* [PATCH v19] pvpanic: pvpanic device driver
@ 2013-05-08 3:15 Hu Tao
2013-05-10 5:00 ` Hu Tao
2013-05-10 18:57 ` Marcelo Tosatti
0 siblings, 2 replies; 3+ messages in thread
From: Hu Tao @ 2013-05-08 3:15 UTC (permalink / raw)
To: platform-driver-x86, kvm
Cc: Matthew Garrett, Paolo Bonzini, Marcelo Tosatti, hutao
pvpanic device is a qemu simulated device through which guest panic
event is sent to host.
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
v18 -> v19: 1. return -ENODEV early if port is 0
v17 -> v18: 1. call acpi_walk_resources to get the port, and usb outb instead
of acpi_evaluate_oject in panic notifier callback
2. reword help message
drivers/platform/x86/Kconfig | 8 +++
drivers/platform/x86/Makefile | 2 +
drivers/platform/x86/pvpanic.c | 124 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 134 insertions(+)
create mode 100644 drivers/platform/x86/pvpanic.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 3338437..8577261 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -781,4 +781,12 @@ 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 the pvpanic device. pvpanic is
+ a paravirtualized device provided by QEMU; it lets a virtual machine
+ (guest) communicate panic events to the 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..47ae0c4
--- /dev/null
+++ b/drivers/platform/x86/pvpanic.c
@@ -0,0 +1,124 @@
+/*
+ * 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@cn.fujitsu.com>");
+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 u16 port;
+
+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)
+{
+ outb(event, port);
+}
+
+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 acpi_status
+pvpanic_walk_resources(struct acpi_resource *res, void *context)
+{
+ switch (res->type) {
+ case ACPI_RESOURCE_TYPE_END_TAG:
+ return AE_OK;
+
+ case ACPI_RESOURCE_TYPE_IO:
+ port = res->data.io.minimum;
+ return AE_OK;
+
+ default:
+ return AE_ERROR;
+ }
+}
+
+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 & 0x0B) != 0x0B)
+ return -ENODEV;
+
+ acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+ pvpanic_walk_resources, NULL);
+
+ if (!port)
+ return -ENODEV;
+
+ 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);
+ return 0;
+}
+
+module_acpi_driver(pvpanic_driver);
--
1.8.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v19] pvpanic: pvpanic device driver
2013-05-08 3:15 [PATCH v19] pvpanic: pvpanic device driver Hu Tao
@ 2013-05-10 5:00 ` Hu Tao
2013-05-10 18:57 ` Marcelo Tosatti
1 sibling, 0 replies; 3+ messages in thread
From: Hu Tao @ 2013-05-10 5:00 UTC (permalink / raw)
To: platform-driver-x86, kvm; +Cc: Matthew Garrett, Paolo Bonzini, Marcelo Tosatti
On Wed, May 08, 2013 at 11:15:32AM +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@cn.fujitsu.com>
> ---
>
> v18 -> v19: 1. return -ENODEV early if port is 0
>
> v17 -> v18: 1. call acpi_walk_resources to get the port, and usb outb instead
> of acpi_evaluate_oject in panic notifier callback
> 2. reword help message
>
> drivers/platform/x86/Kconfig | 8 +++
> drivers/platform/x86/Makefile | 2 +
> drivers/platform/x86/pvpanic.c | 124 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 134 insertions(+)
> create mode 100644 drivers/platform/x86/pvpanic.c
>
ping...
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v19] pvpanic: pvpanic device driver
2013-05-08 3:15 [PATCH v19] pvpanic: pvpanic device driver Hu Tao
2013-05-10 5:00 ` Hu Tao
@ 2013-05-10 18:57 ` Marcelo Tosatti
1 sibling, 0 replies; 3+ messages in thread
From: Marcelo Tosatti @ 2013-05-10 18:57 UTC (permalink / raw)
To: Hu Tao; +Cc: platform-driver-x86, kvm, Matthew Garrett, Paolo Bonzini
On Wed, May 08, 2013 at 11:15:32AM +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@cn.fujitsu.com>
> ---
>
> v18 -> v19: 1. return -ENODEV early if port is 0
>
> v17 -> v18: 1. call acpi_walk_resources to get the port, and usb outb instead
> of acpi_evaluate_oject in panic notifier callback
> 2. reword help message
>
> drivers/platform/x86/Kconfig | 8 +++
> drivers/platform/x86/Makefile | 2 +
> drivers/platform/x86/pvpanic.c | 124 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 134 insertions(+)
> create mode 100644 drivers/platform/x86/pvpanic.c
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 3338437..8577261 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -781,4 +781,12 @@ 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 the pvpanic device. pvpanic is
> + a paravirtualized device provided by QEMU; it lets a virtual machine
> + (guest) communicate panic events to the 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..47ae0c4
> --- /dev/null
> +++ b/drivers/platform/x86/pvpanic.c
> @@ -0,0 +1,124 @@
> +/*
> + * 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@cn.fujitsu.com>");
> +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 u16 port;
> +
> +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)
> +{
> + outb(event, port);
> +}
> +
> +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 acpi_status
> +pvpanic_walk_resources(struct acpi_resource *res, void *context)
> +{
> + switch (res->type) {
> + case ACPI_RESOURCE_TYPE_END_TAG:
> + return AE_OK;
> +
> + case ACPI_RESOURCE_TYPE_IO:
> + port = res->data.io.minimum;
> + return AE_OK;
> +
> + default:
> + return AE_ERROR;
> + }
> +}
> +
> +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 & 0x0B) != 0x0B)
> + return -ENODEV;
> +
> + acpi_walk_resources(device->handle, METHOD_NAME__CRS,
> + pvpanic_walk_resources, NULL);
> +
> + if (!port)
> + return -ENODEV;
> +
> + 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);
> + return 0;
> +}
> +
> +module_acpi_driver(pvpanic_driver);
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-05-10 19:04 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2013-05-08 3:15 [PATCH v19] pvpanic: pvpanic device driver Hu Tao
2013-05-10 5:00 ` Hu Tao
2013-05-10 18:57 ` Marcelo Tosatti
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