282 lines
8.4 KiB
C
282 lines
8.4 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 <glib.h>
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#include "libqtest.h"
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#include "libqos/virtio.h"
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uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
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uint64_t addr)
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{
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return bus->config_readb(d, addr);
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}
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uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
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uint64_t addr)
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{
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return bus->config_readw(d, addr);
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}
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uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
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uint64_t addr)
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{
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return bus->config_readl(d, addr);
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}
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uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
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uint64_t addr)
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{
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return bus->config_readq(d, addr);
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}
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uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d)
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{
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return bus->get_features(d);
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}
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void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
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uint32_t features)
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{
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bus->set_features(d, features);
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}
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QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
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QGuestAllocator *alloc, uint16_t index)
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{
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return bus->virtqueue_setup(d, alloc, index);
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}
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void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d)
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{
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bus->set_status(d, QVIRTIO_RESET);
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g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_RESET);
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}
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void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d)
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{
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bus->set_status(d, bus->get_status(d) | QVIRTIO_ACKNOWLEDGE);
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g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_ACKNOWLEDGE);
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}
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void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d)
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{
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bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER);
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g_assert_cmphex(bus->get_status(d), ==,
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QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
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}
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void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d)
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{
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bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER_OK);
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g_assert_cmphex(bus->get_status(d), ==,
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QVIRTIO_DRIVER_OK | QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
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}
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void qvirtio_wait_queue_isr(const QVirtioBus *bus, 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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clock_step(100);
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if (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(const QVirtioBus *bus,
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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 = readb(addr)) == 0xff) {
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clock_step(100);
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g_assert(!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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void qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
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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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clock_step(100);
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if (bus->get_config_isr_status(d)) {
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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 qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, 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(QVRingDesc);
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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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writew(vq->desc + (16 * i), 0);
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/* vq->desc[i].next */
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writew(vq->desc + (16 * i) + 14, i + 1);
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}
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/* vq->avail->flags */
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writew(vq->avail, 0);
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/* vq->avail->idx */
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writew(vq->avail + 2, 0);
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/* vq->avail->used_event */
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writew(vq->avail + 4 + (2 * vq->size), 0);
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/* vq->used->flags */
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writew(vq->used, 0);
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/* vq->used->avail_event */
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writew(vq->used+2+(sizeof(struct QVRingUsedElem)*vq->size), 0);
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}
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QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
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QGuestAllocator *alloc, 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(QVRingDesc)*elem);
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for (i = 0; i < elem - 1; ++i) {
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/* indirect->desc[i].addr */
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writeq(indirect->desc + (16 * i), 0);
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/* indirect->desc[i].flags */
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writew(indirect->desc + (16 * i) + 12, QVRING_DESC_F_NEXT);
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/* indirect->desc[i].next */
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writew(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(QVRingIndirectDesc *indirect, uint64_t data,
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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 = readw(indirect->desc + (16 * indirect->index) + 12);
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if (write) {
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flags |= QVRING_DESC_F_WRITE;
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}
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/* indirect->desc[indirect->index].addr */
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writeq(indirect->desc + (16 * indirect->index), data);
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/* indirect->desc[indirect->index].len */
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writel(indirect->desc + (16 * indirect->index) + 8, len);
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/* indirect->desc[indirect->index].flags */
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writew(indirect->desc + (16 * indirect->index) + 12, flags);
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indirect->index++;
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}
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uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
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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 |= QVRING_DESC_F_WRITE;
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}
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if (next) {
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flags |= QVRING_DESC_F_NEXT;
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}
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/* vq->desc[vq->free_head].addr */
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writeq(vq->desc + (16 * vq->free_head), data);
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/* vq->desc[vq->free_head].len */
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writel(vq->desc + (16 * vq->free_head) + 8, len);
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/* vq->desc[vq->free_head].flags */
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writew(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(QVirtQueue *vq, 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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writeq(vq->desc + (16 * vq->free_head), indirect->desc);
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/* vq->desc[vq->free_head].len */
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writel(vq->desc + (16 * vq->free_head) + 8,
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sizeof(QVRingDesc) * indirect->elem);
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/* vq->desc[vq->free_head].flags */
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writew(vq->desc + (16 * vq->free_head) + 12, QVRING_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(const QVirtioBus *bus, 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 = readl(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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writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
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/* vq->avail->idx */
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writel(vq->avail + 2, idx + 1);
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/* Must read after idx is updated */
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flags = readw(vq->avail);
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avail_event = readw(vq->used + 4 +
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(sizeof(struct QVRingUsedElem) * vq->size));
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/* < 1 because we add elements to avail queue one by one */
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if ((flags & QVRING_USED_F_NO_NOTIFY) == 0 &&
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(!vq->event || (uint16_t)(idx-avail_event) < 1)) {
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bus->virtqueue_kick(d, vq);
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}
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}
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void qvirtqueue_set_used_event(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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writew(vq->avail + 4 + (2 * vq->size), idx);
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}
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