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Message-ID: <5e27d1e8-f329-7e11-2f5a-cc0d53ce1db3@linux.intel.com>
Date:   Fri, 17 Jun 2022 14:51:20 +0800
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Subject: Re: [PATCH v5 2/4] perf jevents: Add python converter script
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To:     Ian Rogers <irogers@google.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        John Garry <john.garry@huawei.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>, Felix Fietkau <nbd@nbd.name>,
        Qi Liu <liuqi115@huawei.com>, Like Xu <likexu@tencent.com>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        Nick Forrington <nick.forrington@arm.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        James Clark <james.clark@arm.com>,
        Andrew Kilroy <andrew.kilroy@arm.com>,
        "Paul A . Clarke" <pc@us.ibm.com>, Will Deacon <will@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        ananth.narayan@amd.com, ravi.bangoria@amd.com,
        santosh.shukla@amd.com, sandipan.das@amd.com,
        Caleb Biggers <caleb.biggers@intel.com>,
        Perry Taylor <perry.taylor@intel.com>,
        Kshipra Bopardikar <kshipra.bopardikar@intel.com>,
        Stephane Eranian <eranian@google.com>
References: <20220616044806.47770-1-irogers@google.com>
 <20220616044806.47770-3-irogers@google.com>
 <7eb148e5-0763-1dbe-d1f5-80e5159be7c8@linux.intel.com>
 <CAP-5=fUy=_HFhhdghRJs-+G75ppsYCRg72SSnoeijvdqb8hyVQ@mail.gmail.com>
 <3108fd92-c05b-961f-2367-81925535bf4f@linux.intel.com>
 <CAP-5=fW10QAD1MZ_RhdCvOTwiWTcYoQps5hSGH4F2JsVYeAB5A@mail.gmail.com>
From:   Xing Zhengjun <zhengjun.xing@linux.intel.com>
In-Reply-To: <CAP-5=fW10QAD1MZ_RhdCvOTwiWTcYoQps5hSGH4F2JsVYeAB5A@mail.gmail.com>
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On 6/17/2022 10:40 AM, Ian Rogers wrote:
> On Thu, Jun 16, 2022 at 6:52 PM Xing Zhengjun
> <zhengjun.xing@linux.intel.com> wrote:
>>
>> Hi Ian,
>>
>> On 6/17/2022 9:26 AM, Ian Rogers wrote:
>>> On Thu, Jun 16, 2022 at 5:04 PM Xing Zhengjun
>>> <zhengjun.xing@linux.intel.com> wrote:
>>>>
>>>> Hi Ian,
>>>>
>>>>      I applied this patch series based on the head of the perf/core
>>>> branch, but it failed when do make.
>>>>      My python version:
>>>>      Python 2.7.18 (default, Mar  8 2021, 13:02:45)
>>>>      [GCC 9.3.0] on linux2
>>>>
>>>>
>>>>      GEN     pmu-events/pmu-events.c
>>>> make[3]: Nothing to be done for 'install_headers'.
>>>>      GEN     python/perf.so
>>>> Traceback (most recent call last):
>>>>      File "pmu-events/jevents.py", line 23, in <module>
>>>>        def file_name_to_table_name(parents: list[str], dirname: str) -> str:
>>>> TypeError: 'type' object is not subscriptable
>>>> make[3]: *** [pmu-events/Build:20: pmu-events/pmu-events.c] Error 1
>>>> make[2]: *** [Makefile.perf:663: pmu-events/pmu-events-in.o] Error 2
>>>> make[2]: *** Waiting for unfinished jobs....
>>>> make[1]: *** [Makefile.perf:240: sub-make] Error 2
>>>> make: *** [Makefile:70: all] Error 2
>>>
>>> Hi Zhengjun,
>>>
>>> Thanks for testing! You are running the test script and not the main
>>> build. Unlike the main build I didn't add a Python version test for
>>> the test script. As mentioned in the cover letter you need Python 3.6
>>> as Python 2 was sunset in 2020.
