| Message ID | 20220704081149.16797-8-mike.leach@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | coresight: Add new API to allocate trace source ID values | expand |
Hi Mike, On 04/07/2022 09:11, Mike Leach wrote: > Adds in notifier calls to the trace ID allocator that perf > events are starting and stopping. > > This ensures that Trace IDs associated with CPUs remain the same > throughout the perf session, and are only released when all perf > sessions are complete. The patch looks fine to me. I think it would be good to add the definition of coresight_trace_id_perf_{stop,start}() in this patch. > > Signed-off-by: Mike Leach <mike.leach@linaro.org> > --- > drivers/hwtracing/coresight/coresight-etm-perf.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c > index c039b6ae206f..ad3fdc07c60b 100644 > --- a/drivers/hwtracing/coresight/coresight-etm-perf.c > +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c > @@ -22,6 +22,7 @@ > #include "coresight-etm-perf.h" > #include "coresight-priv.h" > #include "coresight-syscfg.h" > +#include "coresight-trace-id.h" > > static struct pmu etm_pmu; > static bool etm_perf_up; > @@ -228,6 +229,9 @@ static void free_event_data(struct work_struct *work) > *ppath = NULL; > } > > + /* mark perf event as done for trace id allocator */ > + coresight_trace_id_perf_stop(); > + > free_percpu(event_data->path); > kfree(event_data); > } > @@ -314,6 +318,9 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, > sink = user_sink = coresight_get_sink_by_id(id); > } > > + /* tell the trace ID allocator that a perf event is starting up */ > + coresight_trace_id_perf_start(); > + > /* check if user wants a coresight configuration selected */ > cfg_hash = (u32)((event->attr.config2 & GENMASK_ULL(63, 32)) >> 32); > if (cfg_hash) { Suzuki
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c index c039b6ae206f..ad3fdc07c60b 100644 --- a/drivers/hwtracing/coresight/coresight-etm-perf.c +++ b/drivers/hwtracing/coresight/coresight-etm-perf.c @@ -22,6 +22,7 @@ #include "coresight-etm-perf.h" #include "coresight-priv.h" #include "coresight-syscfg.h" +#include "coresight-trace-id.h" static struct pmu etm_pmu; static bool etm_perf_up; @@ -228,6 +229,9 @@ static void free_event_data(struct work_struct *work) *ppath = NULL; } + /* mark perf event as done for trace id allocator */ + coresight_trace_id_perf_stop(); + free_percpu(event_data->path); kfree(event_data); } @@ -314,6 +318,9 @@ static void *etm_setup_aux(struct perf_event *event, void **pages, sink = user_sink = coresight_get_sink_by_id(id); } + /* tell the trace ID allocator that a perf event is starting up */ + coresight_trace_id_perf_start(); + /* check if user wants a coresight configuration selected */ cfg_hash = (u32)((event->attr.config2 & GENMASK_ULL(63, 32)) >> 32); if (cfg_hash) {
Adds in notifier calls to the trace ID allocator that perf events are starting and stopping. This ensures that Trace IDs associated with CPUs remain the same throughout the perf session, and are only released when all perf sessions are complete. Signed-off-by: Mike Leach <mike.leach@linaro.org> --- drivers/hwtracing/coresight/coresight-etm-perf.c | 7 +++++++ 1 file changed, 7 insertions(+)