[PATCH 3/4] amd iommu: Large io page support - enablement

[Wei Wang2 <wei.wang2@amd.com>]

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Enable super iommu support on amd systems.
Thanks,
We
Signed-off-by: Wei Wang <wei.wang2@amd.com>
--
Legal Information:
Advanced Micro Devices GmbH
Sitz: Dornach, Gemeinde Aschheim, 
Landkreis München Registergericht München, 
HRB Nr. 43632
Geschäftsführer:
Alberto Bozzo, Andrew Bowd

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diff -r 81606e1d202e xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c	Wed Dec 01 16:13:30 2010 +0100
+++ b/xen/arch/x86/mm/p2m.c	Wed Dec 01 17:11:16 2010 +0100
@@ -1381,7 +1381,16 @@ p2m_set_entry(struct p2m_domain *p2m, un
          && (gfn + (1UL << page_order) - 1 > p2m->max_mapped_pfn) )
         p2m->max_mapped_pfn = gfn + (1UL << page_order) - 1;
 
-    if ( iommu_enabled && need_iommu(p2m->domain) )
+    if ( iommu_enabled && iommu_super_page )
+    {
+        if ( p2mt == p2m_ram_rw )
+            iommu_map_pages(p2m->domain, gfn, mfn_x(mfn),
+                            page_order, IOMMUF_readable|IOMMUF_writable);
+        else
+            iommu_unmap_pages(p2m->domain, gfn, page_order);
+    }
+
+    else if ( iommu_enabled && need_iommu(p2m->domain) )
     {
         if ( p2mt == p2m_ram_rw )
             for ( i = 0; i < (1UL << page_order); i++ )
diff -r 81606e1d202e xen/drivers/passthrough/iommu.c
--- a/xen/drivers/passthrough/iommu.c	Wed Dec 01 16:13:30 2010 +0100
+++ b/xen/drivers/passthrough/iommu.c	Wed Dec 01 17:11:16 2010 +0100
@@ -111,6 +111,9 @@ void __init iommu_dom0_init(struct domai
     if ( !iommu_enabled )
         return;
 
+    if ( hd->platform_ops->map_pages == NULL )
+        iommu_super_page = 0;
+
     d->need_iommu = !!iommu_dom0_strict;
     if ( need_iommu(d) )
     {
@@ -177,7 +180,11 @@ int assign_device(struct domain *d, u8 b
     if ( has_arch_pdevs(d) && !need_iommu(d) )
     {
         d->need_iommu = 1;
-        rc = iommu_populate_page_table(d);
+        /* Populate iommu page table when hardware does not
+        support super IO page */
+        if ( (hd->platform_ops->map_pages == NULL) ||
+             (!iommu_super_page) )
+            rc = iommu_populate_page_table(d);
         goto done;
     }
 done:    
@@ -420,6 +427,33 @@ void iommu_suspend()
         ops->suspend();
 }
 
+int iommu_map_pages(struct domain *d, unsigned long gfn,
+    unsigned long mfn, unsigned int order,  unsigned int flags)
+{
+    struct hvm_iommu *hd = domain_hvm_iommu(d);
+
+    if ( !iommu_enabled || !hd->platform_ops )
+        return 0;
+
+    if ( hd->platform_ops->map_pages != NULL )
+        return hd->platform_ops->map_pages(d, gfn, mfn, order, flags);
+
+    return 0;
+}
+
+int iommu_unmap_pages(struct domain *d, unsigned long gfn, unsigned int order)
+{
+    struct hvm_iommu *hd = domain_hvm_iommu(d);
+
+    if ( !iommu_enabled || !hd->platform_ops )
+        return 0;
+
+    if ( hd->platform_ops->map_pages != NULL )
+        return hd->platform_ops->unmap_pages(d, gfn, order);
+
+    return 0;
+}
+
 /*
  * Local variables:
  * mode: C

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