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 <hutao@xxxxxxxxxxxxxx> > --- > > 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 <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); > +} > + > +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); > -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
