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Message-Id: <2b451d62e0b1a12fc99391dfdda9be2d8e9ca499.1637700535.git.zanussi@kernel.org>
Date: Tue, 23 Nov 2021 14:53:54 -0600
From: Tom Zanussi <zanussi@...nel.org>
To: rostedt@...dmis.org
Cc: mhiramat@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] tracing: Have existing event_command implementations use helpers
Simplify the existing event_command implementations by making use of
the helper functions previously introduced.
Signed-off-by: Tom Zanussi <zanussi@...nel.org>
---
kernel/trace/trace_events_hist.c | 51 +++------
kernel/trace/trace_events_trigger.c | 159 +++++++---------------------
2 files changed, 55 insertions(+), 155 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 8ff572a31fd3..b7dbbafbe8c7 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -6128,10 +6128,11 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
struct hist_trigger_attrs *attrs;
struct event_trigger_ops *trigger_ops;
struct hist_trigger_data *hist_data;
+ char *trigger, *p, *start;
struct synth_event *se;
const char *se_name;
- bool remove = false;
- char *trigger, *p, *start;
+ int n_registered;
+ bool remove;
int ret = 0;
lockdep_assert_held(&event_mutex);
@@ -6141,11 +6142,10 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
last_cmd_set(file, param);
}
- if (!param)
- return -EINVAL;
+ remove = event_trigger_check_remove(glob);
- if (glob[0] == '!')
- remove = true;
+ if (event_trigger_empty_param(param))
+ return -EINVAL;
/*
* separate the trigger from the filter (k:v [if filter])
@@ -6202,29 +6202,15 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
return PTR_ERR(hist_data);
}
- trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
-
- trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
+ trigger_data = event_trigger_alloc(cmd_ops, cmd, trigger, hist_data);
if (!trigger_data) {
ret = -ENOMEM;
goto out_free;
}
- trigger_data->count = -1;
- trigger_data->ops = trigger_ops;
- trigger_data->cmd_ops = cmd_ops;
-
- INIT_LIST_HEAD(&trigger_data->list);
- RCU_INIT_POINTER(trigger_data->filter, NULL);
-
- trigger_data->private_data = hist_data;
-
- /* if param is non-empty, it's supposed to be a filter */
- if (param && cmd_ops->set_filter) {
- ret = cmd_ops->set_filter(param, trigger_data, file);
- if (ret < 0)
- goto out_free;
- }
+ ret = event_trigger_set_filter(cmd_ops, file, param, trigger_data);
+ if (ret < 0)
+ goto out_free;
if (remove) {
if (!have_hist_trigger_match(trigger_data, file))
@@ -6244,18 +6230,14 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
goto out_free;
}
- ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
- /*
- * The above returns on success the # of triggers registered,
- * but if it didn't register any it returns zero. Consider no
- * triggers registered a failure too.
- */
- if (!ret) {
+ ret = event_trigger_register(cmd_ops, file, glob, cmd, trigger, trigger_data, &n_registered);
+ if (ret)
+ goto out_free;
+ if ((ret == 0) && (n_registered == 0)) {
if (!(attrs->pause || attrs->cont || attrs->clear))
ret = -ENOENT;
goto out_free;
- } else if (ret < 0)
- goto out_free;
+ }
if (get_named_trigger_data(trigger_data))
goto enable;
@@ -6289,8 +6271,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
out_unreg:
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
out_free:
- if (cmd_ops->set_filter)
- cmd_ops->set_filter(NULL, trigger_data, NULL);
+ event_trigger_reset_filter(cmd_ops, trigger_data);
remove_hist_vars(hist_data);
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index a873f4e8be04..1d1716d5bee2 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -931,89 +931,47 @@ event_trigger_callback(struct event_command *cmd_ops,
struct event_trigger_data *trigger_data;
struct event_trigger_ops *trigger_ops;
char *trigger = NULL;
- char *number;
+ bool remove;
int ret;
- /* separate the trigger from the filter (t:n [if filter]) */
- if (param && isdigit(param[0])) {
- trigger = strsep(¶m, " \t");
- if (param) {
- param = skip_spaces(param);
- if (!*param)
- param = NULL;
- }
- }
+ remove = event_trigger_check_remove(glob);
- trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
+ ret = event_trigger_separate_filter(&trigger, ¶m, false);
+ if (ret)
+ return ret;
ret = -ENOMEM;
- trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
+ trigger_data = event_trigger_alloc(cmd_ops, cmd, trigger, file);
if (!trigger_data)
goto out;
- trigger_data->count = -1;
- trigger_data->ops = trigger_ops;
- trigger_data->cmd_ops = cmd_ops;
- trigger_data->private_data = file;
- INIT_LIST_HEAD(&trigger_data->list);
- INIT_LIST_HEAD(&trigger_data->named_list);
-
- if (glob[0] == '!') {
+ if (remove) {
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
- kfree(trigger_data);
ret = 0;
goto out;
}
- if (trigger) {
- number = strsep(&trigger, ":");
-
- ret = -EINVAL;
- if (!strlen(number))
- goto out_free;
-
- /*
- * We use the callback data field (which is a pointer)
- * as our counter.
