1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Copyright 2022, Madhavan Srinivasan, IBM Corp. |
4 | */ |
5 | |
6 | #include <signal.h> |
7 | #include <stdio.h> |
8 | #include <stdlib.h> |
9 | #include <sys/types.h> |
10 | |
11 | #include "../event.h" |
12 | #include "misc.h" |
13 | #include "utils.h" |
14 | |
15 | extern void thirty_two_instruction_loop(int loops); |
16 | |
17 | static bool is_hv; |
18 | |
19 | static void sig_usr2_handler(int signum, siginfo_t *info, void *data) |
20 | { |
21 | ucontext_t *uctx = data; |
22 | |
23 | is_hv = !!(uctx->uc_mcontext.gp_regs[PT_MSR] & MSR_HV); |
24 | } |
25 | |
26 | /* |
27 | * A perf sampling test for mmcr2 |
28 | * fields : fcs, fch. |
29 | */ |
30 | static int mmcr2_fcs_fch(void) |
31 | { |
32 | struct sigaction sigact = { |
33 | .sa_sigaction = sig_usr2_handler, |
34 | .sa_flags = SA_SIGINFO |
35 | }; |
36 | struct event event; |
37 | u64 *intr_regs; |
38 | |
39 | FAIL_IF(sigaction(SIGUSR2, &sigact, NULL)); |
40 | FAIL_IF(kill(getpid(), SIGUSR2)); |
41 | |
42 | /* Check for platform support for the test */ |
43 | SKIP_IF(check_pvr_for_sampling_tests()); |
44 | |
45 | /* Init the event for the sampling test */ |
46 | event_init_sampling(e: &event, config: 0x1001e); |
47 | event.attr.sample_regs_intr = platform_extended_mask; |
48 | event.attr.exclude_kernel = 1; |
49 | FAIL_IF(event_open(e: &event)); |
50 | event.mmap_buffer = event_sample_buf_mmap(fd: event.fd, mmap_pages: 1); |
51 | |
52 | FAIL_IF(event_enable(e: &event)); |
53 | |
54 | /* workload to make the event overflow */ |
55 | thirty_two_instruction_loop(loops: 10000); |
56 | |
57 | FAIL_IF(event_disable(e: &event)); |
58 | |
59 | /* Check for sample count */ |
60 | FAIL_IF(!collect_samples(sample_buff: event.mmap_buffer)); |
61 | |
62 | intr_regs = get_intr_regs(event: &event, sample_buff: event.mmap_buffer); |
63 | |
64 | /* Check for intr_regs */ |
65 | FAIL_IF(!intr_regs); |
66 | |
67 | /* |
68 | * Verify that fcs and fch field of MMCR2 match |
69 | * with corresponding modifier fields. |
70 | */ |
71 | if (is_hv) |
72 | FAIL_IF(event.attr.exclude_kernel != |
73 | get_mmcr2_fch(mmcr2: get_reg_value(intr_regs, register_name: "MMCR2" ), pmc: 1)); |
74 | else |
75 | FAIL_IF(event.attr.exclude_kernel != |
76 | get_mmcr2_fcs(mmcr2: get_reg_value(intr_regs, register_name: "MMCR2" ), pmc: 1)); |
77 | |
78 | event_close(e: &event); |
79 | return 0; |
80 | } |
81 | |
82 | int main(void) |
83 | { |
84 | return test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch" ); |
85 | } |
86 | |