tools/virtio: fix build for 3.8
[linux-3.10.git] / tools / virtio / virtio_test.c
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);
95         info->vq = vring_new_virtqueue(info->idx,
96                                        info->vring.num, 4096, &dev->vdev,
97                                        true, info->ring,
98                                        vq_notify, vq_callback, "test");
99         assert(info->vq);
100         info->vq->priv = info;
101         vhost_vq_setup(dev, info);
102         dev->fds[info->idx].fd = info->call;
103         dev->fds[info->idx].events = POLLIN;
104         dev->nvqs++;
105 }
106
107 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
108 {
109         int r;
110         memset(dev, 0, sizeof *dev);
111         dev->vdev.features[0] = features;
112         dev->vdev.features[1] = features >> 32;
113         dev->buf_size = 1024;
114         dev->buf = malloc(dev->buf_size);
115         assert(dev->buf);
116         dev->control = open("/dev/vhost-test", O_RDWR);
117         assert(dev->control >= 0);
118         r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
119         assert(r >= 0);
120         dev->mem = malloc(offsetof(struct vhost_memory, regions) +
121                           sizeof dev->mem->regions[0]);
122         assert(dev->mem);
123         memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
124                           sizeof dev->mem->regions[0]);
125         dev->mem->nregions = 1;
126         dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
127         dev->mem->regions[0].userspace_addr = (long)dev->buf;
128         dev->mem->regions[0].memory_size = dev->buf_size;
129         r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
130         assert(r >= 0);
131 }
132
133 /* TODO: this is pretty bad: we get a cache line bounce
134  * for the wait queue on poll and another one on read,
135  * plus the read which is there just to clear the
136  * current state. */
137 static void wait_for_interrupt(struct vdev_info *dev)
138 {
139         int i;
140         unsigned long long val;
141         poll(dev->fds, dev->nvqs, -1);
142         for (i = 0; i < dev->nvqs; ++i)
143                 if (dev->fds[i].revents & POLLIN) {
144                         read(dev->fds[i].fd, &val, sizeof val);
145                 }
146 }
147
148 static void run_test(struct vdev_info *dev, struct vq_info *vq,
149                      bool delayed, int bufs)
150 {
151         struct scatterlist sl;
152         long started = 0, completed = 0;
153         long completed_before;
154         int r, test = 1;
155         unsigned len;
156         long long spurious = 0;
157         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
158         assert(r >= 0);
159         for (;;) {
160                 virtqueue_disable_cb(vq->vq);
161                 completed_before = completed;
162                 do {
163                         if (started < bufs) {
164                                 sg_init_one(&sl, dev->buf, dev->buf_size);
165                                 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
166                                                       dev->buf + started,
167                                                       GFP_ATOMIC);
168                                 if (likely(r == 0)) {
169                                         ++started;
170                                         virtqueue_kick(vq->vq);
171                                 }
172                         } else
173                                 r = -1;
174
175                         /* Flush out completed bufs if any */
176                         if (virtqueue_get_buf(vq->vq, &len)) {
177                                 ++completed;
178                                 r = 0;
179                         }
180
181                 } while (r == 0);
182                 if (completed == completed_before)
183                         ++spurious;
184                 assert(completed <= bufs);
185                 assert(started <= bufs);
186                 if (completed == bufs)
187                         break;
188                 if (delayed) {
189                         if (virtqueue_enable_cb_delayed(vq->vq))
190                                 wait_for_interrupt(dev);
191                 } else {
192                         if (virtqueue_enable_cb(vq->vq))
193                                 wait_for_interrupt(dev);
194                 }
195         }
196         test = 0;
197         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
198         assert(r >= 0);
199         fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
200 }
201
202 const char optstring[] = "h";
203 const struct option longopts[] = {
204         {
205                 .name = "help",
206                 .val = 'h',
207         },
208         {
209                 .name = "event-idx",
210                 .val = 'E',
211         },
212         {
213                 .name = "no-event-idx",
214                 .val = 'e',
215         },
216         {
217                 .name = "indirect",
218                 .val = 'I',
219         },
220         {
221                 .name = "no-indirect",
222                 .val = 'i',
223         },
224         {
225                 .name = "delayed-interrupt",
226                 .val = 'D',
227         },
228         {
229                 .name = "no-delayed-interrupt",
230                 .val = 'd',
231         },
232         {
233         }
234 };
235
236 static void help(void)
237 {
238         fprintf(stderr, "Usage: virtio_test [--help]"
239                 " [--no-indirect]"
240                 " [--no-event-idx]"
241                 " [--delayed-interrupt]"
242                 "\n");
243 }
244
245 int main(int argc, char **argv)
246 {
247         struct vdev_info dev;
248         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
249                 (1ULL << VIRTIO_RING_F_EVENT_IDX);
250         int o;
251         bool delayed = false;
252
253         for (;;) {
254                 o = getopt_long(argc, argv, optstring, longopts, NULL);
255                 switch (o) {
256                 case -1:
257                         goto done;
258                 case '?':
259                         help();
260                         exit(2);
261                 case 'e':
262                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
263                         break;
264                 case 'h':
265                         help();
266                         goto done;
267                 case 'i':
268                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
269                         break;
270                 case 'D':
271                         delayed = true;
272                         break;
273                 default:
274                         assert(0);
275                         break;
276                 }
277         }
278
279 done:
280         vdev_info_init(&dev, features);
281         vq_info_add(&dev, 256);
282         run_test(&dev, &dev.vqs[0], delayed, 0x100000);
283         return 0;
284 }