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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829a48ddd18sm892761b3a.56.2026.03.05.23.52.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2026 23:52:33 -0800 (PST) From: Jie Gan Date: Fri, 06 Mar 2026 15:52:04 +0800 Subject: [PATCH] coresight: tpdm: add traceid_show for checking traceid Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260306-add-traceid-show-for-tpdm-v1-1-0658a8edb972@oss.qualcomm.com> X-B4-Tracking: v=1; b=H4sIAKSHqmkC/x3MwQqDMAyA4VeRnA3EOjrYq4wdgknXHGYllSmI7 27x+B3+/4Cqblrh1R3g+rdqZW4Y+g6mzPNX0aQZAoVII0VkEVydJzXBmsuGqTiui/zw+aAwEHF iYWj94ppsv9/vz3leH7LAD2sAAAA= To: Suzuki K Poulose , Mike Leach , James Clark , Alexander Shishkin , Tingwei Zhang Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jie Gan X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1772783551; l=3535; i=jie.gan@oss.qualcomm.com; s=20250909; h=from:subject:message-id; bh=9CToOegMNE4EKR1Mvq634IgvqKvCeOVHmiKbGKVjJhQ=; b=GsEmbVoHqCW30NLzJ898S/W3Q/0ivtDfk6zg0+wXZOvLo89sLtb5+pAr0o84hGlYmDQrAKf4O HOmQ0k/DEHODuVFuBp2HQJzmdnehIhRcBcRsmTomN++59apNNW561XS X-Developer-Key: i=jie.gan@oss.qualcomm.com; a=ed25519; pk=3LxxUZRPCNkvPDlWOvXfJNqNO4SfGdy3eghMb8puHuk= X-Proofpoint-ORIG-GUID: fX3q4oKtHUu9XV5nJcCNhLQOpnBeDw9n X-Proofpoint-GUID: fX3q4oKtHUu9XV5nJcCNhLQOpnBeDw9n X-Authority-Analysis: v=2.4 cv=L+oQguT8 c=1 sm=1 tr=0 ts=69aa87c4 cx=c_pps a=Oh5Dbbf/trHjhBongsHeRQ==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=6dUr-SwRHgjYzu-3eYcA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=_Vgx9l1VpLgwpw_dHYaR:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA2MDA3MyBTYWx0ZWRfXwY7qGkcKlZIw SXa9pW9zV0480SRD2+Bs6LNUJgYf7zH2z2IQbDUNLrdVJiAsmSNsD+C29y58dgWlgNnCleJPOFe d6mEC6Yjrrah3PJz5J7jvjJc2wYiFKLl6J+3v8hh3pQhNhbxpIctkrN/Z5DISYlAX5DYY5Zn/8g LCwnsZKYpDSIngO437lk+SJ/i21rGLWbzIm4FrhyAqelK1ccbjHjJu5EOGyVI2h9LxXIMckkLUO u3aCkXlGWETe26AH6vOgXcXKxsdhgeLecaZPSD9Z/bidIlW69jjVHXmVNRk60vjqB0ecWXEsVgR AnKg47Wx/DSCpK77S4mNN4mo/dWpLifhd41EEZgipGtasZycC3NBR1wBpWC6hJKOvFVmP1oAVro q8RsF8+fDrRGvwkAV6GUr2+RPyP0eKqd/bb06HWcAtql+u4IvBmxllITGBTuG8XPHpFhnz6D4JV 9/vuoIovtD3CqNV2brg== 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=2026-03-06_02,2026-03-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 adultscore=0 bulkscore=0 priorityscore=1501 phishscore=0 impostorscore=0 lowpriorityscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603060073 Save the trace ID in drvdata during TPDM enablement and expose it to userspace to support trace data parsing. The TPDM device=E2=80=99s trace ID corresponds to the trace ID allocated to the connected TPDA device. Signed-off-by: Jie Gan --- drivers/hwtracing/coresight/coresight-tpdm.c | 31 ++++++++++++++++++++++++= +++- drivers/hwtracing/coresight/coresight-tpdm.h | 2 ++ 2 files changed, 32 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtraci= ng/coresight/coresight-tpdm.c index da77bdaad0a4..c0c9d2a7ac61 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -481,7 +481,7 @@ static void __tpdm_enable(struct tpdm_drvdata *drvdata) =20 static int tpdm_enable(struct coresight_device *csdev, struct perf_event *= event, enum cs_mode mode, - __maybe_unused struct coresight_path *path) + struct coresight_path *path) { struct tpdm_drvdata *drvdata =3D dev_get_drvdata(csdev->dev.parent); =20 @@ -497,6 +497,7 @@ static int tpdm_enable(struct coresight_device *csdev, = struct perf_event *event, } =20 __tpdm_enable(drvdata); + drvdata->traceid =3D path->trace_id; drvdata->enable =3D true; spin_unlock(&drvdata->spinlock); =20 @@ -693,6 +694,26 @@ static struct attribute_group tpdm_attr_grp =3D { .attrs =3D tpdm_attrs, }; =20 +static ssize_t traceid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long val; + struct tpdm_drvdata *drvdata =3D dev_get_drvdata(dev->parent); + + val =3D drvdata->traceid; + return sprintf(buf, "%#lx\n", val); +} +static DEVICE_ATTR_RO(traceid); + +static struct attribute *traceid_attrs[] =3D { + &dev_attr_traceid.attr, + NULL, +}; + +static struct attribute_group traceid_attr_grp =3D { + .attrs =3D traceid_attrs, +}; + static ssize_t dsb_mode_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -1367,6 +1388,12 @@ static const struct attribute_group *tpdm_attr_grps[= ] =3D { &tpdm_cmb_patt_grp, &tpdm_cmb_msr_grp, &tpdm_mcmb_attr_grp, + &traceid_attr_grp, + NULL, +}; + +static const struct attribute_group *static_tpdm_attr_grps[] =3D { + &traceid_attr_grp, NULL, }; =20 @@ -1425,6 +1452,8 @@ static int tpdm_probe(struct device *dev, struct reso= urce *res) desc.access =3D CSDEV_ACCESS_IOMEM(base); if (res) desc.groups =3D tpdm_attr_grps; + else + desc.groups =3D static_tpdm_attr_grps; drvdata->csdev =3D coresight_register(&desc); if (IS_ERR(drvdata->csdev)) return PTR_ERR(drvdata->csdev); diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtraci= ng/coresight/coresight-tpdm.h index 2867f3ab8186..befecbb896f4 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.h +++ b/drivers/hwtracing/coresight/coresight-tpdm.h @@ -300,6 +300,7 @@ struct cmb_dataset { * @cmb Specifics associated to TPDM CMB. * @dsb_msr_num Number of MSR supported by DSB TPDM * @cmb_msr_num Number of MSR supported by CMB TPDM + * @traceid trace ID of the path. */ =20 struct tpdm_drvdata { @@ -313,6 +314,7 @@ struct tpdm_drvdata { struct cmb_dataset *cmb; u32 dsb_msr_num; u32 cmb_msr_num; + u8 traceid; }; =20 /* Enumerate members of various datasets */ --- base-commit: 3f9cd19e764b782706dbaacc69e502099cb014ba change-id: 20260306-add-traceid-show-for-tpdm-7402100afada Best regards, --=20 Jie Gan