* [for-next][PATCH 01/19] ring-buffer: Fix ring buffer size in rb_write_something()
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 03/19] tracing: Add tracing error log Steven Rostedt
` (16 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, YueHaibing
From: YueHaibing <yuehaibing@huawei.com>
'cnt' should be used to calculate ring buffer size rather than data->cnt
Link: http://lkml.kernel.org/r/1537704693-184237-1-git-send-email-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/ring_buffer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 41b6f96e5366..4f33d7d841af 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -4979,7 +4979,7 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested)
cnt = data->cnt + (nested ? 27 : 0);
/* Multiply cnt by ~e, to make some unique increment */
- size = (data->cnt * 68 / 25) % (sizeof(rb_string) - 1);
+ size = (cnt * 68 / 25) % (sizeof(rb_string) - 1);
len = size + sizeof(struct rb_item);
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 03/19] tracing: Add tracing error log
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 01/19] ring-buffer: Fix ring buffer size in rb_write_something() Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 04/19] tracing: Save the last hist commands associated event name Steven Rostedt
` (15 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Introduce a new ftrace file, tracing/error_log, for ftrace commands to
log errors. This is useful for allowing more complex commands such as
hist trigger and kprobe_event commands to point out specifically where
something may have gone wrong without forcing them to resort to more
ad hoc methods such as tacking error messages onto existing output
files.
To log a tracing error, call the event_log_err() function, passing it
a location string describing where it came from e.g. kprobe_events or
system:event, the command that caused the error, an array of static
error strings describing errors and an index within that array which
describes the specific error, along with the position to place the
error caret.
Reading the log displays the last (currently) 8 errors logged in the
following format:
[timestamp] <loc>: error: <static error text>
Command: <command that caused the error>
^
Memory for the error log isn't allocated unless there has been a trace
event error, and the error log can be cleared and have its memory
freed by writing the empty string in truncation mode to it:
# echo > tracing/error_log.
Link: http://lkml.kernel.org/r/0c2c82571fd38c5f3a88ca823627edff250e9416.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Suggested-by: Masami Hiramatsu <mhiramat@kernel.org>
Improvements-suggested-by: Steve Rostedt <rostedt@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace.c | 218 +++++++++++++++++++++++++++++++++++++++++++
kernel/trace/trace.h | 4 +
2 files changed, 222 insertions(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4384fcc386c8..7978168f5041 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6878,6 +6878,221 @@ static const struct file_operations snapshot_raw_fops = {
#endif /* CONFIG_TRACER_SNAPSHOT */
+#define TRACING_LOG_ERRS_MAX 8
+#define TRACING_LOG_LOC_MAX 128
+
+#define CMD_PREFIX " Command: "
+
+struct err_info {
+ const char **errs; /* ptr to loc-specific array of err strings */
+ u8 type; /* index into errs -> specific err string */
+ u8 pos; /* MAX_FILTER_STR_VAL = 256 */
+ u64 ts;
+};
+
+struct tracing_log_err {
+ struct list_head list;
+ struct err_info info;
+ char loc[TRACING_LOG_LOC_MAX]; /* err location */
+ char cmd[MAX_FILTER_STR_VAL]; /* what caused err */
+};
+
+static LIST_HEAD(tracing_err_log);
+static DEFINE_MUTEX(tracing_err_log_lock);
+
+static unsigned int n_tracing_err_log_entries;
+
+struct tracing_log_err *get_tracing_log_err(void)
+{
+ struct tracing_log_err *err;
+
+ if (n_tracing_err_log_entries < TRACING_LOG_ERRS_MAX) {
+ err = kzalloc(sizeof(*err), GFP_KERNEL);
+ if (!err)
+ err = ERR_PTR(-ENOMEM);
+ n_tracing_err_log_entries++;
+
+ return err;
+ }
+
+ err = list_first_entry(&tracing_err_log, struct tracing_log_err, list);
+ list_del(&err->list);
+
+ return err;
+}
+
+/**
+ * err_pos - find the position of a string within a command for error careting
+ * @cmd: The tracing command that caused the error
+ * @str: The string to position the caret at within @cmd
+ *
+ * Finds the position of the first occurence of @str within @cmd. The
+ * return value can be passed to tracing_log_err() for caret placement
+ * within @cmd.
+ *
+ * Returns the index within @cmd of the first occurence of @str or 0
+ * if @str was not found.
+ */
+unsigned int err_pos(char *cmd, const char *str)
+{
+ char *found;
+
+ if (WARN_ON(!strlen(cmd)))
+ return 0;
+
+ found = strstr(cmd, str);
+ if (found)
+ return found - cmd;
+
+ return 0;
+}
+
+/**
+ * tracing_log_err - write an error to the tracing error log
+ * @loc: A string describing where the error occurred
+ * @cmd: The tracing command that caused the error
+ * @errs: The array of loc-specific static error strings
+ * @type: The index into errs[], which produces the specific static err string
+ * @pos: The position the caret should be placed in the cmd
+ *
+ * Writes an error into tracing/error_log of the form:
+ *
+ * <loc>: error: <text>
+ * Command: <cmd>
+ * ^
+ *
+ * tracing/error_log is a small log file containing the last
+ * TRACING_LOG_ERRS_MAX errors (8). Memory for errors isn't allocated
+ * unless there has been a tracing error, and the error log can be
+ * cleared and have its memory freed by writing the empty string in
+ * truncation mode to it i.e. echo > tracing/error_log.
+ *
+ * NOTE: the @errs array along with the @type param are used to
+ * produce a static error string - this string is not copied and saved
+ * when the error is logged - only a pointer to it is saved. See
+ * existing callers for examples of how static strings are typically
+ * defined for use with tracing_log_err().
+ */
+void tracing_log_err(const char *loc, const char *cmd,
+ const char **errs, u8 type, u8 pos)
+{
+ struct tracing_log_err *err;
+
+ mutex_lock(&tracing_err_log_lock);
+ err = get_tracing_log_err();
+ if (PTR_ERR(err) == -ENOMEM) {
+ mutex_unlock(&tracing_err_log_lock);
+ return;
+ }
+
+ snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc);
+ snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd);
+
+ err->info.errs = errs;
+ err->info.type = type;
+ err->info.pos = pos;
+ err->info.ts = local_clock();
+
+ list_add_tail(&err->list, &tracing_err_log);
+ mutex_unlock(&tracing_err_log_lock);
+}
+
+static void clear_tracing_err_log(void)
+{
+ struct tracing_log_err *err, *next;
+
+ mutex_lock(&tracing_err_log_lock);
+ list_for_each_entry_safe(err, next, &tracing_err_log, list) {
+ list_del(&err->list);
+ kfree(err);
+ }
+
+ n_tracing_err_log_entries = 0;
+ mutex_unlock(&tracing_err_log_lock);
+}
+
+static void *tracing_err_log_seq_start(struct seq_file *m, loff_t *pos)
+{
+ mutex_lock(&tracing_err_log_lock);
+
+ return seq_list_start(&tracing_err_log, *pos);
+}
+
+static void *tracing_err_log_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ return seq_list_next(v, &tracing_err_log, pos);
+}
+
+static void tracing_err_log_seq_stop(struct seq_file *m, void *v)
+{
+ mutex_unlock(&tracing_err_log_lock);
+}
+
+static void tracing_err_log_show_pos(struct seq_file *m, u8 pos)
+{
+ u8 i;
+
+ for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++)
+ seq_putc(m, ' ');
+ for (i = 0; i < pos; i++)
+ seq_putc(m, ' ');
+ seq_puts(m, "^\n");
+}
+
+static int tracing_err_log_seq_show(struct seq_file *m, void *v)
+{
+ struct tracing_log_err *err = v;
+
+ if (err) {
+ const char *err_text = err->info.errs[err->info.type];
+ u64 sec = err->info.ts;
+ u32 nsec;
+
+ nsec = do_div(sec, NSEC_PER_SEC);
+ seq_printf(m, "[%5llu.%06u] %s%s", sec, nsec / 1000,
+ err->loc, err_text);
+ seq_printf(m, "%s", err->cmd);
+ tracing_err_log_show_pos(m, err->info.pos);
+ }
+
+ return 0;
+}
+
+static const struct seq_operations tracing_err_log_seq_ops = {
+ .start = tracing_err_log_seq_start,
+ .next = tracing_err_log_seq_next,
+ .stop = tracing_err_log_seq_stop,
+ .show = tracing_err_log_seq_show
+};
+
+static int tracing_err_log_open(struct inode *inode, struct file *file)
+{
+ int ret = 0;
+
+ /* If this file was opened for write, then erase contents */
+ if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC))
+ clear_tracing_err_log();
+
+ if (file->f_mode & FMODE_READ)
+ ret = seq_open(file, &tracing_err_log_seq_ops);
+
+ return ret;
+}
+
+static ssize_t tracing_err_log_write(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ return count;
+}
+
+static const struct file_operations tracing_err_log_fops = {
+ .open = tracing_err_log_open,
+ .write = tracing_err_log_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+};
+
static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
struct trace_array *tr = inode->i_private;
@@ -8284,6 +8499,9 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
tr, &snapshot_fops);
#endif
+ trace_create_file("error_log", 0644, d_tracer,
+ tr, &tracing_err_log_fops);
+
for_each_tracing_cpu(cpu)
tracing_init_tracefs_percpu(tr, cpu);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index d80cee49e0eb..b711edbef7e7 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1884,6 +1884,10 @@ extern ssize_t trace_parse_run_command(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos,
int (*createfn)(int, char**));
+extern unsigned int err_pos(char *cmd, const char *str);
+extern void tracing_log_err(const char *loc, const char *cmd,
+ const char **errs, u8 type, u8 pos);
+
/*
* Normal trace_printk() and friends allocates special buffers
* to do the manipulation, as well as saves the print formats
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 04/19] tracing: Save the last hist commands associated event name
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 01/19] ring-buffer: Fix ring buffer size in rb_write_something() Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 03/19] tracing: Add tracing error log Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 05/19] tracing: Use tracing error_log with hist triggers Steven Rostedt
` (14 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
In preparation for making use of the new trace error log, save the
subsystem and event name associated with the last hist command - it
will be passed as the location param in the event_log_err() calls.
Link: http://lkml.kernel.org/r/eb0fd1362be8f39facb86c83eecf441b7a5876f8.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events_hist.c | 33 ++++++++++++++++++++++++++------
1 file changed, 27 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 795aa2038377..0de702bf148f 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -535,15 +535,34 @@ static struct track_data *track_data_alloc(unsigned int key_len,
return data;
}
-static char last_hist_cmd[MAX_FILTER_STR_VAL];
+static char last_cmd[MAX_FILTER_STR_VAL];
+static char last_cmd_loc[MAX_FILTER_STR_VAL];
+
static char hist_err_str[MAX_FILTER_STR_VAL];
-static void last_cmd_set(char *str)
+static void last_cmd_set(struct trace_event_file *file, char *str)
{
+ const char *system = NULL, *name = NULL;
+ struct trace_event_call *call;
+
if (!str)
return;
- strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1);
+ strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
+
+ if (file) {
+ call = file->event_call;
+
+ system = call->class->system;
+ if (system) {
+ name = trace_event_name(call);
+ if (!name)
+ system = NULL;
+ }
+ }
+
+ if (system)
+ snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
}
static void hist_err(char *str, char *var)
@@ -583,6 +602,8 @@ static void hist_err_event(char *str, char *system, char *event, char *var)
static void hist_err_clear(void)
{
hist_err_str[0] = '\0';
+ last_cmd[0] = '\0';
+ last_cmd_loc[0] = '\0';
}
static bool have_hist_err(void)
@@ -5438,8 +5459,8 @@ static int hist_show(struct seq_file *m, void *v)
}
if (have_hist_err()) {
- seq_printf(m, "\nERROR: %s\n", hist_err_str);
- seq_printf(m, " Last command: %s\n", last_hist_cmd);
+ seq_printf(m, "\n%s: error: \n", hist_err_str);
+ seq_printf(m, " Last command: %s\n", last_cmd);
}
out_unlock:
@@ -6043,8 +6064,8 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
lockdep_assert_held(&event_mutex);
if (glob && strlen(glob)) {
- last_cmd_set(param);
hist_err_clear();
+ last_cmd_set(file, param);
}
if (!param)
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 05/19] tracing: Use tracing error_log with hist triggers
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (2 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 04/19] tracing: Save the last hist commands associated event name Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 06/19] tracing: Use tracing error_log with trace event filters Steven Rostedt
` (13 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Replace hist_err() and hist_err_event() with tracing_log_err() from
the new tracing error_log mechanism.
Also add a couple related helper functions and remove most of the old
hist_err()-related code.
With this change, users no longer read the hist files for hist trigger
error information, but instead look at tracing/error_log for the same
information.
