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authorMasami Hiramatsu (Google) <mhiramat@kernel.org>2023-08-22 18:25:42 +0200
committerMasami Hiramatsu (Google) <mhiramat@kernel.org>2023-08-23 02:39:15 +0200
commitb1d1e90490b671444ebf66292201572c1059d323 (patch)
tree592078e0509a6d9ffa75586e1a78c1a3d8a8feff /kernel/trace/trace_btf.h
parenttracing/eprobe: Iterate trace_eprobe directly (diff)
downloadlinux-b1d1e90490b671444ebf66292201572c1059d323.tar.xz
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tracing/probes: Support BTF argument on module functions
Since the btf returned from bpf_get_btf_vmlinux() only covers functions in the vmlinux, BTF argument is not available on the functions in the modules. Use bpf_find_btf_id() instead of bpf_get_btf_vmlinux()+btf_find_name_kind() so that BTF argument can find the correct struct btf and btf_type in it. With this fix, fprobe events can use `$arg*` on module functions as below # grep nf_log_ip_packet /proc/kallsyms ffffffffa0005c00 t nf_log_ip_packet [nf_log_syslog] ffffffffa0005bf0 t __pfx_nf_log_ip_packet [nf_log_syslog] # echo 'f nf_log_ip_packet $arg*' > dynamic_events # cat dynamic_events f:fprobes/nf_log_ip_packet__entry nf_log_ip_packet net=net pf=pf hooknum=hooknum skb=skb in=in out=out loginfo=loginfo prefix=prefix To support the module's btf which is removable, the struct btf needs to be ref-counted. So this also records the btf in the traceprobe_parse_context and returns the refcount when the parse has done. Link: https://lore.kernel.org/all/169272154223.160970.3507930084247934031.stgit@devnote2/ Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_btf.h')
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