linux-kernel - Re: [PATCH v2 3/5] MIPS: Loongson64: Enlarge IO_SPACE

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Message-ID: <004c3248-95f6-03ef-1d39-956794a844a7@flygoat.com>
Date:   Wed, 22 Jul 2020 13:57:22 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     linux-mips@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Frank Rowand <frowand.list@...il.com>,
        Paul Burton <paulburton@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] MIPS: Loongson64: Enlarge IO_SPACE_LIMIT



在 2020/7/21 下午10:17, Jiaxun Yang 写道:
> 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..fa5ea4ee8b6c 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  PCI_IOSIZE
Oops, it should be (PCI_IOSIZE - 1), will fix in next revision.

Sorry for the noise.

Thanks.

- Jiaxun

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