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4e53f78e MT |
1 | #define _GNU_SOURCE |
2 | #include <getopt.h> | |
3 | #include <string.h> | |
4 | #include <poll.h> | |
5 | #include <sys/eventfd.h> | |
6 | #include <stdlib.h> | |
7 | #include <assert.h> | |
8 | #include <unistd.h> | |
9 | #include <sys/ioctl.h> | |
10 | #include <sys/stat.h> | |
11 | #include <sys/types.h> | |
12 | #include <fcntl.h> | |
13 | #include <linux/vhost.h> | |
14 | #include <linux/virtio.h> | |
15 | #include <linux/virtio_ring.h> | |
16 | #include "../../drivers/vhost/test.h" | |
17 | ||
18 | struct vq_info { | |
19 | int kick; | |
20 | int call; | |
21 | int num; | |
22 | int idx; | |
23 | void *ring; | |
24 | /* copy used for control */ | |
25 | struct vring vring; | |
26 | struct virtqueue *vq; | |
27 | }; | |
28 | ||
29 | struct vdev_info { | |
30 | struct virtio_device vdev; | |
31 | int control; | |
32 | struct pollfd fds[1]; | |
33 | struct vq_info vqs[1]; | |
34 | int nvqs; | |
35 | void *buf; | |
36 | size_t buf_size; | |
37 | struct vhost_memory *mem; | |
38 | }; | |
39 | ||
40 | void vq_notify(struct virtqueue *vq) | |
41 | { | |
42 | struct vq_info *info = vq->priv; | |
43 | unsigned long long v = 1; | |
44 | int r; | |
45 | r = write(info->kick, &v, sizeof v); | |
46 | assert(r == sizeof v); | |
47 | } | |
48 | ||
49 | void vq_callback(struct virtqueue *vq) | |
50 | { | |
51 | } | |
52 | ||
53 | ||
54 | void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info) | |
55 | { | |
56 | struct vhost_vring_state state = { .index = info->idx }; | |
57 | struct vhost_vring_file file = { .index = info->idx }; | |
58 | unsigned long long features = dev->vdev.features[0]; | |
59 | struct vhost_vring_addr addr = { | |
60 | .index = info->idx, | |
61 | .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc, | |
62 | .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail, | |
63 | .used_user_addr = (uint64_t)(unsigned long)info->vring.used, | |
64 | }; | |
65 | int r; | |
66 | r = ioctl(dev->control, VHOST_SET_FEATURES, &features); | |
67 | assert(r >= 0); | |
68 | state.num = info->vring.num; | |
69 | r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); | |
70 | assert(r >= 0); | |
71 | state.num = 0; | |
72 | r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); | |
73 | assert(r >= 0); | |
74 | r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr); | |
75 | assert(r >= 0); | |
76 | file.fd = info->kick; | |
77 | r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); | |
78 | assert(r >= 0); | |
79 | file.fd = info->call; | |
80 | r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); | |
81 | assert(r >= 0); | |
82 | } | |
83 | ||
84 | static void vq_info_add(struct vdev_info *dev, int num) | |
85 | { | |
86 | struct vq_info *info = &dev->vqs[dev->nvqs]; | |
87 | int r; | |
88 | info->idx = dev->nvqs; | |
89 | info->kick = eventfd(0, EFD_NONBLOCK); | |
90 | info->call = eventfd(0, EFD_NONBLOCK); | |
91 | r = posix_memalign(&info->ring, 4096, vring_size(num, 4096)); | |
92 | assert(r >= 0); | |
93 | memset(info->ring, 0, vring_size(num, 4096)); | |
94 | vring_init(&info->vring, num, info->ring, 4096); | |
7b21e34f RR |
95 | info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev, |
96 | true, info->ring, | |
4e53f78e MT |
97 | vq_notify, vq_callback, "test"); |
98 | assert(info->vq); | |
99 | info->vq->priv = info; | |
100 | vhost_vq_setup(dev, info); | |
101 | dev->fds[info->idx].fd = info->call; | |
102 | dev->fds[info->idx].events = POLLIN; | |
103 | dev->nvqs++; | |
104 | } | |
105 | ||
106 | static void vdev_info_init(struct vdev_info* dev, unsigned long long features) | |
107 | { | |
108 | int r; | |
109 | memset(dev, 0, sizeof *dev); | |
110 | dev->vdev.features[0] = features; | |
111 | dev->vdev.features[1] = features >> 32; | |
112 | dev->buf_size = 1024; | |
113 | dev->buf = malloc(dev->buf_size); | |
114 | assert(dev->buf); | |
115 | dev->control = open("/dev/vhost-test", O_RDWR); | |
116 | assert(dev->control >= 0); | |
117 | r = ioctl(dev->control, VHOST_SET_OWNER, NULL); | |
118 | assert(r >= 0); | |
119 | dev->mem = malloc(offsetof(struct vhost_memory, regions) + | |
120 | sizeof dev->mem->regions[0]); | |
121 | assert(dev->mem); | |
122 | memset(dev->mem, 0, offsetof(struct vhost_memory, regions) + | |
123 | sizeof dev->mem->regions[0]); | |
124 | dev->mem->nregions = 1; | |
125 | dev->mem->regions[0].guest_phys_addr = (long)dev->buf; | |
126 | dev->mem->regions[0].userspace_addr = (long)dev->buf; | |
127 | dev->mem->regions[0].memory_size = dev->buf_size; | |
128 | r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); | |
