1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2026 Valve Corporation. 4 * Author: Changwoo Min <changwoo@igalia.com> 5 */ 6 7 #include "vmlinux.h" 8 #include <bpf/bpf_helpers.h> 9 #include <bpf/bpf_tracing.h> 10 #include "bpf_experimental.h" 11 12 char _license[] SEC("license") = "GPL"; 13 14 extern void bpf_kfunc_trigger_ctx_check(void) __ksym; 15 16 int count_hardirq; 17 int count_softirq; 18 int count_task; 19 20 /* Triggered via bpf_prog_test_run from user-space */ 21 SEC("syscall") 22 int trigger_all_contexts(void *ctx) 23 { 24 if (bpf_in_task()) 25 __sync_fetch_and_add(&count_task, 1); 26 27 /* Trigger the firing of a hardirq and softirq for test. */ 28 bpf_kfunc_trigger_ctx_check(); 29 return 0; 30 } 31 32 /* Observer for HardIRQ */ 33 SEC("fentry/bpf_testmod_test_hardirq_fn") 34 int BPF_PROG(on_hardirq) 35 { 36 if (bpf_in_hardirq()) 37 __sync_fetch_and_add(&count_hardirq, 1); 38 return 0; 39 } 40 41 /* Observer for SoftIRQ */ 42 SEC("fentry/bpf_testmod_test_softirq_fn") 43 int BPF_PROG(on_softirq) 44 { 45 if (bpf_in_serving_softirq()) 46 __sync_fetch_and_add(&count_softirq, 1); 47 return 0; 48 } 49