1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2022, Kajol Jain, 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 /* Instructions */ 16 #define EventCode 0x500fa 17 18 /* 19 * A perf sampling test for mmcra 20 * field: bhrb_disable. 21 */ 22 static int mmcra_bhrb_disable_test(void) 23 { 24 struct event event; 25 u64 *intr_regs; 26 27 /* 28 * Check for platform support for the test. 29 * This test is only aplicable on power10 30 */ 31 SKIP_IF(check_pvr_for_sampling_tests()); 32 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1)); 33 34 /* Init the event for the sampling test */ 35 event_init_sampling(&event, EventCode); 36 event.attr.sample_regs_intr = platform_extended_mask; 37 event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; 38 event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_ANY; 39 event.attr.exclude_kernel = 1; 40 41 FAIL_IF(event_open(&event)); 42 event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); 43 44 FAIL_IF(event_enable(&event)); 45 46 /* workload to make the event overflow */ 47 thirty_two_instruction_loop(10000); 48 49 FAIL_IF(event_disable(&event)); 50 51 intr_regs = get_intr_regs(&event, event.mmap_buffer); 52 53 /* Check for intr_regs */ 54 FAIL_IF(!intr_regs); 55 56 /* Verify that bhrb_disable bit is set in MMCRA */ 57 FAIL_IF(get_mmcra_bhrb_disable(get_reg_value(intr_regs, "MMCRA"), 5)); 58 59 event_close(&event); 60 return 0; 61 } 62 63 int main(void) 64 { 65 return test_harness(mmcra_bhrb_disable_test, "mmcra_bhrb_disable_test"); 66 } 67