Revert "drm/i810: cleanup reclaim_buffers"
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / tools / virtio / virtio_test.c
blob6bf95f9953640c4671f94be6316383dabb9c5bc8
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"
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;
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;
40 void vq_notify(struct virtqueue *vq)
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);
49 void vq_callback(struct virtqueue *vq)
54 void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
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,
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);
84 static void vq_info_add(struct vdev_info *dev, int num)
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++;
106 static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
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);
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)
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);
147 static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
149 struct scatterlist sl;
150 long started = 0, completed = 0;
151 long completed_before;
152 int r, test = 1;
153 unsigned len;
154 long long spurious = 0;
155 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
156 assert(r >= 0);
157 for (;;) {
158 virtqueue_disable_cb(vq->vq);
159 completed_before = completed;
160 do {
161 if (started < bufs) {
162 sg_init_one(&sl, dev->buf, dev->buf_size);
163 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
164 dev->buf + started,
165 GFP_ATOMIC);
166 if (likely(r >= 0)) {
167 ++started;
168 virtqueue_kick(vq->vq);
170 } else
171 r = -1;
173 /* Flush out completed bufs if any */
174 if (virtqueue_get_buf(vq->vq, &len)) {
175 ++completed;
176 r = 0;
179 } while (r >= 0);
180 if (completed == completed_before)
181 ++spurious;
182 assert(completed <= bufs);
183 assert(started <= bufs);
184 if (completed == bufs)
185 break;
186 if (virtqueue_enable_cb(vq->vq)) {
187 wait_for_interrupt(dev);
190 test = 0;
191 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
192 assert(r >= 0);
193 fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
196 const char optstring[] = "h";
197 const struct option longopts[] = {
199 .name = "help",
200 .val = 'h',
203 .name = "event-idx",
204 .val = 'E',
207 .name = "no-event-idx",
208 .val = 'e',
211 .name = "indirect",
212 .val = 'I',
215 .name = "no-indirect",
216 .val = 'i',
222 static void help()
224 fprintf(stderr, "Usage: virtio_test [--help]"
225 " [--no-indirect]"
226 " [--no-event-idx]"
227 "\n");
230 int main(int argc, char **argv)
232 struct vdev_info dev;
233 unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
234 (1ULL << VIRTIO_RING_F_EVENT_IDX);
235 int o;
237 for (;;) {
238 o = getopt_long(argc, argv, optstring, longopts, NULL);
239 switch (o) {
240 case -1:
241 goto done;
242 case '?':
243 help();
244 exit(2);
245 case 'e':
246 features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
247 break;
248 case 'h':
249 help();
250 goto done;
251 case 'i':
252 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
253 break;
254 default:
255 assert(0);
256 break;
260 done:
261 vdev_info_init(&dev, features);
262 vq_info_add(&dev, 256);
263 run_test(&dev, &dev.vqs[0], 0x100000);
264 return 0;