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Date: Mon, 26 Sep 2022 14:53:34 +0800
From: Yicong Yang <yangyicong@...wei.com>
To: John Garry <john.garry@...wei.com>
CC: <yangyicong@...ilicon.com>, <gregkh@...uxfoundation.org>,
<mathieu.poirier@...aro.org>, <will@...nel.org>,
<james.clark@....com>, <leo.yan@...aro.org>,
<alexander.shishkin@...ux.intel.com>, <peterz@...radead.org>,
<helgaas@...nel.org>, <lorenzo.pieralisi@....com>,
<shameerali.kolothum.thodi@...wei.com>, <mark.rutland@....com>,
<suzuki.poulose@....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>, <liuqi6124@...il.com>, <acme@...nel.org>,
<jonathan.cameron@...wei.com>, <mike.leach@...aro.org>
Subject: Re: [PATCH v13 2/3] perf tool: Add support for HiSilicon PCIe Tune
and Trace device driver
On 2022/9/23 18:49, John Garry wrote:
> On 19/09/2022 10:00, Yicong Yang wrote:
>> From: Qi Liu <liuqi115@...wei.com>
>>
>> HiSilicon PCIe tune and trace device (PTT) could dynamically tune
>> the PCIe link's events, and trace the TLP headers).
>>
>> This patch add support for PTT device in perf tool, so users could
>> use 'perf record' to get TLP headers trace data.
>>
>> Reviewed-by: Leo Yan <leo.yan@...aro.org>
>> Signed-off-by: Qi Liu <liuqi115@...wei.com>
>> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
>
> I'm not overly fimilar with the auxtrace code, but this patch looks ok apart from comments, so acked-by seems more appropiate than reviewed-by:
>
> Acked-by: John Garry <john.garry@...wei.com>
Thanks! May I have the ack for the other 2 patches as well?
Some replies below.
>
>> ---
>> tools/perf/arch/arm/util/auxtrace.c | 63 +++++++++
>> tools/perf/arch/arm/util/pmu.c | 3 +
>> tools/perf/arch/arm64/util/Build | 2 +-
>> tools/perf/arch/arm64/util/hisi-ptt.c | 188 ++++++++++++++++++++++++++
>> tools/perf/util/auxtrace.c | 1 +
>> tools/perf/util/auxtrace.h | 1 +
>> tools/perf/util/hisi-ptt.h | 16 +++
>> 7 files changed, 273 insertions(+), 1 deletion(-)
>> create mode 100644 tools/perf/arch/arm64/util/hisi-ptt.c
>> create mode 100644 tools/perf/util/hisi-ptt.h
>>
>> diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
>> index 384c7cfda0fd..129ed72391a4 100644
>> --- a/tools/perf/arch/arm/util/auxtrace.c
>> +++ b/tools/perf/arch/arm/util/auxtrace.c
>> @@ -4,9 +4,11 @@
>> * Author: Mathieu Poirier <mathieu.poirier@...aro.org>
>> */
>> +#include <dirent.h>
>> #include <stdbool.h>
>> #include <linux/coresight-pmu.h>
>> #include <linux/zalloc.h>
>> +#include <api/fs/fs.h>
>> #include "../../../util/auxtrace.h"
>> #include "../../../util/debug.h"
>> @@ -14,6 +16,7 @@
>> #include "../../../util/pmu.h"
>> #include "cs-etm.h"
>> #include "arm-spe.h"
>> +#include "hisi-ptt.h"
>> static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
>> {
>> @@ -50,6 +53,52 @@ static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
>> return arm_spe_pmus;
>> }
>> +static struct perf_pmu **find_all_hisi_ptt_pmus(int *nr_ptts, int *err)
>> +{
>> + const char *sysfs = sysfs__mountpoint();
>> + struct perf_pmu **hisi_ptt_pmus = NULL;
>> + struct dirent *dent;
>> + char path[PATH_MAX];
>> + DIR *dir = NULL;
>> + int idx = 0;
>> +
>> + snprintf(path, PATH_MAX, "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
>> + dir = opendir(path);
>> + if (!dir) {
>> + pr_err("can't read directory '%s'\n", EVENT_SOURCE_DEVICE_PATH);
>> + *err = -EINVAL;
>> + goto out;
>
> Do you really need to call closedir() in this scenario?
>
It's unnecessary here. will return NULL directly.
>> + }
>> +
>> + while ((dent = readdir(dir))) {
>> + if (strstr(dent->d_name, HISI_PTT_PMU_NAME))
>> + (*nr_ptts)++;
>> + }
>> +
>> + if (!(*nr_ptts))
>> + goto out;
>> +
>> + hisi_ptt_pmus = zalloc(sizeof(struct perf_pmu *) * (*nr_ptts));
>> + if (!hisi_ptt_pmus) {
>> + pr_err("hisi_ptt alloc failed\n");
>> + *err = -ENOMEM;
>> + goto out;
>> + }
>> +
>> + rewinddir(dir);
>> + while ((dent = readdir(dir))) {
>> + if (strstr(dent->d_name, HISI_PTT_PMU_NAME) && idx < (*nr_ptts)) {
>
> idx < *nr_ptts
>
> is ok
>
ok.
