[RFC][PATCH 05/21] tracing: Add ring buffer event param to hist field functions

[Tom Zanussi]

Some events such as timestamps require access to a ring_buffer_event
struct; add a param so that hist field functions can access that.

Signed-off-by: Tom Zanussi <tom.zanu...@linux.intel.com>
---
 kernel/trace/trace_events_hist.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 902df2c..38faa08 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -25,7 +25,8 @@
 
 struct hist_field;
 
-typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event);
+typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event,
+                               struct ring_buffer_event *rbe);
 
 #define HIST_FIELD_OPERANDS_MAX        2
 
@@ -39,24 +40,28 @@ struct hist_field {
        struct hist_field               *operands[HIST_FIELD_OPERANDS_MAX];
 };
 
-static u64 hist_field_none(struct hist_field *field, void *event)
+static u64 hist_field_none(struct hist_field *field, void *event,
+                          struct ring_buffer_event *rbe)
 {
        return 0;
 }
 
-static u64 hist_field_counter(struct hist_field *field, void *event)
+static u64 hist_field_counter(struct hist_field *field, void *event,
+                             struct ring_buffer_event *rbe)
 {
        return 1;
 }
 
-static u64 hist_field_string(struct hist_field *hist_field, void *event)
+static u64 hist_field_string(struct hist_field *hist_field, void *event,
+                            struct ring_buffer_event *rbe)
 {
        char *addr = (char *)(event + hist_field->field->offset);
 
        return (u64)(unsigned long)addr;
 }
 
-static u64 hist_field_dynstring(struct hist_field *hist_field, void *event)
+static u64 hist_field_dynstring(struct hist_field *hist_field, void *event,
+                               struct ring_buffer_event *rbe)
 {
        u32 str_item = *(u32 *)(event + hist_field->field->offset);
        int str_loc = str_item & 0xffff;
@@ -65,24 +70,28 @@ static u64 hist_field_dynstring(struct hist_field 
*hist_field, void *event)
        return (u64)(unsigned long)addr;
 }
 
-static u64 hist_field_pstring(struct hist_field *hist_field, void *event)
+static u64 hist_field_pstring(struct hist_field *hist_field, void *event,
+                             struct ring_buffer_event *rbe)
 {
        char **addr = (char **)(event + hist_field->field->offset);
 
        return (u64)(unsigned long)*addr;
 }
 
-static u64 hist_field_log2(struct hist_field *hist_field, void *event)
+static u64 hist_field_log2(struct hist_field *hist_field, void *event,
+                          struct ring_buffer_event *rbe)
 {
        struct hist_field *operand = hist_field->operands[0];
 
-       u64 val = operand->fn(operand, event);
+       u64 val = operand->fn(operand, event, rbe);
 
        return (u64) ilog2(roundup_pow_of_two(val));
 }
 
 #define DEFINE_HIST_FIELD_FN(type)                                     \
-static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
+       static u64 hist_field_##type(struct hist_field *hist_field,     \
+                                    void *event,                       \
+                                    struct ring_buffer_event *rbe)     \
 {                                                                      \
        type *addr = (type *)(event + hist_field->field->offset);       \
                                                                        \
@@ -869,8 +878,8 @@ static bool need_tracing_map_ops(struct hist_trigger_data 
*hist_data)
 }
 
 static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
-                                   struct tracing_map_elt *elt,
-                                   void *rec)
+                                   struct tracing_map_elt *elt, void *rec,
+                                   struct ring_buffer_event *rbe)
 {
        struct hist_field *hist_field;
        unsigned int i;
@@ -878,7 +887,7 @@ static void hist_trigger_elt_update(struct 
hist_trigger_data *hist_data,
 
        for_each_hist_val_field(i, hist_data) {
                hist_field = hist_data->fields[i];
-               hist_val = hist_field->fn(hist_field, rec);
+               hist_val = hist_field->fn(hist_field, rec, rbe);
                tracing_map_update_sum(elt, i, hist_val);
        }
 }
@@ -908,7 +917,7 @@ static inline void add_to_key(char *compound_key, void *key,
 }
 
 static void event_hist_trigger(struct event_trigger_data *data, void *rec,
-                              struct ring_buffer_event *event)
+                              struct ring_buffer_event *rbe)
 {
        struct hist_trigger_data *hist_data = data->private_data;
        bool use_compound_key = (hist_data->n_keys > 1);
@@ -937,7 +946,7 @@ static void event_hist_trigger(struct event_trigger_data 
*data, void *rec,
 
                        key = entries;
                } else {
-                       field_contents = key_field->fn(key_field, rec);
+                       field_contents = key_field->fn(key_field, rec, rbe);
                        if (key_field->flags & HIST_FIELD_FL_STRING) {
                                key = (void *)(unsigned long)field_contents;
                                use_compound_key = true;
@@ -954,7 +963,7 @@ static void event_hist_trigger(struct event_trigger_data 
*data, void *rec,
 
        elt = tracing_map_insert(hist_data->map, key);
        if (elt)
-               hist_trigger_elt_update(hist_data, elt, rec);
+               hist_trigger_elt_update(hist_data, elt, rec, rbe);
 }
 
 static void hist_trigger_stacktrace_print(struct seq_file *m,
-- 
1.9.3