| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * Copyright 2014, Michael Ellerman, IBM Corp. |
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| 4 | */ |
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| 5 | |
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| 6 | #include <signal.h> |
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| 7 | #include <stdio.h> |
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| 8 | #include <stdlib.h> |
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| 9 | #include <stdbool.h> |
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| 10 | #include <sys/types.h> |
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| 11 | #include <sys/wait.h> |
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| 12 | #include <unistd.h> |
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| 13 | |
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| 14 | #include "ebb.h" |
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| 15 | |
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| 16 | |
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| 17 | /* |
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| 18 | * Tests we can setup an EBB on our child. Nothing interesting happens, because |
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| 19 | * even though the event is enabled and running the child hasn't enabled the |
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| 20 | * actual delivery of the EBBs. |
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| 21 | */ |
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| 22 | |
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| 23 | static int victim_child(union pipe read_pipe, union pipe write_pipe) |
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| 24 | { |
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| 25 | int i; |
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| 26 | |
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| 27 | FAIL_IF(wait_for_parent(read_pipe)); |
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| 28 | FAIL_IF(notify_parent(write_pipe)); |
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| 29 | |
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| 30 | /* Parent creates EBB event */ |
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| 31 | |
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| 32 | FAIL_IF(wait_for_parent(read_pipe)); |
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| 33 | FAIL_IF(notify_parent(write_pipe)); |
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| 34 | |
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| 35 | /* Check the EBB is enabled by writing PMC1 */ |
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| 36 | write_pmc1(); |
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| 37 | |
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| 38 | /* EBB event is enabled here */ |
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| 39 | for (i = 0; i < 1000000; i++) ; |
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| 40 | |
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| 41 | return 0; |
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| 42 | } |
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| 43 | |
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| 44 | int ebb_on_child(void) |
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| 45 | { |
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| 46 | union pipe read_pipe, write_pipe; |
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| 47 | struct event event; |
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| 48 | pid_t pid; |
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| 49 | |
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| 50 | SKIP_IF(!ebb_is_supported()); |
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| 51 | |
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| 52 | FAIL_IF(pipe(read_pipe.fds) == -1); |
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| 53 | FAIL_IF(pipe(write_pipe.fds) == -1); |
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| 54 | |
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| 55 | pid = fork(); |
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| 56 | if (pid == 0) { |
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| 57 | /* NB order of pipes looks reversed */ |
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| 58 | exit(victim_child(read_pipe: write_pipe, write_pipe: read_pipe)); |
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| 59 | } |
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| 60 | |
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| 61 | FAIL_IF(sync_with_child(read_pipe, write_pipe)); |
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| 62 | |
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| 63 | /* Child is running now */ |
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| 64 | |
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| 65 | event_init_named(e: &event, config: 0x1001e, name: "cycles" ); |
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| 66 | event_leader_ebb_init(e: &event); |
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| 67 | |
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| 68 | event.attr.exclude_kernel = 1; |
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| 69 | event.attr.exclude_hv = 1; |
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| 70 | event.attr.exclude_idle = 1; |
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| 71 | |
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| 72 | FAIL_IF(event_open_with_pid(e: &event, pid)); |
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| 73 | FAIL_IF(ebb_event_enable(e: &event)); |
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| 74 | |
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| 75 | FAIL_IF(sync_with_child(read_pipe, write_pipe)); |
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| 76 | |
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| 77 | /* Child should just exit happily */ |
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| 78 | FAIL_IF(wait_for_child(child_pid: pid)); |
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| 79 | |
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| 80 | event_close(e: &event); |
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| 81 | |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |
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| 85 | int main(void) |
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| 86 | { |
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| 87 | return test_harness(ebb_on_child, "ebb_on_child" ); |
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| 88 | } |
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| 89 | |
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