linux-kernel - [PATCH 1/2] x86/mce/AMD: Define function to get SMCA bank type

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Date:   Fri,  1 Dec 2017 09:50:33 -0600
From:   Yazen Ghannam <Yazen.Ghannam@....com>
To:     linux-edac@...r.kernel.org
Cc:     Yazen Ghannam <yazen.ghannam@....com>,
        Borislav Petkov <bp@...e.de>, Tony Luck <tony.luck@...el.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] x86/mce/AMD: Define function to get SMCA bank type

From: Yazen Ghannam <yazen.ghannam@....com>

Scalable MCA systems have various types of banks. The bank's type can
determine how we handle errors from it. For example, if a bank represents
a UMC then we will need to convert its address from a normalized address
to a system physical address before handling the error.

Define an exported function to return a bank's SMCA type.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/include/asm/mce.h           |  1 +
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index b1e8d8db921f..9ab8bf32e61c 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -376,6 +376,7 @@ struct smca_bank {
 extern struct smca_bank smca_banks[MAX_NR_BANKS];
 
 extern const char *smca_get_long_name(enum smca_bank_types t);
+extern unsigned int smca_get_bank_type(struct mce *m);
 
 extern int mce_threshold_create_device(unsigned int cpu);
 extern int mce_threshold_remove_device(unsigned int cpu);
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index a38ab1fa53a2..bc0510a4f6c0 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -110,6 +110,17 @@ const char *smca_get_long_name(enum smca_bank_types t)
 }
 EXPORT_SYMBOL_GPL(smca_get_long_name);
 
+unsigned int smca_get_bank_type(struct mce *m)
+{
+	struct smca_bank bank = smca_banks[m->bank];
+
+	if (!bank.hwid)
+		return N_SMCA_BANK_TYPES;
+
+	return bank.hwid->bank_type;
+}
+EXPORT_SYMBOL_GPL(smca_get_bank_type);
+
 static struct smca_hwid smca_hwid_mcatypes[] = {
 	/* { bank_type, hwid_mcatype, xec_bitmap } */
 
-- 
2.14.1