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Commit 7d18a10c authored by Tom Zanussi's avatar Tom Zanussi Committed by Steven Rostedt (VMware)
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tracing: Refactor hist trigger action code 

The hist trigger action code currently implements two essentially
hard-coded pairs of 'actions' - onmax(), which tracks a variable and
saves some event fields when a max is hit, and onmatch(), which is
hard-coded to generate a synthetic event.

These hardcoded pairs (track max/save fields and detect match/generate
synthetic event) should really be decoupled into separate components
that can then be arbitrarily combined.  The first component of each
pair (track max/detect match) is called a 'handler' in the new code,
while the second component (save fields/generate synthetic event) is
called an 'action' in this scheme.

This change refactors the action code to reflect this split by adding
two handlers, HANDLER_ONMATCH and HANDLER_ONMAX, along with two
actions, ACTION_SAVE and ACTION_TRACE.

The new code combines them to produce the existing ONMATCH/TRACE and
ONMAX/SAVE functionality, but doesn't implement the other combinations
now possible.  Future patches will expand these to further useful
cases, such as ONMAX/TRACE, as well as add additional handlers and
actions such as ONCHANGE and SNAPSHOT.

Also, add abbreviated documentation for handlers and actions to
README.

Link: http://lkml.kernel.org/r/98bfdd48c1b4ff29fc5766442f99f5bc3c34b76b.1550100284.git.tom.zanussi@linux.intel.comSigned-off-by: default avatarTom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent e7f0c424
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Inline Side-by-side
Showing with 238 additions and 169 deletions
kernel/trace/trace_events_hist.c
View file @ 7d18a10c
...@@ -313,9 +313,9 @@ struct hist_trigger_data { ...@@ -313,9 +313,9 @@ struct hist_trigger_data {
struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX]; struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
unsigned int n_field_var_hists; unsigned int n_field_var_hists;
struct field_var *max_vars[SYNTH_FIELDS_MAX]; struct field_var *save_vars[SYNTH_FIELDS_MAX];
unsigned int n_max_vars; unsigned int n_save_vars;
unsigned int n_max_var_str; unsigned int n_save_var_str;
}; };
static int synth_event_create(int argc, const char **argv); static int synth_event_create(int argc, const char **argv);
...@@ -383,11 +383,25 @@ struct action_data; ...@@ -383,11 +383,25 @@ struct action_data;
typedef void (*action_fn_t) (struct hist_trigger_data *hist_data, typedef void (*action_fn_t) (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 ring_buffer_event *rbe, void *key,
struct action_data *data, u64 *var_ref_vals); struct action_data *data, u64 *var_ref_vals);
enum handler_id {
HANDLER_ONMATCH = 1,
HANDLER_ONMAX,
};
enum action_id {
ACTION_SAVE = 1,
ACTION_TRACE,
};
struct action_data { struct action_data {
enum handler_id handler;
enum action_id action;
char *action_name;
action_fn_t fn; action_fn_t fn;
unsigned int n_params; unsigned int n_params;
char *params[SYNTH_FIELDS_MAX]; char *params[SYNTH_FIELDS_MAX];
...@@ -404,13 +418,11 @@ struct action_data { ...@@ -404,13 +418,11 @@ struct action_data {
unsigned int var_ref_idx; unsigned int var_ref_idx;
char *match_event; char *match_event;
char *match_event_system; char *match_event_system;
char *synth_event_name;
struct synth_event *synth_event; struct synth_event *synth_event;
} onmatch; } onmatch;
struct { struct {
char *var_str; char *var_str;
char *fn_name;
unsigned int max_var_ref_idx; unsigned int max_var_ref_idx;
struct hist_field *max_var; struct hist_field *max_var;
struct hist_field *var; struct hist_field *var;
...@@ -1078,7 +1090,7 @@ static struct synth_event *alloc_synth_event(const char *name, int n_fields, ...@@ -1078,7 +1090,7 @@ static struct synth_event *alloc_synth_event(const char *name, int n_fields,
static void action_trace(struct hist_trigger_data *hist_data, static void action_trace(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 ring_buffer_event *rbe, void *key,
