From: Arnaldo Carvalho de Melo acme@redhat.com
[ Upstream commit 3f41b77843b338e836f52cc2d486be689d6cb9c1 ]
This will go from a string to a number, so that filter expressions can be constructed with strings and then, before applying the tracepoint filters (or eBPF, in the future) we can map those strings to numbers.
The first one will be for 'msr' tracepoint arguments, but real quickly we will be able to reuse all strarrays for that.
Cc: Adrian Hunter adrian.hunter@intel.com Cc: Brendan Gregg brendan.d.gregg@gmail.com Cc: Jiri Olsa jolsa@kernel.org Cc: Luis Cláudio Gonçalves lclaudio@redhat.com Cc: Namhyung Kim namhyung@kernel.org Link: https://lkml.kernel.org/n/tip-wgqq48agcgr95b8dmn6fygtr@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Stable-dep-of: 03e9a5d8eb55 ("perf trace: Handle failure when trace point folder is missed") Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/builtin-trace.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 02cf39970ed0..4cb3252623f5 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -86,8 +86,12 @@ # define F_LINUX_SPECIFIC_BASE 1024 #endif
+/* + * strtoul: Go from a string to a value, i.e. for msr: MSR_FS_BASE to 0xc0000100 + */ struct syscall_arg_fmt { size_t (*scnprintf)(char *bf, size_t size, struct syscall_arg *arg); + bool (*strtoul)(char *bf, size_t size, struct syscall_arg *arg, u64 *val); unsigned long (*mask_val)(struct syscall_arg *arg, unsigned long val); void *parm; const char *name; @@ -1515,8 +1519,10 @@ syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field } else { struct syscall_arg_fmt *fmt = syscall_arg_fmt__find_by_name(field->name);
- if (fmt) + if (fmt) { arg->scnprintf = fmt->scnprintf; + arg->strtoul = fmt->strtoul; + } } }