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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2e53ccd2564sm1135168eec.18.2026.04.17.00.34.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Apr 2026 00:34:09 -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 v14 7/7] qcom-tgu: Add reset node to initialize Date: Fri, 17 Apr 2026 00:33:36 -0700 Message-Id: <20260417073336.2712426-8-songwei.chai@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260417073336.2712426-1-songwei.chai@oss.qualcomm.com> References: <20260417073336.2712426-1-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: 8bit X-Proofpoint-ORIG-GUID: ZnJIXdaQT_OaXZJRGPkkUjmv84YlFLwO X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE3MDA3NSBTYWx0ZWRfX3Hbzcbm/Dhdx aq9tsLePfyBLPjuIKAwymY6US48DgDMQfwDrQ7tUHt8gPzjILqO7muSAzN0I5S2YJQ79Zir04IE SY8l1bTcyZulwXTkHNGRR5PPNVxkr9I3xXCkwzt3UPrQtKxQzWyMmOUp4pugPvTSftVUqW6hXXf 9NldOE2Lt/EHLcgGypQOPAlY7hMlSnXEpZDT5jNmG0mycD5fHLnk2bbg5t2yNKMbii77d4cGN9Z rfxRrbVE+OfscXmPVuYANWA4nlp8dpM9iD9ilotE0wJUcTSNLU1OHS0G3G84QL95bp5Stcytcu2 iqtSZSFxdot6t+7NFyE4PiexQh6+Vkj4omCDUhVINp6clpmcCbW7hgbZtdGS+fN8/V8nX+1PRjQ r7HnZNYcy1qm69IJDaoCsNWtniLiS3nPNmA2moNoqBsJSFL2ywjzYVgw0wXWAYiFRX/FWUFCjU8 ib+7e/PrkBwYJHMgr5w== X-Authority-Analysis: v=2.4 cv=b4mCJNGx c=1 sm=1 tr=0 ts=69e1e2b1 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=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=IgPCHI2mAnvcCQI4J_AA:9 a=bBxd6f-gb0O0v-kibOvt:22 X-Proofpoint-GUID: ZnJIXdaQT_OaXZJRGPkkUjmv84YlFLwO 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=2026-04-16_04,2026-04-16_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 adultscore=0 bulkscore=0 phishscore=0 clxscore=1015 spamscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604170075 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/Documentation/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 6d5bf2621cb0..9fb51f2a912f 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); +/* 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 = dev_get_drvdata(dev); + struct value_table *vt = drvdata->value_table; + u32 *cond_decode = drvdata->value_table->condition_decode; + unsigned long value; + int i, j, ret; + + if (kstrtoul(buf, 0, &value) || value != 1) + return -EINVAL; + + spin_lock(&drvdata->lock); + if (!drvdata->enabled) { + spin_unlock(&drvdata->lock); + ret = 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 = MAX_PRIORITY * drvdata->num_step * + drvdata->num_reg * sizeof(unsigned int); + memset(vt->priority, 0, size); + } + + if (vt->condition_decode) { + size_t size = drvdata->num_condition_decode * + drvdata->num_step * sizeof(unsigned int); + memset(vt->condition_decode, 0, size); + } + + /* Initialize all condition registers to NOT(value=0x1000000) */ + for (i = 0; i < drvdata->num_step; i++) { + for (j = 0; j < drvdata->num_condition_decode; j++) { + cond_decode[calculate_array_location(drvdata, i, + TGU_CONDITION_DECODE, j)] = 0x1000000; + } + } + + if (vt->condition_select) { + size_t size = drvdata->num_condition_select * + drvdata->num_step * sizeof(unsigned int); + memset(vt->condition_select, 0, size); + } + + if (vt->timer) { + size_t size = (drvdata->num_step) * (drvdata->num_timer) * + sizeof(unsigned int); + memset(vt->timer, 0, size); + } + + if (vt->counter) { + size_t size = (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[] = { &dev_attr_enable_tgu.attr, + &dev_attr_reset_tgu.attr, NULL, }; -- 2.34.1