linux/tools/virtio/virtio_test.c
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   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 */
  20void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
  21
  22struct 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
  33struct 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
  44void 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
  53void vq_callback(struct virtqueue *vq)
  54{
  55}
  56
  57
  58void 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
  88static 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
 111static 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. */
 141static 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
 152static 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
 206const char optstring[] = "h";
 207const 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
 240static 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
 249int 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
 283done:
 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}
 289
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