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 indirect_branch_loop(void); 14 15 /* Instructions */ 16 #define EventCode 0x500fa 17 18 /* ifm field for indirect branch mode */ 19 #define IFM_IND_BRANCH 0x2 20 21 /* 22 * A perf sampling test for mmcra 23 * field: ifm for bhrb ind_call. 24 */ 25 static int mmcra_bhrb_ind_call_test(void) 26 { 27 struct event event; 28 u64 *intr_regs; 29 30 /* 31 * Check for platform support for the test. 32 * This test is only aplicable on power10 33 */ 34 SKIP_IF(check_pvr_for_sampling_tests()); 35 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1)); 36 37 /* Init the event for the sampling test */ 38 event_init_sampling(&event, EventCode); 39 event.attr.sample_regs_intr = platform_extended_mask; 40 event.attr.sample_type |= PERF_SAMPLE_BRANCH_STACK; 41 event.attr.branch_sample_type = PERF_SAMPLE_BRANCH_IND_CALL; 42 event.attr.exclude_kernel = 1; 43 44 FAIL_IF(event_open(&event)); 45 event.mmap_buffer = event_sample_buf_mmap(event.fd, 1); 46 47 FAIL_IF(event_enable(&event)); 48 49 /* workload to make the event overflow */ 50 indirect_branch_loop(); 51 52 FAIL_IF(event_disable(&event)); 53 54 intr_regs = get_intr_regs(&event, event.mmap_buffer); 55 56 /* Check for intr_regs */ 57 FAIL_IF(!intr_regs); 58 59 /* Verify that ifm bit is set properly in MMCRA */ 60 FAIL_IF(get_mmcra_ifm(get_reg_value(intr_regs, "MMCRA"), 5) != IFM_IND_BRANCH); 61 62 event_close(&event); 63 return 0; 64 } 65 66 int main(void) 67 { 68 return test_harness(mmcra_bhrb_ind_call_test, "mmcra_bhrb_ind_call_test"); 69 } 70