Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Kyle Huey | 631 | 100.00% | 1 | 100.00% |
Total | 631 | 1 |
// SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include <test_progs.h> #include "test_perf_skip.skel.h" #include <linux/compiler.h> #include <linux/hw_breakpoint.h> #include <sys/mman.h> #ifndef TRAP_PERF #define TRAP_PERF 6 #endif int sigio_count, sigtrap_count; static void handle_sigio(int sig __always_unused) { ++sigio_count; } static void handle_sigtrap(int signum __always_unused, siginfo_t *info, void *ucontext __always_unused) { ASSERT_EQ(info->si_code, TRAP_PERF, "si_code"); ++sigtrap_count; } static noinline int test_function(void) { asm volatile (""); return 0; } void serial_test_perf_skip(void) { struct sigaction action = {}; struct sigaction previous_sigtrap; sighandler_t previous_sigio = SIG_ERR; struct test_perf_skip *skel = NULL; struct perf_event_attr attr = {}; int perf_fd = -1; int err; struct f_owner_ex owner; struct bpf_link *prog_link = NULL; action.sa_flags = SA_SIGINFO | SA_NODEFER; action.sa_sigaction = handle_sigtrap; sigemptyset(&action.sa_mask); if (!ASSERT_OK(sigaction(SIGTRAP, &action, &previous_sigtrap), "sigaction")) return; previous_sigio = signal(SIGIO, handle_sigio); if (!ASSERT_NEQ(previous_sigio, SIG_ERR, "signal")) goto cleanup; skel = test_perf_skip__open_and_load(); if (!ASSERT_OK_PTR(skel, "skel_load")) goto cleanup; attr.type = PERF_TYPE_BREAKPOINT; attr.size = sizeof(attr); attr.bp_type = HW_BREAKPOINT_X; attr.bp_addr = (uintptr_t)test_function; attr.bp_len = sizeof(long); attr.sample_period = 1; attr.sample_type = PERF_SAMPLE_IP; attr.pinned = 1; attr.exclude_kernel = 1; attr.exclude_hv = 1; attr.precise_ip = 3; attr.sigtrap = 1; attr.remove_on_exec = 1; perf_fd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, 0); if (perf_fd < 0 && (errno == ENOENT || errno == EOPNOTSUPP)) { printf("SKIP:no PERF_TYPE_BREAKPOINT/HW_BREAKPOINT_X\n"); test__skip(); goto cleanup; } if (!ASSERT_OK(perf_fd < 0, "perf_event_open")) goto cleanup; /* Configure the perf event to signal on sample. */ err = fcntl(perf_fd, F_SETFL, O_ASYNC); if (!ASSERT_OK(err, "fcntl(F_SETFL, O_ASYNC)")) goto cleanup; owner.type = F_OWNER_TID; owner.pid = syscall(__NR_gettid); err = fcntl(perf_fd, F_SETOWN_EX, &owner); if (!ASSERT_OK(err, "fcntl(F_SETOWN_EX)")) goto cleanup; /* Allow at most one sample. A sample rejected by bpf should * not count against this. */ err = ioctl(perf_fd, PERF_EVENT_IOC_REFRESH, 1); if (!ASSERT_OK(err, "ioctl(PERF_EVENT_IOC_REFRESH)")) goto cleanup; prog_link = bpf_program__attach_perf_event(skel->progs.handler, perf_fd); if (!ASSERT_OK_PTR(prog_link, "bpf_program__attach_perf_event")) goto cleanup; /* Configure the bpf program to suppress the sample. */ skel->bss->ip = (uintptr_t)test_function; test_function(); ASSERT_EQ(sigio_count, 0, "sigio_count"); ASSERT_EQ(sigtrap_count, 0, "sigtrap_count"); /* Configure the bpf program to allow the sample. */ skel->bss->ip = 0; test_function(); ASSERT_EQ(sigio_count, 1, "sigio_count"); ASSERT_EQ(sigtrap_count, 1, "sigtrap_count"); /* Test that the sample above is the only one allowed (by perf, not * by bpf) */ test_function(); ASSERT_EQ(sigio_count, 1, "sigio_count"); ASSERT_EQ(sigtrap_count, 1, "sigtrap_count"); cleanup: bpf_link__destroy(prog_link); if (perf_fd >= 0) close(perf_fd); test_perf_skip__destroy(skel); if (previous_sigio != SIG_ERR) signal(SIGIO, previous_sigio); sigaction(SIGTRAP, &previous_sigtrap, NULL); }
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