[RFC PATCH 03/22] perf: add bpf common operations.

[Wang Nan <wangnan0@huawei.com>]

Add bpf syscall and related structure to perf for bpf loader use.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
---
 tools/perf/perf-sys.h |  6 ++++++
 tools/perf/util/Build |  1 +
 tools/perf/util/bpf.c | 39 +++++++++++++++++++++++++++++++++++++++
 tools/perf/util/bpf.h | 22 ++++++++++++++++++++++
 4 files changed, 68 insertions(+)
 create mode 100644 tools/perf/util/bpf.c
 create mode 100644 tools/perf/util/bpf.h

diff --git a/tools/perf/perf-sys.h b/tools/perf/perf-sys.h
index 6ef6816..b38ca8b 100644
--- a/tools/perf/perf-sys.h
+++ b/tools/perf/perf-sys.h
@@ -22,6 +22,9 @@
 #ifndef __NR_gettid
 # define __NR_gettid 224
 #endif
+#ifndef __NR_bpf
+# define __NR_bpf 357
+#endif
 #endif
 
 #if defined(__x86_64__)
@@ -39,6 +42,9 @@
 #ifndef __NR_gettid
 # define __NR_gettid 186
 #endif
+#ifndef __NR_bpf
+# define __NR_bpf 321
+#endif
 #endif
 
 #ifdef __powerpc__
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 797490a..dfba2f0 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -74,6 +74,7 @@ libperf-y += data.o
 libperf-$(CONFIG_X86) += tsc.o
 libperf-y += cloexec.o
 libperf-y += thread-stack.o
+libperf-y += bpf.o
 
 libperf-$(CONFIG_LIBELF) += symbol-elf.o
 libperf-$(CONFIG_LIBELF) += probe-event.o
diff --git a/tools/perf/util/bpf.c b/tools/perf/util/bpf.c
new file mode 100644
index 0000000..f752723
--- /dev/null
+++ b/tools/perf/util/bpf.c
@@ -0,0 +1,39 @@
+/*
+ * common BPF operations.
+ *
+ * Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
+ * Copyright (C) 2015, Huawei Inc.
+ *
+ * Released under the GPL v2. (and only v2, not any later version)
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <linux/unistd.h>
+#include <unistd.h>
+#include <linux/bpf.h>
+#include <errno.h>
+#include "perf.h"
+#include "bpf.h"
+
+int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, size_t size)
+{
+	return syscall(__NR_bpf, cmd, attr, size);
+}
+
+int bpf_create_map(struct bpf_map_def *map_def)
+{
+	union bpf_attr attr;
+
+	if (!map_def)
+		return -EFAULT;
+
+	bzero(&attr, sizeof(attr));
+
+	attr.map_type    = map_def->type;
+	attr.key_size    = map_def->key_size;
+	attr.value_size  = map_def->value_size;
+	attr.max_entries = map_def->max_entries;
+
+	return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
+}
diff --git a/tools/perf/util/bpf.h b/tools/perf/util/bpf.h
new file mode 100644
index 0000000..be106b0
--- /dev/null
+++ b/tools/perf/util/bpf.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
+ * Copyright (C) 2015, Huawei Inc.
+ *
+ * Released under the GPL v2. (and only v2, not any later version)
+ */
+#ifndef __PERF_BPF_H
+#define __PERF_BPF_H
+
+#include <linux/bpf.h>
+
+struct bpf_map_def {
+	unsigned int type;
+	unsigned int key_size;
+	unsigned int value_size;
+	unsigned int max_entries;
+};
+
+int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, size_t size);
+
+int bpf_create_map(struct bpf_map_def *map_def);
+#endif
-- 
1.8.3.4