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Mon, 20 Jul 2026 11:04:01 +0000 (GMT) Received: from localhost.localdomain (unknown [9.39.16.54]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 20 Jul 2026 11:04:00 +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 1/6] tools/perf: Move powerpc VPA-DTL auxtrace init into a separate file Date: Mon, 20 Jul 2026 16:22:13 +0530 Message-Id: <20260720105218.14277-2-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260720105218.14277-1-atrajeev@linux.ibm.com> References: <20260720105218.14277-1-atrajeev@linux.ibm.com> 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: hOH7O4QIXNN69SO5GUKjCvklRhcQ90SK X-Proofpoint-Spam-Info: AW1haW4tMjYwNzIwMDExOSBTYWx0ZWRfXwtEFEceJYzj+ pVR2UFgfa9hAEPSn9N1Jchzy4JpEmToOKwyhpthkqVsbTmHfGmJ/P+mxbNijuUQBQLqTBWeIn8P UmQ3E6/VY0ep/ZhAuvRgifSF4nfrmJ0= X-Proofpoint-GUID: HodnxdbkklGz034dZZboGJgZFLCvTLLJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzIwMDExOSBTYWx0ZWRfX1HqQCUbmPPip dz0l6rAj6YgeBhLxm9mHU9FFkOkmDgO1jwnPeaNDJC2AIOCUkGwIDKmfihKU7j/GX7v2kmDtzWJ Ig4l9RvY7pdrh08nJd3LHZal6rqwsZ3HR1gUoDmybFBTXBGp/j5AKIqlew8BgUk323YWieDKzPM rQSX8jlbXobgdGE8bqsgrMAja8yI/1D6NmPS/O7octoJ8/xe2bIVrSMEfOHh3SEfKnaBx8lTcQ0 dqmOMg1qrPxCshOlamjfy66+ypJ2s2nfirYvR0IeqxqEqzEmOm6hads4iX8fmiVUp7yuG1Yc19W Kq6B430B0rDhVh0mttUysMZkBYxohu4+iFl7IdCgUoa6F0zxbmV3T+Y5Vgygw1RYSfSOJtoT1Z2 IwDXoDU5g7O96R/th1RDtOZcHtSrOQYT4VIchWfzcIMo/TqnYq7lKe+FUtVNVErpQg64TjrEj+n s+BP5w77n6DeaAa2HMg== X-Authority-Analysis: v=2.4 cv=K7AS2SWI c=1 sm=1 tr=0 ts=6a5e00a9 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=VnNF1IyMAAAA:8 a=MVjHk6Situ9G2c-KtHgA:9 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 lowpriorityscore=0 suspectscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 spamscore=0 phishscore=0 malwarescore=0 adultscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607200119 The powerpc auxtrace dispatch lives entirely in arch/powerpc/util/auxtrace.c. As new PMUs such as HTM are added, this file would grow to contain the recording logic for all of them. Factor out the VPA-DTL recording initializer into its own file, arch/powerpc/util/vpa-dtl.c, and reduce auxtrace.c to a thin dispatch layer. auxtrace_record__init() now detects the PMU by name and calls the appropriate per-PMU init function: - vpa_dtl_recording_init() for VPA-DTL events (unchanged behaviour) - Further PMU entries will follow in subsequent patches This makes room in auxtrace_record__init() for the HTM recording path added in the next patch without growing a single monolithic file. Signed-off-by: Athira Rajeev --- Changes in V2: - Renamed the destination file from arch/powerpc/util/vpa-dtl.c (same name, unchanged) but the subject and commit message are reworded to clearly state that the goal is to make auxtrace_record__init() a thin per-PMU dispatcher, not merely to "allow multiple PMUs to use auxtrace". - Handle failure from memory allocation - Included stdlib and limits.h - No functional change to the VPA-DTL path itself. - Patch is now 1/6 instead of 1/9. tools/perf/arch/powerpc/util/Build | 1 + tools/perf/arch/powerpc/util/auxtrace.c | 84 +++------------------- tools/perf/arch/powerpc/util/vpa-dtl.c | 95 +++++++++++++++++++++++++ tools/perf/util/powerpc-vpadtl.h | 1 + 4 files changed, 105 insertions(+), 76 deletions(-) create mode 100644 tools/perf/arch/powerpc/util/vpa-dtl.c diff --git a/tools/perf/arch/powerpc/util/Build b/tools/perf/arch/powerpc/util/Build index ae928050e07a..7819c8f5af2d 100644 --- a/tools/perf/arch/powerpc/util/Build +++ b/tools/perf/arch/powerpc/util/Build @@ -7,3 +7,4 @@ perf-util-y += evsel.o perf-util-$(CONFIG_LIBDW) += skip-callchain-idx.o perf-util-y += auxtrace.o +perf-util-y += vpa-dtl.o diff --git a/tools/perf/arch/powerpc/util/auxtrace.c b/tools/perf/arch/powerpc/util/auxtrace.c index 4600a1661b4f..e04a0bd61755 100644 --- a/tools/perf/arch/powerpc/util/auxtrace.c +++ b/tools/perf/arch/powerpc/util/auxtrace.c @@ -13,63 +13,12 @@ #include "../../util/auxtrace.h" #include "../../util/powerpc-vpadtl.h" #include "../../util/record.h" -#include // page_size - -#define KiB(x) ((x) * 1024) - -static int -powerpc_vpadtl_recording_options(struct auxtrace_record *ar __maybe_unused, - struct evlist *evlist __maybe_unused, - struct record_opts *opts) -{ - opts->full_auxtrace = true; - - /* - * Set auxtrace_mmap_pages to minimum - * two pages - */ - if (!opts->auxtrace_mmap_pages) { - opts->auxtrace_mmap_pages = KiB(128) / page_size; - if (opts->mmap_pages == UINT_MAX) - opts->mmap_pages = KiB(256) / page_size; - } - - return 0; -} - -static size_t powerpc_vpadtl_info_priv_size(struct auxtrace_record *itr __maybe_unused, - struct evlist *evlist __maybe_unused) -{ - return VPADTL_AUXTRACE_PRIV_SIZE; -} - -static int -powerpc_vpadtl_info_fill(struct auxtrace_record *itr __maybe_unused, - struct perf_session *session __maybe_unused, - struct perf_record_auxtrace_info *auxtrace_info, - size_t priv_size __maybe_unused) -{ - auxtrace_info->type = PERF_AUXTRACE_VPA_DTL; - - return 0; -} - -static void powerpc_vpadtl_free(struct auxtrace_record *itr) -{ - free(itr); -} - -static u64 powerpc_vpadtl_reference(struct auxtrace_record *itr __maybe_unused) -{ - return 0; -} struct auxtrace_record *auxtrace_record__init(struct evlist *evlist, int *err) { - struct auxtrace_record *aux; struct evsel *pos; - int found = 0; + struct evsel *vpa_dtl_evsel = NULL; /* * Set err value to zero here. Any fail later @@ -78,33 +27,16 @@ struct auxtrace_record *auxtrace_record__init(struct evlist *evlist, *err = 0; evlist__for_each_entry(evlist, pos) { - if (strstarts(pos->name, "vpa_dtl")) { - found = 1; + if (pos->name && strstarts(pos->name, "vpa_dtl")) { pos->needs_auxtrace_mmap = true; - break; + /* Remember the first matching VPA DTL event */ + if (!vpa_dtl_evsel) + vpa_dtl_evsel = pos; } } - if (!found) - return NULL; - - /* - * To obtain the auxtrace buffer file descriptor, the auxtrace event - * must come first. - */ - evlist__to_front(pos->evlist, pos); - - aux = zalloc(sizeof(*aux)); - if (aux == NULL) { - pr_debug("aux record is NULL\n"); - *err = -ENOMEM; - return NULL; - } + if (vpa_dtl_evsel) + return vpa_dtl_recording_init(vpa_dtl_evsel, err); - aux->recording_options = powerpc_vpadtl_recording_options; - aux->info_priv_size = powerpc_vpadtl_info_priv_size; - aux->info_fill = powerpc_vpadtl_info_fill; - aux->free = powerpc_vpadtl_free; - aux->reference = powerpc_vpadtl_reference; - return aux; + return NULL; } diff --git a/tools/perf/arch/powerpc/util/vpa-dtl.c b/tools/perf/arch/powerpc/util/vpa-dtl.c new file mode 100644 index 000000000000..fde388d87477 --- /dev/null +++ b/tools/perf/arch/powerpc/util/vpa-dtl.c @@ -0,0 +1,95 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * VPA DTL AUX tracing support + */ + +#include +#include +#include +#include +#include +#include +#include "../../util/cpumap.h" +#include "../../util/evsel.h" +#include "../../util/evlist.h" +#include "../../util/session.h" +#include "../../util/util.h" +#include "../../util/debug.h" +#include "../../util/auxtrace.h" +#include "../../util/powerpc-vpadtl.h" +#include "../../util/record.h" +#include // page_size + +#define KiB(x) ((x) * 1024) + +static int +powerpc_vpadtl_recording_options(struct auxtrace_record *ar __maybe_unused, + struct evlist *evlist __maybe_unused, + struct record_opts *opts) +{ + opts->full_auxtrace = true; + + /* + * Set auxtrace_mmap_pages to minimum + * two pages + */ + if (!opts->auxtrace_mmap_pages) { + opts->auxtrace_mmap_pages = KiB(128) / page_size; + if (opts->mmap_pages == UINT_MAX) + opts->mmap_pages = KiB(256) / page_size; + } + + return 0; +} + +static size_t powerpc_vpadtl_info_priv_size(struct auxtrace_record *itr __maybe_unused, + struct evlist *evlist __maybe_unused) +{ + return VPADTL_AUXTRACE_PRIV_SIZE; +} + +static int +powerpc_vpadtl_info_fill(struct auxtrace_record *itr __maybe_unused, + struct perf_session *session __maybe_unused, + struct perf_record_auxtrace_info *auxtrace_info, + size_t priv_size __maybe_unused) +{ + auxtrace_info->type = PERF_AUXTRACE_VPA_DTL; + + return 0; +} + +static void powerpc_vpadtl_free(struct auxtrace_record *itr) +{ + free(itr); +} + +static u64 powerpc_vpadtl_reference(struct auxtrace_record *itr __maybe_unused) +{ + return 0; +} + +struct auxtrace_record *vpa_dtl_recording_init(struct evsel *pos, int *err) +{ + struct auxtrace_record *aux; + + /* + * To obtain the auxtrace buffer file descriptor, the auxtrace event + * must come first. + */ + evlist__to_front(pos->evlist, pos); + + aux = zalloc(sizeof(*aux)); + if (aux == NULL) { + pr_debug("aux record allocation failed (-ENOMEM)\n"); + *err = -ENOMEM; + return NULL; + } + + aux->recording_options = powerpc_vpadtl_recording_options; + aux->info_priv_size = powerpc_vpadtl_info_priv_size; + aux->info_fill = powerpc_vpadtl_info_fill; + aux->free = powerpc_vpadtl_free; + aux->reference = powerpc_vpadtl_reference; + return aux; +} diff --git a/tools/perf/util/powerpc-vpadtl.h b/tools/perf/util/powerpc-vpadtl.h index ca809660b9bb..41e09b17a353 100644 --- a/tools/perf/util/powerpc-vpadtl.h +++ b/tools/perf/util/powerpc-vpadtl.h @@ -20,4 +20,5 @@ struct perf_pmu; int powerpc_vpadtl_process_auxtrace_info(union perf_event *event, struct perf_session *session); +struct auxtrace_record *vpa_dtl_recording_init(struct evsel *pos, int *err); #endif -- 2.43.0