linux-kernel - Re: [PATCH 1/4] platform/x86: intel_pmc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <04398317-a3b8-9387-e532-fcf26da9220e@linux.intel.com>
Date:   Wed, 26 Sep 2018 19:41:49 +0530
From:   "Bhardwaj, Rajneesh" <rajneesh.bhardwaj@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Platform Driver <platform-driver-x86@...r.kernel.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>,
        Souvik Kumar Chakravarty <souvik.k.chakravarty@...el.com>
Subject: Re: [PATCH 1/4] platform/x86: intel_pmc_core: Show Latency Tolerance
 info



On 26-Sep-18 7:18 PM, Andy Shevchenko wrote:
> On Mon, Sep 3, 2018 at 9:06 PM Rajneesh Bhardwaj
> <rajneesh.bhardwaj@...ux.intel.com> wrote:
>> This adds support to show the Latency Tolerance Reporting for the IPs on
>> the PCH as reported by the PMC. The format shown here is raw LTR data
>> payload that can further be decoded as per the PCI specification.
>>
>> This also fixes some minor alignment issues in the header file by
>> removing spaces and converting to tabs at some places.
> Thanks for the patch, my comments below.

Hi Andy,

Thanks for the review, my answers below.
>
>> +static const struct pmc_bit_map spt_ltr_show_map[] = {
>> +       {"IP 0  : LTR_SOUTHPORT_A",             SPT_PMC_LTR_SPA},
>> +       {"IP 1  : LTR_SOUTHPORT_B",             SPT_PMC_LTR_SPB},
>> +       {"IP 2  : LTR_SATA",                    SPT_PMC_LTR_SATA},
>> +       {"IP 3  : LTR_GIGABIT_ETHERNET",        SPT_PMC_LTR_GBE},
>> +       {"IP 4  : LTR_XHCI",                    SPT_PMC_LTR_XHCI},
>> +       /* IP 5 is reserved */
>> +       {"IP 6  : LTR_ME",                      SPT_PMC_LTR_ME},
>> +       /* EVA is Enterprise Value Add, doesn't really exist on PCH */
>> +       {"IP 7  : LTR_EVA",                     SPT_PMC_LTR_EVA},
>> +       {"IP 8  : LTR_SOUTHPORT_C",             SPT_PMC_LTR_SPC},
>> +       {"IP 9  : LTR_HD_AUDIO",                SPT_PMC_LTR_AZ},
>> +       /* IP 10 is reserved */
>> +       {"IP 11 : LTR_LPSS",                    SPT_PMC_LTR_LPSS},
>> +       {"IP 12 : LTR_SOUTHPORT_D",             SPT_PMC_LTR_SPD},
>> +       {"IP 13 : LTR_SOUTHPORT_E",             SPT_PMC_LTR_SPE},
>> +       {"IP 14 : LTR_CAMERA",                  SPT_PMC_LTR_CAM},
>> +       {"IP 15 : LTR_ESPI",                    SPT_PMC_LTR_ESPI},
>> +       {"IP 16 : LTR_SCC",                     SPT_PMC_LTR_SCC},
>> +       {"IP 17 : LTR_ISH",                     SPT_PMC_LTR_ISH},
>> +       /* Below two cannot be for LTR_IGNORE */
>> +       {"LTR_CURRENT_PLATFORM",                SPT_PMC_LTR_CUR_PLT},
>> +       {"LTR_AGGREGATED_SYSTEM",               SPT_PMC_LTR_CUR_ASLT},
> Before no map has this fancy "IP xx :" prefixes. Please, remove.

  The users of the driver often ask for IP Numbers while performing 
LTR_IGNORE operation so this is deliberately added. Please consider it.

>
>> +       {},
> No need for comma
Ok.
>> +
> Redundant.

OK
>
>> +};
>> +static const struct pmc_bit_map cnp_ltr_show_map[] = {
> Same comments as above.
>
>> +};
>> +       debugfs_create_file("ltr_show", 0644, dir, pmcdev,
>> +                           &pmc_core_ltr_fops);
> One line?

IIRC, it was crossing the limit. I will check again and if possible 
would change it.

>
>>   #define NUM_RETRIES                            100
>>   #define NUM_IP_IGN_ALLOWED                     17
> + blank line here.

Sure.

>
>> +#define SPT_PMC_LTR_CUR_PLT                    0x350