blob: 485b8f6b7e052d8e4a3f3b5f71e1077bd8779eb4 [file] [log] [blame]
/*
* libqos virtio PCI driver
*
* Copyright (c) 2014 Marc MarĂ­
*
* 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 "virtio.h"
#include "virtio-pci.h"
#include "pci.h"
#include "pci-pc.h"
#include "libqos-malloc.h"
#include "malloc-pc.h"
#include "qgraph.h"
#include "standard-headers/linux/virtio_ring.h"
#include "standard-headers/linux/virtio_pci.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_regs.h"
#include "virtio-pci-modern.h"
/* virtio-pci is a superclass of all virtio-xxx-pci devices;
* the relation between virtio-pci and virtio-xxx-pci is implicit,
* and therefore virtio-pci does not produce virtio and is not
* reached by any edge, not even as a "contains" edge.
* In facts, every device is a QVirtioPCIDevice with
* additional fields, since every one has its own
* number of queues and various attributes.
* Virtio-pci provides default functions to start the
* hw and destroy the object, and nodes that want to
* override them should always remember to call the
* original qvirtio_pci_destructor and qvirtio_pci_start_hw.
*/
#define CONFIG_BASE(dev) (VIRTIO_PCI_CONFIG_OFF((dev)->pdev->msix_enabled))
static uint8_t qvirtio_pci_config_readb(QVirtioDevice *d, uint64_t off)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
return qpci_io_readb(dev->pdev, dev->bar, CONFIG_BASE(dev) + off);
}
/* PCI is always read in little-endian order
* but virtio ( < 1.0) is in guest order
* so with a big-endian guest the order has been reversed,
* reverse it again
* virtio-1.0 is always little-endian, like PCI
*/
static uint16_t qvirtio_pci_config_readw(QVirtioDevice *d, uint64_t off)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
uint16_t value;
value = qpci_io_readw(dev->pdev, dev->bar, CONFIG_BASE(dev) + off);
if (qvirtio_is_big_endian(d)) {
value = bswap16(value);
}
return value;
}
static uint32_t qvirtio_pci_config_readl(QVirtioDevice *d, uint64_t off)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
uint32_t value;
value = qpci_io_readl(dev->pdev, dev->bar, CONFIG_BASE(dev) + off);
if (qvirtio_is_big_endian(d)) {
value = bswap32(value);
}
return value;
}
static uint64_t qvirtio_pci_config_readq(QVirtioDevice *d, uint64_t off)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
uint64_t val;
val = qpci_io_readq(dev->pdev, dev->bar, CONFIG_BASE(dev) + off);
if (qvirtio_is_big_endian(d)) {
val = bswap64(val);
}
return val;
}
static uint64_t qvirtio_pci_get_features(QVirtioDevice *d)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
return qpci_io_readl(dev->pdev, dev->bar, VIRTIO_PCI_HOST_FEATURES);
}
static void qvirtio_pci_set_features(QVirtioDevice *d, uint64_t features)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
qpci_io_writel(dev->pdev, dev->bar, VIRTIO_PCI_GUEST_FEATURES, features);
}
static uint64_t qvirtio_pci_get_guest_features(QVirtioDevice *d)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
return qpci_io_readl(dev->pdev, dev->bar, VIRTIO_PCI_GUEST_FEATURES);
}
static uint8_t qvirtio_pci_get_status(QVirtioDevice *d)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
