Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index eb908ef..7482a14 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -7,20 +7,77 @@
#include <linux/module.h>
#include <linux/kallsyms.h>
+#include <linux/security.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/stacktrace.h>
#include <linux/rculist.h>
#include <linux/tracefs.h>
+/* for gfp flag names */
+#include <linux/trace_events.h>
+#include <trace/events/mmflags.h>
+
#include "tracing_map.h"
#include "trace.h"
+#include "trace_dynevent.h"
#define SYNTH_SYSTEM "synthetic"
#define SYNTH_FIELDS_MAX 16
#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 in 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,
@@ -39,6 +96,16 @@
FIELD_OP_UNARY_MINUS,
};
+/*
+ * A hist_var (histogram variable) contains variable information for
+ * hist_fields having the HIST_FIELD_FL_VAR or HIST_FIELD_FL_VAR_REF
+ * flag set. A hist_var has a variable name e.g. ts0, and is
+ * associated with a given histogram trigger, as specified by
+ * hist_data. The hist_var idx is the unique index assigned to the
+ * variable by the hist trigger's tracing_map. The idx is what is
+ * used to set a variable's value and, by a variable reference, to
+ * retrieve it.
+ */
struct hist_var {
char *name;
struct hist_trigger_data *hist_data;
@@ -55,12 +122,29 @@
const char *type;
struct hist_field *operands[HIST_FIELD_OPERANDS_MAX];
struct hist_trigger_data *hist_data;
+
+ /*
+ * Variable fields contain variable-specific info in var.
+ */
struct hist_var var;
enum field_op_id operator;
char *system;
char *event_name;
+
+ /*
+ * The name field is used for EXPR and VAR_REF fields. VAR
+ * fields contain the variable name in var.name.
+ */
char *name;
- unsigned int var_idx;
+
+ /*
+ * When a histogram trigger is hit, if it has any references
+ * to variables, the values of those variables are collected
+ * into a var_ref_vals array by resolve_var_refs(). The
+ * current value of each variable is read from the tracing_map
+ * using the hist field's hist_var.idx and entered into the
+ * var_ref_idx entry i.e. var_ref_vals[var_ref_idx].
+ */
unsigned int var_ref_idx;
bool read_once;
};
@@ -279,17 +363,30 @@
struct action_data *actions[HIST_ACTIONS_MAX];
unsigned int n_actions;
- struct hist_field *synth_var_refs[SYNTH_FIELDS_MAX];
- unsigned int n_synth_var_refs;
struct field_var *field_vars[SYNTH_FIELDS_MAX];
unsigned int n_field_vars;
unsigned int n_field_var_str;
struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
unsigned int n_field_var_hists;
- struct field_var *max_vars[SYNTH_FIELDS_MAX];
- unsigned int n_max_vars;
- unsigned int n_max_var_str;
+ struct field_var *save_vars[SYNTH_FIELDS_MAX];
+ unsigned int n_save_vars;
+ unsigned int n_save_var_str;
+};
+
+static int synth_event_create(int argc, const char **argv);
+static int synth_event_show(struct seq_file *m, struct dyn_event *ev);
+static int synth_event_release(struct dyn_event *ev);
+static bool synth_event_is_busy(struct dyn_event *ev);
+static bool synth_event_match(const char *system, const char *event,
+ int argc, const char **argv, struct dyn_event *ev);
+
+static struct dyn_event_operations synth_event_ops = {
+ .create = synth_event_create,
+ .show = synth_event_show,
+ .is_busy = synth_event_is_busy,
+ .free = synth_event_release,
+ .match = synth_event_match,
};
struct synth_field {
@@ -301,7 +398,7 @@
};
struct synth_event {
- struct list_head list;
+ struct dyn_event devent;
int ref;
char *name;
struct synth_field **fields;
@@ -312,99 +409,233 @@
struct tracepoint *tp;
};
+static bool is_synth_event(struct dyn_event *ev)
+{
+ return ev->ops == &synth_event_ops;
+}
+
+static struct synth_event *to_synth_event(struct dyn_event *ev)
+{
+ return container_of(ev, struct synth_event, devent);
+}
+
+static bool synth_event_is_busy(struct dyn_event *ev)
+{
+ struct synth_event *event = to_synth_event(ev);
+
+ return event->ref != 0;
+}
+
+static bool synth_event_match(const char *system, const char *event,
+ int argc, const char **argv, struct dyn_event *ev)
+{
+ struct synth_event *sev = to_synth_event(ev);
+
+ return strcmp(sev->name, event) == 0 &&
+ (!system || strcmp(system, SYNTH_SYSTEM) == 0);
+}
+
struct action_data;
typedef void (*action_fn_t) (struct hist_trigger_data *hist_data,
struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe,
+ struct ring_buffer_event *rbe, void *key,
struct action_data *data, u64 *var_ref_vals);
+typedef bool (*check_track_val_fn_t) (u64 track_val, u64 var_val);
+
+enum handler_id {
+ HANDLER_ONMATCH = 1,
+ HANDLER_ONMAX,
+ HANDLER_ONCHANGE,
+};
+
+enum action_id {
+ ACTION_SAVE = 1,
+ ACTION_TRACE,
+ ACTION_SNAPSHOT,
+};
+
struct action_data {
+ enum handler_id handler;
+ enum action_id action;
+ char *action_name;
action_fn_t fn;
+
unsigned int n_params;
char *params[SYNTH_FIELDS_MAX];
+ /*
+ * When a histogram trigger is hit, the values of any
+ * references to variables, including variables being passed
+ * as parameters to synthetic events, are collected into a
+ * var_ref_vals array. This var_ref_idx is the index of the
+ * first param in the array to be passed to the synthetic
+ * event invocation.
+ */
+ unsigned int var_ref_idx;
+ struct synth_event *synth_event;
+ bool use_trace_keyword;
+ char *synth_event_name;
+
union {
struct {
- unsigned int var_ref_idx;
- char *match_event;
- char *match_event_system;
- char *synth_event_name;
- struct synth_event *synth_event;
- } onmatch;
+ char *event;
+ char *event_system;
+ } match_data;
struct {
+ /*
+ * var_str contains the $-unstripped variable
+ * name referenced by var_ref, and used when
+ * printing the action. Because var_ref
+ * creation is deferred to create_actions(),
+ * we need a per-action way to save it until
+ * then, thus var_str.
+ */
char *var_str;
- char *fn_name;
- unsigned int max_var_ref_idx;
- struct hist_field *max_var;
- struct hist_field *var;
- } onmax;
+
+ /*
+ * var_ref refers to the variable being
+ * tracked e.g onmax($var).
+ */
+ struct hist_field *var_ref;
+
+ /*
+ * track_var contains the 'invisible' tracking
+ * variable created to keep the current
+ * e.g. max value.
+ */
+ struct hist_field *track_var;
+
+ check_track_val_fn_t check_val;
+ action_fn_t save_data;
+ } track_data;
};
};
+struct track_data {
+ u64 track_val;
+ bool updated;
-static char last_hist_cmd[MAX_FILTER_STR_VAL];
-static char hist_err_str[MAX_FILTER_STR_VAL];
+ unsigned int key_len;
+ void *key;
+ struct tracing_map_elt elt;
-static void last_cmd_set(char *str)
+ struct action_data *action_data;
+ struct hist_trigger_data *hist_data;
+};
+
+struct hist_elt_data {
+ char *comm;
+ u64 *var_ref_vals;
+ char *field_var_str[SYNTH_FIELDS_MAX];
+};
+
+struct snapshot_context {
+ struct tracing_map_elt *elt;
+ void *key;
+};
+
+static void track_data_free(struct track_data *track_data)
{
- if (!str)
+ struct hist_elt_data *elt_data;
+
+ if (!track_data)
return;
- strncpy(last_hist_cmd, str, MAX_FILTER_STR_VAL - 1);
+ kfree(track_data->key);
+
+ elt_data = track_data->elt.private_data;
+ if (elt_data) {
+ kfree(elt_data->comm);
+ kfree(elt_data);
+ }
+
+ kfree(track_data);
}
-static void hist_err(char *str, char *var)
+static struct track_data *track_data_alloc(unsigned int key_len,
+ struct action_data *action_data,
+ struct hist_trigger_data *hist_data)
{
- int maxlen = MAX_FILTER_STR_VAL - 1;
+ struct track_data *data = kzalloc(sizeof(*data), GFP_KERNEL);
+ struct hist_elt_data *elt_data;
+
+ if (!data)
+ return ERR_PTR(-ENOMEM);
+
+ data->key = kzalloc(key_len, GFP_KERNEL);
+ if (!data->key) {
+ track_data_free(data);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ data->key_len = key_len;
+ data->action_data = action_data;
+ data->hist_data = hist_data;
+
+ elt_data = kzalloc(sizeof(*elt_data), GFP_KERNEL);
+ if (!elt_data) {
+ track_data_free(data);
+ return ERR_PTR(-ENOMEM);
+ }
+ data->elt.private_data = elt_data;
+
+ elt_data->comm = kzalloc(TASK_COMM_LEN, GFP_KERNEL);
+ if (!elt_data->comm) {
+ track_data_free(data);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return data;
+}
+
+static char last_cmd[MAX_FILTER_STR_VAL];
+static char last_cmd_loc[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)
+{
+ const char *system = NULL, *name = NULL;
+ struct trace_event_call *call;
if (!str)
return;
- if (strlen(hist_err_str))
- return;
+ strncpy(last_cmd, str, MAX_FILTER_STR_VAL - 1);
- if (!var)
- var = "";
+ if (file) {
+ call = file->event_call;
- if (strlen(hist_err_str) + strlen(str) + strlen(var) > maxlen)
- return;
+ system = call->class->system;
+ if (system) {
+ name = trace_event_name(call);
+ if (!name)
+ system = NULL;
+ }
+ }
- strcat(hist_err_str, str);
- strcat(hist_err_str, var);
+ if (system)
+ snprintf(last_cmd_loc, MAX_FILTER_STR_VAL, "hist:%s:%s", system, name);
}
-static void hist_err_event(char *str, char *system, char *event, char *var)
+static void hist_err(struct trace_array *tr, u8 err_type, u8 err_pos)
{
- 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(tr, 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;
-}
-
-static LIST_HEAD(synth_event_list);
-static DEFINE_MUTEX(synth_event_mutex);
-
struct synth_trace_event {
struct trace_entry ent;
u64 fields[];
@@ -446,7 +677,9 @@
static bool synth_field_signed(char *type)
{
- if (strncmp(type, "u", 1) == 0)
+ if (str_has_prefix(type, "u"))
+ return false;
+ if (strcmp(type, "gfp_t") == 0)
return false;
return true;
@@ -469,7 +702,7 @@
start = strstr(type, "char[");
if (start == NULL)
return -EINVAL;
- start += strlen("char[");
+ start += sizeof("char[") - 1;
end = strchr(type, ']');
if (!end || end < start)
@@ -526,6 +759,8 @@
size = sizeof(unsigned long);
else if (strcmp(type, "pid_t") == 0)
size = sizeof(pid_t);
+ else if (strcmp(type, "gfp_t") == 0)
+ size = sizeof(gfp_t);
else if (synth_field_is_string(type))
size = synth_field_string_size(type);
@@ -566,6 +801,8 @@
fmt = "%lu";
else if (strcmp(type, "pid_t") == 0)
fmt = "%d";
+ else if (strcmp(type, "gfp_t") == 0)
+ fmt = "%x";
else if (synth_field_is_string(type))
fmt = "%s";
@@ -608,9 +845,20 @@
