linux-kernel - Re: [PATCH v2 06/31] EDAC/amd64: Define Data Fabric operations

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Date:   Wed, 30 Jun 2021 19:19:45 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Yazen Ghannam <yazen.ghannam@....com>
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        mchehab@...nel.org, tony.luck@...el.com,
        Smita.KoralahalliChannabasappa@....com
Subject: Re: [PATCH v2 06/31] EDAC/amd64: Define Data Fabric operations

On Wed, Jun 23, 2021 at 07:19:37PM +0000, Yazen Ghannam wrote:
> Define a stub to hold operations for different Data Fabric versions.
> This will be filled in following patches.
> 
> Define a function to set the appropriate operations. Use a return code
> because future updates have checks that may fail.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
> Link:
> https://lkml.kernel.org/r/20210507190140.18854-3-Yazen.Ghannam@amd.com
> 
> v1->v2:
> * New in v2.
> 
>  drivers/edac/amd64_edac.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index 62eca188458f..f769353ef7e4 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -1085,6 +1085,21 @@ struct addr_ctx {
>  	u8 inst_id;
>  };
>  
> +struct data_fabric_ops {
> +};
> +
> +struct data_fabric_ops df2_ops = {
> +};
> +
> +struct data_fabric_ops *df_ops;
> +
> +static int set_df_ops(struct addr_ctx *ctx)
> +{
> +	df_ops = &df2_ops;
> +
> +	return 0;
> +}
> +
>  static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
>  {
>  	u64 dram_base_addr, dram_limit_addr, dram_hole_base;
> @@ -1110,6 +1125,9 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
>  	ctx.nid = nid;
>  	ctx.inst_id = umc;
>  
> +	if (set_df_ops(&ctx))
> +		return -EINVAL;
> +
>  	if (amd_df_indirect_read(nid, df_regs[DRAM_OFFSET], umc, &tmp))
>  		goto out_err;
>  
> -- 

Why?

You can simply assign to df_ops as this is all driver-static data.

-- 
Regards/Gruss,
    Boris.

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