return qpci_io_readb(dev->pdev, dev->bar, VIRTIO_PCI_STATUS);
}
static void qvirtio_pci_set_status(QVirtioDevice *d, uint8_t status)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
qpci_io_writeb(dev->pdev, dev->bar, VIRTIO_PCI_STATUS, status);
}
static bool qvirtio_pci_get_queue_isr_status(QVirtioDevice *d, QVirtQueue *vq)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
QVirtQueuePCI *vqpci = (QVirtQueuePCI *)vq;
uint32_t data;
if (dev->pdev->msix_enabled) {
g_assert_cmpint(vqpci->msix_entry, !=, -1);
if (qpci_msix_masked(dev->pdev, vqpci->msix_entry)) {
/* No ISR checking should be done if masked, but read anyway */
return qpci_msix_pending(dev->pdev, vqpci->msix_entry);
} else {
data = qtest_readl(dev->pdev->bus->qts, vqpci->msix_addr);
if (data == vqpci->msix_data) {
qtest_writel(dev->pdev->bus->qts, vqpci->msix_addr, 0);
return true;
} else {
return false;
}
}
} else {
return qpci_io_readb(dev->pdev, dev->bar, VIRTIO_PCI_ISR) & 1;
}
}
static bool qvirtio_pci_get_config_isr_status(QVirtioDevice *d)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
uint32_t data;
if (dev->pdev->msix_enabled) {
g_assert_cmpint(dev->config_msix_entry, !=, -1);
if (qpci_msix_masked(dev->pdev, dev->config_msix_entry)) {
/* No ISR checking should be done if masked, but read anyway */
return qpci_msix_pending(dev->pdev, dev->config_msix_entry);
} else {
data = qtest_readl(dev->pdev->bus->qts, dev->config_msix_addr);
if (data == dev->config_msix_data) {
qtest_writel(dev->pdev->bus->qts, dev->config_msix_addr, 0);
return true;
} else {
return false;
}
}
} else {
return qpci_io_readb(dev->pdev, dev->bar, VIRTIO_PCI_ISR) & 2;
}
}
static void qvirtio_pci_wait_config_isr_status(QVirtioDevice *d,
gint64 timeout_us)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
gint64 start_time = g_get_monotonic_time();
do {
g_assert(g_get_monotonic_time() - start_time <= timeout_us);
qtest_clock_step(dev->pdev->bus->qts, 100);
} while (!qvirtio_pci_get_config_isr_status(d));
}
static void qvirtio_pci_queue_select(QVirtioDevice *d, uint16_t index)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
qpci_io_writeb(dev->pdev, dev->bar, VIRTIO_PCI_QUEUE_SEL, index);
}
static uint16_t qvirtio_pci_get_queue_size(QVirtioDevice *d)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
return qpci_io_readw(dev->pdev, dev->bar, VIRTIO_PCI_QUEUE_NUM);
}
static void qvirtio_pci_set_queue_address(QVirtioDevice *d, QVirtQueue *vq)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
uint64_t pfn = vq->desc / VIRTIO_PCI_VRING_ALIGN;
qpci_io_writel(dev->pdev, dev->bar, VIRTIO_PCI_QUEUE_PFN, pfn);
}
QVirtQueue *qvirtio_pci_virtqueue_setup_common(QVirtioDevice *d,
QGuestAllocator *alloc,
uint16_t index)
{
uint64_t feat;
uint64_t addr;
QVirtQueuePCI *vqpci;
QVirtioPCIDevice *qvpcidev = container_of(d, QVirtioPCIDevice, vdev);
vqpci = g_malloc0(sizeof(*vqpci));
feat = d->bus->get_guest_features(d);
d->bus->queue_select(d, index);
vqpci->vq.vdev = d;
vqpci->vq.index = index;
vqpci->vq.size = d->bus->get_queue_size(d);
vqpci->vq.free_head = 0;
vqpci->vq.num_free = vqpci->vq.size;
vqpci->vq.align = VIRTIO_PCI_VRING_ALIGN;
