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Date: Fri, 2 Jun 2023 10:29:50 +0800
From: Tao Zhang <quic_taozha@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Konrad Dybcio <konradybcio@...il.com>,
Mike Leach <mike.leach@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC: Jinlong Mao <quic_jinlmao@...cinc.com>,
Leo Yan <leo.yan@...aro.org>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
<coresight@...ts.linaro.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>,
Hao Zhang <quic_hazha@...cinc.com>,
<linux-arm-msm@...r.kernel.org>, <andersson@...nel.org>
Subject: Re: [PATCH v4 05/11] coresight-tpdm: Add nodes to set trigger
timestamp and type
On 6/1/2023 5:05 PM, Suzuki K Poulose wrote:
> On 27/04/2023 10:00, Tao Zhang wrote:
>> The nodes are needed to set or show the trigger timestamp and
>> trigger type. This change is to add these nodes to achieve these
>> function.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>> ---
>> .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 24 ++++++
>> drivers/hwtracing/coresight/coresight-tpdm.c | 95
>> ++++++++++++++++++++++
>> 2 files changed, 119 insertions(+)
>>
>> diff --git
>> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> index 686bdde..77e67f2 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
>> @@ -21,3 +21,27 @@ Description:
>> Accepts only one value - 1.
>> 1 : Reset the dataset of the tpdm
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_type
>> +Date: March 2023
>> +KernelVersion 6.3
>
> This would need updating. We are not sure if this can make it to 6.5,
> with dependency on James' series. Fix this with 6.5 here and we can take
> a shot.
Sure, I will update this in the next patch series.
>
>> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang
>> (QUIC) <quic_taozha@...cinc.com>
>> +Description:
>> + (Write) Set the trigger type of DSB tpdm. Read the trigger
>> + type of DSB tpdm.
>> +
>> + Accepts only one of the 2 values - 0 or 1.
>> + 0 : Set the DSB trigger type to false
>> + 1 : Set the DSB trigger type to true
>> +
>> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_trig_ts
>> +Date: March 2023
>> +KernelVersion 6.3
>
> Same here
Sure, I will update this in the next patch series.
>> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@...cinc.com>, Tao Zhang
>> (QUIC) <quic_taozha@...cinc.com>
>> +Description:
>> + (Write) Set the trigger timestamp of DSB tpdm. Read the
>> + trigger timestamp of DSB tpdm.
>> +
>> + Accepts only one of the 2 values - 0 or 1.
>> + 0 : Set the DSB trigger type to false
>> + 1 : Set the DSB trigger type to true
>> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c
>> b/drivers/hwtracing/coresight/coresight-tpdm.c
>> index 2e64cfd..14f4352 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
>> @@ -20,6 +20,19 @@
>> DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
>> +static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
>> + struct attribute *attr, int n)
>
> minor nit: alignment ?
Sure, I will update this in the next patch series.
>
>> +{
>> + struct device *dev = kobj_to_dev(kobj);
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> + if (drvdata)
>> + if (drvdata && (drvdata->datasets & TPDM_PIDR0_DS_DSB))
>> + return attr->mode;
>
> Duplicate check for drvdata ?
>
> if (drvdata && (drvdata->datasets & TPDM_PIDR0_DS_DSB))
> return attr->mode;
Don't need double check here, I will change this in the next patch series.
Best,
Tao
>> +
>> + return 0;
>> +}
>> +
>> static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
>> {
>> if (drvdata->datasets & TPDM_PIDR0_DS_DSB) {
>> @@ -239,8 +252,90 @@ static struct attribute_group tpdm_attr_grp = {
>> .attrs = tpdm_attrs,
>> };
>> +static ssize_t dsb_trig_type_show(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> + return sysfs_emit(buf, "%u\n",
>> + (unsigned int)drvdata->dsb->trig_type);
>> +}
>> +
>> +/*
>> + * Trigger type (boolean):
>> + * false - Disable trigger type.
>> + * true - Enable trigger type.
>> + */
>> +static ssize_t dsb_trig_type_store(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf,
>> + size_t size)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> + unsigned long val;
>> +
>> + if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
>> + return -EINVAL;
>> +
>> + spin_lock(&drvdata->spinlock);
>> + if (val)
>> + drvdata->dsb->trig_type = true;
>> + else
>> + drvdata->dsb->trig_type = false;
>> + spin_unlock(&drvdata->spinlock);
>> + return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_trig_type);
>> +
>> +static ssize_t dsb_trig_ts_show(struct device *dev,
>> + struct device_attribute *attr, char *buf)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> +
>> + return sysfs_emit(buf, "%u\n",
>> + (unsigned int)drvdata->dsb->trig_ts);
>> +}
>> +
>> +/*
>> + * Trigger timestamp (boolean):
>> + * false - Disable trigger timestamp.
>> + * true - Enable trigger timestamp.
>> + */
>> +static ssize_t dsb_trig_ts_store(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf,
>> + size_t size)
>> +{
>> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
>> + unsigned long val;
>> +
>> + if ((kstrtoul(buf, 0, &val)) || (val & ~1UL))
>> + return -EINVAL;
>> +
>> + spin_lock(&drvdata->spinlock);
>> + if (val)
>> + drvdata->dsb->trig_ts = true;
>> + else
>> + drvdata->dsb->trig_ts = false;
>> + spin_unlock(&drvdata->spinlock);
>> + return size;
>> +}
>> +static DEVICE_ATTR_RW(dsb_trig_ts);
>> +
>> +static struct attribute *tpdm_dsb_attrs[] = {
>> + &dev_attr_dsb_trig_ts.attr,
>> + &dev_attr_dsb_trig_type.attr,
>> + NULL,
>> +};
>> +
>> +static struct attribute_group tpdm_dsb_attr_grp = {
>> + .attrs = tpdm_dsb_attrs,
>> + .is_visible = tpdm_dsb_is_visible,
>> +};
>> +
>> static const struct attribute_group *tpdm_attr_grps[] = {
>> &tpdm_attr_grp,
>> + &tpdm_dsb_attr_grp,
>> NULL,
>> };
>
> Rest looks fine to me
>
> Suzuki
>
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