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Message-ID: <CAJ9a7VgGp4YqzN-yx0x+NiZG8now6SCmnimaou2Z=exYcoiegw@mail.gmail.com>
Date: Wed, 5 Mar 2025 11:07:43 +0000
From: Mike Leach <mike.leach@...aro.org>
To: Jie Gan <quic_jiegan@...cinc.com>
Cc: Suzuki K Poulose <suzuki.poulose@....com>, 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>,
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 v15 02/10] Coresight: Add trace_id function to retrieving
the trace ID
Hi,
On Mon, 3 Mar 2025 at 03:30, Jie Gan <quic_jiegan@...cinc.com> wrote:
>
> Add 'trace_id' function pointer in coresight_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>
> ---
> drivers/hwtracing/coresight/coresight-core.c | 30 +++++++++++++++++++
> drivers/hwtracing/coresight/coresight-dummy.c | 13 +++++++-
> .../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 | 5 ++++
> 7 files changed, 71 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
> index ab55e10d4b79..32aa07f4f8c1 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -24,6 +24,7 @@
> #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
> @@ -1557,6 +1558,35 @@ 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);
> +
This is a global funciton so need to check that this csdev is a
source,. and does provide a cpu function before calling it.
> + switch (mode) {
> + case CS_MODE_SYSFS:
> + trace_id = coresight_trace_id_get_cpu_id(cpu);
> + break;
> + case CS_MODE_PERF:
> + if (WARN_ON(!sink))
> + return -EINVAL;
> +
> + 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..b5692ba358c1 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)
> {
> @@ -62,7 +72,8 @@ static const struct coresight_ops_source dummy_source_ops = {
> };
>
> static const struct coresight_ops dummy_source_cs_ops = {
> - .source_ops = &dummy_source_ops,
> + .trace_id = dummy_source_trace_id,
> + .source_ops = &dummy_source_ops,
> };
>
> static const struct coresight_ops_sink dummy_sink_ops = {
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> index c103f4c70f5d..c1dda4bc4a2f 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> @@ -704,6 +704,7 @@ static const struct coresight_ops_source etm_source_ops = {
> };
>
> static const struct coresight_ops etm_cs_ops = {
> + .trace_id = coresight_etm_get_trace_id,
> .source_ops = &etm_source_ops,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 2c1a60577728..cfd116b87460 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -1067,6 +1067,7 @@ static const struct coresight_ops_source etm4_source_ops = {
> };
>
> static const struct coresight_ops etm4_cs_ops = {
> + .trace_id = coresight_etm_get_trace_id,
> .source_ops = &etm4_source_ops,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index b581a30a1cd9..aca25b5e3be2 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -281,12 +281,23 @@ 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,
> };
>
> static const struct coresight_ops stm_cs_ops = {
> + .trace_id = stm_trace_id,
> .source_ops = &stm_source_ops,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> index 573da8427428..94c2201fc8d3 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.c
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -241,12 +241,23 @@ 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,
> };
>
> static const struct coresight_ops tpda_cs_ops = {
> + .trace_id = tpda_trace_id,
> .link_ops = &tpda_link_ops,
> };
>
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index c7cd5886c908..ce9a5e71b261 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -335,6 +335,7 @@ enum cs_mode {
> CS_MODE_PERF,
> };
>
> +#define coresight_ops(csdev) csdev->ops
> #define source_ops(csdev) csdev->ops->source_ops
> #define sink_ops(csdev) csdev->ops->sink_ops
> #define link_ops(csdev) csdev->ops->link_ops
> @@ -421,6 +422,8 @@ struct coresight_ops_panic {
> };
>
> struct coresight_ops {
> + int (*trace_id)(struct coresight_device *csdev, enum cs_mode mode,
> + struct coresight_device *sink);
> const struct coresight_ops_sink *sink_ops;
> const struct coresight_ops_link *link_ops;
> const struct coresight_ops_source *source_ops;
> @@ -709,4 +712,6 @@ 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 */
> --
> 2.34.1
>
--
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK
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