linux-kernel - Re: [PATCH 4/4] hwmon: (occ) Add soft minimum power cap attribute

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Date:   Mon, 21 Feb 2022 07:39:33 +0000
From:   Joel Stanley <joel@....id.au>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-hwmon@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 4/4] hwmon: (occ) Add soft minimum power cap attribute

On Wed, 16 Feb 2022 at 20:09, Eddie James <eajames@...ux.ibm.com> wrote:
>
>
> On 2/16/22 00:33, Joel Stanley wrote:
> > On Tue, 15 Feb 2022 at 15:11, Eddie James <eajames@...ux.ibm.com> wrote:
> >> Export the power caps data for the soft minimum power cap through hwmon.
> >>
> >> Signed-off-by: Eddie James <eajames@...ux.ibm.com>
> >> ---
> >>   drivers/hwmon/occ/common.c | 19 ++++++++++++++++---
> >>   1 file changed, 16 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
> >> index 0cb4a0a6cbc1..f00cd59f1d19 100644
> >> --- a/drivers/hwmon/occ/common.c
> >> +++ b/drivers/hwmon/occ/common.c
> >> @@ -674,6 +674,9 @@ static ssize_t occ_show_caps_3(struct device *dev,
> >>          case 7:
> >>                  val = caps->user_source;
> >>                  break;
> >> +       case 8:
> >> +               val = get_unaligned_be16(&caps->soft_min) * 1000000ULL;
> >> +               break;
> >>          default:
> >>                  return -EINVAL;
> >>          }
> >> @@ -835,12 +838,13 @@ static int occ_setup_sensor_attrs(struct occ *occ)
> >>          case 1:
> >>                  num_attrs += (sensors->caps.num_sensors * 7);
> >>                  break;
> >> -       case 3:
> >> -               show_caps = occ_show_caps_3;
> >> -               fallthrough;
> >>          case 2:
> >>                  num_attrs += (sensors->caps.num_sensors * 8);
> >>                  break;
> >> +       case 3:
> >> +               show_caps = occ_show_caps_3;
> >> +               num_attrs += (sensors->caps.num_sensors * 9);
> > How do we know this changed from 8 to 9?
>
>
> Well we made the structure change a while back when adding P10 support,
> but didn't bother to export the "soft min" field. Now it's needed.
>
>
> >
> > We should start adding links to the occ source code, or a similar
> > reference, when making these changes so they can be reviewed.
>
>
> I would but it doesn't appear to be public for P10 yet... at least, no
> one has updated the P9 OCC spec hosted in the open-power repo:
> https://github.com/open-power/docs

Ok. Lets follow that up internally. For this patch:

Reviewed-by: Joel Stanley <joel@....id.au>

Cheers,

Joel