Link: http://lkml.kernel.org/r/c98f77a97c9715d18b623eeb5741057b330d5ac0.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events_hist.c | 206 ++++++++++++++++---------------
1 file changed, 104 insertions(+), 102 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 0de702bf148f..071c62cacba7 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -22,6 +22,57 @@
#define STR_VAR_LEN_MAX 32 /* must be multiple of sizeof(u64) */
+#define ERRORS \
+ C(NONE, "No error"), \
+ C(DUPLICATE_VAR, "Variable already defined"), \
+ C(VAR_NOT_UNIQUE, "Variable name not unique, need to use fully qualified name (subsys.event.var) for variable"), \
+ C(TOO_MANY_VARS, "Too many variables defined"), \
+ C(MALFORMED_ASSIGNMENT, "Malformed assignment"), \
+ C(NAMED_MISMATCH, "Named hist trigger doesn't match existing named trigger (includes variables)"), \
+ C(TRIGGER_EEXIST, "Hist trigger already exists"), \
+ C(TRIGGER_ENOENT_CLEAR, "Can't clear or continue a nonexistent hist trigger"), \
+ C(SET_CLOCK_FAIL, "Couldn't set trace_clock"), \
+ C(BAD_FIELD_MODIFIER, "Invalid field modifier"), \
+ C(TOO_MANY_SUBEXPR, "Too many subexpressions (3 max)"), \
+ C(TIMESTAMP_MISMATCH, "Timestamp units in expression don't match"), \
+ C(TOO_MANY_FIELD_VARS, "Too many field variables defined"), \
+ C(EVENT_FILE_NOT_FOUND, "Event file not found"), \
+ C(HIST_NOT_FOUND, "Matching event histogram not found"), \
+ C(HIST_CREATE_FAIL, "Couldn't create histogram for field"), \
+ C(SYNTH_VAR_NOT_FOUND, "Couldn't find synthetic variable"), \
+ C(SYNTH_EVENT_NOT_FOUND,"Couldn't find synthetic event"), \
+ C(SYNTH_TYPE_MISMATCH, "Param type doesn't match synthetic event field type"), \
+ C(SYNTH_COUNT_MISMATCH, "Param count doesn't match synthetic event field count"), \
+ C(FIELD_VAR_PARSE_FAIL, "Couldn't parse field variable"), \
+ C(VAR_CREATE_FIND_FAIL, "Couldn't create or find variable"), \
+ C(ONX_NOT_VAR, "For onmax(x) or onchange(x), x must be a variable"), \
+ C(ONX_VAR_NOT_FOUND, "Couldn't find onmax or onchange variable"), \
+ C(ONX_VAR_CREATE_FAIL, "Couldn't create onmax or onchange variable"), \
+ C(FIELD_VAR_CREATE_FAIL,"Couldn't create field variable"), \
+ C(TOO_MANY_PARAMS, "Too many action params"), \
+ C(PARAM_NOT_FOUND, "Couldn't find param"), \
+ C(INVALID_PARAM, "Invalid action param"), \
+ C(ACTION_NOT_FOUND, "No action found"), \
+ C(NO_SAVE_PARAMS, "No params found for save()"), \
+ C(TOO_MANY_SAVE_ACTIONS,"Can't have more than one save() action per hist"), \
+ C(ACTION_MISMATCH, "Handler doesn't support action"), \
+ C(NO_CLOSING_PAREN, "No closing paren found"), \
+ C(SUBSYS_NOT_FOUND, "Missing subsystem"), \
+ C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
+ C(INVALID_REF_KEY, "Using variable references as keys not supported"), \
+ C(VAR_NOT_FOUND, "Couldn't find variable"), \
+ C(FIELD_NOT_FOUND, "Couldn't find field"),
+
+#undef C
+#define C(a, b) HIST_ERR_##a
+
+enum { ERRORS };
+
+#undef C
+#define C(a, b) b
+
+static const char *err_text[] = { ERRORS };
+
struct hist_field;
typedef u64 (*hist_field_fn_t) (struct hist_field *field,
@@ -538,7 +589,10 @@ static struct track_data *track_data_alloc(unsigned int key_len,
static char last_cmd[MAX_FILTER_STR_VAL];
static char last_cmd_loc[MAX_FILTER_STR_VAL];
-static char hist_err_str[MAX_FILTER_STR_VAL];
+static int errpos(char *str)
+{
+ return err_pos(last_cmd, str);
+}
static void last_cmd_set(struct trace_event_file *file, char *str)
{
@@ -565,55 +619,17 @@ static void last_cmd_set(struct trace_event_file *file, char *str)
snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
}
-static void hist_err(char *str, char *var)
+static void hist_err(u8 err_type, u8 err_pos)
{
- int maxlen = MAX_FILTER_STR_VAL - 1;
-
- if (!str)
- return;
-
- if (strlen(hist_err_str))
- return;
-
- if (!var)
- var = "";
-
- if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen)
- return;
-
- strcat(hist_err_str, str);
- strcat(hist_err_str, var);
-}
-
-static void hist_err_event(char *str, char *system, char *event, char *var)
-{
- char err[MAX_FILTER_STR_VAL];
-
- if (system && var)
- snprintf(err, MAX_FILTER_STR_VAL, "%s.%s.%s", system, event, var);
- else if (system)
- snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
- else
- strscpy(err, var, MAX_FILTER_STR_VAL);
-
- hist_err(str, err);
+ tracing_log_err(last_cmd_loc, last_cmd, err_text, err_type, err_pos);
}
static void hist_err_clear(void)
{
- hist_err_str[0] = '\0';
last_cmd[0] = '\0';
last_cmd_loc[0] = '\0';
}
-static bool have_hist_err(void)
-{
- if (strlen(hist_err_str))
- return true;
-
- return false;
-}
-
struct synth_trace_event {
struct trace_entry ent;
u64 fields[];
@@ -1740,7 +1756,7 @@ static struct trace_event_file *find_var_file(struct trace_array *tr,
if (find_var_field(var_hist_data, var_name)) {
if (found) {
- hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
+ hist_err(HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
return NULL;
}
@@ -1791,7 +1807,7 @@ find_match_var(struct hist_trigger_data *hist_data, char *var_name)
hist_field = find_file_var(file, var_name);
if (hist_field) {
if (found) {
- hist_err_event("Variable name not unique, need to use fully qualified name (subsys.event.var) for variable: ", system, event_name, var_name);
+ hist_err(HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
return ERR_PTR(-EINVAL);
}
@@ -2023,7 +2039,6 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs)
attrs->n_actions++;
ret = 0;
}
-
return ret;
}
@@ -2083,7 +2098,7 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
char *assignment;
if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
- hist_err("Too many variables defined: ", str);
+ hist_err(HIST_ERR_TOO_MANY_VARS, errpos(str));
ret = -EINVAL;
goto out;
}
@@ -2681,8 +2696,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
system, event_name);
if (!ref_field)
- hist_err_event("Couldn't find variable: $",
- system, event_name, var_name);
+ hist_err(HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
return ref_field;
}
@@ -2716,7 +2730,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else if (strcmp(modifier, "usecs") == 0)
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
else {
- hist_err("Invalid field modifier: ", modifier);
+ hist_err(HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
field = ERR_PTR(-EINVAL);
goto out;
}
@@ -2732,7 +2746,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else {
field = trace_find_event_field(file->event_call, field_name);
if (!field || !field->size) {
- hist_err("Couldn't find field: ", field_name);
+ hist_err(HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
field = ERR_PTR(-EINVAL);
goto out;
}
@@ -2843,7 +2857,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
/* we support only -(xxx) i.e. explicit parens required */
if (level > 3) {
- hist_err("Too many subexpressions (3 max): ", str);
+ hist_err(HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
ret = -EINVAL;
goto free;
}
@@ -2926,7 +2940,7 @@ static int check_expr_operands(struct hist_field *operand1,
if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
(operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
- hist_err("Timestamp units in expression don't match", NULL);
+ hist_err(HIST_ERR_TIMESTAMP_MISMATCH, 0);
return -EINVAL;
}
@@ -2944,7 +2958,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
char *sep, *operand1_str;
if (level > 3) {
- hist_err("Too many subexpressions (3 max): ", str);
+ hist_err(HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
return ERR_PTR(-EINVAL);
}
@@ -3182,16 +3196,14 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
int ret;
if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
- hist_err_event("trace action: Too many field variables defined: ",
- subsys_name, event_name, field_name);
+ hist_err(HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
return ERR_PTR(-EINVAL);
}
file = event_file(tr, subsys_name, event_name);
if (IS_ERR(file)) {
- hist_err_event("trace action: Event file not found: ",
- subsys_name, event_name, field_name);
+ hist_err(HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
ret = PTR_ERR(file);
return ERR_PTR(ret);
}
@@ -3204,8 +3216,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
*/
hist_data = find_compatible_hist(target_hist_data, file);
if (!hist_data) {
- hist_err_event("trace action: Matching event histogram not found: ",
- subsys_name, event_name, field_name);
+ hist_err(HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@@ -3266,8 +3277,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
kfree(cmd);
kfree(var_hist->cmd);
kfree(var_hist);
- hist_err_event("trace action: Couldn't create histogram for field: ",
- subsys_name, event_name, field_name);
+ hist_err(HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
return ERR_PTR(ret);
}
@@ -3279,8 +3289,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
if (IS_ERR_OR_NULL(event_var)) {
kfree(var_hist->cmd);
kfree(var_hist);
- hist_err_event("trace action: Couldn't find synthetic variable: ",
- subsys_name, event_name, field_name);
+ hist_err(HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@@ -3417,21 +3426,21 @@ static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
int ret = 0;
if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
- hist_err("Too many field variables defined: ", field_name);
+ hist_err(HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
ret = -EINVAL;
goto err;
}
val = parse_atom(hist_data, file, field_name, &flags, NULL);
if (IS_ERR(val)) {
- hist_err("Couldn't parse field variable: ", field_name);
+ hist_err(HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
ret = PTR_ERR(val);
goto err;
}
var = create_var(hist_data, file, field_name, val->size, val->type);
if (IS_ERR(var)) {
- hist_err("Couldn't create or find variable: ", field_name);
+ hist_err(HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
kfree(val);
ret = PTR_ERR(var);
goto err;
@@ -3763,14 +3772,14 @@ static int track_data_create(struct hist_trigger_data *hist_data,
track_data_var_str = data->track_data.var_str;
if (track_data_var_str[0] != '$') {
- hist_err("For onmax(x) or onchange(x), x must be a variable: ", track_data_var_str);
+ hist_err(HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
return -EINVAL;
}
track_data_var_str++;
var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
if (!var_field) {
- hist_err("Couldn't find onmax or onchange variable: ", track_data_var_str);
+ hist_err(HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
return -EINVAL;
}
@@ -3783,7 +3792,7 @@ static int track_data_create(struct hist_trigger_data *hist_data,
if (data->handler == HANDLER_ONMAX)
track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
if (IS_ERR(track_var)) {
- hist_err("Couldn't create onmax variable: ", "__max");
+ hist_err(HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
ret = PTR_ERR(track_var);
goto out;
}
@@ -3791,7 +3800,7 @@ static int track_data_create(struct hist_trigger_data *hist_data,
if (data->handler == HANDLER_ONCHANGE)
track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
if (IS_ERR(track_var)) {
- hist_err("Couldn't create onchange variable: ", "__change");
+ hist_err(HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
ret = PTR_ERR(track_var);
goto out;
}
@@ -3810,20 +3819,20 @@ static int parse_action_params(char *params, struct action_data *data)
while (params) {
if (data->n_params >= SYNTH_FIELDS_MAX) {
- hist_err("Too many action params", "");
+ hist_err(HIST_ERR_TOO_MANY_PARAMS, 0);
goto out;
}
param = strsep(¶ms, ",");
if (!param) {
- hist_err("No action param found", "");
+ hist_err(HIST_ERR_PARAM_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
param = strstrip(param);
if (strlen(param) < 2) {
- hist_err("Invalid action param: ", param);
+ hist_err(HIST_ERR_INVALID_PARAM, errpos(param));
ret = -EINVAL;
goto out;
}
@@ -3855,14 +3864,14 @@ static int action_parse(char *str, struct action_data *data,
strsep(&str, ".");
if (!str) {
- hist_err("action parsing: No action found", "");
+ hist_err(HIST_ERR_ACTION_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
action_name = strsep(&str, "(");
if (!action_name || !str) {
- hist_err("action parsing: No action found", "");
+ hist_err(HIST_ERR_ACTION_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
@@ -3871,7 +3880,7 @@ static int action_parse(char *str, struct action_data *data,
char *params = strsep(&str, ")");
if (!params) {
- hist_err("action parsing: No params found for %s", "save");
+ hist_err(HIST_ERR_NO_SAVE_PARAMS, 0);
ret = -EINVAL;
goto out;
}
@@ -3885,7 +3894,7 @@ static int action_parse(char *str, struct action_data *data,
else if (handler == HANDLER_ONCHANGE)
data->track_data.check_val = check_track_val_changed;
else {
- hist_err("action parsing: Handler doesn't support action: ", action_name);
+ hist_err(HIST_ERR_ACTION_MISMATCH, errpos(action_name));
ret = -EINVAL;
goto out;
}
@@ -3897,7 +3906,7 @@ static int action_parse(char *str, struct action_data *data,
char *params = strsep(&str, ")");
if (!str) {
- hist_err("action parsing: No closing paren found: %s", params);
+ hist_err(HIST_ERR_NO_CLOSING_PAREN, errpos(params));
ret = -EINVAL;
goto out;
}
@@ -3907,7 +3916,7 @@ static int action_parse(char *str, struct action_data *data,
else if (handler == HANDLER_ONCHANGE)
data->track_data.check_val = check_track_val_changed;
else {
- hist_err("action parsing: Handler doesn't support action: ", action_name);
+ hist_err(HIST_ERR_ACTION_MISMATCH, errpos(action_name));
ret = -EINVAL;
goto out;
}
@@ -4060,7 +4069,7 @@ trace_action_find_var(struct hist_trigger_data *hist_data,
}
if (!hist_field)
- hist_err_event("trace action: Couldn't find param: $", system, event, var);
+ hist_err(HIST_ERR_PARAM_NOT_FOUND, errpos(var));
return hist_field;
}
@@ -4135,7 +4144,7 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
event = find_synth_event(synth_event_name);
if (!event) {
- hist_err("trace action: Couldn't find synthetic event: ", synth_event_name);
+ hist_err(HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
return -EINVAL;
}
@@ -4196,15 +4205,14 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
continue;
}
- hist_err_event("trace action: Param type doesn't match synthetic event field type: ",
- system, event_name, param);
+ hist_err(HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
kfree(p);
ret = -EINVAL;
goto err;
}
if (field_pos != event->n_fields) {
- hist_err("trace action: Param count doesn't match synthetic event field count: ", event->name);
+ hist_err(HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
ret = -EINVAL;
goto err;
}
@@ -4250,7 +4258,7 @@ static int action_create(struct hist_trigger_data *hist_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", "");
+ hist_err(HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
goto out;
}
@@ -4263,7 +4271,7 @@ static int action_create(struct hist_trigger_data *hist_data,
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);
+ hist_err(HIST_ERR_FIELD_VAR_CREATE_FAIL, errpos(param));
ret = PTR_ERR(field_var);
kfree(param);
goto out;
@@ -4297,19 +4305,18 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
match_event = strsep(&str, ")");
if (!match_event || !str) {
- hist_err("onmatch: Missing closing paren: ", match_event);
+ hist_err(HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
goto free;
}
match_event_system = strsep(&match_event, ".");
if (!match_event) {
- hist_err("onmatch: Missing subsystem for match event: ", match_event_system);
+ hist_err(HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
goto free;
}
if (IS_ERR(event_file(tr, match_event_system, match_event))) {
- hist_err_event("onmatch: Invalid subsystem or event name: ",
- match_event_system, match_event, NULL);
+ hist_err(HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
goto free;
}
@@ -4400,7 +4407,7 @@ static int create_var_field(struct hist_trigger_data *hist_data,
return -EINVAL;
if (find_var(hist_data, file, var_name) && !hist_data->remove) {
- hist_err("Variable already defined: ", var_name);
+ hist_err(HIST_ERR_DUPLICATE_VAR, errpos(var_name));
return -EINVAL;
}
@@ -4481,7 +4488,7 @@ static int create_key_field(struct hist_trigger_data *hist_data,
}
if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
- hist_err("Using variable references as keys not supported: ", field_str);
+ hist_err(HIST_ERR_INVALID_REF_KEY, errpos(field_str));
destroy_hist_field(hist_field, 0);
ret = -EINVAL;
goto out;
@@ -4595,13 +4602,13 @@ static int parse_var_defs(struct hist_trigger_data *hist_data)
var_name = strsep(&field_str, "=");
if (!var_name || !field_str) {
- hist_err("Malformed assignment: ", var_name);
+ hist_err(HIST_ERR_MALFORMED_ASSIGNMENT, errpos(var_name));
ret = -EINVAL;
goto free;
}
if (n_vars == TRACING_MAP_VARS_MAX) {
- hist_err("Too many variables defined: ", var_name);
+ hist_err(HIST_ERR_TOO_MANY_VARS, errpos(var_name));
ret = -EINVAL;
goto free;
}
@@ -5458,11 +5465,6 @@ static int hist_show(struct seq_file *m, void *v)
hist_trigger_show(m, data, n++);
}
- if (have_hist_err()) {
- seq_printf(m, "\n%s: error: \n", hist_err_str);
- seq_printf(m, " Last command: %s\n", last_cmd);
- }
-
out_unlock:
mutex_unlock(&event_mutex);
@@ -5834,7 +5836,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
if (named_data) {
if (!hist_trigger_match(data, named_data, named_data,
true)) {
- hist_err("Named hist trigger doesn't match existing named trigger (includes variables): ", hist_data->attrs->name);
+ hist_err(HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
ret = -EINVAL;
goto out;
}
@@ -5855,7 +5857,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
else if (hist_data->attrs->clear)
hist_clear(test);
else {
- hist_err("Hist trigger already exists", NULL);
+ hist_err(HIST_ERR_TRIGGER_EEXIST, 0);
ret = -EEXIST;
}
goto out;
@@ -5863,7 +5865,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
}
new:
if (hist_data->attrs->cont || hist_data->attrs->clear) {
- hist_err("Can't clear or continue a nonexistent hist trigger", NULL);
+ hist_err(HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
ret = -ENOENT;
goto out;
}
@@ -5888,7 +5890,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
if (ret) {
- hist_err("Couldn't set trace_clock: ", clock);
+ hist_err(HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
goto out;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 06/19] tracing: Use tracing error_log with trace event filters
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (3 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 05/19] tracing: Use tracing error_log with hist triggers Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 07/19] tracing: Use tracing error_log with probe events Steven Rostedt
` (12 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Use tracing_log_err() from the new tracing error_log mechanism to send
filter parse errors to tracing/error_log.
With this change, users will be able to see filter errors by looking
at tracing/error_log.
The same errors will also be available in the filter file, as
expected.
Link: http://lkml.kernel.org/r/1d942c419941539a11d78a6810fc5740a99b2974.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events_filter.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 05a66493a164..290d42c59101 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -66,7 +66,8 @@ static const char * ops[] = { OPS };
C(INVALID_FILTER, "Meaningless filter expression"), \
C(IP_FIELD_ONLY, "Only 'ip' field is supported for function trace"), \
C(INVALID_VALUE, "Invalid value (did you forget quotes)?"), \
- C(NO_FILTER, "No filter found"),
+ C(ERRNO, "Error"), \
+ C(NO_FILTER, "No filter found")
#undef C
#define C(a, b) FILT_ERR_##a
@@ -76,7 +77,7 @@ enum { ERRORS };
#undef C
#define C(a, b) b
-static char *err_text[] = { ERRORS };
+static const char *err_text[] = { ERRORS };
/* Called after a '!' character but "!=" and "!~" are not "not"s */
static bool is_not(const char *str)
@@ -947,8 +948,14 @@ static void append_filter_err(struct filter_parse_error *pe,
if (pe->lasterr > 0) {
trace_seq_printf(s, "\n%*s", pos, "^");
trace_seq_printf(s, "\nparse_error: %s\n", err_text[pe->lasterr]);
+ tracing_log_err("event filter parse error",
+ filter->filter_string, err_text,
+ pe->lasterr, pe->lasterr_pos);
} else {
trace_seq_printf(s, "\nError: (%d)\n", pe->lasterr);
+ tracing_log_err("event filter parse error",
+ filter->filter_string, err_text,
+ FILT_ERR_ERRNO, 0);
}
trace_seq_putc(s, 0);
buf = kmemdup_nul(s->buffer, s->seq.len, GFP_KERNEL);
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 07/19] tracing: Use tracing error_log with probe events
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (4 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 06/19] tracing: Use tracing error_log with trace event filters Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 08/19] tracing: Add trace_array parameter to create_event_filter() Steven Rostedt
` (11 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim
From: Masami Hiramatsu <mhiramat@kernel.org>
Use tracing error_log with probe events for logging error more
precisely. This also makes all parse error returns -EINVAL
(except for -ENOMEM), because user can see better error message
in error_log file now.