vqpci->vq.indirect = feat & (1ull << VIRTIO_RING_F_INDIRECT_DESC);
vqpci->vq.event = feat & (1ull << VIRTIO_RING_F_EVENT_IDX);
vqpci->msix_entry = -1;
vqpci->msix_addr = 0;
vqpci->msix_data = 0x12345678;
/* Check different than 0 */
g_assert_cmpint(vqpci->vq.size, !=, 0);
/* Check power of 2 */
g_assert_cmpint(vqpci->vq.size & (vqpci->vq.size - 1), ==, 0);
addr = guest_alloc(alloc, qvring_size(vqpci->vq.size,
VIRTIO_PCI_VRING_ALIGN));
qvring_init(qvpcidev->pdev->bus->qts, alloc, &vqpci->vq, addr);
d->bus->set_queue_address(d, &vqpci->vq);
return &vqpci->vq;
}
void qvirtio_pci_virtqueue_cleanup_common(QVirtQueue *vq,
QGuestAllocator *alloc)
{
QVirtQueuePCI *vqpci = container_of(vq, QVirtQueuePCI, vq);
guest_free(alloc, vq->desc);
g_free(vqpci);
}
static void qvirtio_pci_virtqueue_kick(QVirtioDevice *d, QVirtQueue *vq)
{
QVirtioPCIDevice *dev = container_of(d, QVirtioPCIDevice, vdev);
qpci_io_writew(dev->pdev, dev->bar, VIRTIO_PCI_QUEUE_NOTIFY, vq->index);
}
static const QVirtioBus qvirtio_pci_legacy = {
.config_readb = qvirtio_pci_config_readb,
.config_readw = qvirtio_pci_config_readw,
.config_readl = qvirtio_pci_config_readl,
.config_readq = qvirtio_pci_config_readq,
.get_features = qvirtio_pci_get_features,
.set_features = qvirtio_pci_set_features,
.get_guest_features = qvirtio_pci_get_guest_features,
.get_status = qvirtio_pci_get_status,
.set_status = qvirtio_pci_set_status,
.get_queue_isr_status = qvirtio_pci_get_queue_isr_status,
.wait_config_isr_status = qvirtio_pci_wait_config_isr_status,
.queue_select = qvirtio_pci_queue_select,
.get_queue_size = qvirtio_pci_get_queue_size,
.set_queue_address = qvirtio_pci_set_queue_address,
.virtqueue_setup = qvirtio_pci_virtqueue_setup_common,
.virtqueue_cleanup = qvirtio_pci_virtqueue_cleanup_common,
.virtqueue_kick = qvirtio_pci_virtqueue_kick,
};
static void qvirtio_pci_set_config_vector(QVirtioPCIDevice *d, uint16_t entry)
{
uint16_t vector;
qpci_io_writew(d->pdev, d->bar, VIRTIO_MSI_CONFIG_VECTOR, entry);
vector = qpci_io_readw(d->pdev, d->bar, VIRTIO_MSI_CONFIG_VECTOR);
g_assert_cmphex(vector, !=, VIRTIO_MSI_NO_VECTOR);
}
static void qvirtio_pci_set_queue_vector(QVirtioPCIDevice *d, uint16_t vq_idx,
uint16_t entry)
{
uint16_t vector;
qvirtio_pci_queue_select(&d->vdev, vq_idx);
qpci_io_writew(d->pdev, d->bar, VIRTIO_MSI_QUEUE_VECTOR, entry);
vector = qpci_io_readw(d->pdev, d->bar, VIRTIO_MSI_QUEUE_VECTOR);
g_assert_cmphex(vector, !=, VIRTIO_MSI_NO_VECTOR);
}
static const QVirtioPCIMSIXOps qvirtio_pci_msix_ops_legacy = {
.set_config_vector = qvirtio_pci_set_config_vector,
.set_queue_vector = qvirtio_pci_set_queue_vector,
};
void qvirtio_pci_device_enable(QVirtioPCIDevice *d)
{
qpci_device_enable(d->pdev);
d->bar = qpci_iomap(d->pdev, d->bar_idx, NULL);
}
void qvirtio_pci_device_disable(QVirtioPCIDevice *d)
{
qpci_iounmap(d->pdev, d->bar);
}
void qvirtqueue_pci_msix_setup(QVirtioPCIDevice *d, QVirtQueuePCI *vqpci,
QGuestAllocator *alloc, uint16_t entry)
{
uint32_t control;
uint64_t off;
g_assert(d->pdev->msix_enabled);
off = d->pdev->msix_table_off + (entry * 16);
g_assert_cmpint(entry, >=, 0);
