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/*
* PCI Expander Bridge Device Emulation
*
* Copyright (C) 2015 Red Hat Inc
*
* Authors:
* Marcel Apfelbaum <marcel@redhat.com>
*
* 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 "hw/pci/pci.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci/pci_host.h"
#include "hw/pci/pci_bus.h"
#include "hw/i386/pc.h"
#include "qemu/range.h"
#include "qemu/error-report.h"
#define TYPE_PXB_BUS "pxb-bus"
#define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS)
typedef struct PXBBus {
/*< private >*/
PCIBus parent_obj;
/*< public >*/
char bus_path[8];
} PXBBus;
#define TYPE_PXB_DEVICE "pxb"
#define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE)
typedef struct PXBDev {
/*< private >*/
PCIDevice parent_obj;
/*< public >*/
uint8_t bus_nr;
} PXBDev;
#define TYPE_PXB_HOST "pxb-host"
static int pxb_bus_num(PCIBus *bus)
{
PXBDev *pxb = PXB_DEV(bus->parent_dev);
return pxb->bus_nr;
}
static bool pxb_is_root(PCIBus *bus)
{
return true; /* by definition */
}
static void pxb_bus_class_init(ObjectClass *class, void *data)
{
PCIBusClass *pbc = PCI_BUS_CLASS(class);
pbc->bus_num = pxb_bus_num;
pbc->is_root = pxb_is_root;
}
static const TypeInfo pxb_bus_info = {
.name = TYPE_PXB_BUS,
.parent = TYPE_PCI_BUS,
.instance_size = sizeof(PXBBus),
.class_init = pxb_bus_class_init,
};
static const char *pxb_host_root_bus_path(PCIHostState *host_bridge,
PCIBus *rootbus)
{
PXBBus *bus = PXB_BUS(rootbus);
snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
return bus->bus_path;
}
static void pxb_host_class_init(ObjectClass *class, void *data)
{
DeviceClass *dc = DEVICE_CLASS(class);
PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);
dc->fw_name = "pci";
hc->root_bus_path = pxb_host_root_bus_path;
}
static const TypeInfo pxb_host_info = {
.name = TYPE_PXB_HOST,
.parent = TYPE_PCI_HOST_BRIDGE,
.class_init = pxb_host_class_init,
};
/*
* Registers the PXB bus as a child of the i440fx root bus.
*
* Returns 0 on successs, -1 if i440fx host was not
* found or the bus number is already in use.
*/
static int pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus)
{
PCIBus *bus = dev->bus;
int pxb_bus_num = pci_bus_num(pxb_bus);
if (bus->parent_dev) {
error_report("PXB devices can be attached only to root bus.");
return -1;
}
QLIST_FOREACH(bus, &bus->child, sibling) {
if (pci_bus_num(bus) == pxb_bus_num) {
error_report("Bus %d is already in use.", pxb_bus_num);
return -1;
}
}
QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling);
return 0;
}
static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
{
PCIDevice *pxb = pci_dev->bus->parent_dev;
/*
* The bios does not index the pxb slot number when
* it computes the IRQ because it resides on bus 0
* and not on the current bus.
* However QEMU routes the irq through bus 0 and adds
* the pxb slot to the IRQ computation of the PXB
* device.
*
* Synchronize between bios and QEMU by canceling
* pxb's effect.
*/
return pin - PCI_SLOT(pxb->devfn);
}
static int pxb_dev_initfn(PCIDevice *dev)
{
PXBDev *pxb = PXB_DEV(dev);
DeviceState *ds, *bds;
PCIBus *bus;
const char *dev_name = NULL;
if (dev->qdev.id && *dev->qdev.id) {
dev_name = dev->qdev.id;
}
ds = qdev_create(NULL, TYPE_PXB_HOST);
bus = pci_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
bus->parent_dev = dev;
bus->address_space_mem = dev->bus->address_space_mem;
bus->address_space_io = dev->bus->address_space_io;
bus->map_irq = pxb_map_irq_fn;
bds = qdev_create(BUS(bus), "pci-bridge");
bds->id = dev_name;
qdev_prop_set_uint8(bds, "chassis_nr", pxb->bus_nr);
PCI_HOST_BRIDGE(ds)->bus = bus;
if (pxb_register_bus(dev, bus)) {
return -EINVAL;
}
qdev_init_nofail(ds);
qdev_init_nofail(bds);
pci_word_test_and_set_mask(dev->config + PCI_STATUS,
PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
return 0;
}
static Property pxb_dev_properties[] = {
/* Note: 0 is not a legal a PXB bus number. */
DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void pxb_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->init = pxb_dev_initfn;
k->vendor_id = PCI_VENDOR_ID_REDHAT;
k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
k->class_id = PCI_CLASS_BRIDGE_HOST;
dc->desc = "PCI Expander Bridge";
dc->props = pxb_dev_properties;
}
static const TypeInfo pxb_dev_info = {
.name = TYPE_PXB_DEVICE,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PXBDev),
.class_init = pxb_dev_class_init,
};
static void pxb_register_types(void)
{
type_register_static(&pxb_bus_info);
type_register_static(&pxb_host_info);
type_register_static(&pxb_dev_info);
}
type_init(pxb_register_types)
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