375 lines
10 KiB
C
375 lines
10 KiB
C
/*
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* PCI Expander Bridge Device Emulation
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*
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* Copyright (C) 2015 Red Hat Inc
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*
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* Authors:
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* Marcel Apfelbaum <marcel@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/pci/pci.h"
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#include "hw/pci/pci_bus.h"
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#include "hw/pci/pci_host.h"
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#include "hw/qdev-properties.h"
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#include "hw/pci/pci_bridge.h"
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#include "qemu/range.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "sysemu/numa.h"
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#include "hw/boards.h"
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#define TYPE_PXB_BUS "pxb-bus"
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#define PXB_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_BUS)
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#define TYPE_PXB_PCIE_BUS "pxb-pcie-bus"
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#define PXB_PCIE_BUS(obj) OBJECT_CHECK(PXBBus, (obj), TYPE_PXB_PCIE_BUS)
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typedef struct PXBBus {
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/*< private >*/
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PCIBus parent_obj;
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/*< public >*/
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char bus_path[8];
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} PXBBus;
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#define TYPE_PXB_DEVICE "pxb"
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#define PXB_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_DEVICE)
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#define TYPE_PXB_PCIE_DEVICE "pxb-pcie"
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#define PXB_PCIE_DEV(obj) OBJECT_CHECK(PXBDev, (obj), TYPE_PXB_PCIE_DEVICE)
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typedef struct PXBDev {
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/*< private >*/
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PCIDevice parent_obj;
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/*< public >*/
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uint8_t bus_nr;
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uint16_t numa_node;
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} PXBDev;
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static PXBDev *convert_to_pxb(PCIDevice *dev)
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{
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return pci_bus_is_express(pci_get_bus(dev))
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? PXB_PCIE_DEV(dev) : PXB_DEV(dev);
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}
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static GList *pxb_dev_list;
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#define TYPE_PXB_HOST "pxb-host"
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static int pxb_bus_num(PCIBus *bus)
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{
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PXBDev *pxb = convert_to_pxb(bus->parent_dev);
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return pxb->bus_nr;
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}
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static uint16_t pxb_bus_numa_node(PCIBus *bus)
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{
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PXBDev *pxb = convert_to_pxb(bus->parent_dev);
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return pxb->numa_node;
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}
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static void pxb_bus_class_init(ObjectClass *class, void *data)
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{
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PCIBusClass *pbc = PCI_BUS_CLASS(class);
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pbc->bus_num = pxb_bus_num;
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pbc->numa_node = pxb_bus_numa_node;
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}
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static const TypeInfo pxb_bus_info = {
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.name = TYPE_PXB_BUS,
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.parent = TYPE_PCI_BUS,
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.instance_size = sizeof(PXBBus),
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.class_init = pxb_bus_class_init,
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};
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static const TypeInfo pxb_pcie_bus_info = {
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.name = TYPE_PXB_PCIE_BUS,
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.parent = TYPE_PCIE_BUS,
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.instance_size = sizeof(PXBBus),
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.class_init = pxb_bus_class_init,
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};
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static const char *pxb_host_root_bus_path(PCIHostState *host_bridge,
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PCIBus *rootbus)
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{
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PXBBus *bus = pci_bus_is_express(rootbus) ?
