linux-kernel - [PATCH v2 4/4] x86/MCE/AMD: Carve out SMCA get_block

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Date:   Thu, 15 Feb 2018 15:09:43 -0600
From:   Yazen Ghannam <Yazen.Ghannam@....com>
To:     linux-edac@...r.kernel.org
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>,
        linux-kernel@...r.kernel.org, bp@...e.de, tony.luck@...el.com,
        x86@...nel.org
Subject: [PATCH v2 4/4] x86/MCE/AMD: Carve out SMCA get_block_address() code

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

Carve out the SMCA code in get_block_address() into a separate helper
function.

No functional change.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
v1->v2:
* New in this series.

 arch/x86/kernel/cpu/mcheck/mce_amd.c | 59 ++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 26 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 12bc2863a4d6..7c451850d8aa 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -431,6 +431,37 @@ static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
 	wrmsr(MSR_CU_DEF_ERR, low, high);
 }
 
+static u32 smca_get_block_address(unsigned int cpu, unsigned int bank,
+				  unsigned int block)
+{
+	u32 addr = 0;
+
+	if (smca_get_bank_type(bank) == SMCA_RESERVED)
+		return addr;
+
+	if (!block) {
+		addr = MSR_AMD64_SMCA_MCx_MISC(bank);
+	} else {
+		/*
+		 * For SMCA enabled processors, BLKPTR field of the
+		 * first MISC register (MCx_MISC0) indicates presence of
+		 * additional MISC register set (MISC1-4).
+		 */
+		u32 low, high;
+
+		if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
+			return addr;
+
+		if (!(low & MCI_CONFIG_MCAX))
+			return addr;
+
+		if (!rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
+		    (low & MASK_BLKPTR_LO))
+			addr = MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
+	}
+	return addr;
+}
+
 static u32 get_block_address(unsigned int cpu, u32 current_addr, u32 low, u32 high,
 			     unsigned int bank, unsigned int block)
 {
@@ -451,32 +482,8 @@ static u32 get_block_address(unsigned int cpu, u32 current_addr, u32 low, u32 hi
 		}
 	}
 
-	if (mce_flags.smca) {
-		if (smca_get_bank_type(bank) == SMCA_RESERVED)
-			return addr;
-
-		if (!block) {
-			addr = MSR_AMD64_SMCA_MCx_MISC(bank);
-		} else {
-			/*
-			 * For SMCA enabled processors, BLKPTR field of the
-			 * first MISC register (MCx_MISC0) indicates presence of
-			 * additional MISC register set (MISC1-4).
-			 */
-			u32 low, high;
-
-			if (rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
-				return addr;
-
-			if (!(low & MCI_CONFIG_MCAX))
-				return addr;
-
-			if (!rdmsr_safe_on_cpu(cpu, MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high) &&
-			    (low & MASK_BLKPTR_LO))
-				addr = MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
-		}
-		return addr;
-	}
+	if (mce_flags.smca)
+		return smca_get_block_address(cpu, bank, block);
 
 	/* Fall back to method we used for older processors: */
 	switch (block) {
-- 
2.14.1