>>>
>>
>> In fact, I run the main build,
>> $ cd tools/perf
>> $ make
>>
>> $ lsb_release -a
>> No LSB modules are available.
>> Distributor ID: Ubuntu
>> Description:    Ubuntu 20.04.3 LTS
>> Release:        20.04
>> Codename:       focal
>>
>> The default python in Ubuntu 20.04.3 is Python2
>>
>> I think a lot of developers also use the Ubuntu 20.04.3 LTS,
>> it's better to support python2.
> 
> TL;DR "apt install python-dev-is-python3" :-)
> 
> The problem is what you lose by making the code work with python2:
> f-strings, various library functions. You end up coding to a worse
> standard of Python and the code is considered non-pythonic. Python 3.6
> was released in Dec. 2016 and so is over 5 years old now - ie I'm not
> pushing for the bleeding edge.
> 
> A problem we face in the regular perf Python build is that Python 2
> doesn't support new APIs and Python3 has deprecated the old APIs [1].
> I think the sensible thing is to follow Python 3's deprecation plan
> which will mean losing Python 2 support, ie we shouldn't look for
> python2-config in the build any more as python2 won't support the APIs
> our scripts are now using.
> 
> I think arguing that Python 2 was something not worth sunsetting was
> an argument to be made 2 years ago, but now we have to live with the
> consequences. I don't think there is any hardship except an install
> step. For the build changes in these patches if an old version of
> Python is detected then you just don't get jevents and there is a
> warning at build time.

After "sudo apt install python-dev-is-python3", now the python version :
Python 3.8.10 (default, Mar 15 2022, 12:22:08)
[GCC 9.4.0] on linux

But the issue still happened.

$cd tools/perf
$make
   GEN     pmu-events/pmu-events.c
make[3]: Nothing to be done for 'install_headers'.
   GEN     python/perf.so
Traceback (most recent call last):
   File "pmu-events/jevents.py", line 23, in <module>
     def file_name_to_table_name(parents: list[str], dirname: str) -> str:
TypeError: 'type' object is not subscriptable
make[3]: *** [pmu-events/Build:20: pmu-events/pmu-events.c] Error 1
make[2]: *** [Makefile.perf:663: pmu-events/pmu-events-in.o] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [Makefile.perf:240: sub-make] Error 2
make: *** [Makefile:70: all] Error 2


For the python version, I think python3 is ok.
But during the build, we need to add a warning and how to fix messages 
when detecting the system is using pthon2, just like it did before:

Auto-detecting system features:
...                         dwarf: [ on  ]
...            dwarf_getlocations: [ on  ]
...                         glibc: [ on  ]
...                        libbfd: [ on  ]
...                libbfd-buildid: [ on  ]
...                        libcap: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...        numa_num_possible_cpus: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                     libcrypto: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ on  ]
...                           bpf: [ on  ]
...                        libaio: [ on  ]
...                       libzstd: [ on  ]
...        disassembler-four-args: [ on  ]
...         python-dev-is-python3: [ off ]


> 
> Thanks,
> Ian
> 
> [1] https://lore.kernel.org/lkml/20220615014206.26651-1-irogers@google.com/
> 
> 
>>> Thanks,
>>> Ian
>>>
>>>
>>>> On 6/16/2022 12:48 PM, Ian Rogers wrote:
>>>>> jevents.c is large, has a dependency on an old forked version of jsmn,
>>>>> and is challenging to work upon. A lot of jevents.c's complexity comes
>>>>> from needing to write json and csv parsing from first principles. In
>>>>> contrast python has this functionality in standard libraries and is
>>>>> already a build pre-requisite for tools like asciidoc (that builds all
>>>>> of the perf man pages).
>>>>>
>>>>> Introduce jevents.py that produces identical output to jevents.c. Add a
>>>>> test that runs both converter tools and validates there are no output
>>>>> differences. The test can be invoked with a phony build target like:
>>>>>
>>>>> make -C tools/perf jevents-py-test
>>>>>
>>>>> The python code deliberately tries to replicate the behavior of
>>>>> jevents.c so that the output matches and transitioning tools shouldn't
>>>>> introduce regressions. In some cases the code isn't as elegant as hoped,
>>>>> but fixing this can be done as follow up.
