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[0]; 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[0] = features; 117 dev->vdev.features[1] = features >> 32; 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 = "delayed-interrupt", 232 .val = 'D', 233 }, 234 { 235 .name = "no-delayed-interrupt", 236 .val = 'd', 237 }, 238 { 239 } 240 }; 241 242 static void help(void) 243 { 244 fprintf(stderr, "Usage: virtio_test [--help]" 245 " [--no-indirect]" 246 " [--no-event-idx]" 247 " [--delayed-interrupt]" 248 "\n"); 249 } 250 251 int main(int argc, char **argv) 252 { 253 struct vdev_info dev; 254 unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | 255 (1ULL << VIRTIO_RING_F_EVENT_IDX); 256 int o; 257 bool delayed = false; 258 259 for (;;) { 260 o = getopt_long(argc, argv, optstring, longopts, NULL); 261 switch (o) { 262 case -1: 263 goto done; 264 case '?': 265 help(); 266 exit(2); 267 case 'e': 268 features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX); 269 break; 270 case 'h': 271 help(); 272 goto done; 273 case 'i': 274 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC); 275 break; 276 case 'D': 277 delayed = true; 278 break; 279 default: 280 assert(0); 281 break; 282 } 283 } 284 285 done: 286 vdev_info_init(&dev, features); 287 vq_info_add(&dev, 256); 288 run_test(&dev, &dev.vqs[0], delayed, 0x100000); 289 return 0; 290 } 291