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acrn-hypervisor/hypervisor/arch/x86/vtd.c
Shuo A Liu e8ac97671f hv: use asm_pause() to replace inline ASM to satisfy MISRAC 
pause_cpu() --> asm_pause()
hlt_cpu() --> asm_hlt()
inline ASM pause --> asm_pause()

Tracked-On: #1821
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
2018-12-27 12:35:40 +08:00

1145 lines
33 KiB
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/*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#define pr_prefix "iommu: "
#include <hypervisor.h>
#define DBG_IOMMU 0
#if DBG_IOMMU
#define ACRN_DBG_IOMMU LOG_INFO
#define DMAR_FAULT_LOOP_MAX 10
#else
#define ACRN_DBG_IOMMU 6U
#endif
#define LEVEL_WIDTH 9U
#define ROOT_ENTRY_LOWER_PRESENT_POS (0U)
#define ROOT_ENTRY_LOWER_PRESENT_MASK (1UL)
#define ROOT_ENTRY_LOWER_CTP_POS (12U)
#define ROOT_ENTRY_LOWER_CTP_MASK (0xFFFFFFFFFFFFFUL)
/* 4 iommu fault register state */
#define IOMMU_FAULT_REGISTER_STATE_NUM 4U
#define IOMMU_FAULT_REGISTER_SIZE 4U
#define CTX_ENTRY_UPPER_AW_POS (0U)
#define CTX_ENTRY_UPPER_AW_MASK (0x7UL << CTX_ENTRY_UPPER_AW_POS)
#define CTX_ENTRY_UPPER_DID_POS (8U)
#define CTX_ENTRY_UPPER_DID_MASK (0x3FUL << CTX_ENTRY_UPPER_DID_POS)
#define CTX_ENTRY_LOWER_P_POS (0U)
#define CTX_ENTRY_LOWER_P_MASK (0x1UL << CTX_ENTRY_LOWER_P_POS)
#define CTX_ENTRY_LOWER_FPD_POS (1U)
#define CTX_ENTRY_LOWER_FPD_MASK (0x1UL << CTX_ENTRY_LOWER_FPD_POS)
#define CTX_ENTRY_LOWER_TT_POS (2U)
#define CTX_ENTRY_LOWER_TT_MASK (0x3UL << CTX_ENTRY_LOWER_TT_POS)
#define CTX_ENTRY_LOWER_SLPTPTR_POS (12U)
#define CTX_ENTRY_LOWER_SLPTPTR_MASK (0xFFFFFFFFFFFFFUL << CTX_ENTRY_LOWER_SLPTPTR_POS)
static inline uint64_t dmar_get_bitslice(uint64_t var, uint64_t mask, uint32_t pos)
{
return ((var & mask) >> pos);
}
static inline uint64_t dmar_set_bitslice(uint64_t var, uint64_t mask, uint32_t pos, uint64_t val)
{
return ((var & ~mask) | ((val << pos) & mask));
}
/* translation type */
#define DMAR_CTX_TT_UNTRANSLATED 0x0UL
#define DMAR_CTX_TT_ALL 0x1UL
#define DMAR_CTX_TT_PASSTHROUGH 0x2UL
/* Fault event MSI data register */
#define DMAR_MSI_DELIVERY_MODE_SHIFT (8U)
#define DMAR_MSI_DELIVERY_FIXED (0U << DMAR_MSI_DELIVERY_MODE_SHIFT)
#define DMAR_MSI_DELIVERY_LOWPRI (1U << DMAR_MSI_DELIVERY_MODE_SHIFT)
/* Fault event MSI address register */
#define DMAR_MSI_DEST_MODE_SHIFT (2U)
#define DMAR_MSI_DEST_MODE_PHYS (0U << DMAR_MSI_DEST_MODE_SHIFT)
#define DMAR_MSI_DEST_MODE_LOGIC (1U << DMAR_MSI_DEST_MODE_SHIFT)
#define DMAR_MSI_REDIRECTION_SHIFT (3U)
#define DMAR_MSI_REDIRECTION_CPU (0U << DMAR_MSI_REDIRECTION_SHIFT)
#define DMAR_MSI_REDIRECTION_LOWPRI (1U << DMAR_MSI_REDIRECTION_SHIFT)
enum dmar_cirg_type {
DMAR_CIRG_RESERVED = 0,
DMAR_CIRG_GLOBAL,
DMAR_CIRG_DOMAIN,
DMAR_CIRG_DEVICE
};
enum dmar_iirg_type {
DMAR_IIRG_RESERVED = 0,
DMAR_IIRG_GLOBAL,
DMAR_IIRG_DOMAIN,
DMAR_IIRG_PAGE
};
/* dmar unit runtime data */
struct dmar_drhd_rt {
uint32_t index;
spinlock_t lock;
struct dmar_drhd *drhd;
uint64_t root_table_addr;
uint64_t cap;
uint64_t ecap;
uint32_t gcmd; /* sw cache value of global cmd register */
uint32_t dmar_irq;
bool cap_pw_coherency; /* page-walk coherency */
uint8_t cap_msagaw;
uint16_t cap_num_fault_regs;
uint16_t cap_fault_reg_offset;
uint16_t ecap_iotlb_offset;
uint32_t fault_state[IOMMU_FAULT_REGISTER_STATE_NUM]; /* 32bit registers */
};
struct dmar_root_entry {
uint64_t lower;
uint64_t upper;
};
struct dmar_context_entry {
uint64_t lower;
uint64_t upper;
};
struct iommu_domain {
bool is_host;
bool is_tt_ept; /* if reuse EPT of the domain */
uint16_t vm_id;
uint32_t addr_width; /* address width of the domain */
uint64_t trans_table_ptr;
bool iommu_snoop;
};
struct context_table {
struct page buses[CONFIG_IOMMU_BUS_NUM];
};
static inline uint8_t* get_root_table(uint32_t dmar_index)
{
static struct page root_tables[CONFIG_MAX_IOMMU_NUM] __aligned(PAGE_SIZE);
return root_tables[dmar_index].contents;
}
static inline uint8_t* get_ctx_table(uint32_t dmar_index, uint8_t bus_no)
{
static struct context_table ctx_tables[CONFIG_MAX_IOMMU_NUM] __aligned(PAGE_SIZE);
return ctx_tables[dmar_index].buses[bus_no].contents;
}
bool iommu_snoop_supported(const struct acrn_vm *vm)