>> + hisi_ptt_pmus[idx] = perf_pmu__find(dent->d_name);
>> + if (hisi_ptt_pmus[idx])
>> + idx++;
>> + }
>> + }
>> +
>> +out:
>> + closedir(dir);
>> + return hisi_ptt_pmus;
>> +}
>> +
[...]
>> +
>> +#define KiB(x) ((x) * 1024)
>> +#define MiB(x) ((x) * 1024 * 1024)
>
> surely we have defines for these available elsewhere
>
Yes but we looks like have no public definition for these:
yangyicong@...ntu:~/mainline_linux/linux$ egrep -rwn "#define KiB|#define MiB" tools/perf/
tools/perf/arch/arm64/util/hisi-ptt.c:27:#define KiB(x) ((x) * 1024)
tools/perf/arch/arm64/util/hisi-ptt.c:28:#define MiB(x) ((x) * 1024 * 1024)
tools/perf/arch/arm64/util/arm-spe.c:28:#define KiB(x) ((x) * 1024)
tools/perf/arch/arm64/util/arm-spe.c:29:#define MiB(x) ((x) * 1024 * 1024)
tools/perf/arch/x86/util/intel-bts.c:28:#define KiB(x) ((x) * 1024)
tools/perf/arch/x86/util/intel-bts.c:29:#define MiB(x) ((x) * 1024 * 1024)
tools/perf/arch/x86/util/intel-pt.c:35:#define KiB(x) ((x) * 1024)
tools/perf/arch/x86/util/intel-pt.c:36:#define MiB(x) ((x) * 1024 * 1024)
tools/perf/util/cs-etm.h:188:#define KiB(x) ((x) * 1024)
tools/perf/util/cs-etm.h:189:#define MiB(x) ((x) * 1024 * 1024)
We can centralize this definition after this series.
>> +
>> +struct hisi_ptt_recording {
>> + struct auxtrace_record itr;
>> + struct perf_pmu *hisi_ptt_pmu;
>> + struct evlist *evlist;
>> +};
>> +
[...]
>> diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
>> index 6edab8a16de6..c30611d9ee99 100644
>> --- a/tools/perf/util/auxtrace.c
>> +++ b/tools/perf/util/auxtrace.c
>> @@ -1319,6 +1319,7 @@ int perf_event__process_auxtrace_info(struct perf_session *session,
>> case PERF_AUXTRACE_S390_CPUMSF:
>> err = s390_cpumsf_process_auxtrace_info(event, session);
>> break;
>> + case PERF_AUXTRACE_HISI_PTT:
>> case PERF_AUXTRACE_UNKNOWN:
>> default:
>> return -EINVAL;
>> diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
>> index 6a4fbfd34c6b..3a122fc01ccd 100644
>> --- a/tools/perf/util/auxtrace.h
>> +++ b/tools/perf/util/auxtrace.h
>> @@ -48,6 +48,7 @@ enum auxtrace_type {
>> PERF_AUXTRACE_CS_ETM,
>> PERF_AUXTRACE_ARM_SPE,
>> PERF_AUXTRACE_S390_CPUMSF,
>> + PERF_AUXTRACE_HISI_PTT,
>> };
>> enum itrace_period_type {
>> diff --git a/tools/perf/util/hisi-ptt.h b/tools/perf/util/hisi-ptt.h
>
> I'm still not a fan of having a header file which is only included by 1x .c file, which this seems to be
>
The stuff in hisi-ptt.h is shared across several source files:
yangyicong@...ntu:~/mainline_linux/linux$ egrep -rn "hisi-ptt.h" tools/perf/
tools/perf/arch/arm64/util/hisi-ptt.c:21:#include "../../../util/hisi-ptt.h"
tools/perf/arch/arm/util/auxtrace.c:19:#include "hisi-ptt.h"
tools/perf/arch/arm/util/pmu.c:13:#include "hisi-ptt.h"
Thanks,
Yicong
>> new file mode 100644
>> index 000000000000..82283c81b4c1
>> --- /dev/null
>> +++ b/tools/perf/util/hisi-ptt.h
>> @@ -0,0 +1,16 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/*
>> + * HiSilicon PCIe Trace and Tuning (PTT) support
>> + * Copyright (c) 2022 HiSilicon Technologies Co., Ltd.
>> + */
>> +
>> +#ifndef INCLUDE__PERF_HISI_PTT_H__
>> +#define INCLUDE__PERF_HISI_PTT_H__
>> +
>> +#define HISI_PTT_PMU_NAME "hisi_ptt"
>> +#define HISI_PTT_AUXTRACE_PRIV_SIZE sizeof(u64)
>> +
>> +struct auxtrace_record *hisi_ptt_recording_init(int *err,
>> + struct perf_pmu *hisi_ptt_pmu);
>> +
>> +#endif
>
> .
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