[Qemu-devel] [RFC 5/6] hw/arm/sysbus-fdt: enable vsmmu dynamic instantiation

[Baptiste Reynal <b.reynal@virtualopensystems.com>]

This patch adds the device tree node creation for the vSMMU.

Signed-off-by: Baptiste Reynal <b.reynal@virtualopensystems.com>
---
 hw/arm/sysbus-fdt.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/hw/arm/sysbus-fdt.c b/hw/arm/sysbus-fdt.c
index 3038b94..67f4425 100644
--- a/hw/arm/sysbus-fdt.c
+++ b/hw/arm/sysbus-fdt.c
@@ -26,6 +26,10 @@
 #include "sysemu/device_tree.h"
 #include "hw/platform-bus.h"
 #include "sysemu/sysemu.h"
+#include "hw/vfio/vfio-platform.h"
+#include "hw/vfio/vfio-smmu.h"
+
+#include <libfdt.h>
 
 /*
  * internal struct that contains the information to create dynamic
@@ -53,8 +57,47 @@ typedef struct NodeCreationPair {
     int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
 } NodeCreationPair;
 
+VFIOSmmuDevice *vsmmu = NULL;
+
+static int add_arm_smmu_fdt_node(SysBusDevice *sbdev, void *opaque)
+{
+    PlatformBusFDTData *data = opaque;
+    vsmmu = VFIO_SMMU_DEVICE(sbdev);
+    void *fdt = data->fdt;
+    const char *nodename;
+    uint32_t reg_attr[4], irq_attr[3];
+    uint32_t gint = 0;
+
+    nodename = g_strdup_printf("/smmu@%" PRIx64, vsmmu->base);
+
+    qemu_fdt_add_subnode(fdt, nodename);
+    qemu_fdt_setprop(fdt, nodename, "compatible", "arm,smmu-v2", 12);
+
+    reg_attr[0] = 0;
+    reg_attr[1] = cpu_to_be32(vsmmu->base);
+    reg_attr[2] = 0;
+    reg_attr[3] = cpu_to_be32(vsmmu->size);
+
+    qemu_fdt_setprop(fdt, nodename, "reg",
+            reg_attr, 4*sizeof(uint32_t));
+
+    /* Add dummy interrupt */
+    irq_attr[0] = 0;
+    irq_attr[1] = 0;
+    irq_attr[2] = 0;
+
+    qemu_fdt_setprop(fdt, nodename, "interrupts",
+            irq_attr, 3*sizeof(uint32_t));
+
+    qemu_fdt_setprop(fdt, nodename, "#global-interrupts", &gint,
+            sizeof(uint32_t));
+
+    return 0;
+}
+
 /* list of supported dynamic sysbus devices */
 static const NodeCreationPair add_fdt_node_functions[] = {
+    {TYPE_VFIO_SMMU, add_arm_smmu_fdt_node},
     {"", NULL}, /* last element */
 };
 
-- 
2.4.3