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 } 290