linux-kernel - Re: [PATCH V3 3/5] misc/pvpanic: add MMIO support

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Date:   Mon, 29 Oct 2018 12:30:23 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     peng.hao2@....com.cn
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,
        Linux Documentation List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH V3 3/5] misc/pvpanic: add MMIO support

On Mon, Oct 29, 2018 at 5:22 AM Peng Hao <peng.hao2@....com.cn> wrote:
>
> On some architectures (e.g. arm64), it's preferable to use MMIO, since
> this can be used standalone. Add MMIO support to the pvpanic driver.

>  pvpanic_walk_resources(struct acpi_resource *res, void *context)
>  {
> +       struct acpi_resource_fixed_memory32 *fixmem32;
> +
>         switch (res->type) {
>         case ACPI_RESOURCE_TYPE_END_TAG:
>                 return AE_OK;
>
>         case ACPI_RESOURCE_TYPE_IO:
> -               port = res->data.io.minimum;
> +               base = (void __iomem *) ioport_map(res->data.io.minimum, 1);
> +               return AE_OK;
> +
> +       case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
> +               fixmem32 = &res->data.fixed_memory32;
> +               base = ioremap(fixmem32->address, fixmem32->address_length);
>                 return AE_OK;

Ouch. Sorry, I forgot to look at this previously.

This should be converted to use
acpi_dev_resource_io()
acpi_dev_resource_memory()

-- 
With Best Regards,
Andy Shevchenko