i == se->n_fields - 1 ? "" : " ");
n_u64 += STR_VAR_LEN_MAX / sizeof(u64);
} else {
+ struct trace_print_flags __flags[] = {
+ __def_gfpflag_names, {-1, NULL} };
+
trace_seq_printf(s, print_fmt, se->fields[i]->name,
entry->fields[n_u64],
i == se->n_fields - 1 ? "" : " ");
+
+ if (strcmp(se->fields[i]->type, "gfp_t") == 0) {
+ trace_seq_puts(s, " (");
+ trace_print_flags_seq(s, "|",
+ entry->fields[n_u64],
+ __flags);
+ trace_seq_putc(s, ')');
+ }
n_u64++;
}
}
@@ -738,14 +986,12 @@
kfree(field);
}
-static struct synth_field *parse_synth_field(int argc, char **argv,
+static struct synth_field *parse_synth_field(int argc, const char **argv,
int *consumed)
{
struct synth_field *field;
- const char *prefix = NULL;
- char *field_type = argv[0], *field_name;
+ const char *prefix = NULL, *field_type = argv[0], *field_name, *array;
int len, ret = 0;
- char *array;
if (field_type[0] == ';')
field_type++;
@@ -762,20 +1008,31 @@
*consumed = 2;
}
- len = strlen(field_name);
- if (field_name[len - 1] == ';')
- field_name[len - 1] = '\0';
-
field = kzalloc(sizeof(*field), GFP_KERNEL);
if (!field)
return ERR_PTR(-ENOMEM);
- len = strlen(field_type) + 1;
+ len = strlen(field_name);
array = strchr(field_name, '[');
if (array)
+ len -= strlen(array);
+ else if (field_name[len - 1] == ';')
+ len--;
+
+ field->name = kmemdup_nul(field_name, len, GFP_KERNEL);
+ if (!field->name) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ if (field_type[0] == ';')
+ field_type++;
+ len = strlen(field_type) + 1;
+ if (array)
len += strlen(array);
if (prefix)
len += strlen(prefix);
+
field->type = kzalloc(len, GFP_KERNEL);
if (!field->type) {
ret = -ENOMEM;
@@ -786,7 +1043,8 @@
strcat(field->type, field_type);
if (array) {
strcat(field->type, array);
- *array = '\0';
+ if (field->type[len - 1] == ';')
+ field->type[len - 1] = '\0';
}
field->size = synth_field_size(field->type);
@@ -800,11 +1058,6 @@
field->is_signed = synth_field_signed(field->type);
- field->name = kstrdup(field_name, GFP_KERNEL);
- if (!field->name) {
- ret = -ENOMEM;
- goto free;
- }
out:
return field;
free:
@@ -868,9 +1121,13 @@
static struct synth_event *find_synth_event(const char *name)
{
+ struct dyn_event *pos;
struct synth_event *event;
- list_for_each_entry(event, &synth_event_list, list) {
+ for_each_dyn_event(pos) {
+ if (!is_synth_event(pos))
+ continue;
+ event = to_synth_event(pos);
if (strcmp(event->name, name) == 0)
return event;
}
@@ -959,7 +1216,7 @@
kfree(event);
}
-static struct synth_event *alloc_synth_event(char *event_name, int n_fields,
+static struct synth_event *alloc_synth_event(const char *name, int n_fields,
struct synth_field **fields)
{
struct synth_event *event;
@@ -971,7 +1228,7 @@
goto out;
}
- event->name = kstrdup(event_name, GFP_KERNEL);
+ event->name = kstrdup(name, GFP_KERNEL);
if (!event->name) {
kfree(event);
event = ERR_PTR(-ENOMEM);
@@ -985,6 +1242,8 @@
goto out;
}
+ dyn_event_init(&event->devent, &synth_event_ops);
+
for (i = 0; i < n_fields; i++)
event->fields[i] = fields[i];
@@ -995,12 +1254,12 @@
static void action_trace(struct hist_trigger_data *hist_data,
struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe,
+ struct ring_buffer_event *rbe, void *key,
struct action_data *data, u64 *var_ref_vals)
{
- struct synth_event *event = data->onmatch.synth_event;
+ struct synth_event *event = data->synth_event;
- trace_synth(event, var_ref_vals, data->onmatch.var_ref_idx);
+ trace_synth(event, var_ref_vals, data->var_ref_idx);
}
struct hist_var_data {
@@ -1008,29 +1267,11 @@
struct hist_trigger_data *hist_data;
};
-static void add_or_delete_synth_event(struct synth_event *event, int delete)
-{
- if (delete)
- free_synth_event(event);
- else {
- mutex_lock(&synth_event_mutex);
- if (!find_synth_event(event->name))
- list_add(&event->list, &synth_event_list);
- else
- free_synth_event(event);
- mutex_unlock(&synth_event_mutex);
- }
-}
-
-static int create_synth_event(int argc, char **argv)
+static int __create_synth_event(int argc, const char *name, const char **argv)
{
struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
struct synth_event *event = NULL;
- bool delete_event = false;
int i, consumed = 0, n_fields = 0, ret = 0;
- char *name;
-
- mutex_lock(&synth_event_mutex);
/*
* Argument syntax:
@@ -1038,42 +1279,19 @@
* - Remove synthetic event: !<event_name> field[;field] ...
* where 'field' = type field_name
*/
- if (argc < 1) {
- ret = -EINVAL;
- goto out;
- }
- name = argv[0];
- if (name[0] == '!') {
- delete_event = true;
- name++;
- }
+ if (name[0] == '\0' || argc < 1)
+ return -EINVAL;
+
+ mutex_lock(&event_mutex);
event = find_synth_event(name);
if (event) {
- if (delete_event) {
- if (event->ref) {
- event = NULL;
- ret = -EBUSY;
- goto out;
- }
- list_del(&event->list);
- goto out;
- }
- event = NULL;
ret = -EEXIST;
goto out;
- } else if (delete_event) {
- ret = -ENOENT;
- goto out;
}
- if (argc < 2) {
- ret = -EINVAL;
- goto out;
- }
-
- for (i = 1; i < argc - 1; i++) {
+ for (i = 0; i < argc - 1; i++) {
if (strcmp(argv[i], ";") == 0)
continue;
if (n_fields == SYNTH_FIELDS_MAX) {
@@ -1101,83 +1319,91 @@
event = NULL;
goto err;
}
+ ret = register_synth_event(event);
+ if (!ret)
+ dyn_event_add(&event->devent);
+ else
+ free_synth_event(event);
out:
- mutex_unlock(&synth_event_mutex);
-
- if (event) {
- if (delete_event) {
- ret = unregister_synth_event(event);
- add_or_delete_synth_event(event, !ret);
- } else {
- ret = register_synth_event(event);
- add_or_delete_synth_event(event, ret);
- }
- }
+ mutex_unlock(&event_mutex);
return ret;
err:
- mutex_unlock(&synth_event_mutex);
-
for (i = 0; i < n_fields; i++)
free_synth_field(fields[i]);
+
+ goto out;
+}
+
+static int create_or_delete_synth_event(int argc, char **argv)
+{
+ const char *name = argv[0];
+ struct synth_event *event = NULL;
+ int ret;
+
+ /* trace_run_command() ensures argc != 0 */
+ if (name[0] == '!') {
+ mutex_lock(&event_mutex);
+ event = find_synth_event(name + 1);
+ if (event) {
+ if (event->ref)
+ ret = -EBUSY;
+ else {
+ ret = unregister_synth_event(event);
+ if (!ret) {
+ dyn_event_remove(&event->devent);
+ free_synth_event(event);
+ }
+ }
+ } else
+ ret = -ENOENT;
+ mutex_unlock(&event_mutex);
+ return ret;
+ }
+
+ ret = __create_synth_event(argc - 1, name, (const char **)argv + 1);
+ return ret == -ECANCELED ? -EINVAL : ret;
+}
+
+static int synth_event_create(int argc, const char **argv)
+{
+ const char *name = argv[0];
+ int len;
+
+ if (name[0] != 's' || name[1] != ':')
+ return -ECANCELED;
+ name += 2;
+
+ /* This interface accepts group name prefix */
+ if (strchr(name, '/')) {
+ len = str_has_prefix(name, SYNTH_SYSTEM "/");
+ if (len == 0)
+ return -EINVAL;
+ name += len;
+ }
+ return __create_synth_event(argc - 1, name, argv + 1);
+}
+
+static int synth_event_release(struct dyn_event *ev)
+{
+ struct synth_event *event = to_synth_event(ev);
+ int ret;
+
+ if (event->ref)
+ return -EBUSY;
+
+ ret = unregister_synth_event(event);
+ if (ret)
+ return ret;
+
+ dyn_event_remove(ev);
free_synth_event(event);
-
- return ret;
+ return 0;
}
-static int release_all_synth_events(void)
-{
- struct list_head release_events;
- struct synth_event *event, *e;
- int ret = 0;
-
- INIT_LIST_HEAD(&release_events);
-
- mutex_lock(&synth_event_mutex);
-
- list_for_each_entry(event, &synth_event_list, list) {
- if (event->ref) {
- mutex_unlock(&synth_event_mutex);
- return -EBUSY;
- }
- }
-
- list_splice_init(&event->list, &release_events);
-
- mutex_unlock(&synth_event_mutex);
-
- list_for_each_entry_safe(event, e, &release_events, list) {
- list_del(&event->list);
-
- ret = unregister_synth_event(event);
- add_or_delete_synth_event(event, !ret);
- }
-
- return ret;
-}
-
-
-static void *synth_events_seq_start(struct seq_file *m, loff_t *pos)
-{
- mutex_lock(&synth_event_mutex);
-
- return seq_list_start(&synth_event_list, *pos);
-}
-
-static void *synth_events_seq_next(struct seq_file *m, void *v, loff_t *pos)
-{
- return seq_list_next(v, &synth_event_list, pos);
-}
-
-static void synth_events_seq_stop(struct seq_file *m, void *v)
-{
- mutex_unlock(&synth_event_mutex);
-}
-
-static int synth_events_seq_show(struct seq_file *m, void *v)
+static int __synth_event_show(struct seq_file *m, struct synth_event *event)
{
struct synth_field *field;
- struct synth_event *event = v;
unsigned int i;
seq_printf(m, "%s\t", event->name);
@@ -1195,19 +1421,42 @@
return 0;
}
+static int synth_event_show(struct seq_file *m, struct dyn_event *ev)
+{
+ struct synth_event *event = to_synth_event(ev);
+
+ seq_printf(m, "s:%s/", event->class.system);
+
+ return __synth_event_show(m, event);
+}
+
+static int synth_events_seq_show(struct seq_file *m, void *v)
+{
+ struct dyn_event *ev = v;
+
+ if (!is_synth_event(ev))
+ return 0;
+
+ return __synth_event_show(m, to_synth_event(ev));
+}
+
static const struct seq_operations synth_events_seq_op = {
- .start = synth_events_seq_start,
- .next = synth_events_seq_next,
- .stop = synth_events_seq_stop,
- .show = synth_events_seq_show
+ .start = dyn_event_seq_start,
+ .next = dyn_event_seq_next,
+ .stop = dyn_event_seq_stop,
+ .show = synth_events_seq_show,
};
static int synth_events_open(struct inode *inode, struct file *file)
{
int ret;
+ ret = security_locked_down(LOCKDOWN_TRACEFS);
+ if (ret)
+ return ret;
+
if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) {
- ret = release_all_synth_events();
+ ret = dyn_events_release_all(&synth_event_ops);
if (ret < 0)
return ret;
}
@@ -1220,7 +1469,7 @@
size_t count, loff_t *ppos)
{
return trace_parse_run_command(file, buffer, count, ppos,
- create_synth_event);
+ create_or_delete_synth_event);
}
static const struct file_operations synth_events_fops = {
@@ -1257,82 +1506,73 @@
return cpu;
}
+/**
+ * check_field_for_var_ref - Check if a VAR_REF field references a variable
+ * @hist_field: The VAR_REF field to check
+ * @var_data: The hist trigger that owns the variable
+ * @var_idx: The trigger variable identifier
+ *
+ * Check the given VAR_REF field to see whether or not it references
+ * the given variable associated with the given trigger.
