1*014fb4a3SKajol Jain // SPDX-License-Identifier: GPL-2.0-only
2*014fb4a3SKajol Jain /*
3*014fb4a3SKajol Jain  * Copyright 2022, Kajol Jain, IBM Corp.
4*014fb4a3SKajol Jain  */
5*014fb4a3SKajol Jain 
6*014fb4a3SKajol Jain #include <stdio.h>
7*014fb4a3SKajol Jain #include <stdlib.h>
8*014fb4a3SKajol Jain 
9*014fb4a3SKajol Jain #include "../event.h"
10*014fb4a3SKajol Jain #include "misc.h"
11*014fb4a3SKajol Jain #include "utils.h"
12*014fb4a3SKajol Jain 
13*014fb4a3SKajol Jain extern void thirty_two_instruction_loop(int loops);
14*014fb4a3SKajol Jain 
15*014fb4a3SKajol Jain /* Instructions */
16*014fb4a3SKajol Jain #define EventCode 0x500fa
17*014fb4a3SKajol Jain 
18*014fb4a3SKajol Jain /* ifm field for conditional branch mode */
19*014fb4a3SKajol Jain #define IFM_COND_BRANCH 0x3
20*014fb4a3SKajol Jain 
21*014fb4a3SKajol Jain /*
22*014fb4a3SKajol Jain  * A perf sampling test for mmcra
23*014fb4a3SKajol Jain  * field: ifm for bhrb cond call.
24*014fb4a3SKajol Jain  */
mmcra_bhrb_cond_test(void)25*014fb4a3SKajol Jain static int mmcra_bhrb_cond_test(void)
26*014fb4a3SKajol Jain {
27*014fb4a3SKajol Jain 	struct event event;
28*014fb4a3SKajol Jain 	u64 *intr_regs;
29*014fb4a3SKajol Jain 
30*014fb4a3SKajol Jain 	/*
31*014fb4a3SKajol Jain 	 * Check for platform support for the test.
32*014fb4a3SKajol Jain 	 * This test is only aplicable on power10
33*014fb4a3SKajol Jain 	 */
34*014fb4a3SKajol Jain 	SKIP_IF(check_pvr_for_sampling_tests());
35*014fb4a3SKajol Jain 	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
36*014fb4a3SKajol Jain 
37*014fb4a3SKajol Jain 	 /* Init the event for the sampling test */
38*014fb4a3SKajol Jain 	event_init_sampling(&event, EventCode);
39*014fb4a3SKajol Jain 	event.attr.sample_regs_intr = platform_extended_mask;
40*014fb4a3SKajol Jain 	event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
41*014fb4a3SKajol Jain 	event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_COND;
42*014fb4a3SKajol Jain 	event.attr.exclude_kernel = 1;
43*014fb4a3SKajol Jain 
44*014fb4a3SKajol Jain 	FAIL_IF(event_open(&event));
45*014fb4a3SKajol Jain 	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
46*014fb4a3SKajol Jain 
47*014fb4a3SKajol Jain 	FAIL_IF(event_enable(&event));
48*014fb4a3SKajol Jain 
49*014fb4a3SKajol Jain 	/* workload to make the event overflow */
50*014fb4a3SKajol Jain 	thirty_two_instruction_loop(10000);
51*014fb4a3SKajol Jain 
52*014fb4a3SKajol Jain 	FAIL_IF(event_disable(&event));
53*014fb4a3SKajol Jain 
54*014fb4a3SKajol Jain 	intr_regs = get_intr_regs(&event, event.mmap_buffer);
55*014fb4a3SKajol Jain 
56*014fb4a3SKajol Jain 	/* Check for intr_regs */
57*014fb4a3SKajol Jain 	FAIL_IF(!intr_regs);
58*014fb4a3SKajol Jain 
59*014fb4a3SKajol Jain 	/* Verify that ifm bit is set properly in MMCRA */
60*014fb4a3SKajol Jain 	FAIL_IF(get_mmcra_ifm(get_reg_value(intr_regs, "MMCRA"), 5) != IFM_COND_BRANCH);
61*014fb4a3SKajol Jain 
62*014fb4a3SKajol Jain 	event_close(&event);
63*014fb4a3SKajol Jain 	return 0;
64*014fb4a3SKajol Jain }
65*014fb4a3SKajol Jain 
main(void)66*014fb4a3SKajol Jain int main(void)
67*014fb4a3SKajol Jain {
68*014fb4a3SKajol Jain 	return test_harness(mmcra_bhrb_cond_test, "mmcra_bhrb_cond_test");
69*014fb4a3SKajol Jain }
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