (devfn = 0; devfn < 256; devfn++) {
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struct tbl_walk tbl_wlk = {0};
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/*
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* Scalable mode root entry points to upper scalable mode
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* context table and lower scalable mode context table. Each
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* scalable mode context table has 128 context entries where as
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* legacy mode context table has 256 context entries. So in
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* scalable mode, the context entries for former 128 devices are
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* in the lower scalable mode context table, while the latter
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* 128 devices are in the upper scalable mode context table.
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* In scalable mode, when devfn > 127, iommu_context_addr()
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* automatically refers to upper scalable mode context table and
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* hence the caller doesn't have to worry about differences
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* between scalable mode and non scalable mode.
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*/
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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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tbl_wlk.bus = bus;
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tbl_wlk.devfn = devfn;
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tbl_wlk.rt_entry = &iommu->root_entry[bus];
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tbl_wlk.ctx_entry = context;
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m->private = &tbl_wlk;
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if (dmar_readq(iommu->reg + DMAR_RTADDR_REG) & DMA_RTADDR_SMT) {
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pasid_dir_ptr = context->lo & VTD_PAGE_MASK;
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pasid_dir_size = get_pasid_dir_size(context);
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pasid_dir_walk(m, pasid_dir_ptr, pasid_dir_size);
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continue;
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}
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print_tbl_walk(m);
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}
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}
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static void root_tbl_walk(struct seq_file *m, struct intel_iommu *iommu)
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{
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unsigned long flags;
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u16 bus;
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spin_lock_irqsave(&iommu->lock, flags);
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seq_printf(m, "IOMMU %s: Root Table Address: 0x%llx\n", iommu->name,
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(u64)virt_to_phys(iommu->root_entry));
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seq_puts(m, "B.D.F\tRoot_entry\t\t\t\tContext_entry\t\t\t\tPASID\tPASID_table_entry\n");
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/*
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* No need to check if the root entry is present or not because
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* iommu_context_addr() performs the same check before returning
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* context entry.
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*/
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for (bus = 0; bus < 256; bus++)
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ctx_tbl_walk(m, iommu, bus);
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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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u32 sts;
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rcu_read_lock();
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for_each_active_iommu(iommu, drhd) {
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sts = dmar_readl(iommu->reg + DMAR_GSTS_REG);
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if (!(sts & DMA_GSTS_TES)) {
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seq_printf(m, "DMA Remapping is not enabled on %s\n",
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iommu->name);
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continue;
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}
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root_tbl_walk(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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{
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struct irte *ri_entry;
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unsigned long flags;
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int idx;
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seq_puts(m, " Entry SrcID DstID Vct IRTE_high\t\tIRTE_low\n");
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
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ri_entry = &iommu->ir_table->base[idx];
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if (!ri_entry->present || ri_entry->p_pst)
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continue;
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seq_printf(m, " %-5d %02x:%02x.%01x %08x %02x %016llx\t%016llx\n",
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idx, PCI_BUS_NUM(ri_entry->sid),
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PCI_SLOT(ri_entry->sid), PCI_FUNC(ri_entry->sid),
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ri_entry->dest_id, ri_entry->vector,
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ri_entry->high, ri_entry->low);
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}
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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}
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static void ir_tbl_posted_entry_show(struct seq_file *m,
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struct intel_iommu *iommu)
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{
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struct irte *pi_entry;
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unsigned long flags;
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int idx;
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seq_puts(m, " Entry SrcID PDA_high PDA_low Vct IRTE_high\t\tIRTE_low\n");
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) {
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pi_entry = &iommu->ir_table->base[idx];
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if (!pi_entry->present || !pi_entry->p_pst)
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continue;
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seq_printf(m, " %-5d %02x:%02x.%01x %08x %08x %02x %016llx\t%016llx\n",
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idx, PCI_BUS_NUM(pi_entry->sid),
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PCI_SLOT(pi_entry->sid), PCI_FUNC(pi_entry->sid),
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pi_entry->pda_h, pi_entry->pda_l << 6,
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pi_entry->vector, pi_entry->high,
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pi_entry->low);
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}
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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}
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/*
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* For active IOMMUs go through the Interrupt remapping
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* table and print valid entries in a table format for
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* Remapped and Posted Interrupts.
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*/
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static int ir_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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u64 irta;
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u32 sts;
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rcu_read_lock();
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for_each_active_iommu(iommu, drhd) {
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if (!ecap_ir_support(iommu->ecap))
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continue;
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seq_printf(m, "Remapped Interrupt supported on IOMMU: %s\n",
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iommu->name);
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sts = dmar_readl(iommu->reg + DMAR_GSTS_REG);
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if (iommu->ir_table && (sts & DMA_GSTS_IRES)) {
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irta = virt_to_phys(iommu->ir_table->base);
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seq_printf(m, " IR table address:%llx\n", irta);
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ir_tbl_remap_entry_show(m, iommu);
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} else {
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seq_puts(m, "Interrupt Remapping is not enabled\n");
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}
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seq_putc(m, '\n');
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}
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seq_puts(m, "****\n\n");
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for_each_active_iommu(iommu, drhd) {
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if (!cap_pi_support(iommu->cap))
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continue;
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seq_printf(m, "Posted Interrupt supported on IOMMU: %s\n",
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iommu->name);
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if (iommu->ir_table) {
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irta = virt_to_phys(iommu->ir_table->base);
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seq_printf(m, " IR table address:%llx\n", irta);
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ir_tbl_posted_entry_show(m, iommu);
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} else {
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seq_puts(m, "Interrupt Remapping is not enabled\n");
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}
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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(ir_translation_struct);
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#endif
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void __init intel_iommu_debugfs_init(void)
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{
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struct dentry *intel_iommu_debug = debugfs_create_dir("intel",
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iommu_debugfs_dir);
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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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#endif
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}
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