+ *
+ * Return: The VAR_REF field if it does reference the variable, NULL if not
+ */
static struct hist_field *
check_field_for_var_ref(struct hist_field *hist_field,
struct hist_trigger_data *var_data,
unsigned int var_idx)
{
- struct hist_field *found = NULL;
+ WARN_ON(!(hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF));
- if (hist_field && hist_field->flags & HIST_FIELD_FL_VAR_REF) {
- if (hist_field->var.idx == var_idx &&
- hist_field->var.hist_data == var_data) {
- found = hist_field;
- }
- }
+ if (hist_field && hist_field->var.idx == var_idx &&
+ hist_field->var.hist_data == var_data)
+ return hist_field;
- return found;
+ return NULL;
}
-static struct hist_field *
-check_field_for_var_refs(struct hist_trigger_data *hist_data,
- struct hist_field *hist_field,
- struct hist_trigger_data *var_data,
- unsigned int var_idx,
- unsigned int level)
-{
- struct hist_field *found = NULL;
- unsigned int i;
-
- if (level > 3)
- return found;
-
- if (!hist_field)
- return found;
-
- found = check_field_for_var_ref(hist_field, var_data, var_idx);
- if (found)
- return found;
-
- for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++) {
- struct hist_field *operand;
-
- operand = hist_field->operands[i];
- found = check_field_for_var_refs(hist_data, operand, var_data,
- var_idx, level + 1);
- if (found)
- return found;
- }
-
- return found;
-}
-
+/**
+ * find_var_ref - Check if a trigger has a reference to a trigger variable
+ * @hist_data: The hist trigger that might have a reference to the variable
+ * @var_data: The hist trigger that owns the variable
+ * @var_idx: The trigger variable identifier
+ *
+ * Check the list of var_refs[] on the first hist trigger to see
+ * whether any of them are references to the variable on the second
+ * trigger.
+ *
+ * Return: The VAR_REF field referencing the variable if so, NULL if not
+ */
static struct hist_field *find_var_ref(struct hist_trigger_data *hist_data,
struct hist_trigger_data *var_data,
unsigned int var_idx)
{
- struct hist_field *hist_field, *found = NULL;
+ struct hist_field *hist_field;
unsigned int i;
- for_each_hist_field(i, hist_data) {
- hist_field = hist_data->fields[i];
- found = check_field_for_var_refs(hist_data, hist_field,
- var_data, var_idx, 0);
- if (found)
- return found;
+ for (i = 0; i < hist_data->n_var_refs; i++) {
+ hist_field = hist_data->var_refs[i];
+ if (check_field_for_var_ref(hist_field, var_data, var_idx))
+ return hist_field;
}
- for (i = 0; i < hist_data->n_synth_var_refs; i++) {
- hist_field = hist_data->synth_var_refs[i];
- found = check_field_for_var_refs(hist_data, hist_field,
- var_data, var_idx, 0);
- if (found)
- return found;
- }
-
- return found;
+ return NULL;
}
+/**
+ * find_any_var_ref - Check if there is a reference to a given trigger variable
+ * @hist_data: The hist trigger
+ * @var_idx: The trigger variable identifier
+ *
+ * Check to see whether the given variable is currently referenced by
+ * any other trigger.
+ *
+ * The trigger the variable is defined on is explicitly excluded - the
+ * assumption being that a self-reference doesn't prevent a trigger
+ * from being removed.
+ *
+ * Return: The VAR_REF field referencing the variable if so, NULL if not
+ */
static struct hist_field *find_any_var_ref(struct hist_trigger_data *hist_data,
unsigned int var_idx)
{
@@ -1351,6 +1591,19 @@
return found;
}
+/**
+ * check_var_refs - Check if there is a reference to any of trigger's variables
+ * @hist_data: The hist trigger
+ *
+ * A trigger can define one or more variables. If any one of them is
+ * currently referenced by any other trigger, this function will
+ * determine that.
+
+ * Typically used to determine whether or not a trigger can be removed
+ * - if there are any references to a trigger's variables, it cannot.
+ *
+ * Return: True if there is a reference to any of trigger's variables
+ */
static bool check_var_refs(struct hist_trigger_data *hist_data)
{
struct hist_field *field;
@@ -1434,7 +1687,7 @@
if (var_data)
return 0;
- if (trace_array_get(tr) < 0)
+ if (tracing_check_open_get_tr(tr))
return -ENODEV;
var_data = kzalloc(sizeof(*var_data), GFP_KERNEL);
@@ -1530,7 +1783,7 @@
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(tr, HIST_ERR_VAR_NOT_UNIQUE, errpos(var_name));
return NULL;
}
@@ -1571,9 +1824,9 @@
for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i];
- if (data->fn == action_trace) {
- char *system = data->onmatch.match_event_system;
- char *event_name = data->onmatch.match_event;
+ if (data->handler == HANDLER_ONMATCH) {
+ char *system = data->match_data.event_system;
+ char *event_name = data->match_data.event;
file = find_var_file(tr, system, event_name, var_name);
if (!file)
@@ -1581,7 +1834,8 @@
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(tr, HIST_ERR_VAR_NOT_UNIQUE,
+ errpos(var_name));
return ERR_PTR(-EINVAL);
}
@@ -1618,12 +1872,6 @@
return hist_field;
}
-struct hist_elt_data {
- char *comm;
- u64 *var_ref_vals;
- char *field_var_str[SYNTH_FIELDS_MAX];
-};
-
static u64 hist_field_var_ref(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct ring_buffer_event *rbe,
@@ -1632,6 +1880,9 @@
struct hist_elt_data *elt_data;
u64 var_val = 0;
+ if (WARN_ON_ONCE(!elt))
+ return var_val;
+
elt_data = elt->private_data;
var_val = elt_data->var_ref_vals[hist_field->var_ref_idx];
@@ -1808,8 +2059,9 @@
if (attrs->n_actions >= HIST_ACTIONS_MAX)
return ret;
- if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) ||
- (strncmp(str, "onmax(", strlen("onmax(")) == 0)) {
+ if ((str_has_prefix(str, "onmatch(")) ||
+ (str_has_prefix(str, "onmax(")) ||
+ (str_has_prefix(str, "onchange("))) {
attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
if (!attrs->action_str[attrs->n_actions]) {
ret = -ENOMEM;
@@ -1818,42 +2070,42 @@
attrs->n_actions++;
ret = 0;
}
-
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;
- if ((strncmp(str, "key=", strlen("key=")) == 0) ||
- (strncmp(str, "keys=", strlen("keys=")) == 0)) {
+ if ((str_has_prefix(str, "key=")) ||
+ (str_has_prefix(str, "keys="))) {
attrs->keys_str = kstrdup(str, GFP_KERNEL);
if (!attrs->keys_str) {
ret = -ENOMEM;
goto out;
}
- } else if ((strncmp(str, "val=", strlen("val=")) == 0) ||
- (strncmp(str, "vals=", strlen("vals=")) == 0) ||
- (strncmp(str, "values=", strlen("values=")) == 0)) {
+ } else if ((str_has_prefix(str, "val=")) ||
+ (str_has_prefix(str, "vals=")) ||
+ (str_has_prefix(str, "values="))) {
attrs->vals_str = kstrdup(str, GFP_KERNEL);
if (!attrs->vals_str) {
ret = -ENOMEM;
goto out;
}
- } else if (strncmp(str, "sort=", strlen("sort=")) == 0) {
+ } else if (str_has_prefix(str, "sort=")) {
attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
if (!attrs->sort_key_str) {
ret = -ENOMEM;
goto out;
}
- } else if (strncmp(str, "name=", strlen("name=")) == 0) {
+ } else if (str_has_prefix(str, "name=")) {
attrs->name = kstrdup(str, GFP_KERNEL);
if (!attrs->name) {
ret = -ENOMEM;
goto out;
}
- } else if (strncmp(str, "clock=", strlen("clock=")) == 0) {
+ } else if (str_has_prefix(str, "clock=")) {
strsep(&str, "=");
if (!str) {
ret = -EINVAL;
@@ -1866,7 +2118,7 @@
ret = -ENOMEM;
goto out;
}
- } else if (strncmp(str, "size=", strlen("size=")) == 0) {
+ } else if (str_has_prefix(str, "size=")) {
int map_bits = parse_map_size(str);
if (map_bits < 0) {
@@ -1878,7 +2130,7 @@
char *assignment;
if (attrs->n_assignments == TRACING_MAP_VARS_MAX) {
- hist_err("Too many variables defined: ", str);
+ hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(str));
ret = -EINVAL;
goto out;
}
@@ -1895,7 +2147,8 @@
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;
@@ -1908,7 +2161,7 @@
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)
@@ -1957,7 +2210,7 @@
return;
}
- memcpy(comm, task->comm, TASK_COMM_LEN);
+ strncpy(comm, task->comm, TASK_COMM_LEN);
}
static void hist_elt_data_free(struct hist_elt_data *elt_data)
@@ -2003,7 +2256,7 @@
}
}
- n_str = hist_data->n_field_var_str + hist_data->n_max_var_str;
+ n_str = hist_data->n_field_var_str + hist_data->n_save_var_str;
size = STR_VAR_LEN_MAX;
@@ -2151,6 +2404,15 @@
return field_op;
}
+static void __destroy_hist_field(struct hist_field *hist_field)
+{
+ kfree(hist_field->var.name);
+ kfree(hist_field->name);
+ kfree(hist_field->type);
+
+ kfree(hist_field);
+}
+
static void destroy_hist_field(struct hist_field *hist_field,
unsigned int level)
{
@@ -2162,14 +2424,13 @@
if (!hist_field)
return;
+ if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
+ return; /* var refs will be destroyed separately */
+
for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
destroy_hist_field(hist_field->operands[i], level + 1);
- kfree(hist_field->var.name);
- kfree(hist_field->name);
- kfree(hist_field->type);
-
- kfree(hist_field);
+ __destroy_hist_field(hist_field);
}
static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
@@ -2296,6 +2557,12 @@
hist_data->fields[i] = NULL;
}
}
+
+ for (i = 0; i < hist_data->n_var_refs; i++) {
+ WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
+ __destroy_hist_field(hist_data->var_refs[i]);
+ hist_data->var_refs[i] = NULL;
+ }
}
static int init_var_ref(struct hist_field *ref_field,
@@ -2354,7 +2621,23 @@
goto out;
}
-static struct hist_field *create_var_ref(struct hist_field *var_field,
+/**
+ * create_var_ref - Create a variable reference and attach it to trigger
+ * @hist_data: The trigger that will be referencing the variable
+ * @var_field: The VAR field to create a reference to
+ * @system: The optional system string
+ * @event_name: The optional event_name string
+ *
+ * Given a variable hist_field, create a VAR_REF hist_field that
+ * represents a reference to it.
