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Re: [Qemu-devel] [PATCH v16] pvpanic: pvpanic device driver
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v16] pvpanic: pvpanic device driver |
Date: |
Fri, 29 Mar 2013 10:31:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
Il 29/03/2013 09:34, Hu Tao ha scritto:
> pvpanic device is a qemu simulated device through which guest panic
> event is sent to host.
>
> Signed-off-by: Hu Tao <address@hidden>
> ---
>
> ref: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg05297.html
>
> 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..e6ea595
> --- /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 <address@hidden>");
> +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);
> +}
> +
> +static int
> +pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
> + void *unused)
> +{
> + pvpanic_send_event(PVPANIC_PANICKED);
> + return NOTIFY_DONE;
> +}
> +
> +static struct notifier_block pvpanic_panic_nb = {
> + .notifier_call = pvpanic_panic_notify,
> +};
> +
> +static int pvpanic_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;
Please return if (ret & 0x0B) != 0x0B. This checks:
Bit 0 - Set if the device is present.
Bit 1 - Set if the device is enabled and decoding its resources.
Bit 3 - Set if the device is functioning properly.
Otherwise looks good.
> +
> + handle = device->handle;
> + atomic_notifier_chain_register(&panic_notifier_list,
> + &pvpanic_panic_nb);
> +
> + return 0;
> +}
> +
> +static int pvpanic_remove(struct acpi_device *device)
> +{
> +
> + atomic_notifier_chain_unregister(&panic_notifier_list,
> + &pvpanic_panic_nb);
> + handle = NULL;
> + return 0;
> +}
> +
> +module_acpi_driver(pvpanic_driver);
>
- [Qemu-devel] [PATCH v16 5/6] pc_piix, pc_q35: export fw_cfg, (continued)
- [Qemu-devel] [PATCH v16 5/6] pc_piix, pc_q35: export fw_cfg, Hu Tao, 2013/03/29
- [Qemu-devel] [PATCH v16 6/6] pvpanic: pass configurable ioport to seabios, Hu Tao, 2013/03/29
- [Qemu-devel] [PATCH v16 4/6] pvpanic: add document of pvpanic, Hu Tao, 2013/03/29
- [Qemu-devel] [PATCH v16 1/6] add a new runstate: RUN_STATE_GUEST_PANICKED, Hu Tao, 2013/03/29
- [Qemu-devel] [PATCH v16] Add pvpanic device driver, Hu Tao, 2013/03/29
- [Qemu-devel] [PATCH v16] pvpanic: pvpanic device driver, Hu Tao, 2013/03/29
- Re: [Qemu-devel] [PATCH v16] pvpanic: pvpanic device driver,
Paolo Bonzini <=