[PATCH v6 2/2] x86/devicetree: Use CPU description from Device Tree

[Ivan Gorinov]

Current x86 Device Tree implementation does not support multiprocessing.
Use new DT bindings to describe the processors.

Signed-off-by: Ivan Gorinov <ivan.gori...@intel.com>
---
 arch/x86/kernel/devicetree.c | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 5cd387f..a601f08 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -131,31 +131,46 @@ static void __init dtb_setup_hpet(void)
 #endif
 }
 
+static void __init dtb_cpu_setup(void)
+{
+       struct device_node *dn;
+       u32 apic_id, version;
+       int ret;
+
+       version = GET_APIC_VERSION(apic_read(APIC_LVR));
+       for_each_node_by_type(dn, "cpu") {
+               ret = of_property_read_u32(dn, "reg", &apic_id);
+               if (ret < 0) {
+                       pr_warn("%pOF: missing local APIC ID\n", dn);
+                       continue;
+               }
+               generic_processor_info(apic_id, version);
+       }
+}
+
 static void __init dtb_lapic_setup(void)
 {
 #ifdef CONFIG_X86_LOCAL_APIC
        struct device_node *dn;
        struct resource r;
+       unsigned long lapic_addr = APIC_DEFAULT_PHYS_BASE;
        int ret;
 
        dn = of_find_compatible_node(NULL, NULL, "intel,ce4100-lapic");
-       if (!dn)
-               return;
-
-       ret = of_address_to_resource(dn, 0, &r);
-       if (WARN_ON(ret))
-               return;
+       if (dn) {
+               ret = of_address_to_resource(dn, 0, &r);
+               if (WARN_ON(ret))
+                       return;
+               lapic_addr = r.start;
+       }
 
        /* Did the boot loader setup the local APIC ? */
        if (!boot_cpu_has(X86_FEATURE_APIC)) {
-               if (apic_force_enable(r.start))
+               if (apic_force_enable(lapic_addr))
                        return;
        }
-       smp_found_config = 1;
        pic_mode = 1;
-       register_lapic_address(r.start);
-       generic_processor_info(boot_cpu_physical_apicid,
-                              GET_APIC_VERSION(apic_read(APIC_LVR)));
+       register_lapic_address(lapic_addr);
 #endif
 }
 
@@ -260,6 +275,7 @@ static void __init dtb_ioapic_setup(void) {}
 static void __init dtb_apic_setup(void)
 {
        dtb_lapic_setup();
+       dtb_cpu_setup();
        dtb_ioapic_setup();
 }
 
@@ -297,6 +313,7 @@ void __init x86_dtb_init(void)
        if (!of_have_populated_dt())
                return;
 
+       smp_found_config = 1;
        dtb_setup_hpet();
        dtb_apic_setup();
 }
-- 
2.7.4