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 <glib.h>
  11 #include "libqtest.h"
  12 #include "libqos/virtio.h"
  13
  14 uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
  15                                                                 void *addr)
  16 {
  17     return bus->config_readb(d, addr);
  18 }
  19
  20 uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
  21                                                                 void *addr)
  22 {
  23     return bus->config_readw(d, addr);
  24 }
  25
  26 uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
  27                                                                 void *addr)
  28 {
  29     return bus->config_readl(d, addr);
  30 }
  31
  32 uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
  33                                                                 void *addr)
  34 {
  35     return bus->config_readq(d, addr);
  36 }
  37
  38 uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d)
  39 {
  40     return bus->get_features(d);
  41 }
  42
  43 void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
  44                                                             uint32_t features)
  45 {
  46     bus->set_features(d, features);
  47 }
  48
  49 QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
  50                                         QGuestAllocator *alloc, uint16_t index)
  51 {
  52     return bus->virtqueue_setup(d, alloc, index);
  53 }
  54
  55 void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d)
  56 {
  57     bus->set_status(d, QVIRTIO_RESET);
  58     g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_RESET);
  59 }
  60
  61 void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d)
  62 {
  63     bus->set_status(d, bus->get_status(d) | QVIRTIO_ACKNOWLEDGE);
  64     g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_ACKNOWLEDGE);
  65 }
  66
  67 void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d)
  68 {
  69     bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER);
  70     g_assert_cmphex(bus->get_status(d), ==,
  71                                     QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
  72 }
  73
  74 void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d)
  75 {
  76     bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER_OK);
  77     g_assert_cmphex(bus->get_status(d), ==,
  78                 QVIRTIO_DRIVER_OK | QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE);
  79 }
  80
  81 bool qvirtio_wait_queue_isr(const QVirtioBus *bus, QVirtioDevice *d,
  82                                             QVirtQueue *vq, uint64_t timeout)
  83 {
  84     do {
  85         clock_step(100);
  86         if (bus->get_queue_isr_status(d, vq)) {
  87             break; /* It has ended */
  88         }
  89     } while (--timeout);
  90
  91     return timeout != 0;
  92 }
  93
  94 bool qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
  95                                                             uint64_t timeout)
  96 {
  97     do {
  98         clock_step(100);
  99         if (bus->get_config_isr_status(d)) {
 100             break; /* It has ended */
 101         }
 102     } while (--timeout);
 103
 104     return timeout != 0;
 105 }
 106
 107 void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr)
 108 {
 109     int i;
 110
 111     vq->desc = addr;
 112     vq->avail = vq->desc + vq->size*sizeof(QVRingDesc);
 113     vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size)
 114         + vq->align - 1) & ~(vq->align - 1));
 115
 116     for (i = 0; i < vq->size - 1; i++) {
 117         /* vq->desc[i].addr */
 118         writew(vq->desc + (16 * i), 0);
 119         /* vq->desc[i].next */
 120         writew(vq->desc + (16 * i) + 14, i + 1);
 121     }
 122
 123     /* vq->avail->flags */
 124     writew(vq->avail, 0);
 125     /* vq->avail->idx */
 126     writew(vq->avail + 2, 0);
 127     /* vq->avail->used_event */
 128     writew(vq->avail + 4 + (2 * vq->size), 0);
 129
 130     /* vq->used->flags */
 131     writew(vq->used, 0);
 132     /* vq->used->avail_event */
 133     writew(vq->used+2+(sizeof(struct QVRingUsedElem)*vq->size), 0);
 134 }
 135
 136 QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
