linux-kernel - [PATCH 22/25] x86/MCE/AMD: Define function to find shift and mask values

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Date:   Fri,  7 May 2021 15:01:37 -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 22/25] x86/MCE/AMD: Define function to find shift and mask values

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

Move code to find the shift and mask values used in die and socket
interleaving into separate helper functions. These will be expanded for
future DF versions.

Also, move reading of the System Fabric ID Mask register into a helper
function and call this early. This will be expanded for future DF
versions and will be used to determine DF version levels.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/amd.c | 56 +++++++++++++++++++++++++++--------
 1 file changed, 43 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 6980c5c62f49..01931f98c6d9 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -725,6 +725,7 @@ struct addr_ctx {
 	u32 reg_dram_offset;
 	u32 reg_base_addr;
 	u32 reg_limit_addr;
+	u32 reg_fab_id_mask0;
 	u16 nid;
 	u8 umc;
 	u8 map_num;
@@ -734,6 +735,8 @@ struct addr_ctx {
 	u8 intlv_num_sockets;
 	u8 cs_id;
 	u8 cs_fabric_id;
+	u8 die_id_mask;
+	u8 socket_id_mask;
 	bool hash_enabled;
 };
 
@@ -905,15 +908,31 @@ static int get_cs_fabric_id(struct addr_ctx *ctx)
 	return 0;
 }
 
+static void get_masks(struct addr_ctx *ctx)
+{
+	ctx->die_id_mask    = (ctx->reg_fab_id_mask0 >> 8) & 0xFF;
+	ctx->socket_id_mask = (ctx->reg_fab_id_mask0 >> 16) & 0xFF;
+}
+
+static u8 get_die_id_shift(struct addr_ctx *ctx)
+{
+	return (ctx->reg_fab_id_mask0 >> 24) & 0xF;
+}
+
+static u8 get_socket_id_shift(struct addr_ctx *ctx)
+{
+	return (ctx->reg_fab_id_mask0 >> 28) & 0xF;
+}
+
 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_mask = 0;
-	u32 tmp;
 
 	if (get_cs_fabric_id(ctx))
 		return -EINVAL;
 
+	get_masks(ctx);
+
 	die_id_bit   = 0;
 
 	/* If interleaved over more than 1 channel: */
@@ -923,27 +942,26 @@ static int calculate_cs_id(struct addr_ctx *ctx)
 		ctx->cs_id = ctx->cs_fabric_id & cs_mask;
 	}
 
-	sock_id_bit = die_id_bit;
+	/* Return early if no die interleaving and no socket interleaving. */
+	if (!(ctx->intlv_num_dies || ctx->intlv_num_sockets))
+		return 0;
 
-	if (ctx->intlv_num_dies || ctx->intlv_num_sockets)
-		if (amd_df_indirect_read(ctx->nid, df_regs[SYS_FAB_ID_MASK], ctx->umc, &tmp))
-			return -EINVAL;
+	sock_id_bit = die_id_bit;
 
 	/* If interleaved over more than 1 die: */
 	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;
+		u8 die_id_shift = get_die_id_shift(ctx);
 
-		ctx->cs_id |= ((ctx->cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
+		sock_id_bit  = die_id_bit + ctx->intlv_num_dies;
+		ctx->cs_id |= ((ctx->cs_fabric_id & ctx->die_id_mask)
+				>> die_id_shift) << die_id_bit;
 	}
 
 	/* If interleaved over more than 1 socket: */
 	if (ctx->intlv_num_sockets) {
-		socket_id_shift	= (tmp >> 28) & 0xF;
-		socket_id_mask	= (tmp >> 16) & 0xFF;
+		u8 socket_id_shift = get_socket_id_shift(ctx);
 
-		ctx->cs_id |= ((ctx->cs_fabric_id & socket_id_mask)
+		ctx->cs_id |= ((ctx->cs_fabric_id & ctx->socket_id_mask)
 				>> socket_id_shift) << sock_id_bit;
 	}
 
@@ -1037,6 +1055,15 @@ static int addr_over_limit(struct addr_ctx *ctx)
 	return 0;
 }
 
+static int get_fabric_id_mask_reg(struct addr_ctx *ctx)
+{
+	if (amd_df_indirect_read(ctx->nid, df_regs[SYS_FAB_ID_MASK],
+				 ctx->umc, &ctx->reg_fab_id_mask0))
+		return -EINVAL;
+
+	return 0;
+}
+
 int umc_normaddr_to_sysaddr(u64 *addr, u16 nid, u8 umc)
 {
 	struct addr_ctx ctx;
@@ -1049,6 +1076,9 @@ int umc_normaddr_to_sysaddr(u64 *addr, u16 nid, u8 umc)
 	ctx.nid = nid;
 	ctx.umc = umc;
 
+	if (get_fabric_id_mask_reg(&ctx))
+		return -EINVAL;
+
 	ctx.df_type = get_df_type(&ctx);
 
 	if (remove_dram_offset(&ctx))
-- 
2.25.1