1*78cd598aSKajol Jain // SPDX-License-Identifier: GPL-2.0-only
2*78cd598aSKajol Jain /*
3*78cd598aSKajol Jain  * Copyright 2022, Kajol Jain, IBM Corp.
4*78cd598aSKajol Jain  */
5*78cd598aSKajol Jain 
6*78cd598aSKajol Jain #include <stdio.h>
7*78cd598aSKajol Jain #include <stdlib.h>
8*78cd598aSKajol Jain 
9*78cd598aSKajol Jain #include "../event.h"
10*78cd598aSKajol Jain #include "misc.h"
11*78cd598aSKajol Jain #include "utils.h"
12*78cd598aSKajol Jain 
13*78cd598aSKajol Jain extern void thirty_two_instruction_loop(int loops);
14*78cd598aSKajol Jain 
15*78cd598aSKajol Jain /* Instructions */
16*78cd598aSKajol Jain #define EventCode 0x500fa
17*78cd598aSKajol Jain 
18*78cd598aSKajol Jain /*
19*78cd598aSKajol Jain  * A perf sampling test for mmcra
20*78cd598aSKajol Jain  * field: bhrb_disable.
21*78cd598aSKajol Jain  */
mmcra_bhrb_disable_no_branch_test(void)22*78cd598aSKajol Jain static int mmcra_bhrb_disable_no_branch_test(void)
23*78cd598aSKajol Jain {
24*78cd598aSKajol Jain 	struct event event;
25*78cd598aSKajol Jain 	u64 *intr_regs;
26*78cd598aSKajol Jain 
27*78cd598aSKajol Jain 	/*
28*78cd598aSKajol Jain 	 * Check for platform support for the test.
29*78cd598aSKajol Jain 	 * This test is only aplicable on power10
30*78cd598aSKajol Jain 	 */
31*78cd598aSKajol Jain 	SKIP_IF(check_pvr_for_sampling_tests());
32*78cd598aSKajol Jain 	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
33*78cd598aSKajol Jain 
34*78cd598aSKajol Jain 	 /* Init the event for the sampling test */
35*78cd598aSKajol Jain 	event_init_sampling(&event, EventCode);
36*78cd598aSKajol Jain 	event.attr.sample_regs_intr = platform_extended_mask;
37*78cd598aSKajol Jain 	event.attr.exclude_kernel = 1;
38*78cd598aSKajol Jain 
39*78cd598aSKajol Jain 	FAIL_IF(event_open(&event));
40*78cd598aSKajol Jain 	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
41*78cd598aSKajol Jain 
42*78cd598aSKajol Jain 	FAIL_IF(event_enable(&event));
43*78cd598aSKajol Jain 
44*78cd598aSKajol Jain 	/* workload to make the event overflow */
45*78cd598aSKajol Jain 	thirty_two_instruction_loop(10000);
46*78cd598aSKajol Jain 
47*78cd598aSKajol Jain 	FAIL_IF(event_disable(&event));
48*78cd598aSKajol Jain 
49*78cd598aSKajol Jain 	intr_regs = get_intr_regs(&event, event.mmap_buffer);
50*78cd598aSKajol Jain 
51*78cd598aSKajol Jain 	/* Check for intr_regs */
52*78cd598aSKajol Jain 	FAIL_IF(!intr_regs);
53*78cd598aSKajol Jain 
54*78cd598aSKajol Jain 	/* Verify that bhrb_disable bit is set in MMCRA for non-branch samples */
55*78cd598aSKajol Jain 	FAIL_IF(!get_mmcra_bhrb_disable(get_reg_value(intr_regs, "MMCRA"), 5));
56*78cd598aSKajol Jain 
57*78cd598aSKajol Jain 	event_close(&event);
58*78cd598aSKajol Jain 	return 0;
59*78cd598aSKajol Jain }
60*78cd598aSKajol Jain 
main(void)61*78cd598aSKajol Jain int main(void)
62*78cd598aSKajol Jain {
63*78cd598aSKajol Jain 	return test_harness(mmcra_bhrb_disable_no_branch_test, "mmcra_bhrb_disable_no_branch_test");
64*78cd598aSKajol Jain }
65