/*
* Copyright (C) 2014-2016 Broadcom Corporation
* Copyright (c) 2017 Red Hat, Inc.
* Written by Prem Mallappa, Eric Auger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Author: Prem Mallappa <pmallapp@broadcom.com>
*
*/
#include "qemu/osdep.h"
#include "sysemu/sysemu.h"
#include "exec/address-spaces.h"
#include "trace.h"
#include "exec/target_page.h"
#include "qom/cpu.h"
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/arm/smmu-common.h"
#include "smmu-internal.h"
/* VMSAv8-64 Translation */
/**
* get_pte - Get the content of a page table entry located at
* @base_addr[@index]
*/
static int get_pte(dma_addr_t baseaddr, uint32_t index, uint64_t *pte,
SMMUPTWEventInfo *info)
{
int ret;
dma_addr_t addr = baseaddr + index * sizeof(*pte);
/* TODO: guarantee 64-bit single-copy atomicity */
ret = dma_memory_read(&address_space_memory, addr,
(uint8_t *)pte, sizeof(*pte));
if (ret != MEMTX_OK) {
info->type = SMMU_PTW_ERR_WALK_EABT;
info->addr = addr;
return -EINVAL;
}
trace_smmu_get_pte(baseaddr, index, addr, *pte);
return 0;
}
/* VMSAv8-64 Translation Table Format Descriptor Decoding */
/**
* get_page_pte_address - returns the L3 descriptor output address,
* ie. the page frame
* ARM ARM spec: Figure D4-17 VMSAv8-64 level 3 descriptor format
*/
static inline hwaddr get_page_pte_address(uint64_t pte, int granule_sz)
{
return PTE_ADDRESS(pte, granule_sz);
}
/**
* get_table_pte_address - return table descriptor output address,
* ie. address of next level table
* ARM ARM Figure D4-16 VMSAv8-64 level0, level1, and level 2 descriptor formats
*/
static inline hwaddr get_table_pte_address(uint64_t pte, int granule_sz)
{
return PTE_ADDRESS(pte, granule_sz);
}
/**
* get_block_pte_address - return block descriptor output address and block size
* ARM ARM Figure D4-16 VMSAv8-64 level0, level1, and level 2 descriptor formats
*/
static inline hwaddr get_block_pte_address(uint64_t pte, int level,
int granule_sz, uint64_t *bsz)
{
int n = level_shift(level, granule_sz);
*bsz = 1ULL << n;
return PTE_ADDRESS(pte, n);
}
SMMUTransTableInfo *select_tt(SMMUTransCfg *cfg, dma_addr_t iova)
{
bool tbi = extract64(iova, 55, 1) ? TBI1(cfg->tbi) : TBI0(cfg->tbi);
uint8_t tbi_byte = tbi * 8;
if (cfg->tt[0].tsz &&
!extract64(iova, 64 - cfg->tt[0].tsz, cfg->tt[0].tsz - tbi_byte)) {
/* there is a ttbr0 region and we are in it (high bits all zero) */
return &cfg->tt[0];
} else if (cfg->tt[1].tsz &&
!extract64(iova, 64 - cfg->tt[1].tsz, cfg->tt[1].tsz - tbi_byte)) {
/* there is a ttbr1 region and we are in it (high bits all one) */
return &cfg->tt[1];
} else if (!cfg->tt[0].tsz) {
/* ttbr0 region is "everything not in the ttbr1 region" */
return &cfg->tt[0];
} else if (!cfg->tt[1].tsz) {
/* ttbr1 region is "everything not in the ttbr0 region" */
return &cfg->tt[1];
}
/* in the gap between the two regions, this is a Translation fault */
return NULL;
}
/**
* smmu_ptw_64 - VMSAv8-64 Walk of the page tables for a given IOVA
* @cfg: translation config
* @iova: iova to translate
* @perm: access type
* @tlbe: IOMMUTLBEntry (out)
* @info: handle to an error info
*
* Return 0 on success, < 0 on error. In case of error, @info is filled
* and tlbe->perm is set to IOMMU_NONE.
* Upon success, @tlbe is filled with translated_addr and entry
* permission rights.
