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128 lines
4.2 KiB
128 lines
4.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#undef TRACE_SYSTEM_VAR |
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#ifdef CONFIG_BPF_EVENTS |
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#undef __entry |
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#define __entry entry |
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#undef __get_dynamic_array |
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#define __get_dynamic_array(field) \ |
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((void *)__entry + (__entry->__data_loc_##field & 0xffff)) |
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#undef __get_dynamic_array_len |
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#define __get_dynamic_array_len(field) \ |
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((__entry->__data_loc_##field >> 16) & 0xffff) |
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#undef __get_str |
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#define __get_str(field) ((char *)__get_dynamic_array(field)) |
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#undef __get_bitmask |
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#define __get_bitmask(field) (char *)__get_dynamic_array(field) |
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#undef __perf_count |
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#define __perf_count(c) (c) |
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#undef __perf_task |
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#define __perf_task(t) (t) |
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/* cast any integer, pointer, or small struct to u64 */ |
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#define UINTTYPE(size) \ |
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__typeof__(__builtin_choose_expr(size == 1, (u8)1, \ |
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__builtin_choose_expr(size == 2, (u16)2, \ |
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__builtin_choose_expr(size == 4, (u32)3, \ |
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__builtin_choose_expr(size == 8, (u64)4, \ |
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(void)5))))) |
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#define __CAST_TO_U64(x) ({ \ |
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typeof(x) __src = (x); \ |
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UINTTYPE(sizeof(x)) __dst; \ |
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memcpy(&__dst, &__src, sizeof(__dst)); \ |
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(u64)__dst; }) |
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#define __CAST1(a,...) __CAST_TO_U64(a) |
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#define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__) |
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#define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__) |
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#define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__) |
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#define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__) |
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#define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__) |
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#define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__) |
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#define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__) |
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#define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__) |
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#define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__) |
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#define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__) |
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#define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__) |
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/* tracepoints with more than 12 arguments will hit build error */ |
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#define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) |
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#define __BPF_DECLARE_TRACE(call, proto, args) \ |
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static notrace void \ |
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__bpf_trace_##call(void *__data, proto) \ |
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{ \ |
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struct bpf_prog *prog = __data; \ |
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CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ |
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} |
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#undef DECLARE_EVENT_CLASS |
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#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ |
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__BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) |
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/* |
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* This part is compiled out, it is only here as a build time check |
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* to make sure that if the tracepoint handling changes, the |
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* bpf probe will fail to compile unless it too is updated. |
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*/ |
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#define __DEFINE_EVENT(template, call, proto, args, size) \ |
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static inline void bpf_test_probe_##call(void) \ |
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{ \ |
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check_trace_callback_type_##call(__bpf_trace_##template); \ |
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} \ |
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typedef void (*btf_trace_##call)(void *__data, proto); \ |
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static union { \ |
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struct bpf_raw_event_map event; \ |
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btf_trace_##call handler; \ |
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} __bpf_trace_tp_map_##call __used \ |
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__section("__bpf_raw_tp_map") = { \ |
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.event = { \ |
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.tp = &__tracepoint_##call, \ |
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.bpf_func = __bpf_trace_##template, \ |
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.num_args = COUNT_ARGS(args), \ |
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.writable_size = size, \ |
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}, \ |
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}; |
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#define FIRST(x, ...) x |
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#undef DEFINE_EVENT_WRITABLE |
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#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ |
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static inline void bpf_test_buffer_##call(void) \ |
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{ \ |
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/* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ |
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* BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ |
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* dead-code-eliminated. \ |
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*/ \ |
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FIRST(proto); \ |
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(void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ |
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} \ |
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__DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) |
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#undef DEFINE_EVENT |
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#define DEFINE_EVENT(template, call, proto, args) \ |
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__DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) |
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#undef DEFINE_EVENT_PRINT |
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#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ |
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DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) |
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#undef DECLARE_TRACE |
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#define DECLARE_TRACE(call, proto, args) \ |
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__BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ |
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__DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) |
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
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#undef DEFINE_EVENT_WRITABLE |
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#undef __DEFINE_EVENT |
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#undef FIRST |
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#endif /* CONFIG_BPF_EVENTS */
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