x86/oprofile: introduce oprofile_add_data64()

The IBS implemention writes 64 bit register values to the cpu buffer
by writing two 32 values using oprofile_add_data(). This patch
introduces oprofile_add_data64() to write a single 64 bit value to the
buffer.

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

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 50640cc5eef2..a7aae24f2889 100644
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -406,6 +406,21 @@ int oprofile_add_data(struct op_entry *entry, unsigned long val)
         return op_cpu_buffer_add_data(entry, val);
 }
 
+int oprofile_add_data64(struct op_entry *entry, u64 val)
+{
+        if (!entry->event)
+                return 0;
+        if (op_cpu_buffer_get_size(entry) < 2)
+                /*
+                 * the function returns 0 to indicate a too small
+                 * buffer, even if there is some space left
+                 */
+                return 0;
+        if (!op_cpu_buffer_add_data(entry, (u32)val))
+                return 0;
+        return op_cpu_buffer_add_data(entry, (u32)(val >> 32));
+}
+
 int oprofile_write_commit(struct op_entry *entry)
 {
         if (!entry->event)