{
bool ret;
if ((vm->iommu == NULL) || (vm->iommu->iommu_snoop)) {
ret = true;
} else {
ret = false;
}
return ret;
}
static struct dmar_drhd_rt dmar_drhd_units[CONFIG_MAX_IOMMU_NUM];
static bool iommu_page_walk_coherent = true;
static struct iommu_domain *vm0_domain;
/* Domain id 0 is reserved in some cases per VT-d */
#define MAX_DOMAIN_NUM (CONFIG_MAX_VM_NUM + 1)
static inline uint16_t vmid_to_domainid(uint16_t vm_id)
{
return vm_id + 1U;
}
static int32_t dmar_register_hrhd(struct dmar_drhd_rt *dmar_unit);
static struct dmar_drhd_rt *device_to_dmaru(uint16_t segment, uint8_t bus, uint8_t devfun);
static int32_t register_hrhd_units(void)
{
struct dmar_info *info = get_dmar_info();
struct dmar_drhd_rt *drhd_rt;
uint32_t i;
int32_t ret = 0;
if ((info == NULL) || (info->drhd_count == 0U)) {
pr_fatal("%s: can't find dmar info\n", __func__);
ret = -ENODEV;
} else if (info->drhd_count > CONFIG_MAX_IOMMU_NUM) {
pr_fatal("%s: dmar count(%d) beyond the limitation(%d)\n",
__func__, info->drhd_count, CONFIG_MAX_IOMMU_NUM);
ret = -EINVAL;
} else {
for (i = 0U; i < info->drhd_count; i++) {
drhd_rt = &dmar_drhd_units[i];
drhd_rt->index = i;
drhd_rt->drhd = &info->drhd_units[i];
drhd_rt->dmar_irq = IRQ_INVALID;
ret = dmar_register_hrhd(drhd_rt);
if (ret != 0) {
break;
}
}
}
return ret;
}
static uint32_t iommu_read32(const struct dmar_drhd_rt *dmar_unit, uint32_t offset)
{
return mmio_read32(hpa2hva(dmar_unit->drhd->reg_base_addr + offset));
}
static uint64_t iommu_read64(const struct dmar_drhd_rt *dmar_unit, uint32_t offset)
{
uint64_t value;
value = mmio_read32(hpa2hva(dmar_unit->drhd->reg_base_addr + offset + 4U));
value = value << 32U;
value = value | mmio_read32(hpa2hva(dmar_unit->drhd->reg_base_addr + offset));
return value;
}
static void iommu_write32(const struct dmar_drhd_rt *dmar_unit, uint32_t offset, uint32_t value)
{
mmio_write32(value, hpa2hva(dmar_unit->drhd->reg_base_addr + offset));
}
static void iommu_write64(const struct dmar_drhd_rt *dmar_unit, uint32_t offset, uint64_t value)
{
uint32_t temp;
temp = (uint32_t)value;
mmio_write32(temp, hpa2hva(dmar_unit->drhd->reg_base_addr + offset));
temp = (uint32_t)(value >> 32U);
mmio_write32(temp, hpa2hva(dmar_unit->drhd->reg_base_addr + offset + 4U));
}
static inline void dmar_wait_completion(const struct dmar_drhd_rt *dmar_unit, uint32_t offset,
uint32_t mask, bool pre_condition, uint32_t *status)
{
/* variable start isn't used when built as release version */
__unused uint64_t start = rdtsc();
bool condition, temp_condition;
while (1) {
*status = iommu_read32(dmar_unit, offset);
temp_condition = ((*status & mask) == 0U) ? true : false;
/*
* pre_condition temp_condition | condition
* -----------------------------------|----------
* true true | true
* true false | false
* false true | false
* false false | true
*/
condition = (temp_condition == pre_condition) ? true : false;
if (condition) {
break;
}
ASSERT(((rdtsc() - start) < CYCLES_PER_MS),
"DMAR OP Timeout!");
asm_pause();
}
}
/* flush cache when root table, context table updated */
static void iommu_flush_cache(const struct dmar_drhd_rt *dmar_unit,
void *p, uint32_t size)
{
uint32_t i;
/* if vtd support page-walk coherency, no need to flush cacheline */
if (iommu_ecap_c(dmar_unit->ecap) == 0U) {
for (i = 0U; i < size; i += CACHE_LINE_SIZE) {
clflush((char *)p + i);
}
}
}
#if DBG_IOMMU
static inline uint8_t iommu_cap_rwbf(uint64_t cap)
{
return ((uint8_t)(cap >> 4U) & 1U);
}
static void dmar_unit_show_capability(struct dmar_drhd_rt *dmar_unit)
{
pr_info("dmar unit[0x%x]", dmar_unit->drhd->reg_base_addr);
pr_info("\tNumDomain:%d", iommu_cap_ndoms(dmar_unit->cap));
pr_info("\tAdvancedFaultLogging:%d", iommu_cap_afl(dmar_unit->cap));
pr_info("\tRequiredWBFlush:%d", iommu_cap_rwbf(dmar_unit->cap));
pr_info("\tProtectedLowMemRegion:%d", iommu_cap_plmr(dmar_unit->cap));
pr_info("\tProtectedHighMemRegion:%d", iommu_cap_phmr(dmar_unit->cap));
pr_info("\tCachingMode:%d", iommu_cap_caching_mode(dmar_unit->cap));
pr_info("\tSAGAW:0x%x", iommu_cap_sagaw(dmar_unit->cap));
pr_info("\tMGAW:%d", iommu_cap_mgaw(dmar_unit->cap));
pr_info("\tZeroLenRead:%d", iommu_cap_zlr(dmar_unit->cap));
