linux-kernel - Re: [PATCH 1/4] RAS: ATL: Read DRAM hole base early

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Message-ID: <10919f69-4008-4156-88e4-3c72e3775562@amd.com>
Date: Mon, 18 Mar 2024 11:06:02 -0400
From: Yazen Ghannam <yazen.ghannam@....com>
To: John Allen <john.allen@....com>, bp@...en8.de,
 linux-edac@...r.kernel.org, tony.luck@...el.com
Cc: yazen.ghannam@....com, linux-kernel@...r.kernel.org,
 avadhut.naik@....com, muralidhara.mk@....com
Subject: Re: [PATCH 1/4] RAS: ATL: Read DRAM hole base early

On 3/14/24 12:35, John Allen wrote:

Please use "RAS/AMD/ATL:" for the $SUBJECT prefix.

> Read DRAM hole base when constructing the address map as the value will
> not change during translation.

More specifically, the value will not change during run time.

> 
> Signed-off-by: John Allen <john.allen@....com>
> ---
>   drivers/ras/amd/atl/core.c     | 15 ++-------------
>   drivers/ras/amd/atl/internal.h |  2 ++
>   drivers/ras/amd/atl/system.c   | 21 +++++++++++++++++++++
>   3 files changed, 25 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/ras/amd/atl/core.c b/drivers/ras/amd/atl/core.c
> index 6dc4e06305f7..c1710d233adb 100644
> --- a/drivers/ras/amd/atl/core.c
> +++ b/drivers/ras/amd/atl/core.c
> @@ -51,22 +51,11 @@ static bool legacy_hole_en(struct addr_ctx *ctx)
>   
>   static int add_legacy_hole(struct addr_ctx *ctx)
>   {
> -	u32 dram_hole_base;
> -	u8 func = 0;
> -
>   	if (!legacy_hole_en(ctx))
>   		return 0;
>   
> -	if (df_cfg.rev >= DF4)
> -		func = 7;
> -
> -	if (df_indirect_read_broadcast(ctx->node_id, func, 0x104, &dram_hole_base))
> -		return -EINVAL;
> -
> -	dram_hole_base &= DF_DRAM_HOLE_BASE_MASK;
> -
> -	if (ctx->ret_addr >= dram_hole_base)
> -		ctx->ret_addr += (BIT_ULL(32) - dram_hole_base);
> +	if (ctx->addr >= df_cfg.dram_hole_base)
> +		ctx->addr += (BIT_ULL(32) - df_cfg.dram_hole_base);

There is a compilation error here. Please make sure to build each patch
individually.

Thanks,
Yazen