From: Ashish Mhetre <amhetre@nvidia.com>
To: <thierry.reding@gmail.com>, <vdumpa@nvidia.com>,
<will@kernel.org>, <robin.murphy@arm.com>, <joro@8bytes.org>
Cc: <linux-tegra@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>,
Ashish Mhetre <amhetre@nvidia.com>
Subject: [PATCH V2] iommu: arm-smmu: Fix Tegra workaround for PAGE_SIZE mappings
Date: Wed, 24 Jul 2024 17:31:32 +0000 [thread overview]
Message-ID: <20240724173132.219978-1-amhetre@nvidia.com> (raw)
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
next reply other threads:[~2024-07-24 17:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-24 17:31 Ashish Mhetre [this message]
2024-07-25 12:42 ` [PATCH V2] iommu: arm-smmu: Fix Tegra workaround for PAGE_SIZE mappings Will Deacon
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