+ *
+ * This function also adds the reference to the trigger that
+ * now references the variable.
+ *
+ * Return: The VAR_REF field if successful, NULL if not
+ */
+static struct hist_field *create_var_ref(struct hist_trigger_data *hist_data,
+ struct hist_field *var_field,
char *system, char *event_name)
{
unsigned long flags = HIST_FIELD_FL_VAR_REF;
@@ -2366,6 +2649,9 @@
destroy_hist_field(ref_field, 0);
return NULL;
}
+
+ hist_data->var_refs[hist_data->n_var_refs] = ref_field;
+ ref_field->var_ref_idx = hist_data->n_var_refs++;
}
return ref_field;
@@ -2431,6 +2717,7 @@
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;
@@ -2439,11 +2726,11 @@
var_field = find_event_var(hist_data, system, event_name, var_name);
if (var_field)
- ref_field = create_var_ref(var_field, system, event_name);
+ ref_field = create_var_ref(hist_data, var_field,
+ system, event_name);
if (!ref_field)
- hist_err_event("Couldn't find variable: $",
- system, event_name, var_name);
+ hist_err(tr, HIST_ERR_VAR_NOT_FOUND, errpos(var_name));
return ref_field;
}
@@ -2454,6 +2741,7 @@
{
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)
@@ -2477,7 +2765,7 @@
else if (strcmp(modifier, "usecs") == 0)
*flags |= HIST_FIELD_FL_TIMESTAMP_USECS;
else {
- hist_err("Invalid field modifier: ", modifier);
+ hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
field = ERR_PTR(-EINVAL);
goto out;
}
@@ -2493,7 +2781,7 @@
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(tr, HIST_ERR_FIELD_NOT_FOUND, errpos(field_name));
field = ERR_PTR(-EINVAL);
goto out;
}
@@ -2523,6 +2811,8 @@
return NULL;
}
+ alias->var_ref_idx = var_ref->var_ref_idx;
+
return alias;
}
@@ -2555,10 +2845,9 @@
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) {
- hist_data->var_refs[hist_data->n_var_refs] = hist_field;
- hist_field->var_ref_idx = hist_data->n_var_refs++;
if (var_name) {
hist_field = create_alias(hist_data, hist_field, var_name);
if (!hist_field) {
@@ -2606,7 +2895,7 @@
/* we support only -(xxx) i.e. explicit parens required */
if (level > 3) {
- hist_err("Too many subexpressions (3 max): ", str);
+ hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
ret = -EINVAL;
goto free;
}
@@ -2661,7 +2950,8 @@
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;
@@ -2689,7 +2979,7 @@
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(tr, HIST_ERR_TIMESTAMP_MISMATCH, 0);
return -EINVAL;
}
@@ -2707,7 +2997,7 @@
char *sep, *operand1_str;
if (level > 3) {
- hist_err("Too many subexpressions (3 max): ", str);
+ hist_err(file->tr, HIST_ERR_TOO_MANY_SUBEXPR, errpos(str));
return ERR_PTR(-EINVAL);
}
@@ -2752,7 +3042,7 @@
goto free;
}
- ret = check_expr_operands(operand1, operand2);
+ ret = check_expr_operands(file->tr, operand1, operand2);
if (ret)
goto free;
@@ -2945,16 +3235,14 @@
int ret;
if (target_hist_data->n_field_var_hists >= SYNTH_FIELDS_MAX) {
- hist_err_event("onmatch: Too many field variables defined: ",
- subsys_name, event_name, 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_event("onmatch: Event file not found: ",
- subsys_name, event_name, field_name);
+ hist_err(tr, HIST_ERR_EVENT_FILE_NOT_FOUND, errpos(field_name));
ret = PTR_ERR(file);
return ERR_PTR(ret);
}
@@ -2967,8 +3255,7 @@
*/
hist_data = find_compatible_hist(target_hist_data, file);
if (!hist_data) {
- hist_err_event("onmatch: Matching event histogram not found: ",
- subsys_name, event_name, field_name);
+ hist_err(tr, HIST_ERR_HIST_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@@ -3029,8 +3316,7 @@
kfree(cmd);
kfree(var_hist->cmd);
kfree(var_hist);
- hist_err_event("onmatch: Couldn't create histogram for field: ",
- subsys_name, event_name, field_name);
+ hist_err(tr, HIST_ERR_HIST_CREATE_FAIL, errpos(field_name));
return ERR_PTR(ret);
}
@@ -3042,8 +3328,7 @@
if (IS_ERR_OR_NULL(event_var)) {
kfree(var_hist->cmd);
kfree(var_hist);
- hist_err_event("onmatch: Couldn't find synthetic variable: ",
- subsys_name, event_name, field_name);
+ hist_err(tr, HIST_ERR_SYNTH_VAR_NOT_FOUND, errpos(field_name));
return ERR_PTR(-EINVAL);
}
@@ -3120,13 +3405,13 @@
hist_data->n_field_vars, 0);
}
-static void update_max_vars(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt,
- struct ring_buffer_event *rbe,
- void *rec)
+static void save_track_data_vars(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt, void *rec,
+ struct ring_buffer_event *rbe, void *key,
+ struct action_data *data, u64 *var_ref_vals)
{
- __update_field_vars(elt, rbe, rec, hist_data->max_vars,
- hist_data->n_max_vars, hist_data->n_field_var_str);
+ __update_field_vars(elt, rbe, rec, hist_data->save_vars,
+ hist_data->n_save_vars, hist_data->n_field_var_str);
}
static struct hist_field *create_var(struct hist_trigger_data *hist_data,
@@ -3176,25 +3461,26 @@
{
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("Too many field variables defined: ", 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("Couldn't parse field variable: ", 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("Couldn't create or find variable: ", field_name);
+ hist_err(tr, HIST_ERR_VAR_CREATE_FIND_FAIL, errpos(field_name));
kfree(val);
ret = PTR_ERR(var);
goto err;
@@ -3261,18 +3547,196 @@
return create_field_var(target_hist_data, file, var_name);
}
-static void onmax_print(struct seq_file *m,
- struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt,
- struct action_data *data)
+static bool check_track_val_max(u64 track_val, u64 var_val)
{
- unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx;
+ if (var_val <= track_val)
+ return false;
- seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx));
+ return true;
+}
- for (i = 0; i < hist_data->n_max_vars; i++) {
- struct hist_field *save_val = hist_data->max_vars[i]->val;
- struct hist_field *save_var = hist_data->max_vars[i]->var;
+static bool check_track_val_changed(u64 track_val, u64 var_val)
+{
+ if (var_val == track_val)
+ return false;
+
+ return true;
+}
+
+static u64 get_track_val(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt,
+ struct action_data *data)
+{
+ unsigned int track_var_idx = data->track_data.track_var->var.idx;
+ u64 track_val;
+
+ track_val = tracing_map_read_var(elt, track_var_idx);
+
+ return track_val;
+}
+
+static void save_track_val(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt,
+ struct action_data *data, u64 var_val)
+{
+ unsigned int track_var_idx = data->track_data.track_var->var.idx;
+
+ tracing_map_set_var(elt, track_var_idx, var_val);
+}
+
+static void save_track_data(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt, void *rec,
+ struct ring_buffer_event *rbe, void *key,
+ struct action_data *data, u64 *var_ref_vals)
+{
+ if (data->track_data.save_data)
+ data->track_data.save_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
+}
+
+static bool check_track_val(struct tracing_map_elt *elt,
+ struct action_data *data,
+ u64 var_val)
+{
+ struct hist_trigger_data *hist_data;
+ u64 track_val;
+
+ hist_data = data->track_data.track_var->hist_data;
+ track_val = get_track_val(hist_data, elt, data);
+
+ return data->track_data.check_val(track_val, var_val);
+}
+
+#ifdef CONFIG_TRACER_SNAPSHOT
+static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
+{
+ /* called with tr->max_lock held */
+ struct track_data *track_data = tr->cond_snapshot->cond_data;
+ struct hist_elt_data *elt_data, *track_elt_data;
+ struct snapshot_context *context = cond_data;
+ struct action_data *action;
+ u64 track_val;
+
+ if (!track_data)
+ return false;
+
+ action = track_data->action_data;
+
+ track_val = get_track_val(track_data->hist_data, context->elt,
+ track_data->action_data);
+
+ if (!action->track_data.check_val(track_data->track_val, track_val))
+ return false;
+
+ track_data->track_val = track_val;
+ memcpy(track_data->key, context->key, track_data->key_len);
+
+ elt_data = context->elt->private_data;
+ track_elt_data = track_data->elt.private_data;
+ if (elt_data->comm)
+ strncpy(track_elt_data->comm, elt_data->comm, TASK_COMM_LEN);
+
+ track_data->updated = true;
+
+ return true;
+}
+
+static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt, void *rec,
+ struct ring_buffer_event *rbe, void *key,
+ struct action_data *data,
+ u64 *var_ref_vals)
+{
+ struct trace_event_file *file = hist_data->event_file;
+ struct snapshot_context context;
+
+ context.elt = elt;
+ context.key = key;
+
+ tracing_snapshot_cond(file->tr, &context);
+}
+
+static void hist_trigger_print_key(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ void *key,
+ struct tracing_map_elt *elt);
+
+static struct action_data *snapshot_action(struct hist_trigger_data *hist_data)
+{
+ unsigned int i;
+
+ if (!hist_data->n_actions)
+ return NULL;
