linux-kernel - [PATCH 2/3] x86/MCE/AMD: Helper function to check UMC v2

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Date:   Tue, 11 May 2021 20:55:37 +0530
From:   Naveen Krishna Chatradhi <nchatrad@....com>
To:     linux-edac@...r.kernel.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, bp@...en8.de, mingo@...hat.com,
        mchehab@...nel.org, Mukul Joshi <mukul.joshi@....com>
Subject: [PATCH 2/3] x86/MCE/AMD: Helper function to check UMC v2

From: Mukul Joshi <mukul.joshi@....com>

Add a helper function to check if a given bank is
UMCv2 or not.

Signed-off-by: Mukul Joshi <mukul.joshi@....com>
Reviewed-by: John Clements <John.Clements@....com>
Reviewed-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/include/asm/mce.h    | 2 ++
 arch/x86/kernel/cpu/mce/amd.c | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index cf7f35fdf2c8..8cbe7221a253 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -357,6 +357,7 @@ extern int mce_threshold_remove_device(unsigned int cpu);
 
 void mce_amd_feature_init(struct cpuinfo_x86 *c);
 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr);
+bool is_smca_umc_v2(int bank);
 
 #else
 
@@ -366,6 +367,7 @@ static inline bool amd_mce_is_memory_error(struct mce *m)		{ return false; };
 static inline void mce_amd_feature_init(struct cpuinfo_x86 *c)		{ }
 static inline int
 umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)	{ return -EINVAL; };
+static inline bool is_smca_umc_v2(int bank)				{ return false;	};
 #endif
 
 static inline void mce_hygon_feature_init(struct cpuinfo_x86 *c)	{ return mce_amd_feature_init(c); }
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 055f3a0acf5e..41718e3111f2 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -1542,3 +1542,9 @@ int mce_threshold_create_device(unsigned int cpu)
 	mce_threshold_remove_device(cpu);
 	return err;
 }
+
+bool is_smca_umc_v2(int bank)
+{
+	return (smca_get_bank_type(bank) == SMCA_UMC_V2);
+}
+EXPORT_SYMBOL_GPL(is_smca_umc_v2);
-- 
2.17.1