[Xen-devel] [RFC PATCH v3 07/12] arch/arm: create device tree nodes for hwdom cpufreq cpu driver

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

This patch copies all cpu@xxxxxx@N nodes (from input
device tree) with properties to /hypervisor/pcpus
node (device tree for hwdom). Thus we can give all
information about all physical CPUs in the pcpus node.
Driver in hwdom should parse /hypervisor/pcpus path
instead of the /cpus path in the device tree.

Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 67 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 2db0236..2186514 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -326,6 +326,69 @@ static int make_memory_node(const struct domain *d,
     return res;
 }
 
+#ifdef HAS_CPUFREQ
+static int fdt_copy_phys_cpus_nodes(void *fdt)
+{
+    int res;
+    const struct dt_device_node *cpus = dt_find_node_by_path("/cpus");
+    const struct dt_device_node *npcpu;
+    const struct dt_property *pp;
+    char *node_name;
+
+    if ( !cpus )
+    {
+        dprintk(XENLOG_ERR, "Missing /cpus node in the device tree?\n");
+        return -ENOENT;
+    }
+
+    /*
+     * create pcpus node and copy to it
+     * original cpu@xxxxxx@N nodes with its properties.
+     * This is needed for the cpufreq cpu driver in Dom0
+     */
+    DPRINT("Create pcpus node\n");
+
+    res = fdt_begin_node(fdt, "pcpus");
+    if ( res )
+        return res;
+
+    dt_for_each_child_node( cpus, npcpu )
+    {
+        if ( dt_device_type_is_equal(npcpu, "cpu") )
+        {
+            node_name = strrchr(dt_node_full_name(npcpu), '/');
+            node_name++;
+
+            ASSERT(node_name && *node_name);
+
+            DPRINT("Copy %s node to the pcpus\n", node_name);
+
+            res = fdt_begin_node(fdt, node_name);
+            if ( res )
+                return res;
+
+            dt_for_each_property_node( npcpu, pp )
+            {
+                if ( pp->length )
+                {
+                    res = fdt_property(fdt, pp->name, pp->value,
+                                        pp->length);
+                    if ( res )
+                        return res;
+                }
+            }
+
+            res = fdt_end_node(fdt);
+            if ( res )
+                return res;
+        }
+    }
+
+    res = fdt_end_node(fdt);
+    return res;
+}
+#endif /* HAS_CPUFREQ */
+
 static int make_hypervisor_node(struct domain *d,
                                 void *fdt, const struct dt_device_node *parent)
 {
@@ -386,6 +449,10 @@ static int make_hypervisor_node(struct domain *d,
     if ( res )
         return res;
 
+    #ifdef HAS_CPUFREQ
+    fdt_copy_phys_cpus_nodes(fdt);
+    #endif
+
     res = fdt_end_node(fdt);
 
     return res;
-- 
1.9.1


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