>>>>>
>>>>> Signed-off-by: Ian Rogers <irogers@google.com>
>>>>> ---
>>>>>     tools/perf/Makefile.perf              |   6 +
>>>>>     tools/perf/pmu-events/jevents-test.sh |  33 +++
>>>>>     tools/perf/pmu-events/jevents.py      | 394 ++++++++++++++++++++++++++
>>>>>     3 files changed, 433 insertions(+)
>>>>>     create mode 100755 tools/perf/pmu-events/jevents-test.sh
>>>>>     create mode 100755 tools/perf/pmu-events/jevents.py
>>>>>
>>>>> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
>>>>> index 8f738e11356d..1e29c8936f71 100644
>>>>> --- a/tools/perf/Makefile.perf
>>>>> +++ b/tools/perf/Makefile.perf
>>>>> @@ -669,6 +669,12 @@ $(JEVENTS_IN): FORCE
>>>>>     $(JEVENTS): $(JEVENTS_IN)
>>>>>         $(QUIET_LINK)$(HOSTCC) $(JEVENTS_IN) -o $@
>>>>>
>>>>> +JEVENTS_PY   :=  pmu-events/jevents.py
>>>>> +JEVENTS_PY_TEST      :=  pmu-events/jevents-test.sh
>>>>> +.PHONY: jevents-py-test
>>>>> +jevents-py-test: $(JEVENTS)
>>>>> +     $(Q)$(call echo-cmd,gen)$(JEVENTS_PY_TEST) $(JEVENTS) $(JEVENTS_PY) pmu-events/arch
>>>>> +
>>>>>     $(PMU_EVENTS_IN): $(JEVENTS) FORCE
>>>>>         $(Q)$(MAKE) -f $(srctree)/tools/build/Makefile.build dir=pmu-events obj=pmu-events
>>>>>
>>>>> diff --git a/tools/perf/pmu-events/jevents-test.sh b/tools/perf/pmu-events/jevents-test.sh
>>>>> new file mode 100755
>>>>> index 000000000000..9ae852292576
>>>>> --- /dev/null
>>>>> +++ b/tools/perf/pmu-events/jevents-test.sh
>>>>> @@ -0,0 +1,33 @@
>>>>> +#!/bin/sh
>>>>> +# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
>>>>> +# Validate that the legacy jevents and jevents.py produce identical output.
>>>>> +set -e
>>>>> +
>>>>> +JEVENTS="$1"
>>>>> +JEVENTS_PY="$2"
>>>>> +ARCH_PATH="$3"
>>>>> +JEVENTS_C_GENERATED=$(mktemp /tmp/jevents_c.XXXXX.c)
>>>>> +JEVENTS_PY_GENERATED=$(mktemp /tmp/jevents_py.XXXXX.c)
>>>>> +
>>>>> +cleanup() {
>>>>> +  rm "$JEVENTS_C_GENERATED" "$JEVENTS_PY_GENERATED"
>>>>> +  trap - exit term int
>>>>> +}
>>>>> +trap cleanup exit term int
>>>>> +
>>>>> +for path in "$ARCH_PATH"/*
>>>>> +do
>>>>> +  arch=$(basename $path)
>>>>> +  if [ "$arch" = "test" ]
>>>>> +  then
>>>>> +    continue
>>>>> +  fi
>>>>> +  echo "Checking architecture: $arch"
>>>>> +  echo "Generating using jevents.c"
>>>>> +  "$JEVENTS" "$arch" "$ARCH_PATH" "$JEVENTS_C_GENERATED"
>>>>> +  echo "Generating using jevents.py"
>>>>> +  "$JEVENTS_PY" "$arch" "$ARCH_PATH" "$JEVENTS_PY_GENERATED"
>>>>> +  echo "Diffing"
>>>>> +  diff -u "$JEVENTS_C_GENERATED" "$JEVENTS_PY_GENERATED"
>>>>> +done
>>>>> +cleanup
>>>>> diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
>>>>> new file mode 100755
>>>>> index 000000000000..658eb2696f9a
>>>>> --- /dev/null
>>>>> +++ b/tools/perf/pmu-events/jevents.py
>>>>> @@ -0,0 +1,394 @@
>>>>> +#!/usr/bin/env python3
>>>>> +# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
>>>>> +"""Convert directories of JSON events to C code."""
