1025bd7c7SSong Liu // SPDX-License-Identifier: GPL-2.0 2025bd7c7SSong Liu /* Copyright (c) 2021 Facebook */ 3025bd7c7SSong Liu #include "vmlinux.h" 4025bd7c7SSong Liu #include <bpf/bpf_helpers.h> 5025bd7c7SSong Liu #include <bpf/bpf_tracing.h> 6025bd7c7SSong Liu 7025bd7c7SSong Liu char _license[] SEC("license") = "GPL"; 8025bd7c7SSong Liu 9025bd7c7SSong Liu __u64 test1_hits = 0; 10025bd7c7SSong Liu __u64 address_low = 0; 11025bd7c7SSong Liu __u64 address_high = 0; 12025bd7c7SSong Liu int wasted_entries = 0; 13025bd7c7SSong Liu long total_entries = 0; 14025bd7c7SSong Liu 15025bd7c7SSong Liu #define ENTRY_CNT 32 16025bd7c7SSong Liu struct perf_branch_entry entries[ENTRY_CNT] = {}; 17025bd7c7SSong Liu gbs_in_range(__u64 val)18*f9bff0e3SMatthew Wilcox (Oracle)static inline bool gbs_in_range(__u64 val) 19025bd7c7SSong Liu { 20025bd7c7SSong Liu return (val >= address_low) && (val < address_high); 21025bd7c7SSong Liu } 22025bd7c7SSong Liu 23025bd7c7SSong Liu SEC("fexit/bpf_testmod_loop_test") BPF_PROG(test1,int n,int ret)24025bd7c7SSong Liuint BPF_PROG(test1, int n, int ret) 25025bd7c7SSong Liu { 26025bd7c7SSong Liu long i; 27025bd7c7SSong Liu 28025bd7c7SSong Liu total_entries = bpf_get_branch_snapshot(entries, sizeof(entries), 0); 29025bd7c7SSong Liu total_entries /= sizeof(struct perf_branch_entry); 30025bd7c7SSong Liu 31025bd7c7SSong Liu for (i = 0; i < ENTRY_CNT; i++) { 32025bd7c7SSong Liu if (i >= total_entries) 33025bd7c7SSong Liu break; 34*f9bff0e3SMatthew Wilcox (Oracle) if (gbs_in_range(entries[i].from) && gbs_in_range(entries[i].to)) 35025bd7c7SSong Liu test1_hits++; 36025bd7c7SSong Liu else if (!test1_hits) 37025bd7c7SSong Liu wasted_entries++; 38025bd7c7SSong Liu } 39025bd7c7SSong Liu return 0; 40025bd7c7SSong Liu } 41