iommu/arm-smmu: put iommu_domain pointer in dev->archdata.iommu
In preparation for nested translation support, stick a pointer to the
iommu_domain in dev->archdata.iommu. This makes it much easier to grab
hold of the physical group configuration (e.g. cbndx) when dealing with
vSMMU accesses from a guest.
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 38f8d67..e8d31115 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1213,6 +1213,11 @@
return -ENXIO;
}
+ if (dev->archdata.iommu) {
+ dev_err(dev, "already attached to IOMMU domain\n");
+ return -EEXIST;
+ }
+
/*
* Sanity check the domain. We don't support domains across
* different SMMUs.
@@ -1239,7 +1244,10 @@
if (!cfg)
return -ENODEV;
- return arm_smmu_domain_add_master(smmu_domain, cfg);
+ ret = arm_smmu_domain_add_master(smmu_domain, cfg);
+ if (!ret)
+ dev->archdata.iommu = domain;
+ return ret;
}
static void arm_smmu_detach_dev(struct iommu_domain *domain, struct device *dev)
@@ -1248,8 +1256,11 @@
struct arm_smmu_master_cfg *cfg;
cfg = find_smmu_master_cfg(dev);
- if (cfg)
- arm_smmu_domain_remove_master(smmu_domain, cfg);
+ if (!cfg)
+ return;
+
+ dev->archdata.iommu = NULL;
+ arm_smmu_domain_remove_master(smmu_domain, cfg);
}
static bool arm_smmu_pte_is_contiguous_range(unsigned long addr,