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Message-ID: <06bed294-0d48-412b-a844-42d7fea6e4b1@quicinc.com>
Date: Fri, 21 Feb 2025 09:23:47 +0800
From: Jie Gan <quic_jiegan@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach
<mike.leach@...aro.org>,
James Clark <james.clark@...aro.org>,
"Alexander
Shishkin" <alexander.shishkin@...ux.intel.com>,
Maxime Coquelin
<mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>
CC: Tingwei Zhang <quic_tingweiz@...cinc.com>,
Jinlong Mao
<quic_jinlmao@...cinc.com>, <coresight@...ts.linaro.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH v12 2/7] Coresight: Add trace_id function to retrieving
the trace ID
On 2/21/2025 1:34 AM, Suzuki K Poulose wrote:
> On 17/02/2025 09:30, Jie Gan wrote:
>> Add 'trace_id' function pointer in ops. It's responsible for
>> retrieving the device's trace ID.
>>
>> Co-developed-by: James Clark <james.clark@...aro.org>
>> Signed-off-by: James Clark <james.clark@...aro.org>
>> Reviewed-by: James Clark <james.clark@...aro.org>
>> Signed-off-by: Jie Gan <quic_jiegan@...cinc.com>
>
>
> minor nit: Given this is an optional callback, we could as well make
> this a generic ops and avoid checking if it is a link/source etc. We
> anyway check if the op is available before calling it.
>
> i.e.:
>
> struct coresight_ops {
> + int (*trace_id)(struct coresight *csdev,...);
>
> ...
> };
>
Hi Suzuki,
Thanks for comment. Looks a good idea because the trace_id is a generic
function for the coresight_deivce, which can simplify our codes.
Will update a new version to acheive the idea.
Thanks,
Jie
>
>
>
>> ---
>> drivers/hwtracing/coresight/coresight-core.c | 27 +++++++++++++++++++
>> drivers/hwtracing/coresight/coresight-dummy.c | 11 ++++++++
>> .../coresight/coresight-etm3x-core.c | 1 +
>> .../coresight/coresight-etm4x-core.c | 1 +
>> drivers/hwtracing/coresight/coresight-stm.c | 11 ++++++++
>> drivers/hwtracing/coresight/coresight-tpda.c | 11 ++++++++
>> include/linux/coresight.h | 8 ++++++
>> 7 files changed, 70 insertions(+)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/
>> hwtracing/coresight/coresight-core.c
>> index 0a9380350fb5..6cad777757f3 100644
>> --- a/drivers/hwtracing/coresight/coresight-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-core.c
>> @@ -23,6 +23,7 @@
>> #include "coresight-etm-perf.h"
>> #include "coresight-priv.h"
>> #include "coresight-syscfg.h"
>> +#include "coresight-trace-id.h"
>> /*
>> * Mutex used to lock all sysfs enable and disable actions and
>> loading and
>> @@ -1515,6 +1516,32 @@ void coresight_remove_driver(struct amba_driver
>> *amba_drv,
>> }
>> EXPORT_SYMBOL_GPL(coresight_remove_driver);
>> +int coresight_etm_get_trace_id(struct coresight_device *csdev, enum
>> cs_mode mode,
>> + struct coresight_device *sink)
>> +{
>> + int trace_id;
>> + int cpu = source_ops(csdev)->cpu_id(csdev);
>> +
>> + switch (mode) {
>> + case CS_MODE_SYSFS:
>> + trace_id = coresight_trace_id_get_cpu_id(cpu);
>> + break;
>> + case CS_MODE_PERF:
>> + trace_id = coresight_trace_id_get_cpu_id_map(cpu, &sink-
>> >perf_sink_id_map);
>> + break;
>> + default:
>> + trace_id = -EINVAL;
>> + break;
>> + }
>> +
>> + if (!IS_VALID_CS_TRACE_ID(trace_id))
>> + dev_err(&csdev->dev,
>> + "Failed to allocate trace ID on CPU%d\n", cpu);
>> +
>> + return trace_id;
>> +}
>> +EXPORT_SYMBOL_GPL(coresight_etm_get_trace_id);
>> +
>> MODULE_LICENSE("GPL v2");
>> MODULE_AUTHOR("Pratik Patel <pratikp@...eaurora.org>");
>> MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@...aro.org>");
>> diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/
>> hwtracing/coresight/coresight-dummy.c
>> index 9be53be8964b..c47f0382b943 100644
>> --- a/drivers/hwtracing/coresight/coresight-dummy.c
>> +++ b/drivers/hwtracing/coresight/coresight-dummy.c
>> @@ -41,6 +41,16 @@ static void dummy_source_disable(struct
>> coresight_device *csdev,
>> dev_dbg(csdev->dev.parent, "Dummy source disabled\n");
>> }
>> +static int dummy_source_trace_id(struct coresight_device *csdev,
>> __maybe_unused enum cs_mode mode,
>> + __maybe_unused struct coresight_device *sink)
>> +{
>> + struct dummy_drvdata *drvdata;
>> +
>> + drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> + return drvdata->traceid;
>> +}
>> +
>> static int dummy_sink_enable(struct coresight_device *csdev, enum
>> cs_mode mode,
>> void *data)
>> {
>> @@ -59,6 +69,7 @@ static int dummy_sink_disable(struct
>> coresight_device *csdev)
>> static const struct coresight_ops_source dummy_source_ops = {
>> .enable = dummy_source_enable,
>> .disable = dummy_source_disable,
>> + .trace_id = dummy_source_trace_id,
>> };
>> static const struct coresight_ops dummy_source_cs_ops = {
>> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/
>> drivers/hwtracing/coresight/coresight-etm3x-core.c
>> index c103f4c70f5d..a38e72ef8e79 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
>> @@ -701,6 +701,7 @@ static const struct coresight_ops_source
>> etm_source_ops = {
>> .cpu_id = etm_cpu_id,
>> .enable = etm_enable,
>> .disable = etm_disable,
>> + .trace_id = coresight_etm_get_trace_id,
>> };
>> static const struct coresight_ops etm_cs_ops = {
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/
>> drivers/hwtracing/coresight/coresight-etm4x-core.c
>> index 2c1a60577728..1a993d5380e7 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> @@ -1064,6 +1064,7 @@ static const struct coresight_ops_source
>> etm4_source_ops = {
>> .cpu_id = etm4_cpu_id,
>> .enable = etm4_enable,
>> .disable = etm4_disable,
>> + .trace_id = coresight_etm_get_trace_id,
>> };
>> static const struct coresight_ops etm4_cs_ops = {
>> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/
>> hwtracing/coresight/coresight-stm.c
>> index b581a30a1cd9..64fcfa916562 100644
>> --- a/drivers/hwtracing/coresight/coresight-stm.c
>> +++ b/drivers/hwtracing/coresight/coresight-stm.c
>> @@ -281,9 +281,20 @@ static void stm_disable(struct coresight_device
>> *csdev,
>> }
>> }
>> +static int stm_trace_id(struct coresight_device *csdev,
>> __maybe_unused enum cs_mode mode,
>> + __maybe_unused struct coresight_device *sink)
>> +{
>> + struct stm_drvdata *drvdata;
>> +
>> + drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> + return drvdata->traceid;
>> +}
>> +
>> static const struct coresight_ops_source stm_source_ops = {
>> .enable = stm_enable,
>> .disable = stm_disable,
>> + .trace_id = stm_trace_id,
>> };
>> static const struct coresight_ops stm_cs_ops = {
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/
>> hwtracing/coresight/coresight-tpda.c
>> index 189a4abc2561..d80b6427e5a6 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -241,9 +241,20 @@ static void tpda_disable(struct coresight_device
>> *csdev,
>> dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", in->dest_port);
>> }
>> +static int tpda_trace_id(struct coresight_device *csdev,
>> __maybe_unused enum cs_mode mode,
>> + __maybe_unused struct coresight_device *sink)
>> +{
>> + struct tpda_drvdata *drvdata;
>> +
>> + drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> + return drvdata->atid;
>> +}
>> +
>> static const struct coresight_ops_link tpda_link_ops = {
>> .enable = tpda_enable,
>> .disable = tpda_disable,
>> + .trace_id = tpda_trace_id,
>> };
>> static const struct coresight_ops tpda_cs_ops = {
>> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
>> index 157c4bd009a1..70407d61262e 100644
>> --- a/include/linux/coresight.h
>> +++ b/include/linux/coresight.h
>> @@ -368,6 +368,7 @@ struct coresight_ops_sink {
>> * Operations available for links.
>> * @enable: enables flow between iport and oport.
>> * @disable: disables flow between iport and oport.
>> + * @trace_id: alloc or read the traceid.
>> */
>> struct coresight_ops_link {
>> int (*enable)(struct coresight_device *csdev,
>> @@ -376,6 +377,8 @@ struct coresight_ops_link {
>> void (*disable)(struct coresight_device *csdev,
>> struct coresight_connection *in,
>> struct coresight_connection *out);
>> + int (*trace_id)(struct coresight_device *csdev, enum cs_mode mode,
>> + struct coresight_device *sink);
>> };
>> /**
>> @@ -385,6 +388,7 @@ struct coresight_ops_link {
>> * is associated to.
>> * @enable: enables tracing for a source.
>> * @disable: disables tracing for a source.
>> + * @trace_id: alloc or read the traceid.
>> */
>> struct coresight_ops_source {
>> int (*cpu_id)(struct coresight_device *csdev);
>> @@ -392,6 +396,8 @@ struct coresight_ops_source {
>> enum cs_mode mode, struct coresight_trace_id_map
>> *id_map);
>> void (*disable)(struct coresight_device *csdev,
>> struct perf_event *event);
>> + int (*trace_id)(struct coresight_device *csdev, enum cs_mode mode,
>> + struct coresight_device *sink);
>> };
>> /**
>> @@ -697,4 +703,6 @@ int coresight_init_driver(const char *drv, struct
>> amba_driver *amba_drv,
>> void coresight_remove_driver(struct amba_driver *amba_drv,
>> struct platform_driver *pdev_drv);
>> +int coresight_etm_get_trace_id(struct coresight_device *csdev, enum
>> cs_mode mode,
>> + struct coresight_device *sink);
>> #endif /* _LINUX_COREISGHT_H */
>
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