linux-kernel - [PATCH 4.14 21/49] x86/MCE/AMD: Define a function to get SMCA bank type

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Date:   Tue, 17 Apr 2018 17:59:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yazen Ghannam <yazen.ghannam@....com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 4.14 21/49] x86/MCE/AMD: Define a function to get SMCA bank type

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 11cf887728a3d1de77cc12ce247b64ef32608891 upstream.

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 (Unified Memory Controller) then we will need to
convert its address from a normalized address to a system physical
address before handling the error.

[ bp: Verify m->bank is within range and use bank pointer. ]

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20171207203955.118171-1-Yazen.Ghannam@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/cpu/mcheck/mce_amd.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -110,6 +110,20 @@ const char *smca_get_long_name(enum smca
 }
 EXPORT_SYMBOL_GPL(smca_get_long_name);
 
+static enum smca_bank_types smca_get_bank_type(struct mce *m)
+{
+	struct smca_bank *b;
+
+	if (m->bank >= N_SMCA_BANK_TYPES)
+		return N_SMCA_BANK_TYPES;
+
+	b = &smca_banks[m->bank];
+	if (!b->hwid)
+		return N_SMCA_BANK_TYPES;
+
+	return b->hwid->bank_type;
+}
+
 static struct smca_hwid smca_hwid_mcatypes[] = {
 	/* { bank_type, hwid_mcatype, xec_bitmap } */