>>>>> +import argparse
>>>>> +import csv
>>>>> +import json
>>>>> +import os
>>>>> +import sys
>>>>> +from typing import Callable
>>>>> +
>>>>> +# Global command line arguments.
>>>>> +args = None
>>>>> +# List of event tables generated from "/sys" directories.
>>>>> +sys_event_tables = []
>>>>> +# Map from an event name to an architecture standard
>>>>> +# JsonEvent. Architecture standard events are in json files in the top
>>>>> +# f'{args.starting_dir}/{args.arch}' directory.
>>>>> +arch_std_events = dict()
>>>>> +# Track whether an events table is currently being defined and needs closing.
>>>>> +close_table = False
>>>>> +
>>>>> +
>>>>> +def file_name_to_table_name(parents: list[str], dirname: str) -> str:
>>>>> +  """Generate a C table name from directory names."""
>>>>> +  tblname = 'pme'
>>>>> +  for p in parents:
>>>>> +    tblname += '_' + p
>>>>> +  tblname += '_' + dirname
>>>>> +  return tblname.replace('-', '_')
>>>>> +
>>>>> +
>>>>> +class JsonEvent:
>>>>> +  """Representation of an event loaded from a json file dictionary."""
>>>>> +
>>>>> +  def __init__(self, dict):
>>>>> +    """Constructor passed the dictionary of parsed json values."""
>>>>> +
>>>>> +    def llx(x: int) -> str:
>>>>> +      """Convert an int to a string similar to a printf modifier of %#llx."""
>>>>> +      return '0' if x == 0 else hex(x)
>>>>> +
>>>>> +    def fixdesc(s: str) -> str:
>>>>> +      """Fix formatting issue for the desc string."""
>>>>> +      if s is None:
>>>>> +        return None
>>>>> +      return s.removesuffix('.  ').removesuffix('. ').removesuffix('.').replace(
>>>>> +          '\n', '\\n').replace('\"', '\\"').replace('\r', '\\r')
>>>>> +
>>>>> +    def convert_aggr_mode(aggr_mode: str) -> str:
>>>>> +      """Returns the aggr_mode_class enum value associated with the JSON string."""
>>>>> +      if not aggr_mode:
>>>>> +        return None
>>>>> +      aggr_mode_to_enum = {
>>>>> +          'PerChip': '1',
>>>>> +          'PerCore': '2',
>>>>> +      }
>>>>> +      return aggr_mode_to_enum[aggr_mode]
>>>>> +
>>>>> +    def lookup_msr(num: str) -> str:
>>>>> +      """Converts the msr number, or first in a list to the appropriate event field."""
>>>>> +      if not num:
>>>>> +        return None
>>>>> +      msrmap = {
>>>>> +          0x3F6: 'ldlat=',
>>>>> +          0x1A6: 'offcore_rsp=',
>>>>> +          0x1A7: 'offcore_rsp=',
>>>>> +          0x3F7: 'frontend=',
>>>>> +      }
>>>>> +      return msrmap[int(num.split(',', 1)[0], 0)]
>>>>> +
>>>>> +    def real_event(name: str, event: str) -> str:
>>>>> +      """Convert well known event names to an event string otherwise use the event argument."""
