tests/libqos/virtio-mmio.c

   1 /*
   2  * libqos virtio MMIO 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 "libqos/virtio-mmio.h"
  14 #include "libqos/malloc.h"
  15 #include "libqos/malloc-generic.h"
  16 #include "standard-headers/linux/virtio_ring.h"
  17
  18 static uint8_t qvirtio_mmio_config_readb(QVirtioDevice *d, uint64_t addr)
  19 {
  20     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  21     return readb(dev->addr + addr);
  22 }
  23
  24 static uint16_t qvirtio_mmio_config_readw(QVirtioDevice *d, uint64_t addr)
  25 {
  26     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  27     return readw(dev->addr + addr);
  28 }
  29
  30 static uint32_t qvirtio_mmio_config_readl(QVirtioDevice *d, uint64_t addr)
  31 {
  32     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  33     return readl(dev->addr + addr);
  34 }
  35
  36 static uint64_t qvirtio_mmio_config_readq(QVirtioDevice *d, uint64_t addr)
  37 {
  38     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  39     return readq(dev->addr + addr);
  40 }
  41
  42 static uint32_t qvirtio_mmio_get_features(QVirtioDevice *d)
  43 {
  44     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  45     writel(dev->addr + QVIRTIO_MMIO_HOST_FEATURES_SEL, 0);
  46     return readl(dev->addr + QVIRTIO_MMIO_HOST_FEATURES);
  47 }
  48
  49 static void qvirtio_mmio_set_features(QVirtioDevice *d, uint32_t features)
  50 {
  51     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  52     dev->features = features;
  53     writel(dev->addr + QVIRTIO_MMIO_GUEST_FEATURES_SEL, 0);
  54     writel(dev->addr + QVIRTIO_MMIO_GUEST_FEATURES, features);
  55 }
  56
  57 static uint32_t qvirtio_mmio_get_guest_features(QVirtioDevice *d)
  58 {
  59     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  60     return dev->features;
  61 }
  62
  63 static uint8_t qvirtio_mmio_get_status(QVirtioDevice *d)
  64 {
  65     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  66     return (uint8_t)readl(dev->addr + QVIRTIO_MMIO_DEVICE_STATUS);
  67 }
  68
  69 static void qvirtio_mmio_set_status(QVirtioDevice *d, uint8_t status)
  70 {
  71     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  72     writel(dev->addr + QVIRTIO_MMIO_DEVICE_STATUS, (uint32_t)status);
  73 }
  74
  75 static bool qvirtio_mmio_get_queue_isr_status(QVirtioDevice *d, QVirtQueue *vq)
  76 {
  77     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  78     uint32_t isr;
  79
  80     isr = readl(dev->addr + QVIRTIO_MMIO_INTERRUPT_STATUS) & 1;
  81     if (isr != 0) {
  82         writel(dev->addr + QVIRTIO_MMIO_INTERRUPT_ACK, 1);
  83         return true;
  84     }
  85
  86     return false;
  87 }
  88
  89 static bool qvirtio_mmio_get_config_isr_status(QVirtioDevice *d)
  90 {
  91     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
  92     uint32_t isr;
  93
  94     isr = readl(dev->addr + QVIRTIO_MMIO_INTERRUPT_STATUS) & 2;
  95     if (isr != 0) {
  96         writel(dev->addr + QVIRTIO_MMIO_INTERRUPT_ACK, 2);
  97         return true;
  98     }
  99
 100     return false;
 101 }
 102
 103 static void qvirtio_mmio_queue_select(QVirtioDevice *d, uint16_t index)
 104 {
 105     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
 106     writel(dev->addr + QVIRTIO_MMIO_QUEUE_SEL, (uint32_t)index);
 107
 108     g_assert_cmphex(readl(dev->addr + QVIRTIO_MMIO_QUEUE_PFN), ==, 0);
 109 }
 110
 111 static uint16_t qvirtio_mmio_get_queue_size(QVirtioDevice *d)
 112 {
 113     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
