diff options
Diffstat (limited to 'tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c')
-rw-r--r-- | tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c new file mode 100644 index 0000000000..4e242fd61b --- /dev/null +++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c @@ -0,0 +1,85 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022, Madhavan Srinivasan, IBM Corp. + */ + +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> + +#include "../event.h" +#include "misc.h" +#include "utils.h" + +extern void thirty_two_instruction_loop(int loops); + +static bool is_hv; + +static void sig_usr2_handler(int signum, siginfo_t *info, void *data) +{ + ucontext_t *uctx = data; + + is_hv = !!(uctx->uc_mcontext.gp_regs[PT_MSR] & MSR_HV); +} + +/* + * A perf sampling test for mmcr2 + * fields : fcs, fch. + */ +static int mmcr2_fcs_fch(void) +{ + struct sigaction sigact = { + .sa_sigaction = sig_usr2_handler, + .sa_flags = SA_SIGINFO + }; + struct event event; + u64 *intr_regs; + + FAIL_IF(sigaction(SIGUSR2, &sigact, NULL)); + FAIL_IF(kill(getpid(), SIGUSR2)); + + /* Check for platform support for the test */ + SKIP_IF(check_pvr_for_sampling_tests()); + + /* Init the event for the sampling test */ + event_init_sampling(&event, 0x1001e); + event.attr.sample_regs_intr = platform_extended_mask; + event.attr.exclude_kernel = 1; + FAIL_IF(event_open(&event)); + event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); + + FAIL_IF(event_enable(&event)); + + /* workload to make the event overflow */ + thirty_two_instruction_loop(10000); + + FAIL_IF(event_disable(&event)); + + /* Check for sample count */ + FAIL_IF(!collect_samples(event.mmap_buffer)); + + intr_regs = get_intr_regs(&event, event.mmap_buffer); + + /* Check for intr_regs */ + FAIL_IF(!intr_regs); + + /* + * Verify that fcs and fch field of MMCR2 match + * with corresponding modifier fields. + */ + if (is_hv) + FAIL_IF(event.attr.exclude_kernel != + get_mmcr2_fch(get_reg_value(intr_regs, "MMCR2"), 1)); + else + FAIL_IF(event.attr.exclude_kernel != + get_mmcr2_fcs(get_reg_value(intr_regs, "MMCR2"), 1)); + + event_close(&event); + return 0; +} + +int main(void) +{ + return test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch"); +} |