8b48463f89
Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions and remove some inclusions of those files that aren't necessary. First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> should not be included directly from any files that are built for CONFIG_ACPI unset, because that generally leads to build warnings about undefined symbols in !CONFIG_ACPI builds. For CONFIG_ACPI set, <linux/acpi.h> includes those files and for CONFIG_ACPI unset it provides stub ACPI symbols to be used in that case. Second, there are ordering dependencies between those files that always have to be met. Namely, it is required that <acpi/acpi_bus.h> be included prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the latter depends on are always there. And <acpi/acpi.h> which provides basic ACPICA type declarations should always be included prior to any other ACPI headers in CONFIG_ACPI builds. That also is taken care of including <linux/acpi.h> as appropriate. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci stuff) Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> (Xen stuff) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* pvpanic.c - pvpanic Device Support
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*
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* Copyright (C) 2013 Fujitsu.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
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MODULE_DESCRIPTION("pvpanic device driver");
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MODULE_LICENSE("GPL");
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static int pvpanic_add(struct acpi_device *device);
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static int pvpanic_remove(struct acpi_device *device);
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static const struct acpi_device_id pvpanic_device_ids[] = {
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{ "QEMU0001", 0 },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
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#define PVPANIC_PANICKED (1 << 0)
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static u16 port;
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static struct acpi_driver pvpanic_driver = {
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.name = "pvpanic",
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.class = "QEMU",
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.ids = pvpanic_device_ids,
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.ops = {
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.add = pvpanic_add,
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.remove = pvpanic_remove,
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},
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.owner = THIS_MODULE,
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};
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static void
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pvpanic_send_event(unsigned int event)
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{
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outb(event, port);
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}
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static int
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pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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pvpanic_send_event(PVPANIC_PANICKED);
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return NOTIFY_DONE;
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}
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static struct notifier_block pvpanic_panic_nb = {
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.notifier_call = pvpanic_panic_notify,
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};
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static acpi_status
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pvpanic_walk_resources(struct acpi_resource *res, void *context)
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{
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switch (res->type) {
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case ACPI_RESOURCE_TYPE_END_TAG:
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return AE_OK;
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case ACPI_RESOURCE_TYPE_IO:
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port = res->data.io.minimum;
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return AE_OK;
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default:
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return AE_ERROR;
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}
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}
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static int pvpanic_add(struct acpi_device *device)
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{
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acpi_status status;
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u64 ret;
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status = acpi_evaluate_integer(device->handle, "_STA", NULL,
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&ret);
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if (ACPI_FAILURE(status) || (ret & 0x0B) != 0x0B)
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return -ENODEV;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS,
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pvpanic_walk_resources, NULL);
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if (!port)
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return -ENODEV;
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atomic_notifier_chain_register(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static int pvpanic_remove(struct acpi_device *device)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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module_acpi_driver(pvpanic_driver);
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