[Xen-devel] [RFC PATCH 3/9] xen/arm: p2m: Add helper to convert p2m type to IOMMU flags

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

The helper has the same purpose as existing for x86 one.
It is used for choosing IOMMU mapping attribute according to
the memory type.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
---
 xen/include/asm-arm/p2m.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 0899523..4a93ba8 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -5,6 +5,7 @@
 #include <xen/radix-tree.h>
 #include <xen/rwlock.h>
 #include <xen/mem_access.h>
+#include <xen/iommu.h>
 #include <public/vm_event.h> /* for vm_event_response_t */
 #include <public/memory.h>
 #include <xen/p2m-common.h>
@@ -354,6 +355,39 @@ static inline gfn_t gfn_next_boundary(gfn_t gfn, unsigned 
int order)
     return gfn_add(gfn, 1UL << order);
 }
 
+/*
+ * p2m type to IOMMU flags
+ */
+static inline unsigned int p2m_get_iommu_flags(p2m_type_t p2mt)
+{
+    unsigned int flags;
+
+    switch( p2mt )
+    {
+    case p2m_ram_rw:
+    case p2m_iommu_map_rw:
+    case p2m_map_foreign:
+    case p2m_grant_map_rw:
+    case p2m_mmio_direct_dev:
+    case p2m_mmio_direct_nc:
+    case p2m_mmio_direct_c:
+        flags = IOMMUF_readable | IOMMUF_writable;
+        break;
+    case p2m_ram_ro:
+    case p2m_iommu_map_ro:
+    case p2m_grant_map_ro:
+        flags = IOMMUF_readable;
+        break;
+    default:
+        flags = 0;
+        break;
+    }
+
+    /* TODO Do we need to handle access permissions here? */
+
+    return flags;
+}
+
 #endif /* _XEN_P2M_H */
 
 /*
-- 
2.7.4


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