The Adreno GPU has the capacity to manage its own pagetables and switch
them dynamically from the hardware. Add a domain attribute for arm-smmu-v2
to get the default pagetable configuration so that the GPU driver can match
the format for its own pagetables.
Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
---
drivers/iommu/arm-smmu.c | 12 ++++++++++++
include/linux/iommu.h | 1 +
2 files changed, 13 insertions(+)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index ce6d654301bf..4bd247dfd703 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1714,6 +1714,18 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
return 0;
+ case DOMAIN_ATTR_PGTABLE_CFG: {
+ struct io_pgtable *pgtable;
+ struct io_pgtable_cfg *dest = data;
+
+ if (!smmu_domain->pgtbl_ops)
+ return -ENODEV;
+
+ pgtable = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops);
+
+ memcpy(dest, &pgtable->cfg, sizeof(*dest));
+ return 0;
+ }
default:
return -ENODEV;
}
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5f0b7859d2eb..2388117641f1 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -124,6 +124,7 @@ enum iommu_attr {
DOMAIN_ATTR_FSL_PAMUV1,
DOMAIN_ATTR_NESTING, /* two stages of translation */
DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
+ DOMAIN_ATTR_PGTABLE_CFG,
DOMAIN_ATTR_MAX,
};
--
2.17.1
