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 <stdbool.h>
  14 #include <linux/vhost.h>
  15 #include <linux/virtio.h>
  16 #include <linux/virtio_ring.h>
  17 #include "../../drivers/vhost/test.h"
  18
  19 /* Unused */
  20 void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
  21
  22 struct vq_info {
  23         int kick;
  24         int call;
  25         int num;
  26         int idx;
  27         void *ring;
  28         /* copy used for control */
  29         struct vring vring;
  30         struct virtqueue *vq;
  31 };
  32
  33 struct vdev_info {
  34         struct virtio_device vdev;
  35         int control;
  36         struct pollfd fds[1];
  37         struct vq_info vqs[1];
  38         int nvqs;
  39         void *buf;
  40         size_t buf_size;
  41         struct vhost_memory *mem;
  42 };
  43
  44 void vq_notify(struct virtqueue *vq)
  45 {
  46         struct vq_info *info = vq->priv;
  47         unsigned long long v = 1;
  48         int r;
  49         r = write(info->kick, &v, sizeof v);
  50         assert(r == sizeof v);
  51 }
  52
  53 void vq_callback(struct virtqueue *vq)
  54 {
  55 }
  56
  57
  58 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
  59 {
  60         struct vhost_vring_state state = { .index = info->idx };
  61         struct vhost_vring_file file = { .index = info->idx };
  62         unsigned long long features = dev->vdev.features[0];
  63         struct vhost_vring_addr addr = {
  64                 .index = info->idx,
  65                 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
  66                 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
  67                 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
  68         };
  69         int r;
  70         r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
  71         assert(r >= 0);
  72         state.num = info->vring.num;
  73         r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
  74         assert(r >= 0);
  75         state.num = 0;
  76         r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
  77         assert(r >= 0);
  78         r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
  79         assert(r >= 0);
  80         file.fd = info->kick;
  81         r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
  82         assert(r >= 0);
  83         file.fd = info->call;
  84         r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
  85         assert(r >= 0);
  86 }
  87
  88 static void vq_info_add(struct vdev_info *dev, int num)
  89 {
  90         struct vq_info *info = &dev->vqs[dev->nvqs];
  91         int r;
  92         info->idx = dev->nvqs;
  93         info->kick = eventfd(0, EFD_NONBLOCK);
  94         info->call = eventfd(0, EFD_NONBLOCK);
  95         r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
  96         assert(r >= 0);
  97         memset(info->ring, 0, vring_size(num, 4096));
  98         vring_init(&info->vring, num, info->ring, 4096);
  99         info->vq = vring_new_virtqueue(info->idx,
 100                                        info->vring.num, 4096, &dev->vdev,
 101                                        true, info->ring,
 102                                        vq_notify, vq_callback, "test");
 103         assert(info->vq);
 104         info->vq->priv = info;
 105         vhost_vq_setup(dev, info);
 106         dev->fds[info->idx].fd = info->call;
 107         dev->fds[info->idx].events = POLLIN;
 108         dev->nvqs++;
 109 }
 110
 111 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
 112 {
 113         int r;
 114         memset(dev, 0, sizeof *dev);
 115         dev->vdev.features[0] = features;
 116         dev->vdev.features[1] = features >> 32;
 117         dev->buf_size = 1024;
 118         dev->buf = malloc(dev->buf_size);
 119         assert(dev->buf);
 120         dev->control = open("/dev/vhost-test", O_RDWR);
 121         assert(dev->control >= 0);
 122         r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
 123         assert(r >= 0);
 124         dev->mem = malloc(offsetof(struct vhost_memory, regions) +
 125                           sizeof dev->mem->regions[0]);
 126         assert(dev->mem);
 127         memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
 128                           sizeof dev->mem->regions[0]);
 129         dev->mem->nregions = 1;
 130         dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
 131         dev->mem->regions[0].userspace_addr = (long)dev->buf;
 132         dev->mem->regions[0].memory_size = dev->buf_size;
 133         r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
 134         assert(r >= 0);
 135 }
 136
 137 /* TODO: this is pretty bad: we get a cache line bounce
 138  * for the wait queue on poll and another one on read,
 139  * plus the read which is there just to clear the
 140  * current state. */
 141 static void wait_for_interrupt(struct vdev_info *dev)
 142 {
 143         int i;
 144         unsigned long long val;
 145         poll(dev->fds, dev->nvqs, -1);
 146         for (i = 0; i < dev->nvqs; ++i)
