Commit ec4c00fe authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf dlfilter: Add object_code() to perf_dlfilter_fns 



Add a function, for use by dlfilters, to read object code.

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/20210627131818.810-11-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6495e762

tools/perf/Documentation/perf-dlfilter.txt

+4 −1
Original line number Diff line number Diff line
@@ -127,7 +127,8 @@ struct perf_dlfilter_fns { 
	const __u8 *(*insn)(void *ctx, __u32 *length);

	const char *(*srcline)(void *ctx, __u32 *line_number);

	struct perf_event_attr *(*attr)(void *ctx);

	void *(*reserved[121])(void *);

	__s32 (*object_code)(void *ctx, __u64 ip, void *buf, __u32 len);

	void *(*reserved[120])(void *);

};

----
@@ -146,6 +147,8 @@ before calling. Returns 0 on success, -1 otherwise. 


'attr' returns perf_event_attr, refer <linux/perf_event.h>.



'object_code' reads object code and returns the number of bytes read.



The perf_dlfilter_al structure

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

tools/perf/util/dlfilter.c

+34 −0
Original line number Diff line number Diff line
@@ -245,6 +245,39 @@ static struct perf_event_attr *dlfilter__attr(void *ctx) 
	return &d->evsel->core.attr;

}



static __s32 dlfilter__object_code(void *ctx, __u64 ip, void *buf, __u32 len)

{

	struct dlfilter *d = (struct dlfilter *)ctx;

	struct addr_location *al;

	struct addr_location a;

	struct map *map;

	u64 offset;



	if (!d->ctx_valid)

		return -1;



	al = get_al(d);

	if (!al)

		return -1;



	map = al->map;



	if (map && ip >= map->start && ip < map->end &&

	    machine__kernel_ip(d->machine, ip) == machine__kernel_ip(d->machine, d->sample->ip))

		goto have_map;



	thread__find_map_fb(al->thread, d->sample->cpumode, ip, &a);

	if (!a.map)

		return -1;



	map = a.map;

have_map:

	offset = map->map_ip(map, ip);

	if (ip + len >= map->end)

		len = map->end - ip;

	return dso__data_read_offset(map->dso, d->machine, offset, buf, len);

}



static const struct perf_dlfilter_fns perf_dlfilter_fns = {

	.resolve_ip      = dlfilter__resolve_ip,

	.resolve_addr    = dlfilter__resolve_addr,
@@ -253,6 +286,7 @@ static const struct perf_dlfilter_fns perf_dlfilter_fns = { 
	.insn            = dlfilter__insn,

	.srcline         = dlfilter__srcline,

	.attr            = dlfilter__attr,

	.object_code     = dlfilter__object_code,

};



static char *find_dlfilter(const char *file)

tools/perf/util/perf_dlfilter.h

+3 −1
Original line number Diff line number Diff line
@@ -103,8 +103,10 @@ struct perf_dlfilter_fns { 
	const char *(*srcline)(void *ctx, __u32 *line_number);

	/* Return perf_event_attr, refer <linux/perf_event.h> */

	struct perf_event_attr *(*attr)(void *ctx);

	/* Read object code, return numbers of bytes read */

	__s32 (*object_code)(void *ctx, __u64 ip, void *buf, __u32 len);

	/* Reserved */

	void *(*reserved[121])(void *);

	void *(*reserved[120])(void *);

};



/*