| Message ID | 20200814024114.1177553-19-robdclark@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iommu/arm-smmu: Add Adreno SMMU specific implementation | expand |
On Thu 13 Aug 21:41 CDT 2020, Rob Clark wrote: > 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. > Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> > 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; > }; > -- > 2.26.2 >
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; };