+
+ for (i = 0; i < hist_data->n_actions; i++) {
+ struct action_data *data = hist_data->actions[i];
+
+ if (data->action == ACTION_SNAPSHOT)
+ return data;
+ }
+
+ return NULL;
+}
+
+static void track_data_snapshot_print(struct seq_file *m,
+ struct hist_trigger_data *hist_data)
+{
+ struct trace_event_file *file = hist_data->event_file;
+ struct track_data *track_data;
+ struct action_data *action;
+
+ track_data = tracing_cond_snapshot_data(file->tr);
+ if (!track_data)
+ return;
+
+ if (!track_data->updated)
+ return;
+
+ action = snapshot_action(hist_data);
+ if (!action)
+ return;
+
+ seq_puts(m, "\nSnapshot taken (see tracing/snapshot). Details:\n");
+ seq_printf(m, "\ttriggering value { %s(%s) }: %10llu",
+ action->handler == HANDLER_ONMAX ? "onmax" : "onchange",
+ action->track_data.var_str, track_data->track_val);
+
+ seq_puts(m, "\ttriggered by event with key: ");
+ hist_trigger_print_key(m, hist_data, track_data->key, &track_data->elt);
+ seq_putc(m, '\n');
+}
+#else
+static bool cond_snapshot_update(struct trace_array *tr, void *cond_data)
+{
+ return false;
+}
+static void save_track_data_snapshot(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt, void *rec,
+ struct ring_buffer_event *rbe, void *key,
+ struct action_data *data,
+ u64 *var_ref_vals) {}
+static void track_data_snapshot_print(struct seq_file *m,
+ struct hist_trigger_data *hist_data) {}
+#endif /* CONFIG_TRACER_SNAPSHOT */
+
+static void track_data_print(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt,
+ struct action_data *data)
+{
+ u64 track_val = get_track_val(hist_data, elt, data);
+ unsigned int i, save_var_idx;
+
+ if (data->handler == HANDLER_ONMAX)
+ seq_printf(m, "\n\tmax: %10llu", track_val);
+ else if (data->handler == HANDLER_ONCHANGE)
+ seq_printf(m, "\n\tchanged: %10llu", track_val);
+
+ if (data->action == ACTION_SNAPSHOT)
+ return;
+
+ for (i = 0; i < hist_data->n_save_vars; i++) {
+ struct hist_field *save_val = hist_data->save_vars[i]->val;
+ struct hist_field *save_var = hist_data->save_vars[i]->var;
u64 val;
save_var_idx = save_var->var.idx;
@@ -3287,135 +3751,136 @@
}
}
-static void onmax_save(struct hist_trigger_data *hist_data,
- struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe,
- struct action_data *data, u64 *var_ref_vals)
+static void ontrack_action(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt, void *rec,
+ struct ring_buffer_event *rbe, void *key,
+ struct action_data *data, u64 *var_ref_vals)
{
- unsigned int max_idx = data->onmax.max_var->var.idx;
- unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx;
+ u64 var_val = var_ref_vals[data->track_data.var_ref->var_ref_idx];
- u64 var_val, max_val;
-
- var_val = var_ref_vals[max_var_ref_idx];
- max_val = tracing_map_read_var(elt, max_idx);
-
- if (var_val <= max_val)
- return;
-
- tracing_map_set_var(elt, max_idx, var_val);
-
- update_max_vars(hist_data, elt, rbe, rec);
+ if (check_track_val(elt, data, var_val)) {
+ save_track_val(hist_data, elt, data, var_val);
+ save_track_data(hist_data, elt, rec, rbe, key, data, var_ref_vals);
+ }
}
-static void onmax_destroy(struct action_data *data)
+static void action_data_destroy(struct action_data *data)
{
unsigned int i;
- destroy_hist_field(data->onmax.max_var, 0);
- destroy_hist_field(data->onmax.var, 0);
+ lockdep_assert_held(&event_mutex);
- kfree(data->onmax.var_str);
- kfree(data->onmax.fn_name);
+ kfree(data->action_name);
for (i = 0; i < data->n_params; i++)
kfree(data->params[i]);
+ if (data->synth_event)
+ data->synth_event->ref--;
+
+ kfree(data->synth_event_name);
+
kfree(data);
}
-static int onmax_create(struct hist_trigger_data *hist_data,
- struct action_data *data)
+static void track_data_destroy(struct hist_trigger_data *hist_data,
+ struct action_data *data)
{
struct trace_event_file *file = hist_data->event_file;
- struct hist_field *var_field, *ref_field, *max_var;
- unsigned int var_ref_idx = hist_data->n_var_refs;
- struct field_var *field_var;
- char *onmax_var_str, *param;
- unsigned long flags;
- unsigned int i;
+
+ destroy_hist_field(data->track_data.track_var, 0);
+
+ if (data->action == ACTION_SNAPSHOT) {
+ struct track_data *track_data;
+
+ track_data = tracing_cond_snapshot_data(file->tr);
+ if (track_data && track_data->hist_data == hist_data) {
+ tracing_snapshot_cond_disable(file->tr);
+ track_data_free(track_data);
+ }
+ }
+
+ kfree(data->track_data.var_str);
+
+ action_data_destroy(data);
+}
+
+static int action_create(struct hist_trigger_data *hist_data,
+ struct action_data *data);
+
+static int track_data_create(struct hist_trigger_data *hist_data,
+ struct action_data *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;
- onmax_var_str = data->onmax.var_str;
- if (onmax_var_str[0] != '$') {
- hist_err("onmax: For onmax(x), x must be a variable: ", onmax_var_str);
+ track_data_var_str = data->track_data.var_str;
+ if (track_data_var_str[0] != '$') {
+ hist_err(tr, HIST_ERR_ONX_NOT_VAR, errpos(track_data_var_str));
return -EINVAL;
}
- onmax_var_str++;
+ track_data_var_str++;
- var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str);
+ var_field = find_target_event_var(hist_data, NULL, NULL, track_data_var_str);
if (!var_field) {
- hist_err("onmax: Couldn't find onmax variable: ", onmax_var_str);
+ hist_err(tr, HIST_ERR_ONX_VAR_NOT_FOUND, errpos(track_data_var_str));
return -EINVAL;
}
- flags = HIST_FIELD_FL_VAR_REF;
- ref_field = create_hist_field(hist_data, NULL, flags, NULL);
+ ref_field = create_var_ref(hist_data, var_field, NULL, NULL);
if (!ref_field)
return -ENOMEM;
- if (init_var_ref(ref_field, var_field, NULL, NULL)) {
- destroy_hist_field(ref_field, 0);
- ret = -ENOMEM;
+ data->track_data.var_ref = ref_field;
+
+ if (data->handler == HANDLER_ONMAX)
+ track_var = create_var(hist_data, file, "__max", sizeof(u64), "u64");
+ if (IS_ERR(track_var)) {
+ hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
+ ret = PTR_ERR(track_var);
goto out;
}
- hist_data->var_refs[hist_data->n_var_refs] = ref_field;
- ref_field->var_ref_idx = hist_data->n_var_refs++;
- data->onmax.var = ref_field;
- data->fn = onmax_save;
- data->onmax.max_var_ref_idx = var_ref_idx;
- max_var = create_var(hist_data, file, "max", sizeof(u64), "u64");
- if (IS_ERR(max_var)) {
- hist_err("onmax: Couldn't create onmax variable: ", "max");
- ret = PTR_ERR(max_var);
+ if (data->handler == HANDLER_ONCHANGE)
+ track_var = create_var(hist_data, file, "__change", sizeof(u64), "u64");
+ if (IS_ERR(track_var)) {
+ hist_err(tr, HIST_ERR_ONX_VAR_CREATE_FAIL, 0);
+ ret = PTR_ERR(track_var);
goto out;
}
- data->onmax.max_var = max_var;
+ data->track_data.track_var = track_var;
- for (i = 0; i < data->n_params; i++) {
- param = kstrdup(data->params[i], GFP_KERNEL);
- if (!param) {
- ret = -ENOMEM;
- goto out;
- }
-
- field_var = create_target_field_var(hist_data, NULL, NULL, param);
- if (IS_ERR(field_var)) {
- hist_err("onmax: Couldn't create field variable: ", param);
- ret = PTR_ERR(field_var);
- kfree(param);
- goto out;
- }
-
- hist_data->max_vars[hist_data->n_max_vars++] = field_var;
- if (field_var->val->flags & HIST_FIELD_FL_STRING)
- hist_data->n_max_var_str++;
-
- kfree(param);
- }
+ ret = action_create(hist_data, data);
out:
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;
int ret = 0;
while (params) {
- if (data->n_params >= SYNTH_FIELDS_MAX)
+ if (data->n_params >= SYNTH_FIELDS_MAX) {
+ hist_err(tr, HIST_ERR_TOO_MANY_PARAMS, 0);
goto out;
+ }
param = strsep(¶ms, ",");
if (!param) {
+ hist_err(tr, 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(tr, HIST_ERR_INVALID_PARAM, errpos(param));
ret = -EINVAL;
goto out;
}
@@ -3426,88 +3891,164 @@
goto out;
}
+ if (first_param && data->use_trace_keyword) {
+ data->synth_event_name = saved_param;
+ first_param = false;
+ continue;
+ }
+ first_param = false;
+
data->params[data->n_params++] = saved_param;
}
out:
return ret;
}
-static struct action_data *onmax_parse(char *str)
+static int action_parse(struct trace_array *tr, char *str, struct action_data *data,
+ enum handler_id handler)
{
- char *onmax_fn_name, *onmax_var_str;
+ char *action_name;
+ int ret = 0;
+
+ strsep(&str, ".");
+ if (!str) {
+ hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ action_name = strsep(&str, "(");
+ if (!action_name || !str) {
+ hist_err(tr, HIST_ERR_ACTION_NOT_FOUND, 0);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (str_has_prefix(action_name, "save")) {
+ char *params = strsep(&str, ")");
+
+ if (!params) {
+ hist_err(tr, HIST_ERR_NO_SAVE_PARAMS, 0);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = parse_action_params(tr, params, data);
+ if (ret)
+ goto out;
+
+ if (handler == HANDLER_ONMAX)
