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d509db0473
This patch provides infrastructure for passing source files to --event
directly using:
# perf record --event bpf-file.c command
This patch does following works:
1) Allow passing '.c' file to '--event'. parse_events_load_bpf() is
expanded to allow caller tell it whether the passed file is source
file or object.
2) llvm__compile_bpf() is called to compile the '.c' file, the result
is saved into memory. Use bpf_object__open_buffer() to load the
in-memory object.
Introduces a bpf-script-example.c so we can manually test it:
# perf record --clang-opt "-DLINUX_VERSION_CODE=0x40200" --event ./bpf-script-example.c sleep 1
Note that '--clang-opt' must put before '--event'.
Futher patches will merge it into a testcase so can be tested automatically.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1444826502-49291-10-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* Copyright (C) 2015, Wang Nan <wangnan0@huawei.com>
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* Copyright (C) 2015, Huawei Inc.
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*/
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#ifndef __BPF_LOADER_H
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#define __BPF_LOADER_H
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#include <linux/compiler.h>
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#include <linux/err.h>
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#include <string.h>
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#include "probe-event.h"
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#include "debug.h"
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struct bpf_object;
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#define PERF_BPF_PROBE_GROUP "perf_bpf_probe"
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typedef int (*bpf_prog_iter_callback_t)(struct probe_trace_event *tev,
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int fd, void *arg);
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#ifdef HAVE_LIBBPF_SUPPORT
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struct bpf_object *bpf__prepare_load(const char *filename, bool source);
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void bpf__clear(void);
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int bpf__probe(struct bpf_object *obj);
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int bpf__unprobe(struct bpf_object *obj);
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int bpf__strerror_probe(struct bpf_object *obj, int err,
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char *buf, size_t size);
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int bpf__load(struct bpf_object *obj);
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int bpf__strerror_load(struct bpf_object *obj, int err,
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char *buf, size_t size);
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int bpf__foreach_tev(struct bpf_object *obj,
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bpf_prog_iter_callback_t func, void *arg);
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#else
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static inline struct bpf_object *
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bpf__prepare_load(const char *filename __maybe_unused,
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bool source __maybe_unused)
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{
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pr_debug("ERROR: eBPF object loading is disabled during compiling.\n");
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return ERR_PTR(-ENOTSUP);
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}
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static inline void bpf__clear(void) { }
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static inline int bpf__probe(struct bpf_object *obj __maybe_unused) { return 0;}
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static inline int bpf__unprobe(struct bpf_object *obj __maybe_unused) { return 0;}
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static inline int bpf__load(struct bpf_object *obj __maybe_unused) { return 0; }
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static inline int
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bpf__foreach_tev(struct bpf_object *obj __maybe_unused,
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bpf_prog_iter_callback_t func __maybe_unused,
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void *arg __maybe_unused)
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{
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return 0;
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}
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static inline int
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__bpf_strerror(char *buf, size_t size)
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{
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if (!size)
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return 0;
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strncpy(buf,
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"ERROR: eBPF object loading is disabled during compiling.\n",
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size);
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buf[size - 1] = '\0';
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return 0;
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}
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static inline int
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bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
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int err __maybe_unused,
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char *buf, size_t size)
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{
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return __bpf_strerror(buf, size);
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}
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static inline int bpf__strerror_load(struct bpf_object *obj __maybe_unused,
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int err __maybe_unused,
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char *buf, size_t size)
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{
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return __bpf_strerror(buf, size);
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}
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#endif
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#endif
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