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