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);