diff options
Diffstat (limited to 'hw/pci-bridge/pci_expander_bridge.c')
| -rw-r--r-- | hw/pci-bridge/pci_expander_bridge.c | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c new file mode 100644 index 000000000..10e6e7c2a --- /dev/null +++ b/hw/pci-bridge/pci_expander_bridge.c @@ -0,0 +1,385 @@ +/* + * 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/qdev-properties.h" +#include "hw/pci/pci_bridge.h" +#include "qemu/range.h" +#include "qemu/error-report.h" +#include "qemu/module.h" +#include "sysemu/numa.h" +#include "hw/boards.h" +#include "qom/object.h" + +#define TYPE_PXB_BUS "pxb-bus" +typedef struct PXBBus PXBBus; +DECLARE_INSTANCE_CHECKER(PXBBus, PXB_BUS, + TYPE_PXB_BUS) + +#define TYPE_PXB_PCIE_BUS "pxb-pcie-bus" +DECLARE_INSTANCE_CHECKER(PXBBus, PXB_PCIE_BUS, + TYPE_PXB_PCIE_BUS) + +struct PXBBus { + /*< private >*/ + PCIBus parent_obj; + /*< public >*/ + + char bus_path[8]; +}; + +#define TYPE_PXB_DEVICE "pxb" +typedef struct PXBDev PXBDev; +DECLARE_INSTANCE_CHECKER(PXBDev, PXB_DEV, + TYPE_PXB_DEVICE) + +#define TYPE_PXB_PCIE_DEVICE "pxb-pcie" +DECLARE_INSTANCE_CHECKER(PXBDev, PXB_PCIE_DEV, + TYPE_PXB_PCIE_DEVICE) + +struct PXBDev { + /*< private >*/ + PCIDevice parent_obj; + /*< public >*/ + + uint8_t bus_nr; + uint16_t numa_node; + bool bypass_iommu; +}; + +static PXBDev *convert_to_pxb(PCIDevice *dev) +{ + return pci_bus_is_express(pci_get_bus(dev)) + ? 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 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->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->user_creatable = false; + 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 = pci_get_bus(dev); + 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(&pci_get_bus(dev)->child, pxb_bus, sibling); +} + +static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin) +{ + PCIDevice *pxb = pci_get_bus(pci_dev)->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; + MachineState *ms = MACHINE(qdev_get_machine()); + + if (ms->numa_state == NULL) { + error_setg(errp, "NUMA is not supported by this machine-type"); + return; + } + + if (pxb->numa_node != NUMA_NODE_UNASSIGNED && + pxb->numa_node >= ms->numa_state->num_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_new(TYPE_PXB_HOST); + if (pcie) { + bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS); + } else { + bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS); + bds = qdev_new("pci-bridge"); + bds->id = g_strdup(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 = pci_get_bus(dev)->address_space_mem; + bus->address_space_io = pci_get_bus(dev)->address_space_io; + bus->map_irq = pxb_map_irq_fn; + + PCI_HOST_BRIDGE(ds)->bus = bus; + PCI_HOST_BRIDGE(ds)->bypass_iommu = pxb->bypass_iommu; + + pxb_register_bus(dev, bus, &local_err); + if (local_err) { + error_propagate(errp, local_err); + goto err_register_bus; + } + + sysbus_realize_and_unref(SYS_BUS_DEVICE(ds), &error_fatal); + if (bds) { + qdev_realize_and_unref(bds, &bus->qbus, &error_fatal); + } + + 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(pci_get_bus(dev))) { + 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_BOOL("bypass_iommu", PXBDev, bypass_iommu, false), + 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"; + device_class_set_props(dc, 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, + .interfaces = (InterfaceInfo[]) { + { INTERFACE_CONVENTIONAL_PCI_DEVICE }, + { }, + }, +}; + +static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp) +{ + if (!pci_bus_is_express(pci_get_bus(dev))) { + 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"; + device_class_set_props(dc, 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, + .interfaces = (InterfaceInfo[]) { + { INTERFACE_CONVENTIONAL_PCI_DEVICE }, + { }, + }, +}; + +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) |