--- /dev/null
+/*
+ * 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 "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
+#include "hw/pci/pci_host.h"
+#include "hw/pci/pci_bus.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)
+
+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)
+
+typedef struct PXBDev {
+ /*< private >*/
+ PCIDevice parent_obj;
+ /*< public >*/
+
+ uint8_t bus_nr;
+ uint16_t numa_node;
+} PXBDev;
+
+static GList *pxb_dev_list;
+
+#define TYPE_PXB_HOST "pxb-host"
+
+static int pxb_bus_num(PCIBus *bus)
+{
+ PXBDev *pxb = PXB_DEV(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 = PXB_DEV(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 char *pxb_host_root_bus_path(PCIHostState *host_bridge,
+ PCIBus *rootbus)
+{
+ PXBBus *bus = 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 = PXB_DEV(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";
+ 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 the i440fx root bus.
+ *
+ * Returns 0 on successs, -1 if i440fx host was not
+ * found or the bus number is already in use.
+ */
+static int pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus)
+{
+ PCIBus *bus = dev->bus;
+ int pxb_bus_num = pci_bus_num(pxb_bus);
+
+ if (bus->parent_dev) {
+ error_report("PXB devices can be attached only to root bus.");
+ return -1;
+ }
+
+ QLIST_FOREACH(bus, &bus->child, sibling) {
+ if (pci_bus_num(bus) == pxb_bus_num) {
+ error_report("Bus %d is already in use.", pxb_bus_num);
+ return -1;
+ }
+ }
+ QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling);
+
+ return 0;
+}
+
+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 int pxb_dev_initfn(PCIDevice *dev)
+{
+ PXBDev *pxb = PXB_DEV(dev);
+ DeviceState *ds, *bds;
+ PCIBus *bus;
+ const char *dev_name = NULL;
+
+ if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
+ pxb->numa_node >= nb_numa_nodes) {
+ error_report("Illegal numa node %d.", pxb->numa_node);
+ return -EINVAL;
+ }
+
+ if (dev->qdev.id && *dev->qdev.id) {
+ dev_name = dev->qdev.id;
+ }
+
+ ds = qdev_create(NULL, TYPE_PXB_HOST);
+ bus = pci_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
+
+ 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;
+
+ 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);
+
+ PCI_HOST_BRIDGE(ds)->bus = bus;
+
+ if (pxb_register_bus(dev, bus)) {
+ return -EINVAL;
+ }
+
+ qdev_init_nofail(ds);
+ 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 0;
+}
+
+static void pxb_dev_exitfn(PCIDevice *pci_dev)
+{
+ PXBDev *pxb = PXB_DEV(pci_dev);
+
+ pxb_dev_list = g_list_remove(pxb_dev_list, pxb);
+}
+
+static Property pxb_dev_properties[] = {
+ /* Note: 0 is not a legal a 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->init = pxb_dev_initfn;
+ 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;
+}
+
+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_register_types(void)
+{
+ type_register_static(&pxb_bus_info);
+ type_register_static(&pxb_host_info);
+ type_register_static(&pxb_dev_info);
+}
+
+type_init(pxb_register_types)
Code Review / kvmfornfv.git / blobdiff