linux-kernel - Re: [RESEND PATCH] memory: Freescale CoreNet Coherency Fabric error reporting driver

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Message-ID: <1401900111.6603.325.camel@snotra.buserror.net>
Date:	Wed, 4 Jun 2014 11:41:51 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Bhushan Bharat-R65777 <Bharat.Bhushan@...escale.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH] memory: Freescale CoreNet Coherency Fabric error
 reporting driver

On Wed, 2014-06-04 at 03:17 -0500, Bhushan Bharat-R65777 wrote:
> > +struct ccf_err_regs {
> > +	u32 errdet;		/* 0x00 Error Detect Register */
> > +	/* 0x04 Error Enable (ccf1)/Disable (ccf2) Register */
> > +	u32 errdis;
> > +	/* 0x08 Error Interrupt Enable Register (ccf2 only) */
> > +	u32 errinten;
> > +	u32 cecar;		/* 0x0c Error Capture Attribute Register */
> > +	u32 cecadrh;		/* 0x10 Error Capture Address High */
> 
> s/cecadrh/cecaddrh/g
> This way we will be consistent with Reference manual.

It's "cecadrh" in ccf1 and "cecaddrh" in ccf2.  I suppose I should use
the latter since "errdet/errdis/errinten" are the ccf2 names.

> > +	u32 cecadrl;		/* 0x14 Error Capture Address Low */
> 
> s/cecadrl/cecaddrl/g
> 
> > +	u32 cecar2;		/* 0x18 Error Capture Attribute Register 2 */
> > +};
> > +
> > +/* LAE/CV also valid for errdis and errinten */
> > +#define ERRDET_LAE		(1 << 0)  /* Local Access Error */
> > +#define ERRDET_CV		(1 << 1)  /* Coherency Violation */
> > +#define ERRDET_CTYPE_SHIFT	26	  /* Capture Type (ccf2 only) */
> > +#define ERRDET_CTYPE_MASK	(0x3f << ERRDET_CTYPE_SHIFT)
> 
> Should not this be (0x1f << ERRDET_CTYPE_SHIFT)

Yes, thanks for catching that.

> > +#define ERRDET_CAP		(1 << 31) /* Capture Valid (ccf2 only) */
> > +
> > +#define CECAR_VAL		(1 << 0)  /* Valid (ccf1 only) */
> > +#define CECAR_UVT		(1 << 15) /* Unavailable target ID (ccf1) */
> > +#define CECAR_SRCID_SHIFT_CCF1	24
> > +#define CECAR_SRCID_MASK_CCF1	(0xff << CECAR_SRCID_SHIFT_CCF1)
> > +#define CECAR_SRCID_SHIFT_CCF2	18
> > +#define CECAR_SRCID_MASK_CCF2	(0xff << CECAR_SRCID_SHIFT_CCF2)
> > +
> > +#define CECADRH_ADDRH		0xf
> 
> On ccf2 this id 0xff.

OK.  I think we can get away with using 0xff on both.

> > +static int ccf_remove(struct platform_device *pdev) {
> > +	struct ccf_private *ccf = dev_get_drvdata(&pdev->dev);
> > +
> > +	switch (ccf->info->version) {
> > +	case CCF1:
> > +		iowrite32be(0, &ccf->err_regs->errdis);
> > +		break;
> > +
> > +	case CCF2:
> > +		iowrite32be(0, &ccf->err_regs->errinten);
> 
> Do you think it is same to disable detection bits in ccf->err_regs->errdis?

Disabling the interrupt is what we're aiming for here, but ccf1 doesn't
provide a way to do that separate from disabling detection.

-Scott


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