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qemu/tests/libqos/virtio.c

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/*
* libqos virtio driver
*
* Copyright (c) 2014 Marc Marí
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "libqtest.h"
#include "libqos/virtio.h"
#include "standard-headers/linux/virtio_config.h"
#include "standard-headers/linux/virtio_ring.h"
uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
{
return d->bus->config_readb(d, addr);
}
uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr)
{
return d->bus->config_readw(d, addr);
}
uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr)
{
return d->bus->config_readl(d, addr);
}
uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr)
{
return d->bus->config_readq(d, addr);
}
uint32_t qvirtio_get_features(QVirtioDevice *d)
{
return d->bus->get_features(d);
}
void qvirtio_set_features(QVirtioDevice *d, uint32_t features)
{
d->bus->set_features(d, features);
}
QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
QGuestAllocator *alloc, uint16_t index)
{
return d->bus->virtqueue_setup(d, alloc, index);
}
void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
QGuestAllocator *alloc)
{
return bus->virtqueue_cleanup(vq, alloc);
}
void qvirtio_reset(QVirtioDevice *d)
{
d->bus->set_status(d, 0);
g_assert_cmphex(d->bus->get_status(d), ==, 0);
}
void qvirtio_set_acknowledge(QVirtioDevice *d)
{
d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_ACKNOWLEDGE);
g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_ACKNOWLEDGE);
}
void qvirtio_set_driver(QVirtioDevice *d)
{
d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER);
g_assert_cmphex(d->bus->get_status(d), ==,
VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
}
void qvirtio_set_driver_ok(QVirtioDevice *d)
{
d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER_OK);
g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_DRIVER_OK |
VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
}
void qvirtio_wait_queue_isr(QVirtioDevice *d,
QVirtQueue *vq, gint64 timeout_us)
{
gint64 start_time = g_get_monotonic_time();
for (;;) {
clock_step(100);
if (d->bus->get_queue_isr_status(d, vq)) {
return;
}
g_assert(g_get_monotonic_time() - start_time <= timeout_us);
}
}
/* Wait for the status byte at given guest memory address to be set
*
* The virtqueue interrupt must not be raised, making this useful for testing
* event_index functionality.
*/
uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
QVirtQueue *vq,
uint64_t addr,
gint64 timeout_us)
{
gint64 start_time = g_get_monotonic_time();
uint8_t val;
while ((val = readb(addr)) == 0xff) {
clock_step(100);
g_assert(!d->bus->get_queue_isr_status(d, vq));
g_assert(g_get_monotonic_time() - start_time <= timeout_us);
}
return val;
}
void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us)
{
gint64 start_time = g_get_monotonic_time();
for (;;) {
clock_step(100);
if (d->bus->get_config_isr_status(d)) {
return;
}
g_assert(g_get_monotonic_time() - start_time <= timeout_us);
}
}
void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr)
{
int i;
vq->desc = addr;
vq->avail = vq->desc + vq->size * sizeof(struct vring_desc);
vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size)
+ vq->align - 1) & ~(vq->align - 1));
for (i = 0; i < vq->size - 1; i++) {
/* vq->desc[i].addr */
writeq(vq->desc + (16 * i), 0);
/* vq->desc[i].next */
writew(vq->desc + (16 * i) + 14, i + 1);
}
/* vq->avail->flags */
writew(vq->avail, 0);
/* vq->avail->idx */
writew(vq->avail + 2, 0);
/* vq->avail->used_event */
writew(vq->avail + 4 + (2 * vq->size), 0);
/* vq->used->flags */
writew(vq->used, 0);
/* vq->used->avail_event */
writew(vq->used + 2 + sizeof(struct vring_used_elem) * vq->size, 0);
}
QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
QGuestAllocator *alloc, uint16_t elem)
{
int i;
QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect));
indirect->index = 0;
indirect->elem = elem;
indirect->desc = guest_alloc(alloc, sizeof(struct vring_desc) * elem);
for (i = 0; i < elem - 1; ++i) {
/* indirect->desc[i].addr */
writeq(indirect->desc + (16 * i), 0);
/* indirect->desc[i].flags */
writew(indirect->desc + (16 * i) + 12, VRING_DESC_F_NEXT);
/* indirect->desc[i].next */
writew(indirect->desc + (16 * i) + 14, i + 1);
}
return indirect;
}
void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
uint32_t len, bool write)
{
uint16_t flags;
g_assert_cmpint(indirect->index, <, indirect->elem);
flags = readw(indirect->desc + (16 * indirect->index) + 12);
if (write) {
flags |= VRING_DESC_F_WRITE;
}
/* indirect->desc[indirect->index].addr */
writeq(indirect->desc + (16 * indirect->index), data);
/* indirect->desc[indirect->index].len */
writel(indirect->desc + (16 * indirect->index) + 8, len);
/* indirect->desc[indirect->index].flags */
writew(indirect->desc + (16 * indirect->index) + 12, flags);
indirect->index++;
}
uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
bool next)
{
uint16_t flags = 0;
vq->num_free--;
if (write) {
flags |= VRING_DESC_F_WRITE;
}
if (next) {
flags |= VRING_DESC_F_NEXT;
}
/* vq->desc[vq->free_head].addr */
writeq(vq->desc + (16 * vq->free_head), data);
/* vq->desc[vq->free_head].len */
writel(vq->desc + (16 * vq->free_head) + 8, len);
/* vq->desc[vq->free_head].flags */
writew(vq->desc + (16 * vq->free_head) + 12, flags);
return vq->free_head++; /* Return and increase, in this order */
}
uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect)
{
g_assert(vq->indirect);
g_assert_cmpint(vq->size, >=, indirect->elem);
g_assert_cmpint(indirect->index, ==, indirect->elem);
vq->num_free--;
/* vq->desc[vq->free_head].addr */
writeq(vq->desc + (16 * vq->free_head), indirect->desc);
/* vq->desc[vq->free_head].len */
writel(vq->desc + (16 * vq->free_head) + 8,
sizeof(struct vring_desc) * indirect->elem);
/* vq->desc[vq->free_head].flags */
writew(vq->desc + (16 * vq->free_head) + 12, VRING_DESC_F_INDIRECT);
return vq->free_head++; /* Return and increase, in this order */
}
void qvirtqueue_kick(QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head)
{
/* vq->avail->idx */
uint16_t idx = readw(vq->avail + 2);
/* vq->used->flags */
uint16_t flags;
/* vq->used->avail_event */
uint16_t avail_event;
/* vq->avail->ring[idx % vq->size] */
writew(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
/* vq->avail->idx */
writew(vq->avail + 2, idx + 1);
/* Must read after idx is updated */
flags = readw(vq->avail);
avail_event = readw(vq->used + 4 +
sizeof(struct vring_used_elem) * vq->size);
/* < 1 because we add elements to avail queue one by one */
if ((flags & VRING_USED_F_NO_NOTIFY) == 0 &&
(!vq->event || (uint16_t)(idx-avail_event) < 1)) {
d->bus->virtqueue_kick(d, vq);
}
}
void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx)
{
g_assert(vq->event);
/* vq->avail->used_event */
writew(vq->avail + 4 + (2 * vq->size), idx);
}
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