linux-kernel - [PATCH v4 06/24] EDAC/amd64: Define function to add DRAM base and hole

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Date:   Thu, 27 Jan 2022 20:40:57 +0000
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     <linux-edac@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <bp@...en8.de>,
        <mchehab@...nel.org>, <tony.luck@...el.com>, <james.morse@....com>,
        <rric@...nel.org>, <Smita.KoralahalliChannabasappa@....com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v4 06/24] EDAC/amd64: Define function to add DRAM base and hole

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

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lore.kernel.org/r/20211028175728.121452-11-yazen.ghannam@amd.com

v3->v4:
* Include pr_debug() on failure.

v2->v3:
* Was patch 11 in v2.

v1->v2:
* Moved from arch/x86 to EDAC.

 drivers/edac/amd64_edac.c | 43 +++++++++++++++++++++++----------------
 1 file changed, 26 insertions(+), 17 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 9c61e3fa231a..350204eadb27 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1288,12 +1288,32 @@ static int denormalize_addr(struct addr_ctx *ctx)
 	return 0;
 }
 
-static 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;
+
+	/* 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 (df_indirect_read_broadcast(ctx->nid, 0, 0x104, &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;
+}
 
+static 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;
 
@@ -1330,22 +1350,11 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
 		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 (df_indirect_read_broadcast(nid, 0, 0x104, &ctx.tmp))
-			goto out_err;
-
-		dram_hole_base = ctx.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)) {
+		pr_debug("Failed to add DRAM base address and hole");
+		goto out_err;
 	}
 
 	if (ctx.hash_enabled) {
-- 
2.25.1