kernel/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/virtio_types.h>
  15 #include <linux/vhost.h>
  16 #include <linux/virtio.h>
  17 #include <linux/virtio_ring.h>
  18 #include "../../drivers/vhost/test.h"
  19
  20 /* Unused */
  21 void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
  22
  23 struct vq_info {
  24         int kick;
  25         int call;
  26         int num;
  27         int idx;
  28         void *ring;
  29         /* copy used for control */
  30         struct vring vring;
  31         struct virtqueue *vq;
  32 };
  33
  34 struct vdev_info {
  35         struct virtio_device vdev;
  36         int control;
  37         struct pollfd fds[1];
  38         struct vq_info vqs[1];
  39         int nvqs;
  40         void *buf;
  41         size_t buf_size;
  42         struct vhost_memory *mem;
  43 };
  44
  45 bool vq_notify(struct virtqueue *vq)
  46 {
  47         struct vq_info *info = vq->priv;
  48         unsigned long long v = 1;
  49         int r;
  50         r = write(info->kick, &v, sizeof v);
  51         assert(r == sizeof v);
  52         return true;
  53 }
  54
  55 void vq_callback(struct virtqueue *vq)
  56 {
  57 }
  58
  59
  60 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
  61 {
  62         struct vhost_vring_state state = { .index = info->idx };
  63         struct vhost_vring_file file = { .index = info->idx };
  64         unsigned long long features = dev->vdev.features;
  65         struct vhost_vring_addr addr = {
  66                 .index = info->idx,
  67                 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
  68                 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
  69                 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
  70         };
  71         int r;
  72         r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
  73         assert(r >= 0);
  74         state.num = info->vring.num;
  75         r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
  76         assert(r >= 0);
  77         state.num = 0;
  78         r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
  79         assert(r >= 0);
  80         r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
  81         assert(r >= 0);
  82         file.fd = info->kick;
  83         r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
  84         assert(r >= 0);
  85         file.fd = info->call;
  86         r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
  87         assert(r >= 0);
  88 }
  89
  90 static void vq_info_add(struct vdev_info *dev, int num)
  91 {
  92         struct vq_info *info = &dev->vqs[dev->nvqs];
  93         int r;
  94         info->idx = dev->nvqs;
  95         info->kick = eventfd(0, EFD_NONBLOCK);
  96         info->call = eventfd(0, EFD_NONBLOCK);
  97         r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
  98         assert(r >= 0);
  99         memset(info->ring, 0, vring_size(num, 4096));
 100         vring_init(&info->vring, num, info->ring, 4096);
 101         info->vq = vring_new_virtqueue(info->idx,
 102                                        info->vring.num, 4096, &dev->vdev,
 103                                        true, info->ring,
 104                                        vq_notify, vq_callback, "test");
 105         assert(info->vq);
 106         info->vq->priv = info;
 107         vhost_vq_setup(dev, info);
 108         dev->fds[info->idx].fd = info->call;
 109         dev->fds[info->idx].events = POLLIN;
 110         dev->nvqs++;
 111 }
 112
 113 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
 114 {
 115         int r;
 116         memset(dev, 0, sizeof *dev);
 117         dev->vdev.features = features;
 118         dev->buf_size = 1024;
 119         dev->buf = malloc(dev->buf_size);
 120         assert(dev->buf);
 121         dev->control = open("/dev/vhost-test", O_RDWR);
 122         assert(dev->control >= 0);
 123         r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
 124         assert(r >= 0);
 125         dev->mem = malloc(offsetof(struct vhost_memory, regions) +
 126                           sizeof dev->mem->regions[0]);
 127         assert(dev->mem);
 128         memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
 129                           sizeof dev->mem->regions[0]);
 130         dev->mem->nregions = 1;
 131         dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
 132         dev->mem->regions[0].userspace_addr = (long)dev->buf;
 133         dev->mem->regions[0].memory_size = dev->buf_size;
 134         r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
 135         assert(r >= 0);
 136 }
 137
 138 /* TODO: this is pretty bad: we get a cache line bounce
 139  * for the wait queue on poll and another one on read,
 140  * plus the read which is there just to clear the
 141  * current state. */
 142 static void wait_for_interrupt(struct vdev_info *dev)
 143 {
 144         int i;
 145         unsigned long long val;
 146         poll(dev->fds, dev->nvqs, -1);
 147         for (i = 0; i < dev->nvqs; ++i)
 148                 if (dev->fds[i].revents & POLLIN) {
 149                         read(dev->fds[i].fd, &val, sizeof val);
 150                 }
 151 }
 152
 153 static void run_test(struct vdev_info *dev, struct vq_info *vq,
