[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / vhost / test.c

/* Copyright (C) 2009 Red Hat, Inc.
 * Author: Michael S. Tsirkin <mst@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 *
 * test virtio server in host kernel.
 */

#include <linux/compat.h>
#include <linux/eventfd.h>
#include <linux/vhost.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <linux/rcupdate.h>
#include <linux/file.h>
#include <linux/slab.h>

#include "test.h"
#include "vhost.c"

/* Max number of bytes transferred before requeueing the job.
 * Using this limit prevents one virtqueue from starving others. */
#define VHOST_TEST_WEIGHT 0x80000

enum {
	VHOST_TEST_VQ = 0,
	VHOST_TEST_VQ_MAX = 1,
};

struct vhost_test {
	struct vhost_dev dev;
	struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX];
};

/* Expects to be always run from workqueue - which acts as
 * read-size critical section for our kind of RCU. */
static void handle_vq(struct vhost_test *n)
{
	struct vhost_virtqueue *vq = &n->dev.vqs[VHOST_TEST_VQ];
	unsigned out, in;
	int head;
	size_t len, total_len = 0;
	void *private;

	private = rcu_dereference_check(vq->private_data, 1);
	if (!private)
		return;

	mutex_lock(&vq->mutex);
	vhost_disable_notify(&n->dev, vq);

	for (;;) {
		head = vhost_get_vq_desc(&n->dev, vq, vq->iov,
					 ARRAY_SIZE(vq->iov),
					 &out, &in,
					 NULL, NULL);
		/* On error, stop handling until the next kick. */
		if (unlikely(head < 0))
			break;
		/* Nothing new?  Wait for eventfd to tell us they refilled. */
		if (head == vq->num) {
			if (unlikely(vhost_enable_notify(&n->dev, vq))) {
				vhost_disable_notify(&n->dev, vq);
				continue;
			}
			break;
		}
		if (in) {
			vq_err(vq, "Unexpected descriptor format for TX: "
			       "out %d, int %d\n", out, in);
			break;
		}
		len = iov_length(vq->iov, out);
		/* Sanity check */
		if (!len) {
			vq_err(vq, "Unexpected 0 len for TX\n");
			break;
		}
		vhost_add_used_and_signal(&n->dev, vq, head, 0);
		total_len += len;
		if (unlikely(total_len >= VHOST_TEST_WEIGHT)) {
			vhost_poll_queue(&vq->poll);
			break;
		}
	}

	mutex_unlock(&vq->mutex);
}

static void handle_vq_kick(struct vhost_work *work)
{
	struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
						  poll.work);
	struct vhost_test *n = container_of(vq->dev, struct vhost_test, dev);

	handle_vq(n);
}

static int vhost_test_open(struct inode *inode, struct file *f)
{
	struct vhost_test *n = kmalloc(sizeof *n, GFP_KERNEL);
	struct vhost_dev *dev;
	int r;

	if (!n)
		return -ENOMEM;

	dev = &n->dev;
	n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
	r = vhost_dev_init(dev, n->vqs, VHOST_TEST_VQ_MAX);
	if (r < 0) {
		kfree(n);
		return r;
	}

	f->private_data = n;

	return 0;
}

static void *vhost_test_stop_vq(struct vhost_test *n,
				struct vhost_virtqueue *vq)
{
	void *private;

	mutex_lock(&vq->mutex);
	private = rcu_dereference_protected(vq->private_data,
					 lockdep_is_held(&vq->mutex));
	rcu_assign_pointer(vq->private_data, NULL);
	mutex_unlock(&vq->mutex);
	return private;
}

static void vhost_test_stop(struct vhost_test *n, void **privatep)
{
	*privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
}

static void vhost_test_flush_vq(struct vhost_test *n, int index)
{
	vhost_poll_flush(&n->dev.vqs[index].poll);
}

static void vhost_test_flush(struct vhost_test *n)
{
	vhost_test_flush_vq(n, VHOST_TEST_VQ);
}

static int vhost_test_release(struct inode *inode, struct file *f)
{
	struct vhost_test *n = f->private_data;
	void  *private;

