linux-kernel - Re: [PATCH] EDAC/qcom: Make irq configuration optional

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Message-ID: <20240903082720.zcln2da4y6kxju5g@thinkpad>
Date: Tue, 3 Sep 2024 13:57:20 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Rajendra Nayak <quic_rjendra@...cinc.com>, bp@...en8.de,
	tony.luck@...el.com, mchehab@...nel.org, rric@...nel.org,
	andersson@...nel.org, konradybcio@...nel.org,
	quic_sibis@...cinc.com, linux-arm-msm@...r.kernel.org,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] EDAC/qcom: Make irq configuration optional

On Tue, Sep 03, 2024 at 11:21:10AM +0300, Abel Vesa wrote:
> On 24-09-03 11:31:38, Rajendra Nayak wrote:
> > On most modern qualcomm SoCs, the configuration necessary to enable the
> > Tag/Data RAM realted irqs being propagated to the SoC irq controller is
> 
> Nitpick: s/realted/related/
> 
> > already done in firmware (in DSF or 'DDR System Firmware')
> > 
> > On some like the x1e80100, these registers aren't even accesible to the
> > kernel causing a crash when edac device is probed.
> > 
> > Hence, make the irq configuration optional in the driver and mark x1e80100
> > as the SoC on which this should be avoided.
> > 
> > Fixes: af16b00578a7 ("arm64: dts: qcom: Add base X1E80100 dtsi and the QCP dts")
> 
> Not sure about this fixes tag though.
> 

Because, this commit introduced LLCC node which triggers the probe of the EDAC
driver leading to the crash.

- Mani

> > Reported-by: Bjorn Andersson <andersson@...nel.org>
> > Signed-off-by: Rajendra Nayak <quic_rjendra@...cinc.com>
> > ---
> >  drivers/edac/qcom_edac.c           | 8 +++++---
> >  drivers/soc/qcom/llcc-qcom.c       | 3 +++
> >  include/linux/soc/qcom/llcc-qcom.h | 2 ++
> >  3 files changed, 10 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/edac/qcom_edac.c b/drivers/edac/qcom_edac.c
> > index d3cd4cc54ace..96611ca09ac5 100644
> > --- a/drivers/edac/qcom_edac.c
> > +++ b/drivers/edac/qcom_edac.c
> > @@ -342,9 +342,11 @@ static int qcom_llcc_edac_probe(struct platform_device *pdev)
> >  	int ecc_irq;
> >  	int rc;
> >  
> > -	rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
> > -	if (rc)
> > -		return rc;
> > +	if (!llcc_driv_data->ecc_irq_configured) {
> > +		rc = qcom_llcc_core_setup(llcc_driv_data, llcc_driv_data->bcast_regmap);
> > +		if (rc)
> > +			return rc;
> > +	}
> >  
> >  	/* Allocate edac control info */
> >  	edev_ctl = edac_device_alloc_ctl_info(0, "qcom-llcc", 1, "bank",
> > diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
> > index 8fa4ffd3a9b5..b1c0ae9991d6 100644
> > --- a/drivers/soc/qcom/llcc-qcom.c
> > +++ b/drivers/soc/qcom/llcc-qcom.c
> > @@ -139,6 +139,7 @@ struct qcom_llcc_config {
> >  	int size;
> >  	bool need_llcc_cfg;
> >  	bool no_edac;
> > +	bool irq_configured;
> >  };
> >  
> >  struct qcom_sct_config {
> > @@ -718,6 +719,7 @@ static const struct qcom_llcc_config x1e80100_cfg[] = {
> >  		.need_llcc_cfg	= true,
> >  		.reg_offset	= llcc_v2_1_reg_offset,
> >  		.edac_reg_offset = &llcc_v2_1_edac_reg_offset,
> > +		.irq_configured = true,
> >  	},
> >  };
> >  
> > @@ -1345,6 +1347,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
> >  	drv_data->cfg = llcc_cfg;
> >  	drv_data->cfg_size = sz;
> >  	drv_data->edac_reg_offset = cfg->edac_reg_offset;
> > +	drv_data->ecc_irq_configured = cfg->irq_configured;
> >  	mutex_init(&drv_data->lock);
> >  	platform_set_drvdata(pdev, drv_data);
> >  
> > diff --git a/include/linux/soc/qcom/llcc-qcom.h b/include/linux/soc/qcom/llcc-qcom.h
> > index 9e9f528b1370..acad1f4cf854 100644
> > --- a/include/linux/soc/qcom/llcc-qcom.h
> > +++ b/include/linux/soc/qcom/llcc-qcom.h
> > @@ -125,6 +125,7 @@ struct llcc_edac_reg_offset {
> >   * @num_banks: Number of llcc banks
> >   * @bitmap: Bit map to track the active slice ids
> >   * @ecc_irq: interrupt for llcc cache error detection and reporting
> > + * @ecc_irq_configured: 'True' if firmware has already configured the irq propagation
> >   * @version: Indicates the LLCC version
> >   */
> >  struct llcc_drv_data {
> > @@ -139,6 +140,7 @@ struct llcc_drv_data {
> >  	u32 num_banks;
> >  	unsigned long *bitmap;
> >  	int ecc_irq;
> > +	bool ecc_irq_configured;
> >  	u32 version;
> >  };
> >  
> > -- 
> > 2.34.1
> > 

-- 
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