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 <linux/vhost.h> 14 #include <linux/virtio.h> 15 #include <linux/virtio_ring.h> 16 #include "../../drivers/vhost/test.h" 17 18 struct vq_info { 19 int kick; 20 int call; 21 int num; 22 int idx; 23 void *ring; 24 /* copy used for control */ 25 struct vring vring; 26 struct virtqueue *vq; 27 }; 28 29 struct vdev_info { 30 struct virtio_device vdev; 31 int control; 32 struct pollfd fds[1]; 33 struct vq_info vqs[1]; 34 int nvqs; 35 void *buf; 36 size_t buf_size; 37 struct vhost_memory *mem; 38 }; 39 40 void vq_notify(struct virtqueue *vq) 41 { 42 struct vq_info *info = vq->priv; 43 unsigned long long v = 1; 44 int r; 45 r = write(info->kick, &v, sizeof v); 46 assert(r == sizeof v); 47 } 48 49 void vq_callback(struct virtqueue *vq) 50 { 51 } 52 53 54 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info) 55 { 56 struct vhost_vring_state state = { .index = info->idx }; 57 struct vhost_vring_file file = { .index = info->idx }; 58 unsigned long long features = dev->vdev.features[0]; 59 struct vhost_vring_addr addr = { 60 .index = info->idx, 61 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc, 62 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail, 63 .used_user_addr = (uint64_t)(unsigned long)info->vring.used, 64 }; 65 int r; 66 r = ioctl(dev->control, VHOST_SET_FEATURES, &features); 67 assert(r >= 0); 68 state.num = info->vring.num; 69 r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state); 70 assert(r >= 0); 71 state.num = 0; 72 r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state); 73 assert(r >= 0); 74 r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr); 75 assert(r >= 0); 76 file.fd = info->kick; 77 r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file); 78 assert(r >= 0); 79 file.fd = info->call; 80 r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file); 81 assert(r >= 0); 82 } 83 84 static void vq_info_add(struct vdev_info *dev, int num) 85 { 86 struct vq_info *info = &dev->vqs[dev->nvqs]; 87 int r; 88 info->idx = dev->nvqs; 89 info->kick = eventfd(0, EFD_NONBLOCK); 90 info->call = eventfd(0, EFD_NONBLOCK); 91 r = posix_memalign(&info->ring, 4096, vring_size(num, 4096)); 92 assert(r >= 0); 93 memset(info->ring, 0, vring_size(num, 4096)); 94 vring_init(&info->vring, num, info->ring, 4096); 95 info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev, 96 true, info->ring, 97 vq_notify, vq_callback, "test"); 98 assert(info->vq); 99 info->vq->priv = info; 100 vhost_vq_setup(dev, info); 101 dev->fds[info->idx].fd = info->call; 102 dev->fds[info->idx].events = POLLIN; 103 dev->nvqs++; 104 } 105 106 static void vdev_info_init(struct vdev_info* dev, unsigned long long features) 107 { 108 int r; 109 memset(dev, 0, sizeof *dev); 110 dev->vdev.features[0] = features; 111 dev->vdev.features[1] = features >> 32; 112 dev->buf_size = 1024; 113 dev->buf = malloc(dev->buf_size); 114 assert(dev->buf); 115 dev->control = open("/dev/vhost-test", O_RDWR); 116 assert(dev->control >= 0); 117 r = ioctl(dev->control, VHOST_SET_OWNER, NULL); 118 assert(r >= 0); 119 dev->mem = malloc(offsetof(struct vhost_memory, regions) + 120 sizeof dev->mem->regions[0]); 121 assert(dev->mem); 122 memset(dev->mem, 0, offsetof(struct vhost_memory, regions) + 123 sizeof dev->mem->regions[0]); 124 dev->mem->nregions = 1; 125 dev->mem->regions[0].guest_phys_addr = (long)dev->buf; 126 dev->mem->regions[0].userspace_addr = (long)dev->buf; 