# \[PATCH RFC v1 1/6\] swiotlb: define new enumerated type

- From: Dongli Zhang \<hidden\>
- Date: 2021-02-03 23:40:05 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/02/6257841
- Thread: https://ratatoskr.run/dri-devel/2021/02/6257842/t.md

```text
This is just to define new enumerated type without functional change.

The 'SWIOTLB_LO' is to index legacy 32-bit swiotlb buffer, while the
'SWIOTLB_HI' is to index the 64-bit buffer.

This is to prepare to enable 64-bit swiotlb.

Cc: Joe Jin <redacted>
Signed-off-by: Dongli Zhang <redacted>
---
 include/linux/swiotlb.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index d9c9fc9ca5d2..ca125c1b1281 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -17,6 +17,12 @@ enum swiotlb_force {
 	SWIOTLB_NO_FORCE,	/* swiotlb=noforce */
 };
 
+enum swiotlb_t {
+	SWIOTLB_LO,
+	SWIOTLB_HI,
+	SWIOTLB_MAX,
+};
+
 /*
  * Maximum allowable number of contiguous slabs to map,
  * must be a power of 2.  What is the appropriate value ?
-- 
2.17.1

```