qemu-e2k/hw/pci-bridge/pcie_pci_bridge.c

179 lines
4.9 KiB
C
Raw Normal View History

/*
* QEMU Generic PCIE-PCI Bridge
*
* Copyright (c) 2017 Aleksandr Bezzubikov
*
* 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 "qapi/error.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_bus.h"
#include "hw/pci/pci_bridge.h"
#include "hw/pci/msi.h"
#include "hw/pci/shpc.h"
#include "hw/pci/slotid_cap.h"
typedef struct PCIEPCIBridge {
/*< private >*/
PCIBridge parent_obj;
OnOffAuto msi;
MemoryRegion shpc_bar;
/*< public >*/
} PCIEPCIBridge;
#define TYPE_PCIE_PCI_BRIDGE_DEV "pcie-pci-bridge"
#define PCIE_PCI_BRIDGE_DEV(obj) \
OBJECT_CHECK(PCIEPCIBridge, (obj), TYPE_PCIE_PCI_BRIDGE_DEV)
static void pcie_pci_bridge_realize(PCIDevice *d, Error **errp)
{
PCIBridge *br = PCI_BRIDGE(d);
PCIEPCIBridge *pcie_br = PCIE_PCI_BRIDGE_DEV(d);
int rc, pos;
pci_bridge_initfn(d, TYPE_PCI_BUS);
d->config[PCI_INTERRUPT_PIN] = 0x1;
memory_region_init(&pcie_br->shpc_bar, OBJECT(d), "shpc-bar",
shpc_bar_size(d));
rc = shpc_init(d, &br->sec_bus, &pcie_br->shpc_bar, 0, errp);
if (rc) {
goto error;
}
rc = pcie_cap_init(d, 0, PCI_EXP_TYPE_PCI_BRIDGE, 0, errp);
if (rc < 0) {
goto cap_error;
}
pos = pci_add_capability(d, PCI_CAP_ID_PM, 0, PCI_PM_SIZEOF, errp);
if (pos < 0) {
goto pm_error;
}
d->exp.pm_cap = pos;
pci_set_word(d->config + pos + PCI_PM_PMC, 0x3);
pcie_cap_arifwd_init(d);
pcie_cap_deverr_init(d);
rc = pcie_aer_init(d, PCI_ERR_VER, 0x100, PCI_ERR_SIZEOF, errp);
if (rc < 0) {
goto aer_error;
}
Error *local_err = NULL;
if (pcie_br->msi != ON_OFF_AUTO_OFF) {
rc = msi_init(d, 0, 1, true, true, &local_err);
if (rc < 0) {
assert(rc == -ENOTSUP);
if (pcie_br->msi != ON_OFF_AUTO_ON) {
error_free(local_err);
} else {
/* failed to satisfy user's explicit request for MSI */
error_propagate(errp, local_err);
goto msi_error;
}
}
}
pci_register_bar(d, 0, PCI_BASE_ADDRESS_SPACE_MEMORY |
PCI_BASE_ADDRESS_MEM_TYPE_64, &pcie_br->shpc_bar);
return;
msi_error:
pcie_aer_exit(d);
aer_error:
pm_error:
pcie_cap_exit(d);
cap_error:
shpc_cleanup(d, &pcie_br->shpc_bar);
error:
pci_bridge_exitfn(d);
}
static void pcie_pci_bridge_exit(PCIDevice *d)
{
PCIEPCIBridge *bridge_dev = PCIE_PCI_BRIDGE_DEV(d);
pcie_cap_exit(d);
shpc_cleanup(d, &bridge_dev->shpc_bar);
pci_bridge_exitfn(d);
}
static void pcie_pci_bridge_reset(DeviceState *qdev)
{
PCIDevice *d = PCI_DEVICE(qdev);
pci_bridge_reset(qdev);
if (msi_present(d)) {
msi_reset(d);
}
shpc_reset(d);
}
static void pcie_pci_bridge_write_config(PCIDevice *d,
uint32_t address, uint32_t val, int len)
{
pci_bridge_write_config(d, address, val, len);
if (msi_present(d)) {
msi_write_config(d, address, val, len);
}
shpc_cap_write_config(d, address, val, len);
}
static Property pcie_pci_bridge_dev_properties[] = {
DEFINE_PROP_ON_OFF_AUTO("msi", PCIEPCIBridge, msi, ON_OFF_AUTO_AUTO),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription pcie_pci_bridge_dev_vmstate = {
.name = TYPE_PCIE_PCI_BRIDGE_DEV,
pci/bus: let it has higher migration priority In the past, we prioritized IOMMU migration so that we have such a priority order: IOMMU > PCI Devices When migrating a guest with both vIOMMU and a pcie-root-port, we'll always migrate vIOMMU first, since pci buses will be seen to have the same priority of general PCI devices. That's problematic. The thing is that PCI bus number information is stored in the root port, and that is needed by vIOMMU during post_load(), e.g., to figure out context entry for a device. If we don't have correct bus numbers for devices, we won't be able to recover device state of the DMAR memory regions, and things will be messed up. So let's boost the PCIe root ports to be even with higher priority: PCIe Root Port > IOMMU > PCI Devices A smoke test shows that this patch fixes bug 1538953. Also, apply this rule to all the PCI bus/bridge devices: ioh3420, xio3130_downstream, xio3130_upstream, pcie_pci_bridge, pci-pci bridge, i82801b11. I noted that we set pcie_pci_bridge_dev_vmstate twice. Clean that up together. CC: Alex Williamson <alex.williamson@redhat.com> CC: Marcel Apfelbaum <marcel@redhat.com> CC: Michael S. Tsirkin <mst@redhat.com> CC: Dr. David Alan Gilbert <dgilbert@redhat.com> CC: Juan Quintela <quintela@redhat.com> CC: Laurent Vivier <lvivier@redhat.com> Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1538953 Reported-by: Maxime Coquelin <maxime.coquelin@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2018-02-06 08:39:33 +01:00
.priority = MIG_PRI_PCI_BUS,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(parent_obj, PCIBridge),
SHPC_VMSTATE(shpc, PCIDevice, NULL),
VMSTATE_END_OF_LIST()
}
};
static void pcie_pci_bridge_class_init(ObjectClass *klass, void *data)
{
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
k->is_bridge = 1;
k->vendor_id = PCI_VENDOR_ID_REDHAT;
k->device_id = PCI_DEVICE_ID_REDHAT_PCIE_BRIDGE;
k->realize = pcie_pci_bridge_realize;
k->exit = pcie_pci_bridge_exit;
k->config_write = pcie_pci_bridge_write_config;
dc->vmsd = &pcie_pci_bridge_dev_vmstate;
dc->props = pcie_pci_bridge_dev_properties;
dc->reset = &pcie_pci_bridge_reset;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
hc->plug = pci_bridge_dev_plug_cb;
hc->unplug = pci_bridge_dev_unplug_cb;
hc->unplug_request = pci_bridge_dev_unplug_request_cb;
}
static const TypeInfo pcie_pci_bridge_info = {
.name = TYPE_PCIE_PCI_BRIDGE_DEV,
.parent = TYPE_PCI_BRIDGE,
.instance_size = sizeof(PCIEPCIBridge),
.class_init = pcie_pci_bridge_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ INTERFACE_PCIE_DEVICE },
{ },
}
};
static void pciepci_register(void)
{
type_register_static(&pcie_pci_bridge_info);
}
type_init(pciepci_register);