// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2026 Valve Corporation.
 * Author: Changwoo Min <changwoo@igalia.com>
 */

#include <test_progs.h>
#include <sys/syscall.h>
#include "test_ctx.skel.h"

void test_exe_ctx(void)
{
        LIBBPF_OPTS(bpf_test_run_opts, opts);
        cpu_set_t old_cpuset, target_cpuset;
        struct test_ctx *skel;
        int err, prog_fd;

        /* 1. Pin the current process to CPU 0. */
        if (sched_getaffinity(0, sizeof(old_cpuset), &old_cpuset) == 0) {
                CPU_ZERO(&target_cpuset);
                CPU_SET(0, &target_cpuset);
                ASSERT_OK(sched_setaffinity(0, sizeof(target_cpuset),
                                            &target_cpuset), "setaffinity");
        }

        skel = test_ctx__open_and_load();
        if (!ASSERT_OK_PTR(skel, "skel_load"))
                goto restore_affinity;

        err = test_ctx__attach(skel);
        if (!ASSERT_OK(err, "skel_attach"))
                goto cleanup;

        /* 2. When we run this, the kernel will execute the BPF prog on CPU 0. */
        prog_fd = bpf_program__fd(skel->progs.trigger_all_contexts);
        err = bpf_prog_test_run_opts(prog_fd, &opts);
        ASSERT_OK(err, "test_run_trigger");

        /* 3. Wait for the local CPU's softirq/tasklet to finish. */
        for (int i = 0; i < 1000; i++) {
                if (skel->bss->count_task > 0 &&
                    skel->bss->count_hardirq > 0 &&
                    skel->bss->count_softirq > 0)
                        break;
                usleep(1000); /* Wait 1ms per iteration, up to 1 sec total */
        }

        /* On CPU 0, these should now all be non-zero. */
        ASSERT_GT(skel->bss->count_task, 0, "task_ok");
        ASSERT_GT(skel->bss->count_hardirq, 0, "hardirq_ok");
        ASSERT_GT(skel->bss->count_softirq, 0, "softirq_ok");

cleanup:
        test_ctx__destroy(skel);

restore_affinity:
        ASSERT_OK(sched_setaffinity(0, sizeof(old_cpuset), &old_cpuset),
                  "restore_affinity");
}