struct action_data *data, u64 *var_ref_vals) struct action_data *data, u64 *var_ref_vals)
{ {
struct synth_event *event = data->onmatch.synth_event; struct synth_event *event = data->onmatch.synth_event;
...@@ -1644,7 +1656,7 @@ find_match_var(struct hist_trigger_data *hist_data, char *var_name) ...@@ -1644,7 +1656,7 @@ find_match_var(struct hist_trigger_data *hist_data, char *var_name)
for (i = 0; i < hist_data->n_actions; i++) { for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i]; struct action_data *data = hist_data->actions[i];
if (data->fn == action_trace) { if (data->handler == HANDLER_ONMATCH) {
char *system = data->onmatch.match_event_system; char *system = data->onmatch.match_event_system;
char *event_name = data->onmatch.match_event; char *event_name = data->onmatch.match_event;
...@@ -2076,7 +2088,7 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt) ...@@ -2076,7 +2088,7 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
} }
} }
n_str = hist_data->n_field_var_str + hist_data->n_max_var_str; n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
size = STR_VAR_LEN_MAX; size = STR_VAR_LEN_MAX;
...@@ -3050,7 +3062,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data, ...@@ -3050,7 +3062,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
int ret; int ret;
if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) { if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
hist_err_event("onmatch: Too many field variables defined: ", hist_err_event("trace action: Too many field variables defined: ",
subsys_name, event_name, field_name); subsys_name, event_name, field_name);
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
...@@ -3058,7 +3070,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data, ...@@ -3058,7 +3070,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
file = event_file(tr, subsys_name, event_name); file = event_file(tr, subsys_name, event_name);
if (IS_ERR(file)) { if (IS_ERR(file)) {
hist_err_event("onmatch: Event file not found: ", hist_err_event("trace action: Event file not found: ",
subsys_name, event_name, field_name); subsys_name, event_name, field_name);
ret = PTR_ERR(file); ret = PTR_ERR(file);
return ERR_PTR(ret); return ERR_PTR(ret);
...@@ -3072,7 +3084,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data, ...@@ -3072,7 +3084,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
*/ */
hist_data = find_compatible_hist(target_hist_data, file); hist_data = find_compatible_hist(target_hist_data, file);
if (!hist_data) { if (!hist_data) {
hist_err_event("onmatch: Matching event histogram not found: ", hist_err_event("trace action: Matching event histogram not found: ",
subsys_name, event_name, field_name); subsys_name, event_name, field_name);
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
...@@ -3134,7 +3146,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data, ...@@ -3134,7 +3146,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
kfree(cmd); kfree(cmd);
kfree(var_hist->cmd); kfree(var_hist->cmd);
kfree(var_hist); kfree(var_hist);
hist_err_event("onmatch: Couldn't create histogram for field: ", hist_err_event("trace action: Couldn't create histogram for field: ",
subsys_name, event_name, field_name); subsys_name, event_name, field_name);
return ERR_PTR(ret); return ERR_PTR(ret);
} }
...@@ -3147,7 +3159,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data, ...@@ -3147,7 +3159,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
if (IS_ERR_OR_NULL(event_var)) { if (IS_ERR_OR_NULL(event_var)) {
kfree(var_hist->cmd); kfree(var_hist->cmd);
kfree(var_hist); kfree(var_hist);
hist_err_event("onmatch: Couldn't find synthetic variable: ", hist_err_event("trace action: Couldn't find synthetic variable: ",
subsys_name, event_name, field_name); subsys_name, event_name, field_name);
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
} }
...@@ -3230,8 +3242,8 @@ static void update_max_vars(struct hist_trigger_data *hist_data, ...@@ -3230,8 +3242,8 @@ static void update_max_vars(struct hist_trigger_data *hist_data,
struct ring_buffer_event *rbe, struct ring_buffer_event *rbe,
