4 * Copyright (c) 2014 Marc MarĂ
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
10 #include "qemu/osdep.h"
13 #include "libqos/virtio.h"
15 uint8_t qvirtio_config_readb(const QVirtioBus
*bus
, QVirtioDevice
*d
,
18 return bus
->config_readb(d
, addr
);
21 uint16_t qvirtio_config_readw(const QVirtioBus
*bus
, QVirtioDevice
*d
,
24 return bus
->config_readw(d
, addr
);
27 uint32_t qvirtio_config_readl(const QVirtioBus
*bus
, QVirtioDevice
*d
,
30 return bus
->config_readl(d
, addr
);
33 uint64_t qvirtio_config_readq(const QVirtioBus
*bus
, QVirtioDevice
*d
,
36 return bus
->config_readq(d
, addr
);
39 uint32_t qvirtio_get_features(const QVirtioBus
*bus
, QVirtioDevice
*d
)
41 return bus
->get_features(d
);
44 void qvirtio_set_features(const QVirtioBus
*bus
, QVirtioDevice
*d
,
47 bus
->set_features(d
, features
);
50 QVirtQueue
*qvirtqueue_setup(const QVirtioBus
*bus
, QVirtioDevice
*d
,
51 QGuestAllocator
*alloc
, uint16_t index
)
53 return bus
->virtqueue_setup(d
, alloc
, index
);
56 void qvirtio_reset(const QVirtioBus
*bus
, QVirtioDevice
*d
)
58 bus
->set_status(d
, QVIRTIO_RESET
);
59 g_assert_cmphex(bus
->get_status(d
), ==, QVIRTIO_RESET
);
62 void qvirtio_set_acknowledge(const QVirtioBus
*bus
, QVirtioDevice
*d
)
64 bus
->set_status(d
, bus
->get_status(d
) | QVIRTIO_ACKNOWLEDGE
);
65 g_assert_cmphex(bus
->get_status(d
), ==, QVIRTIO_ACKNOWLEDGE
);
68 void qvirtio_set_driver(const QVirtioBus
*bus
, QVirtioDevice
*d
)
70 bus
->set_status(d
, bus
->get_status(d
) | QVIRTIO_DRIVER
);
71 g_assert_cmphex(bus
->get_status(d
), ==,
72 QVIRTIO_DRIVER
| QVIRTIO_ACKNOWLEDGE
);
75 void qvirtio_set_driver_ok(const QVirtioBus
*bus
, QVirtioDevice
*d
)
77 bus
->set_status(d
, bus
->get_status(d
) | QVIRTIO_DRIVER_OK
);
78 g_assert_cmphex(bus
->get_status(d
), ==,
79 QVIRTIO_DRIVER_OK
| QVIRTIO_DRIVER
| QVIRTIO_ACKNOWLEDGE
);
82 void qvirtio_wait_queue_isr(const QVirtioBus
*bus
, QVirtioDevice
*d
,
83 QVirtQueue
*vq
, gint64 timeout_us
)
85 gint64 start_time
= g_get_monotonic_time();
89 if (bus
->get_queue_isr_status(d
, vq
)) {
92 g_assert(g_get_monotonic_time() - start_time
<= timeout_us
);
96 /* Wait for the status byte at given guest memory address to be set
98 * The virtqueue interrupt must not be raised, making this useful for testing
99 * event_index functionality.
101 uint8_t qvirtio_wait_status_byte_no_isr(const QVirtioBus
*bus
,
107 gint64 start_time
= g_get_monotonic_time();
110 while ((val
= readb(addr
)) == 0xff) {
112 g_assert(!bus
->get_queue_isr_status(d
, vq
));
113 g_assert(g_get_monotonic_time() - start_time
<= timeout_us
);
118 void qvirtio_wait_config_isr(const QVirtioBus
*bus
, QVirtioDevice
*d
,
121 gint64 start_time
= g_get_monotonic_time();
125 if (bus
->get_config_isr_status(d
)) {
128 g_assert(g_get_monotonic_time() - start_time
<= timeout_us
);
132 void qvring_init(const QGuestAllocator
*alloc
, QVirtQueue
*vq
, uint64_t addr
)
137 vq
->avail
= vq
->desc
+ vq
->size
*sizeof(QVRingDesc
);
138 vq
->used
= (uint64_t)((vq
->avail
+ sizeof(uint16_t) * (3 + vq
->size
)
139 + vq
->align
- 1) & ~(vq
->align
- 1));
141 for (i
= 0; i
< vq
->size
- 1; i
++) {
142 /* vq->desc[i].addr */
143 writew(vq
->desc
+ (16 * i
), 0);
144 /* vq->desc[i].next */
145 writew(vq
->desc
+ (16 * i
) + 14, i
+ 1);
148 /* vq->avail->flags */
149 writew(vq
->avail
, 0);
151 writew(vq
->avail
+ 2, 0);
152 /* vq->avail->used_event */
153 writew(vq
->avail
