| 1 |
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| 2 |
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| 3 | #undef TRACE_SYSTEM_VAR
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| 4 |
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| 5 | #ifdef CONFIG_PERF_EVENTS
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| 6 |
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| 7 | #include "stages/stage6_event_callback.h"
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| 8 |
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| 9 | #undef __perf_count
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| 10 | #define __perf_count(c) (__count = (c))
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| 11 |
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| 12 | #undef __perf_task
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| 13 | #define __perf_task(t) (__task = (t))
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| 14 |
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| 15 | #undef __DECLARE_EVENT_CLASS
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| 16 | #define __DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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| 17 | static notrace void \
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| 18 | do_perf_trace_##call(void *__data, proto) \
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| 19 | { \
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| 20 | struct trace_event_call *event_call = __data; \
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| 21 | struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
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| 22 | struct trace_event_raw_##call *entry; \
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| 23 | struct pt_regs *__regs; \
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| 24 | u64 __count = 1; \
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| 25 | struct task_struct *__task = NULL; \
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| 26 | struct hlist_head *head; \
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| 27 | int __entry_size; \
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| 28 | int __data_size; \
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| 29 | int rctx; \
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| 30 | \
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| 31 | __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
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| 32 | \
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| 33 | head = this_cpu_ptr(event_call->perf_events); \
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| 34 | if (!bpf_prog_array_valid(event_call) && \
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| 35 | __builtin_constant_p(!__task) && !__task && \
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| 36 | hlist_empty(head)) \
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| 37 | return; \
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| 38 | \
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| 39 | __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
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| 40 | sizeof(u64)); \
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| 41 | __entry_size -= sizeof(u32); \
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| 42 | \
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| 43 | entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx); \
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| 44 | if (!entry) \
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| 45 | return; \
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| 46 | \
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| 47 | perf_fetch_caller_regs(__regs); \
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| 48 | \
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| 49 | tstruct \
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| 50 | \
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| 51 | { assign; } \
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| 52 | \
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| 53 | perf_trace_run_bpf_submit(entry, __entry_size, rctx, \
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| 54 | event_call, __count, __regs, \
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| 55 | head, __task); \
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| 56 | }
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| 57 |
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| 58 | |
| 59 | * Define unused __count and __task variables to use @args to pass
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| 60 | * arguments to do_perf_trace_##call. This is needed because the
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| 61 | * macros __perf_count and __perf_task introduce the side-effect to
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| 62 | * store copies into those local variables.
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| 63 |
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| 64 | #undef DECLARE_EVENT_CLASS
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| 65 | #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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| 66 | __DECLARE_EVENT_CLASS(call, PARAMS(proto), PARAMS(args), PARAMS(tstruct), \
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| 67 | PARAMS(assign), PARAMS(print)) \
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| 68 | static notrace void \
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| 69 | perf_trace_##call(void *__data, proto) \
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| 70 | { \
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| 71 | u64 __count __attribute__((unused)); \
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| 72 | struct task_struct *__task __attribute__((unused)); \
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| 73 | \
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| 74 | guard(preempt_notrace)(); \
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| 75 | do_perf_trace_##call(__data, args); \
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| 76 | }
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| 77 |
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| 78 | #undef DECLARE_EVENT_SYSCALL_CLASS
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| 79 | #define DECLARE_EVENT_SYSCALL_CLASS(call, proto, args, tstruct, assign, print) \
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| 80 | __DECLARE_EVENT_CLASS(call, PARAMS(proto), PARAMS(args), PARAMS(tstruct), \
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| 81 | PARAMS(assign), PARAMS(print)) \
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| 82 | static notrace void \
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| 83 | perf_trace_##call(void *__data, proto) \
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| 84 | { \
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| 85 | u64 __count __attribute__((unused)); \
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| 86 | struct task_struct *__task __attribute__((unused)); \
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| 87 | \
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| 88 | might_fault(); \
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| 89 | guard(preempt_notrace)(); \
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| 90 | do_perf_trace_##call(__data, args); \
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| 91 | }
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| 92 |
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| 93 | |
| 94 | * This part is compiled out, it is only here as a build time check
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| 95 | * to make sure that if the tracepoint handling changes, the
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| 96 | * perf probe will fail to compile unless it too is updated.
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| 97 |
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| 98 | #undef DEFINE_EVENT
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| 99 | #define DEFINE_EVENT(template, call, proto, args) \
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| 100 | static inline void perf_test_probe_##call(void) \
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| 101 | { \
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| 102 | check_trace_callback_type_##call(perf_trace_##template); \
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| 103 | }
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| 104 |
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| 105 |
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| 106 | #undef DEFINE_EVENT_PRINT
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| 107 | #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
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| 108 | DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
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| 109 |
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| 110 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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| 111 |
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| 112 | #undef __DECLARE_EVENT_CLASS
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| 113 |
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| 114 | #endif
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