Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 1 | /* |
| 2 | * IOAPIC/IOxAPIC/IOSAPIC driver |
| 3 | * |
| 4 | * Copyright (C) 2009 Fujitsu Limited. |
| 5 | * (c) Copyright 2009 Hewlett-Packard Development Company, L.P. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * This driver manages PCI I/O APICs added by hotplug after boot. We try to |
| 14 | * claim all I/O APIC PCI devices, but those present at boot were registered |
| 15 | * when we parsed the ACPI MADT, so we'll fail when we try to re-register |
| 16 | * them. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/pci.h> |
Jan Beulich | b95a7bd | 2011-12-06 07:49:30 +0000 | [diff] [blame] | 20 | #include <linux/module.h> |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 21 | #include <linux/acpi.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 23 | #include <acpi/acpi_bus.h> |
| 24 | |
| 25 | struct ioapic { |
| 26 | acpi_handle handle; |
| 27 | u32 gsi_base; |
| 28 | }; |
| 29 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 30 | static int ioapic_probe(struct pci_dev *dev, const struct pci_device_id *ent) |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 31 | { |
| 32 | acpi_handle handle; |
| 33 | acpi_status status; |
| 34 | unsigned long long gsb; |
| 35 | struct ioapic *ioapic; |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 36 | int ret; |
| 37 | char *type; |
Bjorn Helgaas | e1944c6 | 2010-03-16 15:53:08 -0600 | [diff] [blame] | 38 | struct resource *res; |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 39 | |
Rafael J. Wysocki | 3a83f99 | 2013-11-14 23:17:21 +0100 | [diff] [blame^] | 40 | handle = ACPI_HANDLE(&dev->dev); |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 41 | if (!handle) |
| 42 | return -EINVAL; |
| 43 | |
| 44 | status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb); |
| 45 | if (ACPI_FAILURE(status)) |
| 46 | return -EINVAL; |
| 47 | |
| 48 | /* |
| 49 | * The previous code in acpiphp evaluated _MAT if _GSB failed, but |
| 50 | * ACPI spec 4.0 sec 6.2.2 requires _GSB for hot-pluggable I/O APICs. |
| 51 | */ |
| 52 | |
| 53 | ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL); |
| 54 | if (!ioapic) |
| 55 | return -ENOMEM; |
| 56 | |
| 57 | ioapic->handle = handle; |
| 58 | ioapic->gsi_base = (u32) gsb; |
| 59 | |
| 60 | if (dev->class == PCI_CLASS_SYSTEM_PIC_IOAPIC) |
| 61 | type = "IOAPIC"; |
| 62 | else |
| 63 | type = "IOxAPIC"; |
| 64 | |
| 65 | ret = pci_enable_device(dev); |
| 66 | if (ret < 0) |
| 67 | goto exit_free; |
| 68 | |
| 69 | pci_set_master(dev); |
| 70 | |
| 71 | if (pci_request_region(dev, 0, type)) |
| 72 | goto exit_disable; |
| 73 | |
Bjorn Helgaas | e1944c6 | 2010-03-16 15:53:08 -0600 | [diff] [blame] | 74 | res = &dev->resource[0]; |
| 75 | if (acpi_register_ioapic(ioapic->handle, res->start, ioapic->gsi_base)) |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 76 | goto exit_release; |
| 77 | |
| 78 | pci_set_drvdata(dev, ioapic); |
Bjorn Helgaas | e1944c6 | 2010-03-16 15:53:08 -0600 | [diff] [blame] | 79 | dev_info(&dev->dev, "%s at %pR, GSI %u\n", type, res, ioapic->gsi_base); |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 80 | return 0; |
| 81 | |
| 82 | exit_release: |
| 83 | pci_release_region(dev, 0); |
| 84 | exit_disable: |
| 85 | pci_disable_device(dev); |
| 86 | exit_free: |
| 87 | kfree(ioapic); |
| 88 | return -ENODEV; |
| 89 | } |
| 90 | |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 91 | static void ioapic_remove(struct pci_dev *dev) |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 92 | { |
| 93 | struct ioapic *ioapic = pci_get_drvdata(dev); |
| 94 | |
| 95 | acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base); |
| 96 | pci_release_region(dev, 0); |
| 97 | pci_disable_device(dev); |
| 98 | kfree(ioapic); |
| 99 | } |
| 100 | |
| 101 | |
Jan Beulich | b95a7bd | 2011-12-06 07:49:30 +0000 | [diff] [blame] | 102 | static DEFINE_PCI_DEVICE_TABLE(ioapic_devices) = { |
| 103 | { PCI_DEVICE_CLASS(PCI_CLASS_SYSTEM_PIC_IOAPIC, ~0) }, |
| 104 | { PCI_DEVICE_CLASS(PCI_CLASS_SYSTEM_PIC_IOXAPIC, ~0) }, |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 105 | { } |
| 106 | }; |
Jan Beulich | b95a7bd | 2011-12-06 07:49:30 +0000 | [diff] [blame] | 107 | MODULE_DEVICE_TABLE(pci, ioapic_devices); |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 108 | |
| 109 | static struct pci_driver ioapic_driver = { |
| 110 | .name = "ioapic", |
| 111 | .id_table = ioapic_devices, |
| 112 | .probe = ioapic_probe, |
Bill Pemberton | 15856ad | 2012-11-21 15:35:00 -0500 | [diff] [blame] | 113 | .remove = ioapic_remove, |
Bjorn Helgaas | 204d49a | 2009-10-26 11:20:47 -0600 | [diff] [blame] | 114 | }; |
| 115 | |
Libo Chen | 54a5823 | 2013-05-27 10:28:53 +0800 | [diff] [blame] | 116 | module_pci_driver(ioapic_driver); |
Andrew Cooks | eba48cd | 2012-11-13 12:39:07 +0800 | [diff] [blame] | 117 | |
| 118 | MODULE_LICENSE("GPL"); |