Initial import with encap-forward example

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

headers/linux/perf-sys.h

@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copied from $(LINUX)/tools/perf/perf-sys.h (kernel 4.18) */
+#ifndef _PERF_SYS_H
+#define _PERF_SYS_H
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+#include <linux/types.h>
+#include <linux/perf_event.h>
+/*
+ * remove the following headers to allow for userspace program compilation
+ * #include <linux/compiler.h>
+ * #include <asm/barrier.h>
+ */
+#ifdef __powerpc__
+#define CPUINFO_PROC	{"cpu"}
+#endif
+
+#ifdef __s390__
+#define CPUINFO_PROC	{"vendor_id"}
+#endif
+
+#ifdef __sh__
+#define CPUINFO_PROC	{"cpu type"}
+#endif
+
+#ifdef __hppa__
+#define CPUINFO_PROC	{"cpu"}
+#endif
+
+#ifdef __sparc__
+#define CPUINFO_PROC	{"cpu"}
+#endif
+
+#ifdef __alpha__
+#define CPUINFO_PROC	{"cpu model"}
+#endif
+
+#ifdef __arm__
+#define CPUINFO_PROC	{"model name", "Processor"}
+#endif
+
+#ifdef __mips__
+#define CPUINFO_PROC	{"cpu model"}
+#endif
+
+#ifdef __arc__
+#define CPUINFO_PROC	{"Processor"}
+#endif
+
+#ifdef __xtensa__
+#define CPUINFO_PROC	{"core ID"}
+#endif
+
+#ifndef CPUINFO_PROC
+#define CPUINFO_PROC	{ "model name", }
+#endif
+
+static inline int
+sys_perf_event_open(struct perf_event_attr *attr,
+		      pid_t pid, int cpu, int group_fd,
+		      unsigned long flags)
+{
+	int fd;
+
+	fd = syscall(__NR_perf_event_open, attr, pid, cpu,
+		     group_fd, flags);
+
+#ifdef HAVE_ATTR_TEST
+	if (unlikely(test_attr__enabled))
+		test_attr__open(attr, pid, cpu, fd, group_fd, flags);
+#endif
+	return fd;
+}
+
+#endif /* _PERF_SYS_H */