| /* |
| * Copyright 2014, Michael Ellerman, IBM Corp. |
| * Licensed under GPLv2. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <setjmp.h> |
| #include <signal.h> |
| |
| #include "ebb.h" |
| |
| |
| /* |
| * Test that closing the EBB event clears MMCR0_PMCC, preventing further access |
| * by userspace to the PMU hardware. |
| */ |
| |
| int close_clears_pmcc(void) |
| { |
| struct event event; |
| |
| event_init_named(&event, 0x1001e, "cycles"); |
| event_leader_ebb_init(&event); |
| |
| 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)); |
| |
| while (ebb_state.stats.ebb_count < 1) |
| FAIL_IF(core_busy_loop()); |
| |
| ebb_global_disable(); |
| event_close(&event); |
| |
| FAIL_IF(ebb_state.stats.ebb_count == 0); |
| |
| /* The real test is here, do we take a SIGILL when writing PMU regs now |
| * that we have closed the event. We expect that we will. */ |
| |
| FAIL_IF(catch_sigill(write_pmc1)); |
| |
| /* We should still be able to read EBB regs though */ |
| mfspr(SPRN_EBBHR); |
| mfspr(SPRN_EBBRR); |
| mfspr(SPRN_BESCR); |
| |
| return 0; |
| } |
| |
| int main(void) |
| { |
| return test_harness(close_clears_pmcc, "close_clears_pmcc"); |
| } |