 137                                         QGuestAllocator *alloc, uint16_t elem)
 138 {
 139     int i;
 140     QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect));
 141
 142     indirect->index = 0;
 143     indirect->elem = elem;
 144     indirect->desc = guest_alloc(alloc, sizeof(QVRingDesc)*elem);
 145
 146     for (i = 0; i < elem - 1; ++i) {
 147         /* indirect->desc[i].addr */
 148         writeq(indirect->desc + (16 * i), 0);
 149         /* indirect->desc[i].flags */
 150         writew(indirect->desc + (16 * i) + 12, QVRING_DESC_F_NEXT);
 151         /* indirect->desc[i].next */
 152         writew(indirect->desc + (16 * i) + 14, i + 1);
 153     }
 154
 155     return indirect;
 156 }
 157
 158 void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
 159                                                     uint32_t len, bool write)
 160 {
 161     uint16_t flags;
 162
 163     g_assert_cmpint(indirect->index, <, indirect->elem);
 164
 165     flags = readw(indirect->desc + (16 * indirect->index) + 12);
 166
 167     if (write) {
 168         flags |= QVRING_DESC_F_WRITE;
 169     }
 170
 171     /* indirect->desc[indirect->index].addr */
 172     writeq(indirect->desc + (16 * indirect->index), data);
 173     /* indirect->desc[indirect->index].len */
 174     writel(indirect->desc + (16 * indirect->index) + 8, len);
 175     /* indirect->desc[indirect->index].flags */
 176     writew(indirect->desc + (16 * indirect->index) + 12, flags);
 177
 178     indirect->index++;
 179 }
 180
 181 uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
 182                                                                     bool next)
 183 {
 184     uint16_t flags = 0;
 185     vq->num_free--;
 186
 187     if (write) {
 188         flags |= QVRING_DESC_F_WRITE;
 189     }
 190
 191     if (next) {
 192         flags |= QVRING_DESC_F_NEXT;
 193     }
 194
 195     /* vq->desc[vq->free_head].addr */
 196     writeq(vq->desc + (16 * vq->free_head), data);
 197     /* vq->desc[vq->free_head].len */
 198     writel(vq->desc + (16 * vq->free_head) + 8, len);
 199     /* vq->desc[vq->free_head].flags */
 200     writew(vq->desc + (16 * vq->free_head) + 12, flags);
 201
 202     return vq->free_head++; /* Return and increase, in this order */
 203 }
 204
 205 uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect)
 206 {
 207     g_assert(vq->indirect);
 208     g_assert_cmpint(vq->size, >=, indirect->elem);
 209     g_assert_cmpint(indirect->index, ==, indirect->elem);
 210
 211     vq->num_free--;
 212
 213     /* vq->desc[vq->free_head].addr */
 214     writeq(vq->desc + (16 * vq->free_head), indirect->desc);
 215     /* vq->desc[vq->free_head].len */
 216     writel(vq->desc + (16 * vq->free_head) + 8,
 217                                         sizeof(QVRingDesc) * indirect->elem);
 218     /* vq->desc[vq->free_head].flags */
 219     writew(vq->desc + (16 * vq->free_head) + 12, QVRING_DESC_F_INDIRECT);
 220
 221     return vq->free_head++; /* Return and increase, in this order */
 222 }
 223
 224 void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
 225                                                             uint32_t free_head)
 226 {
 227     /* vq->avail->idx */
 228     uint16_t idx = readl(vq->avail + 2);
 229     /* vq->used->flags */
 230     uint16_t flags;
 231     /* vq->used->avail_event */
 232     uint16_t avail_event;
 233
 234     /* vq->avail->ring[idx % vq->size] */
 235     writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
 236     /* vq->avail->idx */
 237     writel(vq->avail + 2, idx + 1);
 238
 239     /* Must read after idx is updated */
 240     flags = readw(vq->avail);
 241     avail_event = readw(vq->used + 4 +
 242                                 (sizeof(struct QVRingUsedElem) * vq->size));
 243
 244     /* < 1 because we add elements to avail queue one by one */
 245     if ((flags & QVRING_USED_F_NO_NOTIFY) == 0 &&
 246                             (!vq->event || (uint16_t)(idx-avail_event) < 1)) {
 247         bus->virtqueue_kick(d, vq);
 248     }
 249 }
 250
 251 void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx)
 252 {
 253     g_assert(vq->event);
 254
 255     /* vq->avail->used_event */
 256     writew(vq->avail + 4 + (2 * vq->size), idx);
 257 }