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[103.229.18.19]) by smtp.googlemail.com with ESMTPSA id d9443c01a7336-2e300b851b9sm5152715ad.78.2026.09.30.22.24.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 22:24:19 -0700 (PDT) From: Mayuresh Chitale To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Palmer Dabbelt , Paul Walmsley , Greg KH , Alexander Shishkin , Ian Rogers Cc: Anup Patel , 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 , Zane Leung Subject: [PATCH v6 07/14] gtrace: Add function to copy into perf AUX buffer Date: Thu, 1 Oct 2026 10:52:18 +0530 Message-ID: <20261001052243.3042627-8-mayuresh.chitale@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261001052243.3042627-1-mayuresh.chitale@oss.qualcomm.com> References: <20261001052243.3042627-1-mayuresh.chitale@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-Proofpoint-Spam-Info: AW1haW4tMjYxMDAxMDAyMSBTYWx0ZWRfX/WNI91bivVEy M7R7gmakqr0hT31XA2H/2fVqvOwL4mVPAN1rJIHLkEc0Mw2REHLAhPN4GxKKOWnVdwwSfVZxkQN GFf4xGjCJET8ryMKe2XMTX1fenmNtUw= X-Authority-Analysis: v=2.4 cv=OozaWC/t c=1 sm=1 tr=0 ts=6abdee85 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=TflMzYLVq8MTiglY7lUA:9 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-ORIG-GUID: LzEOUATUYWAzk47zEetETyMlbUTAVOwC X-Proofpoint-GUID: LzEOUATUYWAzk47zEetETyMlbUTAVOwC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDAxMDAyMSBTYWx0ZWRfX7L13galQNl4J aK8ZAeAKLHi/pmisGuWUFxXA2QEVVcYENJX4XQHeC3dyvLphVSq+M5xp9j3nFwryOaqPLM1ZmHS K/5hAVmrMQFZcidT7XeZ9SBkLkuuWuA5hQBAVGumbW3uNgMOtB77jc/F6sjjR6sOQwrj4SjAYoH +0SRCFmq63hfVIjtxYPupftpX1uf7+GxVk6Y0gR+s5CuNdc4kBwlJa06BwCEJgpIagm9C0nmRmZ gtmTh9WvUrvN+RjIkThWF8RZre4NUU0nIeazB5A84SJrs0dRNExMjbKeDzemWXjBmUcVgoNpUcZ rm/CmEpdggduebrGTuUtSojxzHFGVpSsBwLd0jwQk+SSq5/He4UVZaU8AxSlJ+/z5FN2OocCYBP Ca5Dt0KAP03xqjDCOxT4RaBbZ1+ejpXY3e97RgjzwGkKTB+bKwnOvE9Jpe3JlWqqzgHD78Kmo01 UuAH5lUNti+B9rbtjWg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-01_02,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 impostorscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 adultscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610010021 From: Anup Patel The RISC-V trace ramsink will need a mechanism to copy trace data into the perf AUX buffer. Add gtrace_path_copyto_auxbuf() function and corresponding trace driver callback copyto_auxbuf() for this purpose. Signed-off-by: Anup Patel Co-developed-by: Mayuresh Chitale Signed-off-by: Mayuresh Chitale --- drivers/hwtracing/gtrace/gtrace-core.c | 41 ++++++++++++++++++++++++++ include/linux/gtrace.h | 24 +++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/drivers/hwtracing/gtrace/gtrace-core.c b/drivers/hwtracing/gtrace/gtrace-core.c index d7f1df90aa31..acbeb3df2135 100644 --- a/drivers/hwtracing/gtrace/gtrace-core.c +++ b/drivers/hwtracing/gtrace/gtrace-core.c @@ -715,6 +715,47 @@ int gtrace_path_stop(struct gtrace_path *path) } EXPORT_SYMBOL_GPL(gtrace_path_stop); +int gtrace_path_copyto_auxbuf(struct gtrace_path *path, + struct gtrace_perf_auxbuf *buf, + size_t *bytes_copied, u64 *format) +{ + struct gtrace_comp_priv *sink = to_gtrace_comp_priv(gtrace_path_sink(path)); + const struct gtrace_driver *gtdrv; + struct gtrace_component *comp; + struct gtrace_path_node *node; + int ret = -EOPNOTSUPP; + unsigned long flags; + + /* + * Copy only after every path using the sink has stopped; otherwise the + * hardware may overwrite data being copied, or the same data may be copied + * to aux buffer twice. The last path to stop does the copy. Holding the + * sink's lock also stops another path from starting the sink before copy + * completes. + */ + raw_spin_lock_irqsave(&sink->lock, flags); + if (sink->start_count) { + *bytes_copied = 0; + ret = 0; + goto out; + } + + list_for_each_entry(node, &path->comp_list, head) { + comp = node->comp; + gtdrv = to_gtrace_driver(comp->dev.driver); + if (!gtdrv || !gtdrv->copyto_auxbuf) + continue; + + *bytes_copied = gtdrv->copyto_auxbuf(comp, buf, format); + ret = 0; + break; + } +out: + raw_spin_unlock_irqrestore(&sink->lock, flags); + return ret; +} +EXPORT_SYMBOL_GPL(gtrace_path_copyto_auxbuf); + struct gtrace_path *gtrace_create_path(struct gtrace_component *source, struct gtrace_component *sink, enum gtrace_component_mode mode) diff --git a/include/linux/gtrace.h b/include/linux/gtrace.h index a4b99c87d250..ed0e751faa91 100644 --- a/include/linux/gtrace.h +++ b/include/linux/gtrace.h @@ -266,9 +266,30 @@ void gtrace_destroy_path(struct gtrace_path *path); int gtrace_path_start(struct gtrace_path *path); int gtrace_path_stop(struct gtrace_path *path); +/** + * struct gtrace_perf_auxbuf - Representation of the perf AUX buffer. + * @length: Size of the AUX buffer. + * @nr_pages: Number of pages of the AUX buffer. + * @base: Start address of AUX buffer. + * @pos: Position in the AUX buffer to commit traced data. + */ +struct gtrace_perf_auxbuf { + size_t length; + int nr_pages; + void *base; + long pos; +}; + +int gtrace_path_copyto_auxbuf(struct gtrace_path *path, + struct gtrace_perf_auxbuf *buf, + size_t *bytes_copied, u64 *format); + /** * struct gtrace_driver - Representation of a trace driver. * @id_table: Table to match components handled by the driver. + * @copyto_auxbuf: Callback to copy data into perf AUX buffer. The driver + * reports the PMU specific trace format of the copied data + * via @format (see PERF_AUX_FLAG_PMU_FORMAT_TYPE_MASK). * @start: Callback to start tracing. * @stop: Callback to stop tracing. * @probe: Driver probe() function. @@ -279,6 +300,9 @@ int gtrace_path_stop(struct gtrace_path *path); */ struct gtrace_driver { const struct gtrace_component_id *id_table; + size_t (*copyto_auxbuf)(struct gtrace_component *comp, + struct gtrace_perf_auxbuf *buf, + u64 *format); int (*start)(struct gtrace_component *comp); int (*stop)(struct gtrace_component *comp); int (*probe)(struct gtrace_component *comp); -- 2.43.0