g_assert_cmpint(entry, <, qpci_msix_table_size(d->pdev));
vqpci->msix_entry = entry;
vqpci->msix_addr = guest_alloc(alloc, 4);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_LOWER_ADDR, vqpci->msix_addr & ~0UL);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_UPPER_ADDR,
(vqpci->msix_addr >> 32) & ~0UL);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_DATA, vqpci->msix_data);
control = qpci_io_readl(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_VECTOR_CTRL);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_VECTOR_CTRL,
control & ~PCI_MSIX_ENTRY_CTRL_MASKBIT);
d->msix_ops->set_queue_vector(d, vqpci->vq.index, entry);
}
void qvirtio_pci_set_msix_configuration_vector(QVirtioPCIDevice *d,
QGuestAllocator *alloc, uint16_t entry)
{
uint32_t control;
uint64_t off;
g_assert(d->pdev->msix_enabled);
off = d->pdev->msix_table_off + (entry * 16);
g_assert_cmpint(entry, >=, 0);
g_assert_cmpint(entry, <, qpci_msix_table_size(d->pdev));
d->config_msix_entry = entry;
d->config_msix_data = 0x12345678;
d->config_msix_addr = guest_alloc(alloc, 4);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_LOWER_ADDR, d->config_msix_addr & ~0UL);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_UPPER_ADDR,
(d->config_msix_addr >> 32) & ~0UL);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_DATA, d->config_msix_data);
control = qpci_io_readl(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_VECTOR_CTRL);
qpci_io_writel(d->pdev, d->pdev->msix_table_bar,
off + PCI_MSIX_ENTRY_VECTOR_CTRL,
control & ~PCI_MSIX_ENTRY_CTRL_MASKBIT);
d->msix_ops->set_config_vector(d, entry);
}
void qvirtio_pci_destructor(QOSGraphObject *obj)
{
QVirtioPCIDevice *dev = (QVirtioPCIDevice *)obj;
qvirtio_pci_device_disable(dev);
g_free(dev->pdev);
}
void qvirtio_pci_start_hw(QOSGraphObject *obj)
{
QVirtioPCIDevice *dev = (QVirtioPCIDevice *)obj;
qvirtio_pci_device_enable(dev);
qvirtio_start_device(&dev->vdev);
}
static void qvirtio_pci_init_legacy(QVirtioPCIDevice *dev)
{
dev->vdev.device_type = qpci_config_readw(dev->pdev, PCI_SUBSYSTEM_ID);
dev->bar_idx = 0;
dev->vdev.bus = &qvirtio_pci_legacy;
dev->msix_ops = &qvirtio_pci_msix_ops_legacy;
dev->vdev.big_endian = qtest_big_endian(dev->pdev->bus->qts);
}
static void qvirtio_pci_init_from_pcidev(QVirtioPCIDevice *dev, QPCIDevice *pci_dev)
{
dev->pdev = pci_dev;
dev->config_msix_entry = -1;
if (!qvirtio_pci_init_virtio_1(dev)) {
qvirtio_pci_init_legacy(dev);
}
/* each virtio-xxx-pci device should override at least this function */
dev->obj.get_driver = NULL;
dev->obj.start_hw = qvirtio_pci_start_hw;
dev->obj.destructor = qvirtio_pci_destructor;
}
void virtio_pci_init(QVirtioPCIDevice *dev, QPCIBus *bus, QPCIAddress * addr)
{
QPCIDevice *pci_dev = qpci_device_find(bus, addr->devfn);
g_assert_nonnull(pci_dev);
qvirtio_pci_init_from_pcidev(dev, pci_dev);
}
QVirtioPCIDevice *virtio_pci_new(QPCIBus *bus, QPCIAddress * addr)
{
QVirtioPCIDevice *dev;
QPCIDevice *pci_dev = qpci_device_find(bus, addr->devfn);
if (!pci_dev) {
return NULL;
}
dev = g_new0(QVirtioPCIDevice, 1);
qvirtio_pci_init_from_pcidev(dev, pci_dev);
dev->obj.free = g_free;
return dev;
}