linux-kernel - Re: intel_pmc_core does not initialize intel 8th gen PMC

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Date:   Tue, 13 Feb 2018 10:00:52 -0800
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        kitestramuort <kitestramuort@...istici.org>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: intel_pmc_core does not initialize intel 8th gen PMC

On Tue, 2018-02-13 at 18:21 +0200, Andy Shevchenko wrote:
> +Cc: Authors and correct ML
> 
> On Mon, Feb 12, 2018 at 11:09 AM, kitestramuort
> <kitestramuort@...istici.org> wrote:
> > don't know if this is intended. In 4.15.2 i have:
> 
> AFAIU the driver now binds to the hardcoded value of a PA of the
> device. So, you still have driver enabled.
> 
> Srinivas, is my understanding correct?
Yes. This doesn't bind to PCI device. But the driver is still doing
what it is supposed to do.
You should still see
/sys/kernel/debug/pmc_core/* as before.

Thanks,
Srinivas

> 
> > dmesg:
> > intel_pmc_core 0000:00:1f.2: enabling device (0000 -> 0002)
> > 
> > lspci:
> > 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC
> > (rev
> > 21)
> >         Subsystem: Intel Corporation Sunrise Point-LP PMC
> >         Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
> > ParErr- Stepping- SERR- FastB2B- DisINTx-
> >         Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast
> > >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR- INTx-
> >         Region 0: Memory at dff00000 (32-bit, non-prefetchable)
> > [size=16K]
> >         Kernel driver in use: intel_pmc_core
> > in 4.16.0-rc1 this becomes
> > dmesg:
> > intel_pmc_core:  initialized
> > 
> > lspci:
> > 00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC
> > (rev
> > 21)
> >         Subsystem: Intel Corporation Sunrise Point-LP PMC
> >         Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop-
> > ParErr- Stepping- SERR- FastB2B- DisINTx-
> >         Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast
> > >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR- INTx-
> >         Region 0: Memory at dff00000 (32-bit, non-prefetchable)
> > [disabled] [size=16K]
> 
> 
>