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(10);
  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(10);
  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
 128     /* vq->used->flags */
 129     writew(vq->used, 0);
 130 }
 131
 132 QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
 133                                         QGuestAllocator *alloc, uint16_t elem)
 134 {
 135     int i;
 136     QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect));
 137
 138     indirect->index = 0;
 139     indirect->elem = elem;
 140     indirect->desc = guest_alloc(alloc, sizeof(QVRingDesc)*elem);
 141
 142     for (i = 0; i < elem - 1; ++i) {
 143         /* indirect->desc[i].addr */
 144         writeq(indirect->desc + (16 * i), 0);
 145         /* indirect->desc[i].flags */
 146         writew(indirect->desc + (16 * i) + 12, QVRING_DESC_F_NEXT);
 147         /* indirect->desc[i].next */
 148         writew(indirect->desc + (16 * i) + 14, i + 1);
 149     }
 150
 151     return indirect;
 152 }
 153
 154 void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
 155                                                     uint32_t len, bool write)
 156 {
 157     uint16_t flags;
 158
 159     g_assert_cmpint(indirect->index, <, indirect->elem);
 160
 161     flags = readw(indirect->desc + (16 * indirect->index) + 12);
 162
 163     if (write) {
 164         flags |= QVRING_DESC_F_WRITE;
 165     }
 166
 167     /* indirect->desc[indirect->index].addr */
 168     writeq(indirect->desc + (16 * indirect->index), data);
 169     /* indirect->desc[indirect->index].len */
 170     writel(indirect->desc + (16 * indirect->index) + 8, len);
 171     /* indirect->desc[indirect->index].flags */
 172     writew(indirect->desc + (16 * indirect->index) + 12, flags);
 173
 174     indirect->index++;
 175 }
 176
 177 uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
 178                                                                     bool next)
 179 {
 180     uint16_t flags = 0;
 181     vq->num_free--;
 182
 183     if (write) {
 184         flags |= QVRING_DESC_F_WRITE;
 185     }
 186
 187     if (next) {
 188         flags |= QVRING_DESC_F_NEXT;
 189     }
 190
 191     /* vq->desc[vq->free_head].addr */
 192     writeq(vq->desc + (16 * vq->free_head), data);
 193     /* vq->desc[vq->free_head].len */
 194     writel(vq->desc + (16 * vq->free_head) + 8, len);
 195     /* vq->desc[vq->free_head].flags */
 196     writew(vq->desc + (16 * vq->free_head) + 12, flags);
 197
 198     return vq->free_head++; /* Return and increase, in this order */
 199 }
 200
 201 uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect)
 202 {
 203     g_assert(vq->indirect);
 204     g_assert_cmpint(vq->size, >=, indirect->elem);
 205     g_assert_cmpint(indirect->index, ==, indirect->elem);
 206
 207     vq->num_free--;
 208
 209     /* vq->desc[vq->free_head].addr */
 210     writeq(vq->desc + (16 * vq->free_head), indirect->desc);
 211     /* vq->desc[vq->free_head].len */
 212     writel(vq->desc + (16 * vq->free_head) + 8,
 213                                         sizeof(QVRingDesc) * indirect->elem);
 214     /* vq->desc[vq->free_head].flags */
 215     writew(vq->desc + (16 * vq->free_head) + 12, QVRING_DESC_F_INDIRECT);
 216
 217     return vq->free_head++; /* Return and increase, in this order */
 218 }
 219
 220 void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
 221                                                             uint32_t free_head)
 222 {
 223     /* vq->avail->idx */
 224     uint16_t idx = readl(vq->avail + 2);
 225
 226     /* vq->avail->ring[idx % vq->size] */
 227     writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
 228     /* vq->avail->idx */
 229     writel(vq->avail + 2, idx + 1);
 230
 231     bus->virtqueue_kick(d, vq);
 232 }