blob: d9c501eaa6c3362b7ea89cdb39d33334f435af47 [file] [log] [blame]
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +02001/* 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>
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020016#include <linux/file.h>
17#include <linux/slab.h>
18
19#include "test.h"
Asias He6ac1afb2013-05-06 16:38:21 +080020#include "vhost.h"
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020021
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
26enum {
27 VHOST_TEST_VQ = 0,
28 VHOST_TEST_VQ_MAX = 1,
29};
30
31struct 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. */
38static void handle_vq(struct vhost_test *n)
39{
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +030040 struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ];
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020041 unsigned out, in;
42 int head;
43 size_t len, total_len = 0;
44 void *private;
45
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020046 mutex_lock(&vq->mutex);
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +030047 private = vq->private_data;
48 if (!private) {
49 mutex_unlock(&vq->mutex);
50 return;
51 }
52
Michael S. Tsirkin8ea8cf82011-05-20 02:10:54 +030053 vhost_disable_notify(&n->dev, vq);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020054
55 for (;;) {
Michael S. Tsirkin47283be2014-06-05 15:20:27 +030056 head = vhost_get_vq_desc(vq, vq->iov,
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020057 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) {
Michael S. Tsirkin8ea8cf82011-05-20 02:10:54 +030065 if (unlikely(vhost_enable_notify(&n->dev, vq))) {
66 vhost_disable_notify(&n->dev, vq);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +020067 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
93static 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
102static 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;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300106 struct vhost_virtqueue **vqs;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200107
108 if (!n)
109 return -ENOMEM;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300110 vqs = kmalloc(VHOST_TEST_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
111 if (!vqs) {
112 kfree(n);
113 return -ENOMEM;
114 }
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200115
116 dev = &n->dev;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300117 vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200118 n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
Zhi Yong Wu59566b6e2013-12-07 04:13:03 +0800119 vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200120
121 f->private_data = n;
122
123 return 0;
124}
125
126static void *vhost_test_stop_vq(struct vhost_test *n,
127 struct vhost_virtqueue *vq)
128{
129 void *private;
130
131 mutex_lock(&vq->mutex);
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300132 private = vq->private_data;
133 vq->private_data = NULL;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200134 mutex_unlock(&vq->mutex);
135 return private;
136}
137
138static void vhost_test_stop(struct vhost_test *n, void **privatep)
139{
140 *privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
141}
142
143static void vhost_test_flush_vq(struct vhost_test *n, int index)
144{
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300145 vhost_poll_flush(&n->vqs[index].poll);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200146}
147
148static void vhost_test_flush(struct vhost_test *n)
149{
150 vhost_test_flush_vq(n, VHOST_TEST_VQ);
151}
152
153static int vhost_test_release(struct inode *inode, struct file *f)
154{
155 struct vhost_test *n = f->private_data;
156 void *private;
157
158 vhost_test_stop(n, &private);
159 vhost_test_flush(n);
Zhi Yong Wu5e7045b02012-04-09 10:42:13 +0300160 vhost_dev_cleanup(&n->dev, false);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200161 /* We do an extra flush before freeing memory,
162 * since jobs can re-queue themselves. */
163 vhost_test_flush(n);
164 kfree(n);
165 return 0;
166}
167
168static long vhost_test_run(struct vhost_test *n, int test)
169{
170 void *priv, *oldpriv;
171 struct vhost_virtqueue *vq;
172 int r, index;
173
174 if (test < 0 || test > 1)
175 return -EINVAL;
176
177 mutex_lock(&n->dev.mutex);
178 r = vhost_dev_check_owner(&n->dev);
179 if (r)
180 goto err;
181
182 for (index = 0; index < n->dev.nvqs; ++index) {
183 /* Verify that ring has been setup correctly. */
184 if (!vhost_vq_access_ok(&n->vqs[index])) {
185 r = -EFAULT;
186 goto err;
187 }
188 }
189
190 for (index = 0; index < n->dev.nvqs; ++index) {
191 vq = n->vqs + index;
192 mutex_lock(&vq->mutex);
