linux-kernel - [PATCH 09/25] x86/MCE/AMD: Define function to check DRAM limit address

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Date:   Fri,  7 May 2021 15:01:24 -0400
From:   Yazen Ghannam <Yazen.Ghannam@....com>
To:     linux-edac@...r.kernel.org
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>,
        linux-kernel@...r.kernel.org, tony.luck@...el.com, x86@...nel.org,
        Smita.KoralahalliChannabasappa@....com
Subject: [PATCH 09/25] x86/MCE/AMD: Define function to check DRAM limit address

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

Move the DRAM limit check into a separate helper function.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/amd.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index e341737e03d4..7aaf8a1dce2b 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -985,10 +985,20 @@ static int dehash_addr(struct addr_ctx *ctx)
 	return dehash_addr_df2(ctx);
 }
 
-int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+static int addr_over_limit(struct addr_ctx *ctx)
 {
-	u64 dram_limit_addr;
+	u64 dram_limit_addr  = ((ctx->reg_limit_addr & GENMASK_ULL(31, 12)) << 16)
+					| GENMASK_ULL(27, 0);
+
+	/* Is calculated system address above DRAM limit address? */
+	if (ctx->ret_addr > dram_limit_addr)
+		return -EINVAL;
 
+	return 0;
+}
+
+int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+{
 	struct addr_ctx ctx;
 
 	memset(&ctx, 0, sizeof(ctx));
@@ -1013,16 +1023,13 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 	if (denormalize_addr(&ctx))
 		goto out_err;
 
-	dram_limit_addr	  = ((ctx.reg_limit_addr & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
-
 	if (add_base_and_hole(&ctx))
 		goto out_err;
 
 	if (dehash_addr(&ctx))
 		goto out_err;
 
-	/* Is calculated system address is above DRAM limit address? */
-	if (ctx.ret_addr > dram_limit_addr)
+	if (addr_over_limit(&ctx))
 		goto out_err;
 
 	*sys_addr = ctx.ret_addr;
-- 
2.25.1