linux-kernel - Re: [PATCH 3/5] MIPS: Loongson64: Enlarge IO_SPACE

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Message-ID: <CAAhV-H5sYFUnzgdJwV1SUpfJeZPMTsUVP3i-R0sebi2y9oW_cg@mail.gmail.com>
Date:   Mon, 20 Jul 2020 18:03:30 +0800
From:   Huacai Chen <chenhc@...ote.com>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     "open list:MIPS" <linux-mips@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Frank Rowand <frowand.list@...il.com>,
        Paul Burton <paulburton@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] MIPS: Loongson64: Enlarge IO_SPACE_LIMIT

Hi, Jiaxun,

On Mon, Jul 20, 2020 at 3:45 PM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
>
> It can be very big on LS7A PCH systems.
>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
>  arch/mips/include/asm/io.h                     | 3 ++-
>  arch/mips/include/asm/mach-loongson64/spaces.h | 3 +--
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
> index 346fffd9e972..0072489325fa 100644
> --- a/arch/mips/include/asm/io.h
> +++ b/arch/mips/include/asm/io.h
> @@ -50,8 +50,9 @@
>  # define __relaxed_ioswabq ioswabq
>
>  /* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */
> -
> +#ifndef IO_SPACE_LIMIT
>  #define IO_SPACE_LIMIT 0xffff
> +#endif
>
>  /*
>   * On MIPS I/O ports are memory mapped, so we access them using normal
> diff --git a/arch/mips/include/asm/mach-loongson64/spaces.h b/arch/mips/include/asm/mach-loongson64/spaces.h
> index 3de0ac9d8829..b99b43854929 100644
> --- a/arch/mips/include/asm/mach-loongson64/spaces.h
> +++ b/arch/mips/include/asm/mach-loongson64/spaces.h
> @@ -11,8 +11,7 @@
>  #define PCI_IOSIZE     SZ_16M
>  #define MAP_BASE       (PCI_IOBASE + PCI_IOSIZE)
>
> -/* Reserved at the start of PCI_IOBASE for legacy drivers */
> -#define MMIO_LOWER_RESERVED    0x10000
> +#define IO_SPACE_LIMIT 0x00ffffff
Maybe using 0xffffff is better?

Huacai
>
>  #include <asm/mach-generic/spaces.h>
>  #endif
> --
> 2.28.0.rc1
>