/* * IOAPIC/IOxAPIC/IOSAPIC driver * * Copyright (C) 2009 Fujitsu Limited. * (c) Copyright 2009 Hewlett-Packard Development Company, L.P. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ /* * This driver manages PCI I/O APICs added by hotplug after boot. We try to * claim all I/O APIC PCI devices, but those present at boot were registered * when we parsed the ACPI MADT, so we'll fail when we try to re-register * them. */ #include <linux/pci.h> #include <linux/module.h> #include <linux/acpi.h> #include <linux/slab.h> struct ioapic { acpi_handle handle; u32 gsi_base; }; static int ioapic_probe(struct pci_dev *dev, const struct pci_device_id *ent) { acpi_handle handle; acpi_status status; unsigned long long gsb; struct ioapic *ioapic; int ret; char *type; struct resource *res; handle = ACPI_HANDLE(&dev->dev); if (!handle) return -EINVAL; status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); if (ACPI_FAILURE(status)) return -EINVAL; /* * The previous code in acpiphp evaluated _MAT if _GSB failed, but * ACPI spec 4.0 sec 6.2.2 requires _GSB for hot-pluggable I/O APICs. */ ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL); if (!ioapic) return -ENOMEM; ioapic->handle = handle; ioapic->gsi_base = (u32) gsb; if (dev->class == PCI_CLASS_SYSTEM_PIC_IOAPIC) type = "IOAPIC"; else type = "IOxAPIC"; ret = pci_enable_device(dev); if (ret < 0) goto exit_free; pci_set_master(dev); if (pci_request_region(dev, 0, type)) goto exit_disable; res = &dev->resource[0]; if (acpi_register_ioapic(ioapic->handle, res->start, ioapic->gsi_base)) goto exit_release; pci_set_drvdata(dev, ioapic); dev_info(&dev->dev, "%s at %pR, GSI %u\n", type, res, ioapic->gsi_base); return 0; exit_release: pci_release_region(dev, 0); exit_disable: pci_disable_device(dev); exit_free: kfree(ioapic); return -ENODEV; } static void ioapic_remove(struct pci_dev *dev) { struct ioapic *ioapic = pci_get_drvdata(dev); acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base); pci_release_region(dev, 0); pci_disable_device(dev); kfree(ioapic); } static DEFINE_PCI_DEVICE_TABLE(ioapic_devices) = { { PCI_DEVICE_CLASS(PCI_CLASS_SYSTEM_PIC_IOAPIC, ~0) }, { PCI_DEVICE_CLASS(PCI_CLASS_SYSTEM_PIC_IOXAPIC, ~0) }, { } }; MODULE_DEVICE_TABLE(pci, ioapic_devices); static struct pci_driver ioapic_driver = { .name = "ioapic", .id_table = ioapic_devices, .probe = ioapic_probe, .remove = ioapic_remove, }; static int __init ioapic_init(void) { return pci_register_driver(&ioapic_driver); } module_init(ioapic_init); MODULE_LICENSE("GPL");