/* * 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 "qemu/osdep.h" #include "qapi/error.h" #include "hw/pci/pci.h" #include "hw/pci/pci_bus.h" #include "hw/pci/pci_host.h" #include "hw/pci/pci_bridge.h" #include "hw/i386/pc.h" #include "qemu/range.h" #include "qemu/error-report.h" #include "sysemu/numa.h" #define TYPE_PXB_BUS "pxb-bus" #define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS) #define TYPE_PXB_PCIE_BUS "pxb-pcie-bus" #define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_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) #define TYPE_PXB_PCIE_DEVICE "pxb-pcie" #define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE) typedef struct PXBDev { /*< private >*/ PCIDevice parent_obj; /*< public >*/ uint8_t bus_nr; uint16_t numa_node; } PXBDev; static PXBDev *convert_to_pxb(PCIDevice *dev) { return pci_bus_is_express(dev->bus) ? PXB_PCIE_DEV(dev) : PXB_DEV(dev); } static GList *pxb_dev_list; #define TYPE_PXB_HOST "pxb-host" static int pxb_bus_num(PCIBus *bus) { PXBDev *pxb = convert_to_pxb(bus->parent_dev); return pxb->bus_nr; } static bool pxb_is_root(PCIBus *bus) { return true; /* by definition */ } static uint16_t pxb_bus_numa_node(PCIBus *bus) { PXBDev *pxb = convert_to_pxb(bus->parent_dev); return pxb->numa_node; } 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; pbc->numa_node = pxb_bus_numa_node; } 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 TypeInfo pxb_pcie_bus_info = { .name = TYPE_PXB_PCIE_BUS, .parent = TYPE_PCIE_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 = pci_bus_is_express(rootbus) ? PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus); snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus)); return bus->bus_path; } static char *pxb_host_ofw_unit_address(const SysBusDevice *dev) { const PCIHostState *pxb_host; const PCIBus *pxb_bus; const PXBDev *pxb_dev; int position; const DeviceState *pxb_dev_base; const PCIHostState *main_host; const SysBusDevice *main_host_sbd; pxb_host = PCI_HOST_BRIDGE(dev); pxb_bus = pxb_host->bus; pxb_dev = convert_to_pxb(pxb_bus->parent_dev); position = g_list_index(pxb_dev_list, pxb_dev); assert(position >= 0); pxb_dev_base = DEVICE(pxb_dev); main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent); main_host_sbd = SYS_BUS_DEVICE(main_host); if (main_host_sbd->num_mmio > 0) { return g_strdup_printf(TARGET_FMT_plx ",%x", main_host_sbd->mmio[0].addr, position + 1); } if (main_host_sbd->num_pio > 0) { return g_strdup_printf("i%04x,%x", main_host_sbd->pio[0], position + 1); } return NULL; } static void pxb_host_class_init(ObjectClass *class, void *data) { DeviceClass *dc = DEVICE_CLASS(class); SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class); PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class); dc->fw_name = "pci"; /* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */ dc->cannot_instantiate_with_device_add_yet = true; sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address; 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 pci host root bus. */ static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp) { PCIBus *bus = dev->bus; int pxb_bus_num = pci_bus_num(pxb_bus); if (bus->parent_dev) { error_setg(errp, "PXB devices can be attached only to root bus"); return; } QLIST_FOREACH(bus, &bus->child, sibling) { if (pci_bus_num(bus) == pxb_bus_num) { error_setg(errp, "Bus %d is already in use", pxb_bus_num); return; } } QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling); } 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 gint pxb_compare(gconstpointer a, gconstpointer b) { const PXBDev *pxb_a = a, *pxb_b = b; return pxb_a->bus_nr < pxb_b->bus_nr ? -1 : pxb_a->bus_nr > pxb_b->bus_nr ? 1 : 0; } static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp) { PXBDev *pxb = convert_to_pxb(dev); DeviceState *ds, *bds = NULL; PCIBus *bus; const char *dev_name = NULL; Error *local_err = NULL; if (pxb->numa_node != NUMA_NODE_UNASSIGNED && pxb->numa_node >= nb_numa_nodes) { error_setg(errp, "Illegal numa node %d", pxb->numa_node); return; } if (dev->qdev.id && *dev->qdev.id) { dev_name = dev->qdev.id; } ds = qdev_create(NULL, TYPE_PXB_HOST); if (pcie) { bus = pci_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); } else { bus = pci_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS); bds = qdev_create(BUS(bus), "pci-bridge"); bds->id = dev_name; qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr); qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false); } 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; PCI_HOST_BRIDGE(ds)->bus = bus; pxb_register_bus(dev, bus, &local_err); if (local_err) { error_propagate(errp, local_err); goto err_register_bus; } qdev_init_nofail(ds); if (bds) { 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); pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare); return; err_register_bus: object_unref(OBJECT(bds)); object_unparent(OBJECT(bus)); object_unref(OBJECT(ds)); } static void pxb_dev_realize(PCIDevice *dev, Error **errp) { if (pci_bus_is_express(dev->bus)) { error_setg(errp, "pxb devices cannot reside on a PCIe bus"); return; } pxb_dev_realize_common(dev, false, errp); } static void pxb_dev_exitfn(PCIDevice *pci_dev) { PXBDev *pxb = convert_to_pxb(pci_dev); pxb_dev_list = g_list_remove(pxb_dev_list, pxb); } static Property pxb_dev_properties[] = { /* Note: 0 is not a legal PXB bus number. */ DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0), DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED), 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->realize = pxb_dev_realize; k->exit = pxb_dev_exitfn; 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; dc->hotpluggable = false; set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); } 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_pcie_dev_realize(PCIDevice *dev, Error **errp) { if (!pci_bus_is_express(dev->bus)) { error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus"); return; } pxb_dev_realize_common(dev, true, errp); } static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); k->realize = pxb_pcie_dev_realize; k->exit = pxb_dev_exitfn; k->vendor_id = PCI_VENDOR_ID_REDHAT; k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE; k->class_id = PCI_CLASS_BRIDGE_HOST; dc->desc = "PCI Express Expander Bridge"; dc->props = pxb_dev_properties; dc->hotpluggable = false; set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); } static const TypeInfo pxb_pcie_dev_info = { .name = TYPE_PXB_PCIE_DEVICE, .parent = TYPE_PCI_DEVICE, .instance_size = sizeof(PXBDev), .class_init = pxb_pcie_dev_class_init, }; static void pxb_register_types(void) { type_register_static(&pxb_bus_info); type_register_static(&pxb_pcie_bus_info); type_register_static(&pxb_host_info); type_register_static(&pxb_dev_info); type_register_static(&pxb_pcie_dev_info); } type_init(pxb_register_types)