* [PATCH V2] iommu: arm-smmu: Fix Tegra workaround for PAGE_SIZE mappings
@ 2024-07-24 17:31 Ashish Mhetre
2024-07-25 12:42 ` Will Deacon
0 siblings, 1 reply; 2+ messages in thread
From: Ashish Mhetre @ 2024-07-24 17:31 UTC (permalink / raw)
To: thierry.reding, vdumpa, will, robin.murphy, joro
Cc: linux-tegra, linux-arm-kernel, iommu, linux-kernel, Ashish Mhetre
PAGE_SIZE can be 16KB for Tegra which is not supported by MMU-500 on
both Tegra194 and Tegra234. Retain only valid granularities from
pgsize_bitmap which would either be 4KB or 64KB.
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
---
drivers/iommu/arm/arm-smmu/arm-smmu-nvidia.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-nvidia.c b/drivers/iommu/arm/arm-smmu/arm-smmu-nvidia.c
index 4b2994b6126d..2fce4f6d4e1b 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-nvidia.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-nvidia.c
@@ -277,7 +277,7 @@ static int nvidia_smmu_init_context(struct arm_smmu_domain *smmu_domain,
*/
if (of_device_is_compatible(np, "nvidia,tegra234-smmu") ||
of_device_is_compatible(np, "nvidia,tegra194-smmu")) {
- smmu->pgsize_bitmap = PAGE_SIZE;
+ smmu->pgsize_bitmap &= GENMASK(PAGE_SHIFT, 0);
pgtbl_cfg->pgsize_bitmap = smmu->pgsize_bitmap;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH V2] iommu: arm-smmu: Fix Tegra workaround for PAGE_SIZE mappings
2024-07-24 17:31 [PATCH V2] iommu: arm-smmu: Fix Tegra workaround for PAGE_SIZE mappings Ashish Mhetre
@ 2024-07-25 12:42 ` Will Deacon
0 siblings, 0 replies; 2+ messages in thread
From: Will Deacon @ 2024-07-25 12:42 UTC (permalink / raw)
To: thierry.reding, vdumpa, robin.murphy, joro, Ashish Mhetre
Cc: catalin.marinas, kernel-team, Will Deacon, linux-tegra,
linux-arm-kernel, iommu, linux-kernel
On Wed, 24 Jul 2024 17:31:32 +0000, Ashish Mhetre wrote:
> PAGE_SIZE can be 16KB for Tegra which is not supported by MMU-500 on
> both Tegra194 and Tegra234. Retain only valid granularities from
> pgsize_bitmap which would either be 4KB or 64KB.
>
>
Applied to iommu (next), thanks!
[1/1] iommu: arm-smmu: Fix Tegra workaround for PAGE_SIZE mappings
https://git.kernel.org/iommu/c/726d4f528dbc
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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