Messages in this thread | | | Date | Thu, 25 May 2023 16:36:14 +0800 | Subject | Re: [PATCH v4 04/11] coresight-tpdm: Add reset node to TPDM node | From | Tao Zhang <> |
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On 5/23/2023 10:53 PM, Suzuki K Poulose wrote: > On 27/04/2023 10:00, Tao Zhang wrote: >> TPDM device need a node to reset the configurations and status of >> it. This change provides a node to reset the configurations and >> disable the TPDM if it has been enabled. >> >> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com> >> --- >> .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 10 ++++++++ >> drivers/hwtracing/coresight/coresight-tpdm.c | 27 >> ++++++++++++++++++++++ >> 2 files changed, 37 insertions(+) >> >> diff --git >> a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm >> b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm >> index 4a58e64..686bdde 100644 >> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm >> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm >> @@ -11,3 +11,13 @@ Description: >> Accepts only one of the 2 values - 1 or 2. >> 1 : Generate 64 bits data >> 2 : Generate 32 bits data >> + >> +What: /sys/bus/coresight/devices/<tpdm-name>/reset >> +Date: March 2023 >> +KernelVersion 6.3 >> +Contact: Jinlong Mao (QUIC) <quic_jinlmao@quicinc.com>, Tao Zhang >> (QUIC) <quic_taozha@quicinc.com> >> +Description: >> + (Write) Reset the dataset of the tpdm, and disable the tpdm. >> + >> + Accepts only one value - 1. >> + 1 : Reset the dataset of the tpdm >> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c >> b/drivers/hwtracing/coresight/coresight-tpdm.c >> index 6f8a8ab..2e64cfd 100644 >> --- a/drivers/hwtracing/coresight/coresight-tpdm.c >> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c >> @@ -164,6 +164,32 @@ static int tpdm_datasets_setup(struct >> tpdm_drvdata *drvdata) >> return 0; >> } >> +static ssize_t reset_store(struct device *dev, >> + struct device_attribute *attr, >> + const char *buf, >> + size_t size) >> +{ >> + int ret = 0; >> + unsigned long val; >> + struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent); >> + >> + ret = kstrtoul(buf, 10, &val); >> + if (ret || val != 1) >> + return -EINVAL; >> + >> + spin_lock(&drvdata->spinlock); >> + tpdm_reset_datasets(drvdata); >> + >> + spin_unlock(&drvdata->spinlock); >> + >> + /* Disable tpdm if enabled */ >> + if (drvdata->enable) >> + coresight_disable_source(drvdata->csdev, NULL); > > I am not really keen on doing this behind the back. What about the > path of components ? We could simply reject the request when the TPDA > is enabled and let the user alway follow : > 1) Disable the TPDM manually via sysfs > 2) Reset the TPDM. > > So, please remove the disable step here.
I will update this in the next patch series.
Best,
Tao
> > Suzuki > > >> + >> + return size; >> +} >> +static DEVICE_ATTR_WO(reset); >> + >> /* >> * value 1: 64 bits test data >> * value 2: 32 bits test data >> @@ -204,6 +230,7 @@ static ssize_t integration_test_store(struct >> device *dev, >> static DEVICE_ATTR_WO(integration_test); >> static struct attribute *tpdm_attrs[] = { >> + &dev_attr_reset.attr, >> &dev_attr_integration_test.attr, >> NULL, >> }; >
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