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[Qemu-devel] [PATCH] pvevent: pvevent device driver


From: Hu Tao
Subject: [Qemu-devel] [PATCH] pvevent: pvevent device driver
Date: Thu, 14 Mar 2013 16:51:13 +0800

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 <address@hidden>
---
 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 <address@hidden>");
+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




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