/* * Standard PCI Bridge Device * * Copyright (c) 2011 Red Hat Inc. Author: Michael S. Tsirkin <mst@redhat.com> * * http://www.pcisig.com/specifications/conventional/pci_to_pci_bridge_architecture/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, see <http://www.gnu.org/licenses/>. */ #include "qemu/osdep.h" #include "qapi/error.h" #include "qemu/module.h" #include "hw/pci/pci_bridge.h" #include "hw/pci/pci_ids.h" #include "hw/pci/msi.h" #include "hw/pci/shpc.h" #include "hw/pci/slotid_cap.h" #include "hw/qdev-properties.h" #include "exec/memory.h" #include "hw/pci/pci_bus.h" #include "hw/hotplug.h" #define TYPE_PCI_BRIDGE_DEV "pci-bridge" #define TYPE_PCI_BRIDGE_SEAT_DEV "pci-bridge-seat" #define PCI_BRIDGE_DEV(obj) \ OBJECT_CHECK(PCIBridgeDev, (obj), TYPE_PCI_BRIDGE_DEV) struct PCIBridgeDev { /*< private >*/ PCIBridge parent_obj; /*< public >*/ MemoryRegion bar; uint8_t chassis_nr; #define PCI_BRIDGE_DEV_F_SHPC_REQ 0 uint32_t flags; OnOffAuto msi; /* additional resources to reserve */ PCIResReserve res_reserve; }; typedef struct PCIBridgeDev PCIBridgeDev; static void pci_bridge_dev_realize(PCIDevice *dev, Error **errp) { PCIBridge *br = PCI_BRIDGE(dev); PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); int err; Error *local_err = NULL; pci_bridge_initfn(dev, TYPE_PCI_BUS); if (bridge_dev->flags & (1 << PCI_BRIDGE_DEV_F_SHPC_REQ)) { dev->config[PCI_INTERRUPT_PIN] = 0x1; memory_region_init(&bridge_dev->bar, OBJECT(dev), "shpc-bar", shpc_bar_size(dev)); err = shpc_init(dev, &br->sec_bus, &bridge_dev->bar, 0, errp); if (err) { goto shpc_error; } } else { /* MSI is not applicable without SHPC */ bridge_dev->msi = ON_OFF_AUTO_OFF; } err = slotid_cap_init(dev, 0, bridge_dev->chassis_nr, 0, errp); if (err) { goto slotid_error; } if (bridge_dev->msi != ON_OFF_AUTO_OFF) { /* it means SHPC exists, because MSI is needed by SHPC */ err = msi_init(dev, 0, 1, true, true, &local_err); /* Any error other than -ENOTSUP(board's MSI support is broken) * is a programming error */ assert(!err || err == -ENOTSUP); if (err && bridge_dev->msi == ON_OFF_AUTO_ON) { /* Can't satisfy user's explicit msi=on request, fail */ error_append_hint(&local_err, "You have to use msi=auto (default) " "or msi=off with this machine type.\n"); error_propagate(errp, local_err); goto msi_error; } assert(!local_err || bridge_dev->msi == ON_OFF_AUTO_AUTO); /* With msi=auto, we fall back to MSI off silently */ error_free(local_err); } err = pci_bridge_qemu_reserve_cap_init(dev, 0, bridge_dev->res_reserve, errp); if (err) { goto cap_error; } if (shpc_present(dev)) { /* TODO: spec recommends using 64 bit prefetcheable BAR. * Check whether that works well. */ pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64, &bridge_dev->bar); } return; cap_error: msi_uninit(dev); msi_error: slotid_cap_cleanup(dev); slotid_error: if (shpc_present(dev)) { shpc_cleanup(dev, &bridge_dev->bar); } shpc_error: pci_bridge_exitfn(dev); } static void pci_bridge_dev_exitfn(PCIDevice *dev) { PCIBridgeDev *bridge_dev = PCI_BRIDGE_DEV(dev); pci_del_capability(dev, PCI_CAP_ID_VNDR, sizeof(PCIBridgeQemuCap)); if (msi_present(dev)) { msi_uninit(dev); } slotid_cap_cleanup(dev); if (shpc_present(dev)) { shpc_cleanup(dev, &bridge_dev->bar); } pci_bridge_exitfn(dev); } static void pci_bridge_dev_instance_finalize(Object *obj) { /* this function is idempotent and handles (PCIDevice.shpc == NULL) */ shpc_free(PCI_DEVICE(obj)); } static void pci_bridge_dev_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); } if (shpc_present(d)) { shpc_cap_write_config(d, address, val, len); } } static void qdev_pci_bridge_dev_reset(DeviceState *qdev) { PCIDevice *dev = PCI_DEVICE(qdev); pci_bridge_reset(qdev); if (shpc_present(dev)) { shpc_reset(dev); } } static Property pci_bridge_dev_properties[] = { /* Note: 0 is not a legal chassis number. */ DEFINE_PROP_UINT8(PCI_BRIDGE_DEV_PROP_CHASSIS_NR, PCIBridgeDev, chassis_nr, 0), DEFINE_PROP_ON_OFF_AUTO(PCI_BRIDGE_DEV_PROP_MSI, PCIBridgeDev, msi, ON_OFF_AUTO_AUTO), DEFINE_PROP_BIT(PCI_BRIDGE_DEV_PROP_SHPC, PCIBridgeDev, flags, PCI_BRIDGE_DEV_F_SHPC_REQ, true), DEFINE_PROP_UINT32("bus-reserve", PCIBridgeDev, res_reserve.bus, -1), DEFINE_PROP_SIZE("io-reserve", PCIBridgeDev, res_reserve.io, -1), DEFINE_PROP_SIZE("mem-reserve", PCIBridgeDev, res_reserve.mem_non_pref, -1), DEFINE_PROP_SIZE("pref32-reserve", PCIBridgeDev, res_reserve.mem_pref_32, -1), DEFINE_PROP_SIZE("pref64-reserve", PCIBridgeDev, res_reserve.mem_pref_64, -1), DEFINE_PROP_END_OF_LIST(), }; static bool pci_device_shpc_present(void *opaque, int version_id) { PCIDevice *dev = opaque; return shpc_present(dev); } static const VMStateDescription pci_bridge_dev_vmstate = { .name = "pci_bridge", .priority = MIG_PRI_PCI_BUS, .fields = (VMStateField[]) { VMSTATE_PCI_DEVICE(parent_obj, PCIBridge), SHPC_VMSTATE(shpc, PCIDevice, pci_device_shpc_present), VMSTATE_END_OF_LIST() } }; void pci_bridge_dev_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); if (!shpc_present(pci_hotplug_dev)) { error_setg(errp, "standard hotplug controller has been disabled for " "this %s", object_get_typename(OBJECT(hotplug_dev))); return; } shpc_device_plug_cb(hotplug_dev, dev, errp); } void pci_bridge_dev_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); g_assert(shpc_present(pci_hotplug_dev)); shpc_device_unplug_cb(hotplug_dev, dev, errp); } void pci_bridge_dev_unplug_request_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { PCIDevice *pci_hotplug_dev = PCI_DEVICE(hotplug_dev); if (!shpc_present(pci_hotplug_dev)) { error_setg(errp, "standard hotplug controller has been disabled for " "this %s", object_get_typename(OBJECT(hotplug_dev))); return; } shpc_device_unplug_request_cb(hotplug_dev, dev, errp); } static void pci_bridge_dev_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); k->realize = pci_bridge_dev_realize; k->exit = pci_bridge_dev_exitfn; k->config_write = pci_bridge_dev_write_config; k->vendor_id = PCI_VENDOR_ID_REDHAT; k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE; k->class_id = PCI_CLASS_BRIDGE_PCI; k->is_bridge = true; dc->desc = "Standard PCI Bridge"; dc->reset = qdev_pci_bridge_dev_reset; dc->props = pci_bridge_dev_properties; dc->vmsd = &pci_bridge_dev_vmstate; 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 pci_bridge_dev_info = { .name = TYPE_PCI_BRIDGE_DEV, .parent = TYPE_PCI_BRIDGE, .instance_size = sizeof(PCIBridgeDev), .class_init = pci_bridge_dev_class_init, .instance_finalize = pci_bridge_dev_instance_finalize, .interfaces = (InterfaceInfo[]) { { TYPE_HOTPLUG_HANDLER }, { INTERFACE_CONVENTIONAL_PCI_DEVICE }, { } } }; /* * Multiseat bridge. Same as the standard pci bridge, only with a * different pci id, so we can match it easily in the guest for * automagic multiseat configuration. See docs/multiseat.txt for more. */ static void pci_bridge_dev_seat_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->device_id = PCI_DEVICE_ID_REDHAT_BRIDGE_SEAT; dc->desc = "Standard PCI Bridge (multiseat)"; } static const TypeInfo pci_bridge_dev_seat_info = { .name = TYPE_PCI_BRIDGE_SEAT_DEV, .parent = TYPE_PCI_BRIDGE_DEV, .instance_size = sizeof(PCIBridgeDev), .class_init = pci_bridge_dev_seat_class_init, }; static void pci_bridge_dev_register(void) { type_register_static(&pci_bridge_dev_info); type_register_static(&pci_bridge_dev_seat_info); } type_init(pci_bridge_dev_register);