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

From: Jonathan Cameron via iommu <iommu@lists.linux-foundation.org>
To: Yicong Yang <yangyicong@hisilicon.com>
Cc: mark.rutland@arm.com, prime.zeng@huawei.com,
	alexander.shishkin@linux.intel.com, linux-pci@vger.kernel.org,
	linuxarm@huawei.com, james.clark@arm.com, will@kernel.org,
	peterz@infradead.org, mingo@redhat.com, helgaas@kernel.org,
	liuqi115@huawei.com, suzuki.poulose@arm.com, acme@kernel.org,
	zhangshaokun@hisilicon.com, linux-arm-kernel@lists.infradead.org,
	mathieu.poirier@linaro.org, gregkh@linuxfoundation.org,
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	iommu@lists.linux-foundation.org, leo.yan@linaro.org,
	robin.murphy@arm.com
Subject: Re: [PATCH v8 6/8] perf tool: Add support for parsing HiSilicon PCIe Trace packet
Date: Mon, 16 May 2022 15:23:17 +0100	[thread overview]
Message-ID: <20220516152317.000029d8@Huawei.com> (raw)
In-Reply-To: <20220516125223.32012-7-yangyicong@hisilicon.com>

On Mon, 16 May 2022 20:52:21 +0800
Yicong Yang <yangyicong@hisilicon.com> wrote:

> From: Qi Liu <liuqi115@huawei.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@huawei.com>
> Signed-off-by: Yicong Yang <yangyicong@hisilicon.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.

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