127 dev->mem->regions[0].memory_size = dev->buf_size; 128 r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem); 129 assert(r >= 0); 130 } 131 132 /* TODO: this is pretty bad: we get a cache line bounce 133 * for the wait queue on poll and another one on read, 134 * plus the read which is there just to clear the 135 * current state. */ 136 static void wait_for_interrupt(struct vdev_info *dev) 137 { 138 int i; 139 unsigned long long val; 140 poll(dev->fds, dev->nvqs, -1); 141 for (i = 0; i < dev->nvqs; ++i) 142 if (dev->fds[i].revents & POLLIN) { 143 read(dev->fds[i].fd, &val, sizeof val); 144 } 145 } 146 147 static void run_test(struct vdev_info *dev, struct vq_info *vq, 148 bool delayed, int bufs) 149 { 150 struct scatterlist sl; 151 long started = 0, completed = 0; 152 long completed_before; 153 int r, test = 1; 154 unsigned len; 155 long long spurious = 0; 156 r = ioctl(dev->control, VHOST_TEST_RUN, &test); 157 assert(r >= 0); 158 for (;;) { 159 virtqueue_disable_cb(vq->vq); 160 completed_before = completed; 161 do { 162 if (started < bufs) { 163 sg_init_one(&sl, dev->buf, dev->buf_size); 164 r = virtqueue_add_buf(vq->vq, &sl, 1, 0, 165 dev->buf + started, 166 GFP_ATOMIC); 167 if (likely(r == 0)) { 168 ++started; 169 virtqueue_kick(vq->vq); 170 } 171 } else 172 r = -1; 173 174 /* Flush out completed bufs if any */ 175 if (virtqueue_get_buf(vq->vq, &len)) { 176 ++completed; 177 r = 0; 178 } 179 180 } while (r == 0); 181 if (completed == completed_before) 182 ++spurious; 183 assert(completed <= bufs); 184 assert(started <= bufs); 185 if (completed == bufs) 186 break; 187 if (delayed) { 188 if (virtqueue_enable_cb_delayed(vq->vq)) 189 wait_for_interrupt(dev); 190 } else { 191 if (virtqueue_enable_cb(vq->vq)) 192 wait_for_interrupt(dev); 193 } 194 } 195 test = 0; 196 r = ioctl(dev->control, VHOST_TEST_RUN, &test); 197 assert(r >= 0); 198 fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious); 199 } 200 201 const char optstring[] = "h"; 202 const struct option longopts[] = { 203 { 204 .name = "help", 205 .val = 'h', 206 }, 207 { 208 .name = "event-idx", 209 .val = 'E', 210 }, 211 { 212 .name = "no-event-idx", 213 .val = 'e', 214 }, 215 { 216 .name = "indirect", 217 .val = 'I', 218 }, 219 { 220 .name = "no-indirect", 221 .val = 'i', 222 }, 223 { 224 .name = "delayed-interrupt", 225 .val = 'D', 226 }, 227 { 228 .name = "no-delayed-interrupt", 229 .val = 'd', 230 }, 231 { 232 } 233 }; 234 235 static void help(void) 236 { 237 fprintf(stderr, "Usage: virtio_test [--help]" 238 " [--no-indirect]" 239 " [--no-event-idx]" 240 " [--delayed-interrupt]" 241 "\n"); 242 } 243 244 int main(int argc, char **argv) 245 { 246 struct vdev_info dev; 247 unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | 248 (1ULL << VIRTIO_RING_F_EVENT_IDX); 249 int o; 250 bool delayed = false; 251 252 for (;;) { 253 o = getopt_long(argc, argv, optstring, longopts, NULL); 254 switch (o) { 255 case -1: 256 goto done; 257 case '?': 258 help(); 259 exit(2); 260 case 'e': 261 features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX); 262 break; 263 case 'h': 264 help(); 265 goto done; 266 case 'i': 267 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC); 268 break; 269 case 'D': 270 delayed = true; 271 break; 272 default: 273 assert(0); 274 break; 275 } 276 } 277 278 done: 279 vdev_info_init(&dev, features); 280 vq_info_add(&dev, 256); 281 run_test(&dev, &dev.vqs[0], delayed, 0x100000); 282 return 0; 283 } 284