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_isr(const QVirtioBus *bus, QVirtioDevice *d, uint8_t mask,
  82                                                             uint64_t timeout)
  83 {
  84     do {
  85         clock_step(10);
  86         if (bus->get_isr_status(d) & mask) {
  87             break; /* It has ended */
  88         }
  89     } while (--timeout);
  90
  91     return timeout != 0;
  92 }
  93
  94 void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr)
  95 {
  96     int i;
  97
  98     vq->desc = addr;
  99     vq->avail = vq->desc + vq->size*sizeof(QVRingDesc);
 100     vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size)
 101         + vq->align - 1) & ~(vq->align - 1));
 102
 103     for (i = 0; i < vq->size - 1; i++) {
 104         /* vq->desc[i].addr */
 105         writew(vq->desc + (16 * i), 0);
 106         /* vq->desc[i].next */
 107         writew(vq->desc + (16 * i) + 14, i + 1);
 108     }
 109
 110     /* vq->avail->flags */
 111     writew(vq->avail, 0);
 112     /* vq->avail->idx */
 113     writew(vq->avail + 2, 0);
 114
 115     /* vq->used->flags */
 116     writew(vq->used, 0);
 117 }
 118
 119 uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
 120                                                                     bool next)
 121 {
 122     uint16_t flags = 0;
 123     vq->num_free--;
 124
 125     if (write) {
 126         flags |= QVRING_DESC_F_WRITE;
 127     }
 128
 129     if (next) {
 130         flags |= QVRING_DESC_F_NEXT;
 131     }
 132
 133     /* vq->desc[vq->free_head].addr */
 134     writeq(vq->desc + (16 * vq->free_head), data);
 135     /* vq->desc[vq->free_head].len */
 136     writel(vq->desc + (16 * vq->free_head) + 8, len);
 137     /* vq->desc[vq->free_head].flags */
 138     writew(vq->desc + (16 * vq->free_head) + 12, flags);
 139
 140     return vq->free_head++; /* Return and increase, in this order */
 141 }
 142
 143 void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
 144                                                             uint32_t free_head)
 145 {
 146     /* vq->avail->idx */
 147     uint16_t idx = readl(vq->avail + 2);
 148
 149     /* vq->avail->ring[idx % vq->size] */
 150     writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head);
 151     /* vq->avail->idx */
 152     writel(vq->avail + 2, idx + 1);
 153
 154     bus->virtqueue_kick(d, vq);
 155 }