void *rec) void *rec)
{ {
__update_field_vars(elt, rbe, rec, hist_data->max_vars, __update_field_vars(elt, rbe, rec, hist_data->save_vars,
hist_data->n_max_vars, hist_data->n_field_var_str); hist_data->n_save_vars, hist_data->n_field_var_str);
} }
static struct hist_field *create_var(struct hist_trigger_data *hist_data, static struct hist_field *create_var(struct hist_trigger_data *hist_data,
...@@ -3375,9 +3387,9 @@ static void onmax_print(struct seq_file *m, ...@@ -3375,9 +3387,9 @@ static void onmax_print(struct seq_file *m,
seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx)); seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx));
for (i = 0; i < hist_data->n_max_vars; i++) { for (i = 0; i < hist_data->n_save_vars; i++) {
struct hist_field *save_val = hist_data->max_vars[i]->val; struct hist_field *save_val = hist_data->save_vars[i]->val;
struct hist_field *save_var = hist_data->max_vars[i]->var; struct hist_field *save_var = hist_data->save_vars[i]->var;
u64 val; u64 val;
save_var_idx = save_var->var.idx; save_var_idx = save_var->var.idx;
...@@ -3394,7 +3406,7 @@ static void onmax_print(struct seq_file *m, ...@@ -3394,7 +3406,7 @@ static void onmax_print(struct seq_file *m,
static void onmax_save(struct hist_trigger_data *hist_data, static void onmax_save(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 ring_buffer_event *rbe, void *key,
struct action_data *data, u64 *var_ref_vals) struct action_data *data, u64 *var_ref_vals)
{ {
unsigned int max_idx = data->onmax.max_var->var.idx; unsigned int max_idx = data->onmax.max_var->var.idx;
...@@ -3421,7 +3433,7 @@ static void onmax_destroy(struct action_data *data) ...@@ -3421,7 +3433,7 @@ static void onmax_destroy(struct action_data *data)
destroy_hist_field(data->onmax.var, 0); destroy_hist_field(data->onmax.var, 0);
kfree(data->onmax.var_str); kfree(data->onmax.var_str);
kfree(data->onmax.fn_name); kfree(data->action_name);
for (i = 0; i < data->n_params; i++) for (i = 0; i < data->n_params; i++)
kfree(data->params[i]); kfree(data->params[i]);
...@@ -3429,15 +3441,16 @@ static void onmax_destroy(struct action_data *data) ...@@ -3429,15 +3441,16 @@ static void onmax_destroy(struct action_data *data)
kfree(data); kfree(data);
} }
static int action_create(struct hist_trigger_data *hist_data,
struct action_data *data);
static int onmax_create(struct hist_trigger_data *hist_data, static int onmax_create(struct hist_trigger_data *hist_data,
struct action_data *data) struct action_data *data)
{ {
struct hist_field *var_field, *ref_field, *max_var = NULL;
struct trace_event_file *file = hist_data->event_file; struct trace_event_file *file = hist_data->event_file;
struct hist_field *var_field, *ref_field, *max_var;
unsigned int var_ref_idx = hist_data->n_var_refs; unsigned int var_ref_idx = hist_data->n_var_refs;
struct field_var *field_var; char *onmax_var_str;
char *onmax_var_str, *param;
unsigned int i;
int ret = 0; int ret = 0;
onmax_var_str = data->onmax.var_str; onmax_var_str = data->onmax.var_str;
...@@ -3459,8 +3472,8 @@ static int onmax_create(struct hist_trigger_data *hist_data, ...@@ -3459,8 +3472,8 @@ static int onmax_create(struct hist_trigger_data *hist_data,
data->onmax.var = ref_field; data->onmax.var = ref_field;
data->fn = onmax_save;
data->onmax.max_var_ref_idx = var_ref_idx; data->onmax.max_var_ref_idx = var_ref_idx;
max_var = create_var(hist_data, file, "max", sizeof(u64), "u64"); max_var = create_var(hist_data, file, "max", sizeof(u64), "u64");
if (IS_ERR(max_var)) { if (IS_ERR(max_var)) {
hist_err("onmax: Couldn't create onmax variable: ", "max"); hist_err("onmax: Couldn't create onmax variable: ", "max");
...@@ -3469,27 +3482,7 @@ static int onmax_create(struct hist_trigger_data *hist_data, ...@@ -3469,27 +3482,7 @@ static int onmax_create(struct hist_trigger_data *hist_data,
} }
data->onmax.max_var = max_var; data->onmax.max_var = max_var;
for (i = 0; i < data->n_params; i++) { ret = action_create(hist_data, data);
param = kstrdup(data->params[i], GFP_KERNEL);
if (!param) {
ret = -ENOMEM;
goto out;
}
field_var = create_target_field_var(hist_data, NULL, NULL, param);