Link: http://lkml.kernel.org/r/6a4d90e141d138040ea61f4776b991597077451e.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_kprobe.c | 77 ++++++----
kernel/trace/trace_probe.c | 274 ++++++++++++++++++++++++++----------
kernel/trace/trace_probe.h | 77 +++++++++-
kernel/trace/trace_uprobe.c | 44 ++++--
4 files changed, 348 insertions(+), 124 deletions(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 5d5129b05df7..7d736248a070 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -441,13 +441,8 @@ static int __register_trace_kprobe(struct trace_kprobe *tk)
else
ret = register_kprobe(&tk->rp.kp);
- if (ret == 0) {
+ if (ret == 0)
tk->tp.flags |= TP_FLAG_REGISTERED;
- } else if (ret == -EILSEQ) {
- pr_warn("Probing address(0x%p) is not an instruction boundary.\n",
- tk->rp.kp.addr);
- ret = -EINVAL;
- }
return ret;
}
@@ -591,7 +586,7 @@ static int trace_kprobe_create(int argc, const char *argv[])
* Type of args:
* FETCHARG:TYPE : use TYPE instead of unsigned long.
*/
- struct trace_kprobe *tk;
+ struct trace_kprobe *tk = NULL;
int i, len, ret = 0;
bool is_return = false;
char *symbol = NULL, *tmp = NULL;
@@ -615,44 +610,50 @@ static int trace_kprobe_create(int argc, const char *argv[])
if (argc < 2)
return -ECANCELED;
+ trace_probe_log_init("trace_kprobe", argc, argv);
+
event = strchr(&argv[0][1], ':');
if (event)
event++;
if (isdigit(argv[0][1])) {
if (!is_return) {
- pr_info("Maxactive is not for kprobe");
- return -EINVAL;
+ trace_probe_log_err(1, MAXACT_NO_KPROBE);
+ goto parse_error;
}
if (event)
len = event - &argv[0][1] - 1;
else
len = strlen(&argv[0][1]);
- if (len > MAX_EVENT_NAME_LEN - 1)
- return -E2BIG;
+ if (len > MAX_EVENT_NAME_LEN - 1) {
+ trace_probe_log_err(1, BAD_MAXACT);
+ goto parse_error;
+ }
memcpy(buf, &argv[0][1], len);
buf[len] = '\0';
ret = kstrtouint(buf, 0, &maxactive);
if (ret || !maxactive) {
- pr_info("Invalid maxactive number\n");
- return ret;
+ trace_probe_log_err(1, BAD_MAXACT);
+ goto parse_error;
}
/* kretprobes instances are iterated over via a list. The
* maximum should stay reasonable.
*/
if (maxactive > KRETPROBE_MAXACTIVE_MAX) {
- pr_info("Maxactive is too big (%d > %d).\n",
- maxactive, KRETPROBE_MAXACTIVE_MAX);
- return -E2BIG;
+ trace_probe_log_err(1, MAXACT_TOO_BIG);
+ goto parse_error;
}
}
/* try to parse an address. if that fails, try to read the
* input as a symbol. */
if (kstrtoul(argv[1], 0, (unsigned long *)&addr)) {
+ trace_probe_log_set_index(1);
/* Check whether uprobe event specified */
- if (strchr(argv[1], '/') && strchr(argv[1], ':'))
- return -ECANCELED;
+ if (strchr(argv[1], '/') && strchr(argv[1], ':')) {
+ ret = -ECANCELED;
+ goto error;
+ }
/* a symbol specified */
symbol = kstrdup(argv[1], GFP_KERNEL);
if (!symbol)
@@ -660,23 +661,23 @@ static int trace_kprobe_create(int argc, const char *argv[])
/* TODO: support .init module functions */
ret = traceprobe_split_symbol_offset(symbol, &offset);
if (ret || offset < 0 || offset > UINT_MAX) {
- pr_info("Failed to parse either an address or a symbol.\n");
- goto out;
+ trace_probe_log_err(0, BAD_PROBE_ADDR);
+ goto parse_error;
}
if (kprobe_on_func_entry(NULL, symbol, offset))
flags |= TPARG_FL_FENTRY;
if (offset && is_return && !(flags & TPARG_FL_FENTRY)) {
- pr_info("Given offset is not valid for return probe.\n");
- ret = -EINVAL;
- goto out;
+ trace_probe_log_err(0, BAD_RETPROBE);
+ goto parse_error;
}
}
- argc -= 2; argv += 2;
+ trace_probe_log_set_index(0);
if (event) {
- ret = traceprobe_parse_event_name(&event, &group, buf);
+ ret = traceprobe_parse_event_name(&event, &group, buf,
+ event - argv[0]);
if (ret)
- goto out;
+ goto parse_error;
} else {
/* Make a new event name */
if (symbol)
@@ -691,13 +692,14 @@ static int trace_kprobe_create(int argc, const char *argv[])
/* setup a probe */
tk = alloc_trace_kprobe(group, event, addr, symbol, offset, maxactive,
- argc, is_return);
+ argc - 2, is_return);
if (IS_ERR(tk)) {
ret = PTR_ERR(tk);
- /* This must return -ENOMEM otherwise there is a bug */
+ /* This must return -ENOMEM, else there is a bug */
WARN_ON_ONCE(ret != -ENOMEM);
- goto out;
+ goto out; /* We know tk is not allocated */
}
+ argc -= 2; argv += 2;
/* parse arguments */
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
@@ -707,19 +709,32 @@ static int trace_kprobe_create(int argc, const char *argv[])
goto error;
}
+ trace_probe_log_set_index(i + 2);
ret = traceprobe_parse_probe_arg(&tk->tp, i, tmp, flags);
kfree(tmp);
if (ret)
- goto error;
+ goto error; /* This can be -ENOMEM */
}
ret = register_trace_kprobe(tk);
- if (ret)
+ if (ret) {
+ trace_probe_log_set_index(1);
+ if (ret == -EILSEQ)
+ trace_probe_log_err(0, BAD_INSN_BNDRY);
+ else if (ret == -ENOENT)
+ trace_probe_log_err(0, BAD_PROBE_ADDR);
+ else if (ret != -ENOMEM)
+ trace_probe_log_err(0, FAIL_REG_PROBE);
goto error;
+ }
+
out:
+ trace_probe_log_clear();
kfree(symbol);
return ret;
+parse_error:
+ ret = -EINVAL;
error:
free_trace_kprobe(tk);
goto out;
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 8f8411e7835f..e11f98c49d72 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -13,6 +13,11 @@
#include "trace_probe.h"
+#undef C
+#define C(a, b) b
+
+static const char *trace_probe_err_text[] = { ERRORS };
+
static const char *reserved_field_names[] = {
"common_type",
"common_flags",
@@ -133,6 +138,60 @@ static const struct fetch_type *find_fetch_type(const char *type)
return NULL;
}
+static struct trace_probe_log trace_probe_log;
+
+void trace_probe_log_init(const char *subsystem, int argc, const char **argv)
+{
+ trace_probe_log.subsystem = subsystem;
+ trace_probe_log.argc = argc;
+ trace_probe_log.argv = argv;
+ trace_probe_log.index = 0;
+}
+
+void trace_probe_log_clear(void)
+{
+ memset(&trace_probe_log, 0, sizeof(trace_probe_log));
+}
+
+void trace_probe_log_set_index(int index)
+{
+ trace_probe_log.index = index;
+}
+
+void __trace_probe_log_err(int offset, int err_type)
+{
+ char *command, *p;
+ int i, len = 0, pos = 0;
+
+ if (!trace_probe_log.argv)
+ return;
+
+ /* Recalcurate the length and allocate buffer */
+ for (i = 0; i < trace_probe_log.argc; i++) {
+ if (i == trace_probe_log.index)
+ pos = len;
+ len += strlen(trace_probe_log.argv[i]) + 1;
+ }
+ command = kzalloc(len, GFP_KERNEL);
+ if (!command)
+ return;
+
+ /* And make a command string from argv array */
+ p = command;
+ for (i = 0; i < trace_probe_log.argc; i++) {
+ len = strlen(trace_probe_log.argv[i]);
+ strcpy(p, trace_probe_log.argv[i]);
+ p[len] = ' ';
+ p += len + 1;
+ }
+ *(p - 1) = '\0';
+
+ tracing_log_err(trace_probe_log.subsystem, command,
+ trace_probe_err_text, err_type, pos + offset);
+
+ kfree(command);
+}
+
/* Split symbol and offset. */
int traceprobe_split_symbol_offset(char *symbol, long *offset)
{
@@ -156,7 +215,7 @@ int traceprobe_split_symbol_offset(char *symbol, long *offset)
/* @buf must has MAX_EVENT_NAME_LEN size */
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
- char *buf)
+ char *buf, int offset)
{
const char *slash, *event = *pevent;
int len;
@@ -164,32 +223,33 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
slash = strchr(event, '/');
if (slash) {
if (slash == event) {
- pr_info("Group name is not specified\n");
+ trace_probe_log_err(offset, NO_GROUP_NAME);
return -EINVAL;
}
if (slash - event + 1 > MAX_EVENT_NAME_LEN) {
- pr_info("Group name is too long\n");
- return -E2BIG;
+ trace_probe_log_err(offset, GROUP_TOO_LONG);
+ return -EINVAL;
}
strlcpy(buf, event, slash - event + 1);
if (!is_good_name(buf)) {
- pr_info("Group name must follow the same rules as C identifiers\n");
+ trace_probe_log_err(offset, BAD_GROUP_NAME);
return -EINVAL;
}
*pgroup = buf;
*pevent = slash + 1;
+ offset += slash - event + 1;
event = *pevent;
}
len = strlen(event);
if (len == 0) {
- pr_info("Event name is not specified\n");
+ trace_probe_log_err(offset, NO_EVENT_NAME);
return -EINVAL;
} else if (len > MAX_EVENT_NAME_LEN) {
- pr_info("Event name is too long\n");
- return -E2BIG;
+ trace_probe_log_err(offset, EVENT_TOO_LONG);
+ return -EINVAL;
}
if (!is_good_name(event)) {
- pr_info("Event name must follow the same rules as C identifiers\n");
+ trace_probe_log_err(offset, BAD_EVENT_NAME);
return -EINVAL;
}
return 0;
@@ -198,56 +258,67 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
static int parse_probe_vars(char *arg, const struct fetch_type *t,
- struct fetch_insn *code, unsigned int flags)
+ struct fetch_insn *code, unsigned int flags, int offs)
{
unsigned long param;
int ret = 0;
int len;
if (strcmp(arg, "retval") == 0) {
- if (flags & TPARG_FL_RETURN)
+ if (flags & TPARG_FL_RETURN) {
code->op = FETCH_OP_RETVAL;
- else
+ } else {
+ trace_probe_log_err(offs, RETVAL_ON_PROBE);
ret = -EINVAL;
+ }
} else if ((len = str_has_prefix(arg, "stack"))) {
if (arg[len] == '\0') {
code->op = FETCH_OP_STACKP;
} else if (isdigit(arg[len])) {
ret = kstrtoul(arg + len, 10, ¶m);
- if (ret || ((flags & TPARG_FL_KERNEL) &&
- param > PARAM_MAX_STACK))
+ if (ret) {
+ goto inval_var;
+ } else if ((flags & TPARG_FL_KERNEL) &&
+ param > PARAM_MAX_STACK) {
+ trace_probe_log_err(offs, BAD_STACK_NUM);
ret = -EINVAL;
- else {
+ } else {
code->op = FETCH_OP_STACK;
code->param = (unsigned int)param;
}
} else
- ret = -EINVAL;
+ goto inval_var;
} else if (strcmp(arg, "comm") == 0) {
code->op = FETCH_OP_COMM;
#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
} else if (((flags & TPARG_FL_MASK) ==
(TPARG_FL_KERNEL | TPARG_FL_FENTRY)) &&
(len = str_has_prefix(arg, "arg"))) {
- if (!isdigit(arg[len]))
- return -EINVAL;
ret = kstrtoul(arg + len, 10, ¶m);
- if (ret || !param || param > PARAM_MAX_STACK)
+ if (ret) {
+ goto inval_var;
+ } else if (!param || param > PARAM_MAX_STACK) {
+ trace_probe_log_err(offs, BAD_ARG_NUM);
return -EINVAL;
+ }
code->op = FETCH_OP_ARG;
code->param = (unsigned int)param - 1;
#endif
} else
- ret = -EINVAL;
+ goto inval_var;
return ret;
+
+inval_var:
+ trace_probe_log_err(offs, BAD_VAR);
+ return -EINVAL;
}
/* Recursive argument parser */
static int
parse_probe_arg(char *arg, const struct fetch_type *type,
struct fetch_insn **pcode, struct fetch_insn *end,
- unsigned int flags)
+ unsigned int flags, int offs)
{
struct fetch_insn *code = *pcode;
unsigned long param;
@@ -257,7 +328,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
switch (arg[0]) {
case '$':
- ret = parse_probe_vars(arg + 1, type, code, flags);
+ ret = parse_probe_vars(arg + 1, type, code, flags, offs);
break;
case '%': /* named register */
@@ -266,47 +337,57 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
code->op = FETCH_OP_REG;
code->param = (unsigned int)ret;
ret = 0;
- }
+ } else
+ trace_probe_log_err(offs, BAD_REG_NAME);
break;
case '@': /* memory, file-offset or symbol */
if (isdigit(arg[1])) {
ret = kstrtoul(arg + 1, 0, ¶m);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offs, BAD_MEM_ADDR);
break;
+ }
/* load address */
code->op = FETCH_OP_IMM;
code->immediate = param;
} else if (arg[1] == '+') {
/* kprobes don't support file offsets */
- if (flags & TPARG_FL_KERNEL)
+ if (flags & TPARG_FL_KERNEL) {
+ trace_probe_log_err(offs, FILE_ON_KPROBE);
return -EINVAL;
-
+ }
ret = kstrtol(arg + 2, 0, &offset);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offs, BAD_FILE_OFFS);
break;
+ }
code->op = FETCH_OP_FOFFS;
code->immediate = (unsigned long)offset; // imm64?
