[PATCH 21/25] x86/MCE/AMD: Define function to get CS Fabric ID

[Yazen Ghannam]

From: Yazen Ghannam <yazen.ghannam@xxxxxxx>

Move code that gets the CS Fabric ID into a separate helper function.
This will be expanded for future DF versions.

Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>
---
 arch/x86/kernel/cpu/mce/amd.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index b017e4613d8f..6980c5c62f49 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -733,6 +733,7 @@ struct addr_ctx {
 	u8 intlv_num_dies;
 	u8 intlv_num_sockets;
 	u8 cs_id;
+	u8 cs_fabric_id;
 	bool hash_enabled;
 };
 
@@ -892,23 +893,34 @@ static void make_space_for_cs_id(struct addr_ctx *ctx)
 	}
 }
 
+static int get_cs_fabric_id(struct addr_ctx *ctx)
+{
+	u32 tmp;
+
+	if (amd_df_indirect_read(ctx->nid, df_regs[FAB_BLK_INST_INFO_3], ctx->umc, &tmp))
+		return -EINVAL;
+
+	ctx->cs_fabric_id = (tmp >> 8) & 0xFF;
+
+	return 0;
+}
+
 static int calculate_cs_id(struct addr_ctx *ctx)
 {
 	u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask;
-	u8 die_id_bit, sock_id_bit, cs_fabric_id, cs_mask = 0;
+	u8 die_id_bit, sock_id_bit, cs_mask = 0;
 	u32 tmp;
 
-	if (amd_df_indirect_read(ctx->nid, df_regs[FAB_BLK_INST_INFO_3], ctx->umc, &tmp))
+	if (get_cs_fabric_id(ctx))
 		return -EINVAL;
 
-	cs_fabric_id = (tmp >> 8) & 0xFF;
 	die_id_bit   = 0;
 
 	/* If interleaved over more than 1 channel: */
 	if (ctx->intlv_num_chan) {
 		die_id_bit = ctx->intlv_num_chan;
 		cs_mask	   = (1 << die_id_bit) - 1;
-		ctx->cs_id = cs_fabric_id & cs_mask;
+		ctx->cs_id = ctx->cs_fabric_id & cs_mask;
 	}
 
 	sock_id_bit = die_id_bit;
@@ -923,7 +935,7 @@ static int calculate_cs_id(struct addr_ctx *ctx)
 		die_id_shift = (tmp >> 24) & 0xF;
 		die_id_mask  = (tmp >> 8) & 0xFF;
 
-		ctx->cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
+		ctx->cs_id |= ((ctx->cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
 	}
 
 	/* If interleaved over more than 1 socket: */
@@ -931,7 +943,8 @@ static int calculate_cs_id(struct addr_ctx *ctx)
 		socket_id_shift	= (tmp >> 28) & 0xF;
 		socket_id_mask	= (tmp >> 16) & 0xFF;
 
-		ctx->cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit;
+		ctx->cs_id |= ((ctx->cs_fabric_id & socket_id_mask)
+				>> socket_id_shift) << sock_id_bit;
 	}
 
 	return 0;
-- 
2.25.1