+ data->track_data.check_val = check_track_val_max;
+ else if (handler == HANDLER_ONCHANGE)
+ data->track_data.check_val = check_track_val_changed;
+ else {
+ hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
+ ret = -EINVAL;
+ goto out;
+ }
+
+ data->track_data.save_data = save_track_data_vars;
+ data->fn = ontrack_action;
+ data->action = ACTION_SAVE;
+ } else if (str_has_prefix(action_name, "snapshot")) {
+ char *params = strsep(&str, ")");
+
+ if (!str) {
+ hist_err(tr, HIST_ERR_NO_CLOSING_PAREN, errpos(params));
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (handler == HANDLER_ONMAX)
+ data->track_data.check_val = check_track_val_max;
+ else if (handler == HANDLER_ONCHANGE)
+ data->track_data.check_val = check_track_val_changed;
+ else {
+ hist_err(tr, HIST_ERR_ACTION_MISMATCH, errpos(action_name));
+ ret = -EINVAL;
+ goto out;
+ }
+
+ data->track_data.save_data = save_track_data_snapshot;
+ data->fn = ontrack_action;
+ data->action = ACTION_SNAPSHOT;
+ } else {
+ char *params = strsep(&str, ")");
+
+ if (str_has_prefix(action_name, "trace"))
+ data->use_trace_keyword = true;
+
+ if (params) {
+ ret = parse_action_params(tr, params, data);
+ if (ret)
+ goto out;
+ }
+
+ if (handler == HANDLER_ONMAX)
+ data->track_data.check_val = check_track_val_max;
+ else if (handler == HANDLER_ONCHANGE)
+ data->track_data.check_val = check_track_val_changed;
+
+ if (handler != HANDLER_ONMATCH) {
+ data->track_data.save_data = action_trace;
+ data->fn = ontrack_action;
+ } else
+ data->fn = action_trace;
+
+ data->action = ACTION_TRACE;
+ }
+
+ data->action_name = kstrdup(action_name, GFP_KERNEL);
+ if (!data->action_name) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ data->handler = handler;
+ out:
+ return ret;
+}
+
+static struct action_data *track_data_parse(struct hist_trigger_data *hist_data,
+ char *str, enum handler_id handler)
+{
struct action_data *data;
int ret = -EINVAL;
+ char *var_str;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return ERR_PTR(-ENOMEM);
- onmax_var_str = strsep(&str, ")");
- if (!onmax_var_str || !str) {
+ var_str = strsep(&str, ")");
+ if (!var_str || !str) {
ret = -EINVAL;
goto free;
}
- data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL);
- if (!data->onmax.var_str) {
+ data->track_data.var_str = kstrdup(var_str, GFP_KERNEL);
+ if (!data->track_data.var_str) {
ret = -ENOMEM;
goto free;
}
- strsep(&str, ".");
- if (!str)
+ ret = action_parse(hist_data->event_file->tr, str, data, handler);
+ if (ret)
goto free;
-
- onmax_fn_name = strsep(&str, "(");
- if (!onmax_fn_name || !str)
- goto free;
-
- if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) {
- char *params = strsep(&str, ")");
-
- if (!params) {
- ret = -EINVAL;
- goto free;
- }
-
- ret = parse_action_params(params, data);
- if (ret)
- goto free;
- } else
- goto free;
-
- data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL);
- if (!data->onmax.fn_name) {
- ret = -ENOMEM;
- goto free;
- }
out:
return data;
free:
- onmax_destroy(data);
+ track_data_destroy(hist_data, data);
data = ERR_PTR(ret);
goto out;
}
static void onmatch_destroy(struct action_data *data)
{
- unsigned int i;
+ kfree(data->match_data.event);
+ kfree(data->match_data.event_system);
- mutex_lock(&synth_event_mutex);
-
- kfree(data->onmatch.match_event);
- kfree(data->onmatch.match_event_system);
- kfree(data->onmatch.synth_event_name);
-
- for (i = 0; i < data->n_params; i++)
- kfree(data->params[i]);
-
- if (data->onmatch.synth_event)
- data->onmatch.synth_event->ref--;
-
- kfree(data);
-
- mutex_unlock(&synth_event_mutex);
+ action_data_destroy(data);
}
static void destroy_field_var(struct field_var *field_var)
@@ -3539,23 +4080,6 @@
}
-static void destroy_synth_var_refs(struct hist_trigger_data *hist_data)
-{
- unsigned int i;
-
- for (i = 0; i < hist_data->n_synth_var_refs; i++)
- destroy_hist_field(hist_data->synth_var_refs[i], 0);
-}
-
-static void save_synth_var_ref(struct hist_trigger_data *hist_data,
- struct hist_field *var_ref)
-{
- hist_data->synth_var_refs[hist_data->n_synth_var_refs++] = var_ref;
-
- hist_data->var_refs[hist_data->n_var_refs] = var_ref;
- var_ref->var_ref_idx = hist_data->n_var_refs++;
-}
-
static int check_synth_field(struct synth_event *event,
struct hist_field *hist_field,
unsigned int field_pos)
@@ -3574,33 +4098,35 @@
}
static struct hist_field *
-onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
- char *system, char *event, char *var)
+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 '$' */
hist_field = find_target_event_var(hist_data, system, event, var);
if (!hist_field) {
- if (!system) {
- system = data->onmatch.match_event_system;
- event = data->onmatch.match_event;
+ if (!system && data->handler == HANDLER_ONMATCH) {
+ system = data->match_data.event_system;
+ event = data->match_data.event;
}
hist_field = find_event_var(hist_data, system, event, var);
}
if (!hist_field)
- hist_err_event("onmatch: Couldn't find onmatch param: $", system, event, var);
+ hist_err(tr, HIST_ERR_PARAM_NOT_FOUND, errpos(var));
return hist_field;
}
static struct hist_field *
-onmatch_create_field_var(struct hist_trigger_data *hist_data,
- struct action_data *data, char *system,
- char *event, char *var)
+trace_action_create_field_var(struct hist_trigger_data *hist_data,
+ struct action_data *data, char *system,
+ char *event, char *var)
{
struct hist_field *hist_field = NULL;
struct field_var *field_var;
@@ -3623,9 +4149,9 @@
* looking for fields on the onmatch(system.event.xxx)
* event.
*/
- if (!system) {
- system = data->onmatch.match_event_system;
- event = data->onmatch.match_event;
+ if (!system && data->handler == HANDLER_ONMATCH) {
+ system = data->match_data.event_system;
+ event = data->match_data.event;
}
/*
@@ -3647,26 +4173,32 @@
goto out;
}
-static int onmatch_create(struct hist_trigger_data *hist_data,
- struct trace_event_file *file,
- struct action_data *data)
+static int trace_action_create(struct hist_trigger_data *hist_data,
+ struct action_data *data)
{
+ struct trace_array *tr = hist_data->event_file->tr;
char *event_name, *param, *system = NULL;
struct hist_field *hist_field, *var_ref;
unsigned int i, var_ref_idx;
unsigned int field_pos = 0;
struct synth_event *event;
+ char *synth_event_name;
int ret = 0;
- mutex_lock(&synth_event_mutex);
- event = find_synth_event(data->onmatch.synth_event_name);
+ lockdep_assert_held(&event_mutex);
+
+ if (data->use_trace_keyword)
+ synth_event_name = data->synth_event_name;
+ else
+ synth_event_name = data->action_name;
+
+ event = find_synth_event(synth_event_name);
if (!event) {
- hist_err("onmatch: Couldn't find synthetic event: ", data->onmatch.synth_event_name);
- mutex_unlock(&synth_event_mutex);
+ hist_err(tr, HIST_ERR_SYNTH_EVENT_NOT_FOUND, errpos(synth_event_name));
return -EINVAL;
}
+
event->ref++;
- mutex_unlock(&synth_event_mutex);
var_ref_idx = hist_data->n_var_refs;
@@ -3693,13 +4225,15 @@
}
if (param[0] == '$')
- hist_field = onmatch_find_var(hist_data, data, system,
- event_name, param);
+ hist_field = trace_action_find_var(hist_data, data,
+ system, event_name,
+ param);
else
- hist_field = onmatch_create_field_var(hist_data, data,
- system,
- event_name,
- param);
+ hist_field = trace_action_create_field_var(hist_data,
+ data,
+ system,
+ event_name,
+ param);
if (!hist_field) {
kfree(p);
@@ -3708,49 +4242,112 @@
}
if (check_synth_field(event, hist_field, field_pos) == 0) {
- var_ref = create_var_ref(hist_field, system, event_name);
+ var_ref = create_var_ref(hist_data, hist_field,
+ system, event_name);
if (!var_ref) {
kfree(p);
ret = -ENOMEM;
goto err;
}
- save_synth_var_ref(hist_data, var_ref);
field_pos++;
kfree(p);
continue;
}
- hist_err_event("onmatch: Param type doesn't match synthetic event field type: ",
- system, event_name, 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("onmatch: Param count doesn't match synthetic event field count: ", event->name);
+ hist_err(tr, HIST_ERR_SYNTH_COUNT_MISMATCH, errpos(event->name));
ret = -EINVAL;
goto err;
}
- data->fn = action_trace;
- data->onmatch.synth_event = event;
- data->onmatch.var_ref_idx = var_ref_idx;
+ data->synth_event = event;
+ data->var_ref_idx = var_ref_idx;
out:
return ret;
err:
- mutex_lock(&synth_event_mutex);
event->ref--;
- mutex_unlock(&synth_event_mutex);
goto out;
}
+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;
+ char *param;
+ int ret = 0;
+
+ if (data->action == ACTION_TRACE)
+ return trace_action_create(hist_data, data);
+
+ if (data->action == ACTION_SNAPSHOT) {
+ track_data = track_data_alloc(hist_data->key_size, data, hist_data);
+ if (IS_ERR(track_data)) {
+ ret = PTR_ERR(track_data);
+ goto out;
+ }
