perf dlfilter: Add resolve_address() to perf_dlfilter_fns

Add a function, for use by dlfilters, to resolve addresses from branch
stacks or callchains.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-7-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-dlfilter.txt

@@ -123,7 +123,8 @@ struct perf_dlfilter_fns {
 	const struct perf_dlfilter_al *(*resolve_ip)(void *ctx);
 	const struct perf_dlfilter_al *(*resolve_addr)(void *ctx);
 	char **(*args)(void *ctx, int *dlargc);
-	void *(*reserved[125])(void *);
+	__s32 (*resolve_address)(void *ctx, __u64 address, struct perf_dlfilter_al *al);
+	void *(*reserved[124])(void *);
 };
 ----
 
@@ -133,6 +134,9 @@ struct perf_dlfilter_fns {
 
 'args' returns arguments from --dlarg options.
 
+'resolve_address' provides information about 'address'. al->size must be set
+before calling. Returns 0 on success, -1 otherwise.
+
 The perf_dlfilter_al structure
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

tools/perf/util/dlfilter.c

@@ -149,10 +149,39 @@ static char **dlfilter__args(void *ctx, int *dlargc)
 	return d->dlargv;
 }
 
+static __s32 dlfilter__resolve_address(void *ctx, __u64 address, struct perf_dlfilter_al *d_al_p)
+{
+	struct dlfilter *d = (struct dlfilter *)ctx;
+	struct perf_dlfilter_al d_al;
+	struct addr_location al;
+	struct thread *thread;
+	__u32 sz;
+
+	if (!d->ctx_valid || !d_al_p)
+		return -1;
+
+	thread = get_thread(d);
+	if (!thread)
+		return -1;
+
+	thread__find_symbol_fb(thread, d->sample->cpumode, address, &al);
+
+	al_to_d_al(&al, &d_al);
+
+	d_al.is_kernel_ip = machine__kernel_ip(d->machine, address);
+
+	sz = d_al_p->size;
+	memcpy(d_al_p, &d_al, min((size_t)sz, sizeof(d_al)));
+	d_al_p->size = sz;
+
+	return 0;
+}
+
 static const struct perf_dlfilter_fns perf_dlfilter_fns = {
 	.resolve_ip      = dlfilter__resolve_ip,
 	.resolve_addr    = dlfilter__resolve_addr,
 	.args            = dlfilter__args,
+	.resolve_address = dlfilter__resolve_address,
 };
 
 static char *find_dlfilter(const char *file)

tools/perf/util/perf_dlfilter.h

@@ -92,8 +92,13 @@ struct perf_dlfilter_fns {
 	const struct perf_dlfilter_al *(*resolve_addr)(void *ctx);
 	/* Return arguments from --dlarg option */
 	char **(*args)(void *ctx, int *dlargc);
+	/*
+	 * Return information about address (al->size must be set before
+	 * calling). Returns 0 on success, -1 otherwise.
+	 */
+	__s32 (*resolve_address)(void *ctx, __u64 address, struct perf_dlfilter_al *al);
 	/* Reserved */
-	void *(*reserved[125])(void *);
+	void *(*reserved[124])(void *);
 };
 
 /*