Commit f645744c authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarAdrian 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.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 0beb2183

tools/perf/Documentation/perf-dlfilter.txt

+5 −1
Original line number Diff line number Diff line
@@ -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

+29 −0
Original line number Diff line number Diff line
@@ -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

+6 −1
Original line number Diff line number Diff line
@@ -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 *);

};



/*