1 // SPDX-License-Identifier: GPL-2.0
2 #define _GNU_SOURCE
3 #include <getopt.h>
4 #include <limits.h>
5 #include <string.h>
6 #include <poll.h>
7 #include <sys/eventfd.h>
8 #include <stdlib.h>
9 #include <assert.h>
10 #include <unistd.h>
11 #include <sys/ioctl.h>
12 #include <sys/stat.h>
13 #include <sys/types.h>
14 #include <fcntl.h>
15 #include <stdbool.h>
16 #include <linux/virtio_types.h>
17 #include <linux/vhost.h>
18 #include <linux/virtio.h>
19 #include <linux/virtio_ring.h>
20 #include "../../drivers/vhost/test.h"
21
22 #define RANDOM_BATCH -1
23
24 /* Unused */
25 void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
26
27 struct vq_info {
28 int kick;
29 int call;
30 int num;
31 int idx;
32 void *ring;
33 /* copy used for control */
34 struct vring vring;
35 struct virtqueue *vq;
36 };
37
38 struct vdev_info {
39 struct virtio_device vdev;
40 int control;
41 struct pollfd fds[1];
42 struct vq_info vqs[1];
43 int nvqs;
44 void *buf;
45 size_t buf_size;
46 struct vhost_memory *mem;
47 };
48
49 static const struct vhost_vring_file no_backend = { .fd = -1 },
50 backend = { .fd = 1 };
51 static const struct vhost_vring_state null_state = {};
52
53 bool vq_notify(struct virtqueue *vq)
54 {
55 struct vq_info *info = vq->priv;
56 unsigned long long v = 1;
57 int r;
58 r = write(info->kick, &v, sizeof v);
59 assert(r == sizeof v);
60 return true;
61 }
62
63 void vq_callback(struct virtqueue *vq)
64 {
65 }
66
67
68 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
69 {
70 struct vhost_vring_state state = { .index = info->idx };
71 struct vhost_vring_file file = { .index = info->idx };
72 unsigned long long features = dev->vdev.features;
73 struct vhost_vring_addr addr = {
74 .index = info->idx,
75 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
76 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
77 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
78 };
79 int r;
80 r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
81 assert(r >= 0);
82 state.num = info->vring.num;
83 r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
84 assert(r >= 0);
85 state.num = 0;
86 r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
87 assert(r >= 0);
88 r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
89 assert(r >= 0);
90 file.fd = info->kick;
91 r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
92 assert(r >= 0);
93 file.fd = info->call;
94 r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
95 assert(r >= 0);
96 }
97
98 static void vq_reset(struct vq_info *info, int num, struct virtio_device *vdev)
99 {
100 if (info->vq)
101 vring_del_virtqueue(info->vq);
102
103 memset(info->ring, 0, vring_size(num, 4096));
104 vring_init(&info->vring, num, info->ring, 4096);
105 info->vq = vring_new_virtqueue(info->idx, num, 4096, vdev, true, false,
106 info->ring, vq_notify, vq_callback, "test");
107 assert(info->vq);
108 info->vq->priv = info;
109 }
110
111 static void vq_info_add(struct vdev_info *dev, int num)
112 {
113 struct vq_info *info = &dev->vqs[dev->nvqs];
114 int r;
115 info->idx = dev->nvqs;
116 info->kick = eventfd(0, EFD_NONBLOCK);
117 info->call = eventfd(0, EFD_NONBLOCK);
118 r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
119 assert(r >= 0);
120 vq_reset(info, num, &dev->vdev);
121 vhost_vq_setup(dev, info);
122 dev->fds[info->idx].fd = info->call;
123 dev->fds[info->idx].events = POLLIN;
124 dev->nvqs++;
125 }
126
127 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
128 {
129 int r;
130 memset(dev, 0, sizeof *dev);
131 dev->vdev.features = features;
132 INIT_LIST_HEAD(&dev->vdev.vqs);
133 spin_lock_init(&dev->vdev.vqs_list_lock);
134 dev->buf_size = 1024;
135 dev->buf = malloc(dev->buf_size);
136 assert(dev->buf);
137 dev->control = open("/dev/vhost-test", O_RDWR);
138 assert(dev->control >= 0);
139 r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
140 assert(r >= 0);
141 dev->mem = malloc(offsetof(struct vhost_memory, regions) +
142 sizeof dev->mem->regions[0]);
143 assert(dev->mem);
144 memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
145 sizeof dev->mem->regions[0]);
146 dev->mem->nregions = 1;
147 dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
148 dev->mem->regions[0].userspace_addr = (long)dev->buf;
149 dev->mem->regions[0].memory_size = dev->buf_size;
150 r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
151 assert(r >= 0);
152 }
153
154 /* TODO: this is pretty bad: we get a cache line bounce
155 * for the wait queue on poll and another one on read,
156 * plus the read which is there just to clear the
157 * current state. */
158 static void wait_for_interrupt(struct vdev_info *dev)
159 {
160 int i;
161 unsigned long long val;
162 poll(dev->fds, dev->nvqs, -1);
163 for (i = 0; i < dev->nvqs; ++i)
164 if (dev->fds[i].revents & POLLIN) {
165 read(dev->fds[i].fd, &val, sizeof val);
166 }
167 }
168
169 static void run_test(struct vdev_info *dev, struct vq_info *vq,