>>>>> +      fixed = {
>>>>> +          'inst_retired.any': 'event=0xc0,period=2000003',
>>>>> +          'inst_retired.any_p': 'event=0xc0,period=2000003',
>>>>> +          'cpu_clk_unhalted.ref': 'event=0x0,umask=0x03,period=2000003',
>>>>> +          'cpu_clk_unhalted.thread': 'event=0x3c,period=2000003',
>>>>> +          'cpu_clk_unhalted.core': 'event=0x3c,period=2000003',
>>>>> +          'cpu_clk_unhalted.thread_any': 'event=0x3c,any=1,period=2000003',
>>>>> +      }
>>>>> +      if not name:
>>>>> +        return None
>>>>> +      if name.lower() in fixed:
>>>>> +        return fixed[name.lower()]
>>>>> +      return event
>>>>> +
>>>>> +    def unit_to_pmu(unit: str) -> str:
>>>>> +      """Convert a JSON Unit to Linux PMU name."""
>>>>> +      if not unit:
>>>>> +        return None
>>>>> +      # Comment brought over from jevents.c:
>>>>> +      # it's not realistic to keep adding these, we need something more scalable ...
>>>>> +      table = {
>>>>> +          'CBO': 'uncore_cbox',
>>>>> +          'QPI LL': 'uncore_qpi',
>>>>> +          'SBO': 'uncore_sbox',
>>>>> +          'iMPH-U': 'uncore_arb',
>>>>> +          'CPU-M-CF': 'cpum_cf',
>>>>> +          'CPU-M-SF': 'cpum_sf',
>>>>> +          'UPI LL': 'uncore_upi',
>>>>> +          'hisi_sicl,cpa': 'hisi_sicl,cpa',
>>>>> +          'hisi_sccl,ddrc': 'hisi_sccl,ddrc',
>>>>> +          'hisi_sccl,hha': 'hisi_sccl,hha',
>>>>> +          'hisi_sccl,l3c': 'hisi_sccl,l3c',
>>>>> +          'imx8_ddr': 'imx8_ddr',
>>>>> +          'L3PMC': 'amd_l3',
>>>>> +          'DFPMC': 'amd_df',
>>>>> +          'cpu_core': 'cpu_core',
>>>>> +          'cpu_atom': 'cpu_atom',
>>>>> +      }
>>>>> +      return table[unit] if unit in table else f'uncore_{unit.lower()}'
>>>>> +
>>>>> +    eventcode = 0
>>>>> +    if 'EventCode' in dict:
>>>>> +      eventcode = int(dict['EventCode'].split(',', 1)[0], 0)
>>>>> +    if 'ExtSel' in dict:
>>>>> +      eventcode |= int(dict['ExtSel']) << 8
>>>>> +    configcode = int(dict['ConfigCode'], 0) if 'ConfigCode' in dict else None
>>>>> +    self.name = dict['EventName'].lower() if 'EventName' in dict else None
>>>>> +    self.compat = dict.get('Compat')
>>>>> +    self.desc = fixdesc(dict.get('BriefDescription'))
>>>>> +    self.long_desc = fixdesc(dict.get('PublicDescription'))
>>>>> +    precise = dict.get('PEBS')
>>>>> +    msr = lookup_msr(dict.get('MSRIndex'))
>>>>> +    msrval = dict.get('MSRValue')
>>>>> +    extra_desc = ''
>>>>> +    if 'Data_LA' in dict:
>>>>> +      extra_desc += '  Supports address when precise'
>>>>> +      if 'Errata' in dict:
>>>>> +        extra_desc += '.'
