linux-kernel - [PATCH v6 08/16] x86/apic: Add Hygon Dhyana support to APIC

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Date:   Mon, 10 Sep 2018 21:17:27 +0800
From:   Pu Wen <puwen@...on.cn>
To:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, thomas.lendacky@....com, bp@...en8.de,
        pbonzini@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Pu Wen <puwen@...on.cn>
Subject: [PATCH v6 08/16] x86/apic: Add Hygon Dhyana support to APIC

Add Hygon Dhyana support to the APIC subsystem as it use modern APIC.
When running on 32 bit mode, bigsmp should be enabled if there are
more than 8 cores online.

Signed-off-by: Pu Wen <puwen@...on.cn>
---
 arch/x86/kernel/apic/apic.c     | 13 +++++++++++--
 arch/x86/kernel/apic/probe_32.c |  1 +
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 84132ed..709daf2 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -224,6 +224,11 @@ static int modern_apic(void)
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
 	    boot_cpu_data.x86 >= 0xf)
 		return 1;
+
+	/* Hygon systems use modern APIC */
+	if (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