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| author |  Chen Lin <chen45464546@163.com>
| 2022-11-04 06:21:21 +0800 |
|---|---|---|
| committer |  Will Deacon <will@kernel.org>
| 2022-11-15 11:47:28 +0000 |
| commit | f87f6e5b4539639460ab105e597e5190c9b2500f (patch) | |
| tree | 0a124ad2b8d1c112899d569c259bb4e11d92e148 /drivers/iommu | |
| parent | Linux 6.1-rc1 (diff) | |
| download | linux-f87f6e5b4539639460ab105e597e5190c9b2500f.tar.gz linux-f87f6e5b4539639460ab105e597e5190c9b2500f.tar.bz2 linux-f87f6e5b4539639460ab105e597e5190c9b2500f.zip | |
iommu/arm-smmu: Warn once when the perfetcher errata patch fails to apply
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>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c index 658f3cc83278..9dc772f2cbb2 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c @@ -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; |