129 | assert(r >= 0); | |
130 | } | |
131 | ||
132 | /* TODO: this is pretty bad: we get a cache line bounce | |
133 | * for the wait queue on poll and another one on read, | |
134 | * plus the read which is there just to clear the | |
135 | * current state. */ | |
136 | static void wait_for_interrupt(struct vdev_info *dev) | |
137 | { | |
138 | int i; | |
139 | unsigned long long val; | |
140 | poll(dev->fds, dev->nvqs, -1); | |
141 | for (i = 0; i < dev->nvqs; ++i) | |
142 | if (dev->fds[i].revents & POLLIN) { | |
143 | read(dev->fds[i].fd, &val, sizeof val); | |
144 | } | |
145 | } | |
146 | ||
64d09888 MT |
147 | static void run_test(struct vdev_info *dev, struct vq_info *vq, |
148 | bool delayed, int bufs) | |
4e53f78e MT |
149 | { |
150 | struct scatterlist sl; | |
151 | long started = 0, completed = 0; | |
152 | long completed_before; | |
153 | int r, test = 1; | |
154 | unsigned len; | |
155 | long long spurious = 0; | |
156 | r = ioctl(dev->control, VHOST_TEST_RUN, &test); | |
157 | assert(r >= 0); | |
158 | for (;;) { | |
159 | virtqueue_disable_cb(vq->vq); | |
160 | completed_before = completed; | |
161 | do { | |
162 | if (started < bufs) { | |
163 | sg_init_one(&sl, dev->buf, dev->buf_size); | |
164 | r = virtqueue_add_buf(vq->vq, &sl, 1, 0, | |
f96fde41 RR |
165 | dev->buf + started, |
166 | GFP_ATOMIC); | |
de929b04 | 167 | if (likely(r == 0)) { |
4e53f78e MT |
168 | ++started; |
169 | virtqueue_kick(vq->vq); | |
170 | } | |
171 | } else | |
172 | r = -1; | |
173 | ||
174 | /* Flush out completed bufs if any */ | |
175 | if (virtqueue_get_buf(vq->vq, &len)) { | |
176 | ++completed; | |
177 | r = 0; | |
178 | } | |
179 | ||
de929b04 | 180 | } while (r == 0); |
4e53f78e MT |
181 | if (completed == completed_before) |
182 | ++spurious; | |
183 | assert(completed <= bufs); | |
184 | assert(started <= bufs); | |
185 | if (completed == bufs) | |
186 | break; | |
64d09888 MT |
187 | if (delayed) { |
188 | if (virtqueue_enable_cb_delayed(vq->vq)) | |
189 | wait_for_interrupt(dev); | |
190 | } else { | |
191 | if (virtqueue_enable_cb(vq->vq)) | |
192 | wait_for_interrupt(dev); | |
4e53f78e MT |
193 | } |
194 | } | |
195 | test = 0; | |
196 | r = ioctl(dev->control, VHOST_TEST_RUN, &test); | |
197 | assert(r >= 0); | |
198 | fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious); | |
199 | } | |
200 | ||
201 | const char optstring[] = "h"; | |
202 | const struct option longopts[] = { | |
203 | { | |
204 | .name = "help", | |
205 | .val = 'h', | |
206 | }, | |
4423fe40 MT |
207 | { |
208 | .name = "event-idx", | |
209 | .val = 'E', | |
210 | }, | |
211 | { | |
212 | .name = "no-event-idx", | |
213 | .val = 'e', | |
214 | }, | |
4e53f78e MT |
215 | { |
216 | .name = "indirect", | |
217 | .val = 'I', | |
218 | }, | |
219 | { | |
220 | .name = "no-indirect", | |
221 | .val = 'i', | |
222 | }, | |
64d09888 MT |
223 | { |
224 | .name = "delayed-interrupt", | |
225 | .val = 'D', | |
226 | }, | |
227 | { | |
228 | .name = "no-delayed-interrupt", | |
229 | .val = 'd', | |
230 | }, | |
4e53f78e MT |
231 | { |
232 | } | |
233 | }; | |
234 | ||
4a7d6455 | 235 | static void help(void) |
4e53f78e | 236 | { |
4423fe40 MT |
237 | fprintf(stderr, "Usage: virtio_test [--help]" |
238 | " [--no-indirect]" | |
239 | " [--no-event-idx]" | |
64d09888 | 240 | " [--delayed-interrupt]" |
4423fe40 | 241 | "\n"); |
4e53f78e MT |
242 | } |
243 | ||
244 | int main(int argc, char **argv) | |
245 | { | |
246 | struct vdev_info dev; | |
4423fe40 MT |
247 | unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | |
248 | (1ULL << VIRTIO_RING_F_EVENT_IDX); | |
4e53f78e | 249 | int o; |
64d09888 | 250 | bool delayed = false; |
4e53f78e MT |
251 | |
252 | for (;;) { | |
253 | o = getopt_long(argc, argv, optstring, longopts, NULL); | |
254 | switch (o) { | |
255 | case -1: | |
256 | goto done; | |
257 | case '?': | |
258 | help(); | |
259 | exit(2); | |
4423fe40 MT |
260 | case 'e': |
261 | features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX); | |
262 | break; | |
4e53f78e MT |
263 | case 'h': |
264 | help(); | |
265 | goto done; | |
266 | case 'i': | |
267 | features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC); | |
268 | break; | |
64d09888 MT |
269 | case 'D': |
270 | delayed = true; | |
271 | break; | |
4e53f78e MT |
272 | default: |
273 | assert(0); | |
274 | break; | |
275 | } | |
276 | } | |
277 | ||
278 | done: | |
279 | vdev_info_init(&dev, features); | |
280 | vq_info_add(&dev, 256); | |
64d09888 | 281 | run_test(&dev, &dev.vqs[0], delayed, 0x100000); |
4e53f78e MT |
282 | return 0; |
283 | } |