[PATCH v2 15/40] iommu/of: Add stall and pasid properties to iommu_fwspec

Jean-Philippe Brucker
2018-05-11T19:06:16Z

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: Jean-Philippe Brucker <jean-philippe.brucker-5wv7dgnIgG8@public.gmane.org>
---
drivers/iommu/of_iommu.c | 12 ++++++++++++
include/linux/iommu.h | 2 ++
2 files changed, 14 insertions(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 5c36a8b7656a..9b6b55f3cccd 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -204,6 +204,18 @@ 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);
+ }
}

/*
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 933100678f64..bcce44455117 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -656,6 +656,8 @@ 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];
};

--
2.17.0