>>>>> +    if 'Errata' in dict:
>>>>> +      extra_desc += '  Spec update: ' + dict['Errata']
>>>>> +    self.pmu = unit_to_pmu(dict.get('Unit'))
>>>>> +    filter = dict.get('Filter')
>>>>> +    self.unit = dict.get('ScaleUnit')
>>>>> +    self.perpkg = dict.get('PerPkg')
>>>>> +    self.aggr_mode = convert_aggr_mode(dict.get('AggregationMode'))
>>>>> +    self.deprecated = dict.get('Deprecated')
>>>>> +    self.metric_name = dict.get('MetricName')
>>>>> +    self.metric_group = dict.get('MetricGroup')
>>>>> +    self.metric_constraint = dict.get('MetricConstraint')
>>>>> +    self.metric_expr = dict.get('MetricExpr')
>>>>> +    if self.metric_expr:
>>>>> +      self.metric_expr = self.metric_expr.replace('\\', '\\\\')
>>>>> +    arch_std = dict.get('ArchStdEvent')
>>>>> +    if precise and self.desc and not '(Precise Event)' in self.desc:
>>>>> +      extra_desc += ' (Must be precise)' if precise == '2' else (' (Precise '
>>>>> +                                                                 'event)')
>>>>> +    event = f'config={llx(configcode)}' if configcode is not None else f'event={llx(eventcode)}'
>>>>> +    event_fields = [
>>>>> +        ('AnyThread', 'any='),
>>>>> +        ('PortMask', 'ch_mask='),
>>>>> +        ('CounterMask', 'cmask='),
>>>>> +        ('EdgeDetect', 'edge='),
>>>>> +        ('FCMask', 'fc_mask='),
>>>>> +        ('Invert', 'inv='),
>>>>> +        ('SampleAfterValue', 'period='),
>>>>> +        ('UMask', 'umask='),
>>>>> +    ]
>>>>> +    for key, value in event_fields:
>>>>> +      if key in dict and dict[key] != '0':
>>>>> +        event += ',' + value + dict[key]
>>>>> +    if filter:
>>>>> +      event += f',{filter}'
>>>>> +    if msr:
>>>>> +      event += f',{msr}{msrval}'
>>>>> +    if self.desc and extra_desc:
>>>>> +      self.desc += extra_desc
>>>>> +    if self.long_desc and extra_desc:
>>>>> +      self.long_desc += extra_desc
>>>>> +    if self.pmu:
>>>>> +      if self.desc and not self.desc.endswith('. '):
>>>>> +        self.desc += '. '
>>>>> +      self.desc = (self.desc if self.desc else '') + ('Unit: ' + self.pmu + ' ')
>>>>> +    if arch_std and arch_std.lower() in arch_std_events:
>>>>> +      event = arch_std_events[arch_std.lower()].event
>>>>> +      # Copy from the architecture standard event to self for undefined fields.
>>>>> +      for attr, value in arch_std_events[arch_std.lower()].__dict__.items():
>>>>> +        if hasattr(self, attr) and not getattr(self, attr):
>>>>> +          setattr(self, attr, value)
>>>>> +
>>>>> +    self.event = real_event(self.name, event)
>>>>> +
>>>>> +  def __repr__(self) -> str:
>>>>> +    """String representation primarily for debugging."""
>>>>> +    s = '{\n'
>>>>> +    for attr, value in self.__dict__.items():
>>>>> +      if value:
>>>>> +        s += f'\t{attr} = {value},\n'
>>>>> +    return s + '}'
>>>>> +
>>>>> +  def ToCString(self, topic_local: str) -> str:
>>>>> +    """Representation of the event as a C struct initializer."""
>>>>> +
>>>>> +    def AttrString(attr: str, value: str) -> str:
>>>>> +      return '\t.%s = \"%s\",\n' % (attr, value)
>>>>> +
>>>>> +    def StrIfPresent(self, attr: str) -> str:
>>>>> +      if not getattr(self, attr):
>>>>> +        return ''
>>>>> +      return AttrString(attr, getattr(self, attr))
>>>>> +
>>>>> +    s = '{\n'
>>>>> +    for attr in ['name', 'event']:
>>>>> +      s += StrIfPresent(self, attr)
>>>>> +    if self.desc is not None:
>>>>> +      s += AttrString('desc', self.desc)
>>>>> +    else:
>>>>> +      s += AttrString('desc', '(null)')
>>>>> +    s += StrIfPresent(self, 'compat')
>>>>> +    s += f'\t.topic = "{topic_local}",\n'
>>>>> +    for attr in [
>>>>> +        'long_desc', 'pmu', 'unit', 'perpkg', 'aggr_mode', 'metric_expr',
>>>>> +        'metric_name', 'metric_group', 'deprecated', 'metric_constraint'
>>>>> +    ]:
>>>>> +      s += StrIfPresent(self, attr)
>>>>> +    s += '},\n'
>>>>> +    return s
>>>>> +
>>>>> +
>>>>> +def read_json_events(path: str) -> list[JsonEvent]:
>>>>> +  """Read json events from the specified file."""
