[Xen-devel] [RFC PATCH 09/13] arch/arm: create device tree nodes for Dom0 cpufreq cpu driver

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

This patch copies all cpu@xxxxxx@N nodes (from input
device tree) with properties to /cpus/cpu@0/private_data
node (device tree for Dom0). Thus we can have any number
of VCPUs in Dom0 and we give all information about all
physical CPUs in the private_data node. Driver in Dom0
should parse /cpus/cpu@0/private_data path instead of the
/cpus path in the device tree.

Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 58 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 2db0236..a142cc4 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -436,6 +436,10 @@ static int make_cpus_node(const struct domain *d, void 
*fdt,
     char buf[15];
     u32 clock_frequency;
     bool_t clock_valid;
+#ifdef HAS_CPUFREQ
+    const struct dt_property *pp;
+    char *node_name;
+#endif
 
     DPRINT("Create cpus node\n");
 
@@ -517,6 +521,60 @@ static int make_cpus_node(const struct domain *d, void 
*fdt,
                 return res;
         }
 
+#ifdef HAS_CPUFREQ
+        /*
+         * Add "private_data" node to cpu@0 and copy to it
+         * original cpu@xxxxxx@N nodes with its properties.
+         * This is needed for the cpufreq cpu driver in Dom0
+         */
+        if ( cpu == 0 )
+        {
+            DPRINT("Create private_data node\n");
+
+            res = fdt_begin_node(fdt, "private_data");
+            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), '/');
+                    if ( node_name )
+                        node_name++;
+
+                    if ( node_name && *node_name )
+                    {
+                        DPRINT("Copy %s node to the private_data\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);
+            if ( res )
+                return res;
+        }
+#endif /* HAS_CPUFREQ */
+
         res = fdt_end_node(fdt);
         if ( res )
             return res;
-- 
1.9.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel