Re: [PATCH v2 13/13] qcom: llcc/edac: Support polling mode for ECC handling

[Manivannan Sadhasivam]

On Mon, Dec 12, 2022 at 04:53:49PM +0100, Luca Weiss wrote:
> Hi Manivannan,
> 
> On Mon Dec 12, 2022 at 1:33 PM CET, Manivannan Sadhasivam wrote:
> > Not all Qcom platforms support IRQ mode for ECC handling. For those
> > platforms, the current EDAC driver will not be probed due to missing ECC
> > IRQ in devicetree.
> >
> > So add support for polling mode so that the EDAC driver can be used on all
> > Qcom platforms supporting LLCC.
> >
> > The polling delay of 5000ms is chosed based on Qcom downstream/vendor
> > driver.
> 
> I think it does work for me on SM6350, I get this in dmesg:
> 
> [    0.054608] EDAC MC: Ver: 3.0.0
> [    0.273913] EDAC DEVICE0: Giving out device to module qcom_llcc_edac controller llcc: DEV qcom_llcc_edac (POLLED)
> 
> What I've noticed though is that the 5000ms poll you defined in the
> driver doesn't seem to be reflected at runtime? Or am I looking at
> different things?
> 
> / # cat /sys/devices/system/edac/qcom-llcc/poll_msec 
> 1000
> 

Oops... Looks like the interval is hardcoded in edac_device driver:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/edac/edac_device.c#n449

This clearly needs to be fixed. Will do so in next version.

Thanks a lot for testing the series. I will also consider this as your t-b tag
for SM6350 and driver patches.

Thanks,
Mani

> Regards
> Luca
> 
> >
> > Reported-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> > ---
> >  drivers/edac/qcom_edac.c     | 37 +++++++++++++++++++++++++-----------
> >  drivers/soc/qcom/llcc-qcom.c | 13 ++++++-------
> >  2 files changed, 32 insertions(+), 18 deletions(-)
> >
> > diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
> > index 5be93577fc03..f7afb5375293 100644
> > --- a/drivers/edac/qcom_edac.c
> > +++ b/drivers/edac/qcom_edac.c
> > @@ -76,6 +76,8 @@
> >  #define DRP0_INTERRUPT_ENABLE           BIT(6)
> >  #define SB_DB_DRP_INTERRUPT_ENABLE      0x3
> >  
> > +#define ECC_POLL_MSEC			5000
> > +
> >  enum {
> >  	LLCC_DRAM_CE = 0,
> >  	LLCC_DRAM_UE,
> > @@ -283,8 +285,7 @@ dump_syn_reg(struct edac_device_ctl_info *edev_ctl, int err_type, u32 bank)
> >  	return ret;
> >  }
> >  
> > -static irqreturn_t
> > -llcc_ecc_irq_handler(int irq, void *edev_ctl)
> > +static irqreturn_t llcc_ecc_irq_handler(int irq, void *edev_ctl)
> >  {
> >  	struct edac_device_ctl_info *edac_dev_ctl = edev_ctl;
> >  	struct llcc_drv_data *drv = edac_dev_ctl->pvt_info;
> > @@ -328,6 +329,11 @@ llcc_ecc_irq_handler(int irq, void *edev_ctl)
> >  	return irq_rc;
> >  }
> >  
> > +static void llcc_ecc_check(struct edac_device_ctl_info *edev_ctl)
> > +{
> > +	llcc_ecc_irq_handler(0, edev_ctl);
> > +}
> > +
> >  static int qcom_llcc_edac_probe(struct platform_device *pdev)
> >  {
> >  	struct llcc_drv_data *llcc_driv_data = pdev->dev.platform_data;
> > @@ -356,22 +362,31 @@ static int qcom_llcc_edac_probe(struct platform_device *pdev)
> >  	edev_ctl->panic_on_ue = LLCC_ERP_PANIC_ON_UE;
> >  	edev_ctl->pvt_info = llcc_driv_data;
> >  
> > +	/* Check if LLCC driver has passed ECC IRQ */
> > +	ecc_irq = llcc_driv_data->ecc_irq;
> > +	if (ecc_irq > 0) {
> > +		/* Use interrupt mode if IRQ is available */
> > +		edac_op_state = EDAC_OPSTATE_INT;
> > +	} else {
> > +		/* Fall back to polling mode otherwise */
> > +		edac_op_state = EDAC_OPSTATE_POLL;
> > +		edev_ctl->poll_msec = ECC_POLL_MSEC;
> > +		edev_ctl->edac_check = llcc_ecc_check;
> > +	}
> > +
> >  	rc = edac_device_add_device(edev_ctl);
> >  	if (rc)
> >  		goto out_mem;
> >  
> >  	platform_set_drvdata(pdev, edev_ctl);
> >  
> > -	/* Request for ecc irq */
> > -	ecc_irq = llcc_driv_data->ecc_irq;
> > -	if (ecc_irq < 0) {
> > -		rc = -ENODEV;
> > -		goto out_dev;
> > -	}
> > -	rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
> > +	/* Request ECC IRQ if available */
> > +	if (ecc_irq > 0) {
> > +		rc = devm_request_irq(dev, ecc_irq, llcc_ecc_irq_handler,
> >  			      IRQF_TRIGGER_HIGH, "llcc_ecc", edev_ctl);
> > -	if (rc)
> > -		goto out_dev;
> > +		if (rc)
> > +			goto out_dev;
> > +	}
> >  
> >  	return rc;
> >  
> > diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> > index a29f22dad7fa..e044e6756415 100644
> > --- a/drivers/soc/qcom/llcc-qcom.c
> > +++ b/drivers/soc/qcom/llcc-qcom.c
> > @@ -1011,13 +1011,12 @@ static int qcom_llcc_probe(struct platform_device *pdev)
> >  		goto err;
> >  
> >  	drv_data->ecc_irq = platform_get_irq_optional(pdev, 0);
> > -	if (drv_data->ecc_irq >= 0) {
> > -		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");
> > -	}
> > +
> > +	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 0;
> >  err:
> > -- 
> > 2.25.1
> 

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