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[129.46.96.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2b1707d76aasm9459111eec.33.2026.01.08.18.12.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jan 2026 18:12:20 -0800 (PST) From: Songwei Chai To: andersson@kernel.org, alexander.shishkin@linux.intel.com, mike.leach@linaro.org, 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 v10 7/7] qcom-tgu: Add reset node to initialize Date: Thu, 8 Jan 2026 18:11:41 -0800 Message-Id: <20260109021141.3778421-8-songwei.chai@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260109021141.3778421-1-songwei.chai@oss.qualcomm.com> References: <20260109021141.3778421-1-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-Proofpoint-GUID: MzUS0XOc4aaiEf66C8xlS3kYBwOD5oYC X-Authority-Analysis: v=2.4 cv=X7Jf6WTe c=1 sm=1 tr=0 ts=69606406 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=IgPCHI2mAnvcCQI4J_AA:9 a=PxkB5W3o20Ba91AHUih5:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA5MDAxMiBTYWx0ZWRfX5q5hF+jGMjbD NWSDkEJds02DggQlP9qArbTNjihOOPZpK1qKMPXcZlMCfwzJTW9D3KxgdxzCODMU9xkUc5YdBlg hqZv2uDO0f77P962/gkGCJQd1IqzEUMzsS/Js6aXLXIsGELNsHvWyIYjFqZFXdOBEM2oBALE4jK 6rS49YF0W4LAKUXhjtsTkg05ZT8ZAieNPKvcZNRoSzWhoGJ12zq/StBt5B3XWw7fLr0B4XH2yGK Rsv3NXPZ/3XrMLCknQSANcfl5FNR26lEDOZEHvWY3P/quyqWEzUbJ46z2vZAty8e7SHSGH/pKDy WhXUbe7dqEqT9/1YwV+Fg49LFlVEYNdYm8SidAJZOd6wQIsBgg+8XM0nN7J2bNQML8kBhH9CvAO 6frpkEC4uij5tn51kH5jgK8/IHqH6wMygf6LpJDvC5wxRqMIPkSk3ZzH5JyUG7TRd1bxhzslIbb B4R1eOl6A0FLiNo4wYA== X-Proofpoint-ORIG-GUID: MzUS0XOc4aaiEf66C8xlS3kYBwOD5oYC 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=2026-01-09_01,2026-01-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 bulkscore=0 suspectscore=0 phishscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601090012 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 61b5a08bdee1..fa2618b31ab9 100644 --- a/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu +++ b/Documentation/ABI/testing/sysfs-bus-amba-devices-tgu @@ -42,3 +42,10 @@ KernelVersion 6.19 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: January 2026 +KernelVersion 6.19 +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 a3d9c3c4e28a..0a45ff78858b 100644 --- a/drivers/hwtracing/qcom/tgu.c +++ b/drivers/hwtracing/qcom/tgu.c @@ -424,8 +424,82 @@ 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); + unsigned long value; + int i, j, ret; + + if (kstrtoul(buf, 0, &value) || value =3D=3D 0) + return -EINVAL; + + if (!drvdata->enable) { + ret =3D pm_runtime_get_sync(drvdata->dev); + if (ret < 0) { + pm_runtime_put(drvdata->dev); + return ret; + } + } + + guard(spinlock)(&drvdata->lock); + TGU_UNLOCK(drvdata->base); + + writel(0, drvdata->base + TGU_CONTROL); + + TGU_LOCK(drvdata->base); + + 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=3D0x1000000) */ + for (i =3D 0; i < drvdata->max_step; i++) { + for (j =3D 0; j < drvdata->max_condition_decode; j++) { + drvdata->value_table + ->condition_decode[calculate_array_location( + drvdata, i, TGU_CONDITION_DECODE, j)] =3D + 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, "Qualcomm-TGU reset complete\n"); + + drvdata->enable =3D false; + 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