[RFC PATCH 2/6] iommu/of: Add stall and pasid properties to iommu_fwspec

[Yisheng Xie]

From: Jean-Philippe Brucker <jean-philippe.bruc...@arm.com>

Add stall and pasid properties to iommu_fwspec.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.bruc...@arm.com>
---
 drivers/iommu/of_iommu.c | 11 +++++++++++
 include/linux/iommu.h    |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 84fa6b4..b926276 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -209,6 +209,16 @@ static bool of_pci_rc_supports_ats(struct device_node 
*rc_node)
                        break;
        }
 
+       if (dev->iommu_fwspec) {
+               const __be32 *prop;
+
+               if (of_get_property(np, "dma-can-stall", NULL))
+                       dev->iommu_fwspec->can_stall = true;
+
+               prop = of_get_property(np, "pasid-bits", NULL);
+               if (prop)
+                       dev->iommu_fwspec->num_pasid_bits = be32_to_cpu(*prop);
+       }
+
        return ops;
 }
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 1c5a216..5f580de 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -387,6 +387,8 @@ struct iommu_fwspec {
        void                    *iommu_priv;
        u32                     flags;
        unsigned int            num_ids;
+       unsigned long           num_pasid_bits;
+       bool                    can_stall;
        u32                     ids[1];
 };
 
-- 
1.7.12.4

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu