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tracing: Pass tracing_map_elt to hist_field accessor functions
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Some accessor functions, such as for variable references, require
access to a corrsponding tracing_map_elt.

Add a tracing_map_elt param to the function signature and update the
accessor functions accordingly.

Link: http://lkml.kernel.org/r/e0f292b068e9e4948da1d5af21b5ae0efa9b5717.1516069914.git.tom.zanussi@linux.intel.com

Signed-off-by: Tom Zanussi <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
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@tzanussi @rostedt
tzanussi authored and rostedt committed Mar 10, 2018
1 parent af6a29b commit df35d93
Showing 1 changed file with 57 additions and 34 deletions.
91 changes: 57 additions & 34 deletions kernel/trace/trace_events_hist.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,8 +26,10 @@

struct hist_field;

typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event,
struct ring_buffer_event *rbe);
typedef u64 (*hist_field_fn_t) (struct hist_field *field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event);

#define HIST_FIELD_OPERANDS_MAX 2
#define HIST_FIELDS_MAX (TRACING_MAP_FIELDS_MAX + TRACING_MAP_VARS_MAX)
Expand Down Expand Up @@ -59,28 +61,36 @@ struct hist_field {
char *name;
};

static u64 hist_field_none(struct hist_field *field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_none(struct hist_field *field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
return 0;
}

static u64 hist_field_counter(struct hist_field *field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_counter(struct hist_field *field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
return 1;
}

static u64 hist_field_string(struct hist_field *hist_field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_string(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
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,
struct ring_buffer_event *rbe)
static u64 hist_field_dynstring(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
u32 str_item = *(u32 *)(event + hist_field->field->offset);
int str_loc = str_item & 0xffff;
Expand All @@ -89,63 +99,74 @@ 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,
struct ring_buffer_event *rbe)
static u64 hist_field_pstring(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
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,
struct ring_buffer_event *rbe)
static u64 hist_field_log2(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
struct hist_field *operand = hist_field->operands[0];

u64 val = operand->fn(operand, event, rbe);
u64 val = operand->fn(operand, elt, rbe, event);

return (u64) ilog2(roundup_pow_of_two(val));
}

static u64 hist_field_plus(struct hist_field *hist_field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_plus(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

u64 val1 = operand1->fn(operand1, event, rbe);
u64 val2 = operand2->fn(operand2, event, rbe);
u64 val1 = operand1->fn(operand1, elt, rbe, event);
u64 val2 = operand2->fn(operand2, elt, rbe, event);

return val1 + val2;
}

static u64 hist_field_minus(struct hist_field *hist_field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_minus(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
struct hist_field *operand1 = hist_field->operands[0];
struct hist_field *operand2 = hist_field->operands[1];

u64 val1 = operand1->fn(operand1, event, rbe);
u64 val2 = operand2->fn(operand2, event, rbe);
u64 val1 = operand1->fn(operand1, elt, rbe, event);
u64 val2 = operand2->fn(operand2, elt, rbe, event);

return val1 - val2;
}

static u64 hist_field_unary_minus(struct hist_field *hist_field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_unary_minus(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
struct hist_field *operand = hist_field->operands[0];

s64 sval = (s64)operand->fn(operand, event, rbe);
s64 sval = (s64)operand->fn(operand, elt, rbe, event);
u64 val = (u64)-sval;

return val;
}

#define DEFINE_HIST_FIELD_FN(type) \
static u64 hist_field_##type(struct hist_field *hist_field, \
void *event, \
struct ring_buffer_event *rbe) \
struct tracing_map_elt *elt, \
struct ring_buffer_event *rbe, \
void *event) \
{ \
type *addr = (type *)(event + hist_field->field->offset); \
\
Expand Down Expand Up @@ -233,8 +254,10 @@ struct hist_trigger_data {
bool remove;
};

static u64 hist_field_timestamp(struct hist_field *hist_field, void *event,
struct ring_buffer_event *rbe)
static u64 hist_field_timestamp(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
void *event)
{
struct hist_trigger_data *hist_data = hist_field->hist_data;
struct trace_array *tr = hist_data->event_file->tr;
Expand Down Expand Up @@ -1570,7 +1593,7 @@ 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, rbe);
hist_val = hist_field->fn(hist_field, elt, rbe, rec);
if (hist_field->flags & HIST_FIELD_FL_VAR) {
var_idx = hist_field->var.idx;
tracing_map_set_var(elt, var_idx, hist_val);
Expand All @@ -1582,7 +1605,7 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
for_each_hist_key_field(i, hist_data) {
hist_field = hist_data->fields[i];
if (hist_field->flags & HIST_FIELD_FL_VAR) {
hist_val = hist_field->fn(hist_field, rec, rbe);
hist_val = hist_field->fn(hist_field, elt, rbe, rec);
var_idx = hist_field->var.idx;
tracing_map_set_var(elt, var_idx, hist_val);
}
Expand Down Expand Up @@ -1620,9 +1643,9 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec,
bool use_compound_key = (hist_data->n_keys > 1);
unsigned long entries[HIST_STACKTRACE_DEPTH];
char compound_key[HIST_KEY_SIZE_MAX];
struct tracing_map_elt *elt = NULL;
struct stack_trace stacktrace;
struct hist_field *key_field;
struct tracing_map_elt *elt;
u64 field_contents;
void *key = NULL;
unsigned int i;
Expand All @@ -1643,7 +1666,7 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec,

key = entries;
} else {
field_contents = key_field->fn(key_field, rec, rbe);
field_contents = key_field->fn(key_field, elt, rbe, rec);
if (key_field->flags & HIST_FIELD_FL_STRING) {
key = (void *)(unsigned long)field_contents;
use_compound_key = true;
Expand Down

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