linux-kernel - Re: [PATCH v4 1/2] EDAC/amd64: Set memory type per DIMM

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Date:   Thu, 24 Feb 2022 18:18:45 +0000
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        mchehab@...nel.org, tony.luck@...el.com, james.morse@....com,
        rric@...nel.org, Smita.KoralahalliChannabasappa@....com,
        william.roche@...cle.com
Subject: Re: [PATCH v4 1/2] EDAC/amd64: Set memory type per DIMM

On Wed, Feb 23, 2022 at 09:55:08PM +0100, Borislav Petkov wrote:
> On Wed, Feb 02, 2022 at 02:43:06PM +0000, Yazen Ghannam wrote:
> > +static void _determine_memory_type_df(struct amd64_umc *umc)
> 
> You don't need this function, right?
> 
> IOW, here's what I've applied:
> 

...

>  
> -static void determine_memory_type(struct amd64_pvt *pvt)
> +static void determine_memory_type_df(struct amd64_pvt *pvt)
>  {
> -	u32 dram_ctrl, dcsm;
> +	struct amd64_umc *umc;
> +	u32 i;
>  
> -	if (pvt->umc) {
> -		if ((pvt->umc[0].dimm_cfg | pvt->umc[1].dimm_cfg) & BIT(5))
> -			pvt->dram_type = MEM_LRDDR4;
> -		else if ((pvt->umc[0].dimm_cfg | pvt->umc[1].dimm_cfg) & BIT(4))
> -			pvt->dram_type = MEM_RDDR4;
> +	for_each_umc(i) {
> +		umc = &pvt->umc[i];
> +
> +		if (!(umc->sdp_ctrl & UMC_SDP_INIT)) {
> +			umc->dram_type = MEM_EMPTY;
> +			continue;
> +		}
> +
> +		if (umc->dimm_cfg & BIT(5))
> +			umc->dram_type = MEM_LRDDR4;
> +		else if (umc->dimm_cfg & BIT(4))
> +			umc->dram_type = MEM_RDDR4;
>  		else
> -			pvt->dram_type = MEM_DDR4;
> -		return;
> +			umc->dram_type = MEM_DDR4;
> +
> +		edac_dbg(1, "  UMC%d DIMM type: %s\n", i, edac_mem_types[umc->dram_type]);
>  	}
> +}

Ah, I see. You got rid of the extra helper function. Makes sense and looks
okay to me.

Thanks,
Yazen