1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <sys/ioctl.h> 3 #include <sys/mman.h> 4 5 #include <linux/sizes.h> 6 #include <linux/vfio.h> 7 8 #include <vfio_util.h> 9 10 #include "../kselftest_harness.h" 11 12 static const char *device_bdf; 13 14 #define ASSERT_NO_MSI(_eventfd) do { \ 15 u64 __value; \ 16 \ 17 ASSERT_EQ(-1, read(_eventfd, &__value, 8)); \ 18 ASSERT_EQ(EAGAIN, errno); \ 19 } while (0) 20 21 static void region_setup(struct vfio_pci_device *device, 22 struct iova_allocator *iova_allocator, 23 struct vfio_dma_region *region, u64 size) 24 { 25 const int flags = MAP_SHARED | MAP_ANONYMOUS; 26 const int prot = PROT_READ | PROT_WRITE; 27 void *vaddr; 28 29 vaddr = mmap(NULL, size, prot, flags, -1, 0); 30 VFIO_ASSERT_NE(vaddr, MAP_FAILED); 31 32 region->vaddr = vaddr; 33 region->iova = iova_allocator_alloc(iova_allocator, size); 34 region->size = size; 35 36 vfio_pci_dma_map(device, region); 37 } 38 39 static void region_teardown(struct vfio_pci_device *device, 40 struct vfio_dma_region *region) 41 { 42 vfio_pci_dma_unmap(device, region); 43 VFIO_ASSERT_EQ(munmap(region->vaddr, region->size), 0); 44 } 45 46 FIXTURE(vfio_pci_driver_test) { 47 struct vfio_pci_device *device; 48 struct iova_allocator *iova_allocator; 49 struct vfio_dma_region memcpy_region; 50 void *vaddr; 51 int msi_fd; 52 53 u64 size; 54 void *src; 55 void *dst; 56 iova_t src_iova; 57 iova_t dst_iova; 58 iova_t unmapped_iova; 59 }; 60 61 FIXTURE_VARIANT(vfio_pci_driver_test) { 62 const char *iommu_mode; 63 }; 64 65 #define FIXTURE_VARIANT_ADD_IOMMU_MODE(_iommu_mode) \ 66 FIXTURE_VARIANT_ADD(vfio_pci_driver_test, _iommu_mode) { \ 67 .iommu_mode = #_iommu_mode, \ 68 } 69 70 FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(); 71 72 FIXTURE_SETUP(vfio_pci_driver_test) 73 { 74 struct vfio_pci_driver *driver; 75 76 self->device = vfio_pci_device_init(device_bdf, variant->iommu_mode); 77 self->iova_allocator = iova_allocator_init(self->device); 78 79 driver = &self->device->driver; 80 81 region_setup(self->device, self->iova_allocator, &self->memcpy_region, SZ_1G); 82 region_setup(self->device, self->iova_allocator, &driver->region, SZ_2M); 83 84 /* Any IOVA that doesn't overlap memcpy_region and driver->region. */ 85 self->unmapped_iova = iova_allocator_alloc(self->iova_allocator, SZ_1G); 86 87 vfio_pci_driver_init(self->device); 88 self->msi_fd = self->device->msi_eventfds[driver->msi]; 89 90 /* 91 * Use the maximum size supported by the device for memcpy operations, 92 * slimmed down to fit into the memcpy region (divided by 2 so src and 93 * dst regions do not overlap). 94 */ 95 self->size = self->device->driver.max_memcpy_size; 96 self->size = min(self->size, self->memcpy_region.size / 2); 97 98 self->src = self->memcpy_region.vaddr; 99 self->dst = self->src + self->size; 100 101 self->src_iova = to_iova(self->device, self->src); 102 self->dst_iova = to_iova(self->device, self->dst); 103 } 104 105 FIXTURE_TEARDOWN(vfio_pci_driver_test) 106 { 107 struct vfio_pci_driver *driver = &self->device->driver; 108 109 vfio_pci_driver_remove(self->device); 110 111 region_teardown(self->device, &self->memcpy_region); 112 region_teardown(self->device, &driver->region); 113 114 iova_allocator_cleanup(self->iova_allocator); 115 vfio_pci_device_cleanup(self->device); 116 } 117 118 TEST_F(vfio_pci_driver_test, init_remove) 