linux-kernel - Re: [PATCH v6 2/2] soc: amazon: al-pos-edac: Introduce Amazon's Annapurna Labs POS EDAC driver

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Message-ID: <e80b86e1-861e-1497-8f2b-0269aa9865ad@amazon.com>
Date:   Wed, 23 Oct 2019 17:55:07 +0300
From:   "Shenhar, Talel" <talel@...zon.com>
To:     James Morse <james.morse@....com>
CC:     <robh+dt@...nel.org>, <maz@...nel.org>, <mark.rutland@....com>,
        <arnd@...db.de>, <bp@...en8.de>, <mchehab@...nel.org>,
        <davem@...emloft.net>, <gregkh@...uxfoundation.org>,
        <paulmck@...ux.ibm.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-edac@...r.kernel.org>,
        <dwmw@...zon.co.uk>, <benh@...nel.crashing.org>,
        <hhhawa@...zon.com>, <ronenk@...zon.com>, <jonnyc@...zon.com>,
        <hanochu@...zon.com>, <amirkl@...zon.com>, <barakw@...zon.com>
Subject: Re: [PATCH v6 2/2] soc: amazon: al-pos-edac: Introduce Amazon's
 Annapurna Labs POS EDAC driver


On 10/21/2019 7:42 PM, James Morse wrote:
> Hi Talel,
>
> On 10/10/2019 12:41, Talel Shenhar wrote:
>> The Amazon's Annapurna Labs SoCs includes Point Of Serialization error
>> logging unit that reports an error in case write error (e.g . Attempt to
> (This is tricky to parse. "error in case write error" -> "error when a write error occurs"?)
ack
>
>> write to a read only register).
>> This error shall be reported to EDAC subsystem as uncorrectable-error.
>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 55199ef..a77d554 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -757,6 +757,13 @@ F:	drivers/tty/serial/altera_jtaguart.c
>>   F:	include/linux/altera_uart.h
>>   F:	include/linux/altera_jtaguart.h
>>   
>> +AMAZON ANNAPURNA LABS POS EDAC DRIVER
>> +M:	Talel Shenhar <talel@...zon.com>
>> +M:	Talel Shenhar <talelshenhar@...il.com>
>> +S:	Maintained
>> +F:	Documentation/devicetree/bindings/edac/amazon,al-pos-edac.yaml
>> +F:	drivers/edac/al-pos-edac.c
> ~s/-/_/
ack
>
>
>> diff --git a/drivers/edac/al_pos_edac.c b/drivers/edac/al_pos_edac.c
>> new file mode 100644
>> index 00000000..a85ab67
>> --- /dev/null
>> +++ b/drivers/edac/al_pos_edac.c
>> @@ -0,0 +1,173 @@
>> +static int al_pos_handle(struct al_pos_edac *al_pos)
>> +{
>> +	log1 = readl_relaxed(al_pos->mmio_base + AL_POS_ERROR_LOG_1);
>> +	if (!FIELD_GET(AL_POS_ERROR_LOG_1_VALID, log1))
>> +		return 0;
> [...]
>
>> +	edac_device_handle_ue(al_pos->edac_dev, 0, 0, msg);
>> +
>> +	return 1;
>> +}
> [...]
>
>> +static irqreturn_t al_pos_irq_handler(int irq, void *info)
>> +{
>> +	if (al_pos_handle(al_pos))
>> +		return IRQ_HANDLED;
>> +	return IRQ_NONE;
>> +}
>
>> +static int al_pos_probe(struct platform_device *pdev)
>> +{
>> +	struct edac_device_ctl_info *edac_dev;
>> +	struct al_pos_edac *al_pos;
>> +	int ret;
>> +
>> +	edac_dev = edac_device_alloc_ctl_info(sizeof(*al_pos), DRV_NAME, 1,
>> +					      DRV_NAME, 1, 0, NULL, 0,
>> +					      edac_device_alloc_index());
>> +	if (!edac_dev)
>> +		return -ENOMEM;
>> +
>> +	al_pos = edac_dev->pvt_info;
>> +	al_pos->edac_dev = edac_dev;
>> +	platform_set_drvdata(pdev, al_pos);
>> +
>> +	al_pos->mmio_base = devm_platform_ioremap_resource(pdev, 0);
>> +	if (IS_ERR(al_pos->mmio_base)) {
>> +		dev_err(&pdev->dev, "failed to ioremap memory (%ld)\n",
>> +			PTR_ERR(al_pos->mmio_base));
> edac_device_free_ctl_info(al_pos->edac_dev) or goto err_free_edac ?
ack, shall add managed handling using devm
>
>> +		return PTR_ERR(al_pos->mmio_base);
>> +	}
>> +
>> +	al_pos->irq = platform_get_irq(pdev, 0);
>> +	if (al_pos->irq <= 0)
>> +		edac_dev->edac_check = al_pos_edac_check;
>> +
>> +	edac_dev->dev = &pdev->dev;
>> +	edac_dev->mod_name = DRV_NAME;
>> +	edac_dev->dev_name = dev_name(&pdev->dev);
>> +	edac_dev->ctl_name = "POS";
> Does this show up in sysfs? The 'AL_' prefix may make it easier to find the corresponding
> driver. (The TLA space is a little crowded!)
ack
>
>
>> +	ret = edac_device_add_device(edac_dev);
>> +	if (ret) {
>> +		dev_err(&pdev->dev, "Failed to add edac device\n");
>> +		goto err_free_edac;
>> +	}
>> +
>> +	if (al_pos->irq > 0) {
>> +		ret = devm_request_irq(&pdev->dev,
>> +				       al_pos->irq,
>> +				       al_pos_irq_handler,
>> +				       0,
> Can this be IRQF_SHARED? This lets other devices register the interrupt too, which is
> easily allowed if you can identify whether your device has triggered the interrupt. (which
> you are already doing with the valid bit in your log1 register).
ack
>
>
>> +				       pdev->name,
>> +				       pdev);
>> +		if (ret != 0) {
>> +			dev_err(&pdev->dev,
>> +				"failed to register to irq %d (%d)\n",
>> +				al_pos->irq, ret);
>> +			goto err_remove_edac;
>> +		}
>> +	}
>> +
>> +	return 0;
>> +
>> +err_remove_edac:
>> +	edac_device_del_device(edac_dev->dev);
>> +err_free_edac:
>> +	edac_device_free_ctl_info(edac_dev);
>> +
>> +	return ret;
>> +}
>
> With the edac_dev-leak fixed and the -/_ in MAINTAINERS:
>
> Reviewed-by: James Morse <james.morse@....com>
thanks. shall post v7 with the fixes
>
>
> Thanks,
>
> James