iommu/of: Add stall and pasid properties to iommu_fwspec

hulk inclusion
category: feature
bugzilla: 14369
CVE: NA
-------------------

Add stall and pasid properties to iommu_fwspec, and fill them when
dma-can-stall and pasid-bits properties are present in the device tree.
Signed-off-by: NJean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: NFang Lijun <fanglijun3@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>
Reviewed-by: NZhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/iommu/of_iommu.c

@@ -187,6 +187,19 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
 			if (err)
 				break;
 		}
+
+		fwspec = dev->iommu_fwspec;
+		if (!err && fwspec) {
+			const __be32 *prop;
+
+			if (of_get_property(master_np, "dma-can-stall", NULL))
+				fwspec->can_stall = true;
+
+			prop = of_get_property(master_np,
+						"pasid-num-bits", NULL);
+			if (prop)
+				fwspec->num_pasid_bits = be32_to_cpu(*prop);
+		}
 	}
 
 	/*

include/linux/iommu.h

@@ -650,6 +650,8 @@ struct iommu_fwspec {
 	struct fwnode_handle	*iommu_fwnode;
 	void			*iommu_priv;
 	unsigned int		num_ids;
+	unsigned int		num_pasid_bits;
+	bool			can_stall;
 	u32			ids[1];
 };