pvevent device is a qemu simulated device through which guest panic event is sent to host.
ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02293.html Signed-off-by: Hu Tao <hu...@cn.fujitsu.com> --- drivers/platform/x86/Kconfig | 7 +++ drivers/platform/x86/Makefile | 2 + drivers/platform/x86/pvevent.c | 115 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 124 insertions(+) create mode 100644 drivers/platform/x86/pvevent.c diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 7ab0b2f..369135e 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -768,4 +768,11 @@ config APPLE_GMUX graphics as well as the backlight. Currently only backlight control is supported by the driver. +config PVEVENT + tristate "pvevent device support" + depends on ACPI + ---help--- + This driver provides support for pvevent device, which is a qemu + simulated device through which guest panic event is sent to host. + endif # X86_PLATFORM_DEVICES diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index bf7e4f9..8779396 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -50,3 +50,5 @@ obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o + +obj-$(CONFIG_PVEVENT) += pvevent.o diff --git a/drivers/platform/x86/pvevent.c b/drivers/platform/x86/pvevent.c new file mode 100644 index 0000000..00ef7f4 --- /dev/null +++ b/drivers/platform/x86/pvevent.c @@ -0,0 +1,115 @@ +/* + * pvevent.c - pvevent Device Support + * + * Copyright (C) 2013 Fujitsu. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <acpi/acpi_bus.h> +#include <acpi/acpi_drivers.h> + +MODULE_AUTHOR("Hu Tao <hu...@cn.fujitsu.com>"); +MODULE_DESCRIPTION("pvevent device driver"); +MODULE_LICENSE("GPL"); + +static int pvevent_add(struct acpi_device *device); +static int pvevent_remove(struct acpi_device *device); + +static const struct acpi_device_id pvevent_device_ids[] = { + { "MSFT0001", 0}, + { "", 0}, +}; +MODULE_DEVICE_TABLE(acpi, pvevent_device_ids); + +#define PVEVENT_PANICKED (1 << 0) + +static acpi_handle handle; + +static struct acpi_driver pvevent_driver = { + .name = "pvevent", + .class = "QEMU", + .ids = pvevent_device_ids, + .ops = { + .add = pvevent_add, + .remove = pvevent_remove, + }, + .owner = THIS_MODULE, +}; + +static void +pvevent_send_event(unsigned int event) +{ + union acpi_object arg; + struct acpi_object_list arg_list; + + if (!handle) + return; + + arg.type = ACPI_TYPE_INTEGER; + arg.integer.value = event; + + arg_list.count = 1; + arg_list.pointer = &arg; + + acpi_evaluate_object(handle, "WRPT", &arg_list, NULL); +} + +static int +pvevent_panic_notify(struct notifier_block *nb, unsigned long code, + void *unused) +{ + pvevent_send_event(PVEVENT_PANICKED); + return NOTIFY_DONE; +} + +static struct notifier_block pvevent_panic_nb = { + .notifier_call = pvevent_panic_notify, +}; + +static int pvevent_add(struct acpi_device *device) +{ + acpi_status status; + u64 ret; + + status = acpi_evaluate_integer(device->handle, "_STA", NULL, + &ret); + + if (ACPI_FAILURE(status) || !ret) + return -ENODEV; + + handle = device->handle; + atomic_notifier_chain_register(&panic_notifier_list, + &pvevent_panic_nb); + + return 0; +} + +static int pvevent_remove(struct acpi_device *device) +{ + + atomic_notifier_chain_unregister(&panic_notifier_list, + &pvevent_panic_nb); + handle = NULL; + return 0; +} + +module_acpi_driver(pvevent_driver); -- 1.8.1.4
