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 <setjmp.h> |
9 | #include <signal.h> |
10 | |
11 | #include "ebb.h" |
12 | |
13 | |
14 | /* |
15 | * Test that closing the EBB event clears MMCR0_PMCC, preventing further access |
16 | * by userspace to the PMU hardware. |
17 | */ |
18 | |
19 | int close_clears_pmcc(void) |
20 | { |
21 | struct event event; |
22 | |
23 | SKIP_IF(!ebb_is_supported()); |
24 | |
25 | event_init_named(e: &event, config: 0x1001e, name: "cycles"); |
26 | event_leader_ebb_init(e: &event); |
27 | |
28 | FAIL_IF(event_open(e: &event)); |
29 | |
30 | ebb_enable_pmc_counting(pmc: 1); |
31 | setup_ebb_handler(standard_ebb_callee); |
32 | ebb_global_enable(); |
33 | FAIL_IF(ebb_event_enable(e: &event)); |
34 | |
35 | mtspr(SPRN_PMC1, pmc_sample_period(value: sample_period)); |
36 | |
37 | while (ebb_state.stats.ebb_count < 1) |
38 | FAIL_IF(core_busy_loop()); |
39 | |
40 | ebb_global_disable(); |
41 | event_close(e: &event); |
42 | |
43 | FAIL_IF(ebb_state.stats.ebb_count == 0); |
44 | |
45 | /* The real test is here, do we take a SIGILL when writing PMU regs now |
46 | * that we have closed the event. We expect that we will. */ |
47 | |
48 | FAIL_IF(catch_sigill(func: write_pmc1)); |
49 | |
50 | /* We should still be able to read EBB regs though */ |
51 | mfspr(SPRN_EBBHR); |
52 | mfspr(SPRN_EBBRR); |
53 | mfspr(SPRN_BESCR); |
54 | |
55 | return 0; |
56 | } |
57 | |
58 | int main(void) |
59 | { |
60 | return test_harness(close_clears_pmcc, "close_clears_pmcc"); |
61 | } |
62 |