On Fri, May 03, 2013 at 10:47:10AM +0800, Hu Tao wrote:
> pvpanic device is a qemu simulated device through which guest panic
> event is sent to host.
>
> Signed-off-by: Hu Tao <hutao@xxxxxxxxxxxxxx>
> ---
> drivers/platform/x86/Kconfig | 7 +++
> drivers/platform/x86/Makefile | 2 +
> drivers/platform/x86/pvpanic.c | 115 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 124 insertions(+)
> create mode 100644 drivers/platform/x86/pvpanic.c
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 3338437..527ed04 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -781,4 +781,11 @@ config APPLE_GMUX
> graphics as well as the backlight. Currently only backlight
> control is supported by the driver.
>
> +config PVPANIC
> + tristate "pvpanic device support"
> + depends on ACPI
> + ---help---
> + This driver provides support for pvpanic 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 ace2b38..ef0ec74 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -51,3 +51,5 @@ obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
> obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o
> obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o
> obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
> +
> +obj-$(CONFIG_PVPANIC) += pvpanic.o
> diff --git a/drivers/platform/x86/pvpanic.c b/drivers/platform/x86/pvpanic.c
> new file mode 100644
> index 0000000..81c95ec
> --- /dev/null
> +++ b/drivers/platform/x86/pvpanic.c
> @@ -0,0 +1,115 @@
> +/*
> + * pvpanic.c - pvpanic 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 <hutao@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("pvpanic device driver");
> +MODULE_LICENSE("GPL");
> +
> +static int pvpanic_add(struct acpi_device *device);
> +static int pvpanic_remove(struct acpi_device *device);
> +
> +static const struct acpi_device_id pvpanic_device_ids[] = {
> + { "QEMU0001", 0},
> + { "", 0},
> +};
> +MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
> +
> +#define PVPANIC_PANICKED (1 << 0)
> +
> +static acpi_handle handle;
> +
> +static struct acpi_driver pvpanic_driver = {
> + .name = "pvpanic",
> + .class = "QEMU",
> + .ids = pvpanic_device_ids,
> + .ops = {
> + .add = pvpanic_add,
> + .remove = pvpanic_remove,
> + },
> + .owner = THIS_MODULE,
> +};
> +
> +static void
> +pvpanic_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);
> +}
Is it safe to call acpi_evaluate_object from a panic notifier? For
example:
- Has it been confirmed that no code invoked via acpi_evaluate_object can panic() ?
- acpi_ex_enter_interpreter grabs a mutex. Is that path ever used?
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