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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/tools/lib/traceevent/kbuffer-parse.c
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@@ -361,6 +361,7 @@
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 		break;
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 	case KBUFFER_TYPE_TIME_EXTEND:
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+	case KBUFFER_TYPE_TIME_STAMP:
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 		extend = read_4(kbuf, data);
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 		data += 4;
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 		extend <<= TS_SHIFT;
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@@ -369,10 +370,6 @@
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 		*length = 0;
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 		break;
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-	case KBUFFER_TYPE_TIME_STAMP:
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-		data += 12;
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-		*length = 0;
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-		break;
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 	case 0:
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 		*length = read_4(kbuf, data) - 4;
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 		*length = (*length + 3) & ~3;
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@@ -397,7 +394,11 @@
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 	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
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396
 
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-	kbuf->timestamp += delta;
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+	if (type_len == KBUFFER_TYPE_TIME_STAMP)
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+		kbuf->timestamp = delta;
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+	else
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+		kbuf->timestamp += delta;
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+
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 	kbuf->index = calc_index(kbuf, ptr);
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 	kbuf->next = kbuf->index + length;
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@@ -438,7 +439,7 @@
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 	case KBUFFER_TYPE_TIME_EXTEND:
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 	case KBUFFER_TYPE_TIME_STAMP:
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 		return NULL;
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-	};
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+	}
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 	*size = length;
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@@ -454,7 +455,9 @@
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 		if (kbuf->next >= kbuf->size)
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 			return -1;
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 		type = update_pointers(kbuf);
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-	} while (type == KBUFFER_TYPE_TIME_EXTEND || type == KBUFFER_TYPE_PADDING);
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+	} while (type == KBUFFER_TYPE_TIME_EXTEND ||
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+		 type == KBUFFER_TYPE_TIME_STAMP ||
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+		 type == KBUFFER_TYPE_PADDING);
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461
 
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 	return 0;
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 }
..
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@@ -545,6 +548,34 @@
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548
 
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 	return 0;
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 }
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+
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+/**
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+ * kbuffer_subbuf_timestamp - read the timestamp from a sub buffer
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+ * @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.
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+ */
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+unsigned long long kbuffer_subbuf_timestamp(struct kbuffer *kbuf, void *subbuf)
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+{
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+	return kbuf->read_8(subbuf);
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+}
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+
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+/**
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+ * kbuffer_ptr_delta - read the delta field from a record
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+ * @kbuf:      The kbuffer to load
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+ * @ptr:       The record in the buffe.
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+ *
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+ * Return the timestamp delta from a record
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+ */
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+unsigned int kbuffer_ptr_delta(struct kbuffer *kbuf, void *ptr)
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+{
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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);
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+}
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+
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579
 
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 /**
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  * kbuffer_read_event - read the next event in the kbuffer subbuffer
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@@ -727,3 +758,52 @@
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 {
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 	return kbuf->start;
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 }
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+
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+/**
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+ * kbuffer_raw_get - get raw buffer info
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+ * @kbuf:	The kbuffer
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+ * @subbuf:	Start of mapped subbuffer
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+ * @info:	Info descriptor to fill in
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+ *
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+ * For debugging. This can return internals of the ring buffer.
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+ * Expects to have info->next set to what it will read.
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+ * The type, length and timestamp delta will be filled in, and
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+ * @info->next will be updated to the next element.
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+ * The @subbuf is used to know if the info is passed the end of
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+ * data and NULL will be returned if it is.
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+ */
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+struct kbuffer_raw_info *
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+kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf, struct kbuffer_raw_info *info)
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+{
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+	unsigned long long flags;
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+	unsigned long long delta;
780
+	unsigned int type_len;
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+	unsigned int size;
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+	int start;
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+	int length;
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+	void *ptr = info->next;
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+
786
+	if (!kbuf || !subbuf)
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+		return NULL;
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+
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+	if (kbuf->flags & KBUFFER_FL_LONG_8)
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+		start = 16;
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+	else
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+		start = 12;
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+
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+	flags = read_long(kbuf, subbuf + 8);
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+	size = (unsigned int)flags & COMMIT_MASK;
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+
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+	if (ptr < subbuf || ptr >= subbuf + start + size)
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+		return NULL;
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+
800
+	type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
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+
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+	info->next = ptr + length;
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+
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+	info->type = type_len;
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+	info->delta = delta;
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+	info->length = length;
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+
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+	return info;
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+}