+ 4 + (2 * vq
->size
), 0);
155 /* vq->used->flags */
157 /* vq->used->avail_event */
158 writew(vq
->used
+2+(sizeof(struct QVRingUsedElem
)*vq
->size
), 0);
161 QVRingIndirectDesc
*qvring_indirect_desc_setup(QVirtioDevice
*d
,
162 QGuestAllocator
*alloc
, uint16_t elem
)
165 QVRingIndirectDesc
*indirect
= g_malloc(sizeof(*indirect
));
168 indirect
->elem
= elem
;
169 indirect
->desc
= guest_alloc(alloc
, sizeof(QVRingDesc
)*elem
);
171 for (i
= 0; i
< elem
- 1; ++i
) {
172 /* indirect->desc[i].addr */
173 writeq(indirect
->desc
+ (16 * i
), 0);
174 /* indirect->desc[i].flags */
175 writew(indirect
->desc
+ (16 * i
) + 12, QVRING_DESC_F_NEXT
);
176 /* indirect->desc[i].next */
177 writew(indirect
->desc
+ (16 * i
) + 14, i
+ 1);
183 void qvring_indirect_desc_add(QVRingIndirectDesc
*indirect
, uint64_t data
,
184 uint32_t len
, bool write
)
188 g_assert_cmpint(indirect
->index
, <, indirect
->elem
);
190 flags
= readw(indirect
->desc
+ (16 * indirect
->index
) + 12);
193 flags
|= QVRING_DESC_F_WRITE
;
196 /* indirect->desc[indirect->index].addr */
197 writeq(indirect
->desc
+ (16 * indirect
->index
), data
);
198 /* indirect->desc[indirect->index].len */
199 writel(indirect
->desc
+ (16 * indirect
->index
) + 8, len
);
200 /* indirect->desc[indirect->index].flags */
201 writew(indirect
->desc
+ (16 * indirect
->index
) + 12, flags
);
206 uint32_t qvirtqueue_add(QVirtQueue
*vq
, uint64_t data
, uint32_t len
, bool write
,
213 flags
|= QVRING_DESC_F_WRITE
;
217 flags
|= QVRING_DESC_F_NEXT
;
220 /* vq->desc[vq->free_head].addr */
221 writeq(vq
->desc
+ (16 * vq
->free_head
), data
);
222 /* vq->desc[vq->free_head].len */
223 writel(vq
->desc
+ (16 * vq
->free_head
) + 8, len
);
224 /* vq->desc[vq->free_head].flags */
225 writew(vq
->desc
+ (16 * vq
->free_head
) + 12, flags
);
227 return vq
->free_head
++; /* Return and increase, in this order */
230 uint32_t qvirtqueue_add_indirect(QVirtQueue
*vq
, QVRingIndirectDesc
*indirect
)
232 g_assert(vq
->indirect
);
233 g_assert_cmpint(vq
->size
, >=, indirect
->elem
);
234 g_assert_cmpint(indirect
->index
, ==, indirect
->elem
);
238 /* vq->desc[vq->free_head].addr */
239 writeq(vq
->desc
+ (16 * vq
->free_head
), indirect
->desc
);
240 /* vq->desc[vq->free_head].len */
241 writel(vq
->desc
+ (16 * vq
->free_head
) + 8,
242 sizeof(QVRingDesc
) * indirect
->elem
);
243 /* vq->desc[vq->free_head].flags */
244 writew(vq
->desc
+ (16 * vq
->free_head
) + 12, QVRING_DESC_F_INDIRECT
);
246 return vq
->free_head
++; /* Return and increase, in this order */
249 void qvirtqueue_kick(const QVirtioBus
*bus
, QVirtioDevice
*d
, QVirtQueue
*vq
,
253 uint16_t idx
= readl(vq
->avail
+ 2);
254 /* vq->used->flags */
256 /* vq->used->avail_event */
257 uint16_t avail_event
;
259 /* vq->avail->ring[idx % vq->size] */
260 writel(vq
->avail
+ 4 + (2 * (idx
% vq
->size
)), free_head
);
262 writel(vq
->avail
+ 2, idx
+ 1);
264 /* Must read after idx is updated */
265 flags
= readw(vq
->avail
);
266 avail_event
= readw(vq
->used
+ 4 +
267 (sizeof(struct QVRingUsedElem
) * vq
->size
));
269 /* < 1 because we add elements to avail queue one by one */
270 if ((flags
& QVRING_USED_F_NO_NOTIFY
) == 0 &&
271 (!vq
->event
|| (uint16_t)(idx
-avail_event
) < 1)) {
272 bus
->virtqueue_kick(d
, vq
);
276 void qvirtqueue_set_used_event(QVirtQueue
*vq
, uint16_t idx
)
280 /* vq->avail->used_event */
281 writew(vq
->avail
+ 4 + (2 * vq
->size
), idx
);