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/*
* libqos virtio MMIO driver
*
* Copyright (c) 2014 Marc Marí
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "libqtest.h"
#include "libqos/virtio.h"
#include "libqos/virtio-mmio.h"
#include "libqos/malloc.h"
#include "libqos/malloc-generic.h"
#include "standard-headers/linux/virtio_ring.h"
static uint8_t qvirtio_mmio_config_readb(QVirtioDevice *d, uint64_t addr)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return readb(dev->addr + addr);
}
static uint16_t qvirtio_mmio_config_readw(QVirtioDevice *d, uint64_t addr)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return readw(dev->addr + addr);
}
static uint32_t qvirtio_mmio_config_readl(QVirtioDevice *d, uint64_t addr)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return readl(dev->addr + addr);
}
static uint64_t qvirtio_mmio_config_readq(QVirtioDevice *d, uint64_t addr)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return readq(dev->addr + addr);
}
static uint32_t qvirtio_mmio_get_features(QVirtioDevice *d)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
writel(dev->addr + QVIRTIO_MMIO_HOST_FEATURES_SEL, 0);
return readl(dev->addr + QVIRTIO_MMIO_HOST_FEATURES);
}
static void qvirtio_mmio_set_features(QVirtioDevice *d, uint32_t features)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
dev->features = features;
writel(dev->addr + QVIRTIO_MMIO_GUEST_FEATURES_SEL, 0);
writel(dev->addr + QVIRTIO_MMIO_GUEST_FEATURES, features);
}
static uint32_t qvirtio_mmio_get_guest_features(QVirtioDevice *d)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return dev->features;
}
static uint8_t qvirtio_mmio_get_status(QVirtioDevice *d)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return (uint8_t)readl(dev->addr + QVIRTIO_MMIO_DEVICE_STATUS);
}
static void qvirtio_mmio_set_status(QVirtioDevice *d, uint8_t status)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
writel(dev->addr + QVIRTIO_MMIO_DEVICE_STATUS, (uint32_t)status);
}
static bool qvirtio_mmio_get_queue_isr_status(QVirtioDevice *d, QVirtQueue *vq)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
uint32_t isr;
isr = readl(dev->addr + QVIRTIO_MMIO_INTERRUPT_STATUS) & 1;
if (isr != 0) {
writel(dev->addr + QVIRTIO_MMIO_INTERRUPT_ACK, 1);
return true;
}
return false;
}
static bool qvirtio_mmio_get_config_isr_status(QVirtioDevice *d)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
uint32_t isr;
isr = readl(dev->addr + QVIRTIO_MMIO_INTERRUPT_STATUS) & 2;
if (isr != 0) {
writel(dev->addr + QVIRTIO_MMIO_INTERRUPT_ACK, 2);
return true;
}
return false;
}
static void qvirtio_mmio_queue_select(QVirtioDevice *d, uint16_t index)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
writel(dev->addr + QVIRTIO_MMIO_QUEUE_SEL, (uint32_t)index);
g_assert_cmphex(readl(dev->addr + QVIRTIO_MMIO_QUEUE_PFN), ==, 0);
}
static uint16_t qvirtio_mmio_get_queue_size(QVirtioDevice *d)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
return (uint16_t)readl(dev->addr + QVIRTIO_MMIO_QUEUE_NUM_MAX);
}
static void qvirtio_mmio_set_queue_address(QVirtioDevice *d, uint32_t pfn)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
writel(dev->addr + QVIRTIO_MMIO_QUEUE_PFN, pfn);
}
static QVirtQueue *qvirtio_mmio_virtqueue_setup(QVirtioDevice *d,
QGuestAllocator *alloc, uint16_t index)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
QVirtQueue *vq;
uint64_t addr;
vq = g_malloc0(sizeof(*vq));
qvirtio_mmio_queue_select(d, index);
writel(dev->addr + QVIRTIO_MMIO_QUEUE_ALIGN, dev->page_size);
vq->index = index;
vq->size = qvirtio_mmio_get_queue_size(d);
vq->free_head = 0;
vq->num_free = vq->size;
vq->align = dev->page_size;
vq->indirect = (dev->features & (1u << VIRTIO_RING_F_INDIRECT_DESC)) != 0;
vq->event = (dev->features & (1u << VIRTIO_RING_F_EVENT_IDX)) != 0;
writel(dev->addr + QVIRTIO_MMIO_QUEUE_NUM, vq->size);
/* Check different than 0 */
g_assert_cmpint(vq->size, !=, 0);
/* Check power of 2 */
g_assert_cmpint(vq->size & (vq->size - 1), ==, 0);
addr = guest_alloc(alloc, qvring_size(vq->size, dev->page_size));
qvring_init(alloc, vq, addr);
qvirtio_mmio_set_queue_address(d, vq->desc / dev->page_size);
return vq;
}
static void qvirtio_mmio_virtqueue_cleanup(QVirtQueue *vq,
QGuestAllocator *alloc)
{
guest_free(alloc, vq->desc);
g_free(vq);
}
static void qvirtio_mmio_virtqueue_kick(QVirtioDevice *d, QVirtQueue *vq)
{
QVirtioMMIODevice *dev = (QVirtioMMIODevice *)d;
writel(dev->addr + QVIRTIO_MMIO_QUEUE_NOTIFY, vq->index);
}
const QVirtioBus qvirtio_mmio = {
.config_readb = qvirtio_mmio_config_readb,
.config_readw = qvirtio_mmio_config_readw,
.config_readl = qvirtio_mmio_config_readl,
.config_readq = qvirtio_mmio_config_readq,
.get_features = qvirtio_mmio_get_features,
.set_features = qvirtio_mmio_set_features,
.get_guest_features = qvirtio_mmio_get_guest_features,
.get_status = qvirtio_mmio_get_status,
.set_status = qvirtio_mmio_set_status,
.get_queue_isr_status = qvirtio_mmio_get_queue_isr_status,
.get_config_isr_status = qvirtio_mmio_get_config_isr_status,
.queue_select = qvirtio_mmio_queue_select,
.get_queue_size = qvirtio_mmio_get_queue_size,
.set_queue_address = qvirtio_mmio_set_queue_address,
.virtqueue_setup = qvirtio_mmio_virtqueue_setup,
.virtqueue_cleanup = qvirtio_mmio_virtqueue_cleanup,
.virtqueue_kick = qvirtio_mmio_virtqueue_kick,
};
QVirtioMMIODevice *qvirtio_mmio_init_device(uint64_t addr, uint32_t page_size)
{
QVirtioMMIODevice *dev;
uint32_t magic;
dev = g_malloc0(sizeof(*dev));
magic = readl(addr + QVIRTIO_MMIO_MAGIC_VALUE);
g_assert(magic == ('v' | 'i' << 8 | 'r' << 16 | 't' << 24));
dev->addr = addr;
dev->page_size = page_size;
dev->vdev.device_type = readl(addr + QVIRTIO_MMIO_DEVICE_ID);
dev->vdev.bus = &qvirtio_mmio;
writel(addr + QVIRTIO_MMIO_GUEST_PAGE_SIZE, page_size);
return dev;
}
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