pr_info("\tLargePageSupport:0x%x", iommu_cap_super_page_val(dmar_unit->cap));
pr_info("\tPageSelectiveInvalidation:%d", iommu_cap_pgsel_inv(dmar_unit->cap));
pr_info("\tPageSelectInvalidation:%d", iommu_cap_pgsel_inv(dmar_unit->cap));
pr_info("\tNumOfFaultRecordingReg:%d", iommu_cap_num_fault_regs(dmar_unit->cap));
pr_info("\tMAMV:0x%x", iommu_cap_max_amask_val(dmar_unit->cap));
pr_info("\tWriteDraining:%d", iommu_cap_write_drain(dmar_unit->cap));
pr_info("\tReadDraining:%d", iommu_cap_read_drain(dmar_unit->cap));
pr_info("\tPostInterrupts:%d\n", iommu_cap_pi(dmar_unit->cap));
pr_info("\tPage-walk Coherency:%d", iommu_ecap_c(dmar_unit->ecap));
pr_info("\tQueuedInvalidation:%d", iommu_ecap_qi(dmar_unit->ecap));
pr_info("\tDeviceTLB:%d", iommu_ecap_dt(dmar_unit->ecap));
pr_info("\tInterruptRemapping:%d", iommu_ecap_ir(dmar_unit->ecap));
pr_info("\tExtendedInterruptMode:%d", iommu_ecap_eim(dmar_unit->ecap));
pr_info("\tPassThrough:%d", iommu_ecap_pt(dmar_unit->ecap));
pr_info("\tSnoopControl:%d", iommu_ecap_sc(dmar_unit->ecap));
pr_info("\tIOTLB RegOffset:0x%x", iommu_ecap_iro(dmar_unit->ecap));
pr_info("\tMHMV:0x%x", iommu_ecap_mhmv(dmar_unit->ecap));
pr_info("\tECS:%d", iommu_ecap_ecs(dmar_unit->ecap));
pr_info("\tMTS:%d", iommu_ecap_mts(dmar_unit->ecap));
pr_info("\tNEST:%d", iommu_ecap_nest(dmar_unit->ecap));
pr_info("\tDIS:%d", iommu_ecap_dis(dmar_unit->ecap));
pr_info("\tPRS:%d", iommu_ecap_prs(dmar_unit->ecap));
pr_info("\tERS:%d", iommu_ecap_ers(dmar_unit->ecap));
pr_info("\tSRS:%d", iommu_ecap_srs(dmar_unit->ecap));
pr_info("\tNWFS:%d", iommu_ecap_nwfs(dmar_unit->ecap));
pr_info("\tEAFS:%d", iommu_ecap_eafs(dmar_unit->ecap));
pr_info("\tPSS:0x%x", iommu_ecap_pss(dmar_unit->ecap));
pr_info("\tPASID:%d", iommu_ecap_pasid(dmar_unit->ecap));
pr_info("\tDIT:%d", iommu_ecap_dit(dmar_unit->ecap));
pr_info("\tPDS:%d\n", iommu_ecap_pds(dmar_unit->ecap));
}
#endif
static inline uint8_t width_to_level(uint32_t width)
{
return (uint8_t)(((width - 12U) + (LEVEL_WIDTH)-1U) / (LEVEL_WIDTH));
}
static inline uint8_t width_to_agaw(uint32_t width)
{
return width_to_level(width) - 2U;
}
static uint8_t dmar_unit_get_msagw(const struct dmar_drhd_rt *dmar_unit)
{
uint8_t i;
uint8_t sgaw = iommu_cap_sagaw(dmar_unit->cap);
for (i = 5U; i > 0U; ) {
i--;
if (((1U << i) & sgaw) != 0U) {
break;
}
}
return i;
}
static bool dmar_unit_support_aw(const struct dmar_drhd_rt *dmar_unit, uint32_t addr_width)
{
uint8_t aw;
aw = width_to_agaw(addr_width);
return (((1U << aw) & iommu_cap_sagaw(dmar_unit->cap)) != 0U);
}
static void dmar_enable_translation(struct dmar_drhd_rt *dmar_unit)
{
uint32_t status = 0;
spinlock_obtain(&(dmar_unit->lock));
if ((dmar_unit->gcmd & DMA_GCMD_TE) == 0U) {
dmar_unit->gcmd |= DMA_GCMD_TE;
iommu_write32(dmar_unit, DMAR_GCMD_REG, dmar_unit->gcmd);
/* 32-bit register */
dmar_wait_completion(dmar_unit, DMAR_GSTS_REG, DMA_GSTS_TES, false, &status);
#if DBG_IOMMU
status = iommu_read32(dmar_unit, DMAR_GSTS_REG);
#endif
}
spinlock_release(&(dmar_unit->lock));
dev_dbg(ACRN_DBG_IOMMU, "%s: gsr:0x%x", __func__, status);
}
static void dmar_disable_translation(struct dmar_drhd_rt *dmar_unit)
{
uint32_t status;
spinlock_obtain(&(dmar_unit->lock));
if ((dmar_unit->gcmd & DMA_GCMD_TE) != 0U) {
dmar_unit->gcmd &= ~DMA_GCMD_TE;
iommu_write32(dmar_unit, DMAR_GCMD_REG, dmar_unit->gcmd);
/* 32-bit register */
dmar_wait_completion(dmar_unit, DMAR_GSTS_REG, DMA_GSTS_TES, true, &status);
}
spinlock_release(&(dmar_unit->lock));
}
static int32_t dmar_register_hrhd(struct dmar_drhd_rt *dmar_unit)
{
int32_t ret = 0;
dev_dbg(ACRN_DBG_IOMMU, "Register dmar uint [%d] @0x%llx", dmar_unit->index, dmar_unit->drhd->reg_base_addr);
spinlock_init(&dmar_unit->lock);
dmar_unit->cap = iommu_read64(dmar_unit, DMAR_CAP_REG);
dmar_unit->ecap = iommu_read64(dmar_unit, DMAR_ECAP_REG);
dmar_unit->gcmd = iommu_read32(dmar_unit, DMAR_GCMD_REG);
dmar_unit->cap_msagaw = dmar_unit_get_msagw(dmar_unit);
dmar_unit->cap_num_fault_regs = iommu_cap_num_fault_regs(dmar_unit->cap);
dmar_unit->cap_fault_reg_offset = iommu_cap_fault_reg_offset(dmar_unit->cap);
