[PATCH v8 4/9] of/iommu: Support dma-can-stall property

[Jean-Philippe Brucker]

Copy the dma-can-stall property into the fwspec structure.

Signed-off-by: Jean-Philippe Brucker <jean-philippe at linaro.org>
---
 include/linux/iommu.h    | 2 ++
 drivers/iommu/of_iommu.c | 5 ++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a1c78c4cdeb1..9076fb592c8f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -572,6 +572,7 @@ struct iommu_group *fsl_mc_device_group(struct device *dev);
  * @iommu_fwnode: firmware handle for this device's IOMMU
  * @iommu_priv: IOMMU driver private data for this device
  * @num_pasid_bits: number of PASID bits supported by this device
+ * @can_stall: the device is allowed to stall
  * @num_ids: number of associated device IDs
  * @ids: IDs which this device may present to the IOMMU
  */
@@ -579,6 +580,7 @@ struct iommu_fwspec {
 	const struct iommu_ops	*ops;
 	struct fwnode_handle	*iommu_fwnode;
 	u32			num_pasid_bits;
+	bool			can_stall;
 	unsigned int		num_ids;
 	u32			ids[];
 };
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index e505b9130a1c..d6255ca823d8 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -212,9 +212,12 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
 		err = of_iommu_configure_device(master_np, dev, id);
 
 		fwspec = dev_iommu_fwspec_get(dev);
-		if (!err && fwspec)
+		if (!err && fwspec) {
 			of_property_read_u32(master_np, "pasid-num-bits",
 					     &fwspec->num_pasid_bits);
+			fwspec->can_stall = of_property_read_bool(master_np,
+								  "dma-can-stall");
+		}
 	}
 
 	/*
-- 
2.29.1