From: Rob Clark robdclark@chromium.org
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.
Signed-off-by: Rob Clark robdclark@chromium.org --- drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 6 ++++++ drivers/iommu/arm/arm-smmu/arm-smmu.c | 3 +++ drivers/iommu/arm/arm-smmu/arm-smmu.h | 3 +++ 3 files changed, 12 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c index 5640d9960610..2aa6249050ff 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -127,6 +127,12 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)) pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1;
+ /* + * On the GPU device we want to process subsequent transactions after a + * fault to keep the GPU from hanging + */ + smmu_domain->cfg.sctlr_set |= ARM_SMMU_SCTLR_HUPCF; + /* * Initialize private interface with GPU: */ diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c index e63a480d7f71..bbec5793faf8 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c @@ -617,6 +617,9 @@ 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;
+ reg |= cfg->sctlr_set; + reg &= ~cfg->sctlr_clr; + arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg); }
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h index cd75a33967bb..2df3a70a8a41 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu.h +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h @@ -144,6 +144,7 @@ enum arm_smmu_cbar_type { #define ARM_SMMU_CB_SCTLR 0x0 #define ARM_SMMU_SCTLR_S1_ASIDPNE BIT(12) #define ARM_SMMU_SCTLR_CFCFG BIT(7) +#define ARM_SMMU_SCTLR_HUPCF BIT(8) #define ARM_SMMU_SCTLR_CFIE BIT(6) #define ARM_SMMU_SCTLR_CFRE BIT(5) #define ARM_SMMU_SCTLR_E BIT(4) @@ -341,6 +342,8 @@ struct arm_smmu_cfg { u16 asid; u16 vmid; }; + u32 sctlr_set; /* extra bits to set in SCTLR */ + u32 sctlr_clr; /* bits to mask in SCTLR */ enum arm_smmu_cbar_type cbar; enum arm_smmu_context_fmt fmt; };