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71ccc212 MT |
1 | /* Copyright (C) 2009 Red Hat, Inc. |
2 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. | |
5 | * | |
6 | * test virtio server in host kernel. | |
7 | */ | |
8 | ||
9 | #include <linux/compat.h> | |
10 | #include <linux/eventfd.h> | |
11 | #include <linux/vhost.h> | |
12 | #include <linux/miscdevice.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/mutex.h> | |
15 | #include <linux/workqueue.h> | |
71ccc212 MT |
16 | #include <linux/file.h> |
17 | #include <linux/slab.h> | |
18 | ||
19 | #include "test.h" | |
6ac1afbf | 20 | #include "vhost.h" |
71ccc212 MT |
21 | |
22 | /* Max number of bytes transferred before requeueing the job. | |
23 | * Using this limit prevents one virtqueue from starving others. */ | |
24 | #define VHOST_TEST_WEIGHT 0x80000 | |
25 | ||
26 | enum { | |
27 | VHOST_TEST_VQ = 0, | |
28 | VHOST_TEST_VQ_MAX = 1, | |
29 | }; | |
30 | ||
31 | struct vhost_test { | |
32 | struct vhost_dev dev; | |
33 | struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX]; | |
34 | }; | |
35 | ||
36 | /* Expects to be always run from workqueue - which acts as | |
37 | * read-size critical section for our kind of RCU. */ | |
38 | static void handle_vq(struct vhost_test *n) | |
39 | { | |
09a34c84 | 40 | struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ]; |
71ccc212 MT |
41 | unsigned out, in; |
42 | int head; | |
43 | size_t len, total_len = 0; | |
44 | void *private; | |
45 | ||
09a34c84 MT |
46 | mutex_lock(&vq->mutex); |
47 | private = vq->private_data; | |
48 | if (!private) { | |
49 | mutex_unlock(&vq->mutex); | |
71ccc212 | 50 | return; |
09a34c84 | 51 | } |
71ccc212 | 52 | |
8ea8cf89 | 53 | vhost_disable_notify(&n->dev, vq); |
71ccc212 MT |
54 | |
55 | for (;;) { | |
56 | head = vhost_get_vq_desc(&n->dev, vq, vq->iov, | |
57 | ARRAY_SIZE(vq->iov), | |
58 | &out, &in, | |
59 | NULL, NULL); | |
60 | /* On error, stop handling until the next kick. */ | |
61 | if (unlikely(head < 0)) | |
62 | break; | |
63 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
64 | if (head == vq->num) { | |
8ea8cf89 MT |
65 | if (unlikely(vhost_enable_notify(&n->dev, vq))) { |
66 | vhost_disable_notify(&n->dev, vq); | |
71ccc212 MT |
67 | continue; |
68 | } | |
69 | break; | |
70 | } | |
71 | if (in) { | |
72 | vq_err(vq, "Unexpected descriptor format for TX: " | |
73 | "out %d, int %d\n", out, in); | |
74 | break; | |
75 | } | |
76 | len = iov_length(vq->iov, out); | |
77 | /* Sanity check */ | |
78 | if (!len) { | |
79 | vq_err(vq, "Unexpected 0 len for TX\n"); | |
80 | break; | |
81 | } | |
82 | vhost_add_used_and_signal(&n->dev, vq, head, 0); | |
83 | total_len += len; | |
84 | if (unlikely(total_len >= VHOST_TEST_WEIGHT)) { | |
85 | vhost_poll_queue(&vq->poll); | |
86 | break; | |
87 | } | |
88 | } | |
89 | ||
90 | mutex_unlock(&vq->mutex); | |
91 | } | |
92 | ||
93 | static void handle_vq_kick(struct vhost_work *work) | |
94 | { | |
95 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, | |
96 | poll.work); | |
97 | struct vhost_test *n = container_of(vq->dev, struct vhost_test, dev); | |
98 | ||
99 | handle_vq(n); | |
100 | } | |
101 | ||
102 | static int vhost_test_open(struct inode *inode, struct file *f) | |
103 | { | |
104 | struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL); | |
105 | struct vhost_dev *dev; | |
09a34c84 | 106 | struct vhost_virtqueue **vqs; |
71ccc212 MT |
107 | int r; |
108 | ||
109 | if (!n) | |
110 | return -ENOMEM; | |
09a34c84 MT |
111 | vqs = kmalloc(VHOST_TEST_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
112 | if (!vqs) { | |
