[linux-2.6-block.git] / tools / virtio / virtio_test.c

#define _GNU_SOURCE
#include <getopt.h>
#include <string.h>
#include <poll.h>
#include <sys/eventfd.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdbool.h>
#include <linux/vhost.h>
#include <linux/virtio.h>
#include <linux/virtio_ring.h>
#include "../../drivers/vhost/test.h"

/* Unused */
void *__kmalloc_fake, *__kfree_ignore_start, *__kfree_ignore_end;

struct vq_info {
	int kick;
	int call;
	int num;
	int idx;
	void *ring;
	/* copy used for control */
	struct vring vring;
	struct virtqueue *vq;
};

struct vdev_info {
	struct virtio_device vdev;
	int control;
	struct pollfd fds[1];
	struct vq_info vqs[1];
	int nvqs;
	void *buf;
	size_t buf_size;
	struct vhost_memory *mem;
};

bool vq_notify(struct virtqueue *vq)
{
	struct vq_info *info = vq->priv;
	unsigned long long v = 1;
	int r;
	r = write(info->kick, &v, sizeof v);
	assert(r == sizeof v);
	return true;
}

void vq_callback(struct virtqueue *vq)
{
}


void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
{
	struct vhost_vring_state state = { .index = info->idx };
	struct vhost_vring_file file = { .index = info->idx };
	unsigned long long features = dev->vdev.features[0];
	struct vhost_vring_addr addr = {
		.index = info->idx,
		.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
		.avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
		.used_user_addr = (uint64_t)(unsigned long)info->vring.used,
	};
	int r;
	r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
	assert(r >= 0);
	state.num = info->vring.num;
	r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
	assert(r >= 0);
	state.num = 0;
	r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
	assert(r >= 0);
	r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
	assert(r >= 0);
	file.fd = info->kick;
	r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
	assert(r >= 0);
	file.fd = info->call;
	r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
	assert(r >= 0);
}

static void vq_info_add(struct vdev_info *dev, int num)
{
	struct vq_info *info = &dev->vqs[dev->nvqs];
	int r;
	info->idx = dev->nvqs;
	info->kick = eventfd(0, EFD_NONBLOCK);
	info->call = eventfd(0, EFD_NONBLOCK);
	r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
	assert(r >= 0);
	memset(info->ring, 0, vring_size(num, 4096));
	vring_init(&info->vring, num, info->ring, 4096);
	info->vq = vring_new_virtqueue(info->idx,
				       info->vring.num, 4096, &dev->vdev,
				       true, info->ring,
				       vq_notify, vq_callback, "test");
	assert(info->vq);
	info->vq->priv = info;
	vhost_vq_setup(dev, info);
	dev->fds[info->idx].fd = info->call;
	dev->fds[info->idx].events = POLLIN;
	dev->nvqs++;
}

static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
{
	int r;
	memset(dev, 0, sizeof *dev);
	dev->vdev.features[0] = features;
	dev->vdev.features[1] = features >> 32;
	dev->buf_size = 1024;
	dev->buf = malloc(dev->buf_size);
	assert(dev->buf);
        dev->control = open("/dev/vhost-test", O_RDWR);
	assert(dev->control >= 0);
	r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
	assert(r >= 0);
	dev->mem = malloc(offsetof(struct vhost_memory, regions) +
			  sizeof dev->mem->regions[0]);
	assert(dev->mem);
	memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
                          sizeof dev->mem->regions[0]);
	dev->mem->nregions = 1;
	dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
	dev->mem->regions[0].userspace_addr = (long)dev->buf;
	dev->mem->regions[0].memory_size = dev->buf_size;
	r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
	assert(r >= 0);
}