+
+ ret = tracing_snapshot_cond_enable(file->tr, track_data,
+ cond_snapshot_update);
+ if (ret)
+ track_data_free(track_data);
+
+ goto out;
+ }
+
+ if (data->action == ACTION_SAVE) {
+ if (hist_data->n_save_vars) {
+ ret = -EEXIST;
+ hist_err(tr, HIST_ERR_TOO_MANY_SAVE_ACTIONS, 0);
+ goto out;
+ }
+
+ for (i = 0; i < data->n_params; i++) {
+ param = kstrdup(data->params[i], GFP_KERNEL);
+ if (!param) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ field_var = create_target_field_var(hist_data, NULL, NULL, param);
+ if (IS_ERR(field_var)) {
+ hist_err(tr, HIST_ERR_FIELD_VAR_CREATE_FAIL,
+ errpos(param));
+ ret = PTR_ERR(field_var);
+ kfree(param);
+ goto out;
+ }
+
+ hist_data->save_vars[hist_data->n_save_vars++] = field_var;
+ if (field_var->val->flags & HIST_FIELD_FL_STRING)
+ hist_data->n_save_var_str++;
+ kfree(param);
+ }
+ }
+ out:
+ return ret;
+}
+
+static int onmatch_create(struct hist_trigger_data *hist_data,
+ struct action_data *data)
+{
+ return action_create(hist_data, data);
+}
+
static struct action_data *onmatch_parse(struct trace_array *tr, char *str)
{
char *match_event, *match_event_system;
- char *synth_event_name, *params;
struct action_data *data;
int ret = -EINVAL;
@@ -3760,59 +4357,34 @@
match_event = strsep(&str, ")");
if (!match_event || !str) {
- hist_err("onmatch: Missing closing paren: ", 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("onmatch: Missing subsystem for match event: ", 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_event("onmatch: Invalid subsystem or event name: ",
- match_event_system, match_event, NULL);
+ hist_err(tr, HIST_ERR_INVALID_SUBSYS_EVENT, errpos(match_event));
goto free;
}
- data->onmatch.match_event = kstrdup(match_event, GFP_KERNEL);
- if (!data->onmatch.match_event) {
+ data->match_data.event = kstrdup(match_event, GFP_KERNEL);
+ if (!data->match_data.event) {
ret = -ENOMEM;
goto free;
}
- data->onmatch.match_event_system = kstrdup(match_event_system, GFP_KERNEL);
- if (!data->onmatch.match_event_system) {
+ data->match_data.event_system = kstrdup(match_event_system, GFP_KERNEL);
+ if (!data->match_data.event_system) {
ret = -ENOMEM;
goto free;
}
- strsep(&str, ".");
- if (!str) {
- hist_err("onmatch: Missing . after onmatch(): ", str);
- goto free;
- }
-
- synth_event_name = strsep(&str, "(");
- if (!synth_event_name || !str) {
- hist_err("onmatch: Missing opening paramlist paren: ", synth_event_name);
- goto free;
- }
-
- data->onmatch.synth_event_name = kstrdup(synth_event_name, GFP_KERNEL);
- if (!data->onmatch.synth_event_name) {
- ret = -ENOMEM;
- goto free;
- }
-
- params = strsep(&str, ")");
- if (!params || !str || (str && strlen(str))) {
- hist_err("onmatch: Missing closing paramlist paren: ", params);
- goto free;
- }
-
- ret = parse_action_params(params, data);
+ ret = action_parse(tr, str, data, HANDLER_ONMATCH);
if (ret)
goto free;
out:
@@ -3881,13 +4453,14 @@
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("Variable already defined: ", var_name);
+ hist_err(tr, HIST_ERR_DUPLICATE_VAR, errpos(var_name));
return -EINVAL;
}
@@ -3944,8 +4517,8 @@
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;
@@ -3967,8 +4540,8 @@
goto out;
}
- if (hist_field->flags & HIST_FIELD_FL_VAR_REF) {
- hist_err("Using variable references as keys not supported: ", field_str);
+ if (field_has_hist_vars(hist_field, 0)) {
+ hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str));
destroy_hist_field(hist_field, 0);
ret = -EINVAL;
goto out;
@@ -4069,6 +4642,7 @@
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;
@@ -4082,13 +4656,14 @@
var_name = strsep(&field_str, "=");
if (!var_name || !field_str) {
- hist_err("Malformed assignment: ", 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("Too many variables defined: ", var_name);
+ hist_err(tr, HIST_ERR_TOO_MANY_VARS, errpos(var_name));
ret = -EINVAL;
goto free;
}
@@ -4252,10 +4827,11 @@
for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i];
- if (data->fn == action_trace)
+ if (data->handler == HANDLER_ONMATCH)
onmatch_destroy(data);
- else if (data->fn == onmax_save)
- onmax_destroy(data);
+ else if (data->handler == HANDLER_ONMAX ||
+ data->handler == HANDLER_ONCHANGE)
+ track_data_destroy(hist_data, data);
else
kfree(data);
}
@@ -4268,28 +4844,37 @@
unsigned int i;
int ret = 0;
char *str;
+ int len;
for (i = 0; i < hist_data->attrs->n_actions; i++) {
str = hist_data->attrs->action_str[i];
- if (strncmp(str, "onmatch(", strlen("onmatch(")) == 0) {
- char *action_str = str + strlen("onmatch(");
+ if ((len = str_has_prefix(str, "onmatch("))) {
+ char *action_str = str + len;
data = onmatch_parse(tr, action_str);
if (IS_ERR(data)) {
ret = PTR_ERR(data);
break;
}
- data->fn = action_trace;
- } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) {
- char *action_str = str + strlen("onmax(");
+ } else if ((len = str_has_prefix(str, "onmax("))) {
+ char *action_str = str + len;
- data = onmax_parse(action_str);
+ data = track_data_parse(hist_data, action_str,
+ HANDLER_ONMAX);
if (IS_ERR(data)) {
ret = PTR_ERR(data);
break;
}
- data->fn = onmax_save;
+ } else if ((len = str_has_prefix(str, "onchange("))) {
+ char *action_str = str + len;
+
+ data = track_data_parse(hist_data, action_str,
+ HANDLER_ONCHANGE);
+ if (IS_ERR(data)) {
+ ret = PTR_ERR(data);
+ break;
+ }
} else {
ret = -EINVAL;
break;
@@ -4301,8 +4886,7 @@
return ret;
}
-static int create_actions(struct hist_trigger_data *hist_data,
- struct trace_event_file *file)
+static int create_actions(struct hist_trigger_data *hist_data)
{
struct action_data *data;
unsigned int i;
@@ -4311,14 +4895,18 @@
for (i = 0; i < hist_data->attrs->n_actions; i++) {
data = hist_data->actions[i];
- if (data->fn == action_trace) {
- ret = onmatch_create(hist_data, file, data);
+ if (data->handler == HANDLER_ONMATCH) {
+ ret = onmatch_create(hist_data, data);
if (ret)
- return ret;
- } else if (data->fn == onmax_save) {
- ret = onmax_create(hist_data, data);
+ break;
+ } else if (data->handler == HANDLER_ONMAX ||
+ data->handler == HANDLER_ONCHANGE) {
+ ret = track_data_create(hist_data, data);
if (ret)
- return ret;
+ break;
+ } else {
+ ret = -EINVAL;
+ break;
}
}
@@ -4334,26 +4922,51 @@
for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i];
- if (data->fn == onmax_save)
- onmax_print(m, hist_data, elt, data);
+ if (data->action == ACTION_SNAPSHOT)
+ continue;
+
+ if (data->handler == HANDLER_ONMAX ||
+ data->handler == HANDLER_ONCHANGE)
+ track_data_print(m, hist_data, elt, data);
}
}
-static void print_onmax_spec(struct seq_file *m,
- struct hist_trigger_data *hist_data,
- struct action_data *data)
+static void print_action_spec(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ struct action_data *data)
{
unsigned int i;
- seq_puts(m, ":onmax(");
- seq_printf(m, "%s", data->onmax.var_str);
- seq_printf(m, ").%s(", data->onmax.fn_name);
-
- for (i = 0; i < hist_data->n_max_vars; i++) {
- seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name);
- if (i < hist_data->n_max_vars - 1)
- seq_puts(m, ",");
+ if (data->action == ACTION_SAVE) {
+ for (i = 0; i < hist_data->n_save_vars; i++) {
+ seq_printf(m, "%s", hist_data->save_vars[i]->var->var.name);
+ if (i < hist_data->n_save_vars - 1)
+ seq_puts(m, ",");
+ }
+ } else if (data->action == ACTION_TRACE) {
+ if (data->use_trace_keyword)
+ seq_printf(m, "%s", data->synth_event_name);
+ for (i = 0; i < data->n_params; i++) {
+ if (i || data->use_trace_keyword)
+ seq_puts(m, ",");
+ seq_printf(m, "%s", data->params[i]);
+ }
}
+}
+
+static void print_track_data_spec(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ struct action_data *data)
+{
+ if (data->handler == HANDLER_ONMAX)
+ seq_puts(m, ":onmax(");
+ else if (data->handler == HANDLER_ONCHANGE)
+ seq_puts(m, ":onchange(");
+ seq_printf(m, "%s", data->track_data.var_str);
+ seq_printf(m, ").%s(", data->action_name);
+
+ print_action_spec(m, hist_data, data);
+
seq_puts(m, ")");
}
@@ -4361,18 +4974,12 @@
struct hist_trigger_data *hist_data,
struct action_data *data)
{
- unsigned int i;
+ seq_printf(m, ":onmatch(%s.%s).", data->match_data.event_system,
+ data->match_data.event);
- seq_printf(m, ":onmatch(%s.%s).", data->onmatch.match_event_system,
- data->onmatch.match_event);
+ seq_printf(m, "%s(", data->action_name);
- seq_printf(m, "%s(", data->onmatch.synth_event->name);
-
- for (i = 0; i < data->n_params; i++) {
- if (i)
- seq_puts(m, ",");
- seq_printf(m, "%s", data->params[i]);
- }
+ print_action_spec(m, hist_data, data);
seq_puts(m, ")");
}
@@ -4388,8 +4995,11 @@
for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i];
struct action_data *data_test = hist_data_test->actions[i];