113 | kfree(n); | |
114 | return -ENOMEM; | |
115 | } | |
71ccc212 MT |
116 | |
117 | dev = &n->dev; | |
09a34c84 | 118 | vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ]; |
71ccc212 | 119 | n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick; |
09a34c84 | 120 | r = vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX); |
71ccc212 | 121 | if (r < 0) { |
09a34c84 | 122 | kfree(vqs); |
71ccc212 MT |
123 | kfree(n); |
124 | return r; | |
125 | } | |
126 | ||
127 | f->private_data = n; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static void *vhost_test_stop_vq(struct vhost_test *n, | |
133 | struct vhost_virtqueue *vq) | |
134 | { | |
135 | void *private; | |
136 | ||
137 | mutex_lock(&vq->mutex); | |
09a34c84 MT |
138 | private = vq->private_data; |
139 | vq->private_data = NULL; | |
71ccc212 MT |
140 | mutex_unlock(&vq->mutex); |
141 | return private; | |
142 | } | |
143 | ||
144 | static void vhost_test_stop(struct vhost_test *n, void **privatep) | |
145 | { | |
146 | *privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ); | |
147 | } | |
148 | ||
149 | static void vhost_test_flush_vq(struct vhost_test *n, int index) | |
150 | { | |
09a34c84 | 151 | vhost_poll_flush(&n->vqs[index].poll); |
71ccc212 MT |
152 | } |
153 | ||
154 | static void vhost_test_flush(struct vhost_test *n) | |
155 | { | |
156 | vhost_test_flush_vq(n, VHOST_TEST_VQ); | |
157 | } | |
158 | ||
159 | static int vhost_test_release(struct inode *inode, struct file *f) | |
160 | { | |
161 | struct vhost_test *n = f->private_data; | |
162 | void *private; | |
163 | ||
164 | vhost_test_stop(n, &private); | |
165 | vhost_test_flush(n); | |
5e7045b0 | 166 | vhost_dev_cleanup(&n->dev, false); |
71ccc212 MT |
167 | /* We do an extra flush before freeing memory, |
168 | * since jobs can re-queue themselves. */ | |
169 | vhost_test_flush(n); | |
170 | kfree(n); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | static long vhost_test_run(struct vhost_test *n, int test) | |
175 | { | |
176 | void *priv, *oldpriv; | |
177 | struct vhost_virtqueue *vq; | |
178 | int r, index; | |
179 | ||
180 | if (test < 0 || test > 1) | |
181 | return -EINVAL; | |
182 | ||
183 | mutex_lock(&n->dev.mutex); | |
184 | r = vhost_dev_check_owner(&n->dev); | |
185 | if (r) | |
186 | goto err; | |
187 | ||
188 | for (index = 0; index < n->dev.nvqs; ++index) { | |
189 | /* Verify that ring has been setup correctly. */ | |
190 | if (!vhost_vq_access_ok(&n->vqs[index])) { | |
191 | r = -EFAULT; | |
192 | goto err; | |
193 | } | |
194 | } | |
195 | ||
196 | for (index = 0; index < n->dev.nvqs; ++index) { | |
197 | vq = n->vqs + index; | |
198 | mutex_lock(&vq->mutex); | |
199 | priv = test ? n : NULL; | |
200 | ||
201 | /* start polling new socket */ | |
22fa90c7 AH |
202 | oldpriv = vq->private_data; |
203 | vq->private_data = priv; | |
71ccc212 | 204 | |
f59281da JW |
205 | r = vhost_init_used(&n->vqs[index]); |
206 | ||
71ccc212 MT |
207 | mutex_unlock(&vq->mutex); |
208 | ||
f59281da JW |
209 | if (r) |
210 | goto err; | |
211 | ||
71ccc212 MT |
212 | if (oldpriv) { |
213 | vhost_test_flush_vq(n, index); | |
214 | } | |
215 | } | |
216 | ||
217 | mutex_unlock(&n->dev.mutex); | |
218 | return 0; | |
219 | ||
220 | err: | |
221 | mutex_unlock(&n->dev.mutex); | |
222 | return r; | |
223 | } | |
224 | ||
225 | static long vhost_test_reset_owner(struct vhost_test *n) | |
226 | { | |
227 | void *priv = NULL; | |
228 | long err; | |
150b9e51 MT |
229 | struct vhost_memory *memory; |
230 | ||
71ccc212 MT |
231 | mutex_lock(&n->dev.mutex); |
232 | err = vhost_dev_check_owner(&n->dev); | |
233 | if (err) | |
234 | goto done; | |
