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Wed, 29 Jul 2026 12:44:02 +0000 (GMT) Received: from localhost.localdomain (unknown [9.39.22.136]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 29 Jul 2026 12:44:01 +0000 (GMT) From: Athira Rajeev To: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, maddy@linux.ibm.com, irogers@google.com, namhyung@kernel.org Cc: linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, atrajeev@linux.ibm.com, hbathini@linux.vnet.ibm.com, tejas05@linux.ibm.com, tshah@linux.ibm.com, venkat88@linux.ibm.com, usha.r2@ibm.com Subject: [PATCH V4 0/6] tools/perf: Add powerpc HTM auxtrace support Date: Wed, 29 Jul 2026 18:13:54 +0530 Message-Id: <20260729124400.65009-1-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: gjpu4VuNDMMFoCJlb-xD_aAuJd466ILn X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI5MDEwMiBTYWx0ZWRfX6hD9XmPe3T5r 4ICg/RHq0cq4U8J/+8TFchaRE/TuSpRbPf5DzAIUonCjVBvIra5HlOQXQhXBEvQq+LUwNUjJgC6 Oy6EUqGonQG/Bni3g2VHmBcvKjp96KZgPjrOC/s+v+G/b3EI2fWURjq4zRgFUkQ0pPKGMjMzO6t ODDlJK94iJy7v9hJQrHaJvibcjhL5ucsMUNYfYSAXv+3WDswOdzU5YV6COYID4w+RRAXB7KydIh PqReQjM3Or7bmAeX/V65nybzn3PMQRkkzt0Bh4pctgou2AFfzpd0z05kGe2qLEOXmEMlf2X+v06 GjXlROYuKMS94Ypzo3UxWlJqnPa2APDDcly83U3oORhS/j3aeahlCZzmnkWO1kgs/qArlPaU6W0 1FPUkoHOkutKBVuLhzh2IsKB6CYB2iaC03FUZ+bI2izEY+UgJshYDbt72S3JTyd8cwiYOj1WXtS TeGBheV12OeyW/rBp1g== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI5MDEwMiBTYWx0ZWRfX+vTCRHCYpOWa hwEhtkhpWA9sDwkwN9p/yj0JIad6tuMQ93rkzUmdVA2ebkQ7k3SYm9iMphoQGIJ7hDCHhPstgok oJeVlxZlmYyOiWnJ1xtfuKEJTnLvRzw= X-Authority-Analysis: v=2.4 cv=AZeB2XXG c=1 sm=1 tr=0 ts=6a69f59a cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=Lql3lfElDkBJbt6mtbwA:9 X-Proofpoint-GUID: _CNZh1BRC7Tpyc9Y5bBn9X8HBiw-aJTA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-29_04,2026-07-28_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 phishscore=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 suspectscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607290102 Overview: This series adds perf tool support for capturing and processing Hardware Trace Macro (HTM) trace data on POWER systems. HTM exposes raw bus-trace data via the H_HTM hypervisor call. The kernel-side HTM PMU driver (submitted separately) streams this data into perf AUX buffers and emits memory configuration as PERF_SAMPLE_RAW records. This series wires up the record and report sides in the perf tool so that 'perf record' collects HTM data and 'perf report' writes the trace and memory configuration to files ready for post-processing with htmdecode. Patch overview: Patch 1 refactors the existing powerpc auxtrace dispatch. All VPA-DTL recording logic is moved from arch/powerpc/util/auxtrace.c into its own file, arch/powerpc/util/vpa-dtl.c, leaving auxtrace_record__init() as a thin per-PMU dispatcher. This is a prerequisite for adding the HTM recording path cleanly. Patch 2 adds the HTM recording path (arch/powerpc/util/htm.c and util/powerpc-htm.h). htm_recording_init() sets up the auxtrace_record callbacks. htm_info_fill() stores the PMU type and a (cpu, attr.config) pair for each htm evsel into the PERF_RECORD_AUXTRACE_INFO priv[] area. The decode side reads these back to map each AUX buffer to its (node, chip, core) target using event->auxtrace.cpu. PERF_SAMPLE_RAW is also enabled here so that memory configuration records are captured alongside the AUX stream. Patch 3 adds a generic weak arch_perf_record__need_read() hook in builtin-record.c. When the hook returns non-zero, perf record performs an extra mmap-read pass before disabling events. The drain loop runs until the hook returns 0 or no forward progress is made, then the events are disabled and closed normally. Patch 4 implements arch_perf_record__need_read() for powerpc. It reads event->count for all open htm evsels via perf_evsel__read() and accumulates the values. The kernel driver sets this count to the number of 128-byte HTM trace records written on a successful dump, 1 when the AUX buffer is temporarily