} else {
/* uprobes don't support symbols */
- if (!(flags & TPARG_FL_KERNEL))
+ if (!(flags & TPARG_FL_KERNEL)) {
+ trace_probe_log_err(offs, SYM_ON_UPROBE);
return -EINVAL;
-
+ }
/* Preserve symbol for updating */
code->op = FETCH_NOP_SYMBOL;
code->data = kstrdup(arg + 1, GFP_KERNEL);
if (!code->data)
return -ENOMEM;
- if (++code == end)
- return -E2BIG;
-
+ if (++code == end) {
+ trace_probe_log_err(offs, TOO_MANY_OPS);
+ return -EINVAL;
+ }
code->op = FETCH_OP_IMM;
code->immediate = 0;
}
/* These are fetching from memory */
- if (++code == end)
- return -E2BIG;
+ if (++code == end) {
+ trace_probe_log_err(offs, TOO_MANY_OPS);
+ return -EINVAL;
+ }
*pcode = code;
code->op = FETCH_OP_DEREF;
code->offset = offset;
@@ -317,28 +398,38 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
/* fall through */
case '-':
tmp = strchr(arg, '(');
- if (!tmp)
+ if (!tmp) {
+ trace_probe_log_err(offs, DEREF_NEED_BRACE);
return -EINVAL;
-
+ }
*tmp = '\0';
ret = kstrtol(arg, 0, &offset);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offs, BAD_DEREF_OFFS);
break;
-
+ }
+ offs += (tmp + 1 - arg) + (arg[0] != '-' ? 1 : 0);
arg = tmp + 1;
tmp = strrchr(arg, ')');
-
- if (tmp) {
+ if (!tmp) {
+ trace_probe_log_err(offs + strlen(arg),
+ DEREF_OPEN_BRACE);
+ return -EINVAL;
+ } else {
const struct fetch_type *t2 = find_fetch_type(NULL);
*tmp = '\0';
- ret = parse_probe_arg(arg, t2, &code, end, flags);
+ ret = parse_probe_arg(arg, t2, &code, end, flags, offs);
if (ret)
break;
- if (code->op == FETCH_OP_COMM)
+ if (code->op == FETCH_OP_COMM) {
+ trace_probe_log_err(offs, COMM_CANT_DEREF);
+ return -EINVAL;
+ }
+ if (++code == end) {
+ trace_probe_log_err(offs, TOO_MANY_OPS);
return -EINVAL;
- if (++code == end)
- return -E2BIG;
+ }
*pcode = code;
code->op = FETCH_OP_DEREF;
@@ -348,6 +439,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type,
}
if (!ret && code->op == FETCH_OP_NOP) {
/* Parsed, but do not find fetch method */
+ trace_probe_log_err(offs, BAD_FETCH_ARG);
ret = -EINVAL;
}
return ret;
@@ -379,7 +471,7 @@ static int __parse_bitfield_probe_arg(const char *bf,
return -EINVAL;
code++;
if (code->op != FETCH_OP_NOP)
- return -E2BIG;
+ return -EINVAL;
*pcode = code;
code->op = FETCH_OP_MOD_BF;
@@ -392,32 +484,53 @@ static int __parse_bitfield_probe_arg(const char *bf,
/* String length checking wrapper */
static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
- struct probe_arg *parg, unsigned int flags)
+ struct probe_arg *parg, unsigned int flags, int offset)
{
struct fetch_insn *code, *scode, *tmp = NULL;
- char *t, *t2;
+ char *t, *t2, *t3;
int ret, len;
- if (strlen(arg) > MAX_ARGSTR_LEN) {
- pr_info("Argument is too long.: %s\n", arg);
- return -ENOSPC;
+ len = strlen(arg);
+ if (len > MAX_ARGSTR_LEN) {
+ trace_probe_log_err(offset, ARG_TOO_LONG);
+ return -EINVAL;
+ } else if (len == 0) {
+ trace_probe_log_err(offset, NO_ARG_BODY);
+ return -EINVAL;
}
+
parg->comm = kstrdup(arg, GFP_KERNEL);
- if (!parg->comm) {
- pr_info("Failed to allocate memory for command '%s'.\n", arg);
+ if (!parg->comm)
return -ENOMEM;
- }
+
t = strchr(arg, ':');
if (t) {
*t = '\0';
t2 = strchr(++t, '[');
if (t2) {
- *t2 = '\0';
- parg->count = simple_strtoul(t2 + 1, &t2, 0);
- if (strcmp(t2, "]") || parg->count == 0)
+ *t2++ = '\0';
+ t3 = strchr(t2, ']');
+ if (!t3) {
+ offset += t2 + strlen(t2) - arg;
+ trace_probe_log_err(offset,
+ ARRAY_NO_CLOSE);
+ return -EINVAL;
+ } else if (t3[1] != '\0') {
+ trace_probe_log_err(offset + t3 + 1 - arg,
+ BAD_ARRAY_SUFFIX);
+ return -EINVAL;
+ }
+ *t3 = '\0';
+ if (kstrtouint(t2, 0, &parg->count) || !parg->count) {
+ trace_probe_log_err(offset + t2 - arg,
+ BAD_ARRAY_NUM);
return -EINVAL;
- if (parg->count > MAX_ARRAY_LEN)
- return -E2BIG;
+ }
+ if (parg->count > MAX_ARRAY_LEN) {
+ trace_probe_log_err(offset + t2 - arg,
+ ARRAY_TOO_BIG);
+ return -EINVAL;
+ }
}
}
/*
@@ -429,7 +542,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
else
parg->type = find_fetch_type(t);
if (!parg->type) {
- pr_info("Unsupported type: %s\n", t);
+ trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
return -EINVAL;
}
parg->offset = *size;
@@ -450,7 +563,7 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
- flags);
+ flags, offset);
if (ret)
goto fail;
@@ -458,7 +571,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
if (!strcmp(parg->type->name, "string")) {
if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_IMM &&
code->op != FETCH_OP_COMM) {
- pr_info("string only accepts memory or address.\n");
+ trace_probe_log_err(offset + (t ? (t - arg) : 0),
+ BAD_STRING);
ret = -EINVAL;
goto fail;
}
@@ -470,7 +584,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
*/
code++;
if (code->op != FETCH_OP_NOP) {
- ret = -E2BIG;
+ trace_probe_log_err(offset, TOO_MANY_OPS);
+ ret = -EINVAL;
goto fail;
}
}
@@ -483,7 +598,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
} else {
code++;
if (code->op != FETCH_OP_NOP) {
- ret = -E2BIG;
+ trace_probe_log_err(offset, TOO_MANY_OPS);
+ ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_ST_RAW;
@@ -493,20 +609,24 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
/* Modify operation */
if (t != NULL) {
ret = __parse_bitfield_probe_arg(t, parg->type, &code);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offset + t - arg, BAD_BITFIELD);
goto fail;
+ }
}
/* Loop(Array) operation */
if (parg->count) {
if (scode->op != FETCH_OP_ST_MEM &&
scode->op != FETCH_OP_ST_STRING) {
- pr_info("array only accepts memory or address\n");
+ trace_probe_log_err(offset + (t ? (t - arg) : 0),
+ BAD_STRING);
ret = -EINVAL;
goto fail;
}
code++;
if (code->op != FETCH_OP_NOP) {
- ret = -E2BIG;
+ trace_probe_log_err(offset, TOO_MANY_OPS);
+ ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_LP_ARRAY;
@@ -555,15 +675,19 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
{
struct probe_arg *parg = &tp->args[i];
char *body;
- int ret;
/* Increment count for freeing args in error case */
tp->nr_args++;
body = strchr(arg, '=');
if (body) {
- if (body - arg > MAX_ARG_NAME_LEN || body == arg)
+ if (body - arg > MAX_ARG_NAME_LEN) {
+ trace_probe_log_err(0, ARG_NAME_TOO_LONG);
+ return -EINVAL;
+ } else if (body == arg) {
+ trace_probe_log_err(0, NO_ARG_NAME);
return -EINVAL;
+ }
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
body++;
} else {
@@ -575,22 +699,16 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
return -ENOMEM;
if (!is_good_name(parg->name)) {
- pr_info("Invalid argument[%d] name: %s\n",
- i, parg->name);
+ trace_probe_log_err(0, BAD_ARG_NAME);
return -EINVAL;
}
-
if (traceprobe_conflict_field_name(parg->name, tp->args, i)) {
- pr_info("Argument[%d]: '%s' conflicts with another field.\n",
- i, parg->name);
+ trace_probe_log_err(0, USED_ARG_NAME);
return -EINVAL;
}
-
/* Parse fetch argument */
- ret = traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags);
- if (ret)
- pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
- return ret;
+ return traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags,
+ body - arg);
}
void traceprobe_free_probe_arg(struct probe_arg *arg)
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 2177c206de15..b7737666c1a8 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -280,8 +280,8 @@ extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
-extern int traceprobe_parse_event_name(const char **pevent,
- const char **pgroup, char *buf);
+int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
+ char *buf, int offset);
extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
@@ -298,3 +298,76 @@ extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
#endif
extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
size_t offset, struct trace_probe *tp);
+
+#undef ERRORS
+#define ERRORS \
+ C(FILE_NOT_FOUND, "Failed to find the given file"), \
+ C(NO_REGULAR_FILE, "Not a regular file"), \
+ C(BAD_REFCNT, "Invalid reference counter offset"), \
+ C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \
+ C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \
+ C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \
+ C(MAXACT_NO_KPROBE, "Maxactive is not for kprobe"), \
+ C(BAD_MAXACT, "Invalid maxactive number"), \
+ C(MAXACT_TOO_BIG, "Maxactive is too big"), \
+ C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \
+ C(BAD_RETPROBE, "Retprobe address must be an function entry"), \
+ C(NO_GROUP_NAME, "Group name is not specified"), \
+ C(GROUP_TOO_LONG, "Group name is too long"), \
+ C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \
+ C(NO_EVENT_NAME, "Event name is not specified"), \
+ C(EVENT_TOO_LONG, "Event name is too long"), \
+ C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \
+ C(RETVAL_ON_PROBE, "$retval is not available on probe"), \
+ C(BAD_STACK_NUM, "Invalid stack number"), \
+ C(BAD_ARG_NUM, "Invalid argument number"), \
+ C(BAD_VAR, "Invalid $-valiable specified"), \
+ C(BAD_REG_NAME, "Invalid register name"), \
+ C(BAD_MEM_ADDR, "Invalid memory address"), \
+ C(FILE_ON_KPROBE, "File offset is not available with kprobe"), \
+ C(BAD_FILE_OFFS, "Invalid file offset value"), \
+ C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \
+ C(TOO_MANY_OPS, "Dereference is too much nested"), \
+ C(DEREF_NEED_BRACE, "Dereference needs a brace"), \
+ C(BAD_DEREF_OFFS, "Invalid dereference offset"), \
+ C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \
+ C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \
+ C(BAD_FETCH_ARG, "Invalid fetch argument"), \
+ C(ARRAY_NO_CLOSE, "Array is not closed"), \
+ C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \
+ C(BAD_ARRAY_NUM, "Invalid array size"), \
+ C(ARRAY_TOO_BIG, "Array number is too big"), \
+ C(BAD_TYPE, "Unknown type is specified"), \
+ C(BAD_STRING, "String accepts only memory argument"), \
+ C(BAD_BITFIELD, "Invalid bitfield"), \
+ C(ARG_NAME_TOO_LONG, "Argument name is too long"), \
+ C(NO_ARG_NAME, "Argument name is not specified"), \
+ C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \
+ C(USED_ARG_NAME, "This argument name is already used"), \
+ C(ARG_TOO_LONG, "Argument expression is too long"), \
+ C(NO_ARG_BODY, "No argument expression"), \
+ C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\
+ C(FAIL_REG_PROBE, "Failed to register probe event"),
+
+#undef C
+#define C(a, b) TP_ERR_##a
+
+/* Define TP_ERR_ */
+enum { ERRORS };
+
+/* Error text is defined in trace_probe.c */
+
+struct trace_probe_log {
+ const char *subsystem;
+ const char **argv;
+ int argc;
+ int index;
+};
+
+void trace_probe_log_init(const char *subsystem, int argc, const char **argv);
+void trace_probe_log_set_index(int index);
+void trace_probe_log_clear(void);
+void __trace_probe_log_err(int offset, int err);
+
+#define trace_probe_log_err(offs, err) \
+ __trace_probe_log_err(offs, TP_ERR_##err)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index be78d99ee6bc..cd8750a72768 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -457,13 +457,19 @@ static int trace_uprobe_create(int argc, const char **argv)
return -ECANCELED;
}
+ trace_probe_log_init("trace_uprobe", argc, argv);
+ trace_probe_log_set_index(1); /* filename is the 2nd argument */
+
*arg++ = '\0';
ret = kern_path(filename, LOOKUP_FOLLOW, &path);
if (ret) {
+ trace_probe_log_err(0, FILE_NOT_FOUND);
kfree(filename);
+ trace_probe_log_clear();
return ret;
}
if (!d_is_reg(path.dentry)) {
+ trace_probe_log_err(0, NO_REGULAR_FILE);
ret = -EINVAL;
goto fail_address_parse;
}
@@ -472,9 +478,16 @@ static int trace_uprobe_create(int argc, const char **argv)
rctr = strchr(arg, '(');
if (rctr) {
rctr_end = strchr(rctr, ')');
- if (rctr > rctr_end || *(rctr_end + 1) != 0) {
+ if (!rctr_end) {
+ ret = -EINVAL;
+ rctr_end = rctr + strlen(rctr);
+ trace_probe_log_err(rctr_end - filename,
+ REFCNT_OPEN_BRACE);
+ goto fail_address_parse;
+ } else if (rctr_end[1] != '\0') {
ret = -EINVAL;
- pr_info("Invalid reference counter offset.\n");
+ trace_probe_log_err(rctr_end + 1 - filename,
+ BAD_REFCNT_SUFFIX);
goto fail_address_parse;
}
@@ -482,22 +495,23 @@ static int trace_uprobe_create(int argc, const char **argv)
*rctr_end = '\0';
ret = kstrtoul(rctr, 0, &ref_ctr_offset);
if (ret) {
- pr_info("Invalid reference counter offset.\n");
+ trace_probe_log_err(rctr - filename, BAD_REFCNT);
goto fail_address_parse;
}
}
/* Parse uprobe offset. */
ret = kstrtoul(arg, 0, &offset);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS);
goto fail_address_parse;
-
- argc -= 2;
- argv += 2;
+ }
/* setup a probe */
+ trace_probe_log_set_index(0);
if (event) {
- ret = traceprobe_parse_event_name(&event, &group, buf);
+ ret = traceprobe_parse_event_name(&event, &group, buf,
+ event - argv[0]);
if (ret)
goto fail_address_parse;
} else {
@@ -519,6 +533,9 @@ static int trace_uprobe_create(int argc, const char **argv)
kfree(tail);
}
+ argc -= 2;
+ argv += 2;
+
tu = alloc_trace_uprobe(group, event, argc, is_return);
if (IS_ERR(tu)) {
ret = PTR_ERR(tu);
@@ -539,6 +556,7 @@ static int trace_uprobe_create(int argc, const char **argv)
goto error;
}
+ trace_probe_log_set_index(i + 2);
ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp,
is_return ? TPARG_FL_RETURN : 0);
kfree(tmp);
@@ -547,20 +565,20 @@ static int trace_uprobe_create(int argc, const char **argv)
}
ret = register_trace_uprobe(tu);
- if (ret)
- goto error;
- return 0;
+ if (!ret)
+ goto out;
error:
free_trace_uprobe(tu);
+out:
+ trace_probe_log_clear();
return ret;
fail_address_parse:
+ trace_probe_log_clear();
path_put(&path);
kfree(filename);
- pr_info("Failed to parse address or file.\n");
-
return ret;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 08/19] tracing: Add trace_array parameter to create_event_filter()
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (5 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 07/19] tracing: Use tracing error_log with probe events Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 09/19] tracing: Have histogram code pass around trace_array for error handling Steven Rostedt
` (10 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Tom Zanussi
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Pass in the trace_array that represents the instance the filter being
changed is in to create_event_filter(). This will allow for error messages
that happen when writing to the filter can be displayed in the proper
instance "error_log" file.
Note, for calls to create_filter() (that was also modified to support
create_event_filter()), that changes filters that do not exist in a instance
(for perf for example), NULL may be passed in, which means that there will
not be any message to log for that filter.
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace.h | 3 ++-
kernel/trace/trace_events_filter.c | 25 ++++++++++++++-----------
kernel/trace/trace_events_trigger.c | 3 ++-
3 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index b711edbef7e7..809c5d7f0064 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1553,7 +1553,8 @@ extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
extern void print_subsystem_event_filter(struct event_subsystem *system,
struct trace_seq *s);
extern int filter_assign_type(const char *type);
-extern int create_event_filter(struct trace_event_call *call,
+extern int create_event_filter(struct trace_array *tr,
+ struct trace_event_call *call,
char *filter_str, bool set_str,
struct event_filter **filterp);
extern void free_event_filter(struct event_filter *filter);
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 290d42c59101..2b63930cd3e6 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -920,7 +920,8 @@ static void remove_filter_string(struct event_filter *filter)
filter->filter_string = NULL;
}
-static void append_filter_err(struct filter_parse_error *pe,
+static void append_filter_err(struct trace_array *tr,
+ struct filter_parse_error *pe,
struct event_filter *filter)
{
struct trace_seq *s;
@@ -1607,7 +1608,7 @@ static int process_system_preds(struct trace_subsystem_dir *dir,
if (err) {
filter_disable(file);
parse_error(pe, FILT_ERR_BAD_SUBSYS_FILTER, 0);
- append_filter_err(pe, filter);
+ append_filter_err(tr, pe, filter);
} else
event_set_filtered_flag(file);
@@ -1719,7 +1720,8 @@ static void create_filter_finish(struct filter_parse_error *pe)
* information if @set_str is %true and the caller is responsible for
* freeing it.
