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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
dc513fd532
The bpf events are created by the same macro magic as tracefs trace events are. But to hook into bpf, it has its own code. It duplicates many of the same macros as the tracefs macros and this is an issue because it misses bug fixes as well as any new enhancements that come with the other trace macros. As the trace macros have been put into their own staging files, have bpf take advantage of this and use the tracefs stage 6 macros that the "fast ssign" portion of the trace event macro uses. Link: https://lkml.kernel.org/r/20230124202515.873075730@goodmis.org Link: https://lore.kernel.org/lkml/1671181385-5719-1-git-send-email-quic_linyyuan@quicinc.com/ Cc: bpf@vger.kernel.org Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Reported-by: Linyu Yuan <quic_linyyuan@quicinc.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
124 lines
4.3 KiB
C
124 lines
4.3 KiB
C
/* 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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#include "stages/stage6_event_callback.h"
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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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#define __CHECK_WRITABLE_BUF_SIZE(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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#undef DEFINE_EVENT_WRITABLE
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#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \
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__CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
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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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#undef DECLARE_TRACE_WRITABLE
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#define DECLARE_TRACE_WRITABLE(call, proto, args, size) \
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__CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
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__BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
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__DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size)
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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#undef DECLARE_TRACE_WRITABLE
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#undef DEFINE_EVENT_WRITABLE
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#undef __CHECK_WRITABLE_BUF_SIZE
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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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