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


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