	vhost_test_stop(n, &private);
	vhost_test_flush(n);
	vhost_dev_cleanup(&n->dev, false);
	/* We do an extra flush before freeing memory,
	 * since jobs can re-queue themselves. */
	vhost_test_flush(n);
	kfree(n);
	return 0;
}

static long vhost_test_run(struct vhost_test *n, int test)
{
	void *priv, *oldpriv;
	struct vhost_virtqueue *vq;
	int r, index;

	if (test < 0 || test > 1)
		return -EINVAL;

	mutex_lock(&n->dev.mutex);
	r = vhost_dev_check_owner(&n->dev);
	if (r)
		goto err;

	for (index = 0; index < n->dev.nvqs; ++index) {
		/* Verify that ring has been setup correctly. */
		if (!vhost_vq_access_ok(&n->vqs[index])) {
			r = -EFAULT;
			goto err;
		}
	}

	for (index = 0; index < n->dev.nvqs; ++index) {
		vq = n->vqs + index;
		mutex_lock(&vq->mutex);
		priv = test ? n : NULL;

		/* start polling new socket */
		oldpriv = rcu_dereference_protected(vq->private_data,
						    lockdep_is_held(&vq->mutex));
		rcu_assign_pointer(vq->private_data, priv);

		r = vhost_init_used(&n->vqs[index]);

		mutex_unlock(&vq->mutex);

		if (r)
			goto err;

		if (oldpriv) {
			vhost_test_flush_vq(n, index);
		}
	}

	mutex_unlock(&n->dev.mutex);
	return 0;

err:
	mutex_unlock(&n->dev.mutex);
	return r;
}

static long vhost_test_reset_owner(struct vhost_test *n)
{
	void *priv = NULL;
	long err;
	struct vhost_memory *memory;

	mutex_lock(&n->dev.mutex);
	err = vhost_dev_check_owner(&n->dev);
	if (err)
		goto done;
	memory = vhost_dev_reset_owner_prepare();
	if (!memory) {
		err = -ENOMEM;
		goto done;
	}
	vhost_test_stop(n, &priv);
	vhost_test_flush(n);
	vhost_dev_reset_owner(&n->dev, memory);
done:
	mutex_unlock(&n->dev.mutex);
	return err;
}

static int vhost_test_set_features(struct vhost_test *n, u64 features)
{
	mutex_lock(&n->dev.mutex);
	if ((features & (1 << VHOST_F_LOG_ALL)) &&
	    !vhost_log_access_ok(&n->dev)) {
		mutex_unlock(&n->dev.mutex);
		return -EFAULT;
	}
	n->dev.acked_features = features;
	smp_wmb();
	vhost_test_flush(n);
	mutex_unlock(&n->dev.mutex);
	return 0;
}

static long vhost_test_ioctl(struct file *f, unsigned int ioctl,
			     unsigned long arg)
{
	struct vhost_test *n = f->private_data;
	void __user *argp = (void __user *)arg;
	u64 __user *featurep = argp;
	int test;
	u64 features;
	int r;
	switch (ioctl) {
	case VHOST_TEST_RUN:
		if (copy_from_user(&test, argp, sizeof test))
			return -EFAULT;
		return vhost_test_run(n, test);
	case VHOST_GET_FEATURES:
		features = VHOST_NET_FEATURES;
		if (copy_to_user(featurep, &features, sizeof features))
			return -EFAULT;
		return 0;
	case VHOST_SET_FEATURES:
		if (copy_from_user(&features, featurep, sizeof features))
			return -EFAULT;
		if (features & ~VHOST_NET_FEATURES)
			return -EOPNOTSUPP;
		return vhost_test_set_features(n, features);
	case VHOST_RESET_OWNER:
		return vhost_test_reset_owner(n);
	default:
		mutex_lock(&n->dev.mutex);
		r = vhost_dev_ioctl(&n->dev, ioctl, argp);
                if (r == -ENOIOCTLCMD)
                        r = vhost_vring_ioctl(&n->dev, ioctl, argp);
		vhost_test_flush(n);
		mutex_unlock(&n->dev.mutex);
		return r;
	}
}

#ifdef CONFIG_COMPAT
static long vhost_test_compat_ioctl(struct file *f, unsigned int ioctl,
				   unsigned long arg)
{
	return vhost_test_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
}
#endif

static const struct file_operations vhost_test_fops = {
	.owner          = THIS_MODULE,
	.release        = vhost_test_release,
	.unlocked_ioctl = vhost_test_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl   = vhost_test_compat_ioctl,
#endif
	.open           = vhost_test_open,
	.llseek		= noop_llseek,
};

static struct miscdevice vhost_test_misc = {
	MISC_DYNAMIC_MINOR,
	"vhost-test",
	&vhost_test_fops,
};

static int vhost_test_init(void)
{
	return misc_register(&vhost_test_misc);
}
module_init(vhost_test_init);

static void vhost_test_exit(void)
{
	misc_deregister(&vhost_test_misc);
}
module_exit(vhost_test_exit);

MODULE_VERSION("0.0.1");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Michael S. Tsirkin");
MODULE_DESCRIPTION("Host kernel side for virtio simulator");
Commit	Line	Data
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>
	16	#include <linux/rcupdate.h>
	17	#include <linux/file.h>
	18	#include <linux/slab.h>
	19
	20	#include "test.h"
	21	#include "vhost.c"
	22
	23	/* Max number of bytes transferred before requeueing the job.
	24	* Using this limit prevents one virtqueue from starving others. */
	25	#define VHOST_TEST_WEIGHT 0x80000
	26
	27	enum {
	28	VHOST_TEST_VQ = 0,
	29	VHOST_TEST_VQ_MAX = 1,
	30	};
	31
	32	struct vhost_test {
	33	struct vhost_dev dev;
	34	struct vhost_virtqueue vqs[VHOST_TEST_VQ_MAX];
	35	};
	36
	37	/* Expects to be always run from workqueue - which acts as
	38	* read-size critical section for our kind of RCU. */
	39	static void handle_vq(struct vhost_test *n)
	40	{
	41	struct vhost_virtqueue *vq = &n->dev.vqs[VHOST_TEST_VQ];
	42	unsigned out, in;
	43	int head;
	44	size_t len, total_len = 0;
	45	void *private;
	46
	47	private = rcu_dereference_check(vq->private_data, 1);
	48	if (!private)
	49	return;
	50
	51	mutex_lock(&vq->mutex);
8ea8cf89	52	vhost_disable_notify(&n->dev, vq);
71ccc212 MT	53
	54	for (;;) {
	55	head = vhost_get_vq_desc(&n->dev, vq, vq->iov,
	56	ARRAY_SIZE(vq->iov),
	57	&out, &in,
	58	NULL, NULL);
	59	/* On error, stop handling until the next kick. */
	60	if (unlikely(head < 0))
	61	break;
	62	/* Nothing new? Wait for eventfd to tell us they refilled. */
	63	if (head == vq->num) {
8ea8cf89 MT	64	if (unlikely(vhost_enable_notify(&n->dev, vq))) {
8ea8cf89 MT	65	vhost_disable_notify(&n->dev, vq);
71ccc212 MT	66	continue;
	67	}
	68	break;
	69	}
	70	if (in) {
	71	vq_err(vq, "Unexpected descriptor format for TX: "
	72	"out %d, int %d\n", out, in);
	73	break;
	74	}
	75	len = iov_length(vq->iov, out);
	76	/* Sanity check */
	77	if (!len) {
	78	vq_err(vq, "Unexpected 0 len for TX\n");
	79	break;
	80	}
	81	vhost_add_used_and_signal(&n->dev, vq, head, 0);
	82	total_len += len;
	83	if (unlikely(total_len >= VHOST_TEST_WEIGHT)) {
	84	vhost_poll_queue(&vq->poll);
	85	break;
	86	}
	87	}
	88
	89	mutex_unlock(&vq->mutex);
	90	}
	91
	92	static void handle_vq_kick(struct vhost_work *work)
	93	{
	94	struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
	95	poll.work);
