linux-kernel - [PATCH v4 03/24] EDAC/amd64: Define function to read DRAM address map registers

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Date:   Thu, 27 Jan 2022 20:40:54 +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 03/24] EDAC/amd64: Define function to read DRAM address map registers

Move the reading of the base and limit registers into a helper function.
Save the raw values in the context struct as they will be parsed later.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lore.kernel.org/r/20211028175728.121452-8-yazen.ghannam@amd.com

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

v2->v3:
* Was patch 8 in v2.
* Dropped "df_regs" use.

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

 drivers/edac/amd64_edac.c | 51 ++++++++++++++++++++++++---------------
 1 file changed, 32 insertions(+), 19 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 837bca7eb1ff..d1af1ce716f9 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1062,6 +1062,8 @@ struct addr_ctx {
 	u64 ret_addr;
 	u32 tmp;
 	u32 reg_dram_offset;
+	u32 reg_base_addr;
+	u32 reg_limit_addr;
 	u16 nid;
 	u8 inst_id;
 	u8 map_num;
@@ -1113,6 +1115,27 @@ static int remove_dram_offset(struct addr_ctx *ctx)
 	return 0;
 }
 
+static int get_dram_addr_map(struct addr_ctx *ctx)
+{
+	/* Read D18F0x110 (DramBaseAddress). */
+	if (df_indirect_read_instance(ctx->nid, 0, 0x110 + (8 * ctx->map_num),
+				      ctx->inst_id, &ctx->reg_base_addr))
+		return -EINVAL;
+
+	/* Check if address range is valid. */
+	if (!(ctx->reg_base_addr & BIT(0))) {
+		pr_debug("Invalid DramBaseAddress range: 0x%x.\n", ctx->reg_base_addr);
+		return -EINVAL;
+	}
+
+	/* Read D18F0x114 (DramLimitAddress). */
+	if (df_indirect_read_instance(ctx->nid, 0, 0x114 + (8 * ctx->map_num),
+				      ctx->inst_id, &ctx->reg_limit_addr))
+		return -EINVAL;
+
+	return 0;
+}
+
 static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 {
 	u64 dram_base_addr, dram_limit_addr, dram_hole_base;
@@ -1145,21 +1168,15 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
 		goto out_err;
 	}
 
-	/* Read D18F0x110 (DramBaseAddress). */
-	if (df_indirect_read_instance(nid, 0, 0x110 + (8 * ctx.map_num), umc, &ctx.tmp))
-		goto out_err;
-
-	/* Check if address range is valid. */
-	if (!(ctx.tmp & BIT(0))) {
-		pr_err("%s: Invalid DramBaseAddress range: 0x%x.\n",
-			__func__, ctx.tmp);
+	if (get_dram_addr_map(&ctx)) {
+		pr_debug("Failed to get DRAM address map");
 		goto out_err;
 	}
 
-	lgcy_mmio_hole_en = ctx.tmp & BIT(1);
-	intlv_num_chan	  = (ctx.tmp >> 4) & 0xF;
-	intlv_addr_sel	  = (ctx.tmp >> 8) & 0x7;
-	dram_base_addr	  = (ctx.tmp & GENMASK_ULL(31, 12)) << 16;
+	lgcy_mmio_hole_en = ctx.reg_base_addr & BIT(1);
+	intlv_num_chan	  = (ctx.reg_base_addr >> 4) & 0xF;
+	intlv_addr_sel	  = (ctx.reg_base_addr >> 8) & 0x7;
+	dram_base_addr	  = (ctx.reg_base_addr & GENMASK_ULL(31, 12)) << 16;
 
 	/* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */
 	if (intlv_addr_sel > 3) {
@@ -1168,13 +1185,9 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
 		goto out_err;
 	}
 
-	/* Read D18F0x114 (DramLimitAddress). */
-	if (df_indirect_read_instance(nid, 0, 0x114 + (8 * ctx.map_num), umc, &ctx.tmp))
-		goto out_err;
-
-	intlv_num_sockets = (ctx.tmp >> 8) & 0x1;
-	intlv_num_dies	  = (ctx.tmp >> 10) & 0x3;
-	dram_limit_addr	  = ((ctx.tmp & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
+	intlv_num_sockets = (ctx.reg_limit_addr >> 8) & 0x1;
+	intlv_num_dies	  = (ctx.reg_limit_addr >> 10) & 0x3;
+	dram_limit_addr	  = ((ctx.reg_limit_addr & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
 
 	intlv_addr_bit = intlv_addr_sel + 8;
 
-- 
2.25.1