1*84cc4e66SKajol Jain // SPDX-License-Identifier: GPL-2.0-only
2*84cc4e66SKajol Jain /*
3*84cc4e66SKajol Jain  * Copyright 2022, Kajol Jain, IBM Corp.
4*84cc4e66SKajol Jain  */
5*84cc4e66SKajol Jain 
6*84cc4e66SKajol Jain #include <stdio.h>
7*84cc4e66SKajol Jain #include <stdlib.h>
8*84cc4e66SKajol Jain 
9*84cc4e66SKajol Jain #include "../event.h"
10*84cc4e66SKajol Jain #include "misc.h"
11*84cc4e66SKajol Jain #include "utils.h"
12*84cc4e66SKajol Jain 
13*84cc4e66SKajol Jain extern void thirty_two_instruction_loop(int loops);
14*84cc4e66SKajol Jain 
15*84cc4e66SKajol Jain /* Instructions */
16*84cc4e66SKajol Jain #define EventCode 0x500fa
17*84cc4e66SKajol Jain 
18*84cc4e66SKajol Jain /*
19*84cc4e66SKajol Jain  * A perf sampling test for mmcra
20*84cc4e66SKajol Jain  * field: bhrb_disable.
21*84cc4e66SKajol Jain  */
mmcra_bhrb_disable_test(void)22*84cc4e66SKajol Jain static int mmcra_bhrb_disable_test(void)
23*84cc4e66SKajol Jain {
24*84cc4e66SKajol Jain 	struct event event;
25*84cc4e66SKajol Jain 	u64 *intr_regs;
26*84cc4e66SKajol Jain 
27*84cc4e66SKajol Jain 	/*
28*84cc4e66SKajol Jain 	 * Check for platform support for the test.
29*84cc4e66SKajol Jain 	 * This test is only aplicable on power10
30*84cc4e66SKajol Jain 	 */
31*84cc4e66SKajol Jain 	SKIP_IF(check_pvr_for_sampling_tests());
32*84cc4e66SKajol Jain 	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
33*84cc4e66SKajol Jain 
34*84cc4e66SKajol Jain 	 /* Init the event for the sampling test */
35*84cc4e66SKajol Jain 	event_init_sampling(&event, EventCode);
36*84cc4e66SKajol Jain 	event.attr.sample_regs_intr = platform_extended_mask;
37*84cc4e66SKajol Jain 	event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK;
38*84cc4e66SKajol Jain 	event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY;
39*84cc4e66SKajol Jain 	event.attr.exclude_kernel = 1;
40*84cc4e66SKajol Jain 
41*84cc4e66SKajol Jain 	FAIL_IF(event_open(&event));
42*84cc4e66SKajol Jain 	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
43*84cc4e66SKajol Jain 
44*84cc4e66SKajol Jain 	FAIL_IF(event_enable(&event));
45*84cc4e66SKajol Jain 
46*84cc4e66SKajol Jain 	/* workload to make the event overflow */
47*84cc4e66SKajol Jain 	thirty_two_instruction_loop(10000);
48*84cc4e66SKajol Jain 
49*84cc4e66SKajol Jain 	FAIL_IF(event_disable(&event));
50*84cc4e66SKajol Jain 
51*84cc4e66SKajol Jain 	intr_regs = get_intr_regs(&event, event.mmap_buffer);
52*84cc4e66SKajol Jain 
53*84cc4e66SKajol Jain 	/* Check for intr_regs */
54*84cc4e66SKajol Jain 	FAIL_IF(!intr_regs);
55*84cc4e66SKajol Jain 
56*84cc4e66SKajol Jain 	/* Verify that bhrb_disable bit is set in MMCRA */
57*84cc4e66SKajol Jain 	FAIL_IF(get_mmcra_bhrb_disable(get_reg_value(intr_regs, "MMCRA"), 5));
58*84cc4e66SKajol Jain 
59*84cc4e66SKajol Jain 	event_close(&event);
60*84cc4e66SKajol Jain 	return 0;
61*84cc4e66SKajol Jain }
62*84cc4e66SKajol Jain 
main(void)63*84cc4e66SKajol Jain int main(void)
64*84cc4e66SKajol Jain {
65*84cc4e66SKajol Jain 	return test_harness(mmcra_bhrb_disable_test, "mmcra_bhrb_disable_test");
66*84cc4e66SKajol Jain }
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