*/
-static int create_filter(struct trace_event_call *call,
+static int create_filter(struct trace_array *tr,
+ struct trace_event_call *call,
char *filter_string, bool set_str,
struct event_filter **filterp)
{
@@ -1736,17 +1738,18 @@ static int create_filter(struct trace_event_call *call,
err = process_preds(call, filter_string, *filterp, pe);
if (err && set_str)
- append_filter_err(pe, *filterp);
+ append_filter_err(tr, pe, *filterp);
create_filter_finish(pe);
return err;
}
-int create_event_filter(struct trace_event_call *call,
+int create_event_filter(struct trace_array *tr,
+ struct trace_event_call *call,
char *filter_str, bool set_str,
struct event_filter **filterp)
{
- return create_filter(call, filter_str, set_str, filterp);
+ return create_filter(tr, call, filter_str, set_str, filterp);
}
/**
@@ -1773,7 +1776,7 @@ static int create_system_filter(struct trace_subsystem_dir *dir,
kfree((*filterp)->filter_string);
(*filterp)->filter_string = NULL;
} else {
- append_filter_err(pe, *filterp);
+ append_filter_err(tr, pe, *filterp);
}
}
create_filter_finish(pe);
@@ -1804,7 +1807,7 @@ int apply_event_filter(struct trace_event_file *file, char *filter_string)
return 0;
}
- err = create_filter(call, filter_string, true, &filter);
+ err = create_filter(file->tr, call, filter_string, true, &filter);
/*
* Always swap the call filter with the new filter
@@ -2060,7 +2063,7 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
if (event->filter)
goto out_unlock;
- err = create_filter(call, filter_str, false, &filter);
+ err = create_filter(NULL, call, filter_str, false, &filter);
if (err)
goto free_filter;
@@ -2209,8 +2212,8 @@ static __init int ftrace_test_event_filter(void)
struct test_filter_data_t *d = &test_filter_data[i];
int err;
- err = create_filter(&event_ftrace_test_filter, d->filter,
- false, &filter);
+ err = create_filter(NULL, &event_ftrace_test_filter,
+ d->filter, false, &filter);
if (err) {
printk(KERN_INFO
"Failed to get filter for '%s', err %d\n",
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index cd12ecb66eb9..2a2912cb4533 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -731,7 +731,8 @@ int set_trigger_filter(char *filter_str,
goto out;
/* The filter is for the 'trigger' event, not the triggered event */
- ret = create_event_filter(file->event_call, filter_str, false, &filter);
+ ret = create_event_filter(file->tr, file->event_call,
+ filter_str, false, &filter);
/*
* If create_event_filter() fails, filter still needs to be freed.
* Which the calling code will do with data->filter.
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 09/19] tracing: Have histogram code pass around trace_array for error handling
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (6 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 08/19] tracing: Add trace_array parameter to create_event_filter() Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 10/19] tracing: Have the error logs show up in the proper instances Steven Rostedt
` (9 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Tom Zanussi
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Have the trace_array that associates the trace instance of the histogram
passed around to functions so that error handling can display the error
message in the proper instance.
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace_events_hist.c | 142 +++++++++++++++++--------------
1 file changed, 80 insertions(+), 62 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 071c62cacba7..a167e439e9a1 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -619,7 +619,7 @@ static void last_cmd_set(struct trace_event_file *file, char *str)
snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
}
-static void hist_err(u8 err_type, u8 err_pos)
+static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
{
tracing_log_err(last_cmd_loc, last_cmd, err_text, err_type, err_pos);
}
@@ -1756,7 +1756,7 @@ static struct trace_event_file *find_var_file(struct trace_array *tr,
if (find_var_field(var_hist_data, var_name)) {
if (found) {
- hist_err(HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
+ hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
return NULL;
}
@@ -1807,7 +1807,8 @@ find_match_var(struct hist_trigger_data *hist_data, char *var_name)
hist_field = find_file_var(file, var_name);
if (hist_field) {
if (found) {
- hist_err(HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
+ hist_err(tr, HIST_ERR_VAR_NOT_UNIQUE,
+ errpos(var_name));
return ERR_PTR(-EINVAL);
}
@@ -2042,7 +2043,8 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs)
return ret;
}
-static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
+static int parse_assignment(struct trace_array *tr,
+ char *str, struct hist_trigger_attrs *attrs)
{
int ret = 0;
@@ -2098,7 +2100,7 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
char *assignment;
if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
- hist_err(HIST_ERR_TOO_MANY_VARS, errpos(str));
+ hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
ret = -EINVAL;
goto out;
}
@@ -2115,7 +2117,8 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs)
return ret;
}
-static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
+static struct hist_trigger_attrs *
+parse_hist_trigger_attrs(struct trace_array *tr, char *trigger_str)
{
struct hist_trigger_attrs *attrs;
int ret = 0;
@@ -2128,7 +2131,7 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
char *str = strsep(&trigger_str, ":");
if (strchr(str, '=')) {
- ret = parse_assignment(str, attrs);
+ ret = parse_assignment(tr, str, attrs);
if (ret)
goto free;
} else if (strcmp(str, "pause") == 0)
@@ -2684,6 +2687,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
char *var_name)
{
struct hist_field *var_field = NULL, *ref_field = NULL;
+ struct trace_array *tr = hist_data->event_file->tr;
if (!is_var_ref(var_name))
return NULL;
@@ -2696,7 +2700,7 @@ static struct hist_field *parse_var_ref(struct hist_trigger_data *hist_data,
system, event_name);
if (!ref_field)
- hist_err(HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
+ hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
return ref_field;
}
@@ -2707,6 +2711,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
{
struct ftrace_event_field *field = NULL;
char *field_name, *modifier, *str;
+ struct trace_array *tr = file->tr;
modifier = str = kstrdup(field_str, GFP_KERNEL);
if (!modifier)
@@ -2730,7 +2735,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else if (strcmp(modifier, "usecs") == 0)
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
else {
- hist_err(HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
+ hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
field = ERR_PTR(-EINVAL);
goto out;
}
@@ -2746,7 +2751,7 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
else {
field = trace_find_event_field(file->event_call, field_name);
if (!field || !field->size) {
- hist_err(HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
+ hist_err(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
field = ERR_PTR(-EINVAL);
goto out;
}
@@ -2808,7 +2813,8 @@ static struct hist_field *parse_atom(struct hist_trigger_data *hist_data,
s = local_field_var_ref(hist_data, ref_system, ref_event, ref_var);
if (!s) {
- hist_field = parse_var_ref(hist_data, ref_system, ref_event, ref_var);
+ hist_field = parse_var_ref(hist_data, ref_system,
+ ref_event, ref_var);
if (hist_field) {
if (var_name) {
hist_field = create_alias(hist_data, hist_field, var_name);
@@ -2857,7 +2863,7 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
/* we support only -(xxx) i.e. explicit parens required */
if (level > 3) {
- hist_err(HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
+ hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
ret = -EINVAL;
goto free;
}
@@ -2912,7 +2918,8 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
return ERR_PTR(ret);
}
-static int check_expr_operands(struct hist_field *operand1,
+static int check_expr_operands(struct trace_array *tr,
+ struct hist_field *operand1,
struct hist_field *operand2)
{
unsigned long operand1_flags = operand1->flags;
@@ -2940,7 +2947,7 @@ static int check_expr_operands(struct hist_field *operand1,
if ((operand1_flags & HIST_FIELD_FL_TIMESTAMP_USECS) !=
(operand2_flags & HIST_FIELD_FL_TIMESTAMP_USECS)) {
- hist_err(HIST_ERR_TIMESTAMP_MISMATCH, 0);
+ hist_err(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
return -EINVAL;
}
@@ -2958,7 +2965,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
char *sep, *operand1_str;
if (level > 3) {
- hist_err(HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
+ hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
return ERR_PTR(-EINVAL);
}
@@ -3003,7 +3010,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
goto free;
}
- ret = check_expr_operands(operand1, operand2);
+ ret = check_expr_operands(file->tr, operand1, operand2);
if (ret)
goto free;
@@ -3196,14 +3203,14 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
int ret;
if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
- hist_err(HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
+ hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
return ERR_PTR(-EINVAL);
}
file = event_file(tr, subsys_name, event_name);
if (IS_ERR(file)) {
- hist_err(HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
+ hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
ret = PTR_ERR(file);
return ERR_PTR(ret);
}
@@ -3216,7 +3223,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
*/
hist_data = find_compatible_hist(target_hist_data, file);
if (!hist_data) {
- hist_err(HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
+ hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@@ -3277,7 +3284,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
kfree(cmd);
kfree(var_hist->cmd);
kfree(var_hist);
- hist_err(HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
+ hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
return ERR_PTR(ret);
}
@@ -3289,7 +3296,7 @@ create_field_var_hist(struct hist_trigger_data *target_hist_data,
if (IS_ERR_OR_NULL(event_var)) {
kfree(var_hist->cmd);
kfree(var_hist);
- hist_err(HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
+ hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@@ -3422,25 +3429,26 @@ static struct field_var *create_field_var(struct hist_trigger_data *hist_data,
{
struct hist_field *val = NULL, *var = NULL;
unsigned long flags = HIST_FIELD_FL_VAR;
+ struct trace_array *tr = file->tr;
struct field_var *field_var;
int ret = 0;
if (hist_data->n_field_vars >= SYNTH_FIELDS_MAX) {
- hist_err(HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
+ hist_err(tr, HIST_ERR_TOO_MANY_FIELD_VARS, errpos(field_name));
ret = -EINVAL;
goto err;
}
val = parse_atom(hist_data, file, field_name, &flags, NULL);
if (IS_ERR(val)) {
- hist_err(HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
+ hist_err(tr, HIST_ERR_FIELD_VAR_PARSE_FAIL, errpos(field_name));
ret = PTR_ERR(val);
goto err;
}
var = create_var(hist_data, file, field_name, val->size, val->type);
if (IS_ERR(var)) {
- hist_err(HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
+ hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
kfree(val);
ret = PTR_ERR(var);
goto err;
@@ -3767,19 +3775,20 @@ static int track_data_create(struct hist_trigger_data *hist_data,
{
struct hist_field *var_field, *ref_field, *track_var = NULL;
struct trace_event_file *file = hist_data->event_file;
+ struct trace_array *tr = file->tr;
char *track_data_var_str;
int ret = 0;
track_data_var_str = data->track_data.var_str;
if (track_data_var_str[0] != '$') {
- hist_err(HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
+ hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
return -EINVAL;
}
track_data_var_str++;
var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
if (!var_field) {
- hist_err(HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
+ hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
return -EINVAL;
}
@@ -3792,7 +3801,7 @@ static int track_data_create(struct hist_trigger_data *hist_data,
if (data->handler == HANDLER_ONMAX)
track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
if (IS_ERR(track_var)) {
- hist_err(HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
+ hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
ret = PTR_ERR(track_var);
goto out;
}
@@ -3800,7 +3809,7 @@ static int track_data_create(struct hist_trigger_data *hist_data,
if (data->handler == HANDLER_ONCHANGE)
track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
if (IS_ERR(track_var)) {
- hist_err(HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
+ hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
ret = PTR_ERR(track_var);
goto out;
}
@@ -3811,7 +3820,8 @@ static int track_data_create(struct hist_trigger_data *hist_data,
return ret;
}
-static int parse_action_params(char *params, struct action_data *data)
+static int parse_action_params(struct trace_array *tr, char *params,
+ struct action_data *data)
{
char *param, *saved_param;
bool first_param = true;
@@ -3819,20 +3829,20 @@ static int parse_action_params(char *params, struct action_data *data)
while (params) {
if (data->n_params >= SYNTH_FIELDS_MAX) {
- hist_err(HIST_ERR_TOO_MANY_PARAMS, 0);
+ hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
goto out;
}
param = strsep(¶ms, ",");
if (!param) {
- hist_err(HIST_ERR_PARAM_NOT_FOUND, 0);
+ hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
param = strstrip(param);
if (strlen(param) < 2) {
- hist_err(HIST_ERR_INVALID_PARAM, errpos(param));
+ hist_err(tr, HIST_ERR_INVALID_PARAM, errpos(param));
ret = -EINVAL;
goto out;
}
@@ -3856,7 +3866,7 @@ static int parse_action_params(char *params, struct action_data *data)
return ret;
}
-static int action_parse(char *str, struct action_data *data,
+static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
enum handler_id handler)
{
char *action_name;
@@ -3864,14 +3874,14 @@ static int action_parse(char *str, struct action_data *data,
strsep(&str, ".");
if (!str) {
- hist_err(HIST_ERR_ACTION_NOT_FOUND, 0);
+ hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
action_name = strsep(&str, "(");
if (!action_name || !str) {
- hist_err(HIST_ERR_ACTION_NOT_FOUND, 0);
+ hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
ret = -EINVAL;
goto out;
}
@@ -3880,12 +3890,12 @@ static int action_parse(char *str, struct action_data *data,
char *params = strsep(&str, ")");
if (!params) {
- hist_err(HIST_ERR_NO_SAVE_PARAMS, 0);
+ hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
ret = -EINVAL;
goto out;
}
- ret = parse_action_params(params, data);
+ ret = parse_action_params(tr, params, data);
if (ret)
goto out;
@@ -3894,7 +3904,7 @@ static int action_parse(char *str, struct action_data *data,
else if (handler == HANDLER_ONCHANGE)
data->track_data.check_val = check_track_val_changed;
else {
- hist_err(HIST_ERR_ACTION_MISMATCH, errpos(action_name));
+ hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
ret = -EINVAL;
goto out;
}
@@ -3906,7 +3916,7 @@ static int action_parse(char *str, struct action_data *data,
char *params = strsep(&str, ")");
if (!str) {
- hist_err(HIST_ERR_NO_CLOSING_PAREN, errpos(params));
+ hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
ret = -EINVAL;
goto out;
}
@@ -3916,7 +3926,7 @@ static int action_parse(char *str, struct action_data *data,
else if (handler == HANDLER_ONCHANGE)
data->track_data.check_val = check_track_val_changed;
else {
- hist_err(HIST_ERR_ACTION_MISMATCH, errpos(action_name));
+ hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
ret = -EINVAL;
goto out;
}
@@ -3931,7 +3941,7 @@ static int action_parse(char *str, struct action_data *data,
data->use_trace_keyword = true;
if (params) {
- ret = parse_action_params(params, data);
+ ret = parse_action_params(tr, params, data);
if (ret)
goto out;
}
@@ -3984,7 +3994,7 @@ static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
goto free;
}
- ret = action_parse(str, data, handler);
+ ret = action_parse(hist_data->event_file->tr, str, data, handler);
if (ret)
goto free;
out:
@@ -4054,6 +4064,7 @@ trace_action_find_var(struct hist_trigger_data *hist_data,
struct action_data *data,
char *system, char *event, char *var)
{
+ struct trace_array *tr = hist_data->event_file->tr;
struct hist_field *hist_field;
var++; /* skip '$' */
@@ -4069,7 +4080,7 @@ trace_action_find_var(struct hist_trigger_data *hist_data,
}
if (!hist_field)
- hist_err(HIST_ERR_PARAM_NOT_FOUND, errpos(var));
+ hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
return hist_field;
}
@@ -4127,6 +4138,7 @@ trace_action_create_field_var(struct hist_trigger_data *hist_data,
static int trace_action_create(struct hist_trigger_data *hist_data,
struct action_data *data)
{
+ struct trace_array *tr = hist_data->event_file->tr;
char *event_name, *param, *system = NULL;
struct hist_field *hist_field, *var_ref;
unsigned int i, var_ref_idx;
@@ -4144,7 +4156,7 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
event = find_synth_event(synth_event_name);
if (!event) {
- hist_err(HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
+ hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
return -EINVAL;
}
@@ -4205,14 +4217,14 @@ static int trace_action_create(struct hist_trigger_data *hist_data,
continue;
}
- hist_err(HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
+ hist_err(tr, HIST_ERR_SYNTH_TYPE_MISMATCH, errpos(param));
kfree(p);
ret = -EINVAL;
goto err;
}
if (field_pos != event->n_fields) {
- hist_err(HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
+ hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
ret = -EINVAL;
goto err;
}
@@ -4231,6 +4243,7 @@ static int action_create(struct hist_trigger_data *hist_data,
struct action_data *data)
{
struct trace_event_file *file = hist_data->event_file;
+ struct trace_array *tr = file->tr;
struct track_data *track_data;
struct field_var *field_var;
unsigned int i;
@@ -4258,7 +4271,7 @@ static int action_create(struct hist_trigger_data *hist_data,
if (data->action == ACTION_SAVE) {
if (hist_data->n_save_vars) {
ret = -EEXIST;
- hist_err(HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
+ hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
goto out;
}
@@ -4271,7 +4284,8 @@ static int action_create(struct hist_trigger_data *hist_data,
field_var = create_target_field_var(hist_data, NULL, NULL, param);
if (IS_ERR(field_var)) {
- hist_err(HIST_ERR_FIELD_VAR_CREATE_FAIL, errpos(param));
+ hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
+ errpos(param));
ret = PTR_ERR(field_var);
kfree(param);
goto out;
@@ -4305,18 +4319,18 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
match_event = strsep(&str, ")");
if (!match_event || !str) {
- hist_err(HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
+ hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(match_event));
goto free;
}
match_event_system = strsep(&match_event, ".");
if (!match_event) {
- hist_err(HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
+ hist_err(tr, HIST_ERR_SUBSYS_NOT_FOUND, errpos(match_event_system));
goto free;
}
if (IS_ERR(event_file(tr, match_event_system, match_event))) {
- hist_err(HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
+ hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
goto free;
}
@@ -4332,7 +4346,7 @@ static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
goto free;
}
- ret = action_parse(str, data, HANDLER_ONMATCH);
+ ret = action_parse(tr, str, data, HANDLER_ONMATCH);
if (ret)
goto free;
out:
@@ -4401,13 +4415,14 @@ static int create_var_field(struct hist_trigger_data *hist_data,
struct trace_event_file *file,
char *var_name, char *expr_str)
{
+ struct trace_array *tr = hist_data->event_file->tr;
unsigned long flags = 0;
if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX + TRACING_MAP_VARS_MAX))
return -EINVAL;
if (find_var(hist_data, file, var_name) && !hist_data->remove) {
- hist_err(HIST_ERR_DUPLICATE_VAR, errpos(var_name));
+ hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
return -EINVAL;
}
@@ -4464,8 +4479,8 @@ static int create_key_field(struct hist_trigger_data *hist_data,
struct trace_event_file *file,
char *field_str)
{
+ struct trace_array *tr = hist_data->event_file->tr;
struct hist_field *hist_field = NULL;
-
unsigned long flags = 0;
unsigned int key_size;
int ret = 0;
@@ -4488,7 +4503,7 @@ static int create_key_field(struct hist_trigger_data *hist_data,
}
if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
- hist_err(HIST_ERR_INVALID_REF_KEY, errpos(field_str));
+ hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
destroy_hist_field(hist_field, 0);
ret = -EINVAL;
goto out;
@@ -4589,6 +4604,7 @@ static void free_var_defs(struct hist_trigger_data *hist_data)
static int parse_var_defs(struct hist_trigger_data *hist_data)
{
+ struct trace_array *tr = hist_data->event_file->tr;
char *s, *str, *var_name, *field_str;
unsigned int i, j, n_vars = 0;
int ret = 0;
@@ -4602,13 +4618,14 @@ static int parse_var_defs(struct hist_trigger_data *hist_data)
var_name = strsep(&field_str, "=");
if (!var_name || !field_str) {
- hist_err(HIST_ERR_MALFORMED_ASSIGNMENT, errpos(var_name));
+ hist_err(tr, HIST_ERR_MALFORMED_ASSIGNMENT,
+ errpos(var_name));
ret = -EINVAL;
goto free;
}
if (n_vars == TRACING_MAP_VARS_MAX) {
- hist_err(HIST_ERR_TOO_MANY_VARS, errpos(var_name));
+ hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
ret = -EINVAL;
goto free;
}
@@ -5829,6 +5846,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
{
struct hist_trigger_data *hist_data = data->private_data;
struct event_trigger_data *test, *named_data = NULL;
+ struct trace_array *tr = file->tr;
int ret = 0;
if (hist_data->attrs->name) {
@@ -5836,7 +5854,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
if (named_data) {
if (!hist_trigger_match(data, named_data, named_data,
true)) {
- hist_err(HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
+ hist_err(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
ret = -EINVAL;
goto out;
}
@@ -5857,7 +5875,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
else if (hist_data->attrs->clear)
hist_clear(test);
else {
- hist_err(HIST_ERR_TRIGGER_EEXIST, 0);
+ hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
ret = -EEXIST;
}
goto out;
@@ -5865,7 +5883,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
}
new:
if (hist_data->attrs->cont || hist_data->attrs->clear) {
- hist_err(HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
+ hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
ret = -ENOENT;
goto out;
}
@@ -5890,7 +5908,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
if (ret) {
- hist_err(HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
+ hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
goto out;
}
@@ -6108,7 +6126,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
trigger = strstrip(trigger);
}
- attrs = parse_hist_trigger_attrs(trigger);
+ attrs = parse_hist_trigger_attrs(file->tr, trigger);
if (IS_ERR(attrs))
return PTR_ERR(attrs);
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 10/19] tracing: Have the error logs show up in the proper instances
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (7 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 09/19] tracing: Have histogram code pass around trace_array for error handling Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 11/19] selftests/ftrace: Add error_log testcase for probe errors Steven Rostedt
` (8 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Tom Zanussi
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
As each instance has their own error_log file, it makes more sense that the
instances show the errors of their own instead of all error_logs having the
same data. Make it that the errors show up in the instance error_log file
that the error happens in. If no instance trace_array is available, then
NULL can be passed in which will create the error in the top level instance
(the one at the top of the tracefs directory).
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace.c | 55 ++++++++++++++++++++----------
kernel/trace/trace.h | 5 ++-
kernel/trace/trace_events_filter.c | 4 +--
kernel/trace/trace_events_hist.c | 3 +-
kernel/trace/trace_probe.c | 2 +-
5 files changed, 46 insertions(+), 23 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 7978168f5041..3d55e9daae8c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -6897,25 +6897,22 @@ struct tracing_log_err {
char cmd[MAX_FILTER_STR_VAL]; /* what caused err */
};
-static LIST_HEAD(tracing_err_log);
static DEFINE_MUTEX(tracing_err_log_lock);
-static unsigned int n_tracing_err_log_entries;
-
-struct tracing_log_err *get_tracing_log_err(void)
+struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)
{
struct tracing_log_err *err;
- if (n_tracing_err_log_entries < TRACING_LOG_ERRS_MAX) {
+ if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) {
err = kzalloc(sizeof(*err), GFP_KERNEL);
if (!err)
err = ERR_PTR(-ENOMEM);
- n_tracing_err_log_entries++;
+ tr->n_err_log_entries++;
return err;
}
- err = list_first_entry(&tracing_err_log, struct tracing_log_err, list);
+ err = list_first_entry(&tr->err_log, struct tracing_log_err, list);
list_del(&err->list);
return err;
@@ -6949,6 +6946,7 @@ unsigned int err_pos(char *cmd, const char *str)
/**
* tracing_log_err - write an error to the tracing error log
+ * @tr: The associated trace array for the error (NULL for top level array)
* @loc: A string describing where the error occurred
* @cmd: The tracing command that caused the error
* @errs: The array of loc-specific static error strings
@@ -6973,13 +6971,17 @@ unsigned int err_pos(char *cmd, const char *str)
* existing callers for examples of how static strings are typically
* defined for use with tracing_log_err().
*/
-void tracing_log_err(const char *loc, const char *cmd,
+void tracing_log_err(struct trace_array *tr,
+ const char *loc, const char *cmd,
const char **errs, u8 type, u8 pos)
{
struct tracing_log_err *err;
+ if (!tr)
+ tr = &global_trace;
+
mutex_lock(&tracing_err_log_lock);
- err = get_tracing_log_err();
+ err = get_tracing_log_err(tr);
if (PTR_ERR(err) == -ENOMEM) {
mutex_unlock(&tracing_err_log_lock);
return;
@@ -6993,34 +6995,38 @@ void tracing_log_err(const char *loc, const char *cmd,
err->info.pos = pos;
err->info.ts = local_clock();
- list_add_tail(&err->list, &tracing_err_log);
+ list_add_tail(&err->list, &tr->err_log);
mutex_unlock(&tracing_err_log_lock);
}
-static void clear_tracing_err_log(void)
+static void clear_tracing_err_log(struct trace_array *tr)
{
struct tracing_log_err *err, *next;
mutex_lock(&tracing_err_log_lock);
- list_for_each_entry_safe(err, next, &tracing_err_log, list) {
+ list_for_each_entry_safe(err, next, &tr->err_log, list) {
list_del(&err->list);
kfree(err);
}
- n_tracing_err_log_entries = 0;
+ tr->n_err_log_entries = 0;
mutex_unlock(&tracing_err_log_lock);
}
static void *tracing_err_log_seq_start(struct seq_file *m, loff_t *pos)
{
+ struct trace_array *tr = m->private;
+
mutex_lock(&tracing_err_log_lock);
- return seq_list_start(&tracing_err_log, *pos);
+ return seq_list_start(&tr->err_log, *pos);
}
static void *tracing_err_log_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
- return seq_list_next(v, &tracing_err_log, pos);
+ struct trace_array *tr = m->private;
+
+ return seq_list_next(v, &tr->err_log, pos);
}
static void tracing_err_log_seq_stop(struct seq_file *m, void *v)
@@ -7067,15 +7073,25 @@ static const struct seq_operations tracing_err_log_seq_ops = {
static int tracing_err_log_open(struct inode *inode, struct file *file)
{
+ struct trace_array *tr = inode->i_private;
int ret = 0;
+ if (trace_array_get(tr) < 0)
+ return -ENODEV;
+
/* If this file was opened for write, then erase contents */
if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC))
- clear_tracing_err_log();
+ clear_tracing_err_log(tr);
- if (file->f_mode & FMODE_READ)
+ if (file->f_mode & FMODE_READ) {
ret = seq_open(file, &tracing_err_log_seq_ops);
-
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ m->private = tr;
+ } else {
+ trace_array_put(tr);
+ }
+ }
return ret;
}
@@ -7091,6 +7107,7 @@ static const struct file_operations tracing_err_log_fops = {
.write = tracing_err_log_write,
.read = seq_read,
.llseek = seq_lseek,
+ .release = tracing_release_generic_tr,
};
static int tracing_buffers_open(struct inode *inode, struct file *filp)
@@ -8293,6 +8310,7 @@ struct trace_array *trace_array_create(const char *name)
INIT_LIST_HEAD(&tr->systems);
INIT_LIST_HEAD(&tr->events);
INIT_LIST_HEAD(&tr->hist_vars);
+ INIT_LIST_HEAD(&tr->err_log);
if (allocate_trace_buffers(tr, trace_buf_size) < 0)
goto out_free_tr;
@@ -9087,6 +9105,7 @@ __init static int tracer_alloc_buffers(void)
INIT_LIST_HEAD(&global_trace.systems);
INIT_LIST_HEAD(&global_trace.events);
INIT_LIST_HEAD(&global_trace.hist_vars);
+ INIT_LIST_HEAD(&global_trace.err_log);
list_add(&global_trace.list, &ftrace_trace_arrays);
apply_trace_boot_options();
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 809c5d7f0064..da00a3d508c1 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -293,11 +293,13 @@ struct trace_array {
int nr_topts;
bool clear_trace;
int buffer_percent;
+ unsigned int n_err_log_entries;
struct tracer *current_trace;
unsigned int trace_flags;
unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
unsigned int flags;
raw_spinlock_t start_lock;
+ struct list_head err_log;
struct dentry *dir;
struct dentry *options;
struct dentry *percpu_dir;
@@ -1886,7 +1888,8 @@ extern ssize_t trace_parse_run_command(struct file *file,
int (*createfn)(int, char**));
extern unsigned int err_pos(char *cmd, const char *str);
-extern void tracing_log_err(const char *loc, const char *cmd,
+extern void tracing_log_err(struct trace_array *tr,
+ const char *loc, const char *cmd,
const char **errs, u8 type, u8 pos);
/*
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 2b63930cd3e6..180ecb390baa 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -949,12 +949,12 @@ static void append_filter_err(struct trace_array *tr,
if (pe->lasterr > 0) {
trace_seq_printf(s, "\n%*s", pos, "^");
trace_seq_printf(s, "\nparse_error: %s\n", err_text[pe->lasterr]);
- tracing_log_err("event filter parse error",
+ tracing_log_err(tr, "event filter parse error",
filter->filter_string, err_text,
pe->lasterr, pe->lasterr_pos);
} else {
trace_seq_printf(s, "\nError: (%d)\n", pe->lasterr);
- tracing_log_err("event filter parse error",
+ tracing_log_err(tr, "event filter parse error",
filter->filter_string, err_text,
FILT_ERR_ERRNO, 0);
}
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index a167e439e9a1..a1136e043f17 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -621,7 +621,8 @@ static void last_cmd_set(struct trace_event_file *file, char *str)
static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
{
- tracing_log_err(last_cmd_loc, last_cmd, err_text, err_type, err_pos);
+ tracing_log_err(tr, last_cmd_loc, last_cmd, err_text,
+ err_type, err_pos);
}
static void hist_err_clear(void)
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index e11f98c49d72..4cc2d467d34c 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -186,7 +186,7 @@ void __trace_probe_log_err(int offset, int err_type)
}
*(p - 1) = '\0';
- tracing_log_err(trace_probe_log.subsystem, command,
+ tracing_log_err(NULL, trace_probe_log.subsystem, command,
trace_probe_err_text, err_type, pos + offset);
kfree(command);
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 11/19] selftests/ftrace: Add error_log testcase for probe errors
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (8 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 10/19] tracing: Have the error logs show up in the proper instances Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 12/19] selftests/ftrace: Move kprobe/uprobe check_error() to test.d/functions Steven Rostedt
` (7 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Namhyung Kim, Masami Hiramatsu, Tom Zanussi
From: Masami Hiramatsu <mhiramat@kernel.org>
Add error_log testcase for error logs on probe events.
This tests most of error cases and checks the error position
is correct.
Link: http://lkml.kernel.org/r/63d695b74e0965988fa54ffa12beeb2c3475250d.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[tom.zanussi@linux.intel.com: changed >& redirection to 2>]
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
.../test.d/kprobe/kprobe_syntax_errors.tc | 93 +++++++++++++++++++
.../test.d/kprobe/uprobe_syntax_errors.tc | 31 +++++++
2 files changed, 124 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
new file mode 100644
index 000000000000..7eb577b1d222
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
@@ -0,0 +1,93 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Kprobe event parser error log check
+
+[ -f kprobe_events ] || exit_unsupported # this is configurable
+
+[ -f error_log ] || exit_unsupported
+
+check_error() { # command-with-error-pos-by-^
+pos=$(echo -n "${1%^*}" | wc -c) # error position
+command=$(echo "$1" | tr -d ^)
+echo "Test command: $command"
+echo > error_log
+(! echo "$command" > kprobe_events ) 2> /dev/null
+grep "trace_kprobe: error:" -A 3 error_log
+N=$(tail -n 1 error_log | wc -c)
+# " Command: " and "^\n" => 13
+test $(expr 13 + $pos) -eq $N
+}
+
+if grep -q 'r\[maxactive\]' README; then
+check_error 'p^100 vfs_read' # MAXACT_NO_KPROBE
+check_error 'r^1a111 vfs_read' # BAD_MAXACT
+check_error 'r^100000 vfs_read' # MAXACT_TOO_BIG
+fi
+
+check_error 'p ^non_exist_func' # BAD_PROBE_ADDR (enoent)
+check_error 'p ^hoge-fuga' # BAD_PROBE_ADDR (bad syntax)
+check_error 'p ^hoge+1000-1000' # BAD_PROBE_ADDR (bad syntax)
+check_error 'r ^vfs_read+10' # BAD_RETPROBE
+check_error 'p:^/bar vfs_read' # NO_GROUP_NAME
+check_error 'p:^12345678901234567890123456789012345678901234567890123456789012345/bar vfs_read' # GROUP_TOO_LONG
+
+check_error 'p:^foo.1/bar vfs_read' # BAD_GROUP_NAME
+check_error 'p:foo/^ vfs_read' # NO_EVENT_NAME
+check_error 'p:foo/^12345678901234567890123456789012345678901234567890123456789012345 vfs_read' # EVENT_TOO_LONG
+check_error 'p:foo/^bar.1 vfs_read' # BAD_EVENT_NAME
+
+check_error 'p vfs_read ^$retval' # RETVAL_ON_PROBE
+check_error 'p vfs_read ^$stack10000' # BAD_STACK_NUM
+
+if grep -q '$arg<N>' README; then
+check_error 'p vfs_read ^$arg10000' # BAD_ARG_NUM
+fi
+
+check_error 'p vfs_read ^$none_var' # BAD_VAR
+
+check_error 'p vfs_read ^%none_reg' # BAD_REG_NAME
+check_error 'p vfs_read ^@12345678abcde' # BAD_MEM_ADDR
+check_error 'p vfs_read ^@+10' # FILE_ON_KPROBE
+
+check_error 'p vfs_read ^+0@0)' # DEREF_NEED_BRACE
+check_error 'p vfs_read ^+0ab1(@0)' # BAD_DEREF_OFFS
+check_error 'p vfs_read +0(+0(@0^)' # DEREF_OPEN_BRACE
+
+if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
+check_error 'p vfs_read +0(^$comm)' # COMM_CANT_DEREF
+fi
+
+check_error 'p vfs_read ^&1' # BAD_FETCH_ARG
+
+
+# We've introduced this limitation with array support
+if grep -q ' <type>\\\[<array-size>\\\]' README; then
+check_error 'p vfs_read +0(^+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(@0))))))))))))))' # TOO_MANY_OPS?
