On Thu, Mar 14, 2013 at 8:51 AM, Hu Tao <hu...@cn.fujitsu.com> wrote:
> 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
Current address of FSF is:
51 Franklin Street, Fifth Floor
Boston, MA 02110-1301
USA
I'd use the web version recommended by FSF.
> + */
> +
> +#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
>
