linux-kernel - [PATCH v2 08/17] x86/apic: add modern APIC support for Hygon

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Date:   Mon, 23 Jul 2018 21:20:28 +0800
From:   Pu Wen <puwen@...on.cn>
To:     tglx@...utronix.de, bp@...en8.de, thomas.lendacky@....com,
        mingo@...hat.com, hpa@...or.com, peterz@...radead.org,
        tony.luck@...el.com, pbonzini@...hat.com, rkrcmar@...hat.com,
        boris.ostrovsky@...cle.com, jgross@...e.com, rjw@...ysocki.net,
        lenb@...nel.org, viresh.kumar@...aro.org, mchehab@...nel.org,
        trenn@...e.com, shuah@...nel.org, JBeulich@...e.com, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        kvm@...r.kernel.org, xen-devel@...ts.xenproject.org
Subject: [PATCH v2 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().

Signed-off-by: Pu Wen <puwen@...on.cn>
---
 arch/x86/kernel/apic/apic.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 2aabd4c..d8b7ac1 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -223,6 +223,11 @@ 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;
 }
 
@@ -1207,9 +1212,11 @@ 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;
 
 	/*
@@ -1908,6 +1915,8 @@ 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)))
-- 
2.7.4