 154                      bool delayed, int bufs)
 155 {
 156         struct scatterlist sl;
 157         long started = 0, completed = 0;
 158         long completed_before;
 159         int r, test = 1;
 160         unsigned len;
 161         long long spurious = 0;
 162         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 163         assert(r >= 0);
 164         for (;;) {
 165                 virtqueue_disable_cb(vq->vq);
 166                 completed_before = completed;
 167                 do {
 168                         if (started < bufs) {
 169                                 sg_init_one(&sl, dev->buf, dev->buf_size);
 170                                 r = virtqueue_add_outbuf(vq->vq, &sl, 1,
 171                                                          dev->buf + started,
 172                                                          GFP_ATOMIC);
 173                                 if (likely(r == 0)) {
 174                                         ++started;
 175                                         if (unlikely(!virtqueue_kick(vq->vq)))
 176                                                 r = -1;
 177                                 }
 178                         } else
 179                                 r = -1;
 180
 181                         /* Flush out completed bufs if any */
 182                         if (virtqueue_get_buf(vq->vq, &len)) {
 183                                 ++completed;
 184                                 r = 0;
 185                         }
 186
 187                 } while (r == 0);
 188                 if (completed == completed_before)
 189                         ++spurious;
 190                 assert(completed <= bufs);
 191                 assert(started <= bufs);
 192                 if (completed == bufs)
 193                         break;
 194                 if (delayed) {
 195                         if (virtqueue_enable_cb_delayed(vq->vq))
 196                                 wait_for_interrupt(dev);
 197                 } else {
 198                         if (virtqueue_enable_cb(vq->vq))
 199                                 wait_for_interrupt(dev);
 200                 }
 201         }
 202         test = 0;
 203         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
 204         assert(r >= 0);
 205         fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
 206 }
 207
 208 const char optstring[] = "h";
 209 const struct option longopts[] = {
 210         {
 211                 .name = "help",
 212                 .val = 'h',
 213         },
 214         {
 215                 .name = "event-idx",
 216                 .val = 'E',
 217         },
 218         {
 219                 .name = "no-event-idx",
 220                 .val = 'e',
 221         },
 222         {
 223                 .name = "indirect",
 224                 .val = 'I',
 225         },
 226         {
 227                 .name = "no-indirect",
 228                 .val = 'i',
 229         },
 230         {
 231                 .name = "virtio-1",
 232                 .val = '1',
 233         },
 234         {
 235                 .name = "no-virtio-1",
 236                 .val = '0',
 237         },
 238         {
 239                 .name = "delayed-interrupt",
 240                 .val = 'D',
 241         },
 242         {
 243                 .name = "no-delayed-interrupt",
 244                 .val = 'd',
 245         },
 246         {
 247         }
 248 };
 249
 250 static void help(void)
 251 {
 252         fprintf(stderr, "Usage: virtio_test [--help]"
 253                 " [--no-indirect]"
 254                 " [--no-event-idx]"
 255                 " [--no-virtio-1]"
 256                 " [--delayed-interrupt]"
 257                 "\n");
 258 }
 259
 260 int main(int argc, char **argv)
 261 {
 262         struct vdev_info dev;
 263         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
 264                 (1ULL << VIRTIO_RING_F_EVENT_IDX) | (1ULL << VIRTIO_F_VERSION_1);
 265         int o;
 266         bool delayed = false;
 267
 268         for (;;) {
 269                 o = getopt_long(argc, argv, optstring, longopts, NULL);
 270                 switch (o) {
 271                 case -1:
 272                         goto done;
 273                 case '?':
 274                         help();
 275                         exit(2);
 276                 case 'e':
 277                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
 278                         break;
 279                 case 'h':
 280                         help();
 281                         goto done;
 282                 case 'i':
 283                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
 284                         break;
 285                 case '0':
 286                         features &= ~(1ULL << VIRTIO_F_VERSION_1);
 287                         break;
 288                 case 'D':
 289                         delayed = true;
 290                         break;
 291                 default:
 292                         assert(0);
 293                         break;
 294                 }
 295         }
 296
 297 done:
 298         vdev_info_init(&dev, features);
 299         vq_info_add(&dev, 256);
 300         run_test(&dev, &dev.vqs[0], delayed, 0x100000);
 301         return 0;
 302 }