[Xen-devel] [RFC PATCH 14/19] xen/arm: vits: Map ITS translation space

[vijay.kilari@xxxxxxxxx]

From: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>

ITS translation space contains GITS_TRANSLATOR
register which is written by device to raise
LPI. This space needs to mapped to every domain
address space so that device can access GITS_TRANSLATOR
register using SMMU

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@xxxxxxxxxxxxxxxxxx>
---
 xen/arch/arm/vgic-v3-its.c |   33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index 48c880a..e7e587e 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -1504,7 +1504,35 @@ static const struct mmio_handler_ops 
vgic_gits_mmio_handler = {
     .write_handler = vgic_v3_gits_mmio_write,
 };
 
-int vgic_its_domain_init(struct domain *d)
+/*
+ * Map the 64K ITS translation space in guest.
+ * This is required purely for device smmu writes.
+ */
+
+static int vgic_map_translation_space(struct domain *d)
+{
+    u64 addr, size;
+    int ret;
+    addr = d->arch.vits->phys_base + SZ_64K;
+    size = SZ_64K;
+
+    ret = map_mmio_regions(d,
+                           paddr_to_pfn(addr & PAGE_MASK),
+                           DIV_ROUND_UP(size, PAGE_SIZE),
+                           paddr_to_pfn(addr & PAGE_MASK));
+
+     if ( ret )
+     {
+          printk(XENLOG_ERR "Unable to map to dom%d access to"
+                 " 0x%"PRIx64" - 0x%"PRIx64"\n",
+                 d->domain_id,
+                 addr & PAGE_MASK, PAGE_ALIGN(addr + size) - 1);
+     }
+
+    return ret;
+}
+
+int vgic_its_domain_init(struct domain *d) 
 {
     d->arch.vits = xzalloc(struct vgic_its);
     if ( d->arch.vits == NULL )
@@ -1516,9 +1544,10 @@ int vgic_its_domain_init(struct domain *d)
     register_mmio_handler(d, &vgic_gits_mmio_handler, d->arch.vits->phys_base,
                           SZ_64K);
 
-    return 0;
+    return vgic_map_translation_space(d);
 }
 
+
 /*
  * Local variables:
  * mode: C
-- 
1.7.9.5


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