[Xen-devel] [PATCH RFC 27/35] arm: acpi map mmio regions to dom0

[parth.dixit@xxxxxxxxxx]

From: Parth Dixit <parth.dixit@xxxxxxxxxx>

map mmio regions described in uefi tables to dom0 address space

Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 54 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index d781c63..49eb52a 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1235,6 +1235,56 @@ static int make_chosen_node(const struct domain *d, 
const struct kernel_info *ki
     return res;
 }
 
+static int acpi_map_mmio(struct domain *d)
+{
+    int i,res;
+    u64 addr,size;
+
+    for( i = 0; i < acpi_mmio.nr_banks; i++ )
+    {
+        addr = acpi_mmio.bank[i].start;
+        size = acpi_mmio.bank[i].size;
+
+        res = iomem_permit_access(d, paddr_to_pfn(addr & PAGE_MASK),
+                                    paddr_to_pfn(PAGE_ALIGN(addr + size - 1)));
+        if ( res )
+        {
+            printk(XENLOG_ERR "Unable to permit to dom%d access to"
+                   " 0x%"PRIx64" - 0x%"PRIx64"\n",
+                   d->domain_id,
+                   addr & PAGE_MASK, PAGE_ALIGN(addr + size) - 1);
+            return res;
+        }
+
+        res = map_mmio_regions(d,
+                                paddr_to_pfn(addr & PAGE_MASK),
+                                DIV_ROUND_UP(size, PAGE_SIZE),
+                                paddr_to_pfn(addr & PAGE_MASK));
+        if ( res )
+        {
+            printk(XENLOG_ERR "Unable to map 0x%"PRIx64
+                   " - 0x%"PRIx64" in domain %d\n",
+                   addr & PAGE_MASK, PAGE_ALIGN(addr + size) - 1,
+                   d->domain_id);
+            return res;
+        }
+
+    }
+
+     return 0;
+}
+
+static int map_acpi_regions(struct domain *d)
+{
+    int res;
+
+    res = acpi_map_mmio(d);
+    if ( res )
+        return res;
+
+    return 0;
+}
+
 /*
  * Prepare a minimal DTB for DOM0 which contains
  * bootargs, memory information,
@@ -1264,6 +1314,10 @@ static int prepare_dtb_acpi(struct domain *d, struct 
kernel_info *kinfo)
     if ( ret < 0 )
         goto err;
 
+    ret = map_acpi_regions(d);
+    if ( ret < 0 )
+        goto err;
+
     ret = fdt_begin_node(kinfo->fdt, "/");
     if ( ret < 0 )
         goto err;
-- 
1.9.1


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