LXR qemu/tests/libqos/virtio.c

   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 <glib.h>
  12#include "libqtest.h"
  13#include "libqos/virtio.h"
  14
  15uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
  16                                                                uint64_t addr)
  17{
  18    return bus->config_readb(d, addr);
  19}
  20
  21uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
  22                                                                uint64_t addr)
  23{
  24    return bus->config_readw(d, addr);
  25}
  26
  27uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
  28                                                                uint64_t addr)
  29{
  30    return bus->config_readl(d, addr);
  31}
  32
  33uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
  34                                                                uint64_t addr)
  35{
  36    return bus->config_readq(d, addr);
  37}
  38
  39uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d)
  40{
  41    return bus->get_features(d);
  42}
  43
  44void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
  45                                                            uint32_t features)
  46{
  47    bus->set_features(d, features);
  48}
  49
  50QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
  51                                        QGuestAllocator *alloc, uint16_t index)
  52{
  53    return bus->virtqueue_setup(d, alloc, index);
  54}
  55
  56void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d)
  57{
  58    bus->set_status(d, QVIRTIO_RESET);
  59    g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_RESET);
  60}
  61
  62void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d)
  63{
  64    bus->set_status(d, bus->get_status(d) | QVIRTIO_ACKNOWLEDGE);
  65    g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_ACKNOWLEDGE);
  66}
  67
  68void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d)
  69{
  70    bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER);
  71    g_assert_cmphex(bus->get_status(d), ==,
  72                                    QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
  73}
  74
  75void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d)
  76{
  77    bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER_OK);
  78    g_assert_cmphex(bus->get_status(d), ==,
  79                QVIRTIO_DRIVER_OK | QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
  80}
  81
  82void qvirtio_wait_queue_isr(const QVirtioBus *bus, QVirtioDevice *d,
  83                            QVirtQueue *vq, gint64 timeout_us)
  84{
  85    gint64 start_time = g_get_monotonic_time();
  86
  87    for (;;) {
  88        clock_step(100);
  89        if (bus->get_queue_isr_status(d, vq)) {
  90            return;
  91        }
  92        g_assert(g_get_monotonic_time() - start_time <= timeout_us);
  93    }
  94}
  95
  96/* Wait for the status byte at given guest memory address to be set
  97 *
  98 * The virtqueue interrupt must not be raised, making this useful for testing
  99 * event_index functionality.
 100 */
 101uint8_t qvirtio_wait_status_byte_no_isr(const QVirtioBus *bus,
 102                                        QVirtioDevice *d,
 103                                        QVirtQueue *vq,
 104                                        uint64_t addr,
 105                                        gint64 timeout_us)
 106{
 107    gint64 start_time = g_get_monotonic_time();
 108    uint8_t val;
 109
 110    while ((val = readb(addr)) == 0xff) {
 111        clock_step(100);
 112        g_assert(!bus->get_queue_isr_status(d, vq));
 113        g_assert(g_get_monotonic_time() - start_time <= timeout_us);
 114    }
 115    return val;
 116}
 117
 118void qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
 119                             gint64 timeout_us)
 120{
 121    gint64 start_time = g_get_monotonic_time();
 122
 123    for (;;) {
 124        clock_step(100);
 125        if (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(QVRingDesc);
 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        writew(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 QVRingUsedElem)*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(QVRingDesc)*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, QVRING_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 |= QVRING_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 |= QVRING_DESC_F_WRITE;
 214    }
 215
 216    if (next) {
 217        flags |= QVRING_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(QVRingDesc) * indirect->elem);
 243    /* vq->desc[vq->free_head].flags */
 244    writew(vq->desc + (16 * vq->free_head) + 12, QVRING_DESC_F_INDIRECT);
 245
 246    return vq->free_head++; /* Return and increase, in this order */
 247}
 248
 249void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
 250                                                            uint32_t free_head)
 251{
 252    /* vq->avail->idx */
 253    uint16_t idx = readl(vq->avail + 2);
 254    /* vq->used->flags */
 255    uint16_t flags;
 256    /* vq->used->avail_event */
 257    uint16_t avail_event;
 258
 259    /* vq->avail->ring[idx % vq->size] */
 260    writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
 261    /* vq->avail->idx */
 262    writel(vq->avail + 2, idx + 1);
 263
 264    /* Must read after idx is updated */
 265    flags = readw(vq->avail);
 266    avail_event = readw(vq->used + 4 +
 267                                (sizeof(struct QVRingUsedElem) * vq->size));
 268
 269    /* < 1 because we add elements to avail queue one by one */
 270    if ((flags & QVRING_USED_F_NO_NOTIFY) == 0 &&
 271                            (!vq->event || (uint16_t)(idx-avail_event) < 1)) {
 272        bus->virtqueue_kick(d, vq);
 273    }
 274}
 275
 276void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx)
 277{
 278    g_assert(vq->event);
 279
 280    /* vq->avail->used_event */
 281    writew(vq->avail + 4 + (2 * vq->size), idx);
 282}
 283