/* TODO: this is pretty bad: we get a cache line bounce
 * for the wait queue on poll and another one on read,
 * plus the read which is there just to clear the
 * current state. */
static void wait_for_interrupt(struct vdev_info *dev)
{
	int i;
	unsigned long long val;
	poll(dev->fds, dev->nvqs, -1);
	for (i = 0; i < dev->nvqs; ++i)
		if (dev->fds[i].revents & POLLIN) {
			read(dev->fds[i].fd, &val, sizeof val);
		}
}

static void run_test(struct vdev_info *dev, struct vq_info *vq,
		     bool delayed, int bufs)
{
	struct scatterlist sl;
	long started = 0, completed = 0;
	long completed_before;
	int r, test = 1;
	unsigned len;
	long long spurious = 0;
	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
	assert(r >= 0);
	for (;;) {
		virtqueue_disable_cb(vq->vq);
		completed_before = completed;
		do {
			if (started < bufs) {
				sg_init_one(&sl, dev->buf, dev->buf_size);
				r = virtqueue_add_outbuf(vq->vq, &sl, 1,
							 dev->buf + started,
							 GFP_ATOMIC);
				if (likely(r == 0)) {
					++started;
					if (unlikely(!virtqueue_kick(vq->vq)))
						r = -1;
				}
			} else
				r = -1;

			/* Flush out completed bufs if any */
			if (virtqueue_get_buf(vq->vq, &len)) {
				++completed;
				r = 0;
			}

		} while (r == 0);
		if (completed == completed_before)
			++spurious;
		assert(completed <= bufs);
		assert(started <= bufs);
		if (completed == bufs)
			break;
		if (delayed) {
			if (virtqueue_enable_cb_delayed(vq->vq))
				wait_for_interrupt(dev);
		} else {
			if (virtqueue_enable_cb(vq->vq))
				wait_for_interrupt(dev);
		}
	}
	test = 0;
	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
	assert(r >= 0);
	fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
}

const char optstring[] = "h";
const struct option longopts[] = {
	{
		.name = "help",
		.val = 'h',
	},
	{
		.name = "event-idx",
		.val = 'E',
	},
	{
		.name = "no-event-idx",
		.val = 'e',
	},
	{
		.name = "indirect",
		.val = 'I',
	},
	{
		.name = "no-indirect",
		.val = 'i',
	},
	{
		.name = "delayed-interrupt",
		.val = 'D',
	},
	{
		.name = "no-delayed-interrupt",
		.val = 'd',
	},
	{
	}
};

static void help(void)
{
	fprintf(stderr, "Usage: virtio_test [--help]"
		" [--no-indirect]"
		" [--no-event-idx]"
		" [--delayed-interrupt]"
		"\n");
}

int main(int argc, char **argv)
{
	struct vdev_info dev;
	unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
		(1ULL << VIRTIO_RING_F_EVENT_IDX);
	int o;
	bool delayed = false;

	for (;;) {
		o = getopt_long(argc, argv, optstring, longopts, NULL);
		switch (o) {
		case -1:
			goto done;
		case '?':
			help();
			exit(2);
		case 'e':
			features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
			break;
		case 'h':
			help();
			goto done;
		case 'i':
			features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
			break;
		case 'D':
			delayed = true;
			break;
		default:
			assert(0);
			break;
		}
	}

