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 16:04:36 -0700
From:   vnkgutta@...eaurora.org
To:     Evan Green <evgreen@...omium.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 2018-08-10 10:21, Evan Green wrote:
> 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...
That's true. I missed that.
> 
>> +               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.
I think we should keep that as int. I'll check on which one I'm supposed 
to use here and update in the next version.
> 
>>  };
>> 
>>  #if IS_ENABLED(CONFIG_QCOM_LLCC)
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
>> a Linux Foundation Collaborative Project
>>