	96	struct vhost_test *n = container_of(vq->dev, struct vhost_test, dev);
	97
	98	handle_vq(n);
	99	}
	100
	101	static int vhost_test_open(struct inode inode, struct file f)
	102	{
	103	struct vhost_test n = kmalloc(sizeof n, GFP_KERNEL);
	104	struct vhost_dev *dev;
	105	int r;
	106
	107	if (!n)
	108	return -ENOMEM;
	109
	110	dev = &n->dev;
	111	n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
	112	r = vhost_dev_init(dev, n->vqs, VHOST_TEST_VQ_MAX);
	113	if (r < 0) {
	114	kfree(n);
	115	return r;
	116	}
	117
	118	f->private_data = n;
	119
	120	return 0;
	121	}
	122
	123	static void vhost_test_stop_vq(struct vhost_test n,
	124	struct vhost_virtqueue *vq)
	125	{
	126	void *private;
	127
	128	mutex_lock(&vq->mutex);
	129	private = rcu_dereference_protected(vq->private_data,
130	lockdep_is_held(&vq->mutex));
131	rcu_assign_pointer(vq->private_data, NULL);
132	mutex_unlock(&vq->mutex);
133	return private;
134	}
135
136	static void vhost_test_stop(struct vhost_test n, void *privatep)
137	{
138	*privatep = vhost_test_stop_vq(n, n->vqs + VHOST_TEST_VQ);
139	}
140
141	static void vhost_test_flush_vq(struct vhost_test *n, int index)
142	{
143	vhost_poll_flush(&n->dev.vqs[index].poll);
144	}
145
146	static void vhost_test_flush(struct vhost_test *n)
147	{
148	vhost_test_flush_vq(n, VHOST_TEST_VQ);
149	}
150
151	static int vhost_test_release(struct inode inode, struct file f)
152	{
153	struct vhost_test *n = f->private_data;
154	void *private;
155
156	vhost_test_stop(n, &private);
157	vhost_test_flush(n);
5e7045b0	158	vhost_dev_cleanup(&n->dev, false);
71ccc212 MT	159	/* We do an extra flush before freeing memory,
	160	* since jobs can re-queue themselves. */
	161	vhost_test_flush(n);
	162	kfree(n);
	163	return 0;
	164	}
	165
	166	static long vhost_test_run(struct vhost_test *n, int test)
	167	{
	168	void priv, oldpriv;
	169	struct vhost_virtqueue *vq;
	170	int r, index;
	171
	172	if (test < 0 \|\| test > 1)
	173	return -EINVAL;
	174
	175	mutex_lock(&n->dev.mutex);
	176	r = vhost_dev_check_owner(&n->dev);
	177	if (r)
	178	goto err;
	179
	180	for (index = 0; index < n->dev.nvqs; ++index) {
	181	/* Verify that ring has been setup correctly. */
	182	if (!vhost_vq_access_ok(&n->vqs[index])) {
	183	r = -EFAULT;
	184	goto err;
	185	}
	186	}
	187
	188	for (index = 0; index < n->dev.nvqs; ++index) {
	189	vq = n->vqs + index;
	190	mutex_lock(&vq->mutex);
	191	priv = test ? n : NULL;
	192
	193	/* start polling new socket */
	194	oldpriv = rcu_dereference_protected(vq->private_data,
	195	lockdep_is_held(&vq->mutex));
	196	rcu_assign_pointer(vq->private_data, priv);
	197
f59281da JW	198	r = vhost_init_used(&n->vqs[index]);
f59281da JW	199
71ccc212 MT	200	mutex_unlock(&vq->mutex);
71ccc212 MT	201
f59281da JW	202	if (r)
	203	goto err;
	204
71ccc212 MT	205	if (oldpriv) {
	206	vhost_test_flush_vq(n, index);
	207	}
	208	}
	209
	210	mutex_unlock(&n->dev.mutex);
	211	return 0;
	212
	213	err:
	214	mutex_unlock(&n->dev.mutex);
	215	return r;
	216	}
	217
	218	static long vhost_test_reset_owner(struct vhost_test *n)
	219	{
	220	void *priv = NULL;
	221	long err;
150b9e51 MT	222	struct vhost_memory *memory;
150b9e51 MT	223
71ccc212 MT	224	mutex_lock(&n->dev.mutex);