dmar_unit->ecap_iotlb_offset = iommu_ecap_iro(dmar_unit->ecap) * 16U;
#if DBG_IOMMU
pr_info("version:0x%x, cap:0x%llx, ecap:0x%llx",
iommu_read32(dmar_unit, DMAR_VER_REG), dmar_unit->cap, dmar_unit->ecap);
pr_info("sagaw:0x%x, msagaw:0x%x, iotlb offset 0x%x",
iommu_cap_sagaw(dmar_unit->cap), dmar_unit->cap_msagaw, dmar_unit->ecap_iotlb_offset);
dmar_unit_show_capability(dmar_unit);
#endif
/* check capability */
if ((iommu_cap_super_page_val(dmar_unit->cap) & 0x1U) == 0U) {
pr_fatal("%s: dmar uint doesn't support 2MB page!\n", __func__);
ret = -ENODEV;
} else if ((iommu_cap_super_page_val(dmar_unit->cap) & 0x2U) == 0U) {
pr_fatal("%s: dmar uint doesn't support 1GB page!\n", __func__);
ret = -ENODEV;
} else {
if ((iommu_ecap_c(dmar_unit->ecap) == 0U) && (dmar_unit->drhd->ignore != 0U)) {
iommu_page_walk_coherent = false;
}
/* when the hardware support snoop control,
* to make sure snoop control is always enabled,
* the SNP filed in the leaf PTE should be set.
* How to guarantee it when EPT is used as second-level
* translation paging structures?
*/
if (iommu_ecap_sc(dmar_unit->ecap) == 0U) {
dev_dbg(ACRN_DBG_IOMMU, "dmar uint doesn't support snoop control!");
}
dmar_disable_translation(dmar_unit);
}
return ret;
}
static struct dmar_drhd_rt *device_to_dmaru(uint16_t segment, uint8_t bus, uint8_t devfun)
{
struct dmar_info *info = get_dmar_info();
struct dmar_drhd_rt *dmar_unit = NULL;
uint32_t i, j;
if (info == NULL) {
pr_fatal("%s: can't find dmar info\n", __func__);
} else {
for (j = 0U; j < info->drhd_count; j++) {
dmar_unit = &dmar_drhd_units[j];
if (dmar_unit->drhd->segment != segment) {
continue;
}
for (i = 0U; i < dmar_unit->drhd->dev_cnt; i++) {
if ((dmar_unit->drhd->devices[i].bus == bus) &&
(dmar_unit->drhd->devices[i].devfun == devfun)) {
break;
}
}
/* found exact one or the one which has the same segment number with INCLUDE_PCI_ALL set */
if ((i != dmar_unit->drhd->dev_cnt) || ((dmar_unit->drhd->flags & DRHD_FLAG_INCLUDE_PCI_ALL_MASK) != 0U)) {
break;
}
}
/* not found */
if (j == info->drhd_count) {
dmar_unit = NULL;
}
}
return dmar_unit;
}
/*
* did: domain id
* sid: source id
* fm: function mask
* cirg: cache-invalidation request granularity
*/
static void dmar_invalid_context_cache(struct dmar_drhd_rt *dmar_unit,
uint16_t did, uint16_t sid, uint8_t fm, enum dmar_cirg_type cirg)
{
uint64_t cmd = DMA_CCMD_ICC;
uint32_t status;
switch (cirg) {
case DMAR_CIRG_GLOBAL:
cmd |= DMA_CCMD_GLOBAL_INVL;
break;
case DMAR_CIRG_DOMAIN:
cmd |= DMA_CCMD_DOMAIN_INVL | dma_ccmd_did(did);
break;
case DMAR_CIRG_DEVICE:
cmd |= DMA_CCMD_DEVICE_INVL | dma_ccmd_did(did) | dma_ccmd_sid(sid) | dma_ccmd_fm(fm);
break;
default:
cmd = 0UL;
pr_err("unknown CIRG type");
break;
}
if (cmd != 0UL) {
spinlock_obtain(&(dmar_unit->lock));
iommu_write64(dmar_unit, DMAR_CCMD_REG, cmd);
/* read upper 32bits to check */
dmar_wait_completion(dmar_unit, DMAR_CCMD_REG + 4U, DMA_CCMD_ICC_32, true, &status);
spinlock_release(&(dmar_unit->lock));
dev_dbg(ACRN_DBG_IOMMU, "cc invalidation granularity %d", dma_ccmd_get_caig_32(status));
}
}
static void dmar_invalid_context_cache_global(struct dmar_drhd_rt *dmar_unit)
{
dmar_invalid_context_cache(dmar_unit, 0U, 0U, 0U, DMAR_CIRG_GLOBAL);
}
static void dmar_invalid_iotlb(struct dmar_drhd_rt *dmar_unit, uint16_t did, uint64_t address, uint8_t am,
bool hint, enum dmar_iirg_type iirg)
{
/* set Drain Reads & Drain Writes,
* if hardware doesn't support it, will be ignored by hardware
*/
uint64_t cmd = DMA_IOTLB_IVT | DMA_IOTLB_DR | DMA_IOTLB_DW;
uint64_t addr = 0UL;
uint32_t status;
switch (iirg) {
case DMAR_IIRG_GLOBAL:
cmd |= DMA_IOTLB_GLOBAL_INVL;
break;
case DMAR_IIRG_DOMAIN:
cmd |= DMA_IOTLB_DOMAIN_INVL | dma_iotlb_did(did);
break;
case DMAR_IIRG_PAGE:
cmd |= DMA_IOTLB_PAGE_INVL | dma_iotlb_did(did);
addr = address | dma_iotlb_invl_addr_am(am);
if (hint) {
addr |= DMA_IOTLB_INVL_ADDR_IH_UNMODIFIED;
}
break;
default:
cmd = 0UL;
pr_err("unknown IIRG type");
}
if (cmd != 0UL) {
spinlock_obtain(&(dmar_unit->lock));
if (addr != 0U) {
iommu_write64(dmar_unit, dmar_unit->ecap_iotlb_offset, addr);
}
iommu_write64(dmar_unit, dmar_unit->ecap_iotlb_offset + 8U, cmd);
/* read upper 32bits to check */
