| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * Copyright 2022, Kajol Jain, IBM Corp. |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | |
| 9 | #include "../event.h" |
| 10 | #include "misc.h" |
| 11 | #include "utils.h" |
| 12 | |
| 13 | extern void thirty_two_instruction_loop(int loops); |
| 14 | |
| 15 | /* Instructions */ |
| 16 | #define EventCode 0x500fa |
| 17 | |
| 18 | /* |
| 19 | * A perf sampling test for mmcra |
| 20 | * field: bhrb_disable. |
| 21 | */ |
| 22 | static int mmcra_bhrb_disable_test(void) |
| 23 | { |
| 24 | struct event event; |
| 25 | u64 *intr_regs; |
| 26 | |
| 27 | /* |
| 28 | * Check for platform support for the test. |
| 29 | * This test is only aplicable on power10 |
| 30 | */ |
| 31 | SKIP_IF(check_pvr_for_sampling_tests()); |
| 32 | SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1)); |
| 33 | |
| 34 | /* Init the event for the sampling test */ |
| 35 | event_init_sampling(e: &event, EventCode); |
| 36 | event.attr.sample_regs_intr = platform_extended_mask; |
| 37 | event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; |
| 38 | event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY; |
| 39 | event.attr.exclude_kernel = 1; |
| 40 | |
| 41 | FAIL_IF(event_open(e: &event)); |
| 42 | event.mmap_buffer = event_sample_buf_mmap(fd: event.fd, mmap_pages: 1); |
| 43 | |
| 44 | FAIL_IF(event_enable(e: &event)); |
| 45 | |
| 46 | /* workload to make the event overflow */ |
| 47 | thirty_two_instruction_loop(loops: 10000); |
| 48 | |
| 49 | FAIL_IF(event_disable(e: &event)); |
| 50 | |
| 51 | intr_regs = get_intr_regs(event: &event, sample_buff: event.mmap_buffer); |
| 52 | |
| 53 | /* Check for intr_regs */ |
| 54 | FAIL_IF(!intr_regs); |
| 55 | |
| 56 | /* Verify that bhrb_disable bit is set in MMCRA */ |
| 57 | FAIL_IF(get_mmcra_bhrb_disable(mmcra: get_reg_value(intr_regs, register_name: "MMCRA"), pmc: 5)); |
| 58 | |
| 59 | event_close(e: &event); |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | int main(void) |
| 64 | { |
| 65 | return test_harness(mmcra_bhrb_disable_test, "mmcra_bhrb_disable_test"); |
| 66 | } |
| 67 |