119 { 120 int i; 121 122 for (i = 0; i < 10; i++) { 123 vfio_pci_driver_remove(self->device); 124 vfio_pci_driver_init(self->device); 125 } 126 } 127 128 TEST_F(vfio_pci_driver_test, memcpy_success) 129 { 130 fcntl_set_nonblock(self->msi_fd); 131 132 memset(self->src, 'x', self->size); 133 memset(self->dst, 'y', self->size); 134 135 ASSERT_EQ(0, vfio_pci_driver_memcpy(self->device, 136 self->src_iova, 137 self->dst_iova, 138 self->size)); 139 140 ASSERT_EQ(0, memcmp(self->src, self->dst, self->size)); 141 ASSERT_NO_MSI(self->msi_fd); 142 } 143 144 TEST_F(vfio_pci_driver_test, memcpy_from_unmapped_iova) 145 { 146 fcntl_set_nonblock(self->msi_fd); 147 148 /* 149 * Ignore the return value since not all devices will detect and report 150 * accesses to unmapped IOVAs as errors. 151 */ 152 vfio_pci_driver_memcpy(self->device, self->unmapped_iova, 153 self->dst_iova, self->size); 154 155 ASSERT_NO_MSI(self->msi_fd); 156 } 157 158 TEST_F(vfio_pci_driver_test, memcpy_to_unmapped_iova) 159 { 160 fcntl_set_nonblock(self->msi_fd); 161 162 /* 163 * Ignore the return value since not all devices will detect and report 164 * accesses to unmapped IOVAs as errors. 165 */ 166 vfio_pci_driver_memcpy(self->device, self->src_iova, 167 self->unmapped_iova, self->size); 168 169 ASSERT_NO_MSI(self->msi_fd); 170 } 171 172 TEST_F(vfio_pci_driver_test, send_msi) 173 { 174 u64 value; 175 176 vfio_pci_driver_send_msi(self->device); 177 ASSERT_EQ(8, read(self->msi_fd, &value, 8)); 178 ASSERT_EQ(1, value); 179 } 180 181 TEST_F(vfio_pci_driver_test, mix_and_match) 182 { 183 u64 value; 184 int i; 185 186 for (i = 0; i < 10; i++) { 187 memset(self->src, 'x', self->size); 188 memset(self->dst, 'y', self->size); 189 190 ASSERT_EQ(0, vfio_pci_driver_memcpy(self->device, 191 self->src_iova, 192 self->dst_iova, 193 self->size)); 194 195 ASSERT_EQ(0, memcmp(self->src, self->dst, self->size)); 196 197 vfio_pci_driver_memcpy(self->device, 198 self->unmapped_iova, 199 self->dst_iova, 200 self->size); 201 202 vfio_pci_driver_send_msi(self->device); 203 ASSERT_EQ(8, read(self->msi_fd, &value, 8)); 204 ASSERT_EQ(1, value); 205 } 206 } 207 208 TEST_F_TIMEOUT(vfio_pci_driver_test, memcpy_storm, 60) 209 { 210 struct vfio_pci_driver *driver = &self->device->driver; 211 u64 total_size; 212 u64 count; 213 214 fcntl_set_nonblock(self->msi_fd); 215 216 /* 217 * Perform up to 250GiB worth of DMA reads and writes across several 218 * memcpy operations. Some devices can support even more but the test 219 * will take too long. 220 */ 221 total_size = 250UL * SZ_1G; 222 count = min(total_size / self->size, driver->max_memcpy_count); 223 224 printf("Kicking off %lu memcpys of size 0x%lx\n", count, self->size); 225 vfio_pci_driver_memcpy_start(self->device, 226 self->src_iova, 227 self->dst_iova, 228 self->size, count); 229 230 ASSERT_EQ(0, vfio_pci_driver_memcpy_wait(self->device)); 231 ASSERT_NO_MSI(self->msi_fd); 232 } 233 234 int main(int argc, char *argv[]) 235 { 236 struct vfio_pci_device *device; 237 238 device_bdf = vfio_selftests_get_bdf(&argc, argv); 239 240 device = vfio_pci_device_init(device_bdf, default_iommu_mode); 241 if (!device->driver.ops) { 242 fprintf(stderr, "No driver found for device %s\n", device_bdf); 243 return KSFT_SKIP; 244 } 245 vfio_pci_device_cleanup(device); 246 247 return test_harness_run(argc, argv); 248 } 249