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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-36140fe07c7sm10502749a91.5.2026.04.20.06.29.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Apr 2026 06:29:36 -0700 (PDT) Message-ID: <488faf07-3d22-49f5-af7c-cd27d9bc87ec@oss.qualcomm.com> Date: Mon, 20 Apr 2026 21:29:30 +0800 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 7/7] qcom-tgu: Add reset node to initialize To: Songwei Chai , 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: 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 References: <20260417073336.2712426-1-songwei.chai@oss.qualcomm.com> <20260417073336.2712426-8-songwei.chai@oss.qualcomm.com> Content-Language: en-US From: Jie Gan In-Reply-To: <20260417073336.2712426-8-songwei.chai@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: Ly63Rfl7p5uz2JuugNISv1_hwZOymxrC X-Authority-Analysis: v=2.4 cv=IMgyzAvG c=1 sm=1 tr=0 ts=69e62a42 cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=XEOHbNyQ1_GqabX02WAA:9 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-GUID: Ly63Rfl7p5uz2JuugNISv1_hwZOymxrC X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIwMDEzMSBTYWx0ZWRfX5Nq9A/KBzWeZ apZEIRXUHslZFHqj7CrLhwEDM9QmPhHYULJyzYtcxXTr9TlCx8eC0fduFSfK8hHU2iQpChHM4Wj QURdXJ8ocorXJM/W1r/igt412eRyLfbewLY6y7lJ5c0qzTUpllkPXiG6LyeEkwMRp6hOtGCWMW0 WLJXB3FfNmlF+otrIjRK7EYnp+akapTm59rwFLoJx74mCRyCT6+uN7UEvd1tvDd/kyMRsGzmeSq EUU3BJEkgfXP3kfKkxZafGhCwPLxip4oVWYoMR6HRWCLACRFfTpqSUcQQLVn1h/UphfsBxE94xi DSly0kpPq7ORdVfG9QBCMDmNLnjtSkpziZrXXwXPSmOJC95iM/8tZjz7YswUwzxihH/OR9M3uTH Bh6ALZOkpp3gwrwDthBT3rXhVd31ok+tZeZHkR0g8ays5utFAtC/xtzm62E10BeJH3U6dfofumJ 5EFvAKRKNB3jjwJt/uw== 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=2026-04-20_03,2026-04-17_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 clxscore=1015 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604200131 On 4/17/2026 3:33 PM, Songwei Chai wrote: > Add reset node to initialize the value of > priority/condition_decode/condition_select/timer/counter nodes. > LGTM. Reviewed-by: Jie Gan > 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, > }; >