linux-kernel - Re: [PATCH 2/2] hwmon: (dimmtemp) Add Sapphire Rappids support

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Message-ID: <CABqG17iNH7tzs4GqJKu=Wd+nq3e03zjrJMKOcrd9eGpBf0aRWw@mail.gmail.com>
Date:   Tue, 11 Jul 2023 17:06:30 +0200
From:   Naresh Solanki <naresh.solanki@...ements.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     devicetree@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Iwona Winiarska <iwona.winiarska@...el.com>,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        Patrick Rudolph <patrick.rudolph@...ements.com>
Subject: Re: [PATCH 2/2] hwmon: (dimmtemp) Add Sapphire Rappids support

Hi Guenter,

On Mon, 10 Jul 2023 at 20:48, Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Mon, Jul 10, 2023 at 06:47:04PM +0200, Naresh Solanki wrote:
> > From: Patrick Rudolph <patrick.rudolph@...ements.com>
> >
> > This patch extends the functionality of the hwmon (dimmtemp) to include
> > support for Sapphire Rappids platform.
> >
> > Sapphire Rappids can accommodate up to 8 CPUs, each with 16 DIMMs. To
> > accommodate this configuration, the maximum supported DIMM count is
> > increased, and the corresponding Sapphire Rappids ID and threshold code
> > are added.
> >
> > The patch has been tested on a 4S system with 64 DIMMs installed.
> > Default thresholds are utilized for Sapphire Rappids, as accessing the
> > threshold requires accessing the UBOX device on Uncore bus 0, which can
> > only be achieved using MSR access. The non-PCI-compliant MMIO BARs are
> > not available for this purpose.
> >
> > Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
>
> Does this patch depend on the other patch, the one introducing
> Sapphire Rappids to peci/cputemp ?
Yes they are dependent.
Will bundle them together & resend.

~Naresh

>
> Guenter
>
> > ---
> >  drivers/hwmon/peci/dimmtemp.c | 24 +++++++++++++++++++++++-
> >  1 file changed, 23 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/hwmon/peci/dimmtemp.c b/drivers/hwmon/peci/dimmtemp.c
> > index ce89da3937a0..ea4ac5a023cf 100644
> > --- a/drivers/hwmon/peci/dimmtemp.c
> > +++ b/drivers/hwmon/peci/dimmtemp.c
> > @@ -30,8 +30,10 @@
> >  #define DIMM_IDX_MAX_ON_ICX  2
> >  #define CHAN_RANK_MAX_ON_ICXD        4
> >  #define DIMM_IDX_MAX_ON_ICXD 2
> > +#define CHAN_RANK_MAX_ON_SPR 128
> > +#define DIMM_IDX_MAX_ON_SPR  2
> >
> > -#define CHAN_RANK_MAX                CHAN_RANK_MAX_ON_HSX
> > +#define CHAN_RANK_MAX                CHAN_RANK_MAX_ON_SPR
> >  #define DIMM_IDX_MAX         DIMM_IDX_MAX_ON_HSX
> >  #define DIMM_NUMS_MAX                (CHAN_RANK_MAX * DIMM_IDX_MAX)
> >
> > @@ -534,6 +536,15 @@ read_thresholds_icx(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u
> >       return 0;
> >  }
> >
> > +static int
> > +read_thresholds_spr(struct peci_dimmtemp *priv, int dimm_order, int chan_rank, u32 *data)
> > +{
> > +     /* Use defaults */
> > +     *data = (95 << 16) | (90 << 8);
> > +
> > +     return 0;
> > +}
> > +
> >  static const struct dimm_info dimm_hsx = {
> >       .chan_rank_max  = CHAN_RANK_MAX_ON_HSX,
> >       .dimm_idx_max   = DIMM_IDX_MAX_ON_HSX,
> > @@ -576,6 +587,13 @@ static const struct dimm_info dimm_icxd = {
> >       .read_thresholds = &read_thresholds_icx,
> >  };
> >
> > +static const struct dimm_info dimm_spr = {
> > +     .chan_rank_max  = CHAN_RANK_MAX_ON_SPR,
> > +     .dimm_idx_max   = DIMM_IDX_MAX_ON_SPR,
> > +     .min_peci_revision = 0x40,
> > +     .read_thresholds = &read_thresholds_spr,
> > +};
> > +
> >  static const struct auxiliary_device_id peci_dimmtemp_ids[] = {
> >       {
> >               .name = "peci_cpu.dimmtemp.hsx",
> > @@ -601,6 +619,10 @@ static const struct auxiliary_device_id peci_dimmtemp_ids[] = {
> >               .name = "peci_cpu.dimmtemp.icxd",
> >               .driver_data = (kernel_ulong_t)&dimm_icxd,
> >       },
> > +     {
> > +             .name = "peci_cpu.dimmtemp.spr",
> > +             .driver_data = (kernel_ulong_t)&dimm_spr,
> > +     },
> >       { }
> >  };
> >  MODULE_DEVICE_TABLE(auxiliary, peci_dimmtemp_ids);
> > --
> > 2.41.0
> >