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 Jainstatic 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 Jainint 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