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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: peng.hao2@zte.com.cn
Cc: Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andy Shevchenko <andy@infradead.org>,
	Darren Hart <dvhart@infradead.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Platform Driver <platform-driver-x86@vger.kernel.org>,
	hutao@cn.fujitsu.com,
	Linux Documentation List <linux-doc@vger.kernel.org>
Subject: Re: [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT
Date: Wed, 31 Oct 2018 14:50:04 +0200	[thread overview]
Message-ID: <CAHp75VdmfP82hTxUjy=-4FaQCNyHdzDZx76S_Y=ovwxkyPEfuw@mail.gmail.com> (raw)
In-Reply-To: <1540993041-25611-4-git-send-email-peng.hao2@zte.com.cn>

On Wed, Oct 31, 2018 at 7:27 AM Peng Hao <peng.hao2@zte.com.cn> wrote:
>
> By default, when ACPI tables and FDT coexist for ARM64,
> current kernel takes precedence over FDT to get device information.
> Virt machine in qemu provides both FDT and ACPI table. This patch
> increases the way to get information through FDT.
>
> Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
> ---
>  drivers/misc/pvpanic.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 64 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
> index d0e28b2..861a0eb 100644
> --- a/drivers/misc/pvpanic.c
> +++ b/drivers/misc/pvpanic.c
> @@ -3,15 +3,18 @@
>   *  Pvpanic Device Support
>   *
>   *  Copyright (C) 2013 Fujitsu.
> + *  Copyright (C) 2018 ZTE.
>   */
>
>  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <linux/acpi.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
> -#include <linux/init.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
>  #include <linux/types.h>
> -#include <linux/acpi.h>
>
>  MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
>  MODULE_DESCRIPTION("pvpanic device driver");
> @@ -22,7 +25,7 @@
>
>  static const struct acpi_device_id pvpanic_device_ids[] = {
>         { "QEMU0001", 0 },
> -       { "", 0 },
> +       { "", 0 }
>  };
>  MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
>
> @@ -60,6 +63,32 @@
>         .priority = 1, /* let this called before broken drm_fb_helper */
>  };
>
> +static int pvpanic_mmio_probe(struct platform_device *pdev)
> +{
> +       struct resource *mem;
> +
> +       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (!mem)
> +               return -EINVAL;
> +
> +       base = devm_ioremap_resource(&pdev->dev, mem);
> +       if (base == NULL)
> +               return -EFAULT;
> +
> +       atomic_notifier_chain_register(&panic_notifier_list,
> +                                      &pvpanic_panic_nb);
> +
> +       return 0;
> +}
> +
> +static int pvpanic_mmio_remove(struct platform_device *pdev)
> +{
> +
> +       atomic_notifier_chain_unregister(&panic_notifier_list,
> +                                        &pvpanic_panic_nb);
> +
> +       return 0;
> +}
>
>  static acpi_status
>  pvpanic_walk_resources(struct acpi_resource *res, void *context)
> @@ -120,4 +149,35 @@ static int pvpanic_remove(struct acpi_device *device)
>         return 0;
>  }
>
> -module_acpi_driver(pvpanic_driver);
> +static const struct of_device_id pvpanic_mmio_match[] = {
> +       { .compatible = "qemu,pvpanic-mmio", },
> +       {}
> +};
> +
> +static struct platform_driver pvpanic_mmio_driver = {
> +       .driver = {
> +               .name = "pvpanic-mmio",
> +               .of_match_table = pvpanic_mmio_match,
> +       },
> +       .probe = pvpanic_mmio_probe,
> +       .remove = pvpanic_mmio_remove,
> +};
> +
> +static int __init pvpanic_mmio_init(void)
> +{
> +       if (acpi_disabled)
> +               return platform_driver_register(&pvpanic_mmio_driver);
> +       else
> +               return acpi_bus_register_driver(&pvpanic_driver);
> +}
> +
> +static void __exit pvpanic_mmio_exit(void)
> +{
> +       if (acpi_disabled)
> +               platform_driver_unregister(&pvpanic_mmio_driver);
> +       else
> +               acpi_bus_unregister_driver(&pvpanic_driver);
> +}
> +
> +module_init(pvpanic_mmio_init);
> +module_exit(pvpanic_mmio_exit);
> --
> 1.8.3.1
>


-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2018-10-31 12:50 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-31 13:37 [PATCH V4 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
2018-10-31  7:05 ` Mark Rutland
2018-10-31 12:45 ` Andy Shevchenko
2018-10-31 13:37 ` [PATCH V4 2/5] misc/pvpanic : convert to SPDX license tags Peng Hao
2018-10-31 12:46   ` Andy Shevchenko
2018-10-31 13:37 ` [PATCH V4 3/5] misc/pvpanic: add MMIO support Peng Hao
2018-10-31 12:49   ` Andy Shevchenko
2018-10-31 13:37 ` [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
2018-10-31 12:50   ` Andy Shevchenko [this message]
2018-10-31 12:53   ` Andy Shevchenko
2018-10-31 13:37 ` [PATCH V4 5/5] dt-bindings/misc/pvpanic :add document for pvpanic-mmio Peng Hao
  -- strict thread matches above, loose matches on Subject: below --
2018-10-29 11:32 [PATCH V3 1/5] pvpanic: move pvpanic to misc as common driver Peng Hao
2018-10-29 11:32 ` [PATCH V4 4/5] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
2018-10-29 11:37   ` Andy Shevchenko

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