Re: [PATCH v7 5/7] perf tool: Add support for HiSilicon PCIe Tune and Trace device driver

[Yicong Yang <yangyicong@huawei.com>]

On 2022/4/12 1:19, John Garry wrote:
> On 07/04/2022 13:58, Yicong Yang wrote:
>> From: Qi Liu <liuqi115@huawei.com>
>>
>> 'perf record' and 'perf report --dump-raw-trace' supported in this
>> patch.
>>
>> 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>
>> ---
>>   tools/perf/arch/arm/util/auxtrace.c           |  76 +++++-
>>   tools/perf/arch/arm/util/pmu.c                |   3 +
>>   tools/perf/arch/arm64/util/Build              |   2 +-
>>   tools/perf/arch/arm64/util/hisi_ptt.c         | 195 ++++++++++++++++
>>   tools/perf/util/Build                         |   2 +
>>   tools/perf/util/auxtrace.c                    |   4 +
>>   tools/perf/util/auxtrace.h                    |   1 +
>>   tools/perf/util/hisi-ptt-decoder/Build        |   1 +
>>   .../hisi-ptt-decoder/hisi-ptt-pkt-decoder.c   | 170 ++++++++++++++
>>   .../hisi-ptt-decoder/hisi-ptt-pkt-decoder.h   |  28 +++
>>   tools/perf/util/hisi_ptt.c                    | 218 ++++++++++++++++++
>>   tools/perf/util/hisi_ptt.h                    |  28 +++
>>   12 files changed, 724 insertions(+), 4 deletions(-)
>>   create mode 100644 tools/perf/arch/arm64/util/hisi_ptt.c
>>   create mode 100644 tools/perf/util/hisi-ptt-decoder/Build
>>   create mode 100644 tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.c
>>   create mode 100644 tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.h
>>   create mode 100644 tools/perf/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 5fc6a2a3dbc5..393f5757c039 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@linaro.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 +53,58 @@ 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;
>> +    }
>> +
>> +    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;
> 
> using PTR_ERR seems better, if possible
> 

ok will change to that. *err = -ENOMEM is used here to keep consistence with
what spe does.

>> +        goto out;
>> +    }
>> +
>> +    rewinddir(dir);
>> +    while ((dent = readdir(dir))) {
>> +        if (strstr(dent->d_name, HISI_PTT_PMU_NAME) && idx < (*nr_ptts)) {
>> +            hisi_ptt_pmus[idx] = perf_pmu__find(dent->d_name);
>> +            if (hisi_ptt_pmus[idx]) {
>> +                pr_debug2("%s %d: hisi_ptt_pmu %d type %d name %s\n",
> 
> do you really need this?
> 

I asked Qi maybe it's unnecessary, but to keep consistence like arm spe.

>> +                    __func__, __LINE__, idx,
>> +                    hisi_ptt_pmus[idx]->type,
>> +                    hisi_ptt_pmus[idx]->name);
>> +                    idx++;
>> +            }
>> +
>> +        }
>> +    }
>> +
>> +out:
>> +    closedir(dir);
>> +    return hisi_ptt_pmus;
>> +}
>> +
>>   struct auxtrace_record
>>   *auxtrace_record__init(struct evlist *evlist, int *err)
>>   {
>> @@ -57,8 +112,12 @@ struct auxtrace_record
>>       struct evsel *evsel;
>>       bool found_etm = false;
>>       struct perf_pmu *found_spe = NULL;
>> +    struct perf_pmu *found_ptt = NULL;
>>       struct perf_pmu **arm_spe_pmus = NULL;
>> +    struct perf_pmu **hisi_ptt_pmus = NULL;
>> +
>>       int nr_spes = 0;
>> +    int nr_ptts = 0;
>>       int i = 0;
>>         if (!evlist)
>> @@ -66,13 +125,14 @@ struct auxtrace_record
>>         cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
>>       arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
>> +    hisi_ptt_pmus = find_all_hisi_ptt_pmus(&nr_ptts, err);
>>         evlist__for_each_entry(evlist, evsel) {
>>           if (cs_etm_pmu &&
>>               evsel->core.attr.type == cs_etm_pmu->type)
>>               found_etm = true;
>>   -        if (!nr_spes || found_spe)
>> +        if ((!nr_spes || found_spe) && (!nr_ptts || found_ptt))
>>               continue;
>>             for (i = 0; i < nr_spes; i++) {
>> @@ -81,11 +141,18 @@ struct auxtrace_record
>>                   break;
>>               }
>>           }
>> +
>> +        for (i = 0; i < nr_ptts; i++) {
>> +            if (evsel->core.attr.type == hisi_ptt_pmus[i]->type) {
>> +                found_ptt = hisi_ptt_pmus[i];
>> +                break;
>> +            }
>> +        }
>>       }
>>       free(arm_spe_pmus);
> 
> do you need to do something similar for hisi ptt?
> 

thanks for catching this. it's missed. will fix.

>>   -    if (found_etm && found_spe) {
>> -        pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n");
>> +    if (found_etm && found_spe && found_ptt) {
>> +        pr_err("Concurrent ARM Coresight ETM ,SPE and HiSilicon PCIe Trace operation not currently supported\n");
>>           *err = -EOPNOTSUPP;
>>           return NULL;
>>       }
>> @@ -96,6 +163,9 @@ struct auxtrace_record
>>   #if defined(__aarch64__)
>>       if (found_spe)
>>           return arm_spe_recording_init(err, found_spe);
>> +
>> +    if (found_ptt)
>> +        return hisi_ptt_recording_init(err, found_ptt);
>>   #endif
>>         /*
>> diff --git a/tools/perf/arch/arm/util/pmu.c b/tools/perf/arch/arm/util/pmu.c
>> index b8b23b9dc598..89a3cedb4557 100644
>> --- a/tools/perf/arch/arm/util/pmu.c
>> +++ b/tools/perf/arch/arm/util/pmu.c
>> @@ -10,6 +10,7 @@
>>   #include <linux/string.h>
>>     #include "arm-spe.h"
>> +#include "hisi_ptt.h"
>>   #include "../../../util/pmu.h"
>>     struct perf_event_attr
>> @@ -22,6 +23,8 @@ struct perf_event_attr
>>   #if defined(__aarch64__)
>>       } else if (strstarts(pmu->name, ARM_SPE_PMU_NAME)) {
>>           return arm_spe_pmu_default_config(pmu);
>> +    } else if (strstarts(pmu->name, HISI_PTT_PMU_NAME)) {
>> +        pmu->selectable = true;
>>   #endif
>>       }
>>   diff --git a/tools/perf/arch/arm64/util/Build b/tools/perf/arch/arm64/util/Build
>> index 9fcb4e68add9..8b7fd1dc9f37 100644
>> --- a/tools/perf/arch/arm64/util/Build
>> +++ b/tools/perf/arch/arm64/util/Build
>> @@ -11,4 +11,4 @@ perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
>>   perf-$(CONFIG_AUXTRACE) += ../../arm/util/pmu.o \
>>                     ../../arm/util/auxtrace.o \
>>                     ../../arm/util/cs-etm.o \
>> -                  arm-spe.o mem-events.o
>> +                  arm-spe.o mem-events.o hisi_ptt.o
> 
> nit: others use '-' in the name
> 

will follow the convention.

> 
> I'll check the rest tomorrow.

Thanks,
Yicong