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Linux/tools/perf/tests/bpf-script-example.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * bpf-script-example.c
  4  * Test basic LLVM building
  5  */
  6 #ifndef LINUX_VERSION_CODE
  7 # error Need LINUX_VERSION_CODE
  8 # error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
  9 #endif
 10 #define BPF_ANY 0
 11 #define BPF_MAP_TYPE_ARRAY 2
 12 #define BPF_FUNC_map_lookup_elem 1
 13 #define BPF_FUNC_map_update_elem 2
 14 
 15 static void *(*bpf_map_lookup_elem)(void *map, void *key) =
 16         (void *) BPF_FUNC_map_lookup_elem;
 17 static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) =
 18         (void *) BPF_FUNC_map_update_elem;
 19 
 20 struct bpf_map_def {
 21         unsigned int type;
 22         unsigned int key_size;
 23         unsigned int value_size;
 24         unsigned int max_entries;
 25 };
 26 
 27 #define SEC(NAME) __attribute__((section(NAME), used))
 28 struct bpf_map_def SEC("maps") flip_table = {
 29         .type = BPF_MAP_TYPE_ARRAY,
 30         .key_size = sizeof(int),
 31         .value_size = sizeof(int),
 32         .max_entries = 1,
 33 };
 34 
 35 SEC("func=do_epoll_wait")
 36 int bpf_func__SyS_epoll_pwait(void *ctx)
 37 {
 38         int ind =0;
 39         int *flag = bpf_map_lookup_elem(&flip_table, &ind);
 40         int new_flag;
 41         if (!flag)
 42                 return 0;
 43         /* flip flag and store back */
 44         new_flag = !*flag;
 45         bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY);
 46         return new_flag;
 47 }
 48 char _license[] SEC("license") = "GPL";
 49 int _version SEC("version") = LINUX_VERSION_CODE;
 50 

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