linux-kernel - Re: [PATCH v13 3/3] perf tool: Add support for parsing HiSilicon PCIe Trace packet

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Date:   Mon, 19 Sep 2022 12:32:38 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Yicong Yang <yangyicong@...wei.com>
Cc:     acme@...nel.org, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, leo.yan@...aro.org,
        james.clark@....com, will@...nel.org, mathieu.poirier@...aro.org,
        mark.rutland@....com, suzuki.poulose@....com,
        jonathan.cameron@...wei.com, john.garry@...wei.com,
        mike.leach@...aro.org, gregkh@...uxfoundation.org,
        lorenzo.pieralisi@....com, shameerali.kolothum.thodi@...wei.com,
        mingo@...hat.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-perf-users@...r.kernel.org, prime.zeng@...wei.com,
        zhangshaokun@...ilicon.com, linuxarm@...wei.com,
        yangyicong@...ilicon.com, liuqi6124@...il.com
Subject: Re: [PATCH v13 3/3] perf tool: Add support for parsing HiSilicon
 PCIe Trace packet

On Mon, Sep 19, 2022 at 05:00:45PM +0800, Yicong Yang wrote:
> From: Qi Liu <liuqi115@...wei.com>
> 
> Add support for using 'perf report --dump-raw-trace' to parse PTT packet.
> 
> Example usage:
> 
> Output will contain raw PTT data and its textual representation, such
> as:
> 
> 0 0 0x5810 [0x30]: PERF_RECORD_AUXTRACE size: 0x400000  offset: 0
> ref: 0xa5d50c725  idx: 0  tid: -1  cpu: 0
> .
> . ... HISI PTT data: size 4194304 bytes
> .  00000000: 00 00 00 00                                 Prefix
> .  00000004: 08 20 00 60                                 Header DW0
> .  00000008: ff 02 00 01                                 Header DW1
> .  0000000c: 20 08 00 00                                 Header DW2
> .  00000010: 10 e7 44 ab                                 Header DW3
> .  00000014: 2a a8 1e 01                                 Time
> .  00000020: 00 00 00 00                                 Prefix
> .  00000024: 01 00 00 60                                 Header DW0
> .  00000028: 0f 1e 00 01                                 Header DW1
> .  0000002c: 04 00 00 00                                 Header DW2
> .  00000030: 40 00 81 02                                 Header DW3
> .  00000034: ee 02 00 00                                 Time

This is great!  Is there a way to actually decode the TLP headers?
E.g., something along the lines of what this does?
https://github.com/NetTLP/wireshark-nettlp/blob/master/plugins/nettlp.lua

If there is, it might be nice if the commit log included a hint about
how to do more decoding.

Bjorn