+ char *action_name, *action_name_test;
- if (data->fn != data_test->fn)
+ if (data->handler != data_test->handler)
+ return false;
+ if (data->action != data_test->action)
return false;
if (data->n_params != data_test->n_params)
@@ -4400,22 +5010,30 @@
return false;
}
- if (data->fn == action_trace) {
- if (strcmp(data->onmatch.synth_event_name,
- data_test->onmatch.synth_event_name) != 0)
+ if (data->use_trace_keyword)
+ action_name = data->synth_event_name;
+ else
+ action_name = data->action_name;
+
+ if (data_test->use_trace_keyword)
+ action_name_test = data_test->synth_event_name;
+ else
+ action_name_test = data_test->action_name;
+
+ if (strcmp(action_name, action_name_test) != 0)
+ return false;
+
+ if (data->handler == HANDLER_ONMATCH) {
+ if (strcmp(data->match_data.event_system,
+ data_test->match_data.event_system) != 0)
return false;
- if (strcmp(data->onmatch.match_event_system,
- data_test->onmatch.match_event_system) != 0)
+ if (strcmp(data->match_data.event,
+ data_test->match_data.event) != 0)
return false;
- if (strcmp(data->onmatch.match_event,
- data_test->onmatch.match_event) != 0)
- return false;
- } else if (data->fn == onmax_save) {
- if (strcmp(data->onmax.var_str,
- data_test->onmax.var_str) != 0)
- return false;
- if (strcmp(data->onmax.fn_name,
- data_test->onmax.fn_name) != 0)
+ } else if (data->handler == HANDLER_ONMAX ||
+ data->handler == HANDLER_ONCHANGE) {
+ if (strcmp(data->track_data.var_str,
+ data_test->track_data.var_str) != 0)
return false;
}
}
@@ -4432,10 +5050,11 @@
for (i = 0; i < hist_data->n_actions; i++) {
struct action_data *data = hist_data->actions[i];
- if (data->fn == action_trace)
+ if (data->handler == HANDLER_ONMATCH)
print_onmatch_spec(m, hist_data, data);
- else if (data->fn == onmax_save)
- print_onmax_spec(m, hist_data, data);
+ else if (data->handler == HANDLER_ONMAX ||
+ data->handler == HANDLER_ONCHANGE)
+ print_track_data_spec(m, hist_data, data);
}
}
@@ -4461,7 +5080,6 @@
destroy_actions(hist_data);
destroy_field_vars(hist_data);
destroy_field_var_hists(hist_data);
- destroy_synth_var_refs(hist_data);
kfree(hist_data);
}
@@ -4621,22 +5239,24 @@
/* ensure NULL-termination */
if (size > key_field->size - 1)
size = key_field->size - 1;
- }
- memcpy(compound_key + key_field->offset, key, size);
+ strncpy(compound_key + key_field->offset, (char *)key, size);
+ } else
+ memcpy(compound_key + key_field->offset, key, size);
}
static void
hist_trigger_actions(struct hist_trigger_data *hist_data,
struct tracing_map_elt *elt, void *rec,
- struct ring_buffer_event *rbe, u64 *var_ref_vals)
+ struct ring_buffer_event *rbe, void *key,
+ u64 *var_ref_vals)
{
struct action_data *data;
unsigned int i;
for (i = 0; i < hist_data->n_actions; i++) {
data = hist_data->actions[i];
- data->fn(hist_data, elt, rec, rbe, data, var_ref_vals);
+ data->fn(hist_data, elt, rec, rbe, key, data, var_ref_vals);
}
}
@@ -4649,7 +5269,6 @@
u64 var_ref_vals[TRACING_MAP_VARS_MAX];
char compound_key[HIST_KEY_SIZE_MAX];
struct tracing_map_elt *elt = NULL;
- struct stack_trace stacktrace;
struct hist_field *key_field;
u64 field_contents;
void *key = NULL;
@@ -4661,14 +5280,9 @@
key_field = hist_data->fields[i];
if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
- stacktrace.max_entries = HIST_STACKTRACE_DEPTH;
- stacktrace.entries = entries;
- stacktrace.nr_entries = 0;
- stacktrace.skip = HIST_STACKTRACE_SKIP;
-
- memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE);
- save_stack_trace(&stacktrace);
-
+ memset(entries, 0, HIST_STACKTRACE_SIZE);
+ stack_trace_save(entries, HIST_STACKTRACE_DEPTH,
+ HIST_STACKTRACE_SKIP);
key = entries;
} else {
field_contents = key_field->fn(key_field, elt, rbe, rec);
@@ -4697,7 +5311,7 @@
hist_trigger_elt_update(hist_data, elt, rec, rbe, var_ref_vals);
if (resolve_var_refs(hist_data, key, var_ref_vals, true))
- hist_trigger_actions(hist_data, elt, rec, rbe, var_ref_vals);
+ hist_trigger_actions(hist_data, elt, rec, rbe, key, var_ref_vals);
}
static void hist_trigger_stacktrace_print(struct seq_file *m,
@@ -4709,7 +5323,7 @@
unsigned int i;
for (i = 0; i < max_entries; i++) {
- if (stacktrace_entries[i] == ULONG_MAX)
+ if (!stacktrace_entries[i])
return;
seq_printf(m, "%*c", 1 + spaces, ' ');
@@ -4718,10 +5332,10 @@
}
}
-static void
-hist_trigger_entry_print(struct seq_file *m,
- struct hist_trigger_data *hist_data, void *key,
- struct tracing_map_elt *elt)
+static void hist_trigger_print_key(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ void *key,
+ struct tracing_map_elt *elt)
{
struct hist_field *key_field;
char str[KSYM_SYMBOL_LEN];
@@ -4797,6 +5411,17 @@
seq_puts(m, " ");
seq_puts(m, "}");
+}
+
+static void hist_trigger_entry_print(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ void *key,
+ struct tracing_map_elt *elt)
+{
+ const char *field_name;
+ unsigned int i;
+
+ hist_trigger_print_key(m, hist_data, key, elt);
seq_printf(m, " hitcount: %10llu",
tracing_map_read_sum(elt, HITCOUNT_IDX));
@@ -4863,6 +5488,8 @@
if (n_entries < 0)
n_entries = 0;
+ track_data_snapshot_print(m, hist_data);
+
seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
(u64)atomic64_read(&hist_data->map->hits),
n_entries, (u64)atomic64_read(&hist_data->map->drops));
@@ -4887,11 +5514,6 @@
hist_trigger_show(m, data, n++);
}
- if (have_hist_err()) {
- seq_printf(m, "\nERROR: %s\n", hist_err_str);
- seq_printf(m, " Last command: %s\n", last_hist_cmd);
- }
-
out_unlock:
mutex_unlock(&event_mutex);
@@ -4900,6 +5522,12 @@
static int event_hist_open(struct inode *inode, struct file *file)
{
+ int ret;
+
+ ret = security_locked_down(LOCKDOWN_TRACEFS);
+ if (ret)
+ return ret;
+
return single_open(file, hist_show, file);
}
@@ -5256,6 +5884,7 @@
{
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) {
@@ -5263,7 +5892,7 @@
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(tr, HIST_ERR_NAMED_MISMATCH, errpos(hist_data->attrs->name));
ret = -EINVAL;
goto out;
}
@@ -5284,7 +5913,7 @@
else if (hist_data->attrs->clear)
hist_clear(test);
else {
- hist_err("Hist trigger already exists", NULL);
+ hist_err(tr, HIST_ERR_TRIGGER_EEXIST, 0);
ret = -EEXIST;
}
goto out;
@@ -5292,7 +5921,7 @@
}
new:
if (hist_data->attrs->cont || hist_data->attrs->clear) {
- hist_err("Can't clear or continue a nonexistent hist trigger", NULL);
+ hist_err(tr, HIST_ERR_TRIGGER_ENOENT_CLEAR, 0);
ret = -ENOENT;
goto out;
}
@@ -5317,7 +5946,7 @@
ret = tracing_set_clock(file->tr, hist_data->attrs->clock);
if (ret) {
- hist_err("Couldn't set trace_clock: ", clock);
+ hist_err(tr, HIST_ERR_SET_CLOCK_FAIL, errpos(clock));
goto out;
}
@@ -5450,6 +6079,8 @@
struct synth_event *se;
const char *se_name;
+ lockdep_assert_held(&event_mutex);
+
if (hist_file_check_refs(file))
return;
@@ -5459,12 +6090,10 @@
list_del_rcu(&test->list);
trace_event_trigger_enable_disable(file, 0);
- mutex_lock(&synth_event_mutex);
se_name = trace_event_name(file->event_call);
se = find_synth_event(se_name);
if (se)
se->ref--;
- mutex_unlock(&synth_event_mutex);
update_cond_flag(file);
if (hist_data->enable_timestamps)
@@ -5490,9 +6119,11 @@
char *trigger, *p;
int ret = 0;
+ lockdep_assert_held(&event_mutex);
+
if (glob && strlen(glob)) {
- last_cmd_set(param);
hist_err_clear();
+ last_cmd_set(file, param);
}
if (!param)
@@ -5516,9 +6147,9 @@
p++;
continue;
}
- if (p >= param + strlen(param) - strlen("if") - 1)
+ if (p >= param + strlen(param) - (sizeof("if") - 1) - 1)
return -EINVAL;
- if (*(p + strlen("if")) != ' ' && *(p + strlen("if")) != '\t') {
+ if (*(p + sizeof("if") - 1) != ' ' && *(p + sizeof("if") - 1) != '\t') {
p++;
continue;
}
@@ -5533,7 +6164,7 @@
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);
@@ -5580,14 +6211,10 @@
}
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
-
- mutex_lock(&synth_event_mutex);
se_name = trace_event_name(file->event_call);
se = find_synth_event(se_name);
if (se)
se->ref--;
- mutex_unlock(&synth_event_mutex);
-
ret = 0;
goto out_free;
}
@@ -5611,7 +6238,7 @@
if (has_hist_vars(hist_data))
save_hist_vars(hist_data);
- ret = create_actions(hist_data, file);
+ ret = create_actions(hist_data);
if (ret)
goto out_unreg;
@@ -5623,13 +6250,10 @@
if (ret)
goto out_unreg;
- mutex_lock(&synth_event_mutex);
se_name = trace_event_name(file->event_call);
se = find_synth_event(se_name);
if (se)
se->ref++;
- mutex_unlock(&synth_event_mutex);
-
/* Just return zero, not the number of registered triggers */
ret = 0;
out:
@@ -5812,6 +6436,12 @@
struct dentry *d_tracer;
int err = 0;
+ err = dyn_event_register(&synth_event_ops);
+ if (err) {
+ pr_warn("Could not register synth_event_ops\n");
+ return err;
+ }
+
d_tracer = tracing_init_dentry();
if (IS_ERR(d_tracer)) {
err = PTR_ERR(d_tracer);