Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/tools/perf/util/bpf_map.c b/tools/perf/util/bpf_map.c
new file mode 100644
index 0000000..eb853ca
--- /dev/null
+++ b/tools/perf/util/bpf_map.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+#include "util/bpf_map.h"
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static bool bpf_map_def__is_per_cpu(const struct bpf_map_def *def)
+{
+ return def->type == BPF_MAP_TYPE_PERCPU_HASH ||
+ def->type == BPF_MAP_TYPE_PERCPU_ARRAY ||
+ def->type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
+ def->type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
+}
+
+static void *bpf_map_def__alloc_value(const struct bpf_map_def *def)
+{
+ if (bpf_map_def__is_per_cpu(def))
+ return malloc(round_up(def->value_size, 8) * sysconf(_SC_NPROCESSORS_CONF));
+
+ return malloc(def->value_size);
+}
+
+int bpf_map__fprintf(struct bpf_map *map, FILE *fp)
+{
+ const struct bpf_map_def *def = bpf_map__def(map);
+ void *prev_key = NULL, *key, *value;
+ int fd = bpf_map__fd(map), err;
+ int printed = 0;
+
+ if (fd < 0)
+ return fd;
+
+ if (IS_ERR(def))
+ return PTR_ERR(def);
+
+ err = -ENOMEM;
+ key = malloc(def->key_size);
+ if (key == NULL)
+ goto out;
+
+ value = bpf_map_def__alloc_value(def);
+ if (value == NULL)
+ goto out_free_key;
+
+ while ((err = bpf_map_get_next_key(fd, prev_key, key) == 0)) {
+ int intkey = *(int *)key;
+
+ if (!bpf_map_lookup_elem(fd, key, value)) {
+ bool boolval = *(bool *)value;
+ if (boolval)
+ printed += fprintf(fp, "[%d] = %d,\n", intkey, boolval);
+ } else {
+ printed += fprintf(fp, "[%d] = ERROR,\n", intkey);
+ }
+
+ prev_key = key;
+ }
+
+ if (err == ENOENT)
+ err = printed;
+
+ free(value);
+out_free_key:
+ free(key);
+out:
+ return err;
+}