+check_error 'p vfs_read +0(@11):u8[10^' # ARRAY_NO_CLOSE
+check_error 'p vfs_read +0(@11):u8[10]^a' # BAD_ARRAY_SUFFIX
+check_error 'p vfs_read +0(@11):u8[^10a]' # BAD_ARRAY_NUM
+check_error 'p vfs_read +0(@11):u8[^256]' # ARRAY_TOO_BIG
+fi
+
+check_error 'p vfs_read @11:^unknown_type' # BAD_TYPE
+check_error 'p vfs_read $stack0:^string' # BAD_STRING
+check_error 'p vfs_read @11:^b10@a/16' # BAD_BITFIELD
+
+check_error 'p vfs_read ^arg123456789012345678901234567890=@11' # ARG_NAME_TOO_LOG
+check_error 'p vfs_read ^=@11' # NO_ARG_NAME
+check_error 'p vfs_read ^var.1=@11' # BAD_ARG_NAME
+check_error 'p vfs_read var1=@11 ^var1=@12' # USED_ARG_NAME
+check_error 'p vfs_read ^+1234567(+1234567(+1234567(+1234567(+1234567(+1234567(@1234))))))' # ARG_TOO_LONG
+check_error 'p vfs_read arg1=^' # NO_ARG_BODY
+
+# instruction boundary check is valid on x86 (at this moment)
+case $(uname -m) in
+ x86_64|i[3456]86)
+ echo 'p vfs_read' > kprobe_events
+ if grep -q FTRACE ../kprobes/list ; then
+ check_error 'p ^vfs_read+3' # BAD_INSN_BNDRY (only if function-tracer is enabled)
+ fi
+ ;;
+esac
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
new file mode 100644
index 000000000000..ec7389b7934b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
@@ -0,0 +1,31 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Uprobe event parser error log check
+
+[ -f uprobe_events ] || exit_unsupported # this is configurable
+
+[ -f error_log ] || exit_unsupported
+
+check_error() { # command-with-error-pos-by-^
+pos=$(echo -n "${1%^*}" | wc -c) # error position
+command=$(echo "$1" | tr -d ^)
+echo "Test command: $command"
+echo > error_log
+(! echo "$command" > uprobe_events ) 2> /dev/null
+grep "trace_uprobe: error:" -A 3 error_log
+N=$(tail -n 1 error_log | wc -c)
+# " Command: " and "^\n" => 13
+test $(expr 13 + $pos) -eq $N
+}
+
+check_error 'p ^/non_exist_file:100' # FILE_NOT_FOUND
+check_error 'p ^/sys:100' # NO_REGULAR_FILE
+check_error 'p /bin/sh:^10a' # BAD_UPROBE_OFFS
+check_error 'p /bin/sh:10(^1a)' # BAD_REFCNT
+check_error 'p /bin/sh:10(10^' # REFCNT_OPEN_BRACE
+check_error 'p /bin/sh:10(10)^a' # BAD_REFCNT_SUFFIX
+
+check_error 'p /bin/sh:10 ^@+ab' # BAD_FILE_OFFS
+check_error 'p /bin/sh:10 ^@symbol' # SYM_ON_UPROBE
+
+exit 0
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 12/19] selftests/ftrace: Move kprobe/uprobe check_error() to test.d/functions
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (9 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 11/19] selftests/ftrace: Add error_log testcase for probe errors Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 13/19] selftests/ftrace: Remove trigger-extended-error-support testcase Steven Rostedt
` (6 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
The k/uprobe_sytax_errors test case defines a check_error() function
used to run a command and check the position of the caret in the
output.
This would be useful for other ftrace facilities too, so move it to
test.d/functions for use by anyone. In the process, rename it to
ftrace_errlog_check() and parametrize it for general use.
Link: http://lkml.kernel.org/r/9f88080a06f1755811f69081926afe7e5cb53178.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
tools/testing/selftests/ftrace/test.d/functions | 12 ++++++++++++
.../ftrace/test.d/kprobe/kprobe_syntax_errors.tc | 10 +---------
.../ftrace/test.d/kprobe/uprobe_syntax_errors.tc | 10 +---------
3 files changed, 14 insertions(+), 18 deletions(-)
diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
index 7b96e80e6b8a..779ec11f61bd 100644
--- a/tools/testing/selftests/ftrace/test.d/functions
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -109,3 +109,15 @@ LOCALHOST=127.0.0.1
yield() {
ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1
}
+
+ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
+ pos=$(echo -n "${2%^*}" | wc -c) # error position
+ command=$(echo "$2" | tr -d ^)
+ echo "Test command: $command"
+ echo > error_log
+ (! echo "$command" > "$3" ) 2> /dev/null
+ grep "$1: error:" -A 3 error_log
+ N=$(tail -n 1 error_log | wc -c)
+ # " Command: " and "^\n" => 13
+ test $(expr 13 + $pos) -eq $N
+}
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
index 7eb577b1d222..29faaec942c6 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
@@ -7,15 +7,7 @@
[ -f error_log ] || exit_unsupported
check_error() { # command-with-error-pos-by-^
-pos=$(echo -n "${1%^*}" | wc -c) # error position
-command=$(echo "$1" | tr -d ^)
-echo "Test command: $command"
-echo > error_log
-(! echo "$command" > kprobe_events ) 2> /dev/null
-grep "trace_kprobe: error:" -A 3 error_log
-N=$(tail -n 1 error_log | wc -c)
-# " Command: " and "^\n" => 13
-test $(expr 13 + $pos) -eq $N
+ ftrace_errlog_check 'trace_kprobe' "$1" 'kprobe_events'
}
if grep -q 'r\[maxactive\]' README; then
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
index ec7389b7934b..14229d5778a0 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
@@ -7,15 +7,7 @@
[ -f error_log ] || exit_unsupported
check_error() { # command-with-error-pos-by-^
-pos=$(echo -n "${1%^*}" | wc -c) # error position
-command=$(echo "$1" | tr -d ^)
-echo "Test command: $command"
-echo > error_log
-(! echo "$command" > uprobe_events ) 2> /dev/null
-grep "trace_uprobe: error:" -A 3 error_log
-N=$(tail -n 1 error_log | wc -c)
-# " Command: " and "^\n" => 13
-test $(expr 13 + $pos) -eq $N
+ ftrace_errlog_check 'trace_uprobe' "$1" 'uprobe_events'
}
check_error 'p ^/non_exist_file:100' # FILE_NOT_FOUND
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 13/19] selftests/ftrace: Remove trigger-extended-error-support testcase
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (10 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 12/19] selftests/ftrace: Move kprobe/uprobe check_error() to test.d/functions Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 14/19] selftests/ftrace: Add tracing/error_log testcase Steven Rostedt
` (5 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Error handling has been moved to the common tracing/error_log, so this
test is no longer valid.
Link: http://lkml.kernel.org/r/876a98b21018814cbf46f0a3605ae0906c51d53c.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
.../trigger-extended-error-support.tc | 28 -------------------
1 file changed, 28 deletions(-)
delete mode 100644 tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-extended-error-support.tc
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-extended-error-support.tc b/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-extended-error-support.tc
deleted file mode 100644
index 9912616a8672..000000000000
--- a/tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-extended-error-support.tc
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0
-# description: event trigger - test extended error support
-
-
-fail() { #msg
- echo $1
- exit_fail
-}
-
-if [ ! -f set_event ]; then
- echo "event tracing is not supported"
- exit_unsupported
-fi
-
-if [ ! -f synthetic_events ]; then
- echo "synthetic event is not supported"
- exit_unsupported
-fi
-
-echo "Test extended error support"
-echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' > events/sched/sched_wakeup/trigger
-! echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="ping"' >> events/sched/sched_wakeup/trigger 2> /dev/null
-if ! grep -q "ERROR:" events/sched/sched_wakeup/hist; then
- fail "Failed to generate extended error in histogram"
-fi
-
-exit 0
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 14/19] selftests/ftrace: Add tracing/error_log testcase
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (11 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 13/19] selftests/ftrace: Remove trigger-extended-error-support testcase Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 15/19] tracing: Add tracing/error_log Documentation Steven Rostedt
` (4 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Add a testcase verifying basic tracing/error_log functionality.
Link: http://lkml.kernel.org/r/bf1c0d47a24672df945331462682d96296d1ab28.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
.../ftrace/test.d/ftrace/tracing-error-log.tc | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc b/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
new file mode 100644
index 000000000000..021c03fd885d
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: ftrace - test tracing error log support
+
+fail() { #msg
+ echo $1
+ exit_fail
+}
+
+# event tracing is currently the only ftrace tracer that uses the
+# tracing error_log, hence this check
+if [ ! -f set_event ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+ftrace_errlog_check 'event filter parse error' '((sig >= 10 && sig < 15) || dsig ^== 17) && comm != bash' 'events/signal/signal_generate/filter'
+
+exit 0
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 15/19] tracing: Add tracing/error_log Documentation
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (12 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 14/19] selftests/ftrace: Add tracing/error_log testcase Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 16/19] tracing: Add error_log to README Steven Rostedt
` (3 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Move most of the hist trigger extended error documentation to
ftrace.rst and expand on it to fully document tracing/error_log.
Link: http://lkml.kernel.org/r/c5d53c8f643ef6844d6ad8d0200c116936730b01.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
Documentation/trace/ftrace.rst | 31 +++++++++++++++++++++++++++++++
Documentation/trace/histogram.rst | 16 ++--------------
2 files changed, 33 insertions(+), 14 deletions(-)
diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 7c5e6d6ab5d1..809b39d066ee 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -765,6 +765,37 @@ Here is the list of current tracers that may be configured.
tracers from tracing simply echo "nop" into
current_tracer.
+Error conditions
+----------------
+
+ For most ftrace commands, failure modes are obvious and communicated
+ using standard return codes.
+
+ For other more involved commands, extended error information may be
+ available via the tracing/error_log file. For the commands that
+ support it, reading the tracing/error_log file after an error will
+ display more detailed information about what went wrong, if
+ information is available. The tracing/error_log file is a circular
+ error log displaying a small number (currently, 8) of ftrace errors
+ for the last (8) failed commands.
+
+ The extended error information and usage takes the form shown in
+ this example::
+
+ # echo xxx > /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
+ echo: write error: Invalid argument
+
+ # cat /sys/kernel/debug/tracing/error_log
+ [ 5348.887237] location: error: Couldn't yyy: zzz
+ Command: xxx
+ ^
+ [ 7517.023364] location: error: Bad rrr: sss
+ Command: ppp qqq
+ ^
+
+ To clear the error log, echo the empty string into it::
+
+ # echo > /sys/kernel/debug/tracing/error_log
Examples of using the tracer
----------------------------
diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst
index 0ea59d45aef1..7612c7ad5715 100644
--- a/Documentation/trace/histogram.rst
+++ b/Documentation/trace/histogram.rst
@@ -199,20 +199,8 @@ Extended error information
For some error conditions encountered when invoking a hist trigger
command, extended error information is available via the
- corresponding event's 'hist' file. Reading the hist file after an
- error will display more detailed information about what went wrong,
- if information is available. This extended error information will
- be available until the next hist trigger command for that event.
-
- If available for a given error condition, the extended error
- information and usage takes the following form::
-
- # echo xxx > /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
- echo: write error: Invalid argument
-
- # cat /sys/kernel/debug/tracing/events/sched/sched_wakeup/hist
- ERROR: Couldn't yyy: zzz
- Last command: xxx
+ tracing/error_log file. See Error Conditions in
+ :file:`Documentation/trace/ftrace.rst` for details.
6.2 'hist' trigger examples
---------------------------
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 16/19] tracing: Add error_log to README
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (13 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 15/19] tracing: Add tracing/error_log Documentation Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 17/19] tracing: introduce TRACE_EVENT_NOP() Steven Rostedt
` (2 subsequent siblings)
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Masami Hiramatsu, Namhyung Kim, Tom Zanussi
From: Tom Zanussi <tom.zanussi@linux.intel.com>
Add brief blurb about error_log to the 'Important files' section.
Link: http://lkml.kernel.org/r/c81e60f9aded495081231a32d2d1023c4d043a7a.1554072478.git.tom.zanussi@linux.intel.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3d55e9daae8c..2bc18de7f0dc 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4702,6 +4702,7 @@ static const char readme_msg[] =
" trace_pipe\t\t- A consuming read to see the contents of the buffer\n"
" current_tracer\t- function and latency tracers\n"
" available_tracers\t- list of configured tracers for current_tracer\n"
+ " error_log\t- error log for failed commands (that support it)\n"
" buffer_size_kb\t- view and modify size of per cpu buffer\n"
" buffer_total_size_kb - view total size of all cpu buffers\n\n"
" trace_clock\t\t-change the clock used to order events\n"
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 17/19] tracing: introduce TRACE_EVENT_NOP()
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (14 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 16/19] tracing: Add error_log to README Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 18/19] sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 19/19] rcu: validate arguments for rcu tracepoints Steven Rostedt
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Yafang Shao
From: Yafang Shao <laoar.shao@gmail.com>
Sometimes we want to define a tracepoint as a do-nothing function.
So I introduce TRACE_EVENT_NOP, DECLARE_EVENT_CLASS_NOP and
DEFINE_EVENT_NOP for this kind of usage.
Link: http://lkml.kernel.org/r/1553602391-11926-2-git-send-email-laoar.shao@gmail.com
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/linux/tracepoint.h | 15 +++++++++++++++
include/trace/define_trace.h | 8 ++++++++
2 files changed, 23 insertions(+)
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 9c3186578ce0..86b019aa2839 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -548,4 +548,19 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
#define TRACE_EVENT_PERF_PERM(event, expr...)
+#define DECLARE_EVENT_NOP(name, proto, args) \
+ static inline void trace_##name(proto) \
+ { } \
+ static inline bool trace_##name##_enabled(void) \
+ { \
+ return false; \
+ }
+
+#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \
+ DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
+
+#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
+#define DEFINE_EVENT_NOP(template, name, proto, args) \
+ DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
+
#endif /* ifdef TRACE_EVENT (see note above) */
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index cb30c5532144..bd75f97867b9 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -46,6 +46,12 @@
assign, print, reg, unreg) \
DEFINE_TRACE_FN(name, reg, unreg)
+#undef TRACE_EVENT_NOP
+#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)
+
+#undef DEFINE_EVENT_NOP
+#define DEFINE_EVENT_NOP(template, name, proto, args)
+
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, name, proto, args) \
DEFINE_TRACE(name)
@@ -102,6 +108,8 @@
#undef TRACE_EVENT_FN
#undef TRACE_EVENT_FN_COND
#undef TRACE_EVENT_CONDITION
+#undef TRACE_EVENT_NOP
+#undef DEFINE_EVENT_NOP
#undef DECLARE_EVENT_CLASS
#undef DEFINE_EVENT
#undef DEFINE_EVENT_FN
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 18/19] sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (15 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 17/19] tracing: introduce TRACE_EVENT_NOP() Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
2019-04-04 1:37 ` [for-next][PATCH 19/19] rcu: validate arguments for rcu tracepoints Steven Rostedt
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Peter Zijlstra (Intel), Yafang Shao
From: Yafang Shao <laoar.shao@gmail.com>
The tracepoints trace_sched_stat_{iowait, blocked, wait, sleep} should
be not exposed to user if CONFIG_SCHEDSTATS is not set.