*/
static int smmu_ptw_64(SMMUTransCfg *cfg,
dma_addr_t iova, IOMMUAccessFlags perm,
IOMMUTLBEntry *tlbe, SMMUPTWEventInfo *info)
{
dma_addr_t baseaddr, indexmask;
int stage = cfg->stage;
SMMUTransTableInfo *tt = select_tt(cfg, iova);
uint8_t level, granule_sz, inputsize, stride;
if (!tt || tt->disabled) {
info->type = SMMU_PTW_ERR_TRANSLATION;
goto error;
}
granule_sz = tt->granule_sz;
stride = granule_sz - 3;
inputsize = 64 - tt->tsz;
level = 4 - (inputsize - 4) / stride;
indexmask = (1ULL << (inputsize - (stride * (4 - level)))) - 1;
baseaddr = extract64(tt->ttb, 0, 48);
baseaddr &= ~indexmask;
tlbe->iova = iova;
tlbe->addr_mask = (1 << granule_sz) - 1;
while (level <= 3) {
uint64_t subpage_size = 1ULL << level_shift(level, granule_sz);
uint64_t mask = subpage_size - 1;
uint32_t offset = iova_level_offset(iova, inputsize, level, granule_sz);
uint64_t pte;
dma_addr_t pte_addr = baseaddr + offset * sizeof(pte);
uint8_t ap;
if (get_pte(baseaddr, offset, &pte, info)) {
goto error;
}
trace_smmu_ptw_level(level, iova, subpage_size,
baseaddr, offset, pte);
if (is_invalid_pte(pte) || is_reserved_pte(pte, level)) {
trace_smmu_ptw_invalid_pte(stage, level, baseaddr,
pte_addr, offset, pte);
info->type = SMMU_PTW_ERR_TRANSLATION;
goto error;
}
if (is_page_pte(pte, level)) {
uint64_t gpa = get_page_pte_address(pte, granule_sz);
ap = PTE_AP(pte);
if (is_permission_fault(ap, perm)) {
info->type = SMMU_PTW_ERR_PERMISSION;
goto error;
}
tlbe->translated_addr = gpa + (iova & mask);
tlbe->perm = PTE_AP_TO_PERM(ap);
trace_smmu_ptw_page_pte(stage, level, iova,
baseaddr, pte_addr, pte, gpa);
return 0;
}
if (is_block_pte(pte, level)) {
uint64_t block_size;
hwaddr gpa = get_block_pte_address(pte, level, granule_sz,
&block_size);
ap = PTE_AP(pte);
if (is_permission_fault(ap, perm)) {
info->type = SMMU_PTW_ERR_PERMISSION;
goto error;
}
trace_smmu_ptw_block_pte(stage, level, baseaddr,
pte_addr, pte, iova, gpa,
block_size >> 20);
tlbe->translated_addr = gpa + (iova & mask);
tlbe->perm = PTE_AP_TO_PERM(ap);
return 0;
}
/* table pte */
ap = PTE_APTABLE(pte);
if (is_permission_fault(ap, perm)) {
info->type = SMMU_PTW_ERR_PERMISSION;
goto error;
}
baseaddr = get_table_pte_address(pte, granule_sz);
level++;
}
info->type = SMMU_PTW_ERR_TRANSLATION;
error:
tlbe->perm = IOMMU_NONE;
return -EINVAL;
}
/**
* smmu_ptw - Walk the page tables for an IOVA, according to @cfg
*
* @cfg: translation configuration
* @iova: iova to translate
* @perm: tentative access type
* @tlbe: returned entry
* @info: ptw event handle
*
* return 0 on success
*/
inline int smmu_ptw(SMMUTransCfg *cfg, dma_addr_t iova, IOMMUAccessFlags perm,
IOMMUTLBEntry *tlbe, SMMUPTWEventInfo *info)
{
if (!cfg->aa64) {
/*
* This code path is not entered as we check this while decoding
* the configuration data in the derived SMMU model.
*/
g_assert_not_reached();
}
return smmu_ptw_64(cfg, iova, perm, tlbe, info);
}
/**
* The bus number is used for lookup when SID based invalidation occurs.
* In that case we lazily populate the SMMUPciBus array from the bus hash
* table. At the time the SMMUPciBus is created (smmu_find_add_as), the bus
* numbers may not be always initialized yet.
