v4.19.13 snapshot.
diff --git a/tools/perf/util/perf-hooks.c b/tools/perf/util/perf-hooks.c
new file mode 100644
index 0000000..4f3aa8d
--- /dev/null
+++ b/tools/perf/util/perf-hooks.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * perf_hooks.c
+ *
+ * Copyright (C) 2016 Wang Nan <wangnan0@huawei.com>
+ * Copyright (C) 2016 Huawei Inc.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include "util/util.h"
+#include "util/debug.h"
+#include "util/perf-hooks.h"
+
+static sigjmp_buf jmpbuf;
+static const struct perf_hook_desc *current_perf_hook;
+
+void perf_hooks__invoke(const struct perf_hook_desc *desc)
+{
+ if (!(desc && desc->p_hook_func && *desc->p_hook_func))
+ return;
+
+ if (sigsetjmp(jmpbuf, 1)) {
+ pr_warning("Fatal error (SEGFAULT) in perf hook '%s'\n",
+ desc->hook_name);
+ *(current_perf_hook->p_hook_func) = NULL;
+ } else {
+ current_perf_hook = desc;
+ (**desc->p_hook_func)(desc->hook_ctx);
+ }
+ current_perf_hook = NULL;
+}
+
+void perf_hooks__recover(void)
+{
+ if (current_perf_hook)
+ siglongjmp(jmpbuf, 1);
+}
+
+#define PERF_HOOK(name) \
+perf_hook_func_t __perf_hook_func_##name = NULL; \
+struct perf_hook_desc __perf_hook_desc_##name = \
+ {.hook_name = #name, \
+ .p_hook_func = &__perf_hook_func_##name, \
+ .hook_ctx = NULL};
+#include "perf-hooks-list.h"
+#undef PERF_HOOK
+
+#define PERF_HOOK(name) \
+ &__perf_hook_desc_##name,
+
+static struct perf_hook_desc *perf_hooks[] = {
+#include "perf-hooks-list.h"
+};
+#undef PERF_HOOK
+
+int perf_hooks__set_hook(const char *hook_name,
+ perf_hook_func_t hook_func,
+ void *hook_ctx)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
+ if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
+ continue;
+
+ if (*(perf_hooks[i]->p_hook_func))
+ pr_warning("Overwrite existing hook: %s\n", hook_name);
+ *(perf_hooks[i]->p_hook_func) = hook_func;
+ perf_hooks[i]->hook_ctx = hook_ctx;
+ return 0;
+ }
+ return -ENOENT;
+}
+
+perf_hook_func_t perf_hooks__get_hook(const char *hook_name)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(perf_hooks); i++) {
+ if (strcmp(hook_name, perf_hooks[i]->hook_name) != 0)
+ continue;
+
+ return *(perf_hooks[i]->p_hook_func);
+ }
+ return ERR_PTR(-ENOENT);
+}