if (IS_ERR(field_var)) {
hist_err("onmax: Couldn't create field variable: ", param);
ret = PTR_ERR(field_var);
kfree(param);
goto out;
}
hist_data->max_vars[hist_data->n_max_vars++] = field_var;
if (field_var->val->flags & HIST_FIELD_FL_STRING)
hist_data->n_max_var_str++;
kfree(param);
}
out: out:
return ret; return ret;
} }
...@@ -3500,11 +3493,14 @@ static int parse_action_params(char *params, struct action_data *data) ...@@ -3500,11 +3493,14 @@ static int parse_action_params(char *params, struct action_data *data)
int ret = 0; int ret = 0;
while (params) { while (params) {
if (data->n_params >= SYNTH_FIELDS_MAX) if (data->n_params >= SYNTH_FIELDS_MAX) {
hist_err("Too many action params", "");
goto out; goto out;
}
param = strsep(&params, ","); param = strsep(&params, ",");
if (!param) { if (!param) {
hist_err("No action param found", "");
ret = -EINVAL; ret = -EINVAL;
goto out; goto out;
} }
...@@ -3528,10 +3524,71 @@ static int parse_action_params(char *params, struct action_data *data) ...@@ -3528,10 +3524,71 @@ static int parse_action_params(char *params, struct action_data *data)
return ret; return ret;
} }
static struct action_data *onmax_parse(char *str) static int action_parse(char *str, struct action_data *data,
enum handler_id handler)
{
char *action_name;
int ret = 0;
strsep(&str, ".");
if (!str) {
hist_err("action parsing: No action found", "");
ret = -EINVAL;
goto out;
}
action_name = strsep(&str, "(");
if (!action_name || !str) {
hist_err("action parsing: No action found", "");
ret = -EINVAL;
goto out;
}
if (str_has_prefix(action_name, "save")) {
char *params = strsep(&str, ")");
if (!params) {
hist_err("action parsing: No params found for %s", "save");
ret = -EINVAL;
goto out;
}
ret = parse_action_params(params, data);
if (ret)
goto out;
if (handler == HANDLER_ONMAX)
data->fn = onmax_save;
data->action = ACTION_SAVE;
} else {
char *params = strsep(&str, ")");
if (params) {
ret = parse_action_params(params, data);
if (ret)
goto out;
}
data->fn = action_trace;
data->action = ACTION_TRACE;
}
data->action_name = kstrdup(action_name, GFP_KERNEL);
if (!data->action_name) {
ret = -ENOMEM;
goto out;
}
data->handler = handler;
out:
return ret;
}
static struct action_data *onmax_parse(char *str, enum handler_id handler)
{ {
char *onmax_fn_name, *onmax_var_str;
struct action_data *data; struct action_data *data;
char *onmax_var_str;
int ret = -EINVAL; int ret = -EINVAL;
data = kzalloc(sizeof(*data), GFP_KERNEL); data = kzalloc(sizeof(*data), GFP_KERNEL);
...@@ -3550,33 +3607,9 @@ static struct action_data *onmax_parse(char *str) ...@@ -3550,33 +3607,9 @@ static struct action_data *onmax_parse(char *str)
goto free; goto free;
} }
strsep(&str, "."); ret = action_parse(str, data, handler);
if (!str)
goto free;
onmax_fn_name = strsep(&str, "(");
if (!onmax_fn_name || !str)
goto free;
if (str_has_prefix(onmax_fn_name, "save")) {
char *params = strsep(&str, ")");
if (!params) {
ret = -EINVAL;
goto free;
}
ret = parse_action_params(params, data);
if (ret) if (ret)
goto free; goto free;
} else
goto free;
data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL);
if (!data->onmax.fn_name) {
ret = -ENOMEM;
goto free;
}
out: out:
return data; return data;
free: free:
...@@ -3593,7 +3626,7 @@ static void onmatch_destroy(struct action_data *data) ...@@ -3593,7 +3626,7 @@ static void onmatch_destroy(struct action_data *data)
kfree(data->onmatch.match_event); kfree(data->onmatch.match_event);
kfree(data->onmatch.match_event_system); kfree(data->onmatch.match_event_system);
kfree(data->onmatch.synth_event_name); kfree(data->action_name);
for (i = 0; i < data->n_params; i++) for (i = 0; i < data->n_params; i++)
kfree(data->params[i]); kfree(data->params[i]);
...@@ -3651,7 +3684,8 @@ static int check_synth_field(struct synth_event *event, ...@@ -3651,7 +3684,8 @@ static int check_synth_field(struct synth_event *event,
} }
static struct hist_field * static struct hist_field *
onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, trace_action_find_var(struct hist_trigger_data *hist_data,
struct action_data *data,
