ceb6918d1d
When vendor hooks are added to a file that previously didn't have any vendor hooks, we end up indirectly including linux/tracepoint.h. This causes some data types that used to be opaque (forward declared) to the code to become visible to the code. Modversions correctly catches this change in visibility, but we don't really care about the data types made visible when linux/tracepoint.h is included. So, hide this from modversions in the central vendor_hooks.h file instead of having to fix this on a case by case basis. Since this is a KMI frozen branch, existing vendor hook headers are left as is to avoid KMI breakage due to CRC churn. To avoid future pointless CRC churn, new vendor hook header files that include vendor_hooks.h should not include linux/tracepoint.h directly. Bug: 227513263 Bug: 226140073 Signed-off-by: Saravana Kannan <saravanak@google.com> Change-Id: Ia88e6af11dd94fe475c464eb30a6e5e1e24c938b
117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Note: we intentionally omit include file ifdef protection
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* This is due to the way trace events work. If a file includes two
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* trace event headers under one "CREATE_TRACE_POINTS" the first include
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* will override the DECLARE_RESTRICTED_HOOK and break the second include.
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*/
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#ifndef __GENKSYMS__
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#include <linux/tracepoint.h>
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#endif
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#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
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#define DECLARE_HOOK DECLARE_TRACE
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int android_rvh_probe_register(struct tracepoint *tp, void *probe, void *data);
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#ifdef TRACE_HEADER_MULTI_READ
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#define DEFINE_HOOK_FN(_name, _reg, _unreg, proto, args) \
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static const char __tpstrtab_##_name[] \
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__section("__tracepoints_strings") = #_name; \
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extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name); \
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int __traceiter_##_name(void *__data, proto); \
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struct tracepoint __tracepoint_##_name __used \
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__section("__tracepoints") = { \
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.name = __tpstrtab_##_name, \
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.key = STATIC_KEY_INIT_FALSE, \
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.static_call_key = &STATIC_CALL_KEY(tp_func_##_name), \
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.static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
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.iterator = &__traceiter_##_name, \
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.regfunc = _reg, \
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.unregfunc = _unreg, \
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.funcs = NULL }; \
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__TRACEPOINT_ENTRY(_name); \
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int __nocfi __traceiter_##_name(void *__data, proto) \
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{ \
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struct tracepoint_func *it_func_ptr; \
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void *it_func; \
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\
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it_func_ptr = (&__tracepoint_##_name)->funcs; \
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it_func = (it_func_ptr)->func; \
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do { \
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__data = (it_func_ptr)->data; \
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((void(*)(void *, proto))(it_func))(__data, args); \
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it_func = READ_ONCE((++it_func_ptr)->func); \
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} while (it_func); \
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return 0; \
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} \
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DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name);
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#undef DECLARE_RESTRICTED_HOOK
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#define DECLARE_RESTRICTED_HOOK(name, proto, args, cond) \
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DEFINE_HOOK_FN(name, NULL, NULL, PARAMS(proto), PARAMS(args))
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/* prevent additional recursion */
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#undef TRACE_HEADER_MULTI_READ
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#else /* TRACE_HEADER_MULTI_READ */
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#define DO_HOOK(name, proto, args, cond) \
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do { \
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struct tracepoint_func *it_func_ptr; \
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void *__data; \
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\
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if (!(cond)) \
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return; \
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\
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it_func_ptr = (&__tracepoint_##name)->funcs; \
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if (it_func_ptr) { \
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__data = (it_func_ptr)->data; \
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__DO_TRACE_CALL(name)(args); \
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} \
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} while (0)
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#define __DECLARE_HOOK(name, proto, args, cond, data_proto, data_args) \
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extern int __traceiter_##name(data_proto); \
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DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name); \
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extern struct tracepoint __tracepoint_##name; \
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static inline void __nocfi trace_##name(proto) \
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{ \
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if (static_key_false(&__tracepoint_##name.key)) \
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DO_HOOK(name, \
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TP_PROTO(data_proto), \
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TP_ARGS(data_args), \
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TP_CONDITION(cond)); \
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} \
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static inline bool \
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trace_##name##_enabled(void) \
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{ \
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return static_key_false(&__tracepoint_##name.key); \
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} \
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static inline int \
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register_trace_##name(void (*probe)(data_proto), void *data) \
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{ \
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return android_rvh_probe_register(&__tracepoint_##name, \
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(void *)probe, data); \
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} \
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/* vendor hooks cannot be unregistered */ \
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#undef DECLARE_RESTRICTED_HOOK
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#define DECLARE_RESTRICTED_HOOK(name, proto, args, cond) \
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__DECLARE_HOOK(name, PARAMS(proto), PARAMS(args), \
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cond, \
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PARAMS(void *__data, proto), \
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PARAMS(__data, args))
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#endif /* TRACE_HEADER_MULTI_READ */
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#else /* !CONFIG_TRACEPOINTS || !CONFIG_ANDROID_VENDOR_HOOKS */
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/* suppress trace hooks */
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#define DECLARE_HOOK DECLARE_EVENT_NOP
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#define DECLARE_RESTRICTED_HOOK(name, proto, args, cond) \
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DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
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#endif
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