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 } 303