dmar_wait_completion(dmar_unit, dmar_unit->ecap_iotlb_offset + 12U, DMA_IOTLB_IVT_32, true, &status);
spinlock_release(&(dmar_unit->lock));
if (dma_iotlb_get_iaig_32(status) == 0U) {
pr_err("fail to invalidate IOTLB!, 0x%x, 0x%x", status, iommu_read32(dmar_unit, DMAR_FSTS_REG));
}
}
}
/* Invalidate IOTLB globally,
* all iotlb entries are invalidated,
* all PASID-cache entries are invalidated,
* all paging-structure-cache entries are invalidated.
*/
static void dmar_invalid_iotlb_global(struct dmar_drhd_rt *dmar_unit)
{
dmar_invalid_iotlb(dmar_unit, 0U, 0UL, 0U, false, DMAR_IIRG_GLOBAL);
}
static void dmar_set_root_table(struct dmar_drhd_rt *dmar_unit)
{
uint64_t address;
uint32_t status;
spinlock_obtain(&(dmar_unit->lock));
/*
* dmar_set_root_table is called from init_iommu and
* resume_iommu. So NULL check on this pointer is needed
* so that we do not change the root table pointer in the
* resume flow.
*/
if (dmar_unit->root_table_addr == 0UL) {
dmar_unit->root_table_addr = hva2hpa(get_root_table(dmar_unit->index));
}
/* Currently don't support extended root table */
address = dmar_unit->root_table_addr;
iommu_write64(dmar_unit, DMAR_RTADDR_REG, address);
iommu_write32(dmar_unit, DMAR_GCMD_REG, dmar_unit->gcmd | DMA_GCMD_SRTP);
/* 32-bit register */
dmar_wait_completion(dmar_unit, DMAR_GSTS_REG, DMA_GSTS_RTPS, false, &status);
spinlock_release(&(dmar_unit->lock));
}
static void dmar_fault_event_mask(struct dmar_drhd_rt *dmar_unit)
{
spinlock_obtain(&(dmar_unit->lock));
iommu_write32(dmar_unit, DMAR_FECTL_REG, DMA_FECTL_IM);
spinlock_release(&(dmar_unit->lock));
}
static void dmar_fault_event_unmask(struct dmar_drhd_rt *dmar_unit)
{
spinlock_obtain(&(dmar_unit->lock));
iommu_write32(dmar_unit, DMAR_FECTL_REG, 0U);
spinlock_release(&(dmar_unit->lock));
}
static void dmar_fault_msi_write(struct dmar_drhd_rt *dmar_unit,
uint32_t vector)
{
uint32_t data;
uint32_t addr_low;
uint32_t lapic_id = get_cur_lapic_id();
data = DMAR_MSI_DELIVERY_LOWPRI | vector;
/* redirection hint: 0
* destination mode: 0
*/
addr_low = 0xFEE00000U | ((uint32_t)(lapic_id) << 12U);
spinlock_obtain(&(dmar_unit->lock));
iommu_write32(dmar_unit, DMAR_FEDATA_REG, data);
iommu_write32(dmar_unit, DMAR_FEADDR_REG, addr_low);
spinlock_release(&(dmar_unit->lock));
}
#if DBG_IOMMU
static void fault_status_analysis(uint32_t status)
{
if (dma_fsts_pfo(status)) {
pr_info("Primary Fault Overflow");
}
if (dma_fsts_ppf(status)) {
pr_info("Primary Pending Fault");
}
if (dma_fsts_afo(status)) {
pr_info("Advanced Fault Overflow");
}
if (dma_fsts_apf(status)) {
pr_info("Advanced Pending Fault");
}
if (dma_fsts_iqe(status)) {
pr_info("Invalidation Queue Error");
}
if (dma_fsts_ice(status)) {
pr_info("Invalidation Completion Error");
}
if (dma_fsts_ite(status)) {
pr_info("Invalidation Time-out Error");
}
if (dma_fsts_pro(status)) {
pr_info("Page Request Overflow");
}
}
#endif
static void fault_record_analysis(__unused uint64_t low, uint64_t high)
{
if (!dma_frcd_up_f(high)) {
/* currently skip PASID related parsing */
pr_info("%s, Reason: 0x%x, SID: %x.%x.%x @0x%llx",
(dma_frcd_up_t(high) != 0U) ? "Read/Atomic" : "Write", dma_frcd_up_fr(high),
pci_bus(dma_frcd_up_sid(high)), pci_slot(dma_frcd_up_sid(high)), pci_func(dma_frcd_up_sid(high)), low);
#if DBG_IOMMU
if (iommu_ecap_dt(dmar_unit->ecap) != 0U) {
pr_info("Address Type: 0x%x", dma_frcd_up_at(high));
}
#endif
}
}
static void dmar_fault_handler(uint32_t irq, void *data)
{
struct dmar_drhd_rt *dmar_unit = (struct dmar_drhd_rt *)data;
uint32_t fsr;
uint32_t index;
uint32_t record_reg_offset;
uint64_t record[2];
int32_t loop = 0;
dev_dbg(ACRN_DBG_IOMMU, "%s: irq = %d", __func__, irq);
fsr = iommu_read32(dmar_unit, DMAR_FSTS_REG);
#if DBG_IOMMU
fault_status_analysis(fsr);
#endif
while (dma_fsts_ppf(fsr)) {
loop++;
index = dma_fsts_fri(fsr);
record_reg_offset = (uint32_t)dmar_unit->cap_fault_reg_offset + (index * 16U);
if (index >= dmar_unit->cap_num_fault_regs) {
dev_dbg(ACRN_DBG_IOMMU, "%s: invalid FR Index", __func__);
break;
}
/* read 128-bit fault recording register */
record[0] = iommu_read64(dmar_unit, record_reg_offset);
record[1] = iommu_read64(dmar_unit, record_reg_offset + 8U);
