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Message-ID: <6d426e77-8d74-40d5-88c9-e590de07141c@arm.com>
Date: Tue, 7 May 2024 11:49:31 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: James Clark <james.clark@....com>, linux-perf-users@...r.kernel.org,
gankulkarni@...amperecomputing.com, scclevenger@...amperecomputing.com,
coresight@...ts.linaro.org, mike.leach@...aro.org
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>, John Garry
<john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
Leo Yan <leo.yan@...ux.dev>, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 13/17] coresight: Pass trace ID map into source enable
Hi James
On 29/04/2024 16:21, James Clark wrote:
> This will allow Perf mode to pass in per-sink maps. System sources
> allocate IDs on probe so they don't use this and it's __maybe_unused.
I am wondering if we need this change ? We have event_data associated
with each event and we allocate the traceid from the sink map at
setup_aux. So, why not set the traceid or even link the id_map in the
event_data ?
something like:
struct etm_event_data {
struct work_struct work;
cpumask_t mask;
cpumask_t aux_hwid_done;
void *snk_config;
u32 cfg_hash;
struct list_head * __percpu *path;
+ u8 __percpu *traceid;
};
See my comment in the other patch.
Suzuki
>
> Sysfs mode also has the global map hard coded in various places, so pass
> in NULL when enabling for sysfs. We could bubble the global map all the
> way down to where it's used, but it wouldn't have any functional
> difference, so it's probably not worth the code churn.
>
> Signed-off-by: James Clark <james.clark@....com>
> ---
> drivers/hwtracing/coresight/coresight-dummy.c | 3 ++-
> drivers/hwtracing/coresight/coresight-etm-perf.c | 3 ++-
> drivers/hwtracing/coresight/coresight-etm3x-core.c | 10 +++++-----
> drivers/hwtracing/coresight/coresight-etm4x-core.c | 10 +++++-----
> drivers/hwtracing/coresight/coresight-stm.c | 3 ++-
> drivers/hwtracing/coresight/coresight-sysfs.c | 3 ++-
> drivers/hwtracing/coresight/coresight-tpdm.c | 3 ++-
> include/linux/coresight.h | 2 +-
> 8 files changed, 21 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/hwtracing/coresight/coresight-dummy.c
> index ac70c0b491be..1f1b9ad160f6 100644
> --- a/drivers/hwtracing/coresight/coresight-dummy.c
> +++ b/drivers/hwtracing/coresight/coresight-dummy.c
> @@ -21,7 +21,8 @@ DEFINE_CORESIGHT_DEVLIST(source_devs, "dummy_source");
> DEFINE_CORESIGHT_DEVLIST(sink_devs, "dummy_sink");
>
> static int dummy_source_enable(struct coresight_device *csdev,
> - struct perf_event *event, enum cs_mode mode)
> + struct perf_event *event, enum cs_mode mode,
> + __maybe_unused struct coresight_trace_id_map *id_map)
> {
> dev_dbg(csdev->dev.parent, "Dummy source enabled\n");
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
> index 25f1f87c90d1..177cecae38d9 100644
> --- a/drivers/hwtracing/coresight/coresight-etm-perf.c
> +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
> @@ -496,7 +496,8 @@ static void etm_event_start(struct perf_event *event, int flags)
> goto fail_end_stop;
>
> /* Finally enable the tracer */
> - if (source_ops(csdev)->enable(csdev, event, CS_MODE_PERF))
> + if (source_ops(csdev)->enable(csdev, event, CS_MODE_PERF,
> + coresight_trace_id_map_default()))
> goto fail_disable_path;
>
> /*
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> index b21f5ad94e63..b310bdf19038 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> @@ -482,7 +482,8 @@ void etm_release_trace_id(struct etm_drvdata *drvdata)
> }
>
> static int etm_enable_perf(struct coresight_device *csdev,
> - struct perf_event *event)
> + struct perf_event *event,
> + struct coresight_trace_id_map *id_map)
> {
> struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> int trace_id;
> @@ -501,8 +502,7 @@ static int etm_enable_perf(struct coresight_device *csdev,
> * with perf locks - we know the ID cannot change until perf shuts down
> * the session
> */
> - trace_id = coresight_trace_id_read_cpu_id(drvdata->cpu,
> - coresight_trace_id_map_default());
> + trace_id = coresight_trace_id_read_cpu_id(drvdata->cpu, id_map);
> if (!IS_VALID_CS_TRACE_ID(trace_id)) {
> dev_err(&drvdata->csdev->dev, "Failed to set trace ID for %s on CPU%d\n",
> dev_name(&drvdata->csdev->dev), drvdata->cpu);