193 priv = test ? n : NULL;
194
195 /* start polling new socket */
Asias He22fa90c2013-05-07 14:54:36 +0800196 oldpriv = vq->private_data;
197 vq->private_data = priv;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200198
Jason Wangf59281d2011-06-21 18:04:27 +0800199 r = vhost_init_used(&n->vqs[index]);
200
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200201 mutex_unlock(&vq->mutex);
202
Jason Wangf59281d2011-06-21 18:04:27 +0800203 if (r)
204 goto err;
205
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200206 if (oldpriv) {
207 vhost_test_flush_vq(n, index);
208 }
209 }
210
211 mutex_unlock(&n->dev.mutex);
212 return 0;
213
214err:
215 mutex_unlock(&n->dev.mutex);
216 return r;
217}
218
219static long vhost_test_reset_owner(struct vhost_test *n)
220{
221 void *priv = NULL;
222 long err;
Michael S. Tsirkin150b9e52013-04-28 17:12:08 +0300223 struct vhost_memory *memory;
224
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200225 mutex_lock(&n->dev.mutex);
226 err = vhost_dev_check_owner(&n->dev);
227 if (err)
228 goto done;
Michael S. Tsirkin150b9e52013-04-28 17:12:08 +0300229 memory = vhost_dev_reset_owner_prepare();
230 if (!memory) {
231 err = -ENOMEM;
232 goto done;
233 }
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200234 vhost_test_stop(n, &priv);
235 vhost_test_flush(n);
Michael S. Tsirkin150b9e52013-04-28 17:12:08 +0300236 vhost_dev_reset_owner(&n->dev, memory);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200237done:
238 mutex_unlock(&n->dev.mutex);
239 return err;
240}
241
242static int vhost_test_set_features(struct vhost_test *n, u64 features)
243{
Michael S. Tsirkinea16c512014-06-05 15:20:23 +0300244 struct vhost_virtqueue *vq;
245
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200246 mutex_lock(&n->dev.mutex);
247 if ((features & (1 << VHOST_F_LOG_ALL)) &&
248 !vhost_log_access_ok(&n->dev)) {
249 mutex_unlock(&n->dev.mutex);
250 return -EFAULT;
251 }
Michael S. Tsirkinea16c512014-06-05 15:20:23 +0300252 vq = &n->vqs[VHOST_TEST_VQ];
253 mutex_lock(&vq->mutex);
254 vq->acked_features = features;
255 mutex_unlock(&vq->mutex);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200256 mutex_unlock(&n->dev.mutex);
257 return 0;
258}
259
260static long vhost_test_ioctl(struct file *f, unsigned int ioctl,
261 unsigned long arg)
262{
263 struct vhost_test *n = f->private_data;
264 void __user *argp = (void __user *)arg;
265 u64 __user *featurep = argp;
266 int test;
267 u64 features;
268 int r;
269 switch (ioctl) {
270 case VHOST_TEST_RUN:
271 if (copy_from_user(&test, argp, sizeof test))
272 return -EFAULT;
273 return vhost_test_run(n, test);
274 case VHOST_GET_FEATURES:
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300275 features = VHOST_FEATURES;
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200276 if (copy_to_user(featurep, &features, sizeof features))
277 return -EFAULT;
278 return 0;
279 case VHOST_SET_FEATURES:
280 if (copy_from_user(&features, featurep, sizeof features))
281 return -EFAULT;
Michael S. Tsirkin09a34c82013-07-07 17:12:36 +0300282 if (features & ~VHOST_FEATURES)
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200283 return -EOPNOTSUPP;
284 return vhost_test_set_features(n, features);
285 case VHOST_RESET_OWNER:
286 return vhost_test_reset_owner(n);
287 default:
288 mutex_lock(&n->dev.mutex);
Michael S. Tsirkin73640c92013-03-18 13:22:18 +1030289 r = vhost_dev_ioctl(&n->dev, ioctl, argp);
290 if (r == -ENOIOCTLCMD)
291 r = vhost_vring_ioctl(&n->dev, ioctl, argp);
Michael S. Tsirkin71ccc212010-11-29 19:09:01 +0200292 vhost_test_flush(n);
293 mutex_unlock(&n->dev.mutex);
294 return r;
295 }
296}
297
298#ifdef CONFIG_COMPAT
299static long vhost_test_compat_ioctl(struct file *f, unsigned int ioctl,
300 unsigned long arg)
301{
302 return vhost_test_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
303}
304#endif
305
306static const struct file_operations vhost_test_fops = {
307 .owner = THIS_MODULE,
308 .release = vhost_test_release,
309 .unlocked_ioctl = vhost_test_ioctl,
310#ifdef CONFIG_COMPAT
311 .compat_ioctl = vhost_test_compat_ioctl,
312#endif
313 .open = vhost_test_open,
314 .llseek = noop_llseek,
315};
316
317static struct miscdevice vhost_test_misc = {
318 MISC_DYNAMIC_MINOR,
319 "vhost-test",
320 &vhost_test_fops,
321};
322
323static int vhost_test_init(void)
324{
325 return misc_register(&vhost_test_misc);
326}
327module_init(vhost_test_init);
328
329static void vhost_test_exit(void)
330{
331 misc_deregister(&vhost_test_misc);
332}
333module_exit(vhost_test_exit);
334
335MODULE_VERSION("0.0.1");
336MODULE_LICENSE("GPL v2");
337MODULE_AUTHOR("Michael S. Tsirkin");
338MODULE_DESCRIPTION("Host kernel side for virtio simulator");