dev_dbg(ACRN_DBG_IOMMU, "%s: record[%d] @0x%x: 0x%llx, 0x%llx",
__func__, index, record_reg_offset, record[0], record[1]);
fault_record_analysis(record[0], record[1]);
/* write to clear */
iommu_write64(dmar_unit, record_reg_offset, record[0]);
iommu_write64(dmar_unit, record_reg_offset + 8U, record[1]);
#ifdef DMAR_FAULT_LOOP_MAX
if (loop > DMAR_FAULT_LOOP_MAX) {
dev_dbg(ACRN_DBG_IOMMU, "%s: loop more than %d times", __func__, DMAR_FAULT_LOOP_MAX);
break;
}
#endif
fsr = iommu_read32(dmar_unit, DMAR_FSTS_REG);
}
}
static void dmar_setup_interrupt(struct dmar_drhd_rt *dmar_unit)
{
uint32_t vector;
int32_t retval = 0;
spinlock_obtain(&(dmar_unit->lock));
if (dmar_unit->dmar_irq == IRQ_INVALID) {
retval = request_irq(IRQ_INVALID, dmar_fault_handler, dmar_unit, IRQF_NONE);
dmar_unit->dmar_irq = (uint32_t)retval;
}
spinlock_release(&(dmar_unit->lock));
/* the panic will only happen before any VM starts running */
if (retval < 0 ) {
panic("dmar[%d] fail to setup interrupt", dmar_unit->index);
}
vector = irq_to_vector(dmar_unit->dmar_irq);
dev_dbg(ACRN_DBG_IOMMU, "irq#%d vector#%d for dmar_unit", dmar_unit->dmar_irq, vector);
dmar_fault_msi_write(dmar_unit, vector);
dmar_fault_event_unmask(dmar_unit);
}
static void dmar_prepare(struct dmar_drhd_rt *dmar_unit)
{
dev_dbg(ACRN_DBG_IOMMU, "enable dmar uint [0x%x]", dmar_unit->drhd->reg_base_addr);
dmar_setup_interrupt(dmar_unit);
dmar_set_root_table(dmar_unit);
}
static void dmar_enable(struct dmar_drhd_rt *dmar_unit)
{
dev_dbg(ACRN_DBG_IOMMU, "enable dmar uint [0x%x]", dmar_unit->drhd->reg_base_addr);
dmar_invalid_context_cache_global(dmar_unit);
dmar_invalid_iotlb_global(dmar_unit);
dmar_enable_translation(dmar_unit);
}
static void dmar_disable(struct dmar_drhd_rt *dmar_unit)
{
dmar_disable_translation(dmar_unit);
dmar_fault_event_mask(dmar_unit);
}
static void dmar_suspend(struct dmar_drhd_rt *dmar_unit)
{
uint32_t i;
dmar_invalid_context_cache_global(dmar_unit);
dmar_invalid_iotlb_global(dmar_unit);
dmar_disable(dmar_unit);
/* save IOMMU fault register state */
for (i = 0U; i < IOMMU_FAULT_REGISTER_STATE_NUM; i++) {
dmar_unit->fault_state[i] = iommu_read32(dmar_unit, DMAR_FECTL_REG + (i * IOMMU_FAULT_REGISTER_SIZE));
}
}
static void dmar_resume(struct dmar_drhd_rt *dmar_unit)
{
uint32_t i;
/* restore IOMMU fault register state */
for (i = 0U; i < IOMMU_FAULT_REGISTER_STATE_NUM; i++) {
iommu_write32(dmar_unit, DMAR_FECTL_REG + (i * IOMMU_FAULT_REGISTER_SIZE), dmar_unit->fault_state[i]);
}
dmar_prepare(dmar_unit);
dmar_enable(dmar_unit);
}
static int32_t add_iommu_device(struct iommu_domain *domain, uint16_t segment, uint8_t bus, uint8_t devfun)
{
struct dmar_drhd_rt *dmar_unit;
struct dmar_root_entry *root_table;
uint64_t context_table_addr;
struct dmar_context_entry *context;
struct dmar_root_entry *root_entry;
struct dmar_context_entry *context_entry;
uint64_t upper;
uint64_t lower = 0UL;
struct acrn_vm *vm;
int32_t ret = 0;
dmar_unit = device_to_dmaru(segment, bus, devfun);
if (dmar_unit == NULL) {
pr_err("no dmar unit found for device: %x:%x.%x", bus, pci_slot(devfun), pci_func(devfun));
ret = -EINVAL;
} else if (dmar_unit->drhd->ignore) {
dev_dbg(ACRN_DBG_IOMMU, "device is ignored :0x%x:%x.%x", bus, pci_slot(devfun), pci_func(devfun));
} else if ((!dmar_unit_support_aw(dmar_unit, domain->addr_width)) || (dmar_unit->root_table_addr == 0UL)) {
pr_err("invalid dmar unit");
ret = -EINVAL;
} else {
if (iommu_ecap_sc(dmar_unit->ecap) == 0U) {
vm = get_vm_from_vmid(domain->vm_id);
if (vm != NULL) {
vm->snoopy_mem = false;
}
/* TODO: remove iommu_snoop from iommu_domain */
domain->iommu_snoop = false;
dev_dbg(ACRN_DBG_IOMMU, "vm=%d add %x:%x no snoop control!", domain->vm_id, bus, devfun);
}
root_table = (struct dmar_root_entry *)hpa2hva(dmar_unit->root_table_addr);
root_entry = root_table + bus;
if (dmar_get_bitslice(root_entry->lower,
ROOT_ENTRY_LOWER_PRESENT_MASK,
ROOT_ENTRY_LOWER_PRESENT_POS) == 0UL) {
/* create context table for the bus if not present */
context_table_addr = hva2hpa(get_ctx_table(dmar_unit->index, bus));
context_table_addr = context_table_addr >> PAGE_SHIFT;
lower = dmar_set_bitslice(lower,
