Messages in this thread Patch in this message | | | Date | Wed, 7 Mar 2018 11:47:43 -0800 | From | Ivan Gorinov <> | Subject | [PATCH v4 4/4] x86/devicetree: Enable multiprocessing in DT |
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Current x86 Device Tree implementation does not support multiprocessing. Use new DT bindings to describe the processors.
Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com> --- arch/x86/kernel/devicetree.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c index 5cd387f..b28ac84 100644 --- a/arch/x86/kernel/devicetree.c +++ b/arch/x86/kernel/devicetree.c @@ -131,6 +131,30 @@ static void __init dtb_setup_hpet(void) #endif } +static void __init dtb_cpu_setup(void) +{ + struct device_node *dn; + struct resource r; + const void *prop; + int apic_id, version; + int ret; + + version = GET_APIC_VERSION(apic_read(APIC_LVR)); + for_each_node_by_type(dn, "cpu") { + prop = of_get_property(dn, "intel,apic-id", NULL); + if (prop) { + apic_id = be32_to_cpup(prop); + } else { + /* use the address field as APIC ID */ + ret = of_address_to_resource(dn, 0, &r); + if (WARN_ON_ONCE(ret)) + continue; + apic_id = r.start; + } + generic_processor_info(apic_id, version); + } +} + static void __init dtb_lapic_setup(void) { #ifdef CONFIG_X86_LOCAL_APIC @@ -154,8 +178,6 @@ static void __init dtb_lapic_setup(void) 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))); #endif } @@ -260,6 +282,7 @@ static void __init dtb_ioapic_setup(void) {} static void __init dtb_apic_setup(void) { dtb_lapic_setup(); + dtb_cpu_setup(); dtb_ioapic_setup(); } -- 2.7.4
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