150b9e51 MT |
235 | memory = vhost_dev_reset_owner_prepare(); |
236 | if (!memory) { | |
237 | err = -ENOMEM; | |
238 | goto done; | |
239 | } | |
71ccc212 MT |
240 | vhost_test_stop(n, &priv); |
241 | vhost_test_flush(n); | |
150b9e51 | 242 | vhost_dev_reset_owner(&n->dev, memory); |
71ccc212 MT |
243 | done: |
244 | mutex_unlock(&n->dev.mutex); | |
245 | return err; | |
246 | } | |
247 | ||
248 | static int vhost_test_set_features(struct vhost_test *n, u64 features) | |
249 | { | |
250 | mutex_lock(&n->dev.mutex); | |
251 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
252 | !vhost_log_access_ok(&n->dev)) { | |
253 | mutex_unlock(&n->dev.mutex); | |
254 | return -EFAULT; | |
255 | } | |
256 | n->dev.acked_features = features; | |
257 | smp_wmb(); | |
258 | vhost_test_flush(n); | |
259 | mutex_unlock(&n->dev.mutex); | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static long vhost_test_ioctl(struct file *f, unsigned int ioctl, | |
264 | unsigned long arg) | |
265 | { | |
266 | struct vhost_test *n = f->private_data; | |
267 | void __user *argp = (void __user *)arg; | |
268 | u64 __user *featurep = argp; | |
269 | int test; | |
270 | u64 features; | |
271 | int r; | |
272 | switch (ioctl) { | |
273 | case VHOST_TEST_RUN: | |
274 | if (copy_from_user(&test, argp, sizeof test)) | |
275 | return -EFAULT; | |
276 | return vhost_test_run(n, test); | |
277 | case VHOST_GET_FEATURES: | |
09a34c84 | 278 | features = VHOST_FEATURES; |
71ccc212 MT |
279 | if (copy_to_user(featurep, &features, sizeof features)) |
280 | return -EFAULT; | |
281 | return 0; | |
282 | case VHOST_SET_FEATURES: | |
283 | if (copy_from_user(&features, featurep, sizeof features)) | |
284 | return -EFAULT; | |
09a34c84 | 285 | if (features & ~VHOST_FEATURES) |
71ccc212 MT |
286 | return -EOPNOTSUPP; |
287 | return vhost_test_set_features(n, features); | |
288 | case VHOST_RESET_OWNER: | |
289 | return vhost_test_reset_owner(n); | |
290 | default: | |
291 | mutex_lock(&n->dev.mutex); | |
73640c99 MT |
292 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
293 | if (r == -ENOIOCTLCMD) | |
294 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
71ccc212 MT |
295 | vhost_test_flush(n); |
296 | mutex_unlock(&n->dev.mutex); | |
297 | return r; | |
298 | } | |
299 | } | |
300 | ||
301 | #ifdef CONFIG_COMPAT | |
302 | static long vhost_test_compat_ioctl(struct file *f, unsigned int ioctl, | |
303 | unsigned long arg) | |
304 | { | |
305 | return vhost_test_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
306 | } | |
307 | #endif | |
308 | ||
309 | static const struct file_operations vhost_test_fops = { | |
310 | .owner = THIS_MODULE, | |
311 | .release = vhost_test_release, | |
312 | .unlocked_ioctl = vhost_test_ioctl, | |
313 | #ifdef CONFIG_COMPAT | |
314 | .compat_ioctl = vhost_test_compat_ioctl, | |
315 | #endif | |
316 | .open = vhost_test_open, | |
317 | .llseek = noop_llseek, | |
318 | }; | |
319 | ||
320 | static struct miscdevice vhost_test_misc = { | |
321 | MISC_DYNAMIC_MINOR, | |
322 | "vhost-test", | |
323 | &vhost_test_fops, | |
324 | }; | |
325 | ||
326 | static int vhost_test_init(void) | |
327 | { | |
328 | return misc_register(&vhost_test_misc); | |
329 | } | |
330 | module_init(vhost_test_init); | |
331 | ||
332 | static void vhost_test_exit(void) | |
333 | { | |
334 | misc_deregister(&vhost_test_misc); | |
335 | } | |
336 | module_exit(vhost_test_exit); | |
337 | ||
338 | MODULE_VERSION("0.0.1"); | |
339 | MODULE_LICENSE("GPL v2"); | |
340 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
341 | MODULE_DESCRIPTION("Host kernel side for virtio simulator"); |