450 lines
14 KiB
C
450 lines
14 KiB
C
/*
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* libqos virtio driver
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*
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* Copyright (c) 2014 Marc Marí
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/bswap.h"
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#include "libqtest.h"
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#include "libqos/virtio.h"
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#include "standard-headers/linux/virtio_config.h"
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#include "standard-headers/linux/virtio_ring.h"
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/*
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* qtest_readX/writeX() functions transfer host endian from/to guest endian.
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* This works great for Legacy VIRTIO devices where we need guest endian
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* accesses. For VIRTIO 1.0 the vring is little-endian so the automatic guest
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* endianness conversion is not wanted.
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*
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* The following qvirtio_readX/writeX() functions handle Legacy and VIRTIO 1.0
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* accesses seamlessly.
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*/
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static uint16_t qvirtio_readw(QVirtioDevice *d, QTestState *qts, uint64_t addr)
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{
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uint16_t val = qtest_readw(qts, addr);
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if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
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val = bswap16(val);
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}
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return val;
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}
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static uint32_t qvirtio_readl(QVirtioDevice *d, QTestState *qts, uint64_t addr)
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{
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uint32_t val = qtest_readl(qts, addr);
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if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
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val = bswap32(val);
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}
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return val;
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}
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static void qvirtio_writew(QVirtioDevice *d, QTestState *qts,
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uint64_t addr, uint16_t val)
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{
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if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
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val = bswap16(val);
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}
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qtest_writew(qts, addr, val);
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}
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static void qvirtio_writel(QVirtioDevice *d, QTestState *qts,
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uint64_t addr, uint32_t val)
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{
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if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
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val = bswap32(val);
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}
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qtest_writel(qts, addr, val);
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}
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static void qvirtio_writeq(QVirtioDevice *d, QTestState *qts,
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uint64_t addr, uint64_t val)
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{
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if (d->features & (1ull << VIRTIO_F_VERSION_1) && qtest_big_endian(qts)) {
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val = bswap64(val);
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}
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qtest_writeq(qts, addr, val);
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}
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uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
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{
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g_assert_true(d->features_negotiated);
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return d->bus->config_readb(d, addr);
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}
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uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr)
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{
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g_assert_true(d->features_negotiated);
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return d->bus->config_readw(d, addr);
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}
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uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr)
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{
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g_assert_true(d->features_negotiated);
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return d->bus->config_readl(d, addr);
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}
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uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr)
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{
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g_assert_true(d->features_negotiated);
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return d->bus->config_readq(d, addr);
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}
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uint64_t qvirtio_get_features(QVirtioDevice *d)
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{
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return d->bus->get_features(d);
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}
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void qvirtio_set_features(QVirtioDevice *d, uint64_t features)
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{
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d->features = features;
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d->bus->set_features(d, features);
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/*
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* This could be a separate function for drivers that want to access
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* configuration space before setting FEATURES_OK, but no existing users
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* need that and it's less code for callers if this is done implicitly.
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*/
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if (features & (1ull << VIRTIO_F_VERSION_1)) {
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uint8_t status = d->bus->get_status(d) |
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VIRTIO_CONFIG_S_FEATURES_OK;
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d->bus->set_status(d, status);
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g_assert_cmphex(d->bus->get_status(d), ==, status);
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}
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d->features_negotiated = true;
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}
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QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
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QGuestAllocator *alloc, uint16_t index)
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{
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g_assert_true(d->features_negotiated);
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return d->bus->virtqueue_setup(d, alloc, index);
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}
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void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
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QGuestAllocator *alloc)
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{
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return bus->virtqueue_cleanup(vq, alloc);
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}
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void qvirtio_reset(QVirtioDevice *d)
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{
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d->bus->set_status(d, 0);
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g_assert_cmphex(d->bus->get_status(d), ==, 0);
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d->features_negotiated = false;
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}
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void qvirtio_set_acknowledge(QVirtioDevice *d)
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{
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d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_ACKNOWLEDGE);
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g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_ACKNOWLEDGE);
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}
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void qvirtio_set_driver(QVirtioDevice *d)
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{
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d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER);
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g_assert_cmphex(d->bus->get_status(d), ==,
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VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
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}
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void qvirtio_set_driver_ok(QVirtioDevice *d)
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{
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d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER_OK);
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g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_DRIVER_OK |
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VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE |
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(d->features & (1ull << VIRTIO_F_VERSION_1) ?
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VIRTIO_CONFIG_S_FEATURES_OK : 0));
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}
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void qvirtio_wait_queue_isr(QTestState *qts, QVirtioDevice *d,
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QVirtQueue *vq, gint64 timeout_us)
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{
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gint64 start_time = g_get_monotonic_time();
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for (;;) {
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qtest_clock_step(qts, 100);
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if (d->bus->get_queue_isr_status(d, vq)) {
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return;
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}
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g_assert(g_get_monotonic_time() - start_time <= timeout_us);
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}
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}
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/* Wait for the status byte at given guest memory address to be set
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*
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* The virtqueue interrupt must not be raised, making this useful for testing
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* event_index functionality.