 114     return (uint16_t)readl(dev->addr + QVIRTIO_MMIO_QUEUE_NUM_MAX);
 115 }
 116
 117 static void qvirtio_mmio_set_queue_address(QVirtioDevice *d, uint32_t pfn)
 118 {
 119     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
 120     writel(dev->addr + QVIRTIO_MMIO_QUEUE_PFN, pfn);
 121 }
 122
 123 static QVirtQueue *qvirtio_mmio_virtqueue_setup(QVirtioDevice *d,
 124                                         QGuestAllocator *alloc, uint16_t index)
 125 {
 126     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
 127     QVirtQueue *vq;
 128     uint64_t addr;
 129
 130     vq = g_malloc0(sizeof(*vq));
 131     qvirtio_mmio_queue_select(d, index);
 132     writel(dev->addr + QVIRTIO_MMIO_QUEUE_ALIGN, dev->page_size);
 133
 134     vq->index = index;
 135     vq->size = qvirtio_mmio_get_queue_size(d);
 136     vq->free_head = 0;
 137     vq->num_free = vq->size;
 138     vq->align = dev->page_size;
 139     vq->indirect = (dev->features & (1u << VIRTIO_RING_F_INDIRECT_DESC)) != 0;
 140     vq->event = (dev->features & (1u << VIRTIO_RING_F_EVENT_IDX)) != 0;
 141
 142     writel(dev->addr + QVIRTIO_MMIO_QUEUE_NUM, vq->size);
 143
 144     /* Check different than 0 */
 145     g_assert_cmpint(vq->size, !=, 0);
 146
 147     /* Check power of 2 */
 148     g_assert_cmpint(vq->size & (vq->size - 1), ==, 0);
 149
 150     addr = guest_alloc(alloc, qvring_size(vq->size, dev->page_size));
 151     qvring_init(alloc, vq, addr);
 152     qvirtio_mmio_set_queue_address(d, vq->desc / dev->page_size);
 153
 154     return vq;
 155 }
 156
 157 static void qvirtio_mmio_virtqueue_cleanup(QVirtQueue *vq,
 158                                            QGuestAllocator *alloc)
 159 {
 160     guest_free(alloc, vq->desc);
 161     g_free(vq);
 162 }
 163
 164 static void qvirtio_mmio_virtqueue_kick(QVirtioDevice *d, QVirtQueue *vq)
 165 {
 166     QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
 167     writel(dev->addr + QVIRTIO_MMIO_QUEUE_NOTIFY, vq->index);
 168 }
 169
 170 const QVirtioBus qvirtio_mmio = {
 171     .config_readb = qvirtio_mmio_config_readb,
 172     .config_readw = qvirtio_mmio_config_readw,
 173     .config_readl = qvirtio_mmio_config_readl,
 174     .config_readq = qvirtio_mmio_config_readq,
 175     .get_features = qvirtio_mmio_get_features,
 176     .set_features = qvirtio_mmio_set_features,
 177     .get_guest_features = qvirtio_mmio_get_guest_features,
 178     .get_status = qvirtio_mmio_get_status,
 179     .set_status = qvirtio_mmio_set_status,
 180     .get_queue_isr_status = qvirtio_mmio_get_queue_isr_status,
 181     .get_config_isr_status = qvirtio_mmio_get_config_isr_status,
 182     .queue_select = qvirtio_mmio_queue_select,
 183     .get_queue_size = qvirtio_mmio_get_queue_size,
 184     .set_queue_address = qvirtio_mmio_set_queue_address,
 185     .virtqueue_setup = qvirtio_mmio_virtqueue_setup,
 186     .virtqueue_cleanup = qvirtio_mmio_virtqueue_cleanup,
 187     .virtqueue_kick = qvirtio_mmio_virtqueue_kick,
 188 };
 189
 190 QVirtioMMIODevice *qvirtio_mmio_init_device(uint64_t addr, uint32_t page_size)
 191 {
 192     QVirtioMMIODevice *dev;
 193     uint32_t magic;
 194     dev = g_malloc0(sizeof(*dev));
 195
 196     magic = readl(addr + QVIRTIO_MMIO_MAGIC_VALUE);
 197     g_assert(magic == ('v' | 'i' << 8 | 'r' << 16 | 't' << 24));
 198
 199     dev->addr = addr;
 200     dev->page_size = page_size;
 201     dev->vdev.device_type = readl(addr + QVIRTIO_MMIO_DEVICE_ID);
 202
 203     writel(addr + QVIRTIO_MMIO_GUEST_PAGE_SIZE, page_size);
 204
 205     return dev;
 206 }