1
2
3
4
5
6
7
8
9
10#include "qemu/osdep.h"
11#include "libqtest.h"
12#include "libqos/virtio.h"
13#include "standard-headers/linux/virtio_config.h"
14#include "standard-headers/linux/virtio_ring.h"
15
16uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
17{
18 return d->bus->config_readb(d, addr);
19}
20
21uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr)
22{
23 return d->bus->config_readw(d, addr);
24}
25
26uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr)
27{
28 return d->bus->config_readl(d, addr);
29}
30
31uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr)
32{
33 return d->bus->config_readq(d, addr);
34}
35
36uint32_t qvirtio_get_features(QVirtioDevice *d)
37{
38 return d->bus->get_features(d);
39}
40
41void qvirtio_set_features(QVirtioDevice *d, uint32_t features)
42{
43 d->features = features;
44 d->bus->set_features(d, features);
45}
46
47QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
48 QGuestAllocator *alloc, uint16_t index)
49{
50 return d->bus->virtqueue_setup(d, alloc, index);
51}
52
53void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
54 QGuestAllocator *alloc)
55{
56 return bus->virtqueue_cleanup(vq, alloc);
57}
58
59void qvirtio_reset(QVirtioDevice *d)
60{
61 d->bus->set_status(d, 0);
62 g_assert_cmphex(d->bus->get_status(d), ==, 0);
63}
64
65void qvirtio_set_acknowledge(QVirtioDevice *d)
66{
67 d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_ACKNOWLEDGE);
68 g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_ACKNOWLEDGE);
69}
70
71void qvirtio_set_driver(QVirtioDevice *d)
72{
73 d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER);
74 g_assert_cmphex(d->bus->get_status(d), ==,
75 VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
76}
77
78void qvirtio_set_driver_ok(QVirtioDevice *d)
79{
80 d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER_OK);
81 g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_DRIVER_OK |
82 VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
83}
84
85void qvirtio_wait_queue_isr(QVirtioDevice *d,
86 QVirtQueue *vq, gint64 timeout_us)
87{
88 gint64 start_time = g_get_monotonic_time();
89
90 for (;;) {
91 clock_step(100);
92 if (d->bus->get_queue_isr_status(d, vq)) {
93 return;
94 }
95 g_assert(g_get_monotonic_time() - start_time <= timeout_us);
96 }
97}
98
99
100
101
102
103
104uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
105 QVirtQueue *vq,
106 uint64_t addr,
107 gint64 timeout_us)
108{
109 gint64 start_time = g_get_monotonic_time();
110 uint8_t val;
111
112 while ((val = readb(addr)) == 0xff) {
113 clock_step(100);
114 g_assert(!d->bus->get_queue_isr_status(d, vq));
115 g_assert(g_get_monotonic_time() - start_time <= timeout_us);
116 }
117 return val;
118}
119
120
121
122
123
124
125
126
127
128
129void qvirtio_wait_used_elem(QVirtioDevice *d,
130 QVirtQueue *vq,
131 uint32_t desc_idx,
132 uint32_t *len,
133 gint64 timeout_us)
134{
135 gint64 start_time = g_get_monotonic_time();
136
137 for (;;) {
138 uint32_t got_desc_idx;
139
140 clock_step(100);
141
142 if (d->bus->get_queue_isr_status(d, vq) &&
143 qvirtqueue_get_buf(vq, &got_desc_idx, len)) {
144 g_assert_cmpint(got_desc_idx, ==, desc_idx);
145 return;
146 }
147
148 g_assert(g_get_monotonic_time() - start_time <= timeout_us);
149 }
150}
151
152void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us)
153{
154 gint64 start_time = g_get_monotonic_time();
155
156 for (;;) {
157 clock_step(100);
158 if (d->bus->get_config_isr_status(d)) {
159 return;
160 }
161 g_assert(g_get_monotonic_time() - start_time <= timeout_us);
162 }
163}
164
165void qvring_init(QTestState *qts, const QGuestAllocator *alloc, QVirtQueue *vq,
166 uint64_t addr)
167{
168 int i;
169
170 vq->desc = addr;
171 vq->avail = vq->desc + vq->size * sizeof(struct vring_desc);
172 vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size)
173 + vq->align - 1) & ~(vq->align - 1));
174
175 for (i = 0; i < vq->size - 1; i++) {
176
177 qtest_writeq(qts, vq->desc + (16 * i), 0);
178
179 qtest_writew(qts, vq->desc + (16 * i) + 14, i + 1);
180 }
