This patch is added as instead of returning a boolean for DOMAIN_ATTR_NESTING,
iommu_domain_get_attr() should return an iommu_nesting_info handle. For
now, return an empty nesting info struct for now as true nesting is not
yet supported by the SMMUs.
Cc: Will Deacon <w...@kernel.org>
Cc: Robin Murphy <robin.mur...@arm.com>
Cc: Eric Auger <eric.au...@redhat.com>
Cc: Jean-Philippe Brucker <jean-phili...@linaro.org>
Suggested-by: Jean-Philippe Brucker <jean-phili...@linaro.org>
Signed-off-by: Liu Yi L <yi.l....@intel.com>
Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
Reviewed-by: Eric Auger <eric.au...@redhat.com>
---
v5 -> v6:
*) add review-by from Eric Auger.
v4 -> v5:
*) address comments from Eric Auger.
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 +++++++++++++++++++++++++++--
drivers/iommu/arm/arm-smmu/arm-smmu.c | 29 +++++++++++++++++++++++++++--
2 files changed, 54 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 7196207..016e2e5 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3019,6 +3019,32 @@ static struct iommu_group *arm_smmu_device_group(struct
device *dev)
return group;
}
+static int arm_smmu_domain_nesting_info(struct arm_smmu_domain *smmu_domain,
+ void *data)
+{
+ struct iommu_nesting_info *info = (struct iommu_nesting_info *)data;
+ unsigned int size;
+
+ if (!info || smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
+ return -ENODEV;
+
+ size = sizeof(struct iommu_nesting_info);
+
+ /*
+ * if provided buffer size is smaller than expected, should
+ * return 0 and also the expected buffer size to caller.
+ */
+ if (info->argsz < size) {
+ info->argsz = size;
+ return 0;
+ }
+
+ /* report an empty iommu_nesting_info for now */
+ memset(info, 0x0, size);
+ info->argsz = size;
+ return 0;
+}
+
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
@@ -3028,8 +3054,7 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
case IOMMU_DOMAIN_UNMANAGED:
switch (attr) {
case DOMAIN_ATTR_NESTING:
- *(int *)data = (smmu_domain->stage ==
ARM_SMMU_DOMAIN_NESTED);
- return 0;
+ return arm_smmu_domain_nesting_info(smmu_domain, data);
default:
return -ENODEV;
}
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c
b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 09c42af9..368486f 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1510,6 +1510,32 @@ static struct iommu_group *arm_smmu_device_group(struct
device *dev)
return group;
}
+static int arm_smmu_domain_nesting_info(struct arm_smmu_domain *smmu_domain,
+ void *data)
+{
+ struct iommu_nesting_info *info = (struct iommu_nesting_info *)data;
+ unsigned int size;
+
+ if (!info || smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
+ return -ENODEV;
+
+ size = sizeof(struct iommu_nesting_info);
+
+ /*
+ * if provided buffer size is smaller than expected, should
+ * return 0 and also the expected buffer size to caller.
+ */
+ if (info->argsz < size) {
+ info->argsz = size;
+ return 0;
+ }
+
+ /* report an empty iommu_nesting_info for now */
+ memset(info, 0x0, size);
+ info->argsz = size;
+ return 0;
+}
+
static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
@@ -1519,8 +1545,7 @@ static int arm_smmu_domain_get_attr(struct iommu_domain
*domain,
case IOMMU_DOMAIN_UNMANAGED:
switch (attr) {
case DOMAIN_ATTR_NESTING:
- *(int *)data = (smmu_domain->stage ==
ARM_SMMU_DOMAIN_NESTED);
- return 0;
+ return arm_smmu_domain_nesting_info(smmu_domain, data);
default:
return -ENODEV;
}
--
2.7.4
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