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 any branch mode */
19 #define IFM_ANY_BRANCH 0x0
20 
21 /*
22  * A perf sampling test for mmcra
23  * field: ifm for bhrb any call.
24  */
mmcra_bhrb_any_test(void)25 static int mmcra_bhrb_any_test(void)
26 {
27 	struct event event;
28 	u64 *intr_regs;
29 
30 	/* Check for platform support for the test */
31 	SKIP_IF(check_pvr_for_sampling_tests());
32 
33 	 /* Init the event for the sampling test */
34 	event_init_sampling(&event, EventCode);
35 	event.attr.sample_regs_intr = platform_extended_mask;
36 	event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
37 	event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY;
38 	event.attr.exclude_kernel = 1;
39 
40 	FAIL_IF(event_open(&event));
41 	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
42 
43 	FAIL_IF(event_enable(&event));
44 
45 	/* workload to make the event overflow */
46 	thirty_two_instruction_loop(10000);
47 
48 	FAIL_IF(event_disable(&event));
49 
50 	intr_regs = get_intr_regs(&event, event.mmap_buffer);
51 
52 	/* Check for intr_regs */
53 	FAIL_IF(!intr_regs);
54 
55 	/* Verify that ifm bit is set properly in MMCRA */
56 	FAIL_IF(get_mmcra_ifm(get_reg_value(intr_regs, "MMCRA"), 5) != IFM_ANY_BRANCH);
57 
58 	event_close(&event);
59 	return 0;
60 }
61 
main(void)62 int main(void)
63 {
64 	return test_harness(mmcra_bhrb_any_test, "mmcra_bhrb_any_test");
65 }
66