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iommu/arm-smmu: Add a way for implementations to influence SCTLR

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For the Adreno GPU's SMMU, we want SCTLR.HUPCF set to ensure that
pending translations are not terminated on iova fault.  Otherwise
a terminated CP read could hang the GPU by returning invalid
command-stream data. Add a hook to for the implementation to modify
the sctlr value if it wishes.

Co-developed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Link: https://lore.kernel.org/r/20201109184728.2463097-3-jcrouse@codeaurora.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Rob Clark
2020-11-09 11:47:26 -07:00
committed by Will Deacon
parent 5c7469c66f
commit bffb2eaf0b
3 changed files with 19 additions and 1 deletions
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5
drivers/iommu/arm/arm-smmu/arm-smmu.c
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@@ -617,7 +617,10 @@ void arm_smmu_write_context_bank(struct arm_smmu_device *smmu, int idx)
if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
reg |= ARM_SMMU_SCTLR_E;
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg);
if (smmu->impl && smmu->impl->write_sctlr)
smmu->impl->write_sctlr(smmu, idx, reg);
else
arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg);
}
static int arm_smmu_alloc_context_bank(struct arm_smmu_domain *smmu_domain,