linux-kernel - Re: [PATCH 1/1] x86/platform/x86: Fix count of CHas on multi-pci-segment arches

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Date:   Tue, 13 Mar 2018 13:28:37 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Kroening, Gary" <gary.kroening@....com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Travis, Mike" <mike.travis@....com>,
        "Banman, Andrew" <abanman@....com>,
        "Sivanich, Dimitri" <dimitri.sivanich@....com>,
        "Anderson, Russ" <russ.anderson@....com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] x86/platform/x86: Fix count of CHas on
 multi-pci-segment arches



On 3/13/2018 1:22 PM, Andy Shevchenko wrote:
> On Tue, Mar 13, 2018 at 7:15 PM, Liang, Kan <kan.liang@...ux.intel.com> wrote:
>> On 3/13/2018 12:00 PM, Andy Shevchenko wrote:
>>> On Tue, Mar 13, 2018 at 5:58 PM, Andy Shevchenko
>>> <andy.shevchenko@...il.com> wrote:
>>>> On Tue, Mar 13, 2018 at 3:42 AM, Liang, Kan <kan.liang@...ux.intel.com>
>>>> wrote:
> 
>>>>> +#define SKX_CAPID6             0x9c
> 
>>>>> +       pci_read_config_dword(dev, SKX_CAPID6, &val);
> 
>>> Moreover, this is too non-flexible. Can't you find a capability based
>>> on CAP ID  + offset?
>>>
>>
>> It looks it doesn't use capability.
> 
> See below. It would be sad if it's true. (Will need comment in that case)
> 
>> 16:1e.3 System peripheral: Intel Corporation Sky Lake-E PCU Registers (rev
>> 04)
>> 00: 86 80 83 20 00 00 00 00 04 00 80 08 00 00 80 00
>> 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>> 20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 00 00
>> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 
> Can you instead provide
> % lspci -nk -vvv -xx -s 16:1e.3
> ?

$ lspci -nk -vvv -xx -s 16:1e.3
16:1e.3 0880: 8086:2083 (rev 04)
         Subsystem: 8086:0000
         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-
00: 86 80 83 20 00 00 00 00 04 00 80 08 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00