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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2cafd073194sm951094eec.28.2026.04.02.02.29.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 02:29:04 -0700 (PDT) From: Songwei Chai To: andersson@kernel.org, alexander.shishkin@linux.intel.com, mike.leach@linaro.org, konrad.dybcio@oss.qualcomm.com, suzuki.poulose@arm.com, james.clark@arm.com, krzk+dt@kernel.org, conor+dt@kernel.org Cc: Songwei Chai , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org, devicetree@vger.kernel.org, gregkh@linuxfoundation.org Subject: [PATCH v13 7/7] qcom-tgu: Add reset node to initialize Date: Thu, 2 Apr 2026 02:28:38 -0700 Message-Id: <20260402092838.341295-8-songwei.chai@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260402092838.341295-1-songwei.chai@oss.qualcomm.com> References: <20260402092838.341295-1-songwei.chai@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Authority-Analysis: v=2.4 cv=RYydyltv c=1 sm=1 tr=0 ts=69ce36e2 cx=c_pps a=wEP8DlPgTf/vqF+yE6f9lg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=IgPCHI2mAnvcCQI4J_AA:9 a=bBxd6f-gb0O0v-kibOvt:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDA4NCBTYWx0ZWRfX5PBXrX90haQ9 a5ezXD+q7+RWhbhV9sYcTntFw37I6kGEwhfSHiM55KFkYzgoicId9UdSDce9qx/opyDyhmBxCFM 4AjG9gP/JQfpvoRZ+/ajXgDWxmBVuHKYfT4MO1+bjRNYUVmpA0ufd0GefHUTVgTQDd2Q+I5hy/G z8+cyF9PW1JnJNNiZH20SwP7vLkcn6P0jvjsYkqOtXhXyzd/g1Zop5gyAMfC0ufPI7eQb7JIbjp 93APcF9MWq1MsDHyTC5RK8dqmh0ZLWQMkEExy3mB03zfEniATXddIJymALkLtDWcQDinl5lZZUD ejhNOroe8PcIy3zkOJmWC/KXNl4Nbr3ZwZ9N5S3aekQ+qgGIcLsNq5ZnwkqSChp0yiedmMEA36s eD81OwmpnpXycNHzNiC9fXjpPc33D2SZ1e+G3mlHhZ2FfrlkmTKzC/eePVK07tSylzi8Tuo3oLV fvmC4aohyUxc0LoioQg== X-Proofpoint-ORIG-GUID: PneKmKlsAC7IA9w-I1dG1R4X-n7w2QM5 X-Proofpoint-GUID: PneKmKlsAC7IA9w-I1dG1R4X-n7w2QM5 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=2026-04-02_01,2026-04-02_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 clxscore=1015 adultscore=0 bulkscore=0 spamscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020084 Content-Type: text/plain; charset="utf-8" Add reset node to initialize the value of priority/condition_decode/condition_select/timer/counter nodes. Signed-off-by: Songwei Chai --- .../ABI/testing/sysfs-bus-amba-devices-tgu | 7 ++ drivers/hwtracing/qcom/tgu.c | 74 +++++++++++++++++++ 2 files changed, 81 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu b/Documen= tation/ABI/testing/sysfs-bus-amba-devices-tgu index 7a3573e03e27..a6b6019c8ef1 100644 --- a/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu +++ b/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu @@ -42,3 +42,10 @@ KernelVersion: 7.1 Contact: Jinlong Mao , Songwei Chai Description: (RW) Set/Get the counter value with specific step for TGU. + +What: /sys/bus/amba/devices//reset_tgu +Date: April 2026 +KernelVersion: 7.1 +Contact: Jinlong Mao , Songwei Chai +Description: + (Write) Write 1 to reset the dataset for TGU. diff --git a/drivers/hwtracing/qcom/tgu.c b/drivers/hwtracing/qcom/tgu.c index 4a529520b428..752fcd2963e1 100644 --- a/drivers/hwtracing/qcom/tgu.c +++ b/drivers/hwtracing/qcom/tgu.c @@ -420,8 +420,82 @@ static ssize_t enable_tgu_store(struct device *dev, } static DEVICE_ATTR_RW(enable_tgu); =20 +/* reset_tgu_store - Reset Trace and Gating Unit (TGU) configuration. */ +static ssize_t reset_tgu_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t size) +{ + struct tgu_drvdata *drvdata =3D dev_get_drvdata(dev); + struct value_table *vt =3D drvdata->value_table; + u32 *cond_decode =3D drvdata->value_table->condition_decode; + unsigned long value; + int i, j, ret; + + if (kstrtoul(buf, 0, &value) || value !=3D 1) + return -EINVAL; + + spin_lock(&drvdata->lock); + if (!drvdata->enabled) { + spin_unlock(&drvdata->lock); + ret =3D pm_runtime_resume_and_get(drvdata->dev); + if (ret) + return ret; + spin_lock(&drvdata->lock); + } + + tgu_do_disable(drvdata); + + if (vt->priority) { + size_t size =3D MAX_PRIORITY * drvdata->num_step * + drvdata->num_reg * sizeof(unsigned int); + memset(vt->priority, 0, size); + } + + if (vt->condition_decode) { + size_t size =3D drvdata->num_condition_decode * + drvdata->num_step * sizeof(unsigned int); + memset(vt->condition_decode, 0, size); + } + + /* Initialize all condition registers to NOT(value=3D0x1000000) */ + for (i =3D 0; i < drvdata->num_step; i++) { + for (j =3D 0; j < drvdata->num_condition_decode; j++) { + cond_decode[calculate_array_location(drvdata, i, + TGU_CONDITION_DECODE, j)] =3D 0x1000000; + } + } + + if (vt->condition_select) { + size_t size =3D drvdata->num_condition_select * + drvdata->num_step * sizeof(unsigned int); + memset(vt->condition_select, 0, size); + } + + if (vt->timer) { + size_t size =3D (drvdata->num_step) * (drvdata->num_timer) * + sizeof(unsigned int); + memset(vt->timer, 0, size); + } + + if (vt->counter) { + size_t size =3D (drvdata->num_step) * (drvdata->num_counter) * + sizeof(unsigned int); + memset(vt->counter, 0, size); + } + + spin_unlock(&drvdata->lock); + + dev_dbg(dev, "Qualcomm-TGU reset complete\n"); + + pm_runtime_put(drvdata->dev); + + return size; +} +static DEVICE_ATTR_WO(reset_tgu); + static struct attribute *tgu_common_attrs[] =3D { &dev_attr_enable_tgu.attr, + &dev_attr_reset_tgu.attr, NULL, }; =20 --=20 2.34.1