> @@ -555,7 +555,7 @@ static int etm_enable_sysfs(struct coresight_device *csdev)
> }
>
> static int etm_enable(struct coresight_device *csdev, struct perf_event *event,
> - enum cs_mode mode)
> + enum cs_mode mode, struct coresight_trace_id_map *id_map)
> {
> int ret;
> struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> @@ -570,7 +570,7 @@ static int etm_enable(struct coresight_device *csdev, struct perf_event *event,
> ret = etm_enable_sysfs(csdev);
> break;
> case CS_MODE_PERF:
> - ret = etm_enable_perf(csdev, event);
> + ret = etm_enable_perf(csdev, event, id_map);
> break;
> default:
> ret = -EINVAL;
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index d16d6efb26fa..02dbb6c4daf5 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -753,7 +753,8 @@ static int etm4_parse_event_config(struct coresight_device *csdev,
> }
>
> static int etm4_enable_perf(struct coresight_device *csdev,
> - struct perf_event *event)
> + struct perf_event *event,
> + struct coresight_trace_id_map *id_map)
> {
> int ret = 0, trace_id;
> struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
> @@ -776,8 +777,7 @@ static int etm4_enable_perf(struct coresight_device *csdev,
> * with perf locks - we know the ID cannot change until perf shuts down
> * the session
> */
> - trace_id = coresight_trace_id_read_cpu_id(drvdata->cpu,
> - coresight_trace_id_map_default());
> + trace_id = coresight_trace_id_read_cpu_id(drvdata->cpu, id_map);
> if (!IS_VALID_CS_TRACE_ID(trace_id)) {
> dev_err(&drvdata->csdev->dev, "Failed to set trace ID for %s on CPU%d\n",
> dev_name(&drvdata->csdev->dev), drvdata->cpu);
> @@ -839,7 +839,7 @@ static int etm4_enable_sysfs(struct coresight_device *csdev)
> }
>
> static int etm4_enable(struct coresight_device *csdev, struct perf_event *event,
> - enum cs_mode mode)
> + enum cs_mode mode, struct coresight_trace_id_map *id_map)
> {
> int ret;
>
> @@ -853,7 +853,7 @@ static int etm4_enable(struct coresight_device *csdev, struct perf_event *event,
> ret = etm4_enable_sysfs(csdev);
> break;
> case CS_MODE_PERF:
> - ret = etm4_enable_perf(csdev, event);
> + ret = etm4_enable_perf(csdev, event, id_map);
> break;
> default:
> ret = -EINVAL;
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index e1c62820dfda..a80ad1de4c23 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -194,7 +194,8 @@ static void stm_enable_hw(struct stm_drvdata *drvdata)
> }
>
> static int stm_enable(struct coresight_device *csdev, struct perf_event *event,
> - enum cs_mode mode)
> + enum cs_mode mode,
> + __maybe_unused struct coresight_trace_id_map *trace_id)
> {
> struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>
> diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c
> index 1e67cc7758d7..a01c9e54e2ed 100644
> --- a/drivers/hwtracing/coresight/coresight-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-sysfs.c
> @@ -9,6 +9,7 @@
> #include <linux/kernel.h>
>
> #include "coresight-priv.h"
> +#include "coresight-trace-id.h"
>
> /*
> * Use IDR to map the hash of the source's device name
> @@ -63,7 +64,7 @@ static int coresight_enable_source_sysfs(struct coresight_device *csdev,
> */
> lockdep_assert_held(&coresight_mutex);
> if (coresight_get_mode(csdev) != CS_MODE_SYSFS) {
> - ret = source_ops(csdev)->enable(csdev, data, mode);
> + ret = source_ops(csdev)->enable(csdev, data, mode, NULL);
> if (ret)
> return ret;
> }
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index a9708ab0d488..0376ad326a2f 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -439,7 +439,8 @@ static void __tpdm_enable(struct tpdm_drvdata *drvdata)
> }
>
> static int tpdm_enable(struct coresight_device *csdev, struct perf_event *event,
> - enum cs_mode mode)
> + enum cs_mode mode,
> + __maybe_unused struct coresight_trace_id_map *id_map)
> {
> struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 7d62b88bfb5c..3a678e5425dc 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -384,7 +384,7 @@ struct coresight_ops_link {
> struct coresight_ops_source {
> int (*cpu_id)(struct coresight_device *csdev);
> int (*enable)(struct coresight_device *csdev, struct perf_event *event,
> - enum cs_mode mode);
> + enum cs_mode mode, struct coresight_trace_id_map *id_map);
> void (*disable)(struct coresight_device *csdev,
> struct perf_event *event);
> };
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