linux-kernel - [PATCH 5.15 158/179] iommu/rockchip: Fix PAGE_DESC_HI

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Date:   Mon, 29 Nov 2021 19:19:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alex Bee <knaerzche@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Dan Johansen <strit@...jaro.org>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Joerg Roedel <jroedel@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 158/179] iommu/rockchip: Fix PAGE_DESC_HI_MASKs for RK3568

From: Alex Bee <knaerzche@...il.com>

[ Upstream commit f7ff3cff3527ff1e70cad8d2fe7c0c7b6f83120a ]

With the submission of iommu driver for RK3568 a subtle bug was
introduced: PAGE_DESC_HI_MASK1 and PAGE_DESC_HI_MASK2 have to be
the other way arround - that leads to random errors, especially when
addresses beyond 32 bit are used.

Fix it.

Fixes: c55356c534aa ("iommu: rockchip: Add support for iommu v2")
Signed-off-by: Alex Bee <knaerzche@...il.com>
Tested-by: Peter Geis <pgwipeout@...il.com>
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Tested-by: Dan Johansen <strit@...jaro.org>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
Link: https://lore.kernel.org/r/20211124021325.858139-1-knaerzche@gmail.com
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/rockchip-iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 5cb260820eda6..7f23ad61c094f 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -200,8 +200,8 @@ static inline phys_addr_t rk_dte_pt_address(u32 dte)
 #define DTE_HI_MASK2	GENMASK(7, 4)
 #define DTE_HI_SHIFT1	24 /* shift bit 8 to bit 32 */
 #define DTE_HI_SHIFT2	32 /* shift bit 4 to bit 36 */
-#define PAGE_DESC_HI_MASK1	GENMASK_ULL(39, 36)
-#define PAGE_DESC_HI_MASK2	GENMASK_ULL(35, 32)
+#define PAGE_DESC_HI_MASK1	GENMASK_ULL(35, 32)
+#define PAGE_DESC_HI_MASK2	GENMASK_ULL(39, 36)
 
 static inline phys_addr_t rk_dte_pt_address_v2(u32 dte)
 {
-- 
2.33.0