linux-kernel - [PATCH 15/25] x86/MCE/AMD: Define function to get number of interleaved dies

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Date:   Fri,  7 May 2021 15:01:30 -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 15/25] x86/MCE/AMD: Define function to get number of interleaved dies

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

Move parsing of the number of interleaved dies to a separate helper
function. This will be expanded for future DF versions. Also, drop an
unneeded assert to match the reference code.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/amd.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 0c24bdc346a3..de59fa6cf540 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -730,6 +730,7 @@ struct addr_ctx {
 	u8 map_num;
 	u8 intlv_addr_bit;
 	u8 intlv_num_chan;
+	u8 intlv_num_dies;
 	u8 cs_id;
 	bool hash_enabled;
 };
@@ -848,12 +849,17 @@ static void get_intlv_num_chan(struct addr_ctx *ctx)
 	}
 }
 
+static void get_intlv_num_dies(struct addr_ctx *ctx)
+{
+	ctx->intlv_num_dies  = (ctx->reg_limit_addr >> 10) & 0x3;
+}
+
 static int denormalize_addr(struct addr_ctx *ctx)
 {
 	u32 tmp;
 
 	u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask;
-	u8 intlv_num_dies, intlv_num_sockets;
+	u8 intlv_num_sockets;
 	u8 num_intlv_bits, cs_mask = 0;
 
 	/* Return early if no interleaving. */
@@ -864,19 +870,12 @@ static int denormalize_addr(struct addr_ctx *ctx)
 		return -EINVAL;
 
 	intlv_num_sockets = (ctx->reg_limit_addr >> 8) & 0x1;
-	intlv_num_dies	  = (ctx->reg_limit_addr >> 10) & 0x3;
 
 	get_intlv_num_chan(ctx);
+	get_intlv_num_dies(ctx);
 
 	num_intlv_bits = ctx->intlv_num_chan;
-
-	if (intlv_num_dies > 2) {
-		pr_err("%s: Invalid number of interleaved nodes/dies %d.\n",
-			__func__, intlv_num_dies);
-		return -EINVAL;
-	}
-
-	num_intlv_bits += intlv_num_dies;
+	num_intlv_bits += ctx->intlv_num_dies;
 
 	/* Add a bit if sockets are interleaved. */
 	num_intlv_bits += intlv_num_sockets;
@@ -913,14 +912,14 @@ static int denormalize_addr(struct addr_ctx *ctx)
 
 		sock_id_bit = die_id_bit;
 
-		if (intlv_num_dies || intlv_num_sockets)
+		if (ctx->intlv_num_dies || intlv_num_sockets)
 			if (amd_df_indirect_read(ctx->nid, df_regs[SYS_FAB_ID_MASK],
 						 ctx->umc, &tmp))
 				return -EINVAL;
 
 		/* If interleaved over more than 1 die. */
-		if (intlv_num_dies) {
-			sock_id_bit  = die_id_bit + intlv_num_dies;
+		if (ctx->intlv_num_dies) {
+			sock_id_bit  = die_id_bit + ctx->intlv_num_dies;
 			die_id_shift = (tmp >> 24) & 0xF;
 			die_id_mask  = (tmp >> 8) & 0xFF;
 
-- 
2.25.1