*/
SMMUPciBus *smmu_find_smmu_pcibus(SMMUState *s, uint8_t bus_num)
{
SMMUPciBus *smmu_pci_bus = s->smmu_pcibus_by_bus_num[bus_num];
if (!smmu_pci_bus) {
GHashTableIter iter;
g_hash_table_iter_init(&iter, s->smmu_pcibus_by_busptr);
while (g_hash_table_iter_next(&iter, NULL, (void **)&smmu_pci_bus)) {
if (pci_bus_num(smmu_pci_bus->bus) == bus_num) {
s->smmu_pcibus_by_bus_num[bus_num] = smmu_pci_bus;
return smmu_pci_bus;
}
}
}
return smmu_pci_bus;
}
static AddressSpace *smmu_find_add_as(PCIBus *bus, void *opaque, int devfn)
{
SMMUState *s = opaque;
SMMUPciBus *sbus = g_hash_table_lookup(s->smmu_pcibus_by_busptr, bus);
SMMUDevice *sdev;
if (!sbus) {
sbus = g_malloc0(sizeof(SMMUPciBus) +
sizeof(SMMUDevice *) * SMMU_PCI_DEVFN_MAX);
sbus->bus = bus;
g_hash_table_insert(s->smmu_pcibus_by_busptr, bus, sbus);
}
sdev = sbus->pbdev[devfn];
if (!sdev) {
char *name = g_strdup_printf("%s-%d-%d",
s->mrtypename,
pci_bus_num(bus), devfn);
sdev = sbus->pbdev[devfn] = g_new0(SMMUDevice, 1);
sdev->smmu = s;
sdev->bus = bus;
sdev->devfn = devfn;
memory_region_init_iommu(&sdev->iommu, sizeof(sdev->iommu),
s->mrtypename,
OBJECT(s), name, 1ULL << SMMU_MAX_VA_BITS);
address_space_init(&sdev->as,
MEMORY_REGION(&sdev->iommu), name);
trace_smmu_add_mr(name);
g_free(name);
}
return &sdev->as;
}
IOMMUMemoryRegion *smmu_iommu_mr(SMMUState *s, uint32_t sid)
{
uint8_t bus_n, devfn;
SMMUPciBus *smmu_bus;
SMMUDevice *smmu;
bus_n = PCI_BUS_NUM(sid);
smmu_bus = smmu_find_smmu_pcibus(s, bus_n);
if (smmu_bus) {
devfn = sid & 0x7;
smmu = smmu_bus->pbdev[devfn];
if (smmu) {
return &smmu->iommu;
}
}
return NULL;
}
static void smmu_base_realize(DeviceState *dev, Error **errp)
{
SMMUState *s = ARM_SMMU(dev);
SMMUBaseClass *sbc = ARM_SMMU_GET_CLASS(dev);
Error *local_err = NULL;
sbc->parent_realize(dev, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
s->configs = g_hash_table_new_full(NULL, NULL, NULL, g_free);
s->smmu_pcibus_by_busptr = g_hash_table_new(NULL, NULL);
if (s->primary_bus) {
pci_setup_iommu(s->primary_bus, smmu_find_add_as, s);
} else {
error_setg(errp, "SMMU is not attached to any PCI bus!");
}
}
static void smmu_base_reset(DeviceState *dev)
{
SMMUState *s = ARM_SMMU(dev);
g_hash_table_remove_all(s->configs);
}
static Property smmu_dev_properties[] = {
DEFINE_PROP_UINT8("bus_num", SMMUState, bus_num, 0),
DEFINE_PROP_LINK("primary-bus", SMMUState, primary_bus, "PCI", PCIBus *),
DEFINE_PROP_END_OF_LIST(),
};
static void smmu_base_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SMMUBaseClass *sbc = ARM_SMMU_CLASS(klass);
dc->props = smmu_dev_properties;
device_class_set_parent_realize(dc, smmu_base_realize,
&sbc->parent_realize);
dc->reset = smmu_base_reset;
}
static const TypeInfo smmu_base_info = {
.name = TYPE_ARM_SMMU,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(SMMUState),
.class_data = NULL,
.class_size = sizeof(SMMUBaseClass),
.class_init = smmu_base_class_init,
.abstract = true,
};
static void smmu_base_register_types(void)
{
type_register_static(&smmu_base_info);
}
type_init(smmu_base_register_types)