char *system, char *event, char *var) char *system, char *event, char *var)
{ {
struct hist_field *hist_field; struct hist_field *hist_field;
...@@ -3660,7 +3694,7 @@ onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, ...@@ -3660,7 +3694,7 @@ onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
hist_field = find_target_event_var(hist_data, system, event, var); hist_field = find_target_event_var(hist_data, system, event, var);
if (!hist_field) { if (!hist_field) {
if (!system) { if (!system && data->handler == HANDLER_ONMATCH) {
system = data->onmatch.match_event_system; system = data->onmatch.match_event_system;
event = data->onmatch.match_event; event = data->onmatch.match_event;
} }
...@@ -3669,13 +3703,13 @@ onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data, ...@@ -3669,13 +3703,13 @@ onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
} }
if (!hist_field) if (!hist_field)
hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var); hist_err_event("trace action: Couldn't find param: $", system, event, var);
return hist_field; return hist_field;
} }
static struct hist_field * static struct hist_field *
onmatch_create_field_var(struct hist_trigger_data *hist_data, trace_action_create_field_var(struct hist_trigger_data *hist_data,
struct action_data *data, char *system, struct action_data *data, char *system,
char *event, char *var) char *event, char *var)
{ {
...@@ -3700,7 +3734,7 @@ onmatch_create_field_var(struct hist_trigger_data *hist_data, ...@@ -3700,7 +3734,7 @@ onmatch_create_field_var(struct hist_trigger_data *hist_data,
* looking for fields on the onmatch(system.event.xxx) * looking for fields on the onmatch(system.event.xxx)
* event. * event.
*/ */
if (!system) { if (!system && data->handler == HANDLER_ONMATCH) {
system = data->onmatch.match_event_system; system = data->onmatch.match_event_system;
event = data->onmatch.match_event; event = data->onmatch.match_event;
} }
...@@ -3724,8 +3758,7 @@ onmatch_create_field_var(struct hist_trigger_data *hist_data, ...@@ -3724,8 +3758,7 @@ onmatch_create_field_var(struct hist_trigger_data *hist_data,
goto out; goto out;
} }
static int onmatch_create(struct hist_trigger_data *hist_data, static int trace_action_create(struct hist_trigger_data *hist_data,
struct trace_event_file *file,
struct action_data *data) struct action_data *data)
{ {
char *event_name, *param, *system = NULL; char *event_name, *param, *system = NULL;
...@@ -3737,11 +3770,12 @@ static int onmatch_create(struct hist_trigger_data *hist_data, ...@@ -3737,11 +3770,12 @@ static int onmatch_create(struct hist_trigger_data *hist_data,
lockdep_assert_held(&event_mutex); lockdep_assert_held(&event_mutex);
event = find_synth_event(data->onmatch.synth_event_name); event = find_synth_event(data->action_name);
if (!event) { if (!event) {
hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name); hist_err("trace action: Couldn't find synthetic event: ", data->action_name);
return -EINVAL; return -EINVAL;
} }
event->ref++; event->ref++;
var_ref_idx = hist_data->n_var_refs; var_ref_idx = hist_data->n_var_refs;
...@@ -3769,10 +3803,12 @@ static int onmatch_create(struct hist_trigger_data *hist_data, ...@@ -3769,10 +3803,12 @@ static int onmatch_create(struct hist_trigger_data *hist_data,
} }
if (param[0] == '$') if (param[0] == '$')
hist_field = onmatch_find_var(hist_data, data, system, hist_field = trace_action_find_var(hist_data, data,
event_name, param); system, event_name,
param);
else else
hist_field = onmatch_create_field_var(hist_data, data, hist_field = trace_action_create_field_var(hist_data,
data,
system, system,
event_name, event_name,
param); param);
...@@ -3797,7 +3833,7 @@ static int onmatch_create(struct hist_trigger_data *hist_data, ...@@ -3797,7 +3833,7 @@ static int onmatch_create(struct hist_trigger_data *hist_data,
continue; continue;
} }
hist_err_event("onmatch: Param type doesn't match synthetic event field type: ", hist_err_event("trace action: Param type doesn't match synthetic event field type: ",
system, event_name, param); system, event_name, param);
kfree(p); kfree(p);
ret = -EINVAL; ret = -EINVAL;
