[PATCH 3/8] iommu/arm-smmu: fix the values of ARM64_TCR_IRGN0_SHIFT and ARM64_TCR_ORGN0_SHIFT

On Tue, Jun 30, 2015 at 04:57:34AM +0100, leizhen wrote:

On 2015/6/30 1:25, Will Deacon wrote:

quoted

On Fri, Jun 26, 2015 at 09:32:59AM +0100, Zhen Lei wrote:

quoted

In context descriptor, the offset of IR0 is 8, the offset of OR0 is 10.

Signed-off-by: Zhen Lei <redacted>
---
 drivers/iommu/arm-smmu-v3.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 2a5f810..43120ad 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c

@@ -269,10 +269,10 @@
 #define ARM64_TCR_TG0_SHIFT		14
 #define ARM64_TCR_TG0_MASK		0x3UL
 #define CTXDESC_CD_0_TCR_IRGN0_SHIFT	8
-#define ARM64_TCR_IRGN0_SHIFT		24
+#define ARM64_TCR_IRGN0_SHIFT		8
 #define ARM64_TCR_IRGN0_MASK		0x3UL
 #define CTXDESC_CD_0_TCR_ORGN0_SHIFT	10
-#define ARM64_TCR_ORGN0_SHIFT		26
+#define ARM64_TCR_ORGN0_SHIFT		10
 #define ARM64_TCR_ORGN0_MASK		0x3UL
 #define CTXDESC_CD_0_TCR_SH0_SHIFT	12
 #define ARM64_TCR_SH0_SHIFT		12

I don't understand this patch.

The ARM64_* definitions correspond to the CPU architecture, whilst the
CTXDESC_* definitions correspond to the SMMUv3 CD description.

What problem are you seeing?

Oh, I'm sorry. My description was incorrect.

In io-pgtable-arm.c:
#define ARM_LPAE_TCR_ORGN0_SHIFT	10
#define ARM_LPAE_TCR_IRGN0_SHIFT	8

So, the description should be modified as below:
In SMMU_CBn_TCR when LPAE enabled, the offset of IRGN0 is 8, the offset of
ORGN0 is 10.

Gotcha, thanks.

Will