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PXB_PCIE_BUS(rootbus) : PXB_BUS(rootbus);
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snprintf(bus->bus_path, 8, "0000:%02x", pxb_bus_num(rootbus));
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return bus->bus_path;
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}
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static char *pxb_host_ofw_unit_address(const SysBusDevice *dev)
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{
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const PCIHostState *pxb_host;
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const PCIBus *pxb_bus;
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const PXBDev *pxb_dev;
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int position;
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const DeviceState *pxb_dev_base;
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const PCIHostState *main_host;
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const SysBusDevice *main_host_sbd;
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pxb_host = PCI_HOST_BRIDGE(dev);
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pxb_bus = pxb_host->bus;
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pxb_dev = convert_to_pxb(pxb_bus->parent_dev);
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position = g_list_index(pxb_dev_list, pxb_dev);
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assert(position >= 0);
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pxb_dev_base = DEVICE(pxb_dev);
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main_host = PCI_HOST_BRIDGE(pxb_dev_base->parent_bus->parent);
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main_host_sbd = SYS_BUS_DEVICE(main_host);
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if (main_host_sbd->num_mmio > 0) {
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return g_strdup_printf(TARGET_FMT_plx ",%x",
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main_host_sbd->mmio[0].addr, position + 1);
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}
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if (main_host_sbd->num_pio > 0) {
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return g_strdup_printf("i%04x,%x",
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main_host_sbd->pio[0], position + 1);
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}
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return NULL;
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}
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static void pxb_host_class_init(ObjectClass *class, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(class);
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SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(class);
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PCIHostBridgeClass *hc = PCI_HOST_BRIDGE_CLASS(class);
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dc->fw_name = "pci";
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/* Reason: Internal part of the pxb/pxb-pcie device, not usable by itself */
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dc->user_creatable = false;
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sbc->explicit_ofw_unit_address = pxb_host_ofw_unit_address;
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hc->root_bus_path = pxb_host_root_bus_path;
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}
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static const TypeInfo pxb_host_info = {
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.name = TYPE_PXB_HOST,
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.parent = TYPE_PCI_HOST_BRIDGE,
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.class_init = pxb_host_class_init,
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};
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/*
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* Registers the PXB bus as a child of pci host root bus.
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*/
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static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp)
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{
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PCIBus *bus = pci_get_bus(dev);
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int pxb_bus_num = pci_bus_num(pxb_bus);
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if (bus->parent_dev) {
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error_setg(errp, "PXB devices can be attached only to root bus");
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return;
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}
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QLIST_FOREACH(bus, &bus->child, sibling) {
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if (pci_bus_num(bus) == pxb_bus_num) {
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error_setg(errp, "Bus %d is already in use", pxb_bus_num);
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return;
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}
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}
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QLIST_INSERT_HEAD(&pci_get_bus(dev)->child, pxb_bus, sibling);
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}
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static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
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{
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PCIDevice *pxb = pci_get_bus(pci_dev)->parent_dev;
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/*
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* The bios does not index the pxb slot number when
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* it computes the IRQ because it resides on bus 0
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* and not on the current bus.
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* However QEMU routes the irq through bus 0 and adds
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* the pxb slot to the IRQ computation of the PXB
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* device.
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*
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* Synchronize between bios and QEMU by canceling
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* pxb's effect.
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*/
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return pin - PCI_SLOT(pxb->devfn);
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}
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static gint pxb_compare(gconstpointer a, gconstpointer b)
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{
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const PXBDev *pxb_a = a, *pxb_b = b;
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return pxb_a->bus_nr < pxb_b->bus_nr ? -1 :
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pxb_a->bus_nr > pxb_b->bus_nr ? 1 :
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0;
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}
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static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
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{
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PXBDev *pxb = convert_to_pxb(dev);
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DeviceState *ds, *bds = NULL;
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PCIBus *bus;
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const char *dev_name = NULL;
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Error *local_err = NULL;
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MachineState *ms = MACHINE(qdev_get_machine());
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if (ms->numa_state == NULL) {
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error_setg(errp, "NUMA is not supported by this machine-type");
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return;
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}
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if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
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pxb->numa_node >= ms->numa_state->num_nodes) {
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error_setg(errp, "Illegal numa node %d", pxb->numa_node);
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return;
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}
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if (dev->qdev.id && *dev->qdev.id) {
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dev_name = dev->qdev.id;
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}
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ds = qdev_new(TYPE_PXB_HOST);
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if (pcie) {
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bus = pci_root_bus_new(ds, dev_name, NULL, NULL, 0, TYPE_PXB_PCIE_BUS);
