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 | /* ifm field for conditional branch mode */ |
19 | #define IFM_COND_BRANCH 0x3 |
20 | |
21 | /* |
22 | * A perf sampling test for mmcra |
23 | * field: ifm for bhrb cond call. |
24 | */ |
25 | static int mmcra_bhrb_cond_test(void) |
26 | { |
27 | struct event event; |
28 | u64 *intr_regs; |
29 | |
30 | /* |
31 | * Check for platform support for the test. |
32 | * This test is only aplicable on power10 |
33 | */ |
34 | SKIP_IF(check_pvr_for_sampling_tests()); |
35 | SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1)); |
36 | |
37 | /* Init the event for the sampling test */ |
38 | event_init_sampling(e: &event, EventCode); |
39 | event.attr.sample_regs_intr = platform_extended_mask; |
40 | event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; |
41 | event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_COND; |
42 | event.attr.exclude_kernel = 1; |
43 | |
44 | FAIL_IF(event_open(e: &event)); |
45 | event.mmap_buffer = event_sample_buf_mmap(fd: event.fd, mmap_pages: 1); |
46 | |
47 | FAIL_IF(event_enable(e: &event)); |
48 | |
49 | /* workload to make the event overflow */ |
50 | thirty_two_instruction_loop(loops: 10000); |
51 | |
52 | FAIL_IF(event_disable(e: &event)); |
53 | |
54 | intr_regs = get_intr_regs(event: &event, sample_buff: event.mmap_buffer); |
55 | |
56 | /* Check for intr_regs */ |
57 | FAIL_IF(!intr_regs); |
58 | |
59 | /* Verify that ifm bit is set properly in MMCRA */ |
60 | FAIL_IF(get_mmcra_ifm(mmcra: get_reg_value(intr_regs, register_name: "MMCRA"), pmc: 5) != IFM_COND_BRANCH); |
61 | |
62 | event_close(e: &event); |
63 | return 0; |
64 | } |
65 | |
66 | int main(void) |
67 | { |
68 | return test_harness(mmcra_bhrb_cond_test, "mmcra_bhrb_cond_test"); |
69 | } |
70 |