 147                 if (dev->fds[i].revents & POLLIN) {
 148                         read(dev->fds[i].fd, &val, sizeof val);
 149                 }
 150 }
 151
 152 static void run_test(struct vdev_info *dev, struct vq_info *vq,
 153                      bool delayed, int bufs)
 154 {
 155         struct scatterlist sl;
 156         long started = 0, completed = 0;
 157         long completed_before;
 158         int r, test = 1;
 159         unsigned len;
 160         long long spurious = 0;
 161         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 162         assert(r >= 0);
 163         for (;;) {
 164                 virtqueue_disable_cb(vq->vq);
 165                 completed_before = completed;
 166                 do {
 167                         if (started < bufs) {
 168                                 sg_init_one(&sl, dev->buf, dev->buf_size);
 169                                 r = virtqueue_add_outbuf(vq->vq, &sl, 1,
 170                                                          dev->buf + started,
 171                                                          GFP_ATOMIC);
 172                                 if (likely(r == 0)) {
 173                                         ++started;
 174                                         virtqueue_kick(vq->vq);
 175                                 }
 176                         } else
 177                                 r = -1;
 178
 179                         /* Flush out completed bufs if any */
 180                         if (virtqueue_get_buf(vq->vq, &len)) {
 181                                 ++completed;
 182                                 r = 0;
 183                         }
 184
 185                 } while (r == 0);
 186                 if (completed == completed_before)
 187                         ++spurious;
 188                 assert(completed <= bufs);
 189                 assert(started <= bufs);
 190                 if (completed == bufs)
 191                         break;
 192                 if (delayed) {
 193                         if (virtqueue_enable_cb_delayed(vq->vq))
 194                                 wait_for_interrupt(dev);
 195                 } else {
 196                         if (virtqueue_enable_cb(vq->vq))
 197                                 wait_for_interrupt(dev);
 198                 }
 199         }
 200         test = 0;
 201         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 202         assert(r >= 0);
 203         fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
 204 }
 205
 206 const char optstring[] = "h";
 207 const struct option longopts[] = {
 208         {
 209                 .name = "help",
 210                 .val = 'h',
 211         },
 212         {
 213                 .name = "event-idx",
 214                 .val = 'E',
 215         },
 216         {
 217                 .name = "no-event-idx",
 218                 .val = 'e',
 219         },
 220         {
 221                 .name = "indirect",
 222                 .val = 'I',
 223         },
 224         {
 225                 .name = "no-indirect",
 226                 .val = 'i',
 227         },
 228         {
 229                 .name = "delayed-interrupt",
 230                 .val = 'D',
 231         },
 232         {
 233                 .name = "no-delayed-interrupt",
 234                 .val = 'd',
 235         },
 236         {
 237         }
 238 };
 239
 240 static void help(void)
 241 {
 242         fprintf(stderr, "Usage: virtio_test [--help]"
 243                 " [--no-indirect]"
 244                 " [--no-event-idx]"
 245                 " [--delayed-interrupt]"
 246                 "\n");
 247 }
 248
 249 int main(int argc, char **argv)
 250 {
 251         struct vdev_info dev;
 252         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
 253                 (1ULL << VIRTIO_RING_F_EVENT_IDX);
 254         int o;
 255         bool delayed = false;
 256
 257         for (;;) {
 258                 o = getopt_long(argc, argv, optstring, longopts, NULL);
 259                 switch (o) {
 260                 case -1:
 261                         goto done;
 262                 case '?':
 263                         help();
 264                         exit(2);
 265                 case 'e':
 266                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
 267                         break;
 268                 case 'h':
 269                         help();
 270                         goto done;
 271                 case 'i':
 272                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
 273                         break;
 274                 case 'D':
 275                         delayed = true;
 276                         break;
 277                 default:
 278                         assert(0);
 279                         break;
 280                 }
 281         }
 282
 283 done:
 284         vdev_info_init(&dev, features);
 285         vq_info_add(&dev, 256);
 286         run_test(&dev, &dev.vqs[0], delayed, 0x100000);
 287         return 0;
 288 }