done:
	vdev_info_init(&dev, features);
	vq_info_add(&dev, 256);
	run_test(&dev, &dev.vqs[0], delayed, 0x100000);
	return 0;
}
Commit	Line	Data
4e53f78e MT	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>
61d0b5a4	13	#include <stdbool.h>
4e53f78e MT	14	#include <linux/vhost.h>
	15	#include <linux/virtio.h>
	16	#include <linux/virtio_ring.h>
	17	#include "../../drivers/vhost/test.h"
	18
61d0b5a4 RR	19	/* Unused */
	20	void __kmalloc_fake, __kfree_ignore_start, *__kfree_ignore_end;
	21
4e53f78e MT	22	struct vq_info {
	23	int kick;
	24	int call;
	25	int num;
	26	int idx;
	27	void *ring;
	28	/* copy used for control */
	29	struct vring vring;
	30	struct virtqueue *vq;
	31	};
	32
	33	struct vdev_info {
	34	struct virtio_device vdev;
	35	int control;
	36	struct pollfd fds[1];
	37	struct vq_info vqs[1];
	38	int nvqs;
	39	void *buf;
	40	size_t buf_size;
	41	struct vhost_memory *mem;
	42	};
	43
46f9c2b9	44	bool vq_notify(struct virtqueue *vq)
4e53f78e MT	45	{
	46	struct vq_info *info = vq->priv;
	47	unsigned long long v = 1;
	48	int r;
	49	r = write(info->kick, &v, sizeof v);
	50	assert(r == sizeof v);
46f9c2b9	51	return true;
4e53f78e MT	52	}
	53
	54	void vq_callback(struct virtqueue *vq)
	55	{
	56	}
	57
	58
	59	void vhost_vq_setup(struct vdev_info dev, struct vq_info info)
	60	{
	61	struct vhost_vring_state state = { .index = info->idx };
	62	struct vhost_vring_file file = { .index = info->idx };
	63	unsigned long long features = dev->vdev.features[0];
	64	struct vhost_vring_addr addr = {
	65	.index = info->idx,
	66	.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
	67	.avail_user_addr = (uint64_t)(unsigned long)info->vring.avail,
	68	.used_user_addr = (uint64_t)(unsigned long)info->vring.used,
	69	};
	70	int r;
	71	r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
	72	assert(r >= 0);
	73	state.num = info->vring.num;
	74	r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
	75	assert(r >= 0);
	76	state.num = 0;
	77	r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
	78	assert(r >= 0);
	79	r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
	80	assert(r >= 0);
	81	file.fd = info->kick;
	82	r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
	83	assert(r >= 0);
	84	file.fd = info->call;
	85	r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
	86	assert(r >= 0);
	87	}
	88
	89	static void vq_info_add(struct vdev_info *dev, int num)
	90	{
	91	struct vq_info *info = &dev->vqs[dev->nvqs];
	92	int r;
	93	info->idx = dev->nvqs;
	94	info->kick = eventfd(0, EFD_NONBLOCK);
	95	info->call = eventfd(0, EFD_NONBLOCK);
	96	r = posix_memalign(&info->ring, 4096, vring_size(num, 4096));
	97	assert(r >= 0);
	98	memset(info->ring, 0, vring_size(num, 4096));
	99	vring_init(&info->vring, num, info->ring, 4096);
73640c99 MT	100	info->vq = vring_new_virtqueue(info->idx,
73640c99 MT	101	info->vring.num, 4096, &dev->vdev,
7b21e34f	102	true, info->ring,
4e53f78e MT	103	vq_notify, vq_callback, "test");
	104	assert(info->vq);
	105	info->vq->priv = info;
	106	vhost_vq_setup(dev, info);
	107	dev->fds[info->idx].fd = info->call;
	108	dev->fds[info->idx].events = POLLIN;
	109	dev->nvqs++;
	110	}
	111
	112	static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
	113	{
	114	int r;
	115	memset(dev, 0, sizeof *dev);
	116	dev->vdev.features[0] = features;
	117	dev->vdev.features[1] = features >> 32;
	118	dev->buf_size = 1024;
	119	dev->buf = malloc(dev->buf_size);
	120	assert(dev->buf);
	121	dev->control = open("/dev/vhost-test", O_RDWR);
	122	assert(dev->control >= 0);
	123	r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
	124	assert(r >= 0);
	125	dev->mem = malloc(offsetof(struct vhost_memory, regions) +
	126	sizeof dev->mem->regions[0]);
	127	assert(dev->mem);
	128	memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
	129	sizeof dev->mem->regions[0]);
	130	dev->mem->nregions = 1;
	131	dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
	132	dev->mem->regions[0].userspace_addr = (long)dev->buf;
