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// SPDX-License-Identifier: GPL-2.0-only
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#include <uapi/linux/types.h>
#include <linux/pci_regs.h>
#include <linux/sizes.h>
#include <linux/vfio.h>
#include <libvfio.h>
#include "../kselftest_harness.h"
static const char *device_bdf;
static struct vfio_pci_bar *largest_mapped_bar(struct vfio_pci_device *device)
{
u32 flags = VFIO_REGION_INFO_FLAG_READ | VFIO_REGION_INFO_FLAG_WRITE;
struct vfio_pci_bar *largest = NULL;
u64 bar_size = 0;
for (int i = 0; i < PCI_STD_NUM_BARS; i++) {
struct vfio_pci_bar *bar = &device->bars[i];
if (!bar->vaddr)
continue;
/*
* iommu_map() maps with READ|WRITE, so require the same
* abilities for the underlying VFIO region.
*/
if ((bar->info.flags & flags) != flags)
continue;
if (bar->info.size > bar_size) {
bar_size = bar->info.size;
largest = bar;
}
}
return largest;
}
FIXTURE(vfio_dma_mapping_mmio_test) {
struct iommu *iommu;
struct vfio_pci_device *device;
struct iova_allocator *iova_allocator;
struct vfio_pci_bar *bar;
};
FIXTURE_VARIANT(vfio_dma_mapping_mmio_test) {
const char *iommu_mode;
};
#define FIXTURE_VARIANT_ADD_IOMMU_MODE(_iommu_mode) \
FIXTURE_VARIANT_ADD(vfio_dma_mapping_mmio_test, _iommu_mode) { \
.iommu_mode = #_iommu_mode, \
}
FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES();
#undef FIXTURE_VARIANT_ADD_IOMMU_MODE
FIXTURE_SETUP(vfio_dma_mapping_mmio_test)
{
self->iommu = iommu_init(variant->iommu_mode);
self->device = vfio_pci_device_init(device_bdf, self->iommu);
self->iova_allocator = iova_allocator_init(self->iommu);
self->bar = largest_mapped_bar(self->device);
if (!self->bar)
SKIP(return, "No mappable BAR found on device %s", device_bdf);
}
FIXTURE_TEARDOWN(vfio_dma_mapping_mmio_test)
{
iova_allocator_cleanup(self->iova_allocator);
vfio_pci_device_cleanup(self->device);
iommu_cleanup(self->iommu);
}
static void do_mmio_map_test(struct iommu *iommu,
struct iova_allocator *iova_allocator,
void *vaddr, size_t size)
{
struct dma_region region = {
.vaddr = vaddr,
.size = size,
.iova = iova_allocator_alloc(iova_allocator, size),
};
/*
* NOTE: Check for iommufd compat success once it lands. Native iommufd
* will never support this.
*/
if (!strcmp(iommu->mode->name, MODE_VFIO_TYPE1V2_IOMMU) ||
!strcmp(iommu->mode->name, MODE_VFIO_TYPE1_IOMMU)) {
iommu_map(iommu, ®ion);
iommu_unmap(iommu, ®ion);
} else {
VFIO_ASSERT_NE(__iommu_map(iommu, ®ion), 0);
}
}
TEST_F(vfio_dma_mapping_mmio_test, map_full_bar)
{
do_mmio_map_test(self->iommu, self->iova_allocator,
self->bar->vaddr, self->bar->info.size);
}
TEST_F(vfio_dma_mapping_mmio_test, map_partial_bar)
{
if (self->bar->info.size < 2 * getpagesize())
SKIP(return, "BAR too small (size=0x%llx)", self->bar->info.size);
do_mmio_map_test(self->iommu, self->iova_allocator,
self->bar->vaddr, getpagesize());
}
/* Test IOMMU mapping of BAR mmap with intentionally poor vaddr alignment. */
TEST_F(vfio_dma_mapping_mmio_test, map_bar_misaligned)
{
/* Limit size to bound test time for large BARs */
size_t size = min_t(size_t, self->bar->info.size, SZ_1G);
void *vaddr;
vaddr = mmap_reserve(size, SZ_1G, getpagesize());
vaddr = mmap(vaddr, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED,
self->device->fd, self->bar->info.offset);
VFIO_ASSERT_NE(vaddr, MAP_FAILED);
do_mmio_map_test(self->iommu, self->iova_allocator, vaddr, size);
VFIO_ASSERT_EQ(munmap(vaddr, size), 0);
}
int main(int argc, char *argv[])
{
device_bdf = vfio_selftests_get_bdf(&argc, argv);
return test_harness_run(argc, argv);
}
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