perf intel-pt: Fix decoding when there are address filters

Due to errata SKL014 "Intel PT TIP.PGD May Not Have Target IP Payload",
the Intel PT decoder needs to match address filters against TIP.PGD
packets. Parse the address filters and implement the decoder's
'pgd_ip()' callback to match the IP against the filter regions.

Signed-off-by: Adrian Hunter <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Masami Hiramatsu <[e-mail]>
Cc: Mathieu Poirier <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/intel-pt.c

···
 	unsigned long num_events;
 
 	char *filter;
+	struct addr_filters filts;
 };
 
 enum switch_state {
···
 	return 0;
 }
 
+static bool intel_pt_match_pgd_ip(struct intel_pt *pt, uint64_t ip,
+				  uint64_t offset, const char *filename)
+{
+	struct addr_filter *filt;
+	bool have_filter   = false;
+	bool hit_tracestop = false;
+	bool hit_filter    = false;
+
+	list_for_each_entry(filt, &pt->filts.head, list) {
+		if (filt->start)
+			have_filter = true;
+
+		if ((filename && !filt->filename) ||
+		    (!filename && filt->filename) ||
+		    (filename && strcmp(filename, filt->filename)))
+			continue;
+
+		if (!(offset >= filt->addr && offset < filt->addr + filt->size))
+			continue;
+
+		intel_pt_log("TIP.PGD ip %#"PRIx64" offset %#"PRIx64" in %s hit filter: %s offset %#"PRIx64" size %#"PRIx64"\n",
+			     ip, offset, filename ? filename : "[kernel]",
+			     filt->start ? "filter" : "stop",
+			     filt->addr, filt->size);
+
+		if (filt->start)
+			hit_filter = true;
+		else
+			hit_tracestop = true;
+	}
+
+	if (!hit_tracestop && !hit_filter)
+		intel_pt_log("TIP.PGD ip %#"PRIx64" offset %#"PRIx64" in %s is not in a filter region\n",
+			     ip, offset, filename ? filename : "[kernel]");
+
+	return hit_tracestop || (have_filter && !hit_filter);
+}
+
+static int __intel_pt_pgd_ip(uint64_t ip, void *data)
+{
+	struct intel_pt_queue *ptq = data;
+	struct thread *thread;
+	struct addr_location al;
+	u8 cpumode;
+	u64 offset;
+
+	if (ip >= ptq->pt->kernel_start)
+		return intel_pt_match_pgd_ip(ptq->pt, ip, ip, NULL);
+
+	cpumode = PERF_RECORD_MISC_USER;
+
+	thread = ptq->thread;
+	if (!thread)
+		return -EINVAL;
+
+	thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al);
+	if (!al.map || !al.map->dso)
+		return -EINVAL;
+
+	offset = al.map->map_ip(al.map, ip);
+
+	return intel_pt_match_pgd_ip(ptq->pt, ip, offset,
+				     al.map->dso->long_name);
+}
+
+static bool intel_pt_pgd_ip(uint64_t ip, void *data)
+{
+	return __intel_pt_pgd_ip(ip, data) > 0;
+}
+
 static bool intel_pt_get_config(struct intel_pt *pt,
 				struct perf_event_attr *attr, u64 *config)
 {
···
 	params.mtc_period = intel_pt_mtc_period(pt);
 	params.tsc_ctc_ratio_n = pt->tsc_ctc_ratio_n;
 	params.tsc_ctc_ratio_d = pt->tsc_ctc_ratio_d;
+
+	if (pt->filts.cnt > 0)
+		params.pgd_ip = intel_pt_pgd_ip;
 
 	if (pt->synth_opts.instructions) {
 		if (pt->synth_opts.period) {
···
 	intel_pt_free_events(session);
 	session->auxtrace = NULL;
 	thread__put(pt->unknown_thread);
+	addr_filters__exit(&pt->filts);
 	zfree(&pt->filter);
 	free(pt);
 }
···
 	if (!pt)
 		return -ENOMEM;
 
+	addr_filters__init(&pt->filts);
+
 	perf_config(intel_pt_perf_config, pt);
 
 	err = auxtrace_queues__init(&pt->queues);
···
 				err = -EINVAL;
 				goto err_free_queues;
 			}
+			err = addr_filters__parse_bare_filter(&pt->filts,
+							      filter);
+			if (err)
+				goto err_free_queues;
 		}
 		intel_pt_print_info_str("Filter string", pt->filter);
 	}
···
 	auxtrace_queues__free(&pt->queues);
 	session->auxtrace = NULL;
 err_free:
+	addr_filters__exit(&pt->filts);
 	zfree(&pt->filter);
 	free(pt);
 	return err;