~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/virtio/virtio_test.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 #define _GNU_SOURCE
  3 #include <getopt.h>
  4 #include <string.h>
  5 #include <poll.h>
  6 #include <sys/eventfd.h>
  7 #include <stdlib.h>
  8 #include <assert.h>
  9 #include <unistd.h>
 10 #include <sys/ioctl.h>
 11 #include <sys/stat.h>
 12 #include <sys/types.h>
 13 #include <fcntl.h>
 14 #include <stdbool.h>
 15 #include <linux/virtio_types.h>
 16 #include <linux/vhost.h>
 17 #include <linux/virtio.h>
 18 #include <linux/virtio_ring.h>
 19 #include "../../drivers/vhost/test.h"
 20 
 21 /* Unused */
 22 void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;
 23 
 24 struct vq_info {
 25         int kick;
 26         int call;
 27         int num;
 28         int idx;
 29         void *ring;
 30         /* copy used for control */
 31         struct vring vring;
 32         struct virtqueue *vq;
 33 };
 34 
 35 struct vdev_info {
 36         struct virtio_device vdev;
 37         int control;
 38         struct pollfd fds[1];
 39         struct vq_info vqs[1];
 40         int nvqs;
 41         void *buf;
 42         size_t buf_size;
 43         struct vhost_memory *mem;
 44 };
 45 
 46 bool vq_notify(struct virtqueue *vq)
 47 {
 48         struct vq_info *info = vq->priv;
 49         unsigned long long v = 1;
 50         int r;
 51         r = write(info->kick, &v, sizeof v);
 52         assert(r == sizeof v);
 53         return true;
 54 }
 55 
 56 void vq_callback(struct virtqueue *vq)
 57 {
 58 }
 59 
 60 
 61 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
 62 {
 63         struct vhost_vring_state state = { .index = info->idx };
 64         struct vhost_vring_file file = { .index = info->idx };
 65         unsigned long long features = dev->vdev.features;
 66         struct vhost_vring_addr addr = {
 67                 .index = info->idx,
 68                 .desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
 69                 .avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
 70                 .used_user_addr = (uint64_t)(unsigned long)info->vring.used,
 71         };
 72         int r;
 73         r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
 74         assert(r >= 0);
 75         state.num = info->vring.num;
 76         r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
 77         assert(r >= 0);
 78         state.num = 0;
 79         r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
 80         assert(r >= 0);
 81         r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
 82         assert(r >= 0);
 83         file.fd = info->kick;
 84         r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
 85         assert(r >= 0);
 86         file.fd = info->call;
 87         r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
 88         assert(r >= 0);
 89 }
 90 
 91 static void vq_info_add(struct vdev_info *dev, int num)
 92 {
 93         struct vq_info *info = &dev->vqs[dev->nvqs];
 94         int r;
 95         info->idx = dev->nvqs;
 96         info->kick = eventfd(0, EFD_NONBLOCK);
 97         info->call = eventfd(0, EFD_NONBLOCK);
 98         r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
 99         assert(r >= 0);
100         memset(info->ring, 0, vring_size(num, 4096));
101         vring_init(&info->vring, num, info->ring, 4096);
102         info->vq = vring_new_virtqueue(info->idx,
103                                        info->vring.num, 4096, &dev->vdev,
104                                        true, false, info->ring,
105                                        vq_notify, vq_callback, "test");
106         assert(info->vq);
107         info->vq->priv = info;
108         vhost_vq_setup(dev, info);
109         dev->fds[info->idx].fd = info->call;
110         dev->fds[info->idx].events = POLLIN;
111         dev->nvqs++;
112 }
113 
114 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
115 {
116         int r;
117         memset(dev, 0, sizeof *dev);
118         dev->vdev.features = features;
119         dev->buf_size = 1024;
120         dev->buf = malloc(dev->buf_size);
121         assert(dev->buf);
122         dev->control = open("/dev/vhost-test", O_RDWR);
123         assert(dev->control >= 0);
124         r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
125         assert(r >= 0);
126         dev->mem = malloc(offsetof(struct vhost_memory, regions) +
127                           sizeof dev->mem->regions[0]);
128         assert(dev->mem);
129         memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
130                           sizeof dev->mem->regions[0]);
131         dev->mem->nregions = 1;
132         dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
133         dev->mem->regions[0].userspace_addr = (long)dev->buf;
134         dev->mem->regions[0].memory_size = dev->buf_size;
135         r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
136         assert(r >= 0);
137 }
138 
139 /* TODO: this is pretty bad: we get a cache line bounce
140  * for the wait queue on poll and another one on read,
141  * plus the read which is there just to clear the
142  * current state. */
143 static void wait_for_interrupt(struct vdev_info *dev)
144 {
145         int i;
146         unsigned long long val;
147         poll(dev->fds, dev->nvqs, -1);
148         for (i = 0; i < dev->nvqs; ++i)
149                 if (dev->fds[i].revents & POLLIN) {