ROOT_ENTRY_LOWER_CTP_MASK, ROOT_ENTRY_LOWER_CTP_POS, context_table_addr);
lower = dmar_set_bitslice(lower,
ROOT_ENTRY_LOWER_PRESENT_MASK, ROOT_ENTRY_LOWER_PRESENT_POS, 1UL);
root_entry->upper = 0UL;
root_entry->lower = lower;
iommu_flush_cache(dmar_unit, root_entry, sizeof(struct dmar_root_entry));
} else {
context_table_addr = dmar_get_bitslice(root_entry->lower,
ROOT_ENTRY_LOWER_CTP_MASK, ROOT_ENTRY_LOWER_CTP_POS);
}
context_table_addr = context_table_addr << PAGE_SHIFT;
context = (struct dmar_context_entry *)hpa2hva(context_table_addr);
context_entry = context + devfun;
if (context_entry == NULL) {
pr_err("dmar context entry is invalid");
ret = -EINVAL;
} else if (dmar_get_bitslice(context_entry->lower, CTX_ENTRY_LOWER_P_MASK, CTX_ENTRY_LOWER_P_POS) != 0UL) {
/* the context entry should not be present */
pr_err("%s: context entry@0x%llx (Lower:%x) ", __func__, context_entry, context_entry->lower);
pr_err("already present for %x:%x.%x", bus, pci_slot(devfun), pci_func(devfun));
ret = -EBUSY;
} else {
/* setup context entry for the devfun */
upper = 0UL;
lower = 0UL;
if (domain->is_host) {
if (iommu_ecap_pt(dmar_unit->ecap) != 0U) {
/* When the Translation-type (T) field indicates
* pass-through processing (10b), AW field must be
* programmed to indicate the largest AGAW value
* supported by hardware.
*/
upper = dmar_set_bitslice(upper,
CTX_ENTRY_UPPER_AW_MASK, CTX_ENTRY_UPPER_AW_POS, dmar_unit->cap_msagaw);
lower = dmar_set_bitslice(lower,
CTX_ENTRY_LOWER_TT_MASK, CTX_ENTRY_LOWER_TT_POS, DMAR_CTX_TT_PASSTHROUGH);
} else {
pr_err("dmaru[%d] doesn't support trans passthrough", dmar_unit->index);
ret = -ENODEV;
}
} else {
/* TODO: add Device TLB support */
upper = dmar_set_bitslice(upper,
CTX_ENTRY_UPPER_AW_MASK, CTX_ENTRY_UPPER_AW_POS, (uint64_t)width_to_agaw(domain->addr_width));
lower = dmar_set_bitslice(lower,
CTX_ENTRY_LOWER_TT_MASK, CTX_ENTRY_LOWER_TT_POS, DMAR_CTX_TT_UNTRANSLATED);
}
if (ret == 0) {
upper = dmar_set_bitslice(upper,
CTX_ENTRY_UPPER_DID_MASK, CTX_ENTRY_UPPER_DID_POS, (uint64_t)vmid_to_domainid(domain->vm_id));
lower = dmar_set_bitslice(lower,
CTX_ENTRY_LOWER_SLPTPTR_MASK, CTX_ENTRY_LOWER_SLPTPTR_POS, domain->trans_table_ptr >> PAGE_SHIFT);
lower = dmar_set_bitslice(lower, CTX_ENTRY_LOWER_P_MASK, CTX_ENTRY_LOWER_P_POS, 1UL);
context_entry->upper = upper;
context_entry->lower = lower;
iommu_flush_cache(dmar_unit, context_entry, sizeof(struct dmar_context_entry));
}
}
}
return ret;
}
static int32_t remove_iommu_device(const struct iommu_domain *domain, uint16_t segment, uint8_t bus, uint8_t devfun)
{
struct dmar_drhd_rt *dmar_unit;
struct dmar_root_entry *root_table;
uint64_t context_table_addr;
struct dmar_context_entry *context;
struct dmar_root_entry *root_entry;
struct dmar_context_entry *context_entry;
int32_t ret = 0;
dmar_unit = device_to_dmaru(segment, bus, devfun);
if (dmar_unit == NULL) {
pr_err("no dmar unit found for device: %x:%x.%x", bus, pci_slot(devfun), pci_func(devfun));
ret = -EINVAL;
} else {
root_table = (struct dmar_root_entry *)hpa2hva(dmar_unit->root_table_addr);
root_entry = root_table + bus;
if (root_entry == NULL) {
pr_err("dmar root table entry is invalid\n");
ret = -EINVAL;
} else {
context_table_addr = dmar_get_bitslice(root_entry->lower, ROOT_ENTRY_LOWER_CTP_MASK, ROOT_ENTRY_LOWER_CTP_POS);
context_table_addr = context_table_addr << PAGE_SHIFT;
context = (struct dmar_context_entry *)hpa2hva(context_table_addr);
context_entry = context + devfun;
if (context_entry == NULL) {
pr_err("dmar context entry is invalid");
ret = -EINVAL;
} else if ((uint16_t)dmar_get_bitslice(context_entry->upper, CTX_ENTRY_UPPER_DID_MASK, CTX_ENTRY_UPPER_DID_POS) != vmid_to_domainid(domain->vm_id)) {
pr_err("%s: domain id mismatch", __func__);
ret = -EPERM;
} else {
/* clear the present bit first */
context_entry->lower = 0UL;
context_entry->upper = 0UL;
iommu_flush_cache(dmar_unit, context_entry, sizeof(struct dmar_context_entry));
dmar_invalid_context_cache_global(dmar_unit);
dmar_invalid_iotlb_global(dmar_unit);
}
}
}
return ret;
}
/*
* @pre action != NULL
* As an internal API, VT-d code can guarantee action is not NULL.
