linux-kernel - RE: [PATCH v2] EDAC: synopsys: Fix the wrong call of pinf->col parameter

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Message-ID: <AM6PR04MB658495A13744517A6E263D2292F90@AM6PR04MB6584.eurprd04.prod.outlook.com>
Date:   Mon, 16 Mar 2020 01:30:39 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     "mchehab@...nel.org" <mchehab@...nel.org>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "james.morse@....com" <james.morse@....com>,
        "rrichter@...vell.com" <rrichter@...vell.com>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "manish.narani@...inx.com" <manish.narani@...inx.com>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>, Frank Li <frank.li@....com>
Subject: RE: [PATCH v2] EDAC: synopsys: Fix the wrong call of pinf->col
 parameter

Hi Borislav,

> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: 2020年3月16日 3:50
> To: Sherry Sun <sherry.sun@....com>
> Cc: mchehab@...nel.org; tony.luck@...el.com; james.morse@....com;
> rrichter@...vell.com; michal.simek@...inx.com; manish.narani@...inx.com;
> linux-edac@...r.kernel.org; linux-kernel@...r.kernel.org; dl-linux-imx
> <linux-imx@....com>; Frank Li <frank.li@....com>
> Subject: Re: [PATCH v2] EDAC: synopsys: Fix the wrong call of pinf->col
> parameter
> 
> On Fri, Feb 28, 2020 at 10:16:23AM +0800, Sherry Sun wrote:
> > Since ZynqMP platform call zynqmp_get_error_info() function to get
> > ce/ue information. In this function, pinf->col parameter is not used,
> > this parameter is only used by Zynq platforme in
> > zynq_get_error_info(). So here pinf->col should not be called and
> > printed for ZynqMP, need remove it.
> 
> Err, the interrupt handler intr_handler() calls the ->get_error_info() function
> pointer and then calls handle_error(). I.e, the same path ending in
> handle_error() is called on both: Zynq and ZynqMP, one through the
> interrupt and the other through the poller.
> 
> Because it looks like the interrupt support is only on ZynqMP? I'm looking at
> that DDR_ECC_INTR_SUPPORT thing.
> 
> If so, then you need to rename the interrupt handler to
> zynqmp_intr_handler().
> 
> And normal Zynq platform uses check_errors() which then calls
> handle_error().
> 
> So still not good enough: you probably "fixed" it on ZynqMP but broke it on
> Zynq because check_errors() calls ->get_error_info() which is
> zynq_get_error_info() and will have populated pinf->col.
> 
> You need to differentiate between Zynq and ZynqMP in handle_error() and
> issue the proper string depending on the platform.

Maybe you misunderstood the handle_error(), this function has already 
distinguished between Zynq and ZynqMP through priv->p_data->quirks.
And what I am doing in this patch is to remove the useless pinf->col in ZynqMP
part, which won't break the Zynq part.

Thanks
Sherry Sun


> 
> AFAICT.
> 
> --
> Regards/Gruss,
>     Boris.
> 
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