[Xen-devel] [RFC PATCH v3 18/18] xen/arm: ITS: 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 for all physical ITS available,
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 |   32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index 00e210f..7cf029a 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -1174,6 +1174,36 @@ static const struct mmio_handler_ops 
vgic_gits_mmio_handler = {
     .write_handler = vgic_v3_gits_mmio_write,
 };
 
+/*
+ * Map the 64K ITS translation space in guest.
+ * This is required purely for device smmu writes.
+*/
+
+//static int vgic_map_translation_space(uint32_t nr_its, struct domain *d)
+static int vgic_map_translation_space(struct domain *d)
+{
+    uint64_t 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 )
+     {
+          dprintk(XENLOG_G_ERR, "vITS: 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)
 {
     int i;
@@ -1210,7 +1240,7 @@ int vgic_its_domain_init(struct domain *d)
                           d->arch.vits->phys_base,
                           SZ_64K);
 
-    return 0;
+    return vgic_map_translation_space(d);
 }
 
 void vgic_its_init(void)
-- 
1.7.9.5


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