1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2014, Michael Ellerman, IBM Corp. 4 */ 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <stdbool.h> 9 10 #include "ebb.h" 11 12 13 /* 14 * Test of counting cycles while manipulating the user accessible bits in MMCR2. 15 */ 16 17 /* We use two values because the first freezes PMC1 and so we would get no EBBs */ 18 #define MMCR2_EXPECTED_1 0x4020100804020000UL /* (FC1P|FC2P|FC3P|FC4P|FC5P|FC6P) */ 19 #define MMCR2_EXPECTED_2 0x0020100804020000UL /* ( FC2P|FC3P|FC4P|FC5P|FC6P) */ 20 21 22 int cycles_with_mmcr2(void) 23 { 24 struct event event; 25 uint64_t val, expected[2], actual; 26 int i; 27 bool bad_mmcr2; 28 29 SKIP_IF(!ebb_is_supported()); 30 31 event_init_named(&event, 0x1001e, "cycles"); 32 event_leader_ebb_init(&event); 33 34 event.attr.exclude_kernel = 1; 35 event.attr.exclude_hv = 1; 36 event.attr.exclude_idle = 1; 37 38 FAIL_IF(event_open(&event)); 39 40 ebb_enable_pmc_counting(1); 41 setup_ebb_handler(standard_ebb_callee); 42 ebb_global_enable(); 43 44 FAIL_IF(ebb_event_enable(&event)); 45 46 mtspr(SPRN_PMC1, pmc_sample_period(sample_period)); 47 48 /* XXX Set of MMCR2 must be after enable */ 49 expected[0] = MMCR2_EXPECTED_1; 50 expected[1] = MMCR2_EXPECTED_2; 51 i = 0; 52 bad_mmcr2 = false; 53 actual = 0; 54 55 /* Make sure we loop until we take at least one EBB */ 56 while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) || 57 ebb_state.stats.ebb_count < 1) 58 { 59 mtspr(SPRN_MMCR2, expected[i % 2]); 60 61 FAIL_IF(core_busy_loop()); 62 63 val = mfspr(SPRN_MMCR2); 64 if (val != expected[i % 2]) { 65 bad_mmcr2 = true; 66 actual = val; 67 } 68 69 i++; 70 } 71 72 ebb_global_disable(); 73 ebb_freeze_pmcs(); 74 75 dump_ebb_state(); 76 77 event_close(&event); 78 79 FAIL_IF(ebb_state.stats.ebb_count == 0); 80 81 if (bad_mmcr2) 82 printf("Bad MMCR2 value seen is 0x%lx\n", actual); 83 84 FAIL_IF(bad_mmcr2); 85 86 return 0; 87 } 88 89 int main(void) 90 { 91 return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2"); 92 } 93