>>>>> +  return json.load(open(path), object_hook=lambda d: JsonEvent(d))
>>>>> +
>>>>> +def preprocess_arch_std_files(archpath: str) -> None:
>>>>> +  """Read in all architecture standard events."""
>>>>> +  global arch_std_events
>>>>> +  for item in os.scandir(archpath):
>>>>> +    if item.is_file() and item.name.endswith('.json'):
>>>>> +      for event in read_json_events(item.path):
>>>>> +        if event.name:
>>>>> +          arch_std_events[event.name.lower()] = event
>>>>> +
>>>>> +
>>>>> +def print_events_table_prefix(tblname: str) -> None:
>>>>> +  """Called when a new events table is started."""
>>>>> +  global close_table
>>>>> +  if close_table:
>>>>> +    raise IOError('Printing table prefix but last table has no suffix')
>>>>> +  args.output_file.write('static const struct pmu_event %s[] = {\n' % tblname)
>>>>> +  close_table = True
>>>>> +
>>>>> +
>>>>> +def print_events_table_entries(item: os.DirEntry, topic: str) -> None:
>>>>> +  """Create contents of an events table."""
>>>>> +  if not close_table:
>>>>> +    raise IOError('Table entries missing prefix')
>>>>> +  for event in read_json_events(item.path):
>>>>> +    args.output_file.write(event.ToCString(topic))
>>>>> +
>>>>> +def print_events_table_suffix() -> None:
>>>>> +  """Optionally close events table."""
>>>>> +  global close_table
>>>>> +  if close_table:
>>>>> +    args.output_file.write("""{
>>>>> +\t.name = 0,
>>>>> +\t.event = 0,
>>>>> +\t.desc = 0,
>>>>> +},
>>>>> +};
>>>>> +""")
>>>>> +  close_table = False
>>>>> +
>>>>> +def process_one_file(parents: list[str], item: os.DirEntry) -> None:
>>>>> +  """Process a JSON file during the main walk."""
>>>>> +  global sys_event_tables
>>>>> +
>>>>> +  def get_topic(topic: str) -> str:
>>>>> +    return topic.removesuffix('.json').replace('-', ' ')
>>>>> +
>>>>> +  def is_leaf_dir(path: str) -> bool:
>>>>> +    for item in os.scandir(path):
>>>>> +      if item.is_dir():
>>>>> +        return False
>>>>> +    return True
>>>>> +
>>>>> +  # model directory, reset topic
>>>>> +  if item.is_dir() and is_leaf_dir(item.path):
>>>>> +    print_events_table_suffix()
>>>>> +
>>>>> +    tblname = file_name_to_table_name(parents, item.name)
>>>>> +    if item.name == 'sys':
>>>>> +      sys_event_tables.append(tblname)
>>>>> +    print_events_table_prefix(tblname)
>>>>> +    return
>>>>> +
>>>>> +  # base dir or too deep
>>>>> +  level = len(parents)
>>>>> +  if level == 0 or level > 4:
>>>>> +    return
>>>>> +
>>>>> +  # Ignore other directories. If the file name does not have a .json
>>>>> +  # extension, ignore it. It could be a readme.txt for instance.
>>>>> +  if not item.is_file() or not item.name.endswith('.json'):
>>>>> +    return
>>>>> +
>>>>> +  print_events_table_entries(item, get_topic(item.name))
>>>>> +
>>>>> +
>>>>> +def print_mapping_table() -> None:
>>>>> +  """Read the mapfile and generate the struct from cpuid string to event table."""
>>>>> +  table = csv.reader(open(f'{args.starting_dir}/{args.arch}/mapfile.csv'))
>>>>> +  args.output_file.write('const struct pmu_events_map pmu_events_map[] = {\n')
>>>>> +  first = True
>>>>> +  for row in table:
>>>>> +    # Skip the first row or any row beginning with #.