150                         read(dev->fds[i].fd, &val, sizeof val);
151                 }
152 }
153 
154 static void run_test(struct vdev_info *dev, struct vq_info *vq,
155                      bool delayed, int bufs)
156 {
157         struct scatterlist sl;
158         long started = 0, completed = 0;
159         long completed_before;
160         int r, test = 1;
161         unsigned len;
162         long long spurious = 0;
163         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
164         assert(r >= 0);
165         for (;;) {
166                 virtqueue_disable_cb(vq->vq);
167                 completed_before = completed;
168                 do {
169                         if (started < bufs) {
170                                 sg_init_one(&sl, dev->buf, dev->buf_size);
171                                 r = virtqueue_add_outbuf(vq->vq, &sl, 1,
172                                                          dev->buf + started,
173                                                          GFP_ATOMIC);
174                                 if (likely(r == 0)) {
175                                         ++started;
176                                         if (unlikely(!virtqueue_kick(vq->vq)))
177                                                 r = -1;
178                                 }
179                         } else
180                                 r = -1;
181 
182                         /* Flush out completed bufs if any */
183                         if (virtqueue_get_buf(vq->vq, &len)) {
184                                 ++completed;
185                                 r = 0;
186                         }
187 
188                 } while (r == 0);
189                 if (completed == completed_before)
190                         ++spurious;
191                 assert(completed <= bufs);
192                 assert(started <= bufs);
193                 if (completed == bufs)
194                         break;
195                 if (delayed) {
196                         if (virtqueue_enable_cb_delayed(vq->vq))
197                                 wait_for_interrupt(dev);
198                 } else {
199                         if (virtqueue_enable_cb(vq->vq))
200                                 wait_for_interrupt(dev);
201                 }
202         }
203         test = 0;
204         r = ioctl(dev->control, VHOST_TEST_RUN, &test);
205         assert(r >= 0);
206         fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious);
207 }
208 
209 const char optstring[] = "h";
210 const struct option longopts[] = {
211         {
212                 .name = "help",
213                 .val = 'h',
214         },
215         {
216                 .name = "event-idx",
217                 .val = 'E',
218         },
219         {
220                 .name = "no-event-idx",
221                 .val = 'e',
222         },
223         {
224                 .name = "indirect",
225                 .val = 'I',
226         },
227         {
228                 .name = "no-indirect",
229                 .val = 'i',
230         },
231         {
232                 .name = "virtio-1",
233                 .val = '1',
234         },
235         {
236                 .name = "no-virtio-1",
237                 .val = '',
238         },
239         {
240                 .name = "delayed-interrupt",
241                 .val = 'D',
242         },
243         {
244                 .name = "no-delayed-interrupt",
245                 .val = 'd',
246         },
247         {
248         }
249 };
250 
251 static void help(void)
252 {
253         fprintf(stderr, "Usage: virtio_test [--help]"
254                 " [--no-indirect]"
255                 " [--no-event-idx]"
256                 " [--no-virtio-1]"
257                 " [--delayed-interrupt]"
258                 "\n");
259 }
260 
261 int main(int argc, char **argv)
262 {
263         struct vdev_info dev;
264         unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
265                 (1ULL << VIRTIO_RING_F_EVENT_IDX) | (1ULL << VIRTIO_F_VERSION_1);
266         int o;
267         bool delayed = false;
268 
269         for (;;) {
270                 o = getopt_long(argc, argv, optstring, longopts, NULL);
271                 switch (o) {
272                 case -1:
273                         goto done;
274                 case '?':
275                         help();
276                         exit(2);
277                 case 'e':
278                         features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
279                         break;
280                 case 'h':
281                         help();
282                         goto done;
283                 case 'i':
284                         features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
285                         break;
286                 case '':
287                         features &= ~(1ULL << VIRTIO_F_VERSION_1);
288                         break;
289                 case 'D':
290                         delayed = true;
291                         break;
292                 default:
293                         assert(0);
294                         break;
295                 }
296         }
297 
298 done:
299         vdev_info_init(&dev, features);
300         vq_info_add(&dev, 256);
301         run_test(&dev, &dev.vqs[0], delayed, 0x100000);
302         return 0;
303 }
304 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp