--- /dev/null
+/*
+ * 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 <glib.h>
+#include "libqtest.h"
+#include "libqos/virtio.h"
+
+uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
+ uint64_t addr)
+{
+ return bus->config_readb(d, addr);
+}
+
+uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
+ uint64_t addr)
+{
+ return bus->config_readw(d, addr);
+}
+
+uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
+ uint64_t addr)
+{
+ return bus->config_readl(d, addr);
+}
+
+uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
+ uint64_t addr)
+{
+ return bus->config_readq(d, addr);
+}
+
+uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d)
+{
+ return bus->get_features(d);
+}
+
+void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
+ uint32_t features)
+{
+ bus->set_features(d, features);
+}
+
+QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
+ QGuestAllocator *alloc, uint16_t index)
+{
+ return bus->virtqueue_setup(d, alloc, index);
+}
+
+void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d)
+{
+ bus->set_status(d, QVIRTIO_RESET);
+ g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_RESET);
+}
+
+void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d)
+{
+ bus->set_status(d, bus->get_status(d) | QVIRTIO_ACKNOWLEDGE);
+ g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_ACKNOWLEDGE);
+}
+
+void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d)
+{
+ bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER);
+ g_assert_cmphex(bus->get_status(d), ==,
+ QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
+}
+
+void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d)
+{
+ bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER_OK);
+ g_assert_cmphex(bus->get_status(d), ==,
+ QVIRTIO_DRIVER_OK | QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
+}
+
+void qvirtio_wait_queue_isr(const QVirtioBus *bus, QVirtioDevice *d,
+ QVirtQueue *vq, gint64 timeout_us)
+{
+ gint64 start_time = g_get_monotonic_time();
+
+ for (;;) {
+ clock_step(100);
+ if (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(const QVirtioBus *bus,
+ 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(!bus->get_queue_isr_status(d, vq));
+ g_assert(g_get_monotonic_time() - start_time <= timeout_us);
+ }
+ return val;
+}
+
+void qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
+ gint64 timeout_us)
+{
+ gint64 start_time = g_get_monotonic_time();
+
+ for (;;) {
+ clock_step(100);
+ if (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(QVRingDesc);
+ 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 */
+ writew(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 QVRingUsedElem)*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(QVRingDesc)*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, QVRING_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 |= QVRING_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 |= QVRING_DESC_F_WRITE;
+ }
+
+ if (next) {
+ flags |= QVRING_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(QVRingDesc) * indirect->elem);
+ /* vq->desc[vq->free_head].flags */
+ writew(vq->desc + (16 * vq->free_head) + 12, QVRING_DESC_F_INDIRECT);
+
+ return vq->free_head++; /* Return and increase, in this order */
+}
+
+void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
+ uint32_t free_head)
+{
+ /* vq->avail->idx */
+ uint16_t idx = readl(vq->avail + 2);
+ /* vq->used->flags */
+ uint16_t flags;
+ /* vq->used->avail_event */
+ uint16_t avail_event;
+
+ /* vq->avail->ring[idx % vq->size] */
+ writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
+ /* vq->avail->idx */
+ writel(vq->avail + 2, idx + 1);
+
+ /* Must read after idx is updated */
+ flags = readw(vq->avail);
+ avail_event = readw(vq->used + 4 +
+ (sizeof(struct QVRingUsedElem) * vq->size));
+
+ /* < 1 because we add elements to avail queue one by one */
+ if ((flags & QVRING_USED_F_NO_NOTIFY) == 0 &&
+ (!vq->event || (uint16_t)(idx-avail_event) < 1)) {
+ 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);
+}
Code Review / kvmfornfv.git / blobdiff