blob: a21b6eee9cd637ef2ae0b49fe1402a7058fafdde [file] [log] [blame]
/*
* libqos virtio driver
*
* Copyright (c) 2014 Marc MarĂ­
*
* 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 "qemu/bswap.h"
#include "../libqtest.h"
#include "virtio.h"
#include "standard-headers/linux/virtio_config.h"
#include "standard-headers/linux/virtio_ring.h"
/*
* qtest_readX/writeX() functions transfer host endian from/to guest endian.
* This works great for Legacy VIRTIO devices where we need guest endian
* accesses. For VIRTIO 1.0 the vring is little-endian so the automatic guest
* endianness conversion is not wanted.
*
* The following qvirtio_readX/writeX() functions handle Legacy and VIRTIO 1.0
* accesses seamlessly.
*/
static uint16_t qvirtio_readw(QVirtioDevice *d, QTestState *qts, uint64_t addr)
{
uint16_t val = qtest_readw(qts, addr);
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap16(val);
}
return val;
}
static uint32_t qvirtio_readl(QVirtioDevice *d, QTestState *qts, uint64_t addr)
{
uint32_t val = qtest_readl(qts, addr);
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap32(val);
}
return val;
}
static void qvirtio_writew(QVirtioDevice *d, QTestState *qts,
uint64_t addr, uint16_t val)
{
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap16(val);
}
qtest_writew(qts, addr, val);
}
static void qvirtio_writel(QVirtioDevice *d, QTestState *qts,
uint64_t addr, uint32_t val)
{
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap32(val);
}
qtest_writel(qts, addr, val);
}
static void qvirtio_writeq(QVirtioDevice *d, QTestState *qts,
uint64_t addr, uint64_t val)
{
if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
val = bswap64(val);
}
qtest_writeq(qts, addr, val);
}
uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
{
g_assert_true(d->features_negotiated);
return d->bus->config_readb(d, addr);
}
uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr)
{
g_assert_true(d->features_negotiated);
return d->bus->config_readw(d, addr);
}
uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr)
{
g_assert_true(d->features_negotiated);
return d->bus->config_readl(d, addr);
}
uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr)
{
g_assert_true(d->features_negotiated);
return d->bus->config_readq(d, addr);
}
uint64_t qvirtio_get_features(QVirtioDevice *d)
{
return d->bus->get_features(d);
}
void qvirtio_set_features(QVirtioDevice *d, uint64_t features)
{
g_assert(!(features & QVIRTIO_F_BAD_FEATURE));
d->features = features;
d->bus->set_features(d, features);
/*
* This could be a separate function for drivers that want to access
* configuration space before setting FEATURES_OK, but no existing users
* need that and it's less code for callers if this is done implicitly.
*/
if (features & (1ull << VIRTIO_F_VERSION_1)) {
uint8_t status = d->bus->get_status(d) |
VIRTIO_CONFIG_S_FEATURES_OK;
d->bus->set_status(d, status);
g_assert_cmphex(d->bus->get_status(d), ==, status);
}
d->features_negotiated = true;
}
QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
QGuestAllocator *alloc, uint16_t index)
{
g_assert_true(d->features_negotiated);
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);
d->features_negotiated = false;
}
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 |
(d->features & (1ull << VIRTIO_F_VERSION_1) ?
VIRTIO_CONFIG_S_FEATURES_OK : 0));
}
void qvirtio_wait_queue_isr(QTestState *qts, QVirtioDevice *d,
QVirtQueue *vq, gint64 timeout_us)
{
gint64 start_time = g_get_monotonic_time();
for (;;) {
qtest_clock_step(qts, 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(QTestState *qts, QVirtioDevice *d,
QVirtQueue *vq,
uint64_t addr,
gint64 timeout_us)
{
gint64 start_time = g_get_monotonic_time();
uint8_t val;
while ((val = qtest_readb(qts, addr)) == 0xff) {
qtest_clock_step(qts, 100);
g_assert(!d->bus->get_queue_isr_status(d, vq));
g_assert(g_get_monotonic_time() - start_time <= timeout_us);
}
return val;
}
/*
* qvirtio_wait_used_elem:
* @desc_idx: The next expected vq->desc[] index in the used ring
* @len: A pointer that is filled with the length written into the buffer, may
* be NULL
* @timeout_us: How many microseconds to wait before failing
*
* This function waits for the next completed request on the used ring.
*/
void qvirtio_wait_used_elem(QTestState *qts, QVirtioDevice *d,
QVirtQueue *vq,
uint32_t desc_idx,
uint32_t *len,
gint64 timeout_us)
{
gint64 start_time = g_get_monotonic_time();
for (;;) {
uint32_t got_desc_idx;
qtest_clock_step(qts, 100);
if (d->bus->get_queue_isr_status(d, vq) &&
qvirtqueue_get_buf(qts, vq, &got_desc_idx, len)) {
g_assert_cmpint(got_desc_idx, ==, desc_idx);
return;
}
g_assert(g_get_monotonic_time() - start_time <= timeout_us);
}
}
void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us)
{
d->bus->wait_config_isr_status(d, timeout_us);
}
void qvring_init(QTestState *qts, 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 */
qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * i), 0);
/* vq->desc[i].next */
qvirtio_writew(vq->vdev, qts, vq->desc + (16 * i) + 14, i + 1);
}
/* vq->avail->flags */
qvirtio_writew(vq->vdev, qts, vq->avail, 0);
/* vq->avail->idx */
qvirtio_writew(vq->vdev, qts, vq->avail + 2, 0);
/* vq->avail->used_event */
qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), 0);
/* vq->used->flags */
qvirtio_writew(vq->vdev, qts, vq->used, 0);
/* vq->used->idx */
qvirtio_writew(vq->vdev, qts, vq->used + 2, 0);
/* vq->used->avail_event */
qvirtio_writew(vq->vdev, qts, vq->used + 4 +
sizeof(struct vring_used_elem) * vq->size, 0);
}
QVRingIndirectDesc *qvring_indirect_desc_setup(QTestState *qs, 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; ++i) {
/* indirect->desc[i].addr */
qvirtio_writeq(d, qs, indirect->desc + (16 * i), 0);
/*
* If it's not the last element of the ring, set
* the chain (VRING_DESC_F_NEXT) flag and
* desc->next. Clear the last element - there's
* no guarantee that guest_alloc() will do it.
