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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/tools/lib/traceevent/kbuffer-parse.c
....@@ -361,6 +361,7 @@
361361 		break;
362362 
363363 	case KBUFFER_TYPE_TIME_EXTEND:
364
+	case KBUFFER_TYPE_TIME_STAMP:
364365 		extend = read_4(kbuf, data);
365366 		data += 4;
366367 		extend <<= TS_SHIFT;
....@@ -369,10 +370,6 @@
369370 		*length = 0;
370371 		break;
371372 
372
-	case KBUFFER_TYPE_TIME_STAMP:
373
-		data += 12;
374
-		*length = 0;
375
-		break;
376373 	case 0:
377374 		*length = read_4(kbuf, data) - 4;
378375 		*length = (*length + 3) & ~3;
....@@ -397,7 +394,11 @@
397394 
398395 	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
399396 
400
-	kbuf->timestamp += delta;
397
+	if (type_len == KBUFFER_TYPE_TIME_STAMP)
398
+		kbuf->timestamp = delta;
399
+	else
400
+		kbuf->timestamp += delta;
401
+
401402 	kbuf->index = calc_index(kbuf, ptr);
402403 	kbuf->next = kbuf->index + length;
403404 
....@@ -438,7 +439,7 @@
438439 	case KBUFFER_TYPE_TIME_EXTEND:
439440 	case KBUFFER_TYPE_TIME_STAMP:
440441 		return NULL;
441
-	};
442
+	}
442443 
443444 	*size = length;
444445 
....@@ -454,7 +455,9 @@
454455 		if (kbuf->next >= kbuf->size)
455456 			return -1;
456457 		type = update_pointers(kbuf);
457
-	} while (type == KBUFFER_TYPE_TIME_EXTEND || type == KBUFFER_TYPE_PADDING);
458
+	} while (type == KBUFFER_TYPE_TIME_EXTEND ||
459
+		 type == KBUFFER_TYPE_TIME_STAMP ||
460
+		 type == KBUFFER_TYPE_PADDING);
458461 
459462 	return 0;
460463 }
....@@ -545,6 +548,34 @@
545548 
546549 	return 0;
547550 }
551
+
552
+/**
553
+ * kbuffer_subbuf_timestamp - read the timestamp from a sub buffer
554
+ * @kbuf:      The kbuffer to load
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+ * @subbuf:    The subbuffer to read from.
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+ *
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+ * Return the timestamp from a subbuffer.
558
+ */
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+unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf)
560
+{
561
+	return kbuf->read_8(subbuf);
562
+}
563
+
564
+/**
565
+ * kbuffer_ptr_delta - read the delta field from a record
566
+ * @kbuf:      The kbuffer to load
567
+ * @ptr:       The record in the buffe.
568
+ *
569
+ * Return the timestamp delta from a record
570
+ */
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+unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr)
572
+{
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+	unsigned int type_len_ts;
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+
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+	type_len_ts = read_4(kbuf, ptr);
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+	return ts4host(kbuf, type_len_ts);
577
+}
578
+
548579 
549580 /**
550581  * kbuffer_read_event - read the next event in the kbuffer subbuffer
....@@ -727,3 +758,52 @@
727758 {
728759 	return kbuf->start;
729760 }
761
+
762
+/**
763
+ * kbuffer_raw_get - get raw buffer info
764
+ * @kbuf:	The kbuffer
765
+ * @subbuf:	Start of mapped subbuffer
766
+ * @info:	Info descriptor to fill in
767
+ *
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+ * For debugging. This can return internals of the ring buffer.
769
+ * Expects to have info->next set to what it will read.
770
+ * The type, length and timestamp delta will be filled in, and
771
+ * @info->next will be updated to the next element.
772
+ * The @subbuf is used to know if the info is passed the end of
773
+ * data and NULL will be returned if it is.
774
+ */
775
+struct kbuffer_raw_info *
776
+kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf, struct kbuffer_raw_info *info)
777
+{
778
+	unsigned long long flags;
779
+	unsigned long long delta;
780
+	unsigned int type_len;
781
+	unsigned int size;
782
+	int start;
783
+	int length;
784
+	void *ptr = info->next;
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+
786
+	if (!kbuf || !subbuf)
787
+		return NULL;
788
+
789
+	if (kbuf->flags & KBUFFER_FL_LONG_8)
790
+		start = 16;
791
+	else
792
+		start = 12;
793
+
794
+	flags = read_long(kbuf, subbuf + 8);
795
+	size = (unsigned int)flags & COMMIT_MASK;
796
+
797
+	if (ptr < subbuf || ptr >= subbuf + start + size)
798
+		return NULL;
799
+
800
+	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
801
+
802
+	info->next = ptr + length;
803
+
804
+	info->type = type_len;
805
+	info->delta = delta;
806
+	info->length = length;
807
+
808
+	return info;
809
+}