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 vfio_dma_region *region, u64 size) 23 { 24 const int flags = MAP_SHARED | MAP_ANONYMOUS; 25 const int prot = PROT_READ | PROT_WRITE; 26 void *vaddr; 27 28 vaddr = mmap(NULL, size, prot, flags, -1, 0); 29 VFIO_ASSERT_NE(vaddr, MAP_FAILED); 30 31 region->vaddr = vaddr; 32 region->iova = (u64)vaddr; 33 region->size = size; 34 35 vfio_pci_dma_map(device, region); 36 } 37 38 static void region_teardown(struct vfio_pci_device *device, 39 struct vfio_dma_region *region) 40 { 41 vfio_pci_dma_unmap(device, region); 42 VFIO_ASSERT_EQ(munmap(region->vaddr, region->size), 0); 43 } 44 45 FIXTURE(vfio_pci_driver_test) { 46 struct vfio_pci_device *device; 47 struct vfio_dma_region memcpy_region; 48 void *vaddr; 49 int msi_fd; 50 51 u64 size; 52 void *src; 53 void *dst; 54 iova_t src_iova; 55 iova_t dst_iova; 56 iova_t unmapped_iova; 57 }; 58 59 FIXTURE_SETUP(vfio_pci_driver_test) 60 { 61 struct vfio_pci_driver *driver; 62 63 self->device = vfio_pci_device_init(device_bdf, VFIO_TYPE1_IOMMU); 64 65 driver = &self->device->driver; 66 67 region_setup(self->device, &self->memcpy_region, SZ_1G); 68 region_setup(self->device, &driver->region, SZ_2M); 69 70 /* Any IOVA that doesn't overlap memcpy_region and driver->region. */ 71 self->unmapped_iova = 8UL * SZ_1G; 72 73 vfio_pci_driver_init(self->device); 74 self->msi_fd = self->device->msi_eventfds[driver->msi]; 75 76 /* 77 * Use the maximum size supported by the device for memcpy operations, 78 * slimmed down to fit into the memcpy region (divided by 2 so src and 79 * dst regions do not overlap). 80 */ 81 self->size = self->device->driver.max_memcpy_size; 82 self->size = min(self->size, self->memcpy_region.size / 2); 83 84 self->src = self->memcpy_region.vaddr; 85 self->dst = self->src + self->size; 86 87 self->src_iova = to_iova(self->device, self->src); 88 self->dst_iova = to_iova(self->device, self->dst); 89 } 90 91 FIXTURE_TEARDOWN(vfio_pci_driver_test) 92 { 93 struct vfio_pci_driver *driver = &self->device->driver; 94 95 vfio_pci_driver_remove(self->device); 96 97 region_teardown(self->device, &self->memcpy_region); 98 region_teardown(self->device, &driver->region); 99 100 vfio_pci_device_cleanup(self->device); 101 } 102 103 TEST_F(vfio_pci_driver_test, init_remove) 104 { 105 int i; 106 107 for (i = 0; i < 10; i++) { 108 vfio_pci_driver_remove(self->device); 109 vfio_pci_driver_init(self->device); 110 } 111 } 112 113 TEST_F(vfio_pci_driver_test, memcpy_success) 114 { 115 fcntl_set_nonblock(self->msi_fd); 116 117 memset(self->src, 'x', self->size); 118 memset(self->dst, 'y', self->size); 119 120 ASSERT_EQ(0, vfio_pci_driver_memcpy(self->device, 121 self->src_iova, 122 self->dst_iova, 123 self->size)); 124 125 ASSERT_EQ(0, memcmp(self->src, self->dst, self->size)); 126 ASSERT_NO_MSI(self->msi_fd); 127 } 128 129 TEST_F(vfio_pci_driver_test, memcpy_from_unmapped_iova) 130 { 131 fcntl_set_nonblock(self->msi_fd); 132 133 /* 134 * Ignore the return value since not all devices will detect and report 135 * accesses to unmapped IOVAs as errors. 136 */ 137 vfio_pci_driver_memcpy(self->device, self->unmapped_iova, 138 self->dst_iova, self->size); 139 140 ASSERT_NO_MSI(self->msi_fd); 141 } 142 143 TEST_F(vfio_pci_driver_test, memcpy_to_unmapped_iova) 144 { 145 fcntl_set_nonblock(self->msi_fd); 146 147 /* 148 * Ignore the return value since not all devices will detect and report 149 * accesses to unmapped IOVAs as errors. 150 */ 151 vfio_pci_driver_memcpy(self->device, self->src_iova, 152 self->unmapped_iova, self->size); 153 154 ASSERT_NO_MSI(self->msi_fd); 155 } 156 157 TEST_F(vfio_pci_driver_test, send_msi) 158 { 159 u64 value; 160 161 vfio_pci_driver_send_msi(self->device); 162 ASSERT_EQ(8, read(self->msi_fd, &value, 8)); 163 ASSERT_EQ(1, value); 164 } 165 166 TEST_F(vfio_pci_driver_test, mix_and_match) 167 { 168 u64 value; 169 int i; 170 171 for (i = 0; i < 10; i++) { 172 memset(self->src, 'x', self->size); 173 memset(self->dst, 'y', self->size); 174 175 ASSERT_EQ(0, vfio_pci_driver_memcpy(self->device, 176 self->src_iova, 177 self->dst_iova, 178 self->size)); 179 180 ASSERT_EQ(0, memcmp(self->src, self->dst, self->size)); 181 182 vfio_pci_driver_memcpy(self->device, 183 self->unmapped_iova, 184 self->dst_iova, 185 self->size); 186 187 vfio_pci_driver_send_msi(self->device); 188 ASSERT_EQ(8, read(self->msi_fd, &value, 8)); 189 ASSERT_EQ(1, value); 190 } 191 } 192 193 TEST_F_TIMEOUT(vfio_pci_driver_test, memcpy_storm, 60) 194 { 195 struct vfio_pci_driver *driver = &self->device->driver; 196 u64 total_size; 197 u64 count; 198 199 fcntl_set_nonblock(self->msi_fd); 200 201 /* 202 * Perform up to 250GiB worth of DMA reads and writes across several 203 * memcpy operations. Some devices can support even more but the test 204 * will take too long. 205 */ 206 total_size = 250UL * SZ_1G; 207 count = min(total_size / self->size, driver->max_memcpy_count); 208 209 printf("Kicking off %lu memcpys of size 0x%lx\n", count, self->size); 210 vfio_pci_driver_memcpy_start(self->device, 211 self->src_iova, 212 self->dst_iova, 213 self->size, count); 214 215 ASSERT_EQ(0, vfio_pci_driver_memcpy_wait(self->device)); 216 ASSERT_NO_MSI(self->msi_fd); 217 } 218 219 int main(int argc, char *argv[]) 220 { 221 struct vfio_pci_device *device; 222 223 device_bdf = vfio_selftests_get_bdf(&argc, argv); 224 225 device = vfio_pci_device_init(device_bdf, VFIO_TYPE1_IOMMU); 226 if (!device->driver.ops) { 227 fprintf(stderr, "No driver found for device %s\n", device_bdf); 228 return KSFT_SKIP; 229 } 230 vfio_pci_device_cleanup(device); 231 232 return test_harness_run(argc, argv); 233 } 234