*/
static void do_action_for_iommus(void (*action)(struct dmar_drhd_rt *))
{
struct dmar_info *info = get_dmar_info();
struct dmar_drhd_rt *dmar_unit;
uint32_t i;
if (info != NULL) {
for (i = 0U; i < info->drhd_count; i++) {
dmar_unit = &dmar_drhd_units[i];
if (!dmar_unit->drhd->ignore) {
action(dmar_unit);
} else {
dev_dbg(ACRN_DBG_IOMMU, "ignore dmar_unit @0x%x", dmar_unit->drhd->reg_base_addr);
}
}
} else {
pr_fatal("%s: can't find dmar info\n", __func__);
}
}
struct iommu_domain *create_iommu_domain(uint16_t vm_id, uint64_t translation_table, uint32_t addr_width)
{
static struct iommu_domain iommu_domains[MAX_DOMAIN_NUM];
struct iommu_domain *domain;
/* TODO: check if a domain with the vm_id exists */
if (translation_table == 0UL) {
pr_err("translation table is NULL");
domain = NULL;
} else {
/*
* A hypercall is called to create an iommu domain for a valid VM,
* and hv code limit the VM number to CONFIG_MAX_VM_NUM.
* So the array iommu_domains will not be accessed out of range.
*/
domain = &iommu_domains[vmid_to_domainid(vm_id)];
domain->is_host = false;
domain->vm_id = vm_id;
domain->trans_table_ptr = translation_table;
domain->addr_width = addr_width;
domain->is_tt_ept = true;
dev_dbg(ACRN_DBG_IOMMU, "create domain [%d]: vm_id = %hu, ept@0x%x",
vmid_to_domainid(domain->vm_id), domain->vm_id, domain->trans_table_ptr);
}
return domain;
}
/**
* @pre domain != NULL
*/
void destroy_iommu_domain(struct iommu_domain *domain)
{
/* currently only support ept */
if (!domain->is_tt_ept) {
ASSERT(false, "translation_table is not EPT!");
}
/* TODO: check if any device assigned to this domain */
(void)memset(domain, 0U, sizeof(*domain));
}
int32_t assign_iommu_device(struct iommu_domain *domain, uint8_t bus, uint8_t devfun)
{
int32_t status = 0;
/* TODO: check if the device assigned */
if (vm0_domain != NULL) {
status = remove_iommu_device(vm0_domain, 0U, bus, devfun);
}
if (status == 0) {
status = add_iommu_device(domain, 0U, bus, devfun);
}
return status;
}
int32_t unassign_iommu_device(const struct iommu_domain *domain, uint8_t bus, uint8_t devfun)
{
int32_t status = 0;
/* TODO: check if the device assigned */
status = remove_iommu_device(domain, 0U, bus, devfun);
if ((status == 0) && (vm0_domain != NULL)) {
status = add_iommu_device(vm0_domain, 0U, bus, devfun);
}
return status;
}
void enable_iommu(void)
{
if (!iommu_page_walk_coherent) {
cache_flush_invalidate_all();
}
do_action_for_iommus(dmar_enable);
}
void disable_iommu(void)
{
do_action_for_iommus(dmar_disable);
}
void suspend_iommu(void)
{
do_action_for_iommus(dmar_suspend);
}
void resume_iommu(void)
{
do_action_for_iommus(dmar_resume);
}
int32_t init_iommu(void)
{
int32_t ret = 0;
ret = register_hrhd_units();
if (ret == 0) {
do_action_for_iommus(dmar_prepare);
}
return ret;
}
void init_iommu_vm0_domain(struct acrn_vm *vm0)
{
uint16_t bus;
uint16_t devfun;
vm0->iommu = create_iommu_domain(vm0->vm_id, hva2hpa(vm0->arch_vm.nworld_eptp), 48U);
vm0_domain = (struct iommu_domain *) vm0->iommu;
if (vm0_domain == NULL) {
pr_err("vm0 domain is NULL\n");
} else {
for (bus = 0U; bus < CONFIG_IOMMU_BUS_NUM; bus++) {
for (devfun = 0U; devfun <= 255U; devfun++) {
if (add_iommu_device(vm0_domain, 0U, (uint8_t)bus, (uint8_t)devfun) != 0) {
/* the panic only occurs before VM0 starts running in sharing mode */
panic("Failed to add %x:%x.%x to VM0 domain", bus, pci_slot(devfun), pci_func(devfun));
}
}
}
}
}
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