trace: implement debug dump

[dpdk.git] / lib / librte_eal / common / eal_common_trace_ctf.c

diff --git a/lib/librte_eal/common/eal_common_trace_ctf.c b/lib/librte_eal/common/eal_common_trace_ctf.c
index c4f00bf..302e2bb 100644 (file)
--- a/lib/librte_eal/common/eal_common_trace_ctf.c
+++ b/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;
+}