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

Borislav Petkov
2019-08-13T14:59:05Z

> 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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