tracing: Add support for SOFT_DISABLE to syscall events

The original SOFT_DISABLE patches didn't add support for soft disable
of syscall events; this adds it.

Add an array of ftrace_event_file pointers indexed by syscall number
to the trace array and remove the existing enabled bitmaps, which as a
result are now redundant.  The ftrace_event_file structs in turn
contain the soft disable flags we need for per-syscall soft disable
accounting.

Adding ftrace_event_files also means we can remove the USE_CALL_FILTER
bit, thus enabling multibuffer filter support for syscall events.

Link: http://lkml.kernel.org/r/6e72b566e85d8df8042f133efbc6c30e21fb017e.1382620672.git.tom.zanussi@linux.intel.com

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 34 insertions, 12 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 12d1a612a73e..9c27cdadd71f 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -192,8 +192,8 @@ struct trace_array {
 #ifdef CONFIG_FTRACE_SYSCALLS
         int                     sys_refcount_enter;
         int                     sys_refcount_exit;
-        DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
-        DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
+        struct ftrace_event_file *enter_syscall_files[NR_syscalls];
+        struct ftrace_event_file *exit_syscall_files[NR_syscalls];
 #endif
         int                     stop_count;
         int                     clock_id;
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 32644eece429..e4b6d11bdf78 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -302,6 +302,7 @@ static int __init syscall_exit_define_fields(struct ftrace_event_call *call)
 static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
 {
         struct trace_array *tr = data;
+        struct ftrace_event_file *ftrace_file;
         struct syscall_trace_enter *entry;
         struct syscall_metadata *sys_data;
         struct ring_buffer_event *event;
@@ -314,7 +315,13 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
         syscall_nr = trace_get_syscall_nr(current, regs);
         if (syscall_nr < 0)
                 return;
-        if (!test_bit(syscall_nr, tr->enabled_enter_syscalls))
+
+        /* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE) */
+        ftrace_file = rcu_dereference_sched(tr->enter_syscall_files[syscall_nr]);
+        if (!ftrace_file)
+                return;
+
+        if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
                 return;
 
         sys_data = syscall_nr_to_meta(syscall_nr);
@@ -336,8 +343,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
         entry->nr = syscall_nr;
         syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
 
-        if (!call_filter_check_discard(sys_data->enter_event, entry,
-                                       buffer, event))
+        if (!filter_check_discard(ftrace_file, entry, buffer, event))
                 trace_current_buffer_unlock_commit(buffer, event,
                                                    irq_flags, pc);
 }
@@ -345,6 +351,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
 static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
 {
         struct trace_array *tr = data;
+        struct ftrace_event_file *ftrace_file;
         struct syscall_trace_exit *entry;
         struct syscall_metadata *sys_data;
         struct ring_buffer_event *event;
@@ -356,7 +363,13 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
         syscall_nr = trace_get_syscall_nr(current, regs);
         if (syscall_nr < 0)
                 return;
-        if (!test_bit(syscall_nr, tr->enabled_exit_syscalls))
+
+        /* Here we're inside tp handler's rcu_read_lock_sched (__DO_TRACE()) */
+        ftrace_file = rcu_dereference_sched(tr->exit_syscall_files[syscall_nr]);
+        if (!ftrace_file)
+                return;
+
+        if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
                 return;
 
         sys_data = syscall_nr_to_meta(syscall_nr);
@@ -377,8 +390,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
         entry->nr = syscall_nr;
         entry->ret = syscall_get_return_value(current, regs);
 
-        if (!call_filter_check_discard(sys_data->exit_event, entry,
-                                       buffer, event))
+        if (!filter_check_discard(ftrace_file, entry, buffer, event))
                 trace_current_buffer_unlock_commit(buffer, event,
                                                    irq_flags, pc);
 }
@@ -397,7 +409,7 @@ static int reg_event_syscall_enter(struct ftrace_event_file *file,
         if (!tr->sys_refcount_enter)
                 ret = register_trace_sys_enter(ftrace_syscall_enter, tr);
         if (!ret) {
-                set_bit(num, tr->enabled_enter_syscalls);
+                rcu_assign_pointer(tr->enter_syscall_files[num], file);
                 tr->sys_refcount_enter++;
         }
         mutex_unlock(&syscall_trace_lock);
@@ -415,10 +427,15 @@ static void unreg_event_syscall_enter(struct ftrace_event_file *file,
                 return;
         mutex_lock(&syscall_trace_lock);
         tr->sys_refcount_enter--;
-        clear_bit(num, tr->enabled_enter_syscalls);
+        rcu_assign_pointer(tr->enter_syscall_files[num], NULL);
         if (!tr->sys_refcount_enter)
                 unregister_trace_sys_enter(ftrace_syscall_enter, tr);
         mutex_unlock(&syscall_trace_lock);
+        /*
+         * Callers expect the event to be completely disabled on
+         * return, so wait for current handlers to finish.
+         */
+        synchronize_sched();
 }
 
 static int reg_event_syscall_exit(struct ftrace_event_file *file,
@@ -435,7 +452,7 @@ static int reg_event_syscall_exit(struct ftrace_event_file *file,
         if (!tr->sys_refcount_exit)
                 ret = register_trace_sys_exit(ftrace_syscall_exit, tr);
         if (!ret) {
-                set_bit(num, tr->enabled_exit_syscalls);
+                rcu_assign_pointer(tr->exit_syscall_files[num], file);
                 tr->sys_refcount_exit++;
         }
         mutex_unlock(&syscall_trace_lock);
@@ -453,10 +470,15 @@ static void unreg_event_syscall_exit(struct ftrace_event_file *file,
                 return;
         mutex_lock(&syscall_trace_lock);
         tr->sys_refcount_exit--;
-        clear_bit(num, tr->enabled_exit_syscalls);
+        rcu_assign_pointer(tr->exit_syscall_files[num], NULL);
         if (!tr->sys_refcount_exit)
                 unregister_trace_sys_exit(ftrace_syscall_exit, tr);
         mutex_unlock(&syscall_trace_lock);
+        /*
+         * Callers expect the event to be completely disabled on
+         * return, so wait for current handlers to finish.
+         */
+        synchronize_sched();
 }
 
 static int __init init_syscall_trace(struct ftrace_event_call *call)