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// SPDX-License-Identifier: GPL-2.0-only
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#include <linux/limits.h>
#include <linux/mman.h>
#include <linux/sizes.h>
#include <linux/vfio.h>
#include <vfio_util.h>
#include "../kselftest_harness.h"
static const char *device_bdf;
struct iommu_mapping {
u64 pgd;
u64 p4d;
u64 pud;
u64 pmd;
u64 pte;
};
static void parse_next_value(char **line, u64 *value)
{
char *token;
token = strtok_r(*line, " \t|\n", line);
if (!token)
return;
/* Caller verifies `value`. No need to check return value. */
sscanf(token, "0x%lx", value);
}
static int intel_iommu_mapping_get(const char *bdf, u64 iova,
struct iommu_mapping *mapping)
{
char iommu_mapping_path[PATH_MAX], line[PATH_MAX];
u64 line_iova = -1;
int ret = -ENOENT;
FILE *file;
char *rest;
snprintf(iommu_mapping_path, sizeof(iommu_mapping_path),
"/sys/kernel/debug/iommu/intel/%s/domain_translation_struct",
bdf);
printf("Searching for IOVA 0x%lx in %s\n", iova, iommu_mapping_path);
file = fopen(iommu_mapping_path, "r");
VFIO_ASSERT_NOT_NULL(file, "fopen(%s) failed", iommu_mapping_path);
while (fgets(line, sizeof(line), file)) {
rest = line;
parse_next_value(&rest, &line_iova);
if (line_iova != (iova / getpagesize()))
continue;
/*
* Ensure each struct field is initialized in case of empty
* page table values.
*/
memset(mapping, 0, sizeof(*mapping));
parse_next_value(&rest, &mapping->pgd);
parse_next_value(&rest, &mapping->p4d);
parse_next_value(&rest, &mapping->pud);
parse_next_value(&rest, &mapping->pmd);
parse_next_value(&rest, &mapping->pte);
ret = 0;
break;
}
fclose(file);
if (ret)
printf("IOVA not found\n");
return ret;
}
static int iommu_mapping_get(const char *bdf, u64 iova,
struct iommu_mapping *mapping)
{
if (!access("/sys/kernel/debug/iommu/intel", F_OK))
return intel_iommu_mapping_get(bdf, iova, mapping);
return -EOPNOTSUPP;
}
FIXTURE(vfio_dma_mapping_test) {
struct vfio_pci_device *device;
};
FIXTURE_VARIANT(vfio_dma_mapping_test) {
const char *iommu_mode;
u64 size;
int mmap_flags;
};
#define FIXTURE_VARIANT_ADD_IOMMU_MODE(_iommu_mode, _name, _size, _mmap_flags) \
FIXTURE_VARIANT_ADD(vfio_dma_mapping_test, _iommu_mode ## _ ## _name) { \
.iommu_mode = #_iommu_mode, \
.size = (_size), \
.mmap_flags = MAP_ANONYMOUS | MAP_PRIVATE | (_mmap_flags), \
}
FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(anonymous, 0, 0);
FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(anonymous_hugetlb_2mb, SZ_2M, MAP_HUGETLB | MAP_HUGE_2MB);
FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(anonymous_hugetlb_1gb, SZ_1G, MAP_HUGETLB | MAP_HUGE_1GB);
FIXTURE_SETUP(vfio_dma_mapping_test)
{
self->device = vfio_pci_device_init(device_bdf, variant->iommu_mode);
}
FIXTURE_TEARDOWN(vfio_dma_mapping_test)
{
vfio_pci_device_cleanup(self->device);
}
TEST_F(vfio_dma_mapping_test, dma_map_unmap)
{
const u64 size = variant->size ?: getpagesize();
const int flags = variant->mmap_flags;
struct vfio_dma_region region;
struct iommu_mapping mapping;
u64 mapping_size = size;
int rc;
region.vaddr = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, -1, 0);
/* Skip the test if there aren't enough HugeTLB pages available. */
if (flags & MAP_HUGETLB && region.vaddr == MAP_FAILED)
SKIP(return, "mmap() failed: %s (%d)\n", strerror(errno), errno);
else
ASSERT_NE(region.vaddr, MAP_FAILED);
region.iova = (u64)region.vaddr;
region.size = size;
vfio_pci_dma_map(self->device, ®ion);
printf("Mapped HVA %p (size 0x%lx) at IOVA 0x%lx\n", region.vaddr, size, region.iova);
ASSERT_EQ(region.iova, to_iova(self->device, region.vaddr));
rc = iommu_mapping_get(device_bdf, region.iova, &mapping);
if (rc == -EOPNOTSUPP)
goto unmap;
/*
* IOMMUFD compatibility-mode does not support huge mappings when
* using VFIO_TYPE1_IOMMU.
*/
if (!strcmp(variant->iommu_mode, "iommufd_compat_type1"))
mapping_size = SZ_4K;
ASSERT_EQ(0, rc);
printf("Found IOMMU mappings for IOVA 0x%lx:\n", region.iova);
printf("PGD: 0x%016lx\n", mapping.pgd);
printf("P4D: 0x%016lx\n", mapping.p4d);
printf("PUD: 0x%016lx\n", mapping.pud);
printf("PMD: 0x%016lx\n", mapping.pmd);
printf("PTE: 0x%016lx\n", mapping.pte);
switch (mapping_size) {
case SZ_4K:
ASSERT_NE(0, mapping.pte);
break;
case SZ_2M:
ASSERT_EQ(0, mapping.pte);
ASSERT_NE(0, mapping.pmd);
break;
case SZ_1G:
ASSERT_EQ(0, mapping.pte);
ASSERT_EQ(0, mapping.pmd);
ASSERT_NE(0, mapping.pud);
break;
default:
VFIO_FAIL("Unrecognized size: 0x%lx\n", mapping_size);
}
unmap:
vfio_pci_dma_unmap(self->device, ®ion);
printf("Unmapped IOVA 0x%lx\n", region.iova);
ASSERT_EQ(INVALID_IOVA, __to_iova(self->device, region.vaddr));
ASSERT_NE(0, iommu_mapping_get(device_bdf, region.iova, &mapping));
ASSERT_TRUE(!munmap(region.vaddr, size));
}
int main(int argc, char *argv[])
{
device_bdf = vfio_selftests_get_bdf(&argc, argv);
return test_harness_run(argc, argv);
}
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