linux-kernel - [PATCH v3 08/17] x86/apic: add modern APIC support for Hygon

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Date:   Sat, 11 Aug 2018 21:27:58 +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 v3 08/17] x86/apic: add modern APIC support for Hygon

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@...on.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 adbda58..0ddb4e2 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -219,10 +219,15 @@ 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;
 }
 
@@ -1210,9 +1215,11 @@ 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;
 
 	/*
@@ -1911,6 +1918,8 @@ 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