linux-kernel - Re: [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP

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Date:   Wed, 20 Sep 2023 11:12:14 +0200
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Yu Chien Peter Lin <peterlin@...estech.com>,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, david@...hat.com, akpm@...ux-foundation.org,
        alexghiti@...osinc.com, bjorn@...osinc.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     conor.dooley@...rochip.com
Subject: Re: [PATCH v3 2/3] riscv: Introduce PBMT field to PTDUMP


On 20/09/2023 05:55, Yu Chien Peter Lin wrote:
> This patch introduces the PBMT field to the PTDUMP, so it can
> display the memory attributes for NC or IO.
>
> Signed-off-by: Yu Chien Peter Lin <peterlin@...estech.com>
> ---
> Changes v1 -> v2
> - no change
> Changes v2 -> v3
> - Add ".." when PBMT field is clear
> ---
>   arch/riscv/mm/ptdump.c | 16 ++++++++++++++++
>   1 file changed, 16 insertions(+)
>
> diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
> index 57a0926c6627..13997cf3fe36 100644
> --- a/arch/riscv/mm/ptdump.c
> +++ b/arch/riscv/mm/ptdump.c
> @@ -135,6 +135,12 @@ struct prot_bits {
>   
>   static const struct prot_bits pte_bits[] = {
>   	{
> +#ifdef CONFIG_64BIT
> +		.mask = _PAGE_MTMASK_SVPBMT,
> +		.set = "MT(%s)",
> +		.clear = "  ..  ",
> +	}, {
> +#endif
>   		.mask = _PAGE_SOFT,
>   		.set = "RSW(%d)",
>   		.clear = "  ..  ",
> @@ -205,6 +211,16 @@ static void dump_prot(struct pg_state *st)
>   		if (val) {
>   			if (pte_bits[i].mask == _PAGE_SOFT)
>   				sprintf(s, pte_bits[i].set, val >> 8);
> +#ifdef CONFIG_64BIT
> +			else if (pte_bits[i].mask == _PAGE_MTMASK_SVPBMT) {
> +				if (val == _PAGE_NOCACHE_SVPBMT)
> +					sprintf(s, pte_bits[i].set, "NC");
> +				else if (val == _PAGE_IO_SVPBMT)
> +					sprintf(s, pte_bits[i].set, "IO");
> +				else
> +					sprintf(s, pte_bits[i].set, "??");
> +			}
> +#endif
>   			else
>   				sprintf(s, "%s", pte_bits[i].set);
>   		} else {


You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Tested-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks!

Alex