[PATCH v5 08/16] x86/apic: add modern APIC support for Hygon

Pu Wen
2018-08-29T12:44:49Z

Hygon processors use modern APIC, so just return in modern_apic() and
sync_Arb_IDs(). And should break in switch case in detect_init_API().

When running on 32 bit mode, should set bigsmp if there are more than
8 cores.

Signed-off-by: Pu Wen <puwen@hygon.cn>
---
arch/x86/kernel/apic/apic.c | 19 ++++++++++++++-----
arch/x86/kernel/apic/probe_32.c | 1 +
2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 84132ed..a62968e 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -220,10 +220,15 @@ static inline int lapic_is_integrated(void)
*/
static int modern_apic(void)
{
- /* AMD systems use old APIC versions, so check the CPU */
- if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
- boot_cpu_data.x86 >= 0xf)
+ /*
+ * Old AMD systems use old APIC versions, newer AMD systems
+ * and Hygon systems use modern APIC, so check the CPU
+ */
+ if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+ boot_cpu_data.x86 >= 0xf) ||
+ boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
return 1;
+
return lapic_get_version() >= 0x14;
}

@@ -1211,9 +1216,11 @@ void __init sync_Arb_IDs(void)
{
/*
* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
- * needed on AMD.
+ * needed on AMD or Hygon.
*/
- if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
+ if (modern_apic() ||
+ boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+ boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
return;

/*
@@ -1912,6 +1919,8 @@ static int __init detect_init_APIC(void)
(boot_cpu_data.x86 >= 15))
break;
goto no_apic;
+ case X86_VENDOR_HYGON:
+ break;
case X86_VENDOR_INTEL:
if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 ||
(boot_cpu_data.x86 == 5 && boot_cpu_has(X86_FEATURE_APIC)))
diff --git a/arch/x86/kernel/apic/probe_32.c b/arch/x86/kernel/apic/probe_32.c
index 02e8acb..47ff297 100644
--- a/arch/x86/kernel/apic/probe_32.c
+++ b/arch/x86/kernel/apic/probe_32.c
@@ -185,6 +185,7 @@ void __init default_setup_apic_routing(void)
break;
}
/* If P4 and above fall through */
+ case X86_VENDOR_HYGON:
case X86_VENDOR_AMD:
def_to_bigsmp = 1;
}
--
2.7.4