*/
if (i != elem - 1) {
/* indirect->desc[i].flags */
qvirtio_writew(d, qs, indirect->desc + (16 * i) + 12,
VRING_DESC_F_NEXT);
/* indirect->desc[i].next */
qvirtio_writew(d, qs, indirect->desc + (16 * i) + 14, i + 1);
} else {
qvirtio_writew(d, qs, indirect->desc + (16 * i) + 12, 0);
qvirtio_writew(d, qs, indirect->desc + (16 * i) + 14, 0);
}
}
return indirect;
}
void qvring_indirect_desc_add(QVirtioDevice *d, QTestState *qts,
QVRingIndirectDesc *indirect,
uint64_t data, uint32_t len, bool write)
{
uint16_t flags;
g_assert_cmpint(indirect->index, <, indirect->elem);
flags = qvirtio_readw(d, qts, indirect->desc +
(16 * indirect->index) + 12);
if (write) {
flags |= VRING_DESC_F_WRITE;
}
/* indirect->desc[indirect->index].addr */
qvirtio_writeq(d, qts, indirect->desc + (16 * indirect->index), data);
/* indirect->desc[indirect->index].len */
qvirtio_writel(d, qts, indirect->desc + (16 * indirect->index) + 8, len);
/* indirect->desc[indirect->index].flags */
qvirtio_writew(d, qts, indirect->desc + (16 * indirect->index) + 12,
flags);
indirect->index++;
}
uint32_t qvirtqueue_add(QTestState *qts, 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 */
qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * vq->free_head), data);
/* vq->desc[vq->free_head].len */
qvirtio_writel(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 8, len);
/* vq->desc[vq->free_head].flags */
qvirtio_writew(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 12, flags);
return vq->free_head++; /* Return and increase, in this order */
}
uint32_t qvirtqueue_add_indirect(QTestState *qts, 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 */
qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * vq->free_head),
indirect->desc);
/* vq->desc[vq->free_head].len */
qvirtio_writel(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 8,
sizeof(struct vring_desc) * indirect->elem);
/* vq->desc[vq->free_head].flags */
qvirtio_writew(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 12,
VRING_DESC_F_INDIRECT);
return vq->free_head++; /* Return and increase, in this order */
}
void qvirtqueue_kick(QTestState *qts, QVirtioDevice *d, QVirtQueue *vq,
uint32_t free_head)
{
/* vq->avail->idx */
uint16_t idx = qvirtio_readw(d, qts, vq->avail + 2);
/* vq->used->flags */
uint16_t flags;
/* vq->used->avail_event */
uint16_t avail_event;
/* vq->avail->ring[idx % vq->size] */
qvirtio_writew(d, qts, vq->avail + 4 + (2 * (idx % vq->size)), free_head);
/* vq->avail->idx */
qvirtio_writew(d, qts, vq->avail + 2, idx + 1);
/* Must read after idx is updated */
flags = qvirtio_readw(d, qts, vq->used);
avail_event = qvirtio_readw(d, qts, 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);
}
}
/*
* qvirtqueue_get_buf:
* @desc_idx: A pointer that is filled with the vq->desc[] index, may be NULL
* @len: A pointer that is filled with the length written into the buffer, may
* be NULL
*
* This function gets the next used element if there is one ready.
*
* Returns: true if an element was ready, false otherwise
*/
bool qvirtqueue_get_buf(QTestState *qts, QVirtQueue *vq, uint32_t *desc_idx,
uint32_t *len)
{
uint16_t idx;
uint64_t elem_addr, addr;
idx = qvirtio_readw(vq->vdev, qts,
vq->used + offsetof(struct vring_used, idx));
if (idx == vq->last_used_idx) {
return false;
}
elem_addr = vq->used +
offsetof(struct vring_used, ring) +
(vq->last_used_idx % vq->size) *
sizeof(struct vring_used_elem);
if (desc_idx) {
addr = elem_addr + offsetof(struct vring_used_elem, id);
*desc_idx = qvirtio_readl(vq->vdev, qts, addr);
}
if (len) {
addr = elem_addr + offsetof(struct vring_used_elem, len);
*len = qvirtio_readw(vq->vdev, qts, addr);
}
vq->last_used_idx++;
return true;
}
void qvirtqueue_set_used_event(QTestState *qts, QVirtQueue *vq, uint16_t idx)
{
g_assert(vq->event);
/* vq->avail->used_event */
qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), idx);
}
void qvirtio_start_device(QVirtioDevice *vdev)
{
qvirtio_reset(vdev);
qvirtio_set_acknowledge(vdev);
qvirtio_set_driver(vdev);
}
bool qvirtio_is_big_endian(QVirtioDevice *d)
{
return d->big_endian;
}