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 * fields : pmae, pmao.
18 */
mmcr0_exceptionbits(void)19 static int mmcr0_exceptionbits(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
27 /* Init the event for the sampling test */
28 event_init_sampling(&event, 0x500fa);
29 event.attr.sample_regs_intr = platform_extended_mask;
30 FAIL_IF(event_open(&event));
31 event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
32
33 FAIL_IF(event_enable(&event));
34
35 /* workload to make the event overflow */
36 thirty_two_instruction_loop(10000);
37
38 FAIL_IF(event_disable(&event));
39
40 /* Check for sample count */
41 FAIL_IF(!collect_samples(event.mmap_buffer));
42
43 intr_regs = get_intr_regs(&event, event.mmap_buffer);
44
45 /* Check for intr_regs */
46 FAIL_IF(!intr_regs);
47
48 /* Verify that pmae is cleared and pmao is set in MMCR0 */
49 FAIL_IF(get_mmcr0_pmae(get_reg_value(intr_regs, "MMCR0"), 5));
50 FAIL_IF(!get_mmcr0_pmao(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_exceptionbits, "mmcr0_exceptionbits");
59 }
60