1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2022, Athira Rajeev, 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 /*
16  * A perf sampling test for mmcr0
17  * field: cc56run.
18  */
mmcr0_cc56run(void)19 static int mmcr0_cc56run(void)
20 {
21 	struct event event;
22 	u64 *intr_regs;
23 
24 	/* Check for platform support for the test */
25 	SKIP_IF(check_pvr_for_sampling_tests());
26 	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
27 
28 	 /* Init the event for the sampling test */
29 	event_init_sampling(&event, 0x500fa);
30 	event.attr.sample_regs_intr = platform_extended_mask;
31 	FAIL_IF(event_open(&event));
32 	event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
33 
34 	FAIL_IF(event_enable(&event));
35 
36 	/* workload to make the event overflow */
37 	thirty_two_instruction_loop(10000);
38 
39 	FAIL_IF(event_disable(&event));
40 
41 	/* Check for sample count */
42 	FAIL_IF(!collect_samples(event.mmap_buffer));
43 
44 	intr_regs = get_intr_regs(&event, event.mmap_buffer);
45 
46 	/* Check for intr_regs */
47 	FAIL_IF(!intr_regs);
48 
49 	/* Verify that cc56run bit is set in MMCR0 */
50 	FAIL_IF(!get_mmcr0_cc56run(get_reg_value(intr_regs, "MMCR0"), 5));
51 
52 	event_close(&event);
53 	return 0;
54 }
55 
main(void)56 int main(void)
57 {
58 	return test_harness(mmcr0_cc56run, "mmcr0_cc56run");
59 }
60