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Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c151
1 files changed, 64 insertions, 87 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index bc677cd64224..c88bbfe75d1d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -512,12 +512,6 @@ int call_filter_check_discard(struct trace_event_call *call, void *rec,
return 0;
}
-void trace_free_pid_list(struct trace_pid_list *pid_list)
-{
- vfree(pid_list->pids);
- kfree(pid_list);
-}
-
/**
* trace_find_filtered_pid - check if a pid exists in a filtered_pid list
* @filtered_pids: The list of pids to check
@@ -528,14 +522,7 @@ void trace_free_pid_list(struct trace_pid_list *pid_list)
bool
trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid)
{
- /*
- * If pid_max changed after filtered_pids was created, we
- * by default ignore all pids greater than the previous pid_max.
- */
- if (search_pid >= filtered_pids->pid_max)
- return false;
-
- return test_bit(search_pid, filtered_pids->pids);
+ return trace_pid_list_is_set(filtered_pids, search_pid);
}
/**
@@ -592,15 +579,11 @@ void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
return;
}
- /* Sorry, but we don't support pid_max changing after setting */
- if (task->pid >= pid_list->pid_max)
- return;
-
/* "self" is set for forks, and NULL for exits */
if (self)
- set_bit(task->pid, pid_list->pids);
+ trace_pid_list_set(pid_list, task->pid);
else
- clear_bit(task->pid, pid_list->pids);
+ trace_pid_list_clear(pid_list, task->pid);
}
/**
@@ -617,18 +600,19 @@ void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
*/
void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos)
{
- unsigned long pid = (unsigned long)v;
+ long pid = (unsigned long)v;
+ unsigned int next;
(*pos)++;
/* pid already is +1 of the actual previous bit */
- pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid);
+ if (trace_pid_list_next(pid_list, pid, &next) < 0)
+ return NULL;
- /* Return pid + 1 to allow zero to be represented */
- if (pid < pid_list->pid_max)
- return (void *)(pid + 1);
+ pid = next;
- return NULL;
+ /* Return pid + 1 to allow zero to be represented */
+ return (void *)(pid + 1);
}
/**
@@ -645,12 +629,14 @@ void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos)
void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos)
{
unsigned long pid;
+ unsigned int first;
loff_t l = 0;
- pid = find_first_bit(pid_list->pids, pid_list->pid_max);
- if (pid >= pid_list->pid_max)
+ if (trace_pid_list_first(pid_list, &first) < 0)
return NULL;
+ pid = first;
+
/* Return pid + 1 so that zero can be the exit value */
for (pid++; pid && l < *pos;
pid = (unsigned long)trace_pid_next(pid_list, (void *)pid, &l))
@@ -686,7 +672,7 @@ int trace_pid_write(struct trace_pid_list *filtered_pids,
unsigned long val;
int nr_pids = 0;
ssize_t read = 0;
- ssize_t ret = 0;
+ ssize_t ret;
loff_t pos;
pid_t pid;
@@ -699,34 +685,23 @@ int trace_pid_write(struct trace_pid_list *filtered_pids,
* the user. If the operation fails, then the current list is
* not modified.
*/
- pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL);
+ pid_list = trace_pid_list_alloc();
if (!pid_list) {
trace_parser_put(&parser);
return -ENOMEM;
}
- pid_list->pid_max = READ_ONCE(pid_max);
-
- /* Only truncating will shrink pid_max */
- if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max)
- pid_list->pid_max = filtered_pids->pid_max;
-
- pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3);
- if (!pid_list->pids) {
- trace_parser_put(&parser);
- kfree(pid_list);
- return -ENOMEM;
- }
-
if (filtered_pids) {
/* copy the current bits to the new max */
- for_each_set_bit(pid, filtered_pids->pids,
- filtered_pids->pid_max) {
- set_bit(pid, pid_list->pids);
+ ret = trace_pid_list_first(filtered_pids, &pid);
+ while (!ret) {
+ trace_pid_list_set(pid_list, pid);
+ ret = trace_pid_list_next(filtered_pids, pid + 1, &pid);
