linux-kernel - Re: [PATCH 1/6] platform/x86/intel/tpmi: Add additional TPMI header fields

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Message-ID: <2c3966b13ac5bb2db879aa2872e5a0a9728bc708.camel@linux.intel.com>
Date:   Thu, 30 Nov 2023 09:10:20 -0500
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Hans de Goede <hdegoede@...hat.com>, markgross@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] platform/x86/intel/tpmi: Add additional TPMI header
 fields

On Thu, 2023-11-30 at 14:33 +0200, Ilpo Järvinen wrote:
> On Tue, 28 Nov 2023, Srinivas Pandruvada wrote:
> 
> > TPMI information header added additional fields in version 2. Some
> > of the
> > reserved fields in version 1 are used to define new fields.
> > Parse new fields and export as part of platform data. These fields
> > include:
> > - PCI segment ID
> > - Partition ID of the package, useful when more than one Intel VSEC
> > PCI
> > device per package
> > - cdie_mask: Mask of all compute dies in this partition
> > 
> > Signed-off-by: Srinivas Pandruvada
> > <srinivas.pandruvada@...ux.intel.com>
> > ---
> >  drivers/platform/x86/intel/tpmi.c | 11 ++++++++++-
> >  include/linux/intel_tpmi.h        |  6 ++++++
> >  2 files changed, 16 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/platform/x86/intel/tpmi.c
> > b/drivers/platform/x86/intel/tpmi.c
> > index 311abcac894a..c89aa4d14bea 100644
> > --- a/drivers/platform/x86/intel/tpmi.c
> > +++ b/drivers/platform/x86/intel/tpmi.c
> > @@ -128,6 +128,9 @@ struct intel_tpmi_info {
> >   * @dev:       PCI device number
> >   * @bus:       PCI bus number
> >   * @pkg:       CPU Package id
> > + * @segment: PCI segment id
> > + * @partition: Package Partition id
> > + * @cdie_mask: Bitmap of compute dies in the current partition
> >   * @reserved:  Reserved for future use
> >   * @lock:      When set to 1 the register is locked and becomes
> > read-only
> >   *             until next reset. Not for use by the OS driver.
> > @@ -139,7 +142,10 @@ struct tpmi_info_header {
> >         u64 dev:5;
> >         u64 bus:8;
> >         u64 pkg:8;
> > -       u64 reserved:39;
> > +       u64 segment:8;
> > +       u64 partition:2;
> > +       u64 cdie_mask:16;
> > +       u64 reserved:13;
> >         u64 lock:1;
> >  } __packed;
> > @@ -684,6 +690,9 @@ static int tpmi_process_info(struct
> > intel_tpmi_info *tpmi_info,
> >         tpmi_info->plat_info.bus_number = header.bus;
> >         tpmi_info->plat_info.device_number = header.dev;
> >         tpmi_info->plat_info.function_number = header.fn;
> > +       tpmi_info->plat_info.cdie_mask = header.cdie_mask;
> > +       tpmi_info->plat_info.partition = header.partition;
> > +       tpmi_info->plat_info.segment = header.segment;
> >  
> >         iounmap(info_mem);
> >  
> > diff --git a/include/linux/intel_tpmi.h
> > b/include/linux/intel_tpmi.h
> > index ee07393445f9..939663bb095f 100644
> > --- a/include/linux/intel_tpmi.h
> > +++ b/include/linux/intel_tpmi.h
> > @@ -14,7 +14,10 @@
> >  
> >  /**
> >   * struct intel_tpmi_plat_info - Platform information for a TPMI
> > device instance
> > + * @cdie_mask: Mask of all compute dies in the partition
> >   * @package_id:        CPU Package id
> > + * @partition:  Package partition id when multiple VSEC PCI
> > devices per package
> > + * @segment: PCI segment ID
> >   * @bus_number:        PCI bus number
> >   * @device_number: PCI device number
> >   * @function_number: PCI function number
> > @@ -23,7 +26,10 @@
> >   * struct is used to return data via tpmi_get_platform_data().
> >   */
> >  struct intel_tpmi_plat_info {
> > +       u16 cdie_mask;
> >         u8 package_id;
> > +       u8 partition;
> > +       u8 segment;
> >         u8 bus_number;
> >         u8 device_number;
> >         u8 function_number;
> 
> I've a number of questions about this patch...
> 
> - There no version check anywhere, yet commit message talks about v2?
> 
No need to check, as the other fields will be 0s in v1.

> - What will those fields have in v1?
They are 0s as they were reserved for future use.

> 
> - Entirely unrelated to the rest of this serie? So no users for
> these?
>   Why not send this along with the patches containing the actual
> users
>   so it'd have been easier to find the answers from the patches?
> 
This is the core changes, so submitted as changes done in specs.
But fine to bundle with next series. I limit number of changes per
kernel release in the order of importance in the current products.

Thanks,
Srinivas