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 void 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 53 void vq_callback(struct virtqueue *vq) 54 { 55 } 56 57 58 void 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 88 static 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 } 110 111 static 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. */ 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 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 } 205 206 const char optstring[] = "h"; 207 const 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 }; 239 240 static void help(void) 241 { 242 fprintf(stderr, "Usage: virtio_test [--help]" 243 " [--no-indirect]" 244 " [--no-event-idx]" 245 " [--delayed-interrupt]" 246 "\n"); 247 } 248 249 int 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 } 282 283 done: 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