	225	err = vhost_dev_check_owner(&n->dev);
	226	if (err)
	227	goto done;
150b9e51 MT	228	memory = vhost_dev_reset_owner_prepare();
	229	if (!memory) {
	230	err = -ENOMEM;
	231	goto done;
	232	}
71ccc212 MT	233	vhost_test_stop(n, &priv);
71ccc212 MT	234	vhost_test_flush(n);
150b9e51	235	vhost_dev_reset_owner(&n->dev, memory);
71ccc212 MT	236	done:
	237	mutex_unlock(&n->dev.mutex);
	238	return err;
	239	}
	240
	241	static int vhost_test_set_features(struct vhost_test *n, u64 features)
	242	{
	243	mutex_lock(&n->dev.mutex);
	244	if ((features & (1 << VHOST_F_LOG_ALL)) &&
	245	!vhost_log_access_ok(&n->dev)) {
	246	mutex_unlock(&n->dev.mutex);
	247	return -EFAULT;
	248	}
	249	n->dev.acked_features = features;
	250	smp_wmb();
	251	vhost_test_flush(n);
	252	mutex_unlock(&n->dev.mutex);
	253	return 0;
	254	}
	255
	256	static long vhost_test_ioctl(struct file *f, unsigned int ioctl,
	257	unsigned long arg)
	258	{
	259	struct vhost_test *n = f->private_data;
	260	void __user argp = (void __user )arg;
	261	u64 __user *featurep = argp;
	262	int test;
	263	u64 features;
	264	int r;
	265	switch (ioctl) {
	266	case VHOST_TEST_RUN:
	267	if (copy_from_user(&test, argp, sizeof test))
	268	return -EFAULT;
	269	return vhost_test_run(n, test);
	270	case VHOST_GET_FEATURES:
0dd05a3b	271	features = VHOST_NET_FEATURES;
71ccc212 MT	272	if (copy_to_user(featurep, &features, sizeof features))
	273	return -EFAULT;
	274	return 0;
	275	case VHOST_SET_FEATURES:
	276	if (copy_from_user(&features, featurep, sizeof features))
	277	return -EFAULT;
0dd05a3b	278	if (features & ~VHOST_NET_FEATURES)
71ccc212 MT	279	return -EOPNOTSUPP;
	280	return vhost_test_set_features(n, features);
	281	case VHOST_RESET_OWNER:
	282	return vhost_test_reset_owner(n);
	283	default:
	284	mutex_lock(&n->dev.mutex);
73640c99 MT	285	r = vhost_dev_ioctl(&n->dev, ioctl, argp);
	286	if (r == -ENOIOCTLCMD)
	287	r = vhost_vring_ioctl(&n->dev, ioctl, argp);
71ccc212 MT	288	vhost_test_flush(n);
	289	mutex_unlock(&n->dev.mutex);
	290	return r;
	291	}
	292	}
	293
	294	#ifdef CONFIG_COMPAT
	295	static long vhost_test_compat_ioctl(struct file *f, unsigned int ioctl,
	296	unsigned long arg)
	297	{
	298	return vhost_test_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
	299	}
	300	#endif
	301
	302	static const struct file_operations vhost_test_fops = {
	303	.owner = THIS_MODULE,
	304	.release = vhost_test_release,
	305	.unlocked_ioctl = vhost_test_ioctl,
	306	#ifdef CONFIG_COMPAT
	307	.compat_ioctl = vhost_test_compat_ioctl,
	308	#endif
	309	.open = vhost_test_open,
	310	.llseek = noop_llseek,
	311	};
	312
	313	static struct miscdevice vhost_test_misc = {
	314	MISC_DYNAMIC_MINOR,
	315	"vhost-test",
	316	&vhost_test_fops,
	317	};
	318
	319	static int vhost_test_init(void)
	320	{
	321	return misc_register(&vhost_test_misc);
	322	}
	323	module_init(vhost_test_init);
	324
	325	static void vhost_test_exit(void)
	326	{
	327	misc_deregister(&vhost_test_misc);
	328	}
	329	module_exit(vhost_test_exit);
	330
	331	MODULE_VERSION("0.0.1");
	332	MODULE_LICENSE("GPL v2");
	333	MODULE_AUTHOR("Michael S. Tsirkin");
	334	MODULE_DESCRIPTION("Host kernel side for virtio simulator");