[Xen-devel] [RFC PATCH v2 17/22] 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>
---
v2: - Map for all physical ITS nodes
---
 xen/arch/arm/vgic-v3-its.c |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/xen/arch/arm/vgic-v3-its.c b/xen/arch/arm/vgic-v3-its.c
index f1d68d9..1447e91 100644
--- a/xen/arch/arm/vgic-v3-its.c
+++ b/xen/arch/arm/vgic-v3-its.c
@@ -1394,6 +1394,34 @@ 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)
+{
+    uint64_t addr, size;
+    int ret;
+
+    addr = d->arch.vits[nr_its].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)
 {
     uint32_t num_its;
@@ -1420,6 +1448,8 @@ int vgic_its_domain_init(struct domain *d)
          register_mmio_handler(d, &vgic_gits_mmio_handler,
                                d->arch.vits[i].phys_base,
                                SZ_64K);
+
+        return vgic_map_translation_space(i, d);
     }
 
     return 0;
-- 
1.7.9.5


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