Merge branch 'x86-entry-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / tools / lib / traceevent / kbuffer-parse.c

diff --git a/tools/lib/traceevent/kbuffer-parse.c b/tools/lib/traceevent/kbuffer-parse.c
index af2a1f3b7424141483c514daf62260b3fba08cf7..b887e7437d67423aa48209ff1826f16915f67ba4 100644 (file)
--- a/tools/lib/traceevent/kbuffer-parse.c
+++ b/tools/lib/traceevent/kbuffer-parse.c
@@ -727,3 +727,52 @@ int kbuffer_start_of_data(struct kbuffer *kbuf)
 {
        return kbuf->start;
 }
+
+/**
+ * kbuffer_raw_get - get raw buffer info
+ * @kbuf:      The kbuffer
+ * @subbuf:    Start of mapped subbuffer
+ * @info:      Info descriptor to fill in
+ *
+ * For debugging. This can return internals of the ring buffer.
+ * Expects to have info->next set to what it will read.
+ * The type, length and timestamp delta will be filled in, and
+ * @info->next will be updated to the next element.
+ * The @subbuf is used to know if the info is passed the end of
+ * data and NULL will be returned if it is.
+ */
+struct kbuffer_raw_info *
+kbuffer_raw_get(struct kbuffer *kbuf, void *subbuf, struct kbuffer_raw_info *info)
+{
+       unsigned long long flags;
+       unsigned long long delta;
+       unsigned int type_len;
+       unsigned int size;
+       int start;
+       int length;
+       void *ptr = info->next;
+
+       if (!kbuf || !subbuf)
+               return NULL;
+
+       if (kbuf->flags & KBUFFER_FL_LONG_8)
+               start = 16;
+       else
+               start = 12;
+
+       flags = read_long(kbuf, subbuf + 8);
+       size = (unsigned int)flags & COMMIT_MASK;
+
+       if (ptr < subbuf || ptr >= subbuf + start + size)
+               return NULL;
+
+       type_len = translate_data(kbuf, ptr, &ptr, &delta, &length);
+
+       info->next = ptr + length;
+
+       info->type = type_len;
+       info->delta = delta;
+       info->length = length;
+
+       return info;
+}