nr_pids++;
}
}
+ ret = 0;
while (cnt > 0) {
pos = 0;
@@ -742,12 +717,13 @@ int trace_pid_write(struct trace_pid_list *filtered_pids,
ret = -EINVAL;
if (kstrtoul(parser.buffer, 0, &val))
break;
- if (val >= pid_list->pid_max)
- break;
pid = (pid_t)val;
- set_bit(pid, pid_list->pids);
+ if (trace_pid_list_set(pid_list, pid) < 0) {
+ ret = -1;
+ break;
+ }
nr_pids++;
trace_parser_clear(&parser);
@@ -756,13 +732,13 @@ int trace_pid_write(struct trace_pid_list *filtered_pids,
trace_parser_put(&parser);
if (ret < 0) {
- trace_free_pid_list(pid_list);
+ trace_pid_list_free(pid_list);
return ret;
}
if (!nr_pids) {
/* Cleared the list of pids */
- trace_free_pid_list(pid_list);
+ trace_pid_list_free(pid_list);
read = ret;
pid_list = NULL;
}
@@ -1714,7 +1690,8 @@ static void trace_create_maxlat_file(struct trace_array *tr,
{
INIT_WORK(&tr->fsnotify_work, latency_fsnotify_workfn);
init_irq_work(&tr->fsnotify_irqwork, latency_fsnotify_workfn_irq);
- tr->d_max_latency = trace_create_file("tracing_max_latency", 0644,
+ tr->d_max_latency = trace_create_file("tracing_max_latency",
+ TRACE_MODE_WRITE,
d_tracer, &tr->max_latency,
&tracing_max_lat_fops);
}
@@ -1748,8 +1725,8 @@ void latency_fsnotify(struct trace_array *tr)
|| defined(CONFIG_OSNOISE_TRACER)
#define trace_create_maxlat_file(tr, d_tracer) \
- trace_create_file("tracing_max_latency", 0644, d_tracer, \
- &tr->max_latency, &tracing_max_lat_fops)
+ trace_create_file("tracing_max_latency", TRACE_MODE_WRITE, \
+ d_tracer, &tr->max_latency, &tracing_max_lat_fops)
#else
#define trace_create_maxlat_file(tr, d_tracer) do { } while (0)
@@ -6077,7 +6054,7 @@ trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start,
static void trace_create_eval_file(struct dentry *d_tracer)
{
- trace_create_file("eval_map", 0444, d_tracer,
+ trace_create_file("eval_map", TRACE_MODE_READ, d_tracer,
NULL, &tracing_eval_map_fops);
}
@@ -8590,27 +8567,27 @@ tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
}
/* per cpu trace_pipe */
- trace_create_cpu_file("trace_pipe", 0444, d_cpu,
+ trace_create_cpu_file("trace_pipe", TRACE_MODE_READ, d_cpu,
tr, cpu, &tracing_pipe_fops);
/* per cpu trace */
- trace_create_cpu_file("trace", 0644, d_cpu,
+ trace_create_cpu_file("trace", TRACE_MODE_WRITE, d_cpu,
tr, cpu, &tracing_fops);
- trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu,
+ trace_create_cpu_file("trace_pipe_raw", TRACE_MODE_READ, d_cpu,
tr, cpu, &tracing_buffers_fops);
- trace_create_cpu_file("stats", 0444, d_cpu,
+ trace_create_cpu_file("stats", TRACE_MODE_READ, d_cpu,
tr, cpu, &tracing_stats_fops);
- trace_create_cpu_file("buffer_size_kb", 0444, d_cpu,
+ trace_create_cpu_file("buffer_size_kb", TRACE_MODE_READ, d_cpu,
tr, cpu, &tracing_entries_fops);
#ifdef CONFIG_TRACER_SNAPSHOT
- trace_create_cpu_file("snapshot", 0644, d_cpu,
+ trace_create_cpu_file("snapshot", TRACE_MODE_WRITE, d_cpu,
tr, cpu, &snapshot_fops);
- trace_create_cpu_file("snapshot_raw", 0444, d_cpu,
+ trace_create_cpu_file("snapshot_raw", TRACE_MODE_READ, d_cpu,
tr, cpu, &snapshot_raw_fops);
#endif
}
@@ -8816,8 +8793,8 @@ create_trace_option_file(struct trace_array *tr,
topt->opt = opt;
topt->tr = tr;
- topt->entry = trace_create_file(opt->name, 0644, t_options, topt,
- &trace_options_fops);
+ topt->entry = trace_create_file(opt->name, TRACE_MODE_WRITE,
+ t_options, topt, &trace_options_fops);
}
@@ -8892,7 +8869,7 @@ create_trace_option_core_file(struct trace_array *tr,
if (!t_options)
return NULL;
- return trace_create_file(option, 0644, t_options,
+ return trace_create_file(option, TRACE_MODE_WRITE, t_options,
(void *)&tr->trace_flags_index[index],
&trace_options_core_fops);
}
@@ -9417,28 +9394,28 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
struct trace_event_file *file;
int cpu;
- trace_create_file("available_tracers", 0444, d_tracer,
+ trace_create_file("available_tracers", TRACE_MODE_READ, d_tracer,