	133	dev->mem->regions[0].memory_size = dev->buf_size;
	134	r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
	135	assert(r >= 0);
	136	}
	137
	138	/* TODO: this is pretty bad: we get a cache line bounce
	139	* for the wait queue on poll and another one on read,
	140	* plus the read which is there just to clear the
	141	* current state. */
	142	static void wait_for_interrupt(struct vdev_info *dev)
	143	{
	144	int i;
	145	unsigned long long val;
	146	poll(dev->fds, dev->nvqs, -1);
	147	for (i = 0; i < dev->nvqs; ++i)
	148	if (dev->fds[i].revents & POLLIN) {
	149	read(dev->fds[i].fd, &val, sizeof val);
	150	}
	151	}
	152
64d09888 MT	153	static void run_test(struct vdev_info dev, struct vq_info vq,
64d09888 MT	154	bool delayed, int bufs)
4e53f78e MT	155	{
	156	struct scatterlist sl;
	157	long started = 0, completed = 0;
	158	long completed_before;
	159	int r, test = 1;
	160	unsigned len;
	161	long long spurious = 0;
	162	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
	163	assert(r >= 0);
	164	for (;;) {
	165	virtqueue_disable_cb(vq->vq);
	166	completed_before = completed;
	167	do {
	168	if (started < bufs) {
	169	sg_init_one(&sl, dev->buf, dev->buf_size);
cf994e0a RR	170	r = virtqueue_add_outbuf(vq->vq, &sl, 1,
	171	dev->buf + started,
	172	GFP_ATOMIC);
de929b04	173	if (likely(r == 0)) {
4e53f78e	174	++started;
be40d5cc	175	if (unlikely(!virtqueue_kick(vq->vq)))
53c18c99	176	r = -1;
4e53f78e MT	177	}
	178	} else
	179	r = -1;
	180
	181	/* Flush out completed bufs if any */
	182	if (virtqueue_get_buf(vq->vq, &len)) {
	183	++completed;
	184	r = 0;
	185	}
	186
de929b04	187	} while (r == 0);
4e53f78e MT	188	if (completed == completed_before)
	189	++spurious;
	190	assert(completed <= bufs);
	191	assert(started <= bufs);
	192	if (completed == bufs)
	193	break;
64d09888 MT	194	if (delayed) {
	195	if (virtqueue_enable_cb_delayed(vq->vq))
	196	wait_for_interrupt(dev);
	197	} else {
	198	if (virtqueue_enable_cb(vq->vq))
	199	wait_for_interrupt(dev);
4e53f78e MT	200	}
	201	}
	202	test = 0;
	203	r = ioctl(dev->control, VHOST_TEST_RUN, &test);
	204	assert(r >= 0);
	205	fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
	206	}
	207
	208	const char optstring[] = "h";
	209	const struct option longopts[] = {
	210	{
	211	.name = "help",
	212	.val = 'h',
	213	},
4423fe40 MT	214	{
	215	.name = "event-idx",
	216	.val = 'E',
	217	},
	218	{
	219	.name = "no-event-idx",
	220	.val = 'e',
	221	},
4e53f78e MT	222	{
	223	.name = "indirect",
	224	.val = 'I',
	225	},
	226	{
	227	.name = "no-indirect",
	228	.val = 'i',
	229	},
64d09888 MT	230	{
	231	.name = "delayed-interrupt",
	232	.val = 'D',
	233	},
	234	{
	235	.name = "no-delayed-interrupt",
	236	.val = 'd',
	237	},
4e53f78e MT	238	{
	239	}
	240	};
	241
4a7d6455	242	static void help(void)
4e53f78e	243	{
4423fe40 MT	244	fprintf(stderr, "Usage: virtio_test [--help]"
	245	" [--no-indirect]"
	246	" [--no-event-idx]"
64d09888	247	" [--delayed-interrupt]"
4423fe40	248	"\n");
4e53f78e MT	249	}
	250
	251	int main(int argc, char **argv)
	252	{
	253	struct vdev_info dev;
4423fe40 MT	254	unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) \|
4423fe40 MT	255	(1ULL << VIRTIO_RING_F_EVENT_IDX);
4e53f78e	256	int o;
64d09888	257	bool delayed = false;
4e53f78e MT	258
	259	for (;;) {
	260	o = getopt_long(argc, argv, optstring, longopts, NULL);
	261	switch (o) {
	262	case -1:
	263	goto done;
	264	case '?':
	265	help();
	266	exit(2);
4423fe40 MT	267	case 'e':
	268	features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
	269	break;
4e53f78e MT	270	case 'h':
	271	help();
	272	goto done;
	273	case 'i':
	274	features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
	275	break;
64d09888 MT	276	case 'D':
	277	delayed = true;
	278	break;
4e53f78e MT	279	default:
	280	assert(0);
	281	break;
	282	}
	283	}
	284
	285	done:
	286	vdev_info_init(&dev, features);
	287	vq_info_add(&dev, 256);
64d09888	288	run_test(&dev, &dev.vqs[0], delayed, 0x100000);
4e53f78e MT	289	return 0;
4e53f78e MT	290	}