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iommu/arm-smmu: Warn once when the perfetcher errata patch fails to apply

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Default reset value of secure banked register SMMU_sACR.cache_lock is 1.
If it is not been set to 0 by secure software(eg: atf), the non-secure
linux cannot clear ARM_MMU500_ACTLR_CPRE bit. In this situation,
the prefetcher errata is not applied successfully, warn once.

Signed-off-by: Chen Lin <chen45464546@163.com>
Link: https://lore.kernel.org/r/20221103222121.3051-1-chen45464546@163.com
[will: Tweaked wording of diagnostic]
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Chen Lin 2022-11-04 06:21:21 +08:00 committed by Will Deacon
parent 9abf2313ad
commit f87f6e5b45
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
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@ -136,6 +136,9 @@ int arm_mmu500_reset(struct arm_smmu_device *smmu)
reg = arm_smmu_cb_read(smmu, i, ARM_SMMU_CB_ACTLR);
reg &= ~ARM_MMU500_ACTLR_CPRE;
arm_smmu_cb_write(smmu, i, ARM_SMMU_CB_ACTLR, reg);
reg = arm_smmu_cb_read(smmu, i, ARM_SMMU_CB_ACTLR);
if (reg & ARM_MMU500_ACTLR_CPRE)
dev_warn_once(smmu->dev, "Failed to disable prefetcher [errata #841119 and #826419], check ACR.CACHE_LOCK\n");
}
return 0;