Link: http://lkml.kernel.org/r/1553602391-11926-3-git-send-email-laoar.shao@gmail.com
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/trace/events/sched.h | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9a4bdfadab07..c8c7c7efb487 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -241,7 +241,6 @@ DECLARE_EVENT_CLASS(sched_process_template,
DEFINE_EVENT(sched_process_template, sched_process_free,
TP_PROTO(struct task_struct *p),
TP_ARGS(p));
-
/*
* Tracepoint for a task exiting:
@@ -336,11 +335,20 @@ TRACE_EVENT(sched_process_exec,
__entry->pid, __entry->old_pid)
);
+
+#ifdef CONFIG_SCHEDSTATS
+#define DEFINE_EVENT_SCHEDSTAT DEFINE_EVENT
+#define DECLARE_EVENT_CLASS_SCHEDSTAT DECLARE_EVENT_CLASS
+#else
+#define DEFINE_EVENT_SCHEDSTAT DEFINE_EVENT_NOP
+#define DECLARE_EVENT_CLASS_SCHEDSTAT DECLARE_EVENT_CLASS_NOP
+#endif
+
/*
* XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
* adding sched_stat support to SCHED_FIFO/RR would be welcome.
*/
-DECLARE_EVENT_CLASS(sched_stat_template,
+DECLARE_EVENT_CLASS_SCHEDSTAT(sched_stat_template,
TP_PROTO(struct task_struct *tsk, u64 delay),
@@ -363,12 +371,11 @@ DECLARE_EVENT_CLASS(sched_stat_template,
(unsigned long long)__entry->delay)
);
-
/*
* Tracepoint for accounting wait time (time the task is runnable
* but not actually running due to scheduler contention).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_wait,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_wait,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
@@ -376,7 +383,7 @@ DEFINE_EVENT(sched_stat_template, sched_stat_wait,
* Tracepoint for accounting sleep time (time the task is not runnable,
* including iowait, see below).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_sleep,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_sleep,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
@@ -384,14 +391,14 @@ DEFINE_EVENT(sched_stat_template, sched_stat_sleep,
* Tracepoint for accounting iowait time (time the task is not runnable
* due to waiting on IO to complete).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_iowait,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_iowait,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
/*
* Tracepoint for accounting blocked time (time the task is in uninterruptible).
*/
-DEFINE_EVENT(sched_stat_template, sched_stat_blocked,
+DEFINE_EVENT_SCHEDSTAT(sched_stat_template, sched_stat_blocked,
TP_PROTO(struct task_struct *tsk, u64 delay),
TP_ARGS(tsk, delay));
--
2.20.1
^ permalink raw reply related [flat|nested] 19+ messages in thread* [for-next][PATCH 19/19] rcu: validate arguments for rcu tracepoints
2019-04-04 1:37 [for-next][PATCH 00/19] tracing: Updates for 5.2 Steven Rostedt
` (16 preceding siblings ...)
2019-04-04 1:37 ` [for-next][PATCH 18/19] sched/fair: do not expose some tracepoints to user if CONFIG_SCHEDSTATS is not set Steven Rostedt
@ 2019-04-04 1:37 ` Steven Rostedt
17 siblings, 0 replies; 19+ messages in thread
From: Steven Rostedt @ 2019-04-04 1:37 UTC (permalink / raw)
To: linux-kernel; +Cc: Ingo Molnar, Andrew Morton, Paul E. McKenney, Yafang Shao
From: Yafang Shao <laoar.shao@gmail.com>
When CONFIG_RCU_TRACE is not set, all these tracepoints are defined as
do-nothing macro.
We'd better make those inline functions that take proper arguments.
As RCU_TRACE() is defined as do-nothing marco as well when
CONFIG_RCU_TRACE is not set, so we can clean it up.
Link: http://lkml.kernel.org/r/1553602391-11926-4-git-send-email-laoar.shao@gmail.com
Reviewed-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/trace/events/rcu.h | 81 ++++++++++++--------------------------
kernel/rcu/rcu.h | 9 +----
kernel/rcu/tree.c | 8 ++--
3 files changed, 31 insertions(+), 67 deletions(-)
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index f0c4d10e614b..e3f357b89432 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -7,6 +7,12 @@
#include <linux/tracepoint.h>
+#ifdef CONFIG_RCU_TRACE
+#define TRACE_EVENT_RCU TRACE_EVENT
+#else
+#define TRACE_EVENT_RCU TRACE_EVENT_NOP
+#endif
+
/*
* Tracepoint for start/end markers used for utilization calculations.
* By convention, the string is of the following forms:
@@ -35,8 +41,6 @@ TRACE_EVENT(rcu_utilization,
TP_printk("%s", __entry->s)
);
-#ifdef CONFIG_RCU_TRACE
-
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
/*
@@ -62,7 +66,7 @@ TRACE_EVENT(rcu_utilization,
* "end": End a grace period.
* "cpuend": CPU first notices a grace-period end.
*/
-TRACE_EVENT(rcu_grace_period,
+TRACE_EVENT_RCU(rcu_grace_period,
TP_PROTO(const char *rcuname, unsigned long gp_seq, const char *gpevent),
@@ -101,7 +105,7 @@ TRACE_EVENT(rcu_grace_period,
* "Cleanup": Clean up rcu_node structure after previous GP.
* "CleanupMore": Clean up, and another GP is needed.
*/
-TRACE_EVENT(rcu_future_grace_period,
+TRACE_EVENT_RCU(rcu_future_grace_period,
TP_PROTO(const char *rcuname, unsigned long gp_seq,
unsigned long gp_seq_req, u8 level, int grplo, int grphi,
@@ -141,7 +145,7 @@ TRACE_EVENT(rcu_future_grace_period,
* rcu_node structure, and the mask of CPUs that will be waited for.
* All but the type of RCU are extracted from the rcu_node structure.
*/
-TRACE_EVENT(rcu_grace_period_init,
+TRACE_EVENT_RCU(rcu_grace_period_init,
TP_PROTO(const char *rcuname, unsigned long gp_seq, u8 level,
int grplo, int grphi, unsigned long qsmask),
@@ -186,7 +190,7 @@ TRACE_EVENT(rcu_grace_period_init,
* "endwake": Woke piggybackers up.
* "done": Someone else did the expedited grace period for us.
*/
-TRACE_EVENT(rcu_exp_grace_period,
+TRACE_EVENT_RCU(rcu_exp_grace_period,
TP_PROTO(const char *rcuname, unsigned long gpseq, const char *gpevent),
@@ -218,7 +222,7 @@ TRACE_EVENT(rcu_exp_grace_period,
* "nxtlvl": Advance to next level of rcu_node funnel
* "wait": Wait for someone else to do expedited GP
*/
-TRACE_EVENT(rcu_exp_funnel_lock,
+TRACE_EVENT_RCU(rcu_exp_funnel_lock,
TP_PROTO(const char *rcuname, u8 level, int grplo, int grphi,
const char *gpevent),
@@ -269,7 +273,7 @@ TRACE_EVENT(rcu_exp_funnel_lock,
* "WaitQueue": Enqueue partially done, timed wait for it to complete.
* "WokeQueue": Partial enqueue now complete.
*/
-TRACE_EVENT(rcu_nocb_wake,
+TRACE_EVENT_RCU(rcu_nocb_wake,
TP_PROTO(const char *rcuname, int cpu, const char *reason),
@@ -297,7 +301,7 @@ TRACE_EVENT(rcu_nocb_wake,
* include SRCU), the grace-period number that the task is blocking
* (the current or the next), and the task's PID.
*/
-TRACE_EVENT(rcu_preempt_task,
+TRACE_EVENT_RCU(rcu_preempt_task,
TP_PROTO(const char *rcuname, int pid, unsigned long gp_seq),
@@ -324,7 +328,7 @@ TRACE_EVENT(rcu_preempt_task,
* read-side critical section exiting that critical section. Track the
* type of RCU (which one day might include SRCU) and the task's PID.
*/
-TRACE_EVENT(rcu_unlock_preempted_task,
+TRACE_EVENT_RCU(rcu_unlock_preempted_task,
TP_PROTO(const char *rcuname, unsigned long gp_seq, int pid),
@@ -353,7 +357,7 @@ TRACE_EVENT(rcu_unlock_preempted_task,
* whether there are any blocked tasks blocking the current grace period.
* All but the type of RCU are extracted from the rcu_node structure.
*/
-TRACE_EVENT(rcu_quiescent_state_report,
+TRACE_EVENT_RCU(rcu_quiescent_state_report,
TP_PROTO(const char *rcuname, unsigned long gp_seq,
unsigned long mask, unsigned long qsmask,
@@ -396,7 +400,7 @@ TRACE_EVENT(rcu_quiescent_state_report,
* state, which can be "dti" for dyntick-idle mode or "kick" when kicking
* a CPU that has been in dyntick-idle mode for too long.
*/
-TRACE_EVENT(rcu_fqs,
+TRACE_EVENT_RCU(rcu_fqs,
TP_PROTO(const char *rcuname, unsigned long gp_seq, int cpu, const char *qsevent),
@@ -436,7 +440,7 @@ TRACE_EVENT(rcu_fqs,
* events use two separate counters, and that the "++=" and "--=" events
* for irq/NMI will change the counter by two, otherwise by one.
*/
-TRACE_EVENT(rcu_dyntick,
+TRACE_EVENT_RCU(rcu_dyntick,
TP_PROTO(const char *polarity, long oldnesting, long newnesting, atomic_t dynticks),
@@ -468,7 +472,7 @@ TRACE_EVENT(rcu_dyntick,
* number of lazy callbacks queued, and the fourth element is the
* total number of callbacks queued.
*/
-TRACE_EVENT(rcu_callback,
+TRACE_EVENT_RCU(rcu_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, long qlen_lazy,
long qlen),
@@ -504,7 +508,7 @@ TRACE_EVENT(rcu_callback,
* the fourth argument is the number of lazy callbacks queued, and the
* fifth argument is the total number of callbacks queued.
*/
-TRACE_EVENT(rcu_kfree_callback,
+TRACE_EVENT_RCU(rcu_kfree_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset,
long qlen_lazy, long qlen),
@@ -539,7 +543,7 @@ TRACE_EVENT(rcu_kfree_callback,
* the total number of callbacks queued, and the fourth argument is
* the current RCU-callback batch limit.
*/
-TRACE_EVENT(rcu_batch_start,
+TRACE_EVENT_RCU(rcu_batch_start,
TP_PROTO(const char *rcuname, long qlen_lazy, long qlen, long blimit),
@@ -569,7 +573,7 @@ TRACE_EVENT(rcu_batch_start,
* The first argument is the type of RCU, and the second argument is
* a pointer to the RCU callback itself.
*/
-TRACE_EVENT(rcu_invoke_callback,
+TRACE_EVENT_RCU(rcu_invoke_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp),
@@ -598,7 +602,7 @@ TRACE_EVENT(rcu_invoke_callback,
* is the offset of the callback within the enclosing RCU-protected
* data structure.
*/
-TRACE_EVENT(rcu_invoke_kfree_callback,
+TRACE_EVENT_RCU(rcu_invoke_kfree_callback,
TP_PROTO(const char *rcuname, struct rcu_head *rhp, unsigned long offset),
@@ -631,7 +635,7 @@ TRACE_EVENT(rcu_invoke_kfree_callback,
* and the sixth argument (risk) is the return value from
* rcu_is_callbacks_kthread().
*/
-TRACE_EVENT(rcu_batch_end,
+TRACE_EVENT_RCU(rcu_batch_end,
TP_PROTO(const char *rcuname, int callbacks_invoked,
char cb, char nr, char iit, char risk),
@@ -673,7 +677,7 @@ TRACE_EVENT(rcu_batch_end,
* callback address can be NULL.
*/
#define RCUTORTURENAME_LEN 8
-TRACE_EVENT(rcu_torture_read,
+TRACE_EVENT_RCU(rcu_torture_read,
TP_PROTO(const char *rcutorturename, struct rcu_head *rhp,
unsigned long secs, unsigned long c_old, unsigned long c),
@@ -721,7 +725,7 @@ TRACE_EVENT(rcu_torture_read,
* The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
* is the count of remaining callbacks, and "done" is the piggybacking count.
*/
-TRACE_EVENT(rcu_barrier,
+TRACE_EVENT_RCU(rcu_barrier,
TP_PROTO(const char *rcuname, const char *s, int cpu, int cnt, unsigned long done),
@@ -748,41 +752,6 @@ TRACE_EVENT(rcu_barrier,
__entry->done)
);
-#else /* #ifdef CONFIG_RCU_TRACE */
-
-#define trace_rcu_grace_period(rcuname, gp_seq, gpevent) do { } while (0)
-#define trace_rcu_future_grace_period(rcuname, gp_seq, gp_seq_req, \
- level, grplo, grphi, event) \
- do { } while (0)
-#define trace_rcu_grace_period_init(rcuname, gp_seq, level, grplo, grphi, \
- qsmask) do { } while (0)
-#define trace_rcu_exp_grace_period(rcuname, gqseq, gpevent) \
- do { } while (0)
-#define trace_rcu_exp_funnel_lock(rcuname, level, grplo, grphi, gpevent) \
- do { } while (0)
-#define trace_rcu_nocb_wake(rcuname, cpu, reason) do { } while (0)
-#define trace_rcu_preempt_task(rcuname, pid, gp_seq) do { } while (0)
-#define trace_rcu_unlock_preempted_task(rcuname, gp_seq, pid) do { } while (0)
-#define trace_rcu_quiescent_state_report(rcuname, gp_seq, mask, qsmask, level, \
- grplo, grphi, gp_tasks) do { } \
- while (0)
-#define trace_rcu_fqs(rcuname, gp_seq, cpu, qsevent) do { } while (0)
-#define trace_rcu_dyntick(polarity, oldnesting, newnesting, dyntick) do { } while (0)
-#define trace_rcu_callback(rcuname, rhp, qlen_lazy, qlen) do { } while (0)
-#define trace_rcu_kfree_callback(rcuname, rhp, offset, qlen_lazy, qlen) \
- do { } while (0)
-#define trace_rcu_batch_start(rcuname, qlen_lazy, qlen, blimit) \
- do { } while (0)
-#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
-#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
-#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
- do { } while (0)
-#define trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
- do { } while (0)
-#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
-
-#endif /* #else #ifdef CONFIG_RCU_TRACE */
-
#endif /* _TRACE_RCU_H */
/* This part must be outside protection */
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index acee72c0b24b..442ace406ac9 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -11,11 +11,6 @@
#define __LINUX_RCU_H
#include <trace/events/rcu.h>
-#ifdef CONFIG_RCU_TRACE
-#define RCU_TRACE(stmt) stmt
-#else /* #ifdef CONFIG_RCU_TRACE */
-#define RCU_TRACE(stmt)
-#endif /* #else #ifdef CONFIG_RCU_TRACE */
/* Offset to allow distinguishing irq vs. task-based idle entry/exit. */
#define DYNTICK_IRQ_NONIDLE ((LONG_MAX / 2) + 1)
@@ -216,12 +211,12 @@ static inline bool __rcu_reclaim(const char *rn, struct rcu_head *head)
rcu_lock_acquire(&rcu_callback_map);
if (__is_kfree_rcu_offset(offset)) {
- RCU_TRACE(trace_rcu_invoke_kfree_callback(rn, head, offset);)
+ trace_rcu_invoke_kfree_callback(rn, head, offset);
kfree((void *)head - offset);
rcu_lock_release(&rcu_callback_map);
return true;
} else {
- RCU_TRACE(trace_rcu_invoke_callback(rn, head);)
+ trace_rcu_invoke_callback(rn, head);
f = head->func;
WRITE_ONCE(head->func, (rcu_callback_t)0L);
f(head);
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index acd6ccf56faf..906563a1cdea 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2352,14 +2352,14 @@ rcu_check_quiescent_state(struct rcu_data *rdp)
*/
int rcutree_dying_cpu(unsigned int cpu)
{
- RCU_TRACE(bool blkd;)
- RCU_TRACE(struct rcu_data *rdp = this_cpu_ptr(&rcu_data);)
- RCU_TRACE(struct rcu_node *rnp = rdp->mynode;)
+ bool blkd;
+ struct rcu_data *rdp = this_cpu_ptr(&rcu_data);
+ struct rcu_node *rnp = rdp->mynode;
if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
return 0;
- RCU_TRACE(blkd = !!(rnp->qsmask & rdp->grpmask);)
+ blkd = !!(rnp->qsmask & rdp->grpmask);
trace_rcu_grace_period(rcu_state.name, rnp->gp_seq,
blkd ? TPS("cpuofl") : TPS("cpuofl-bgp"));
return 0;
--
2.20.1
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