From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72C683F0A81 for ; Mon, 20 Jul 2026 11:04:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784545465; cv=none; b=MtfGjs7dnLQTfnJr3fTk5f93sivfVuTeBfvv9TEfn1O/Wv3qzw+okdU/sQzMbZmGGXEw/X/GIMQCGDWClxmu1Wnmx9D2yFKgGVP28pigz8BpL/8cQF65wLUX1LdS8lTW5Mr/H+LJbu+9W4Shqq1SiNDyvFsjGHd+2sV8ezhgV/4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784545465; c=relaxed/simple; bh=L4LEmWgcYx/YH2a2dvc24fLT0RXGtTKtz1m58oPNtrE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=iuXiu4072XxR8jRJE9s0anC+nbh05Y4Nopb1Y+uGpejGOWoEiPWE/mbmGljI9Ks72MssWWRMJpW1i4B8MI9nAd+Y1OEdZRVxRRizVGxuSxa+qwluxQu1bwq5avFoOoptfIY1bNNNa82iG8eA+1Sj88b1UkzjXs+dUDg8za+zmxE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=SB5lSv68; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="SB5lSv68" Received: from pps.filterd (m0356516.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 66KACBtf1826407; Mon, 20 Jul 2026 11:04:06 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:message-id:mime-version :subject:to; s=pp1; bh=DlGX67Kh1j9/71U/OVOcdyBnPuJRuYUIJbq1UIoyf fE=; b=SB5lSv68negbOxuK2yL0XGjZUWGdGRA1MbY0eLLlh7NUK+O3IEfSUhRiY slu4vaclJblnmCGujSdCwKT1IViVn/evQvYb+X0qfeAvsejY8UtLKUqKuGlIqSnJ oBNJc97yr92Ow2ky7uIjV15modFDKDv0NtqQKgkrauX67uuCMd/nh/etBdQlkWpo 3nZ7sOsBurGeFiIXJBDjjgBm+AmgppKevIVWEyL3t31jCrl0oAsMlTiy+H5o6m/5 BOtIqgOC1e/YwcJCsecFQrAlgggwVhsg948HvAc6gf6BKTo5XuqWUJCc/8g+TT+Q o1P5NHhEr/CzLNuE//XOTHKq6EHnQ== Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4fg77jxub1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Jul 2026 11:04:05 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 66KAndEg028090; Mon, 20 Jul 2026 11:04:04 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 4fgp1g52yc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Jul 2026 11:04:04 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (smtpav07.fra02v.mail.ibm.com [10.20.54.106]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 66KB40IS50659626 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 20 Jul 2026 11:04:00 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B409820043; Mon, 20 Jul 2026 11:04:00 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 690702004B; Mon, 20 Jul 2026 11:03:57 +0000 (GMT) Received: from localhost.localdomain (unknown [9.39.16.54]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 20 Jul 2026 11:03:57 +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 V2 0/6] tools/perf: Add powerpc HTM auxtrace support Date: Mon, 20 Jul 2026 16:22:12 +0530 Message-Id: <20260720105218.14277-1-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-Authority-Analysis: v=2.4 cv=HJXz0Itv c=1 sm=1 tr=0 ts=6a5e00a5 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=RE6roZah17OqO2nNXcEA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIwMDExOSBTYWx0ZWRfXzHRzjUTPXD0M xCi9EeXxw7GtXZw37B5T02b5e1OQahsOnzmtnXizwf0kcTZ2Y5X6LSuNuP5jzx1wAurnFizyhH5 e7EFXyriA5BnjJikI1lMDIF/gwbFKBEZl1to5MTlSwvxOKrwRaLNDfwtaiEA/sw3uue8ovAy0Pc wJKMMoHaTh89w9lLVACr8K9Cw0qmQkmN3UEW5spI9gCV+U6xGQVBqWh7OraolL8Cx1JhznUNU3s hWO9MZNG/y3ObfRoci7d6PzJLSvaOxPgZ6lBYu+TXf0EsWgrxvMU33kQztRThZpIrKaiDVeTBdn LsmT9x5+4jyRAX/VT0HORlaK+mfQyQ/4jH0WeJuQLtvl9TniLgpvKhxoxlaZcu8bObyGWC2SM1W FijjZKccEdTmougpaYFkyJPBcE9n7RQ9HZYbm92F00QJ912D1GXIfh7uYYdJ5C/N0i/bF80+vNE SnXa7UNuwESIwQaSRbA== X-Proofpoint-ORIG-GUID: sfy3SHClcfUcXO05WPEjZHYV-6OiRirw X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIwMDExOSBTYWx0ZWRfXwmv+DE0kuqgu ny4Ins55SlLY19FBcHp1sNgygCgkj1B/Va2OEKB0f0C4IikHxeVgcAH1/VPCkYac/UY7ox4Vs0b RYqtKulUJY5baGEdqOiGNzPIIxrhPik= X-Proofpoint-GUID: _CpkRGZkExqeMNw-hy4wV8FAE7sQZnmk 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=2026-07-20_02,2026-07-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 malwarescore=0 impostorscore=0 clxscore=1015 phishscore=0 spamscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607200119 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 htmdecoder. 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 1 while data is staged in its internal buffers and to 0 once the stream is exhausted. 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 and parsed the translation.* - Synthetic sample generation: V1 patches 8 and 9 created a PERF_TYPE_SYNTH event named "htm", injected synthetic perf samples 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/20260720104447.11843-1-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 | 93 +----- tools/perf/arch/powerpc/util/evsel.c | 69 ++++ tools/perf/arch/powerpc/util/htm.c | 169 ++++++++++ tools/perf/arch/powerpc/util/vpa-dtl.c | 95 ++++++ tools/perf/builtin-record.c | 45 +++ tools/perf/util/Build | 1 + tools/perf/util/auxtrace.c | 4 + tools/perf/util/auxtrace.h | 1 + tools/perf/util/powerpc-htm.c | 415 ++++++++++++++++++++++++ tools/perf/util/powerpc-htm.h | 43 +++ tools/perf/util/powerpc-vpadtl.h | 1 + tools/perf/util/record.h | 3 + 13 files changed, 865 insertions(+), 76 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