On Wed, Mar 04, 2015 at 03:51:06PM +0000, Baptiste Reynal wrote:
> This patch is a fix to "iommu/arm-smmu: add support for iova_to_phys
> through ATS1PR".
> According to ARM documentation, translation registers are optional even
> in SMMUv1, so ID0_S1TS needs to be checked to verify their presence.
> Also, we check that the domain is a stage-1 domain.
>
> Signed-off-by: Baptiste Reynal <b.rey...@virtualopensystems.com>
>
> ---
> v1 -> v2:
> Add domain stage test (Thanks to Will Deacon)
>
> ---
> drivers/iommu/arm-smmu.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index fc13dd5..a3adde6 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -1288,10 +1288,13 @@ static phys_addr_t arm_smmu_iova_to_phys(struct
> iommu_domain *domain,
> return 0;
>
> spin_lock_irqsave(&smmu_domain->pgtbl_lock, flags);
> - if (smmu_domain->smmu->features & ARM_SMMU_FEAT_TRANS_OPS)
> + if (smmu_domain->smmu->features & ARM_SMMU_FEAT_TRANS_OPS &&
> + smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
> ret = arm_smmu_iova_to_phys_hard(domain, iova);
> - else
> + } else {
> ret = ops->iova_to_phys(ops, iova);
> + }
> +
> spin_unlock_irqrestore(&smmu_domain->pgtbl_lock, flags);
>
> return ret;
> @@ -1556,7 +1559,7 @@ static int arm_smmu_device_cfg_probe(struct
> arm_smmu_device *smmu)
> return -ENODEV;
> }
>
> - if (smmu->version == 1 || (!(id & ID0_ATOSNS) && (id & ID0_S1TS))) {
> + if ((id & ID0_S1TS) && ((smmu->version == 1) || (id & ID0_ATOSNS))) {
> smmu->features |= ARM_SMMU_FEAT_TRANS_OPS;
> dev_notice(smmu->dev, "\taddress translation ops\n");
Acked-by: Will Deacon <will.dea...@arm.com>
Sorry Joerg, but this is the latest in the drip of ARM SMMU fixes for
4.0! Please pick it up with the rest.
Will
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