linux-kernel - Re: [PATCH v1 2/4] drivers: soc: Add support to register LLCC EDAC driver

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Date:   Fri, 10 Aug 2018 10:21:14 -0700
From:   Evan Green <evgreen@...omium.org>
To:     vnkgutta@...eaurora.org
Cc:     robh@...nel.org, mchehab@...nel.org, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, tsoni@...eaurora.org,
        ckadabi@...eaurora.org, rishabhb@...eaurora.org, bp@...en8.de
Subject: Re: [PATCH v1 2/4] drivers: soc: Add support to register LLCC EDAC driver

On Wed, Aug 1, 2018 at 1:33 PM Venkata Narendra Kumar Gutta
<vnkgutta@...eaurora.org> wrote:
>
> Cache error reporting controller is to detect and report single
> and double bit errors on Last Level Cache Controller (LLCC) cache.
> Add required support to register LLCC EDAC driver as platform driver,
> from LLCC driver.
>
> Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@...eaurora.org>
> ---
>  drivers/soc/qcom/llcc-slice.c      | 18 ++++++++++++++++--
>  include/linux/soc/qcom/llcc-qcom.h |  2 ++
>  2 files changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
> index a63640d..09c8bb0 100644
> --- a/drivers/soc/qcom/llcc-slice.c
> +++ b/drivers/soc/qcom/llcc-slice.c
> @@ -224,7 +224,7 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev)
>         u32 attr0_val;
>         u32 max_cap_cacheline;
>         u32 sz;
> -       int ret;
> +       int ret = 0;
>         const struct llcc_slice_config *llcc_table;
>         struct llcc_slice_desc desc;
>
> @@ -282,6 +282,7 @@ int qcom_llcc_probe(struct platform_device *pdev,
>         struct resource *llcc_banks_res, *llcc_bcast_res;
>         void __iomem *llcc_banks_base, *llcc_bcast_base;
>         int ret, i;
> +       struct platform_device *llcc_edac;
>
>         drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
>         if (!drv_data)
> @@ -341,6 +342,19 @@ int qcom_llcc_probe(struct platform_device *pdev,
>         mutex_init(&drv_data->lock);
>         platform_set_drvdata(pdev, drv_data);
>
> -       return qcom_llcc_cfg_program(pdev);
> +       ret = qcom_llcc_cfg_program(pdev);
> +       if (ret)
> +               return ret;
> +
> +       drv_data->ecc_irq = platform_get_irq(pdev, 0);
> +       if (drv_data->ecc_irq >= 0) {

This condition will always be true for u32. See below...

> +               llcc_edac = platform_device_register_data(&pdev->dev,
> +                                               "qcom_llcc_edac", -1, drv_data,
> +                                               sizeof(*drv_data));
> +               if (IS_ERR(llcc_edac))
> +                       dev_err(dev, "Failed to register llcc edac driver\n");
> +       }
> +
> +       return ret;
>  }
>  EXPORT_SYMBOL_GPL(qcom_llcc_probe);
> diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> index c681e79..1a3bc25 100644
> --- a/include/linux/soc/qcom/llcc-qcom.h
> +++ b/include/linux/soc/qcom/llcc-qcom.h
> @@ -78,6 +78,7 @@ struct llcc_slice_config {
>   * @num_banks: Number of llcc banks
>   * @bitmap: Bit map to track the active slice ids
>   * @offsets: Pointer to the bank offsets array
> + * @ecc_irq: interrupt for llcc cache error detection and reporting
>   */
>  struct llcc_drv_data {
>         struct regmap *regmap;
> @@ -89,6 +90,7 @@ struct llcc_drv_data {
>         u32 num_banks;
>         unsigned long *bitmap;
>         u32 *offsets;
> +       u32 ecc_irq;

The return type for platform_get_irq is int, so this should probably
be int, or "unsigned", but then you'd need to fix your logic above.

>  };
>
>  #if IS_ENABLED(CONFIG_QCOM_LLCC)
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>