qemu/tests/libqos/virtio.c
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   1/*
   2 * libqos virtio driver
   3 *
   4 * Copyright (c) 2014 Marc Marí
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7 * See the COPYING file in the top-level directory.
   8 */
   9
  10#include "qemu/osdep.h"
  11#include "libqtest.h"
  12#include "libqos/virtio.h"
  13#include "standard-headers/linux/virtio_config.h"
  14#include "standard-headers/linux/virtio_ring.h"
  15
  16uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
  17{
  18    return d->bus->config_readb(d, addr);
  19}
  20
  21uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr)
  22{
  23    return d->bus->config_readw(d, addr);
  24}
  25
  26uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr)
  27{
  28    return d->bus->config_readl(d, addr);
  29}
  30
  31uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr)
  32{
  33    return d->bus->config_readq(d, addr);
  34}
  35
  36uint32_t qvirtio_get_features(QVirtioDevice *d)
  37{
  38    return d->bus->get_features(d);
  39}
  40
  41void qvirtio_set_features(QVirtioDevice *d, uint32_t features)
  42{
  43    d->bus->set_features(d, features);
  44}
  45
  46QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
  47                             QGuestAllocator *alloc, uint16_t index)
  48{
  49    return d->bus->virtqueue_setup(d, alloc, index);
  50}
  51
  52void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
  53                        QGuestAllocator *alloc)
  54{
  55    return bus->virtqueue_cleanup(vq, alloc);
  56}
  57
  58void qvirtio_reset(QVirtioDevice *d)
  59{
  60    d->bus->set_status(d, 0);
  61    g_assert_cmphex(d->bus->get_status(d), ==, 0);
  62}
  63
  64void qvirtio_set_acknowledge(QVirtioDevice *d)
  65{
  66    d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_ACKNOWLEDGE);
  67    g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_ACKNOWLEDGE);
  68}
  69
  70void qvirtio_set_driver(QVirtioDevice *d)
  71{
  72    d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER);
  73    g_assert_cmphex(d->bus->get_status(d), ==,
  74                    VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
  75}
  76
  77void qvirtio_set_driver_ok(QVirtioDevice *d)
  78{
  79    d->bus->set_status(d, d->bus->get_status(d) | VIRTIO_CONFIG_S_DRIVER_OK);
  80    g_assert_cmphex(d->bus->get_status(d), ==, VIRTIO_CONFIG_S_DRIVER_OK |
  81                    VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_ACKNOWLEDGE);
  82}
  83
  84void qvirtio_wait_queue_isr(QVirtioDevice *d,
  85                            QVirtQueue *vq, gint64 timeout_us)
  86{
  87    gint64 start_time = g_get_monotonic_time();
  88
  89    for (;;) {
  90        clock_step(100);
  91        if (d->bus->get_queue_isr_status(d, vq)) {
  92            return;
  93        }
  94        g_assert(g_get_monotonic_time() - start_time <= timeout_us);
  95    }
  96}
  97
  98/* Wait for the status byte at given guest memory address to be set
  99 *
 100 * The virtqueue interrupt must not be raised, making this useful for testing
 101 * event_index functionality.
 102 */
 103uint8_t qvirtio_wait_status_byte_no_isr(QVirtioDevice *d,
 104                                        QVirtQueue *vq,
 105                                        uint64_t addr,
 106                                        gint64 timeout_us)
 107{
 108    gint64 start_time = g_get_monotonic_time();
 109    uint8_t val;
 110
 111    while ((val = readb(addr)) == 0xff) {
 112        clock_step(100);
 113        g_assert(!d->bus->get_queue_isr_status(d, vq));
 114        g_assert(g_get_monotonic_time() - start_time <= timeout_us);
 115    }
 116    return val;
 117}
 118
 119void qvirtio_wait_config_isr(QVirtioDevice *d, gint64 timeout_us)
 120{
 121    gint64 start_time = g_get_monotonic_time();
 122
 123    for (;;) {
 124        clock_step(100);
 125        if (d->bus->get_config_isr_status(d)) {
 126            return;
 127        }
 128        g_assert(g_get_monotonic_time() - start_time <= timeout_us);
 129    }
 130}
 131
 132void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr)
 133{
 134    int i;
 135
 136    vq->desc = addr;
 137    vq->avail = vq->desc + vq->size * sizeof(struct vring_desc);
 138    vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size)
 139        + vq->align - 1) & ~(vq->align - 1));
 140
 141    for (i = 0; i < vq->size - 1; i++) {
 142        /* vq->desc[i].addr */
 143        writeq(vq->desc + (16 * i), 0);
 144        /* vq->desc[i].next */
 145        writew(vq->desc + (16 * i) + 14, i + 1);
 146    }
 147
 148    /* vq->avail->flags */
 149    writew(vq->avail, 0);
 150    /* vq->avail->idx */
 151    writew(vq->avail + 2, 0);
 152    /* vq->avail->used_event */
 153    writew(vq->avail + 4 + (2 * vq->size), 0);
 154
 155    /* vq->used->flags */
 156    writew(vq->used, 0);
 157    /* vq->used->avail_event */
 158    writew(vq->used + 2 + sizeof(struct vring_used_elem) * vq->size, 0);
 159}
 160
 161QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
 162                                        QGuestAllocator *alloc, uint16_t elem)
 163{
 164    int i;
 165    QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect));
 166
 167    indirect->index = 0;
 168    indirect->elem = elem;
 169    indirect->desc = guest_alloc(alloc, sizeof(struct vring_desc) * elem);
 170
 171    for (i = 0; i < elem - 1; ++i) {
 172        /* indirect->desc[i].addr */
 173        writeq(indirect->desc + (16 * i), 0);
 174        /* indirect->desc[i].flags */
 175        writew(indirect->desc + (16 * i) + 12, VRING_DESC_F_NEXT);
 176        /* indirect->desc[i].next */
 177        writew(indirect->desc + (16 * i) + 14, i + 1);
 178    }
 179
 180    return indirect;
 181}
 182
 183void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
 184                                                    uint32_t len, bool write)
 185{
 186    uint16_t flags;
 187
 188    g_assert_cmpint(indirect->index, <, indirect->elem);
 189
 190    flags = readw(indirect->desc + (16 * indirect->index) + 12);
 191
 192    if (write) {
 193        flags |= VRING_DESC_F_WRITE;
 194    }
 195
 196    /* indirect->desc[indirect->index].addr */
 197    writeq(indirect->desc + (16 * indirect->index), data);
 198    /* indirect->desc[indirect->index].len */
 199    writel(indirect->desc + (16 * indirect->index) + 8, len);
 200    /* indirect->desc[indirect->index].flags */
 201    writew(indirect->desc + (16 * indirect->index) + 12, flags);
 202
 203    indirect->index++;
 204}
 205
 206uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
 207                                                                    bool next)
 208{
 209    uint16_t flags = 0;
 210    vq->num_free--;
 211
 212    if (write) {
 213        flags |= VRING_DESC_F_WRITE;
 214    }
 215
 216    if (next) {
 217        flags |= VRING_DESC_F_NEXT;
 218    }
 219
 220    /* vq->desc[vq->free_head].addr */
 221    writeq(vq->desc + (16 * vq->free_head), data);
 222    /* vq->desc[vq->free_head].len */
 223    writel(vq->desc + (16 * vq->free_head) + 8, len);
 224    /* vq->desc[vq->free_head].flags */
 225    writew(vq->desc + (16 * vq->free_head) + 12, flags);
 226
 227    return vq->free_head++; /* Return and increase, in this order */
 228}
 229
 230uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect)
 231{
 232    g_assert(vq->indirect);
 233    g_assert_cmpint(vq->size, >=, indirect->elem);
 234    g_assert_cmpint(indirect->index, ==, indirect->elem);
 235
 236    vq->num_free--;
 237
 238    /* vq->desc[vq->free_head].addr */
 239    writeq(vq->desc + (16 * vq->free_head), indirect->desc);
 240    /* vq->desc[vq->free_head].len */
 241    writel(vq->desc + (16 * vq->free_head) + 8,
 242           sizeof(struct vring_desc) * indirect->elem);
 243    /* vq->desc[vq->free_head].flags */
 244    writew(vq->desc + (16 * vq->free_head) + 12, VRING_DESC_F_INDIRECT);
 245
 246    return vq->free_head++; /* Return and increase, in this order */
 247}
 248
 249void qvirtqueue_kick(QVirtioDevice *d, QVirtQueue *vq, uint32_t free_head)
 250{
 251    /* vq->avail->idx */
 252    uint16_t idx = readw(vq->avail + 2);
 253    /* vq->used->flags */
 254    uint16_t flags;
 255    /* vq->used->avail_event */
 256    uint16_t avail_event;
 257
 258    /* vq->avail->ring[idx % vq->size] */
 259    writew(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
 260    /* vq->avail->idx */
 261    writew(vq->avail + 2, idx + 1);
 262
 263    /* Must read after idx is updated */
 264    flags = readw(vq->avail);
 265    avail_event = readw(vq->used + 4 +
 266                                sizeof(struct vring_used_elem) * vq->size);
 267
 268    /* < 1 because we add elements to avail queue one by one */
 269    if ((flags & VRING_USED_F_NO_NOTIFY) == 0 &&
 270                            (!vq->event || (uint16_t)(idx-avail_event) < 1)) {
 271        d->bus->virtqueue_kick(d, vq);
 272    }
 273}
 274
 275void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx)
 276{
 277    g_assert(vq->event);
 278
 279    /* vq->avail->used_event */
 280    writew(vq->avail + 4 + (2 * vq->size), idx);
 281}
 282
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