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Message-ID: <CAHp75VdJ2LykRx0A8_qHFbA-RCVoeBJq7Sj_0OzVJ0jZXAXA5g@mail.gmail.com>
Date: Wed, 24 Oct 2018 16:08:30 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: peng.hao2@....com.cn, "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andy Shevchenko <andy@...radead.org>,
Darren Hart <dvhart@...radead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Platform Driver <platform-driver-x86@...r.kernel.org>,
hutao@...fujitsu.com
Subject: Re: [PATCH V2 1/4] misc/pvpanic: move pvpanic to misc as common driver
On Wed, Oct 24, 2018 at 12:02 PM Peng Hao <peng.hao2@....com.cn> wrote:
>
> move pvpanic.c from drivers/platform/x86 to drivers/misc.
> following patches will use pvpanic device in arm64.
>
-C -M usually helps in such patches.
The question is perhaps this should go under drivers/acpi?
Rafael, what do you think?
> Signed-off-by: Peng Hao <peng.hao2@....com.cn>
> ---
> drivers/misc/Kconfig | 7 +++
> drivers/misc/Makefile | 1 +
> drivers/misc/pvpanic.c | 124 +++++++++++++++++++++++++++++++++++++++++
> drivers/platform/Kconfig | 3 +
> drivers/platform/Makefile | 1 +
> drivers/platform/x86/Kconfig | 8 ---
> drivers/platform/x86/Makefile | 1 -
> drivers/platform/x86/pvpanic.c | 124 -----------------------------------------
> 8 files changed, 136 insertions(+), 133 deletions(-)
> create mode 100644 drivers/misc/pvpanic.c
> delete mode 100644 drivers/platform/x86/pvpanic.c
>
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 5d71300..ca55c94 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -499,6 +499,13 @@ config MISC_RTSX
> tristate
> default MISC_RTSX_PCI || MISC_RTSX_USB
>
> +config PVPANIC
> + tristate "pvpanic device support"
> + 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.
> +
> source "drivers/misc/c2port/Kconfig"
> source "drivers/misc/eeprom/Kconfig"
> source "drivers/misc/cb710/Kconfig"
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> index 20be70c..39dc005 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -57,3 +57,4 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
> obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o
> obj-$(CONFIG_OCXL) += ocxl/
> obj-$(CONFIG_MISC_RTSX) += cardreader/
> +obj-$(CONFIG_PVPANIC) += pvpanic.o
> diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
> new file mode 100644
> index 0000000..fd86dab
> --- /dev/null
> +++ b/drivers/misc/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 <linux/acpi.h>
> +
> +MODULE_AUTHOR("Hu Tao <hutao@...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,
> + .priority = 1, /* let this called before broken drm_fb_helper */
> +};
> +
> +
> +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)
> +{
> + int ret;
> +
> + ret = acpi_bus_get_status(device);
> + if (ret < 0)
> + return ret;
> +
> + if (!device->status.enabled || !device->status.functional)
> + 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);
> diff --git a/drivers/platform/Kconfig b/drivers/platform/Kconfig
> index d4c2e42..8b64b78 100644
> --- a/drivers/platform/Kconfig
> +++ b/drivers/platform/Kconfig
> @@ -1,3 +1,6 @@
> +if ARM64
> +source "drivers/platform/arm/Kconfig"
> +endif
> if X86
> source "drivers/platform/x86/Kconfig"
> endif
> diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile
> index 4b2ce58..232231c 100644
> --- a/drivers/platform/Makefile
> +++ b/drivers/platform/Makefile
> @@ -3,6 +3,7 @@
> # Makefile for linux/drivers/platform
> #
>
> +obj-$(CONFIG_ARM64) += arm/
> obj-$(CONFIG_X86) += x86/
> obj-$(CONFIG_MELLANOX_PLATFORM) += mellanox/
> obj-$(CONFIG_MIPS) += mips/
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index ef016e4..a6b412e 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -1119,14 +1119,6 @@ config INTEL_SMARTCONNECT
> This driver checks to determine whether the device has Intel Smart
> Connect enabled, and if so disables it.
>
> -config PVPANIC
> - tristate "pvpanic device support"
> - depends on ACPI
> - ---help---
> - This driver provides support for the pvpanic device. pvpanic is
> - a paravirtualized device provided by QEMU; it lets a virtual machine
> - (guest) communicate panic events to the host.
> -
> config INTEL_PMC_IPC
> tristate "Intel PMC IPC Driver"
> depends on ACPI
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 2ba6cb7..a4ec299 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -75,7 +75,6 @@ obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o
> obj-$(CONFIG_INTEL_RST) += intel-rst.o
> obj-$(CONFIG_INTEL_SMARTCONNECT) += intel-smartconnect.o
>
> -obj-$(CONFIG_PVPANIC) += pvpanic.o
> obj-$(CONFIG_ALIENWARE_WMI) += alienware-wmi.o
> obj-$(CONFIG_INTEL_PMC_IPC) += intel_pmc_ipc.o
> obj-$(CONFIG_SILEAD_DMI) += silead_dmi.o
> diff --git a/drivers/platform/x86/pvpanic.c b/drivers/platform/x86/pvpanic.c
> deleted file mode 100644
> index fd86dab..0000000
> --- a/drivers/platform/x86/pvpanic.c
> +++ /dev/null
> @@ -1,124 +0,0 @@
> -/*
> - * 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 <linux/acpi.h>
> -
> -MODULE_AUTHOR("Hu Tao <hutao@...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,
> - .priority = 1, /* let this called before broken drm_fb_helper */
> -};
> -
> -
> -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)
> -{
> - int ret;
> -
> - ret = acpi_bus_get_status(device);
> - if (ret < 0)
> - return ret;
> -
> - if (!device->status.enabled || !device->status.functional)
> - 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);
> --
> 1.8.3.1
>
--
With Best Regards,
Andy Shevchenko
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