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-rw-r--r--arch/powerpc/kernel/ftrace.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index bf99cfa6bbfe..d56848afd2cf 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -484,6 +484,58 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return ret;
}
+static int __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
+{
+ unsigned long ftrace_addr = (unsigned long)FTRACE_ADDR;
+ int ret;
+
+ ret = ftrace_update_record(rec, enable);
+
+ switch (ret) {
+ case FTRACE_UPDATE_IGNORE:
+ return 0;
+ case FTRACE_UPDATE_MAKE_CALL:
+ return ftrace_make_call(rec, ftrace_addr);
+ case FTRACE_UPDATE_MAKE_NOP:
+ return ftrace_make_nop(NULL, rec, ftrace_addr);
+ }
+
+ return 0;
+}
+
+void ftrace_replace_code(int enable)
+{
+ struct ftrace_rec_iter *iter;
+ struct dyn_ftrace *rec;
+ int ret;
+
+ for (iter = ftrace_rec_iter_start(); iter;
+ iter = ftrace_rec_iter_next(iter)) {
+ rec = ftrace_rec_iter_record(iter);
+ ret = __ftrace_replace_code(rec, enable);
+ if (ret) {
+ ftrace_bug(ret, rec->ip);
+ return;
+ }
+ }
+}
+
+void arch_ftrace_update_code(int command)
+{
+ if (command & FTRACE_UPDATE_CALLS)
+ ftrace_replace_code(1);
+ else if (command & FTRACE_DISABLE_CALLS)
+ ftrace_replace_code(0);
+
+ if (command & FTRACE_UPDATE_TRACE_FUNC)
+ ftrace_update_ftrace_func(ftrace_trace_function);
+
+ if (command & FTRACE_START_FUNC_RET)
+ ftrace_enable_ftrace_graph_caller();
+ else if (command & FTRACE_STOP_FUNC_RET)
+ ftrace_disable_ftrace_graph_caller();
+}
+
int __init ftrace_dyn_arch_init(void *data)
{
/* caller expects data to be zero */