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
region_setup(struct vfio_pci_device * device,struct iova_allocator * iova_allocator,struct vfio_dma_region * region,u64 size)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
region_teardown(struct vfio_pci_device * device,struct vfio_dma_region * region)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
FIXTURE(vfio_pci_driver_test)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
FIXTURE_VARIANT(vfio_pci_driver_test)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
FIXTURE_SETUP(vfio_pci_driver_test)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
FIXTURE_TEARDOWN(vfio_pci_driver_test)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
TEST_F(vfio_pci_driver_test,init_remove)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
TEST_F(vfio_pci_driver_test,memcpy_success)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
TEST_F(vfio_pci_driver_test,memcpy_from_unmapped_iova)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
TEST_F(vfio_pci_driver_test,memcpy_to_unmapped_iova)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
TEST_F(vfio_pci_driver_test,send_msi)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
TEST_F(vfio_pci_driver_test,mix_and_match)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
main(int argc,char * argv[])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