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authorMichael S. Tsirkin2010-11-29 11:16:37 -0600
committerMichael S. Tsirkin2010-12-09 08:00:22 -0600
commit4e53f78e5b06c073a5c10814c72e98c1ca8a9f10 (patch)
tree2c3f60a3e159b6871c7e4d2e98b1c18bcf384ebb /tools/virtio
parent71ccc212e5b28dfcc870b6db6589c2df264fdc6a (diff)
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tools/virtio: virtio_test tool
This is the userspace part of the tool: it includes a bunch of stubs for linux APIs, somewhat simular to linuxsched. This makes it possible to recompile the ring code in userspace. A small test example is implemented combining this with vhost_test module. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'tools/virtio')
-rw-r--r--tools/virtio/Makefile12
-rw-r--r--tools/virtio/linux/device.h2
-rw-r--r--tools/virtio/linux/slab.h2
-rw-r--r--tools/virtio/linux/virtio.h223
-rw-r--r--tools/virtio/virtio_test.c248
5 files changed, 487 insertions, 0 deletions
diff --git a/tools/virtio/Makefile b/tools/virtio/Makefile
new file mode 100644
index 000000000000..d1d442ed106a
--- /dev/null
+++ b/tools/virtio/Makefile
@@ -0,0 +1,12 @@
1all: test mod
2test: virtio_test
3virtio_test: virtio_ring.o virtio_test.o
4CFLAGS += -g -O2 -Wall -I. -I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow -MMD
5vpath %.c ../../drivers/virtio
6mod:
7 ${MAKE} -C `pwd`/../.. M=`pwd`/vhost_test
8.PHONY: all test mod clean
9clean:
10 ${RM} *.o vhost_test/*.o vhost_test/.*.cmd \
11 vhost_test/Module.symvers vhost_test/modules.order *.d
12-include *.d
diff --git a/tools/virtio/linux/device.h b/tools/virtio/linux/device.h
new file mode 100644
index 000000000000..4ad7e1df0db5
--- /dev/null
+++ b/tools/virtio/linux/device.h
@@ -0,0 +1,2 @@
1#ifndef LINUX_DEVICE_H
2#endif
diff --git a/tools/virtio/linux/slab.h b/tools/virtio/linux/slab.h
new file mode 100644
index 000000000000..81baeac8ae40
--- /dev/null
+++ b/tools/virtio/linux/slab.h
@@ -0,0 +1,2 @@
1#ifndef LINUX_SLAB_H
2#endif
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
new file mode 100644
index 000000000000..669bcdd45805
--- /dev/null
+++ b/tools/virtio/linux/virtio.h
@@ -0,0 +1,223 @@
1#ifndef LINUX_VIRTIO_H
2#define LINUX_VIRTIO_H
3
4#include <stdbool.h>
5#include <stdlib.h>
6#include <stddef.h>
7#include <stdio.h>
8#include <string.h>
9#include <assert.h>
10
11#include <linux/types.h>
12#include <errno.h>
13
14typedef unsigned long long dma_addr_t;
15
16struct scatterlist {
17 unsigned long page_link;
18 unsigned int offset;
19 unsigned int length;
20 dma_addr_t dma_address;
21};
22
23struct page {
24 unsigned long long dummy;
25};
26
27#define BUG_ON(__BUG_ON_cond) assert(!(__BUG_ON_cond))
28
29/* Physical == Virtual */
30#define virt_to_phys(p) ((unsigned long)p)
31#define phys_to_virt(a) ((void *)(unsigned long)(a))
32/* Page address: Virtual / 4K */
33#define virt_to_page(p) ((struct page*)((virt_to_phys(p) / 4096) * \
34 sizeof(struct page)))
35#define offset_in_page(p) (((unsigned long)p) % 4096)
36#define sg_phys(sg) ((sg->page_link & ~0x3) / sizeof(struct page) * 4096 + \
37 sg->offset)
38static inline void sg_mark_end(struct scatterlist *sg)
39{
40 /*
41 * Set termination bit, clear potential chain bit
42 */
43 sg->page_link |= 0x02;
44 sg->page_link &= ~0x01;
45}
46static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
47{
48 memset(sgl, 0, sizeof(*sgl) * nents);
49 sg_mark_end(&sgl[nents - 1]);
50}
51static inline void sg_assign_page(struct scatterlist *sg, struct page *page)
52{
53 unsigned long page_link = sg->page_link & 0x3;
54
55 /*
56 * In order for the low bit stealing approach to work, pages
57 * must be aligned at a 32-bit boundary as a minimum.