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} else {
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bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
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bds = qdev_new("pci-bridge");
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bds->id = dev_name;
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qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
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qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
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}
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bus->parent_dev = dev;
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bus->address_space_mem = pci_get_bus(dev)->address_space_mem;
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bus->address_space_io = pci_get_bus(dev)->address_space_io;
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bus->map_irq = pxb_map_irq_fn;
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PCI_HOST_BRIDGE(ds)->bus = bus;
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pxb_register_bus(dev, bus, &local_err);
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if (local_err) {
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error_propagate(errp, local_err);
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goto err_register_bus;
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}
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sysbus_realize_and_unref(SYS_BUS_DEVICE(ds), &error_fatal);
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if (bds) {
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qdev_realize_and_unref(bds, &bus->qbus, &error_fatal);
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}
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pci_word_test_and_set_mask(dev->config + PCI_STATUS,
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PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK);
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pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
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pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
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return;
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err_register_bus:
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object_unref(OBJECT(bds));
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object_unparent(OBJECT(bus));
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object_unref(OBJECT(ds));
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}
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static void pxb_dev_realize(PCIDevice *dev, Error **errp)
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{
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if (pci_bus_is_express(pci_get_bus(dev))) {
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error_setg(errp, "pxb devices cannot reside on a PCIe bus");
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return;
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}
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pxb_dev_realize_common(dev, false, errp);
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}
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static void pxb_dev_exitfn(PCIDevice *pci_dev)
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{
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PXBDev *pxb = convert_to_pxb(pci_dev);
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pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
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}
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static Property pxb_dev_properties[] = {
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/* Note: 0 is not a legal PXB bus number. */
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DEFINE_PROP_UINT8("bus_nr", PXBDev, bus_nr, 0),
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DEFINE_PROP_UINT16("numa_node", PXBDev, numa_node, NUMA_NODE_UNASSIGNED),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void pxb_dev_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
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k->realize = pxb_dev_realize;
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k->exit = pxb_dev_exitfn;
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k->vendor_id = PCI_VENDOR_ID_REDHAT;
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k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
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k->class_id = PCI_CLASS_BRIDGE_HOST;
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dc->desc = "PCI Expander Bridge";
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device_class_set_props(dc, pxb_dev_properties);
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dc->hotpluggable = false;
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set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
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}
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static const TypeInfo pxb_dev_info = {
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.name = TYPE_PXB_DEVICE,
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.parent = TYPE_PCI_DEVICE,
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.instance_size = sizeof(PXBDev),
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.class_init = pxb_dev_class_init,
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.interfaces = (InterfaceInfo[]) {
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{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
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{ },
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},
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};
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static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp)
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{
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if (!pci_bus_is_express(pci_get_bus(dev))) {
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error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus");
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return;
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}
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pxb_dev_realize_common(dev, true, errp);
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}
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static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
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k->realize = pxb_pcie_dev_realize;
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k->exit = pxb_dev_exitfn;
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k->vendor_id = PCI_VENDOR_ID_REDHAT;
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k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
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k->class_id = PCI_CLASS_BRIDGE_HOST;
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dc->desc = "PCI Express Expander Bridge";
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device_class_set_props(dc, pxb_dev_properties);
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dc->hotpluggable = false;
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set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
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}
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static const TypeInfo pxb_pcie_dev_info = {
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.name = TYPE_PXB_PCIE_DEVICE,
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.parent = TYPE_PCI_DEVICE,
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.instance_size = sizeof(PXBDev),
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.class_init = pxb_pcie_dev_class_init,
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.interfaces = (InterfaceInfo[]) {
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{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
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{ },
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},
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};
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static void pxb_register_types(void)
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{
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type_register_static(&pxb_bus_info);
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type_register_static(&pxb_pcie_bus_info);
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type_register_static(&pxb_host_info);
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type_register_static(&pxb_dev_info);
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type_register_static(&pxb_pcie_dev_info);
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}
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type_init(pxb_register_types)
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