linux-kernel - [PATCH RFC v1 1/6] swiotlb: define new enumerated type

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Message-Id: <20210203233709.19819-2-dongli.zhang@oracle.com>
Date:   Wed,  3 Feb 2021 15:37:04 -0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
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Subject: [PATCH RFC v1 1/6] swiotlb: define new enumerated type

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 <joe.jin@...cle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 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