full but the hypervisor stream is intact, and 0 once the stream is exhausted or a hard error occurs. A non-zero total causes the recording loop to perform another read pass. Patch 5 adds PERF_AUXTRACE_POWERPC_HTM to the auxtrace_type enum and wires the dispatch in perf_event__process_auxtrace_info(). It also amends htm_info_fill() to set auxtrace_info->type now that the constant is available. Patch 6 adds the full HTM decode path in util/powerpc-htm.c. powerpc_htm_process_auxtrace_info() reads the (cpu, config) pairs from priv[] and builds a cpu_configs[] lookup table. As each PERF_RECORD_AUXTRACE event arrives, process_auxtrace_event() maps it to the correct target and writes the data to htm.bin.nX.pX.cX immediately. PERF_RECORD_SAMPLE RAW records are written to translation.nX.pX.cX by process_event(). Per-run first-write tracking (htm_target_seen) ensures O_TRUNC on the first write and O_APPEND on subsequent writes. Patches not included in V2: Three patches present in V1 are intentionally dropped from this series and will be submitted as a follow-on once the core infrastructure gets integrated: - htmdecode integration: V1 patch 6 invoked the external htmdecode tool via fork/exec after writing htm.bin.* to decode the raw bus-trace data in-process. This is deferred because the interface between perf and an external decode tool needs more discussion. - Physical-to-logical address mapping: V1 patch 7 read the current partition ID from /proc/powerpc/lparcfg, parsed the translation.* memory map entries, and mapped physical addresses in the decoded trace to logical addresses within the LPAR. - Synthetic sample generation: V1 patches 8 and 9 created a PERF_TYPE_SYNTH event named "htm", injected synthetic perf samples with the translated logical addresses as sample IP, and wrote a separate .out.l file with logical addresses alongside the decoded trace. The appropriate abstraction for synthetic HTM samples in the perf tool requires further discussion. Usage example: Collect HTM trace data from a single chip target: # perf record -C 9 -m,256 \ -e htm/nodalchipindex=2,nodeindex=0,htm_type=1/ sleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 256.277 MB perf.data ] # perf report Output files written by perf report: htm.bin.n0.p2.c0 raw HTM bus-trace data translation.n0.p2.c0 memory configuration records Multiple targets can be collected simultaneously: # perf record -m,256 \ -e htm/nodalchipindex=2,nodeindex=0,htm_type=1,cpu=8/ \ -e htm/nodalchipindex=1,nodeindex=0,htm_type=1,cpu=9/ \ -a sleep 10 Testing: Tested on POWER10. Both htm.bin.* and translation.* files are produced correctly for single and dual target collection. Note: Link to kernel patches: https://lore.kernel.org/linuxppc-dev/20260729123752.63010-1-atrajeev@linux.ibm.com/T/#t Athira Rajeev (6): tools/perf: Move powerpc VPA-DTL auxtrace init into a separate file tools/perf: Add AUXTRACE recording support for powerpc HTM tools/perf: Add arch hook to drain remaining data before event close tools/perf: Add powerpc callback support for arch_perf_record__need_read tools/perf: Add powerpc HTM auxtrace event processing support tools/perf: Add perf tool support for processing powerpc HTM AUXTRACE records tools/perf/arch/powerpc/util/Build | 2 + tools/perf/arch/powerpc/util/auxtrace.c | 97 ++---- tools/perf/arch/powerpc/util/evsel.c | 55 +++ tools/perf/arch/powerpc/util/htm.c | 171 +++++++++ tools/perf/arch/powerpc/util/vpa-dtl.c | 96 +++++ tools/perf/builtin-record.c | 77 ++++ tools/perf/util/Build | 1 + tools/perf/util/auxtrace.c | 4 + tools/perf/util/auxtrace.h | 1 + tools/perf/util/powerpc-htm.c | 446 ++++++++++++++++++++++++ tools/perf/util/powerpc-htm.h | 43 +++ tools/perf/util/powerpc-vpadtl.h | 1 + tools/perf/util/record.h | 3 + 13 files changed, 925 insertions(+), 72 deletions(-) create mode 100644 tools/perf/arch/powerpc/util/htm.c create mode 100644 tools/perf/arch/powerpc/util/vpa-dtl.c create mode 100644 tools/perf/util/powerpc-htm.c create mode 100644 tools/perf/util/powerpc-htm.h -- 2.43.0