- */
- ret = kstrtoul(number, 0, &trigger_data->count);
- if (ret)
- goto out_free;
- }
-
- if (!param) /* if param is non-empty, it's supposed to be a filter */
- goto out_reg;
-
- if (!cmd_ops->set_filter)
- goto out_reg;
+ ret = event_trigger_parse_num(trigger, trigger_data);
+ if (ret)
+ goto out_free;
- ret = cmd_ops->set_filter(param, trigger_data, file);
+ ret = event_trigger_set_filter(cmd_ops, file, param, trigger_data);
if (ret < 0)
goto out_free;
- out_reg:
/* Up the trigger_data count to make sure reg doesn't free it on failure */
event_trigger_init(trigger_ops, trigger_data);
- ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
- /*
- * The above returns on success the # of functions enabled,
- * but if it didn't find any functions it returns zero.
- * Consider no functions a failure too.
- */
- if (!ret) {
- cmd_ops->unreg(glob, trigger_ops, trigger_data, file);
- ret = -ENOENT;
- } else if (ret > 0)
- ret = 0;
+
+ ret = event_trigger_register(cmd_ops, file, glob, cmd, trigger, trigger_data, NULL);
+ if (ret)
+ goto out_free;
/* Down the counter of trigger_data or free it if not used anymore */
event_trigger_free(trigger_ops, trigger_data);
out:
return ret;
-
out_free:
- if (cmd_ops->set_filter)
- cmd_ops->set_filter(NULL, trigger_data, NULL);
+ event_trigger_reset_filter(cmd_ops, trigger_data);
kfree(trigger_data);
goto out;
}
@@ -1675,26 +1633,21 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
struct event_trigger_data *trigger_data;
struct event_trigger_ops *trigger_ops;
struct trace_array *tr = file->tr;
+ bool enable, remove;
const char *system;
const char *event;
bool hist = false;
char *trigger;
- char *number;
- bool enable;
int ret;
- if (!param)
- return -EINVAL;
+ remove = event_trigger_check_remove(glob);
- /* separate the trigger from the filter (s:e:n [if filter]) */
- trigger = strsep(¶m, " \t");
- if (!trigger)
+ if (event_trigger_empty_param(param))
return -EINVAL;
- if (param) {
- param = skip_spaces(param);
- if (!*param)
- param = NULL;
- }
+
+ ret = event_trigger_separate_filter(&trigger, ¶m, true);
+ if (ret)
+ return ret;
system = strsep(&trigger, ":");
if (!trigger)
@@ -1719,28 +1672,23 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
ret = -ENOMEM;
- trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
- if (!trigger_data)
- goto out;
-
enable_data = kzalloc(sizeof(*enable_data), GFP_KERNEL);
if (!enable_data) {
kfree(trigger_data);
goto out;
}
- trigger_data->count = -1;
- trigger_data->ops = trigger_ops;
- trigger_data->cmd_ops = cmd_ops;
- INIT_LIST_HEAD(&trigger_data->list);
- RCU_INIT_POINTER(trigger_data->filter, NULL);
-
enable_data->hist = hist;
enable_data->enable = enable;
enable_data->file = event_enable_file;
- trigger_data->private_data = enable_data;
- if (glob[0] == '!') {
+ trigger_data = event_trigger_alloc(cmd_ops, cmd, trigger, enable_data);
+ if (!trigger_data) {
+ kfree(enable_data);
+ goto out;
+ }
+
+ if (remove) {
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
kfree(trigger_data);
kfree(enable_data);
@@ -1751,33 +1699,14 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
/* Up the trigger_data count to make sure nothing frees it on failure */
event_trigger_init(trigger_ops, trigger_data);
- if (trigger) {
- number = strsep(&trigger, ":");
-
- ret = -EINVAL;
- if (!strlen(number))
- goto out_free;
-
- /*
- * We use the callback data field (which is a pointer)
- * as our counter.
- */
- ret = kstrtoul(number, 0, &trigger_data->count);
- if (ret)
- goto out_free;
- }
-
- if (!param) /* if param is non-empty, it's supposed to be a filter */
- goto out_reg;
-
- if (!cmd_ops->set_filter)
- goto out_reg;
+ ret = event_trigger_parse_num(trigger, trigger_data);
+ if (ret)
+ goto out_free;
- ret = cmd_ops->set_filter(param, trigger_data, file);
+ ret = event_trigger_set_filter(cmd_ops, file, param, trigger_data);
if (ret < 0)
goto out_free;
- out_reg:
/* Don't let event modules unload while probe registered */
ret = trace_event_try_get_ref(event_enable_file->event_call);
if (!ret) {
@@ -1788,30 +1717,20 @@ int event_enable_trigger_func(struct event_command *cmd_ops,
ret = trace_event_enable_disable(event_enable_file, 1, 1);
if (ret < 0)
goto out_put;
- ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
- /*
- * The above returns on success the # of functions enabled,
- * but if it didn't find any functions it returns zero.
- * Consider no functions a failure too.
- */
- if (!ret) {
- ret = -ENOENT;
- goto out_disable;
- } else if (ret < 0)
+
+ ret = event_trigger_register(cmd_ops, file, glob, cmd, trigger, trigger_data, NULL);
+ if (ret)
goto out_disable;
- /* Just return zero, not the number of enabled functions */
- ret = 0;
+
event_trigger_free(trigger_ops, trigger_data);
out:
return ret;
-
out_disable:
trace_event_enable_disable(event_enable_file, 0, 1);
out_put:
trace_event_put_ref(event_enable_file->event_call);
out_free:
- if (cmd_ops->set_filter)
- cmd_ops->set_filter(NULL, trigger_data, NULL);
+ event_trigger_reset_filter(cmd_ops, trigger_data);
event_trigger_free(trigger_ops, trigger_data);
kfree(enable_data);
goto out;
--
2.17.1
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