tools/virtio/virtio_test.c

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