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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34159a0780dsm3294791a91.16.2025.11.03.22.42.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 22:42:21 -0800 (PST) From: Songwei Chai To: andersson@kernel.org, alexander.shishkin@linux.intel.com, kernel@oss.qualcomm.com, mike.leach@linaro.org, suzuki.poulose@arm.com 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 Subject: [PATCH v7 7/7] qcom-tgu: Add reset node to initialize Date: Mon, 3 Nov 2025 22:40:43 -0800 Message-Id: <20251104064043.88972-8-songwei.chai@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251104064043.88972-1-songwei.chai@oss.qualcomm.com> References: <20251104064043.88972-1-songwei.chai@oss.qualcomm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=esbSD4pX c=1 sm=1 tr=0 ts=6909a04f cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=IgPCHI2mAnvcCQI4J_AA:9 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-GUID: scIwpX6TiwQLleUhucPZDGPCyGMjs5Jq X-Proofpoint-ORIG-GUID: scIwpX6TiwQLleUhucPZDGPCyGMjs5Jq X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA0MDA1MyBTYWx0ZWRfX3fE380fo5vwI GvSO1SvhVASxqM7aNYuIkFCaoKGWaIBt+6aiPxyzQmldB0qx/n7B5tYzrtAYgn1R3Ml2Tk9eqey 5g9imbblMKMewSWo66pzyhcdY2QNVRvOOOSg/zt5cIJJhgi5N4xLMQWqtGPxG4t8PPAgP9W7v6K 906mlJwVX3/41g9+OK/D2MrCL9dtKdLO83sIa0MvKj7Qqr87CuFv2t1mjF7ifRlmUNAmVKfzFuC 33GPDttyEbWHXnZgphaqSkrpIm/An6ulNJFAK62HXGl4IyjVQLLu7+4lS+mY5rgt+YCGz2Kijbh Yj9+MKxydfDxwY2QfCDVriaBFpQqI5wYlUmvwXRJmSedoCJ+Znz9pvfxKHOh2+nX/532XYBPjlO AQGbPttjfhCWFg+ijjoqEnlsr2H2cA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-03_06,2025-11-03_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 priorityscore=1501 adultscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511040053 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251103_224223_922931_3D0C43DC X-CRM114-Status: GOOD ( 18.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add reset node to initialize the value of priority/condition_decode/condition_select/timer/counter nodes. Signed-off-by: Songwei Chai --- .../testing/sysfs-bus-coresight-devices-tgu | 7 ++ drivers/hwtracing/qcom/tgu.c | 75 +++++++++++++++++++ 2 files changed, 82 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu index 11b4d34153ce..9d20b48fba3a 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tgu @@ -42,3 +42,10 @@ KernelVersion 6.18 Contact: Jinlong Mao , Songwei Chai Description: (RW) Set/Get the counter value with specific step for TGU. + +What: /sys/bus/coresight/devices//reset_tgu +Date: November 2025 +KernelVersion 6.18 +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 5db876c31a63..a164867c6b66 100644 --- a/drivers/hwtracing/qcom/tgu.c +++ b/drivers/hwtracing/qcom/tgu.c @@ -434,6 +434,80 @@ 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) +{ + unsigned long value; + struct tgu_drvdata *drvdata = dev_get_drvdata(dev->parent); + int i, j, ret; + + if (kstrtoul(buf, 0, &value) || value == 0) + return -EINVAL; + + if (!drvdata->enable) { + ret = pm_runtime_get_sync(drvdata->dev); + if (ret < 0) { + pm_runtime_put(drvdata->dev); + return ret; + } + } + + spin_lock(&drvdata->lock); + CS_UNLOCK(drvdata->base); + + writel(0, drvdata->base + TGU_CONTROL); + + if (drvdata->value_table->priority) + memset(drvdata->value_table->priority, 0, + MAX_PRIORITY * drvdata->max_step * + drvdata->max_reg * sizeof(unsigned int)); + + if (drvdata->value_table->condition_decode) + memset(drvdata->value_table->condition_decode, 0, + drvdata->max_condition_decode * drvdata->max_step * + sizeof(unsigned int)); + + /* Initialize all condition registers to NOT(value=0x1000000) */ + for (i = 0; i < drvdata->max_step; i++) { + for (j = 0; j < drvdata->max_condition_decode; j++) { + drvdata->value_table + ->condition_decode[calculate_array_location( + drvdata, i, TGU_CONDITION_DECODE, j)] = + 0x1000000; + } + } + + if (drvdata->value_table->condition_select) + memset(drvdata->value_table->condition_select, 0, + drvdata->max_condition_select * drvdata->max_step * + sizeof(unsigned int)); + + if (drvdata->value_table->timer) + memset(drvdata->value_table->timer, 0, + (drvdata->max_step) * + (drvdata->max_timer) * + sizeof(unsigned int)); + + if (drvdata->value_table->counter) + memset(drvdata->value_table->counter, 0, + (drvdata->max_step) * + (drvdata->max_counter) * + sizeof(unsigned int)); + + dev_dbg(dev, "Coresight-TGU reset complete\n"); + + CS_LOCK(drvdata->base); + + drvdata->enable = false; + spin_unlock(&drvdata->lock); + pm_runtime_put(drvdata->dev); + + return size; +} +static DEVICE_ATTR_WO(reset_tgu); + static const struct coresight_ops_helper tgu_helper_ops = { .enable = tgu_enable, .disable = tgu_disable, @@ -445,6 +519,7 @@ static const struct coresight_ops tgu_ops = { static struct attribute *tgu_common_attrs[] = { &dev_attr_enable_tgu.attr, + &dev_attr_reset_tgu.attr, NULL, }; -- 2.34.1