summaryrefslogtreecommitdiff
path: root/drivers/iommu
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd/iommu.c46
1 files changed, 27 insertions, 19 deletions
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 07c47a7088be..771709d1dfff 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -85,6 +85,7 @@ struct iommu_cmd {
struct kmem_cache *amd_iommu_irq_cache;
static void detach_device(struct device *dev);
+static int domain_enable_v2(struct protection_domain *domain, int pasids);
/****************************************************************************
*
@@ -2450,11 +2451,10 @@ void amd_iommu_domain_direct_map(struct iommu_domain *dom)
}
EXPORT_SYMBOL(amd_iommu_domain_direct_map);
-int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
+/* Note: This function expects iommu_domain->lock to be held prior calling the function. */
+static int domain_enable_v2(struct protection_domain *domain, int pasids)
{
- struct protection_domain *domain = to_pdomain(dom);
- unsigned long flags;
- int levels, ret;
+ int levels;
/* Number of GCR3 table levels required */
for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
@@ -2463,7 +2463,25 @@ int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
if (levels > amd_iommu_max_glx_val)
return -EINVAL;
- spin_lock_irqsave(&domain->lock, flags);
+ domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
+ if (domain->gcr3_tbl == NULL)
+ return -ENOMEM;
+
+ domain->glx = levels;
+ domain->flags |= PD_IOMMUV2_MASK;
+
+ amd_iommu_domain_update(domain);
+
+ return 0;
+}
+
+int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
+{
+ struct protection_domain *pdom = to_pdomain(dom);
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&pdom->lock, flags);
/*
* Save us all sanity checks whether devices already in the
@@ -2471,24 +2489,14 @@ int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
* devices attached when it is switched into IOMMUv2 mode.
*/
ret = -EBUSY;
- if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK)
- goto out;
-
- ret = -ENOMEM;
- domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
- if (domain->gcr3_tbl == NULL)
+ if (pdom->dev_cnt > 0 || pdom->flags & PD_IOMMUV2_MASK)
goto out;
- domain->glx = levels;
- domain->flags |= PD_IOMMUV2_MASK;
-
- amd_iommu_domain_update(domain);
-
- ret = 0;
+ if (!pdom->gcr3_tbl)
+ ret = domain_enable_v2(pdom, pasids);
out:
- spin_unlock_irqrestore(&domain->lock, flags);
-
+ spin_unlock_irqrestore(&pdom->lock, flags);
return ret;
}
EXPORT_SYMBOL(amd_iommu_domain_enable_v2);