58 */
59 BUG_ON((unsigned long) page & 0x03);
60 sg->page_link = page_link | (unsigned long) page;
61}
62
63static inline void sg_set_page(struct scatterlist *sg, struct page *page,
64 unsigned int len, unsigned int offset)
65{
66 sg_assign_page(sg, page);
67 sg->offset = offset;
68 sg->length = len;
69}
70
71static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
72 unsigned int buflen)
73{
74 sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
75}
76
77static inline void sg_init_one(struct scatterlist *sg, const void *buf, unsigned int buflen)
78{
79 sg_init_table(sg, 1);
80 sg_set_buf(sg, buf, buflen);
81}
82
83typedef __u16 u16;
84
85typedef enum {
86 GFP_KERNEL,
87 GFP_ATOMIC,
88} gfp_t;
89typedef enum {
90 IRQ_NONE,
91 IRQ_HANDLED
92} irqreturn_t;
93
94static inline void *kmalloc(size_t s, gfp_t gfp)
95{
96 return malloc(s);
97}
98
99static inline void kfree(void *p)
100{
101 free(p);
102}
103
104#define container_of(ptr, type, member) ({ \
105 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
106 (type *)( (char *)__mptr - offsetof(type,member) );})
107
108#define uninitialized_var(x) x = x
109
110# ifndef likely
111# define likely(x) (__builtin_expect(!!(x), 1))
112# endif
113# ifndef unlikely
114# define unlikely(x) (__builtin_expect(!!(x), 0))
115# endif
116
117#define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
118#ifdef DEBUG
119#define pr_debug(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
120#else
121#define pr_debug(format, ...) do {} while (0)
122#endif
123#define dev_err(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
124#define dev_warn(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
125
126/* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
127#define list_add_tail(a, b) do {} while (0)
128#define list_del(a) do {} while (0)
129
130#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
131#define BITS_PER_BYTE 8
132#define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE)
133#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
134/* TODO: Not atomic as it should be:
135 * we don't use this for anything important. */
136static inline void clear_bit(int nr, volatile unsigned long *addr)
137{
138 unsigned long mask = BIT_MASK(nr);
139 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
140
141 *p &= ~mask;
142}
143
144static inline int test_bit(int nr, const volatile unsigned long *addr)
145{
146 return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
147}
148
149/* The only feature we care to support */
150#define virtio_has_feature(dev, feature) \
151 test_bit((feature), (dev)->features)
152/* end of stubs */
153
154struct virtio_device {
155 void *dev;
156 unsigned long features[1];
157};
158
159struct virtqueue {
160 /* TODO: commented as list macros are empty stubs for now.
161 * Broken but enough for virtio_ring.c
162 * struct list_head list; */
163 void (*callback)(struct virtqueue *vq);
164 const char *name;
165 struct virtio_device *vdev;
166 void *priv;
167};
168
169#define EXPORT_SYMBOL_GPL(__EXPORT_SYMBOL_GPL_name) \
170 void __EXPORT_SYMBOL_GPL##__EXPORT_SYMBOL_GPL_name() { \
171}
172#define MODULE_LICENSE(__MODULE_LICENSE_value) \
173 const char *__MODULE_LICENSE_name = __MODULE_LICENSE_value
174
175#define CONFIG_SMP
176
177#if defined(__i386__) || defined(__x86_64__)
178#define barrier() asm volatile("" ::: "memory")
179#define mb() __sync_synchronize()
180
181#define smp_mb() mb()
182# define smp_rmb() barrier()
183# define smp_wmb() barrier()
184#else
185#error Please fill in barrier macros
186#endif
187
188/* Interfaces exported by virtio_ring. */
189int virtqueue_add_buf_gfp(struct virtqueue *vq,
190 struct scatterlist sg[],
191 unsigned int out_num,
192 unsigned int in_num,
193 void *data,
194 gfp_t gfp);
195
196static inline int virtqueue_add_buf(struct virtqueue *vq,
197 struct scatterlist sg[],
198 unsigned int out_num,
199 unsigned int in_num,
200 void *data)
201{
202 return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
203}
204
205void virtqueue_kick(struct virtqueue *vq);
206
207void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
208
209void virtqueue_disable_cb(struct virtqueue *vq);
210
211bool virtqueue_enable_cb(struct virtqueue *vq);
212
213void *virtqueue_detach_unused_buf(struct virtqueue *vq);
214struct virtqueue *vring_new_virtqueue(unsigned int num,
215 unsigned int vring_align,
216 struct virtio_device *vdev,
217 void *pages,
218 void (*notify)(struct virtqueue *vq),
219 void (*callback)(struct virtqueue *vq),
220 const char *name);
221void vring_del_virtqueue(struct virtqueue *vq);
222
223#endif
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
