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Subject[RFC PATCH 2/6] iommu/of: Add stall and pasid properties to iommu_fwspec
Date
From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>

Add stall and pasid properties to iommu_fwspec.

Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@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
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