...@@ -3805,12 +3841,11 @@ static int onmatch_create(struct hist_trigger_data *hist_data, ...@@ -3805,12 +3841,11 @@ static int onmatch_create(struct hist_trigger_data *hist_data,
} }
if (field_pos != event->n_fields) { if (field_pos != event->n_fields) {
hist_err("onmatch: Param count doesn't match synthetic event field count: ", event->name); hist_err("trace action: Param count doesn't match synthetic event field count: ", event->name);
ret = -EINVAL; ret = -EINVAL;
goto err; goto err;
} }
data->fn = action_trace;
data->onmatch.synth_event = event; data->onmatch.synth_event = event;
data->onmatch.var_ref_idx = var_ref_idx; data->onmatch.var_ref_idx = var_ref_idx;
out: out:
...@@ -3821,10 +3856,58 @@ static int onmatch_create(struct hist_trigger_data *hist_data, ...@@ -3821,10 +3856,58 @@ static int onmatch_create(struct hist_trigger_data *hist_data,
goto out; goto out;
} }
static int action_create(struct hist_trigger_data *hist_data,
struct action_data *data)
{
struct field_var *field_var;
unsigned int i;
char *param;
int ret = 0;
if (data->action == ACTION_TRACE)
return trace_action_create(hist_data, data);
if (data->action == ACTION_SAVE) {
if (hist_data->n_save_vars) {
ret = -EEXIST;
hist_err("save action: Can't have more than one save() action per hist", "");
goto out;
}
for (i = 0; i < data->n_params; i++) {
param = kstrdup(data->params[i], GFP_KERNEL);
if (!param) {
ret = -ENOMEM;
goto out;
}
field_var = create_target_field_var(hist_data, NULL, NULL, param);
if (IS_ERR(field_var)) {
hist_err("save action: Couldn't create field variable: ", param);
ret = PTR_ERR(field_var);
kfree(param);
goto out;
}
hist_data->save_vars[hist_data->n_save_vars++] = field_var;
if (field_var->val->flags & HIST_FIELD_FL_STRING)
hist_data->n_save_var_str++;
kfree(param);
}
}
out:
return ret;
}
static int onmatch_create(struct hist_trigger_data *hist_data,
struct action_data *data)
{
return action_create(hist_data, data);
}
static struct action_data *onmatch_parse(struct trace_array *tr, char *str) static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
{ {
char *match_event, *match_event_system; char *match_event, *match_event_system;
char *synth_event_name, *params;
struct action_data *data; struct action_data *data;
int ret = -EINVAL; int ret = -EINVAL;
...@@ -3862,31 +3945,7 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str) ...@@ -3862,31 +3945,7 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
goto free; goto free;
} }
strsep(&str, "."); ret = action_parse(str, data, HANDLER_ONMATCH);
if (!str) {
hist_err("onmatch: Missing . after onmatch(): ", str);
goto free;
}
synth_event_name = strsep(&str, "(");
if (!synth_event_name || !str) {
hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name);
goto free;
}
data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL);
if (!data->onmatch.synth_event_name) {
ret = -ENOMEM;
goto free;
}
params = strsep(&str, ")");
if (!params || !str || (str && strlen(str))) {
hist_err("onmatch: Missing closing paramlist paren: ", params);
goto free;
}
ret = parse_action_params(params, data);
if (ret) if (ret)
goto free; goto free;
out: out:
...@@ -4326,9 +4385,9 @@ static void destroy_actions(struct hist_trigger_data *hist_data) ...@@ -4326,9 +4385,9 @@ static void destroy_actions(struct hist_trigger_data *hist_data)
for (i = 0; i < hist_data->n_actions; i++) { for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i]; struct action_data *data = hist_data->actions[i];
if (data->fn == action_trace) if (data->handler == HANDLER_ONMATCH)
onmatch_destroy(data); onmatch_destroy(data);
else if (data->fn == onmax_save) else if (data->handler == HANDLER_ONMAX)
onmax_destroy(data); onmax_destroy(data);
else else
kfree(data); kfree(data);
...@@ -4355,16 +4414,14 @@ static int parse_actions(struct hist_trigger_data *hist_data) ...@@ -4355,16 +4414,14 @@ static int parse_actions(struct hist_trigger_data *hist_data)
ret = PTR_ERR(data); ret = PTR_ERR(data);
break; break;
} }
data->fn = action_trace;
} else if ((len = str_has_prefix(str, "onmax("))) { } else if ((len = str_has_prefix(str, "onmax("))) {
