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 "libqtest.h"
  12 #include "libqos/virtio.h"
  13 #include "standard-headers/linux/virtio_config.h"
  14 #include "standard-headers/linux/virtio_ring.h"
  15
  16 uint8_t qvirtio_config_readb(QVirtioDevice *d, uint64_t addr)
  17 {
  18     return d->bus->config_readb(d, addr);
  19 }
  20
  21 uint16_t qvirtio_config_readw(QVirtioDevice *d, uint64_t addr)
  22 {
  23     return d->bus->config_readw(d, addr);
  24 }
  25
  26 uint32_t qvirtio_config_readl(QVirtioDevice *d, uint64_t addr)
  27 {
  28     return d->bus->config_readl(d, addr);
  29 }
  30
  31 uint64_t qvirtio_config_readq(QVirtioDevice *d, uint64_t addr)
  32 {
  33     return d->bus->config_readq(d, addr);
  34 }
  35
  36 uint32_t qvirtio_get_features(QVirtioDevice *d)
  37 {
  38     return d->bus->get_features(d);
  39 }
  40
  41 void qvirtio_set_features(QVirtioDevice *d, uint32_t features)
  42 {
  43     d->bus->set_features(d, features);
  44 }
  45
  46 QVirtQueue *qvirtqueue_setup(QVirtioDevice *d,
  47                              QGuestAllocator *alloc, uint16_t index)
  48 {
  49     return d->bus->virtqueue_setup(d, alloc, index);
  50 }
  51
  52 void qvirtqueue_cleanup(const QVirtioBus *bus, QVirtQueue *vq,
  53                         QGuestAllocator *alloc)
  54 {
  55     return bus->virtqueue_cleanup(vq, alloc);
  56 }
  57
  58 void qvirtio_reset(QVirtioDevice *d)
  59 {
  60     d->bus->set_status(d, 0);
  61     g_assert_cmphex(d->bus->get_status(d), ==, 0);
  62 }
  63
  64 void 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
  70 void 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
  77 void 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
  84 void 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  */
 103 uint8_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
 119 void 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
 132 void 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
 161 QVRingIndirectDesc *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
 183 void 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
 206 uint32_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
 230 uint32_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
 249 void 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
 275 void 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 }