@@ -796,6 +796,12 @@ int coresight_get_cpu(struct device *dev)
}
EXPORT_SYMBOL_GPL(coresight_get_cpu);
+int coresight_get_static_trace_id(struct device *dev, u32 *id)
+{
+ return fwnode_property_read_u32(dev_fwnode(dev), "arm,static-trace-id", id);
+}
+EXPORT_SYMBOL_GPL(coresight_get_static_trace_id);
+
struct coresight_platform_data *
coresight_get_platform_data(struct device *dev)
{
@@ -12,6 +12,12 @@
#include "coresight-trace-id.h"
+enum trace_id_flags {
+ TRACE_ID_ANY = 0x0,
+ TRACE_ID_PREFER_ODD = 0x1,
+ TRACE_ID_REQ_STATIC = 0x2,
+};
+
/* Default trace ID map. Used in sysfs mode and for system sources */
static DEFINE_PER_CPU(atomic_t, id_map_default_cpu_ids) = ATOMIC_INIT(0);
static struct coresight_trace_id_map id_map_default = {
@@ -74,16 +80,18 @@ static int coresight_trace_id_find_odd_id(struct coresight_trace_id_map *id_map)
* Otherwise allocate next available ID.
*/
static int coresight_trace_id_alloc_new_id(struct coresight_trace_id_map *id_map,
- int preferred_id, bool prefer_odd_id)
+ int preferred_id, unsigned int flags)
{
int id = 0;
/* for backwards compatibility, cpu IDs may use preferred value */
- if (IS_VALID_CS_TRACE_ID(preferred_id) &&
- !test_bit(preferred_id, id_map->used_ids)) {
- id = preferred_id;
- goto trace_id_allocated;
- } else if (prefer_odd_id) {
+ if (IS_VALID_CS_TRACE_ID(preferred_id)) {
+ if (!test_bit(preferred_id, id_map->used_ids)) {
+ id = preferred_id;
+ goto trace_id_allocated;
+ } else if (flags & TRACE_ID_REQ_STATIC)
+ return -EINVAL;
+ } else if (flags & TRACE_ID_PREFER_ODD) {
/* may use odd ids to avoid preferred legacy cpu IDs */
id = coresight_trace_id_find_odd_id(id_map);
if (id)
@@ -153,7 +161,7 @@ static int _coresight_trace_id_get_cpu_id(int cpu, struct coresight_trace_id_map
*/
id = coresight_trace_id_alloc_new_id(id_map,
CORESIGHT_LEGACY_CPU_TRACE_ID(cpu),
- false);
+ TRACE_ID_ANY);
if (!IS_VALID_CS_TRACE_ID(id))
goto get_cpu_id_out_unlock;
@@ -188,14 +196,14 @@ static void _coresight_trace_id_put_cpu_id(int cpu, struct coresight_trace_id_ma
DUMP_ID_MAP(id_map);
}
-static int coresight_trace_id_map_get_system_id(struct coresight_trace_id_map *id_map)
+static int coresight_trace_id_map_get_system_id(struct coresight_trace_id_map *id_map,
+ int preferred_id, unsigned int traceid_flags)
{
unsigned long flags;
int id;
spin_lock_irqsave(&id_map->lock, flags);
- /* prefer odd IDs for system components to avoid legacy CPU IDS */
- id = coresight_trace_id_alloc_new_id(id_map, 0, true);
+ id = coresight_trace_id_alloc_new_id(id_map, preferred_id, traceid_flags);
spin_unlock_irqrestore(&id_map->lock, flags);
DUMP_ID(id);
@@ -255,10 +263,19 @@ EXPORT_SYMBOL_GPL(coresight_trace_id_read_cpu_id_map);
int coresight_trace_id_get_system_id(void)
{
- return coresight_trace_id_map_get_system_id(&id_map_default);
+ /* prefer odd IDs for system components to avoid legacy CPU IDS */
+ return coresight_trace_id_map_get_system_id(&id_map_default, 0,
+ TRACE_ID_PREFER_ODD);
}
EXPORT_SYMBOL_GPL(coresight_trace_id_get_system_id);
+int coresight_trace_id_get_static_system_id(int trace_id)
+{
+ return coresight_trace_id_map_get_system_id(&id_map_default,
+ trace_id, TRACE_ID_REQ_STATIC);
+}
+EXPORT_SYMBOL_GPL(coresight_trace_id_get_static_system_id);
+
void coresight_trace_id_put_system_id(int id)
{
coresight_trace_id_map_put_system_id(&id_map_default, id);
@@ -116,6 +116,15 @@ int coresight_trace_id_read_cpu_id_map(int cpu, struct coresight_trace_id_map *i
*/
int coresight_trace_id_get_system_id(void);
+/**
+ * Allocate a CoreSight static trace ID for a system component.
+ *
+ * Used to allocate static IDs for system trace sources such as dummy source.
+ *
+ * return: Trace ID or -EINVAL if allocation is impossible.
+ */
+int coresight_trace_id_get_static_system_id(int id);
+
/**
* Release an allocated system trace ID.
*
@@ -662,6 +662,7 @@ void coresight_relaxed_write64(struct coresight_device *csdev,
void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset);
extern int coresight_get_cpu(struct device *dev);
+extern int coresight_get_static_trace_id(struct device *dev, u32 *id);
struct coresight_platform_data *coresight_get_platform_data(struct device *dev);
struct coresight_connection *