Commit fd30b085 authored by Mike Leach's avatar Mike Leach Committed by Suzuki K Poulose
Browse files

coresight: trace-id: Add debug & test macros to Trace ID allocation 



Adds in a number of pr_debug macros to allow the debugging and test of
the trace ID allocation system.

Signed-off-by: default avatarMike Leach <mike.leach@linaro.org>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230116124928.5440-15-mike.leach@linaro.org
parent aa19bb4c

drivers/hwtracing/coresight/coresight-trace-id.c

+33 −0
Original line number Diff line number Diff line
@@ -24,6 +24,27 @@ static atomic_t perf_cs_etm_session_active = ATOMIC_INIT(0); 
/* lock to protect id_map and cpu data  */

static DEFINE_SPINLOCK(id_map_lock);



/* #define TRACE_ID_DEBUG 1 */

#if defined(TRACE_ID_DEBUG) || defined(CONFIG_COMPILE_TEST)



static void coresight_trace_id_dump_table(struct coresight_trace_id_map *id_map,

					  const char *func_name)

{

	pr_debug("%s id_map::\n", func_name);

	pr_debug("Used = %*pb\n", CORESIGHT_TRACE_IDS_MAX, id_map->used_ids);

	pr_debug("Pend = %*pb\n", CORESIGHT_TRACE_IDS_MAX, id_map->pend_rel_ids);

}

#define DUMP_ID_MAP(map)   coresight_trace_id_dump_table(map, __func__)

#define DUMP_ID_CPU(cpu, id) pr_debug("%s called;  cpu=%d, id=%d\n", __func__, cpu, id)

#define DUMP_ID(id)   pr_debug("%s called; id=%d\n", __func__, id)

#define PERF_SESSION(n) pr_debug("%s perf count %d\n", __func__, n)

#else

#define DUMP_ID_MAP(map)

#define DUMP_ID(id)

#define DUMP_ID_CPU(cpu, id)

#define PERF_SESSION(n)

#endif



/* unlocked read of current trace ID value for given CPU */

static int _coresight_trace_id_read_cpu_id(int cpu)

{
@@ -127,6 +148,7 @@ static void coresight_trace_id_release_all_pending(void) 
		cpumask_clear_cpu(cpu, &cpu_id_release_pending);

	}

	spin_unlock_irqrestore(&id_map_lock, flags);

	DUMP_ID_MAP(id_map);

}



static int coresight_trace_id_map_get_cpu_id(int cpu, struct coresight_trace_id_map *id_map)
@@ -168,6 +190,8 @@ static int coresight_trace_id_map_get_cpu_id(int cpu, struct coresight_trace_id_ 
get_cpu_id_out_unlock:

	spin_unlock_irqrestore(&id_map_lock, flags);



	DUMP_ID_CPU(cpu, id);

	DUMP_ID_MAP(id_map);

	return id;

}
@@ -194,6 +218,8 @@ static void coresight_trace_id_map_put_cpu_id(int cpu, struct coresight_trace_id 
	}



	spin_unlock_irqrestore(&id_map_lock, flags);

	DUMP_ID_CPU(cpu, id);

	DUMP_ID_MAP(id_map);

}



static int coresight_trace_id_map_get_system_id(struct coresight_trace_id_map *id_map)
@@ -206,6 +232,8 @@ static int coresight_trace_id_map_get_system_id(struct coresight_trace_id_map *i 
	id = coresight_trace_id_alloc_new_id(id_map, 0, true);

	spin_unlock_irqrestore(&id_map_lock, flags);



	DUMP_ID(id);

	DUMP_ID_MAP(id_map);

	return id;

}
@@ -216,6 +244,9 @@ static void coresight_trace_id_map_put_system_id(struct coresight_trace_id_map * 
	spin_lock_irqsave(&id_map_lock, flags);

	coresight_trace_id_free(id, id_map);

	spin_unlock_irqrestore(&id_map_lock, flags);



	DUMP_ID(id);

	DUMP_ID_MAP(id_map);

}



/* API functions */
@@ -253,6 +284,7 @@ EXPORT_SYMBOL_GPL(coresight_trace_id_put_system_id); 
void coresight_trace_id_perf_start(void)

{

	atomic_inc(&perf_cs_etm_session_active);

	PERF_SESSION(atomic_read(&perf_cs_etm_session_active));

}

EXPORT_SYMBOL_GPL(coresight_trace_id_perf_start);
@@ -260,5 +292,6 @@ void coresight_trace_id_perf_stop(void) 
{

	if (!atomic_dec_return(&perf_cs_etm_session_active))

		coresight_trace_id_release_all_pending();

	PERF_SESSION(atomic_read(&perf_cs_etm_session_active));

}

EXPORT_SYMBOL_GPL(coresight_trace_id_perf_stop);