trace: implement debug dump

Implement rte_trace_metadata_dump() and rte_trace_dump()
functions. Former one used to dump the CTF metadata file and
the latter one to dump all the registered events and its status.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Acked-by: David Marchand <david.marchand@redhat.com>

lib/librte_eal/common/eal_common_trace.c

@@ -232,6 +232,63 @@ rte_trace_point_lookup(const char *name)
 	return NULL;
 }
 
+static void
+trace_point_dump(FILE *f, struct trace_point *tp)
+{
+	rte_trace_point_t *handle = tp->handle;
+
+	fprintf(f, "\tid %d, %s, size is %d, %s\n",
+		trace_id_get(handle), tp->name,
+		(uint16_t)(*handle & __RTE_TRACE_FIELD_SIZE_MASK),
+		rte_trace_point_is_enabled(handle) ? "enabled" : "disabled");
+}
+
+static void
+trace_lcore_mem_dump(FILE *f)
+{
+	struct trace *trace = trace_obj_get();
+	struct __rte_trace_header *header;
+	uint32_t count;
+
+	if (trace->nb_trace_mem_list == 0)
+		return;
+
+	rte_spinlock_lock(&trace->lock);
+	fprintf(f, "nb_trace_mem_list = %d\n", trace->nb_trace_mem_list);
+	fprintf(f, "\nTrace mem info\n--------------\n");
+	for (count = 0; count < trace->nb_trace_mem_list; count++) {
+		header = trace->lcore_meta[count].mem;
+		fprintf(f, "\tid %d, mem=%p, area=%s, lcore_id=%d, name=%s\n",
+		count, header,
+		trace_area_to_string(trace->lcore_meta[count].area),
+		header->stream_header.lcore_id,
+		header->stream_header.thread_name);
+	}
+	rte_spinlock_unlock(&trace->lock);
+}
+
+void
+rte_trace_dump(FILE *f)
+{
+	struct trace_point_head *tp_list = trace_list_head_get();
+	struct trace *trace = trace_obj_get();
+	struct trace_point *tp;
+
+	fprintf(f, "\nGlobal info\n-----------\n");
+	fprintf(f, "status = %s\n",
+		rte_trace_is_enabled() ? "enabled" : "disabled");
+	fprintf(f, "mode = %s\n",
+		trace_mode_to_string(rte_trace_mode_get()));
+	fprintf(f, "dir = %s\n", trace->dir);
+	fprintf(f, "buffer len = %d\n", trace->buff_len);
+	fprintf(f, "number of trace points = %d\n", trace->nb_trace_points);
+
+	trace_lcore_mem_dump(f);
+	fprintf(f, "\nTrace point info\n----------------\n");
+	STAILQ_FOREACH(tp, tp_list, next)
+		trace_point_dump(f, tp);
+}
+
 void
 __rte_trace_mem_per_thread_alloc(void)
 {

lib/librte_eal/common/eal_common_trace_ctf.c

@@ -419,3 +419,70 @@ trace_metadata_destroy(void)
 	}
 }
 
+static void
+meta_fix_freq(struct trace *trace, char *meta)
+{
+	char *str;
+	int rc;
+
+	str = RTE_PTR_ADD(meta, trace->ctf_meta_offset_freq);
+	rc = sprintf(str, "%20"PRIu64"", rte_get_timer_hz());
+	str[rc] = ';';
+}
+
+static void
+meta_fix_freq_offset(struct trace *trace, char *meta)
+{
+	uint64_t uptime_tickes_floor, uptime_ticks, freq, uptime_sec;
+	uint64_t offset, offset_s;
+	char *str;
+	int rc;
+
+	uptime_ticks = trace->uptime_ticks &
+			((1ULL << __RTE_TRACE_EVENT_HEADER_ID_SHIFT) - 1);
+	freq = rte_get_tsc_hz();
+	uptime_tickes_floor = RTE_ALIGN_MUL_FLOOR(uptime_ticks, freq);
+
+	uptime_sec = uptime_tickes_floor / freq;
+	offset_s = trace->epoch_sec - uptime_sec;
+
+	offset = uptime_ticks - uptime_tickes_floor;
+	offset += trace->epoch_nsec * (freq / NSEC_PER_SEC);
+
+	str = RTE_PTR_ADD(meta, trace->ctf_meta_offset_freq_off_s);
+	rc = sprintf(str, "%20"PRIu64"", offset_s);
+	str[rc] = ';';
+	str = RTE_PTR_ADD(meta, trace->ctf_meta_offset_freq_off);
+	rc = sprintf(str, "%20"PRIu64"", offset);
+	str[rc] = ';';
+}
+
+static void
+meta_fixup(struct trace *trace, char *meta)
+{
+	meta_fix_freq(trace, meta);
+	meta_fix_freq_offset(trace, meta);
+}
+
+int
+rte_trace_metadata_dump(FILE *f)
+{
+	struct trace *trace = trace_obj_get();
+	char *ctf_meta = trace->ctf_meta;
+	int rc;
+
+	if (!rte_trace_is_enabled())
+		return 0;
+
+	if (ctf_meta == NULL)
+		return -EINVAL;
+
+	if (!__atomic_load_n(&trace->ctf_fixup_done, __ATOMIC_SEQ_CST) &&
+				rte_get_timer_hz()) {
+		meta_fixup(trace, ctf_meta);
+		__atomic_store_n(&trace->ctf_fixup_done, 1, __ATOMIC_SEQ_CST);
+	}
+
+	rc = fprintf(f, "%s", ctf_meta);
+	return rc < 0 ? rc : 0;
+}

lib/librte_eal/rte_eal_version.map

@@ -343,7 +343,9 @@ EXPERIMENTAL {
 	per_lcore_trace_point_sz;
 	rte_log_can_log;
 	rte_thread_getname;
+	rte_trace_dump;
 	rte_trace_is_enabled;
+	rte_trace_metadata_dump;
 	rte_trace_mode_get;
 	rte_trace_mode_set;
 	rte_trace_pattern;