Introduce coresight_set_percpu_source() for setting CPU source device. The sources are maintained in a per CPU structure 'csdev_source'.
Signed-off-by: Leo Yan leo.yan@arm.com --- drivers/hwtracing/coresight/coresight-core.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 1a4bde5d6cd8fcfdd43bcafb45aa4dc5f1dd2d34..042e8e646ff521a15dc18d7264faa427f1ac0dc7 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -32,6 +32,7 @@ */ DEFINE_MUTEX(coresight_mutex); static DEFINE_PER_CPU(struct coresight_device *, csdev_sink); +static DEFINE_PER_CPU(struct coresight_device *, csdev_source);
/** * struct coresight_node - elements of a path, from source to sink @@ -77,6 +78,11 @@ struct coresight_device *coresight_get_percpu_sink(int cpu) } EXPORT_SYMBOL_GPL(coresight_get_percpu_sink);
+static void coresight_set_percpu_source(int cpu, struct coresight_device *csdev) +{ + per_cpu(csdev_source, cpu) = csdev; +} + static struct coresight_device *coresight_get_source(struct coresight_path *path) { struct coresight_device *csdev; @@ -1390,6 +1396,10 @@ struct coresight_device *coresight_register(struct coresight_desc *desc) goto out_unlock; } } + + if (coresight_is_percpu_source(csdev)) + coresight_set_percpu_source(csdev->cpu, csdev); + /* Device is now registered */ registered = true;
@@ -1421,6 +1431,8 @@ EXPORT_SYMBOL_GPL(coresight_register);
void coresight_unregister(struct coresight_device *csdev) { + if (coresight_is_percpu_source(csdev)) + coresight_set_percpu_source(csdev->cpu, NULL); etm_perf_del_symlink_sink(csdev); /* Remove references of that device in the topology */ if (cti_assoc_ops && cti_assoc_ops->remove)