181
182
183 qtest_writew(qts, vq->avail, 0);
184
185 qtest_writew(qts, vq->avail + 2, 0);
186
187 qtest_writew(qts, vq->avail + 4 + (2 * vq->size), 0);
188
189
190 qtest_writew(qts, vq->used, 0);
191
192 qtest_writew(qts, vq->used + 2 + sizeof(struct vring_used_elem) * vq->size,
193 0);
194}
195
196QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
197 QGuestAllocator *alloc, uint16_t elem)
198{
199 int i;
200 QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect));
201
202 indirect->index = 0;
203 indirect->elem = elem;
204 indirect->desc = guest_alloc(alloc, sizeof(struct vring_desc) * elem);
205
206 for (i = 0; i < elem - 1; ++i) {
207
208 writeq(indirect->desc + (16 * i), 0);
209
210 writew(indirect->desc + (16 * i) + 12, VRING_DESC_F_NEXT);
211
212 writew(indirect->desc + (16 * i) + 14, i + 1);
213 }
214
215 return indirect;
216}
217
218void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
219 uint32_t len, bool write)
220{
221 uint16_t flags;
222
223 g_assert_cmpint(indirect->index, <, indirect->elem);
224
225 flags = readw(indirect->desc + (16 * indirect->index) + 12);
226
227 if (write) {
228 flags |= VRING_DESC_F_WRITE;
229 }
230
231
232 writeq(indirect->desc + (16 * indirect->index), data);
233
234 writel(indirect->desc + (16 * indirect->index) + 8, len);
235
236 writew(indirect->desc + (16 * indirect->index) + 12, flags);
237
238 indirect->index++;
239}
240
241uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
242 bool next)
243{
244 uint16_t flags = 0;
245 vq->num_free--;
246
247 if (write) {
248 flags |= VRING_DESC_F_WRITE;
249 }
250
251 if (next) {
252 flags |= VRING_DESC_F_NEXT;
253 }
254
255
256 writeq(vq->desc + (16 * vq->free_head), data);
257
258 writel(vq->desc + (16 * vq->free_head) + 8, len);
259
260 writew(vq->desc + (16 * vq->free_head) + 12, flags);
261
262 return vq->free_head++;
263}
264
265uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect)
266{
267 g_assert(vq->indirect);
268 g_assert_cmpint(vq->size, >=, indirect->elem);
269 g_assert_cmpint(indirect->index, ==, indirect->elem);
270
271 vq->num_free--;
272
273
274 writeq(vq->desc + (16 * vq->free_head), indirect->desc);
275
276 writel(vq->desc + (16 * vq->free_head) + 8,
277 sizeof(struct vring_desc) * indirect->elem);
278
279 writew(vq->desc + (16 * vq->free_head) + 12, VRING_DESC_F_INDIRECT);
280
281 return vq->free_head++;
282}
283
284void qvirtqueue_kick(QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head)
285{
286
287 uint16_t idx = readw(vq->avail + 2);
288
289 uint16_t flags;
290
291 uint16_t avail_event;
292
293
294 writew(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
295
296 writew(vq->avail + 2, idx + 1);
297
298
299 flags = readw(vq->avail);
300 avail_event = readw(vq->used + 4 +
301 sizeof(struct vring_used_elem) * vq->size);
302
303
304 if ((flags & VRING_USED_F_NO_NOTIFY) == 0 &&
305 (!vq->event || (uint16_t)(idx-avail_event) < 1)) {
306 d->bus->virtqueue_kick(d, vq);
307 }
308}
309
310
311
312
313
314
315
316
317
318
319
320bool qvirtqueue_get_buf(QVirtQueue *vq, uint32_t *desc_idx, uint32_t *len)
321{
322 uint16_t idx;
323 uint64_t elem_addr;
324
325 idx = readw(vq->used + offsetof(struct vring_used, idx));
326 if (idx == vq->last_used_idx) {
327 return false;
328 }
329
330 elem_addr = vq->used +
331 offsetof(struct vring_used, ring) +
332 (vq->last_used_idx % vq->size) *
333 sizeof(struct vring_used_elem);
334
335 if (desc_idx) {
336 *desc_idx = readl(elem_addr + offsetof(struct vring_used_elem, id));
337 }
338
339 if (len) {
340 *len = readw(elem_addr + offsetof(struct vring_used_elem, len));
341 }
342
343 vq->last_used_idx++;
344 return true;
345}
346
347void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx)
348{
349 g_assert(vq->event);
350
351
352 writew(vq->avail + 4 + (2 * vq->size), idx);
353}
354
355void qvirtio_start_device(QVirtioDevice *vdev)
356{
357 qvirtio_reset(vdev);
358 qvirtio_set_acknowledge(vdev);
359 qvirtio_set_driver(vdev);
360}
361
362bool qvirtio_is_big_endian(QVirtioDevice *d)
363{
364 return d->big_endian;
365}
366