char *action_str = str + len; char *action_str = str + len;
data = onmax_parse(action_str); data = onmax_parse(action_str, HANDLER_ONMAX);
if (IS_ERR(data)) { if (IS_ERR(data)) {
ret = PTR_ERR(data); ret = PTR_ERR(data);
break; break;
} }
data->fn = onmax_save;
} else { } else {
ret = -EINVAL; ret = -EINVAL;
break; break;
...@@ -4376,8 +4433,7 @@ static int parse_actions(struct hist_trigger_data *hist_data) ...@@ -4376,8 +4433,7 @@ static int parse_actions(struct hist_trigger_data *hist_data)
return ret; return ret;
} }
static int create_actions(struct hist_trigger_data *hist_data, static int create_actions(struct hist_trigger_data *hist_data)
struct trace_event_file *file)
{ {
struct action_data *data; struct action_data *data;
unsigned int i; unsigned int i;
...@@ -4386,14 +4442,17 @@ static int create_actions(struct hist_trigger_data *hist_data, ...@@ -4386,14 +4442,17 @@ static int create_actions(struct hist_trigger_data *hist_data,
for (i = 0; i < hist_data->attrs->n_actions; i++) { for (i = 0; i < hist_data->attrs->n_actions; i++) {
data = hist_data->actions[i]; data = hist_data->actions[i];
if (data->fn == action_trace) { if (data->handler == HANDLER_ONMATCH) {
ret = onmatch_create(hist_data, file, data); ret = onmatch_create(hist_data, data);
if (ret) if (ret)
return ret; break;
} else if (data->fn == onmax_save) { } else if (data->handler == HANDLER_ONMAX) {
ret = onmax_create(hist_data, data); ret = onmax_create(hist_data, data);
if (ret) if (ret)
return ret; break;
} else {
ret = -EINVAL;
break;
} }
} }
...@@ -4409,26 +4468,42 @@ static void print_actions(struct seq_file *m, ...@@ -4409,26 +4468,42 @@ static void print_actions(struct seq_file *m,
for (i = 0; i < hist_data->n_actions; i++) { for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i]; struct action_data *data = hist_data->actions[i];
if (data->fn == onmax_save) if (data->handler == HANDLER_ONMAX)
onmax_print(m, hist_data, elt, data); onmax_print(m, hist_data, elt, data);
} }
} }
static void print_onmax_spec(struct seq_file *m, static void print_action_spec(struct seq_file *m,
struct hist_trigger_data *hist_data, struct hist_trigger_data *hist_data,
struct action_data *data) struct action_data *data)
{ {
unsigned int i; unsigned int i;
if (data->action == ACTION_SAVE) {
for (i = 0; i < hist_data->n_save_vars; i++) {
seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
if (i < hist_data->n_save_vars - 1)
seq_puts(m, ",");
}
} else if (data->action == ACTION_TRACE) {
for (i = 0; i < data->n_params; i++) {
if (i)
seq_puts(m, ",");
seq_printf(m, "%s", data->params[i]);
}
}
}
static void print_onmax_spec(struct seq_file *m,
struct hist_trigger_data *hist_data,
struct action_data *data)
{
seq_puts(m, ":onmax("); seq_puts(m, ":onmax(");
seq_printf(m, "%s", data->onmax.var_str); seq_printf(m, "%s", data->onmax.var_str);
seq_printf(m, ").%s(", data->onmax.fn_name); seq_printf(m, ").%s(", data->action_name);
print_action_spec(m, hist_data, data);
for (i = 0; i < hist_data->n_max_vars; i++) {
seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name);
if (i < hist_data->n_max_vars - 1)
seq_puts(m, ",");
}
seq_puts(m, ")"); seq_puts(m, ")");
} }
...@@ -4436,18 +4511,12 @@ static void print_onmatch_spec(struct seq_file *m, ...@@ -4436,18 +4511,12 @@ static void print_onmatch_spec(struct seq_file *m,
struct hist_trigger_data *hist_data, struct hist_trigger_data *hist_data,
struct action_data *data) struct action_data *data)
{ {
unsigned int i;
seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system, seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system,
data->onmatch.match_event); data->onmatch.match_event);
seq_printf(m, "%s(", data->onmatch.synth_event->name); seq_printf(m, "%s(", data->action_name);
for (i = 0; i < data->n_params; i++) { print_action_spec(m, hist_data, data);
if (i)
seq_puts(m, ",");
seq_printf(m, "%s", data->params[i]);
}
seq_puts(m, ")"); seq_puts(m, ")");
} }
...@@ -4464,7 +4533,9 @@ static bool actions_match(struct hist_trigger_data *hist_data, ...@@ -4464,7 +4533,9 @@ static bool actions_match(struct hist_trigger_data *hist_data,
