// SPDX-License-Identifier: GPL-2.0-only /* * Copyright 2014, Michael Ellerman, IBM Corp. */ #include <stdio.h> #include <stdlib.h> #include <stdbool.h> #include "ebb.h" /* * Test of counting cycles while manipulating the user accessible bits in MMCR2. */ /* We use two values because the first freezes PMC1 and so we would get no EBBs */ #define MMCR2_EXPECTED_1 0x4020100804020000UL /* (FC1P|FC2P|FC3P|FC4P|FC5P|FC6P) */ #define MMCR2_EXPECTED_2 0x0020100804020000UL /* ( FC2P|FC3P|FC4P|FC5P|FC6P) */ int cycles_with_mmcr2(void) { struct event event; uint64_t val, expected[2], actual; int i; bool bad_mmcr2; SKIP_IF(!ebb_is_supported()); event_init_named(&event, 0x1001e, "cycles"); event_leader_ebb_init(&event); event.attr.exclude_kernel = 1; event.attr.exclude_hv = 1; event.attr.exclude_idle = 1; FAIL_IF(event_open(&event)); ebb_enable_pmc_counting(1); setup_ebb_handler(standard_ebb_callee); ebb_global_enable(); FAIL_IF(ebb_event_enable(&event)); mtspr(SPRN_PMC1, pmc_sample_period(sample_period)); /* XXX Set of MMCR2 must be after enable */ expected[0] = MMCR2_EXPECTED_1; expected[1] = MMCR2_EXPECTED_2; i = 0; bad_mmcr2 = false; actual = 0; /* Make sure we loop until we take at least one EBB */ while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) || ebb_state.stats.ebb_count < 1) { mtspr(SPRN_MMCR2, expected[i % 2]); FAIL_IF(core_busy_loop()); val = mfspr(SPRN_MMCR2); if (val != expected[i % 2]) { bad_mmcr2 = true; actual = val; } i++; } ebb_global_disable(); ebb_freeze_pmcs(); dump_ebb_state(); event_close(&event); FAIL_IF(ebb_state.stats.ebb_count == 0); if (bad_mmcr2) printf("Bad MMCR2 value seen is 0x%lx\n", actual); FAIL_IF(bad_mmcr2); return 0; } int main(void) { return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2"); }