new file mode 100644
index 000000000000..df0c6d2c3860
--- /dev/null
+++ b/tools/virtio/virtio_test.c
@@ -0,0 +1,248 @@
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"
17
18struct 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;
27};
28
29struct 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;
38};
39
40void vq_notify(struct virtqueue *vq)
41{
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);
47}
48
49void vq_callback(struct virtqueue *vq)
50{
51}
52
53
54void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
55{
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,
64 };
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);
82}
83
84static void vq_info_add(struct vdev_info *dev, int num)
85{
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, info->ring,
96 vq_notify, vq_callback, "test");
97 assert(info->vq);
98 info->vq->priv = info;
99 vhost_vq_setup(dev, info);
100 dev->fds[info->idx].fd = info->call;
101 dev->fds[info->idx].events = POLLIN;
102 dev->nvqs++;
103}
104
105static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
106{
107 int r;
108 memset(dev, 0, sizeof *dev);
109 dev->vdev.features[0] = features;
110 dev->vdev.features[1] = features >> 32;
111 dev->buf_size = 1024;
112 dev->buf = malloc(dev->buf_size);
113 assert(dev->buf);
114 dev->control = open("/dev/vhost-test", O_RDWR);
115 assert(dev->control >= 0);
116 r = ioctl(dev->control, VHOST_SET_OWNER, NULL);
117 assert(r >= 0);
118 dev->mem = malloc(offsetof(struct vhost_memory, regions) +
119 sizeof dev->mem->regions[0]);
120 assert(dev->mem);
121 memset(dev->mem, 0, offsetof(struct vhost_memory, regions) +
122 sizeof dev->mem->regions[0]);
123 dev->mem->nregions = 1;
124 dev->mem->regions[0].guest_phys_addr = (long)dev->buf;
125 dev->mem->regions[0].userspace_addr = (long)dev->buf;
126 dev->mem->regions[0].memory_size = dev->buf_size;
127 r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
128 assert(r >= 0);
129}
130
131/* TODO: this is pretty bad: we get a cache line bounce
132 * for the wait queue on poll and another one on read,
133 * plus the read which is there just to clear the
134 * current state. */
135static void wait_for_interrupt(struct vdev_info *dev)
136{
137 int i;
138 unsigned long long val;
139 poll(dev->fds, dev->nvqs, -1);
140 for (i = 0; i < dev->nvqs; ++i)
141 if (dev->fds[i].revents & POLLIN) {
142 read(dev->fds[i].fd, &val, sizeof val);
143 }
144}
145
146static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
147{
148 struct scatterlist sl;
149 long started = 0, completed = 0;
150 long completed_before;
151 int r, test = 1;
152 unsigned len;
153 long long spurious = 0;
154 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
155 assert(r >= 0);
156 for (;;) {
157 virtqueue_disable_cb(vq->vq);
158 completed_before = completed;
159 do {
160 if (started < bufs) {
161 sg_init_one(&sl, dev->buf, dev->buf_size);
162 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
163 dev->buf + started);
164 if (likely(r >= 0)) {
165 ++started;
166 virtqueue_kick(vq->vq);
167 }
168 } else
169 r = -1;
170
171 /* Flush out completed bufs if any */
172 if (virtqueue_get_buf(vq->vq, &len)) {
173 ++completed;
174 r = 0;
175 }
176
177 } while (r >= 0);
178 if (completed == completed_before)
179 ++spurious;
180 assert(completed <= bufs);
181 assert(started <= bufs);
182 if (completed == bufs)
183 break;
184 if (virtqueue_enable_cb(vq->vq)) {
185 wait_for_interrupt(dev);
186 }
187 }
188 test = 0;
189 r = ioctl(dev->control, VHOST_TEST_RUN, &test);
190 assert(r >= 0);
191 fprintf(stderr, "spurious wakeus: 0x%llx\n", spurious);
192}
193
194const char optstring[] = "h";
195const struct option longopts[] = {
196 {
197 .name = "help",
198 .val = 'h',
199 },
200 {
201 .name = "indirect",
202 .val = 'I',
203 },
204 {
205 .name = "no-indirect",
206 .val = 'i',
207 },
208 {
209 }
210};
211
212static void help()
213{
214 fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n");
215}
216
217int main(int argc, char **argv)
218{
219 struct vdev_info dev;
220 unsigned long long features = 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
221 int o;
222
223 for (;;) {
224 o = getopt_long(argc, argv, optstring, longopts, NULL);
225 switch (o) {
226 case -1:
227 goto done;
228 case '?':
229 help();
230 exit(2);
231 case 'h':
232 help();
233 goto done;
234 case 'i':
235 features &= ~(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
236 break;
237 default:
238 assert(0);
239 break;
240 }
241 }
242
243done:
244 vdev_info_init(&dev, features);
245 vq_info_add(&dev, 256);
246 run_test(&dev, &dev.vqs[0], 0x100000);
247 return 0;
248}