linux-kernel - Re: [RFC 1/1] edac: Add a counter parameter for edac_device_handle

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Date:   Thu, 1 Aug 2019 16:17:01 +0200
From:   Robert Richter <rric@...nel.org>
To:     "Hawa, Hanna" <hhhawa@...zon.com>
Cc:     thor.thayer@...ux.intel.com, bp@...en8.de, mchehab@...nel.org,
        james.morse@....com, morbidrsa@...il.com, ralf@...ux-mips.org,
        david.daney@...ium.com, andy.gross@...aro.org,
        david.brown@...aro.org, ckadabi@...eaurora.org,
        vnkgutta@...eaurora.org, jglauber@...ium.com,
        khuong@...amperecomputing.com, dwmw@...zon.co.uk, benh@...zon.com,
        ronenk@...zon.com, talel@...zon.com, jonnyc@...zon.com,
        hanochu@...zon.com, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [RFC 1/1] edac: Add a counter parameter for
 edac_device_handle_ue/ce()

On 01.08.19 15:29:03, Hawa, Hanna wrote:
> On 8/1/2019 2:35 PM, Robert Richter wrote:
> > On 15.07.19 13:53:07, Hanna Hawa wrote:
> > > Add a counter parameter in order to avoid losing errors count for edac
> > > device, the error count reports the number of errors reported by an edac
> > > device similar to the way MC_EDAC do.
> > > 
> > > Signed-off-by: Hanna Hawa <hhhawa@...zon.com>
> > > ---
> > >   drivers/edac/altera_edac.c      | 20 ++++++++++++--------
> > >   drivers/edac/amd8111_edac.c     |  6 +++---
> > >   drivers/edac/cpc925_edac.c      |  4 ++--
> > >   drivers/edac/edac_device.c      | 18 ++++++++++--------
> > >   drivers/edac/edac_device.h      |  8 ++++++--
> > >   drivers/edac/highbank_l2_edac.c |  4 ++--
> > >   drivers/edac/mpc85xx_edac.c     |  4 ++--
> > >   drivers/edac/mv64x60_edac.c     |  4 ++--
> > >   drivers/edac/octeon_edac-l2c.c  | 20 ++++++++++----------
> > >   drivers/edac/octeon_edac-pc.c   |  6 +++---
> > >   drivers/edac/qcom_edac.c        |  8 ++++----
> > >   drivers/edac/thunderx_edac.c    | 10 +++++-----
> > >   drivers/edac/xgene_edac.c       | 26 +++++++++++++-------------
> > >   13 files changed, 74 insertions(+), 64 deletions(-)
> > 
> > > diff --git a/drivers/edac/edac_device.h b/drivers/edac/edac_device.h
> > > index 1aaba74..cf1a1da 100644
> > > --- a/drivers/edac/edac_device.h
> > > +++ b/drivers/edac/edac_device.h
> > > @@ -290,23 +290,27 @@ extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev);
> > >    *	perform a common output and handling of an 'edac_dev' UE event
> > >    *
> > >    * @edac_dev: pointer to struct &edac_device_ctl_info
> > > + * @error_count: number of errors of the same type
> > >    * @inst_nr: number of the instance where the UE error happened
> > >    * @block_nr: number of the block where the UE error happened
> > >    * @msg: message to be printed
> > >    */
> > >   extern void edac_device_handle_ue(struct edac_device_ctl_info *edac_dev,
> > > -				int inst_nr, int block_nr, const char *msg);
> > > +				  u16 error_count, int inst_nr, int block_nr,
> > > +				  const char *msg);
> > >   /**
> > >    * edac_device_handle_ce():
> > >    *	perform a common output and handling of an 'edac_dev' CE event
> > >    *
> > >    * @edac_dev: pointer to struct &edac_device_ctl_info
> > > + * @error_count: number of errors of the same type
> > >    * @inst_nr: number of the instance where the CE error happened
> > >    * @block_nr: number of the block where the CE error happened
> > >    * @msg: message to be printed
> > >    */
> > >   extern void edac_device_handle_ce(struct edac_device_ctl_info *edac_dev,
> > 
> > How about renaming this to __edac_device_handle_ce() and then have 2
> > macros for:
> > 
> >   * edac_device_handle_ce() to keep old i/f.
> > 
> >   * edac_device_handle_ce_count(), with count parameter added.
> > 
> > Same for uncorrectable errors.
> > 
> > Code of other driver can be kept as it is then.
> 
> Don't you think it'll be confused to have different APIs between EDAC_MC and
> EDAC_DEVICE?
> (in MC the count passed as part of edac_mc_handle_error())

I don't think edac_mc_handle_error() with 11 function arguments is a
good reference for somethin we want to adopt. For the majority of
drivers you just introduce another useless argument with the following
pattern:

	edac_device_handle_ce(edac_dev, 1, 0, 0, edac_dev_name);

IMO, the api should be improved when touching it.

-Robert