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From:   Pu Wen <puwen@hygon.cn>
To:     tglx@linutronix.de, bp@alien8.de, thomas.lendacky@amd.com,
        mingo@redhat.com, hpa@zytor.com, peterz@infradead.org,
        tony.luck@intel.com, pbonzini@redhat.com, rkrcmar@redhat.com,
        boris.ostrovsky@oracle.com, jgross@suse.com, rjw@rjwysocki.net,
        lenb@kernel.org, viresh.kumar@linaro.org, mchehab@kernel.org,
        trenn@suse.com, shuah@kernel.org, JBeulich@suse.com, x86@kernel.org
Cc:     linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
        kvm@vger.kernel.org, xen-devel@lists.xenproject.org
Subject: [PATCH v2 03/17] x86/mtrr: get MTRR number and support TOP_MEM2
Date:   Mon, 23 Jul 2018 21:20:23 +0800
Message-Id: <1532352037-7151-4-git-send-email-puwen@hygon.cn>
In-Reply-To: <1532352037-7151-1-git-send-email-puwen@hygon.cn>
References: <1532352037-7151-1-git-send-email-puwen@hygon.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hygon CPU have a special magic MSR way to force WB for memory >4GB,
and also support TOP_MEM2. Therefore, it is necessary to add Hygon
support in amd_special_default_mtrr().

The MtrrFixDramModEn bit on Hygon platform should also be set to 1 during
BIOS initialization of the fixed MTRRs, then cleared to 0 for operation.

The number of variable MTRRs for Hygon is 2 as AMD's.

Signed-off-by: Pu Wen <puwen@hygon.cn>
---
 arch/x86/kernel/cpu/mtrr/cleanup.c | 3 ++-
 arch/x86/kernel/cpu/mtrr/generic.c | 3 ++-
 arch/x86/kernel/cpu/mtrr/mtrr.c    | 2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mtrr/cleanup.c b/arch/x86/kernel/cpu/mtrr/cleanup.c
index 765afd5..3668c5d 100644
--- a/arch/x86/kernel/cpu/mtrr/cleanup.c
+++ b/arch/x86/kernel/cpu/mtrr/cleanup.c
@@ -831,7 +831,8 @@ int __init amd_special_default_mtrr(void)
 {
 	u32 l, h;
 
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
+	    boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 		return 0;
 	if (boot_cpu_data.x86 < 0xf)
 		return 0;
diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
index e12ee86..71f868f 100644
--- a/arch/x86/kernel/cpu/mtrr/generic.c
+++ b/arch/x86/kernel/cpu/mtrr/generic.c
@@ -49,7 +49,8 @@ static inline void k8_check_syscfg_dram_mod_en(void)
 {
 	u32 lo, hi;
 
-	if (!((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
+	if (!((boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
+	       boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) &&
 	      (boot_cpu_data.x86 >= 0x0f)))
 		return;
 
diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtrr.c
index 9a19c80..507039c 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.c
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.c
@@ -127,7 +127,7 @@ static void __init set_num_var_ranges(void)
 
 	if (use_intel())
 		rdmsr(MSR_MTRRcap, config, dummy);
-	else if (is_cpu(AMD))
+	else if (is_cpu(AMD) || is_cpu(HYGON))
 		config = 2;
 	else if (is_cpu(CYRIX) || is_cpu(CENTAUR))
 		config = 8;
-- 
2.7.4