linux-kernel - Re: [PATCH v8 6/8] perf tool: Add support for parsing HiSilicon PCIe Trace packet

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Date:   Mon, 16 May 2022 15:23:17 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Yicong Yang <yangyicong@...ilicon.com>
CC:     <gregkh@...uxfoundation.org>, <alexander.shishkin@...ux.intel.com>,
        <leo.yan@...aro.org>, <james.clark@....com>, <will@...nel.org>,
        <robin.murphy@....com>, <acme@...nel.org>, <john.garry@...wei.com>,
        <helgaas@...nel.org>, <lorenzo.pieralisi@....com>,
        <mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
        <mark.rutland@....com>, <joro@...tes.org>,
        <shameerali.kolothum.thodi@...wei.com>, <peterz@...radead.org>,
        <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>,
        <iommu@...ts.linux-foundation.org>, <prime.zeng@...wei.com>,
        <liuqi115@...wei.com>, <zhangshaokun@...ilicon.com>,
        <linuxarm@...wei.com>
Subject: Re: [PATCH v8 6/8] perf tool: Add support for parsing HiSilicon
 PCIe Trace packet

On Mon, 16 May 2022 20:52:21 +0800
Yicong Yang <yangyicong@...ilicon.com> 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
> ....
> 
> Signed-off-by: Qi Liu <liuqi115@...wei.com>
> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>

>From point of view of a reviewer who doesn't know this code well, this
all looks sensible.  One trivial comment inline.

Thanks,

Jonathan

> diff --git a/tools/perf/util/hisi-ptt.c b/tools/perf/util/hisi-ptt.c
> new file mode 100644
> index 000000000000..2afc1a663c2a
> --- /dev/null
> +
> +static void hisi_ptt_free(struct perf_session *session)
> +{
> +	struct hisi_ptt *ptt = container_of(session->auxtrace, struct hisi_ptt,
> +					    auxtrace);
> +
> +	session->auxtrace = NULL;
> +	free(ptt);
> +}
> +
> +static bool hisi_ptt_evsel_is_auxtrace(struct perf_session *session,
> +				       struct evsel *evsel)
> +{
> +	struct hisi_ptt *ptt = container_of(session->auxtrace, struct hisi_ptt, auxtrace);

Check for consistent wrapping of lines like this. This doesn't match the one just above.