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tracing/remotes: Add REMOTE_EVENT_CUSTOM_PRINTK() helper

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The current REMOTE_EVENT() takes as a __printk argument a string format
and a list of arguments, such as RE_PRINTK("foo=%d bar=%d", foo, bar).
Add a REMOTE_EVENT_CUSTOM_PRINTK() where the __printk argument can be a
function. This intends to support the creation of a "printk" event for
the arm64 nVHE/pKVM hypervisor with a dynamic prototype and by extension
a dynamic print format.

Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Link: https://patch.msgid.link/20261001143000.3371786-4-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Vincent Donnefort 2026-10-01 15:29:59 +01:00 committed by Marc Zyngier
parent 955feee93e
commit 604aaeb395
1 changed files with 16 additions and 3 deletions
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19
include/trace/define_remote_events.h
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@ -35,17 +35,26 @@ do { \
#define RE_PRINTK(__args...) __args
#define REMOTE_EVENT(__name, __id, __struct, __printk) \
REMOTE_EVENT_FORMAT(__name, __struct); \
#define REMOTE_EVENT_PRINT_FUNC(__name, __printk) \
static void remote_event_print_##__name(void *evt, struct trace_seq *seq) \
{ \
struct remote_event_format_##__name __maybe_unused *__entry = evt; \
trace_seq_puts(seq, #__name); \
remote_printk(__printk); \
__printk; \
}
#define REMOTE_EVENT(__name, __id, __struct, __printk) \
REMOTE_EVENT_FORMAT(__name, __struct); \
REMOTE_EVENT_PRINT_FUNC(__name, remote_printk(__printk))
#define REMOTE_EVENT_CUSTOM_PRINTK(__name, __id, __struct, __printk) \
REMOTE_EVENT_FORMAT(__name, __struct); \
REMOTE_EVENT_PRINT_FUNC(__name, __printk)
#include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE)
#undef REMOTE_EVENT
#undef REMOTE_EVENT_CUSTOM_PRINTK
#undef RE_PRINTK
#undef re_field
#define re_field(__type, __field) \
@ -70,4 +79,8 @@ do { \
.print_fmt = remote_event_print_fmt_##__name, \
.print = remote_event_print_##__name, \
}
#define REMOTE_EVENT_CUSTOM_PRINTK(__name, __id, __struct, __printk) \
REMOTE_EVENT(__name, __id, RE_STRUCT(__struct), "\"Unknown\"")
#include REMOTE_EVENT_INCLUDE(REMOTE_EVENT_INCLUDE_FILE)