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
  15 uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
  16                                                                 uint64_t addr)
  17 {
  18     return bus->config_readb(d, addr);
  19 }
  20
  21 uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
  22                                                                 uint64_t addr)
  23 {
  24     return bus->config_readw(d, addr);
  25 }
  26
  27 uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
  28                                                                 uint64_t addr)
  29 {
  30     return bus->config_readl(d, addr);
  31 }
  32
  33 uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
  34                                                                 uint64_t addr)
  35 {
  36     return bus->config_readq(d, addr);
  37 }
  38
  39 uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d)
  40 {
  41     return bus->get_features(d);
  42 }
  43
  44 void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
  45                                                             uint32_t features)
  46 {
  47     bus->set_features(d, features);
  48 }
  49
  50 QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
  51                                         QGuestAllocator *alloc, uint16_t index)
  52 {
  53     return bus->virtqueue_setup(d, alloc, index);
  54 }
  55
  56 void 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
  62 void 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
  68 void 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
  75 void 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
  82 void 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  */
 101 uint8_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
 118 void 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
 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(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
 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(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
 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 |= 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
 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 |= 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
 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(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
 249 void 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
 276 void 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 }