linux-kernel - Re: [PATCH v2 06/24] EDAC: Kill EDAC_DIMM

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Date:   Tue, 13 Aug 2019 16:59:47 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Robert Richter <rrichter@...vell.com>
Cc:     James Morse <james.morse@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Jason Baron <jbaron@...mai.com>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
        Tero Kristo <t-kristo@...com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/24] EDAC: Kill EDAC_DIMM_PTR() macro


> Subject: Re: [PATCH v2 06/24] EDAC: Kill EDAC_DIMM_PTR() macro

s/Kill/Replace ... with/

On Mon, Jun 24, 2019 at 03:09:06PM +0000, Robert Richter wrote:
> Get rid of this macro and instead use the new function
> edac_get_dimm(). Also introduce the edac_get_dimm_by_index() function
> for later use.

Some blurb about *why* you're doing this won't hurt here.

> diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
> index bd3be25d0d3f..8050f9577fe6 100644
> --- a/drivers/edac/ghes_edac.c
> +++ b/drivers/edac/ghes_edac.c
> @@ -97,9 +97,8 @@ static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg)
>  
>  	if (dh->type == DMI_ENTRY_MEM_DEVICE) {
>  		struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh;
> -		struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
> -						       mci->n_layers,
> -						       dimm_fill->count, 0, 0);
> +		struct dimm_info *dimm = edac_get_dimm(mci, dimm_fill->count,
> +						       0, 0);

You can let it stick out.

>  		u16 rdr_mask = BIT(7) | BIT(13);
>  
>  		if (entry->size == 0xffff) {

...

> diff --git a/drivers/edac/i5400_edac.c b/drivers/edac/i5400_edac.c
> index 6f8bcdb9256a..a50a8707337b 100644
> --- a/drivers/edac/i5400_edac.c
> +++ b/drivers/edac/i5400_edac.c
> @@ -1196,8 +1196,8 @@ static int i5400_init_dimms(struct mem_ctl_info *mci)
>  			if (!MTR_DIMMS_PRESENT(mtr))
>  				continue;
>  
> -			dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, mci->n_layers,
> -				       channel / 2, channel % 2, slot);
> +			dimm = edac_get_dimm(mci, channel / 2, channel % 2,
> +					     slot);

Also, let it stick out.

> @@ -669,4 +639,56 @@ struct mem_ctl_info {
>  	bool fake_inject_ue;
>  	u16 fake_inject_count;
>  };
> +
> +/**
> + * edac_get_dimm_by_index - Get DIMM info from a memory controller
> + *                          given by an index
> + *
> + * @mci:	a struct mem_ctl_info
> + * @index:	index in the memory controller's DIMM array
> + *
> + * Returns a struct dimm_info*.

or NULL on failure.

> + */
> +static inline struct dimm_info *
> +edac_get_dimm_by_index(struct mem_ctl_info *mci, int index)
> +{
> +	if (index < 0 || index >= mci->tot_dimms)
> +		return NULL;
> +
> +	if (WARN_ON_ONCE(mci->dimms[index]->idx != index))
> +		return NULL;
> +
> +	return mci->dimms[index];
> +}
> +
> +/**
> + * edac_get_dimm - Get DIMM info from a memory controller given by
> + *                 [layer0,layer1,layer2] position
> + *
> + * @mci:	a struct mem_ctl_info
> + * @layer0:	layer0 position
> + * @layer1:	layer1 position. Unused if n_layers < 2
> + * @layer2:	layer2 position. Unused if n_layers < 3
> + *
> + * For 1 layer, this macro returns "dimms[layer0]";

macro? Copy-paste I guess :)

Below too.

> + *
> + * For 2 layers, this macro is similar to allocate a bi-dimensional array
> + * and to return "dimms[layer0][layer1]";
> + *
> + * For 3 layers, this macro is similar to allocate a tri-dimensional array
> + * and to return "dimms[layer0][layer1][layer2]";
> + */
> +static inline struct dimm_info *
> +edac_get_dimm(struct mem_ctl_info *mci, int layer0, int layer1, int layer2)
> +{
> +	int index = layer0;
> +
> +	if (index >= 0 && mci->n_layers > 1)

Can layer0 be negative here to warrant that check?

> +		index = index * mci->layers[1].size + layer1;
> +	if (index >= 0 && mci->n_layers > 2)

Same here.

> +		index = index * mci->layers[2].size + layer2;
> +
> +	return edac_get_dimm_by_index(mci, index);
> +}
> +
>  #endif
> -- 

Thx.

-- 
Regards/Gruss,
    Boris.

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