linux-kernel - [PATCH 07/25] x86/MCE/AMD: Define function to add DRAM base and hole

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Date:   Fri,  7 May 2021 15:01:22 -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 07/25] x86/MCE/AMD: Define function to add DRAM base and hole

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

Move adding of DRAM base and hole into a separate helper function.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/amd.c | 45 ++++++++++++++++++++---------------
 1 file changed, 26 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 263d419d4175..d1a6405bb990 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -938,14 +938,34 @@ static int denormalize_addr(struct addr_ctx *ctx)
 	return 0;
 }
 
-int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+static int add_base_and_hole(struct addr_ctx *ctx)
 {
-	u64 dram_base_addr, dram_limit_addr, dram_hole_base;
+	u64 dram_base_addr = (ctx->reg_base_addr & GENMASK_ULL(31, 12)) << 16;
 
-	u32 tmp;
+	/* Add dram base address */
+	ctx->ret_addr += dram_base_addr;
+
+	/* If legacy MMIO hole enabled */
+	if (ctx->reg_base_addr & BIT(1)) {
+		u32 dram_hole_base;
+
+		if (amd_df_indirect_read(ctx->nid, df_regs[DRAM_HOLE_CTL],
+					 ctx->umc, &dram_hole_base))
+			return -EINVAL;
+
+		dram_hole_base &= GENMASK(31, 24);
+		if (ctx->ret_addr >= dram_hole_base)
+			ctx->ret_addr += (BIT_ULL(32) - dram_hole_base);
+	}
+
+	return 0;
+}
+
+int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+{
+	u64 dram_limit_addr;
 
 	u8 hashed_bit;
-	u8 lgcy_mmio_hole_en;
 
 	struct addr_ctx ctx;
 
@@ -971,23 +991,10 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 	if (denormalize_addr(&ctx))
 		goto out_err;
 
-	lgcy_mmio_hole_en = ctx.reg_base_addr & BIT(1);
-	dram_base_addr	  = (ctx.reg_base_addr & GENMASK_ULL(31, 12)) << 16;
-
 	dram_limit_addr	  = ((ctx.reg_limit_addr & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
 
-	/* Add dram base address */
-	ctx.ret_addr += dram_base_addr;
-
-	/* If legacy MMIO hole enabled */
-	if (lgcy_mmio_hole_en) {
-		if (amd_df_indirect_read(nid, df_regs[DRAM_HOLE_CTL], umc, &tmp))
-			goto out_err;
-
-		dram_hole_base = tmp & GENMASK(31, 24);
-		if (ctx.ret_addr >= dram_hole_base)
-			ctx.ret_addr += (BIT_ULL(32) - dram_hole_base);
-	}
+	if (add_base_and_hole(&ctx))
+		goto out_err;
 
 	if (ctx.hash_enabled) {
 		/* Save some parentheses and grab ls-bit at the end. */
-- 
2.25.1