170 bool delayed, int batch, int reset_n, int bufs)
171 {
172 struct scatterlist sl;
173 long started = 0, completed = 0, next_reset = reset_n;
174 long completed_before, started_before;
175 int r, test = 1;
176 unsigned int len;
177 long long spurious = 0;
178 const bool random_batch = batch == RANDOM_BATCH;
179
180 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
181 assert(r >= 0);
182 if (!reset_n) {
183 next_reset = INT_MAX;
184 }
185
186 for (;;) {
187 virtqueue_disable_cb(vq->vq);
188 completed_before = completed;
189 started_before = started;
190 do {
191 const bool reset = completed > next_reset;
192 if (random_batch)
193 batch = (random() % vq->vring.num) + 1;
194
195 while (started < bufs &&
196 (started - completed) < batch) {
197 sg_init_one(&sl, dev->buf, dev->buf_size);
198 r = virtqueue_add_outbuf(vq->vq, &sl, 1,
199 dev->buf + started,
200 GFP_ATOMIC);
201 if (unlikely(r != 0)) {
202 if (r == -ENOSPC &&
203 started > started_before)
204 r = 0;
205 else
206 r = -1;
207 break;
208 }
209
210 ++started;
211
212 if (unlikely(!virtqueue_kick(vq->vq))) {
213 r = -1;
214 break;
215 }
216 }
217
218 if (started >= bufs)
219 r = -1;
220
221 if (reset) {
222 r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
223 &no_backend);
224 assert(!r);
225 }
226
227 /* Flush out completed bufs if any */
228 while (virtqueue_get_buf(vq->vq, &len)) {
229 ++completed;
230 r = 0;
231 }
232
233 if (reset) {
234 struct vhost_vring_state s = { .index = 0 };
235
236 vq_reset(vq, vq->vring.num, &dev->vdev);
237
238 r = ioctl(dev->control, VHOST_GET_VRING_BASE,
239 &s);
240 assert(!r);
241
242 s.num = 0;
243 r = ioctl(dev->control, VHOST_SET_VRING_BASE,
244 &null_state);
245 assert(!r);
246
247 r = ioctl(dev->control, VHOST_TEST_SET_BACKEND,
248 &backend);
249 assert(!r);
250
251 started = completed;
252 while (completed > next_reset)
253 next_reset += completed;
254 }
255 } while (r == 0);
256 if (completed == completed_before && started == started_before)
257 ++spurious;
258 assert(completed <= bufs);
259 assert(started <= bufs);
260 if (completed == bufs)
261 break;
262 if (delayed) {
263 if (virtqueue_enable_cb_delayed(vq->vq))
264 wait_for_interrupt(dev);
265 } else {
266 if (virtqueue_enable_cb(vq->vq))
267 wait_for_interrupt(dev);
268 }
269 }
270 test = 0;
271 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
272 assert(r >= 0);
273 fprintf(stderr,
274 "spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n",
275 spurious, started, completed);
276 }
277
278 const char optstring[] = "h";
279 const struct option longopts[] = {
280 {
281 .name = "help",
282 .val = 'h',
283 },
284 {
285 .name = "event-idx",
286 .val = 'E',
287 },
288 {
289 .name = "no-event-idx",
290 .val = 'e',
291 },
292 {
293 .name = "indirect",
294 .val = 'I',
295 },
296 {
297 .name = "no-indirect",
298 .val = 'i',
299 },
300 {
301 .name = "virtio-1",
302 .val = '1',
303 },
304 {
305 .name = "no-virtio-1",
306 .val = '',
307 },
308 {
309 .name = "delayed-interrupt",
310 .val = 'D',
311 },
312 {
313 .name = "no-delayed-interrupt",
314 .val = 'd',
315 },
316 {
317 .name = "batch",
318 .val = 'b',
319 .has_arg = required_argument,
320 },
321 {
322 .name = "reset",
323 .val = 'r',
324 .has_arg = optional_argument,
325 },
326 {
327 }
328 };
329
330 static void help(int status)
331 {
332 fprintf(stderr, "Usage: virtio_test [--help]"
333 " [--no-indirect]"
334 " [--no-event-idx]"
335 " [--no-virtio-1]"
336 " [--delayed-interrupt]"
337 " [--batch=random/N]"
338 " [--reset=N]"
339 "\n");
340
341 exit(status);
342 }
343
344 int main(int argc, char **argv)
345 {
346 struct vdev_info dev;
347 unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
348 (1ULL << VIRTIO_RING_F_EVENT_IDX) | (1ULL << VIRTIO_F_VERSION_1);
349 long batch = 1, reset = 0;
350 int o;
351 bool delayed = false;
352
353 for (;;) {
354 o = getopt_long(argc, argv, optstring, longopts, NULL);
355 switch (o) {
356 case -1:
357 goto done;
358 case '?':
359 help(2);
360 case 'e':
361 features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
362 break;
363 case 'h':
364 help(0);
365 case 'i':
366 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
367 break;
368 case '':
369 features &= ~(1ULL << VIRTIO_F_VERSION_1);
370 break;
371 case 'D':
372 delayed = true;
373 break;
374 case 'b':
375 if (0 == strcmp(optarg, "random")) {
376 batch = RANDOM_BATCH;
377 } else {
378 batch = strtol(optarg, NULL, 10);
379 assert(batch > 0);
380 assert(batch < (long)INT_MAX + 1);
381 }
382 break;
383 case 'r':
384 if (!optarg) {
385 reset = 1;
386 } else {
387 reset = strtol(optarg, NULL, 10);
388 assert(reset > 0);
389 assert(reset < (long)INT_MAX + 1);
390 }
391 break;
392 default:
393 assert(0);
394 break;
395 }
396 }
397
398 done:
399 vdev_info_init(&dev, features);
400 vq_info_add(&dev, 256);
401 run_test(&dev, &dev.vqs[0], delayed, batch, reset, 0x100000);
402 return 0;
403 }
404
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