tr, &show_traces_fops);
- trace_create_file("current_tracer", 0644, d_tracer,
+ trace_create_file("current_tracer", TRACE_MODE_WRITE, d_tracer,
tr, &set_tracer_fops);
- trace_create_file("tracing_cpumask", 0644, d_tracer,
+ trace_create_file("tracing_cpumask", TRACE_MODE_WRITE, d_tracer,
tr, &tracing_cpumask_fops);
- trace_create_file("trace_options", 0644, d_tracer,
+ trace_create_file("trace_options", TRACE_MODE_WRITE, d_tracer,
tr, &tracing_iter_fops);
- trace_create_file("trace", 0644, d_tracer,
+ trace_create_file("trace", TRACE_MODE_WRITE, d_tracer,
tr, &tracing_fops);
- trace_create_file("trace_pipe", 0444, d_tracer,
+ trace_create_file("trace_pipe", TRACE_MODE_READ, d_tracer,
tr, &tracing_pipe_fops);
- trace_create_file("buffer_size_kb", 0644, d_tracer,
+ trace_create_file("buffer_size_kb", TRACE_MODE_WRITE, d_tracer,
tr, &tracing_entries_fops);
- trace_create_file("buffer_total_size_kb", 0444, d_tracer,
+ trace_create_file("buffer_total_size_kb", TRACE_MODE_READ, d_tracer,
tr, &tracing_total_entries_fops);
trace_create_file("free_buffer", 0200, d_tracer,
@@ -9449,25 +9426,25 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
file = __find_event_file(tr, "ftrace", "print");
if (file && file->dir)
- trace_create_file("trigger", 0644, file->dir, file,
- &event_trigger_fops);
+ trace_create_file("trigger", TRACE_MODE_WRITE, file->dir,
+ file, &event_trigger_fops);
tr->trace_marker_file = file;
trace_create_file("trace_marker_raw", 0220, d_tracer,
tr, &tracing_mark_raw_fops);
- trace_create_file("trace_clock", 0644, d_tracer, tr,
+ trace_create_file("trace_clock", TRACE_MODE_WRITE, d_tracer, tr,
&trace_clock_fops);
- trace_create_file("tracing_on", 0644, d_tracer,
+ trace_create_file("tracing_on", TRACE_MODE_WRITE, d_tracer,
tr, &rb_simple_fops);
- trace_create_file("timestamp_mode", 0444, d_tracer, tr,
+ trace_create_file("timestamp_mode", TRACE_MODE_READ, d_tracer, tr,
&trace_time_stamp_mode_fops);
tr->buffer_percent = 50;
- trace_create_file("buffer_percent", 0444, d_tracer,
+ trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer,
tr, &buffer_percent_fops);
create_trace_options_dir(tr);
@@ -9478,11 +9455,11 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
MEM_FAIL(1, "Could not allocate function filter files");
#ifdef CONFIG_TRACER_SNAPSHOT
- trace_create_file("snapshot", 0644, d_tracer,
+ trace_create_file("snapshot", TRACE_MODE_WRITE, d_tracer,
tr, &snapshot_fops);
#endif
- trace_create_file("error_log", 0644, d_tracer,
+ trace_create_file("error_log", TRACE_MODE_WRITE, d_tracer,
tr, &tracing_err_log_fops);
for_each_tracing_cpu(cpu)
@@ -9675,19 +9652,19 @@ static __init int tracer_init_tracefs(void)
init_tracer_tracefs(&global_trace, NULL);
ftrace_init_tracefs_toplevel(&global_trace, NULL);
- trace_create_file("tracing_thresh", 0644, NULL,
+ trace_create_file("tracing_thresh", TRACE_MODE_WRITE, NULL,
&global_trace, &tracing_thresh_fops);
- trace_create_file("README", 0444, NULL,
+ trace_create_file("README", TRACE_MODE_READ, NULL,
NULL, &tracing_readme_fops);
- trace_create_file("saved_cmdlines", 0444, NULL,
+ trace_create_file("saved_cmdlines", TRACE_MODE_READ, NULL,
NULL, &tracing_saved_cmdlines_fops);
- trace_create_file("saved_cmdlines_size", 0644, NULL,
+ trace_create_file("saved_cmdlines_size", TRACE_MODE_WRITE, NULL,
NULL, &tracing_saved_cmdlines_size_fops);
- trace_create_file("saved_tgids", 0444, NULL,
+ trace_create_file("saved_tgids", TRACE_MODE_READ, NULL,
NULL, &tracing_saved_tgids_fops);
trace_eval_init();
@@ -9699,7 +9676,7 @@ static __init int tracer_init_tracefs(void)
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
- trace_create_file("dyn_ftrace_total_info", 0444, NULL,
+ trace_create_file("dyn_ftrace_total_info", TRACE_MODE_READ, NULL,
NULL, &tracing_dyn_info_fops);
#endif
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-29 02:03:47 +0000