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 bool 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         return true;
  52 }
  53
  54 void vq_callback(struct virtqueue *vq)
  55 {
  56 }
  57
  58
  59 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
  60 {
  61         struct vhost_vring_state state = { .index = info->idx };
  62         struct vhost_vring_file file = { .index = info->idx };
  63         unsigned long long features = dev->vdev.features;
  64         struct vhost_vring_addr addr = {
  65                 .index = info->idx,
  66                 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
  67                 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
  68                 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
  69         };
  70         int r;
  71         r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
  72         assert(r >= 0);
  73         state.num = info->vring.num;
  74         r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
  75         assert(r >= 0);
  76         state.num = 0;
  77         r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
  78         assert(r >= 0);
  79         r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
  80         assert(r >= 0);
  81         file.fd = info->kick;
  82         r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
  83         assert(r >= 0);
  84         file.fd = info->call;
  85         r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
  86         assert(r >= 0);
  87 }
  88
  89 static void vq_info_add(struct vdev_info *dev, int num)
  90 {
  91         struct vq_info *info = &dev->vqs[dev->nvqs];
  92         int r;
  93         info->idx = dev->nvqs;
  94         info->kick = eventfd(0, EFD_NONBLOCK);
  95         info->call = eventfd(0, EFD_NONBLOCK);
  96         r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
  97         assert(r >= 0);
  98         memset(info->ring, 0, vring_size(num, 4096));
  99         vring_init(&info->vring, num, info->ring, 4096);
 100         info->vq = vring_new_virtqueue(info->idx,
 101                                        info->vring.num, 4096, &dev->vdev,
 102                                        true, info->ring,
 103                                        vq_notify, vq_callback, "test");
 104         assert(info->vq);
 105         info->vq->priv = info;
 106         vhost_vq_setup(dev, info);
 107         dev->fds[info->idx].fd = info->call;
 108         dev->fds[info->idx].events = POLLIN;
 109         dev->nvqs++;
 110 }
 111
 112 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
 113 {
 114         int r;
 115         memset(dev, 0, sizeof *dev);
 116         dev->vdev.features = features;
 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                                         if (unlikely(!virtqueue_kick(vq->vq)))
 175                                                 r = -1;
 176                                 }
 177                         } else
 178                                 r = -1;
 179
 180                         /* Flush out completed bufs if any */
 181                         if (virtqueue_get_buf(vq->vq, &len)) {
 182                                 ++completed;
 183                                 r = 0;
 184                         }
 185
 186                 } while (r == 0);
 187                 if (completed == completed_before)
 188                         ++spurious;
 189                 assert(completed <= bufs);
 190                 assert(started <= bufs);
 191                 if (completed == bufs)
 192                         break;
 193                 if (delayed) {
 194                         if (virtqueue_enable_cb_delayed(vq->vq))
 195                                 wait_for_interrupt(dev);
 196                 } else {
 197                         if (virtqueue_enable_cb(vq->vq))
 198                                 wait_for_interrupt(dev);
 199                 }
 200         }
 201         test = 0;
 202         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 203         assert(r >= 0);
 204         fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
 205 }
 206
 207 const char optstring[] = "h";
 208 const struct option longopts[] = {
 209         {
 210                 .name = "help",
 211                 .val = 'h',
 212         },
 213         {
 214                 .name = "event-idx",
 215                 .val = 'E',
 216         },
 217         {
 218                 .name = "no-event-idx",
 219                 .val = 'e',
 220         },
 221         {
 222                 .name = "indirect",
 223                 .val = 'I',
 224         },
 225         {
 226                 .name = "no-indirect",
 227                 .val = 'i',
 228         },
 229         {
 230                 .name = "delayed-interrupt",
 231                 .val = 'D',
 232         },
 233         {
 234                 .name = "no-delayed-interrupt",
 235                 .val = 'd',
 236         },
 237         {
 238         }
 239 };
 240
 241 static void help(void)
 242 {
 243         fprintf(stderr, "Usage: virtio_test [--help]"
 244                 " [--no-indirect]"
 245                 " [--no-event-idx]"
 246                 " [--delayed-interrupt]"
 247                 "\n");
 248 }
 249
 250 int main(int argc, char **argv)
 251 {
 252         struct vdev_info dev;
 253         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
 254                 (1ULL << VIRTIO_RING_F_EVENT_IDX);
 255         int o;
 256         bool delayed = false;
 257
 258         for (;;) {
 259                 o = getopt_long(argc, argv, optstring, longopts, NULL);
 260                 switch (o) {
 261                 case -1:
 262                         goto done;
 263                 case '?':
 264                         help();
 265                         exit(2);
 266                 case 'e':
 267                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
 268                         break;
 269                 case 'h':
 270                         help();
 271                         goto done;
 272                 case 'i':
 273                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
 274                         break;
 275                 case 'D':
 276                         delayed = true;
 277                         break;
 278                 default:
 279                         assert(0);
 280                         break;
 281                 }
 282         }
 283
 284 done:
 285         vdev_info_init(&dev, features);
 286         vq_info_add(&dev, 256);
 287         run_test(&dev, &dev.vqs[0], delayed, 0x100000);
 288         return 0;
 289 }