coresight: Remove .cpu_id() callback from source ops

The CPU ID can be fetched directly from the coresight_device structure,
so the .cpu_id() callback is no longer needed.

Remove the .cpu_id() callback from source ops and update callers
accordingly.

Tested-by: Jie Gan <jie.gan@oss.qualcomm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20260515-arm_coresight_path_power_management_improvement-v14-5-f88c4a3ecfe9@arm.com

6 files changed, 7 insertions, 26 deletions

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index ffed314d1313..5c711e517501 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -799,7 +799,7 @@ static int _coresight_build_path(struct coresight_device *csdev,
 		goto out;
 
 	if (coresight_is_percpu_source(csdev) && coresight_is_percpu_sink(sink) &&
-	    sink == per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev))) {
+	    sink == per_cpu(csdev_sink, csdev->cpu)) {
 		if (_coresight_build_path(sink, source, sink, path) == 0) {
 			found = true;
 			goto out;
@@ -1026,7 +1026,7 @@ coresight_find_default_sink(struct coresight_device *csdev)
 	/* look for a default sink if we have not found for this device */
 	if (!csdev->def_sink) {
 		if (coresight_is_percpu_source(csdev))
-			csdev->def_sink = per_cpu(csdev_sink, source_ops(csdev)->cpu_id(csdev));
+			csdev->def_sink = per_cpu(csdev_sink, csdev->cpu);
 		if (!csdev->def_sink)
 			csdev->def_sink = coresight_find_sink(csdev, &depth);
 	}
@@ -1764,10 +1764,10 @@ int coresight_etm_get_trace_id(struct coresight_device *csdev, enum cs_mode mode
 {
 	int cpu, trace_id;
 
-	if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE || !source_ops(csdev)->cpu_id)
+	if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE)
 		return -EINVAL;
 
-	cpu = source_ops(csdev)->cpu_id(csdev);
+	cpu = csdev->cpu;
 	switch (mode) {
 	case CS_MODE_SYSFS:
 		trace_id = coresight_trace_id_get_cpu_id(cpu);
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index 89ba7c9a6613..7434f68d4482 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -825,7 +825,7 @@ static void etm_addr_filters_sync(struct perf_event *event)
 int etm_perf_symlink(struct coresight_device *csdev, bool link)
 {
 	char entry[sizeof("cpu9999999")];
-	int ret = 0, cpu = source_ops(csdev)->cpu_id(csdev);
+	int ret = 0, cpu = csdev->cpu;
 	struct device *pmu_dev = etm_pmu.dev;
 	struct device *cs_dev = &csdev->dev;
 
diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c
index eb665db1a37d..ab47f69e923f 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
@@ -466,13 +466,6 @@ static void etm_enable_sysfs_smp_call(void *info)
 		coresight_set_mode(csdev, CS_MODE_DISABLED);
 }
 
-static int etm_cpu_id(struct coresight_device *csdev)
-{
-	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
-
-	return drvdata->cpu;
-}
-
 void etm_release_trace_id(struct etm_drvdata *drvdata)
 {
 	coresight_trace_id_put_cpu_id(drvdata->cpu);
@@ -684,7 +677,6 @@ static void etm_disable(struct coresight_device *csdev,
 }
 
 static const struct coresight_ops_source etm_source_ops = {
-	.cpu_id		= etm_cpu_id,
 	.enable		= etm_enable,
 	.disable	= etm_disable,
 };
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index 8f270bfc7472..b7312570a7ae 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -231,13 +231,6 @@ static void etm4_cs_unlock(struct etmv4_drvdata *drvdata,
 		CS_UNLOCK(csa->base);
 }
 
-static int etm4_cpu_id(struct coresight_device *csdev)
-{
-	struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
-
-	return drvdata->cpu;
-}
-
 void etm4_release_trace_id(struct etmv4_drvdata *drvdata)
 {
 	coresight_trace_id_put_cpu_id(drvdata->cpu);
@@ -1205,7 +1198,6 @@ static void etm4_pause_perf(struct coresight_device *csdev)
 }
 
 static const struct coresight_ops_source etm4_source_ops = {
-	.cpu_id		= etm4_cpu_id,
 	.enable		= etm4_enable,
 	.disable	= etm4_disable,
 	.resume_perf	= etm4_resume_perf,
diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c
index da6f22b512c9..905c973e99ce 100644
--- a/drivers/hwtracing/coresight/coresight-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-sysfs.c
@@ -232,7 +232,7 @@ int coresight_enable_sysfs(struct coresight_device *csdev)
 		 * be a single session per tracer (when working from sysFS)
 		 * a per-cpu variable will do just fine.
 		 */
-		cpu = source_ops(csdev)->cpu_id(csdev);
+		cpu = csdev->cpu;
 		per_cpu(tracer_path, cpu) = path;
 		break;
 	case CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE:
@@ -284,7 +284,7 @@ void coresight_disable_sysfs(struct coresight_device *csdev)
 
 	switch (csdev->subtype.source_subtype) {
 	case CORESIGHT_DEV_SUBTYPE_SOURCE_PROC:
-		cpu = source_ops(csdev)->cpu_id(csdev);
+		cpu = csdev->cpu;
 		path = per_cpu(tracer_path, cpu);
 		per_cpu(tracer_path, cpu) = NULL;
 		break;
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 687190ca11dd..e9c20ceb9016 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -395,15 +395,12 @@ struct coresight_ops_link {
 /**
  * struct coresight_ops_source - basic operations for a source
  * Operations available for sources.
- * @cpu_id:	returns the value of the CPU number this component
- *		is associated to.
  * @enable:	enables tracing for a source.
  * @disable:	disables tracing for a source.
  * @resume_perf: resumes tracing for a source in perf session.
  * @pause_perf:	pauses tracing for a source in perf session.
  */
 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, struct coresight_path *path);
 	void (*disable)(struct coresight_device *csdev,