linux-kernel - Re: [PATCH] Implement ioremap_prot support (v2)

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Date:   Fri, 2 Dec 2022 10:36:07 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Jianwen Jiang <jiangjianwen@...ontech.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, alexandre.ghiti@...onical.com,
        geert@...ux-m68k.org, panqinglin2020@...as.ac.cn, arnd@...db.de,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]     Implement ioremap_prot support (v2)

Hello!

On Fri, Dec 02, 2022 at 04:33:56PM +0800, Jianwen Jiang wrote:a
> [PATCH]     Implement ioremap_prot support (v2)

Some process bits.. Please put the v2 inside the leading [], git
format-patch will do this for you with the `-v N` arg. Also, please add
a subsytem prefix to the $subject & drop the leading spaces.

>     Feature ioremap_prot only needs an implementation of pte_pgprot on riscv.

There's also no need to tab this stuff in

>     That macro is similar to the same one on platform loongarch, mips and sh.
>     We just need:
>     1. replace _PFN_MASK with _PAGE_PFN_MASK in pte_gpprot;
>     2. add "select HAVE_IOREMAP_PROT" into arch/riscv/Kconfig;
>     3. add "depends on MMU" into drivers/fpga/Kconfig to fix the building error "undefined reference to generic_access_phys".
> 
>     Signed-off-by: Jianwen Jiang <jiangjianwen@...ontech.com>

And this line should not be tabbed in.

> ---
>  arch/riscv/Kconfig            | 1 +
>  arch/riscv/include/asm/page.h | 2 ++
>  drivers/fpga/Kconfig          | 1 +

This needs to go as a separate patch to the FPGA subsystem, with the
FPGA maintainers in to/cc.

>  3 files changed, 4 insertions(+)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index fa78595a6089..5ed2c7361040 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -95,6 +95,7 @@ config RISCV
>  	select HAVE_FUNCTION_ERROR_INJECTION
>  	select HAVE_GCC_PLUGINS
>  	select HAVE_GENERIC_VDSO if MMU && 64BIT
> +	select HAVE_IOREMAP_PROT
>  	select HAVE_IRQ_TIME_ACCOUNTING
>  	select HAVE_KPROBES if !XIP_KERNEL
>  	select HAVE_KPROBES_ON_FTRACE if !XIP_KERNEL
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index ac70b0fd9a9a..cb08a4911d60 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -84,6 +84,8 @@ typedef struct page *pgtable_t;
>  #define __pgd(x)	((pgd_t) { (x) })
>  #define __pgprot(x)	((pgprot_t) { (x) })
>  
> +#define pte_pgprot(x)  __pgprot(pte_val(x) & ~_PAGE_PFN_MASK)
> +
>  #ifdef CONFIG_64BIT
>  #define PTE_FMT "%016lx"
>  #else
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index bbe0a7cabb75..0493272b8bff 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -5,6 +5,7 @@
>  
>  menuconfig FPGA
>  	tristate "FPGA Configuration Framework"
> +	depends on MMU

How come no other arch needs this dependancy?

Thanks,
Conor.

>  	help
>  	  Say Y here if you want support for configuring FPGAs from the
>  	  kernel.  The FPGA framework adds an FPGA manager class and FPGA
> -- 
> 2.37.3.446.gd42b38dfb5
> 
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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