>>>>> +    if not first and len(row) > 0 and not row[0].startswith('#'):
>>>>> +      tblname = file_name_to_table_name([], row[2].replace('/', '_'))
>>>>> +      args.output_file.write("""{
>>>>> +\t.cpuid = \"%s\",
>>>>> +\t.version = \"%s\",
>>>>> +\t.type = \"%s\",
>>>>> +\t.table = %s
>>>>> +},
>>>>> +""" % (row[0].replace('\\', '\\\\'), row[1], row[3], tblname))
>>>>> +    first = False
>>>>> +
>>>>> +  args.output_file.write("""{
>>>>> +\t.cpuid = "testcpu",
>>>>> +\t.version = "v1",
>>>>> +\t.type = "core",
>>>>> +\t.table = pme_test_soc_cpu,
>>>>> +},
>>>>> +{
>>>>> +\t.cpuid = 0,
>>>>> +\t.version = 0,
>>>>> +\t.type = 0,
>>>>> +\t.table = 0,
>>>>> +},
>>>>> +};
>>>>> +""")
>>>>> +
>>>>> +
>>>>> +def print_system_mapping_table() -> None:
>>>>> +  """C struct mapping table array for tables from /sys directories."""
>>>>> +  args.output_file.write(
>>>>> +      '\nconst struct pmu_sys_events pmu_sys_event_tables[] = {\n')
>>>>> +  for tblname in sys_event_tables:
>>>>> +    args.output_file.write("""\t{
>>>>> +\t\t.table = %s,
>>>>> +\t\t.name = \"%s\",
>>>>> +\t},
>>>>> +""" % (tblname, tblname))
>>>>> +  args.output_file.write("""\t{
>>>>> +\t\t.table = 0
>>>>> +\t},
>>>>> +};
>>>>> +""")
>>>>> +
>>>>> +
>>>>> +def main() -> None:
>>>>> +  global args
>>>>> +
>>>>> +  def dir_path(path: str) -> str:
>>>>> +    """Validate path is a directory for argparse."""
>>>>> +    if os.path.isdir(path):
>>>>> +      return path
>>>>> +    else:
>>>>> +      raise argparse.ArgumentTypeError(f'\'{path}\' is not a valid directory')
>>>>> +
>>>>> +  def ftw(path: str, parents: list[str],
>>>>> +          action: Callable[[list[str], os.DirEntry], None]) -> None:
>>>>> +    """Replicate the directory/file walking behavior of C's file tree walk."""
>>>>> +    for item in os.scandir(path):
>>>>> +      action(parents, item)
>>>>> +      if item.is_dir():
>>>>> +        ftw(item.path, parents + [item.name], action)
>>>>> +
>>>>> +  ap = argparse.ArgumentParser()
>>>>> +  ap.add_argument('arch', help='Architecture name like x86')
>>>>> +  ap.add_argument(
>>>>> +      'starting_dir',
>>>>> +      type=dir_path,
>>>>> +      help='Root of tree containing architecture directories containing json files'
>>>>> +  )
>>>>> +  ap.add_argument(
>>>>> +      'output_file', type=argparse.FileType('w'), nargs='?', default=sys.stdout)
>>>>> +  args = ap.parse_args()
>>>>> +
>>>>> +  args.output_file.write("#include \"pmu-events/pmu-events.h\"\n")
>>>>> +  for path in [args.arch, 'test']:
>>>>> +    arch_path = f'{args.starting_dir}/{path}'
>>>>> +    if not os.path.isdir(arch_path):
>>>>> +      raise IOError(f'Missing architecture directory in \'{arch_path}\'')
>>>>> +    preprocess_arch_std_files(arch_path)
>>>>> +    ftw(arch_path, [], process_one_file)
>>>>> +    print_events_table_suffix()
>>>>> +
>>>>> +  print_mapping_table()
>>>>> +  print_system_mapping_table()
>>>>> +
>>>>> +
>>>>> +if __name__ == '__main__':
>>>>> +  main()
>>>>
>>>> --
>>>> Zhengjun Xing
>>
>> --
>> Zhengjun Xing

-- 
Zhengjun Xing