| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* Copyright (c) 2021 Facebook */ |
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| 3 | #include "vmlinux.h" |
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| 4 | #include <bpf/bpf_helpers.h> |
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| 5 | #include <bpf/bpf_tracing.h> |
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| 6 | |
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| 7 | char _license[] SEC("license" ) = "GPL" ; |
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| 8 | |
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| 9 | __u64 test1_hits = 0; |
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| 10 | __u64 address_low = 0; |
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| 11 | __u64 address_high = 0; |
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| 12 | int wasted_entries = 0; |
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| 13 | long total_entries = 0; |
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| 14 | |
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| 15 | #define ENTRY_CNT 32 |
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| 16 | struct perf_branch_entry entries[ENTRY_CNT] = {}; |
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| 17 | |
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| 18 | static inline bool gbs_in_range(__u64 val) |
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| 19 | { |
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| 20 | return (val >= address_low) && (val < address_high); |
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| 21 | } |
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| 22 | |
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| 23 | SEC("fexit/bpf_testmod_loop_test" ) |
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| 24 | int BPF_PROG(test1, int n, int ret) |
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| 25 | { |
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| 26 | long i; |
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| 27 | |
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| 28 | total_entries = bpf_get_branch_snapshot(entries, sizeof(entries), 0); |
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| 29 | total_entries /= sizeof(struct perf_branch_entry); |
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| 30 | |
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| 31 | for (i = 0; i < ENTRY_CNT; i++) { |
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| 32 | if (i >= total_entries) |
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| 33 | break; |
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| 34 | if (gbs_in_range(entries[i].from) && gbs_in_range(entries[i].to)) |
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| 35 | test1_hits++; |
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| 36 | else if (!test1_hits) |
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| 37 | wasted_entries++; |
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| 38 | } |
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| 39 | return 0; |
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| 40 | } |
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| 41 | |
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