struct action_data *data = hist_data->actions[i]; struct action_data *data = hist_data->actions[i];
struct action_data *data_test = hist_data_test->actions[i]; struct action_data *data_test = hist_data_test->actions[i];
if (data->fn != data_test->fn) if (data->handler != data_test->handler)
return false;
if (data->action != data_test->action)
return false; return false;
if (data->n_params != data_test->n_params) if (data->n_params != data_test->n_params)
...@@ -4475,23 +4546,20 @@ static bool actions_match(struct hist_trigger_data *hist_data, ...@@ -4475,23 +4546,20 @@ static bool actions_match(struct hist_trigger_data *hist_data,
return false; return false;
} }
if (data->fn == action_trace) { if (strcmp(data->action_name, data_test->action_name) != 0)
if (strcmp(data->onmatch.synth_event_name,
data_test->onmatch.synth_event_name) != 0)
return false; return false;
if (data->handler == HANDLER_ONMATCH) {
if (strcmp(data->onmatch.match_event_system, if (strcmp(data->onmatch.match_event_system,
data_test->onmatch.match_event_system) != 0) data_test->onmatch.match_event_system) != 0)
return false; return false;
if (strcmp(data->onmatch.match_event, if (strcmp(data->onmatch.match_event,
data_test->onmatch.match_event) != 0) data_test->onmatch.match_event) != 0)
return false; return false;
} else if (data->fn == onmax_save) { } else if (data->handler == HANDLER_ONMAX) {
if (strcmp(data->onmax.var_str, if (strcmp(data->onmax.var_str,
data_test->onmax.var_str) != 0) data_test->onmax.var_str) != 0)
return false; return false;
if (strcmp(data->onmax.fn_name,
data_test->onmax.fn_name) != 0)
return false;
} }
} }
...@@ -4507,9 +4575,9 @@ static void print_actions_spec(struct seq_file *m, ...@@ -4507,9 +4575,9 @@ static void print_actions_spec(struct seq_file *m,
for (i = 0; i < hist_data->n_actions; i++) { for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i]; struct action_data *data = hist_data->actions[i];
if (data->fn == action_trace) if (data->handler == HANDLER_ONMATCH)
print_onmatch_spec(m, hist_data, data); print_onmatch_spec(m, hist_data, data);
else if (data->fn == onmax_save) else if (data->handler == HANDLER_ONMAX)
print_onmax_spec(m, hist_data, data); print_onmax_spec(m, hist_data, data);
} }
} }
...@@ -4703,14 +4771,15 @@ static inline void add_to_key(char *compound_key, void *key, ...@@ -4703,14 +4771,15 @@ static inline void add_to_key(char *compound_key, void *key,
static void static void
hist_trigger_actions(struct hist_trigger_data *hist_data, hist_trigger_actions(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, u64 *var_ref_vals) struct ring_buffer_event *rbe, void *key,
u64 *var_ref_vals)
{ {
struct action_data *data; struct action_data *data;
unsigned int i; unsigned int i;
for (i = 0; i < hist_data->n_actions; i++) { for (i = 0; i < hist_data->n_actions; i++) {
data = hist_data->actions[i]; data = hist_data->actions[i];
data->fn(hist_data, elt, rec, rbe, data, var_ref_vals); data->fn(hist_data, elt, rec, rbe, key, data, var_ref_vals);
} }
} }
...@@ -4771,7 +4840,7 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec, ...@@ -4771,7 +4840,7 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec,
hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals); hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
if (resolve_var_refs(hist_data, key, var_ref_vals, true)) if (resolve_var_refs(hist_data, key, var_ref_vals, true))
hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals); hist_trigger_actions(hist_data, elt, rec, rbe, key, var_ref_vals);
} }
static void hist_trigger_stacktrace_print(struct seq_file *m, static void hist_trigger_stacktrace_print(struct seq_file *m,
...@@ -5683,7 +5752,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops, ...@@ -5683,7 +5752,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
if (has_hist_vars(hist_data)) if (has_hist_vars(hist_data))
save_hist_vars(hist_data); save_hist_vars(hist_data);
ret = create_actions(hist_data, file); ret = create_actions(hist_data);
if (ret) if (ret)
goto out_unreg; goto out_unreg;
......
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