Re: [PATCH 3/3] edac: sifive: Add EDAC support for Memory Controller in SiFive SoCs

[Borislav Petkov]

> Subject: Re: [PATCH 3/3] edac: sifive: Add EDAC support for Memory Controller in SiFive SoCs

Fix subject prefix: "EDAC/sifive: ..."

On Tue, Aug 25, 2020 at 05:36:22PM +0530, Yash Shah wrote:
> Add Memory controller EDAC support in exisiting SiFive platform EDAC

s/in exisiting/to the/

> driver. It registers for notifier events from the SiFive DDR controller
> driver for DDR ECC events.

Simplify:

"It registers for ECC notifier events from the memory controller."

> Signed-off-by: Yash Shah <yash.shah@xxxxxxxxxx>
> ---
>  drivers/edac/Kconfig       |   2 +-
>  drivers/edac/sifive_edac.c | 117 +++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 118 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> index 7b6ec30..f8b3b53 100644
> --- a/drivers/edac/Kconfig
> +++ b/drivers/edac/Kconfig
> @@ -462,7 +462,7 @@ config EDAC_ALTERA_SDMMC
>  
>  config EDAC_SIFIVE
>  	bool "Sifive platform EDAC driver"
> -	depends on EDAC=y && SIFIVE_L2
> +	depends on EDAC=y && (SIFIVE_L2 || SIFIVE_DDR)
>  	help
>  	  Support for error detection and correction on the SiFive SoCs.
>  
> diff --git a/drivers/edac/sifive_edac.c b/drivers/edac/sifive_edac.c
> index 3a3dcb1..cf032685 100644
> --- a/drivers/edac/sifive_edac.c
> +++ b/drivers/edac/sifive_edac.c
> @@ -11,14 +11,120 @@
>  #include <linux/platform_device.h>
>  #include "edac_module.h"
>  #include <soc/sifive/sifive_l2_cache.h>
> +#include <soc/sifive/sifive_ddr.h>
>  
>  #define DRVNAME "sifive_edac"
> +#define SIFIVE_EDAC_MOD_NAME "Sifive ECC Manager"

s/SIFIVE_EDAC_MOD_NAME/EDAC_MOD_NAME/g

like the other EDAC drivers.

...

> +static int ecc_mc_register(struct platform_device *pdev)
> +{
> +	struct sifive_edac_mc_priv *p;
> +	struct edac_mc_layer layers[1];
> +	int ret;
> +
> +	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
> +	if (!p)
> +		return -ENOMEM;
> +
> +	p->notifier.notifier_call = ecc_mc_err_event;
> +	platform_set_drvdata(pdev, p);
> +
> +	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
> +	layers[0].size = 1;
> +	layers[0].is_virt_csrow = true;
> +
> +	p->mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, 0);
> +	if (!p->mci) {
> +		dev_err(&pdev->dev, "Failed mem allocation for mc instance\n");
> +		return -ENOMEM;
> +	}
> +
> +	p->mci->pdev = &pdev->dev;
> +	/* Initialize controller capabilities */
> +	p->mci->mtype_cap = MEM_FLAG_DDR4;
> +	p->mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
> +	p->mci->edac_cap = EDAC_FLAG_SECDED;
> +	p->mci->scrub_cap = SCRUB_UNKNOWN;
> +	p->mci->scrub_mode = SCRUB_HW_PROG;
> +	p->mci->ctl_name = dev_name(&pdev->dev);
> +	p->mci->dev_name = dev_name(&pdev->dev);
> +	p->mci->mod_name = SIFIVE_EDAC_MOD_NAME;
> +	p->mci->ctl_page_to_phys = NULL;
> +
> +	/* Interrupt feature is supported by cadence mc */
> +	edac_op_state = EDAC_OPSTATE_INT;
> +
> +	ret = edac_mc_add_mc(p->mci);
> +	if (ret) {
> +		edac_printk(KERN_ERR, SIFIVE_EDAC_MOD_NAME,
> +			    "Failed to register with EDAC core\n");
> +		goto err;
> +	}
> +
> +#ifdef CONFIG_SIFIVE_DDR

It seems all that ifdeffery can be replaced with

	if (IS_ENABLED(CONFIG_...))

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette