oprofile: modify op_cpu_buffer_read_entry()

This implements the support of samples with attached data.

Signed-off-by: Robert Richter <robert.richter@amd.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 934ff159e70e..400f7fcffdbe 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -182,20 +182,28 @@ int op_cpu_buffer_write_commit(struct op_entry *entry)
                                          entry->irq_flags);
 }
 
-struct op_sample *op_cpu_buffer_read_entry(int cpu)
+struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu)
 {
         struct ring_buffer_event *e;
         e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
         if (e)
-                return ring_buffer_event_data(e);
+                goto event;
         if (ring_buffer_swap_cpu(op_ring_buffer_read,
                                  op_ring_buffer_write,
                                  cpu))
                 return NULL;
         e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
         if (e)
-                return ring_buffer_event_data(e);
+                goto event;
         return NULL;
+
+event:
+        entry->event = e;
+        entry->sample = ring_buffer_event_data(e);
+        entry->size = (ring_buffer_event_length(e) - sizeof(struct op_sample))
+                / sizeof(entry->sample->data[0]);
+        entry->data = entry->sample->data;
+        return entry->sample;
 }
 
 unsigned long op_cpu_buffer_entries(int cpu)