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Wed, 29 Apr 2026 12:51:41 +0000 (GMT) Received: from pps.filterd (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (8.18.1.7/8.18.1.7) with ESMTP id 63TCpbKE010775; Wed, 29 Apr 2026 12:51:37 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTPS id 4ds65fvr0s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 29 Apr 2026 12:51:37 +0000 (GMT) Received: from APBLRPPMTA02.qualcomm.com (APBLRPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.1.12) with ESMTP id 63TCpbun010749; Wed, 29 Apr 2026 12:51:37 GMT Received: from hu-devc-blr-u24-a.qualcomm.com (hu-anuppate-blr.qualcomm.com [10.131.36.165]) by APBLRPPMTA02.qualcomm.com (PPS) with ESMTPS id 63TCpbBr010746 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 29 Apr 2026 12:51:37 +0000 (GMT) Received: by hu-devc-blr-u24-a.qualcomm.com (Postfix, from userid 486687) id BC33521D1B; Wed, 29 Apr 2026 18:21:36 +0530 (+0530) From: Anup Patel To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Palmer Dabbelt , Paul Walmsley , Greg KH , Alexander Shishkin , Ian Rogers Cc: Alexandre Ghiti , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Mark Rutland , Jiri Olsa , Adrian Hunter , Mayuresh Chitale , Anup Patel , Atish Patra , Andrew Jones , Sunil V L , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Mayuresh Chitale , Anup Patel Subject: [PATCH v4 04/12] rvtrace: Add functions to start/stop tracing on a component path Date: Wed, 29 Apr 2026 18:21:27 +0530 Message-ID: <20260429125135.1983498-5-anup.patel@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260429125135.1983498-1-anup.patel@oss.qualcomm.com> References: <20260429125135.1983498-1-anup.patel@oss.qualcomm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-GUID: _VkAvuobiMqMgK3w947Xs9pTn9Ir3apj X-Authority-Analysis: v=2.4 cv=KcHidwYD c=1 sm=1 tr=0 ts=69f1fedd cx=c_pps a=Ou0eQOY4+eZoSc0qltEV5Q==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=a8cUU4qgmBzOD3ajWOcA:9 X-Proofpoint-ORIG-GUID: _VkAvuobiMqMgK3w947Xs9pTn9Ir3apj X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI5MDEzMCBTYWx0ZWRfX2ZHDR7eHayy4 TvUlQbpwm01TAJHPVGyubLqrkIx0qzmhZ10vXCtLw2SrArJaZHdsIfRgIO76WRTE1UR6ofG6cEQ zkqoyu/3xC3aPVMGoQ4cHRZAMxJ5Hk/SEbw64eNVEInqVfu1QGUcXp+SzIg9p6MUsKciyndUwbc EovXoijuCeElHIqftd9sj12G4sONAwfIYi+Y9+PMvgYT+3KIm1h+ZUZ2yKx2+EB6LGo2vy+9VI2 aCI9mtq9sp5ZU8F7ck/QwvzjmkopkBaO4AuJbwJI8eLZ836dwg+XTZLKxGhk5CwLJWKuHAf6l3e /Xh65u0IJpwOQyhSJj/urT7vu2q2dxKv9PvUpVrbHsr/BUNX/XdyUNFvwzTdNxp6TFtZpzcC1vB 9b/d1Z79o9udasIvWC+MbnMo0SMlB7kmbAdtRUlFgZUJh5bDCF17zaSA//r2sH2F0z575SCF2TI up5VFuCXbCSwlfkUt4w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-28_05,2026-04-28_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 spamscore=0 phishscore=0 bulkscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604290130 From: Mayuresh Chitale The perf driver framework needs to be able to start / stop all components in a trace component path during its operation. Add rvtrace_path_start() and rvtrace_path_stop() functions for this purpose. Co-developed-by: Anup Patel Signed-off-by: Anup Patel Signed-off-by: Mayuresh Chitale --- drivers/hwtracing/rvtrace/rvtrace-core.c | 44 ++++++++++++++++++++++++ include/linux/rvtrace.h | 6 ++++ 2 files changed, 50 insertions(+) diff --git a/drivers/hwtracing/rvtrace/rvtrace-core.c b/drivers/hwtracing/rvtrace/rvtrace-core.c index f78e3ba9a0e5..733d07abffbc 100644 --- a/drivers/hwtracing/rvtrace/rvtrace-core.c +++ b/drivers/hwtracing/rvtrace/rvtrace-core.c @@ -620,6 +620,50 @@ static void rvtrace_release_path_nodes(struct rvtrace_path *path) } } +int rvtrace_path_start(struct rvtrace_path *path) +{ + const struct rvtrace_driver *rtdrv; + struct rvtrace_component *comp; + struct rvtrace_path_node *node; + int ret; + + list_for_each_entry_reverse(node, &path->comp_list, head) { + comp = node->comp; + rtdrv = to_rvtrace_driver(comp->dev.driver); + if (!rtdrv->start) + continue; + + ret = rtdrv->start(comp); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(rvtrace_path_start); + +int rvtrace_path_stop(struct rvtrace_path *path) +{ + const struct rvtrace_driver *rtdrv; + struct rvtrace_component *comp; + struct rvtrace_path_node *node; + int ret; + + list_for_each_entry(node, &path->comp_list, head) { + comp = node->comp; + rtdrv = to_rvtrace_driver(comp->dev.driver); + if (!rtdrv->stop) + continue; + + ret = rtdrv->stop(comp); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(rvtrace_path_stop); + struct rvtrace_path *rvtrace_create_path(struct rvtrace_component *source, struct rvtrace_component *sink, enum rvtrace_component_mode mode) diff --git a/include/linux/rvtrace.h b/include/linux/rvtrace.h index 00b63fa22da9..2a7d8afd27c8 100644 --- a/include/linux/rvtrace.h +++ b/include/linux/rvtrace.h @@ -277,10 +277,14 @@ struct rvtrace_path *rvtrace_create_path(struct rvtrace_component *source, struct rvtrace_component *sink, enum rvtrace_component_mode mode); void rvtrace_destroy_path(struct rvtrace_path *path); +int rvtrace_path_start(struct rvtrace_path *path); +int rvtrace_path_stop(struct rvtrace_path *path); /** * struct rvtrace_driver - Representation of a RISC-V trace driver * id_table: Table to match components handled by the driver + * start: Callback to start tracing + * stop: Callback to stop tracing * probe: Driver probe() function * remove: Driver remove() function * get_trace_id: Get/allocate a trace ID @@ -289,6 +293,8 @@ void rvtrace_destroy_path(struct rvtrace_path *path); */ struct rvtrace_driver { const struct rvtrace_component_id *id_table; + int (*start)(struct rvtrace_component *comp); + int (*stop)(struct rvtrace_component *comp); int (*probe)(struct rvtrace_component *comp); void (*remove)(struct rvtrace_component *comp); int (*get_trace_id)(struct rvtrace_component *comp, -- 2.43.0