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*/
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uint8_t qvirtio_wait_status_byte_no_isr(QTestState *qts, QVirtioDevice *d,
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QVirtQueue *vq,
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uint64_t addr,
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gint64 timeout_us)
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{
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gint64 start_time = g_get_monotonic_time();
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uint8_t val;
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while ((val = qtest_readb(qts, addr)) == 0xff) {
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qtest_clock_step(qts, 100);
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g_assert(!d->bus->get_queue_isr_status(d, vq));
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g_assert(g_get_monotonic_time() - start_time <= timeout_us);
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}
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return val;
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}
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/*
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* qvirtio_wait_used_elem:
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* @desc_idx: The next expected vq->desc[] index in the used ring
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* @len: A pointer that is filled with the length written into the buffer, may
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* be NULL
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* @timeout_us: How many microseconds to wait before failing
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*
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* This function waits for the next completed request on the used ring.
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*/
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void qvirtio_wait_used_elem(QTestState *qts, QVirtioDevice *d,
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QVirtQueue *vq,
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uint32_t desc_idx,
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uint32_t *len,
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gint64 timeout_us)
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{
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gint64 start_time = g_get_monotonic_time();
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for (;;) {
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uint32_t got_desc_idx;
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qtest_clock_step(qts, 100);
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if (d->bus->get_queue_isr_status(d, vq) &&
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qvirtqueue_get_buf(qts, vq, &got_desc_idx, len)) {
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g_assert_cmpint(got_desc_idx, ==, desc_idx);
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return;
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}
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g_assert(g_get_monotonic_time() - start_time <= timeout_us);
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}
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}
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void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us)
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{
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d->bus->wait_config_isr_status(d, timeout_us);
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}
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void qvring_init(QTestState *qts, const QGuestAllocator *alloc, QVirtQueue *vq,
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uint64_t addr)
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{
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int i;
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vq->desc = addr;
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vq->avail = vq->desc + vq->size * sizeof(struct vring_desc);
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vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size)
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+ vq->align - 1) & ~(vq->align - 1));
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for (i = 0; i < vq->size - 1; i++) {
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/* vq->desc[i].addr */
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qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * i), 0);
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/* vq->desc[i].next */
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qvirtio_writew(vq->vdev, qts, vq->desc + (16 * i) + 14, i + 1);
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}
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/* vq->avail->flags */
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qvirtio_writew(vq->vdev, qts, vq->avail, 0);
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/* vq->avail->idx */
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qvirtio_writew(vq->vdev, qts, vq->avail + 2, 0);
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/* vq->avail->used_event */
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qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), 0);
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/* vq->used->flags */
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qvirtio_writew(vq->vdev, qts, vq->used, 0);
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/* vq->used->avail_event */
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qvirtio_writew(vq->vdev, qts, vq->used + 2 +
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sizeof(struct vring_used_elem) * vq->size, 0);
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}
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QVRingIndirectDesc *qvring_indirect_desc_setup(QTestState *qs, QVirtioDevice *d,
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QGuestAllocator *alloc,
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uint16_t elem)
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{
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int i;
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QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect));
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indirect->index = 0;
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indirect->elem = elem;
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indirect->desc = guest_alloc(alloc, sizeof(struct vring_desc) * elem);
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for (i = 0; i < elem - 1; ++i) {
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/* indirect->desc[i].addr */
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qvirtio_writeq(d, qs, indirect->desc + (16 * i), 0);
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/* indirect->desc[i].flags */
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qvirtio_writew(d, qs, indirect->desc + (16 * i) + 12,
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VRING_DESC_F_NEXT);
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/* indirect->desc[i].next */
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qvirtio_writew(d, qs, indirect->desc + (16 * i) + 14, i + 1);
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}
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return indirect;
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}
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void qvring_indirect_desc_add(QVirtioDevice *d, QTestState *qts,
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QVRingIndirectDesc *indirect,
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uint64_t data, uint32_t len, bool write)
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{
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uint16_t flags;
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g_assert_cmpint(indirect->index, <, indirect->elem);
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flags = qvirtio_readw(d, qts, indirect->desc +
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(16 * indirect->index) + 12);
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if (write) {
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flags |= VRING_DESC_F_WRITE;
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}
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/* indirect->desc[indirect->index].addr */
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qvirtio_writeq(d, qts, indirect->desc + (16 * indirect->index), data);
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/* indirect->desc[indirect->index].len */
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qvirtio_writel(d, qts, indirect->desc + (16 * indirect->index) + 8, len);
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/* indirect->desc[indirect->index].flags */
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qvirtio_writew(d, qts, indirect->desc + (16 * indirect->index) + 12,
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flags);
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indirect->index++;
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}
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uint32_t qvirtqueue_add(QTestState *qts, QVirtQueue *vq, uint64_t data,
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uint32_t len, bool write, bool next)
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{
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uint16_t flags = 0;
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vq->num_free--;
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if (write) {
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flags |= VRING_DESC_F_WRITE;
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}
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if (next) {
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flags |= VRING_DESC_F_NEXT;
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}
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/* vq->desc[vq->free_head].addr */
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qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * vq->free_head), data);
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/* vq->desc[vq->free_head].len */
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qvirtio_writel(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 8, len);
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/* vq->desc[vq->free_head].flags */
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qvirtio_writew(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 12, flags);
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return vq->free_head++; /* Return and increase, in this order */
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}
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uint32_t qvirtqueue_add_indirect(QTestState *qts, QVirtQueue *vq,
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QVRingIndirectDesc *indirect)
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{
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g_assert(vq->indirect);
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g_assert_cmpint(vq->size, >=, indirect->elem);
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g_assert_cmpint(indirect->index, ==, indirect->elem);
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vq->num_free--;
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/* vq->desc[vq->free_head].addr */
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qvirtio_writeq(vq->vdev, qts, vq->desc + (16 * vq->free_head),
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indirect->desc);
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/* vq->desc[vq->free_head].len */
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qvirtio_writel(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 8,
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sizeof(struct vring_desc) * indirect->elem);
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/* vq->desc[vq->free_head].flags */
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qvirtio_writew(vq->vdev, qts, vq->desc + (16 * vq->free_head) + 12,
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VRING_DESC_F_INDIRECT);
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return vq->free_head++; /* Return and increase, in this order */
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}
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void qvirtqueue_kick(QTestState *qts, QVirtioDevice *d, QVirtQueue *vq,
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uint32_t free_head)
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{
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/* vq->avail->idx */
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uint16_t idx = qvirtio_readw(d, qts, vq->avail + 2);
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/* vq->used->flags */
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uint16_t flags;
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/* vq->used->avail_event */
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uint16_t avail_event;
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/* vq->avail->ring[idx % vq->size] */
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qvirtio_writew(d, qts, vq->avail + 4 + (2 * (idx % vq->size)), free_head);
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/* vq->avail->idx */
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qvirtio_writew(d, qts, vq->avail + 2, idx + 1);
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/* Must read after idx is updated */
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flags = qvirtio_readw(d, qts, vq->avail);
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avail_event = qvirtio_readw(d, qts, vq->used + 4 +
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sizeof(struct vring_used_elem) * vq->size);
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/* < 1 because we add elements to avail queue one by one */
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if ((flags & VRING_USED_F_NO_NOTIFY) == 0 &&
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(!vq->event || (uint16_t)(idx-avail_event) < 1)) {
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d->bus->virtqueue_kick(d, vq);
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}
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}
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/*
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* qvirtqueue_get_buf:
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* @desc_idx: A pointer that is filled with the vq->desc[] index, may be NULL
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* @len: A pointer that is filled with the length written into the buffer, may
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* be NULL
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*
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* This function gets the next used element if there is one ready.
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*
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* Returns: true if an element was ready, false otherwise
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*/
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bool qvirtqueue_get_buf(QTestState *qts, QVirtQueue *vq, uint32_t *desc_idx,
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uint32_t *len)
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{
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uint16_t idx;
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uint64_t elem_addr, addr;
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idx = qvirtio_readw(vq->vdev, qts,
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vq->used + offsetof(struct vring_used, idx));
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if (idx == vq->last_used_idx) {
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return false;
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}
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elem_addr = vq->used +
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offsetof(struct vring_used, ring) +
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(vq->last_used_idx % vq->size) *
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sizeof(struct vring_used_elem);
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if (desc_idx) {
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addr = elem_addr + offsetof(struct vring_used_elem, id);
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*desc_idx = qvirtio_readl(vq->vdev, qts, addr);
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}
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if (len) {
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addr = elem_addr + offsetof(struct vring_used_elem, len);
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*len = qvirtio_readw(vq->vdev, qts, addr);
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}
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vq->last_used_idx++;
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return true;
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}
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void qvirtqueue_set_used_event(QTestState *qts, QVirtQueue *vq, uint16_t idx)
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{
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g_assert(vq->event);
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/* vq->avail->used_event */
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qvirtio_writew(vq->vdev, qts, vq->avail + 4 + (2 * vq->size), idx);
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}
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void qvirtio_start_device(QVirtioDevice *vdev)
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{
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qvirtio_reset(vdev);
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qvirtio_set_acknowledge(vdev);
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qvirtio_set_driver(vdev);
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}
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bool qvirtio_is_big_endian(QVirtioDevice *d)
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{
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return d->big_endian;
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}
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