linux-kernel - [PATCH v3 18/33] EDAC/amd64: Define function to get number of interleaved dies

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Date:   Thu, 28 Oct 2021 17:57:13 +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>,
        <NaveenKrishna.Chatradhi@....com>, <Muralidhara.MK@....com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v3 18/33] EDAC/amd64: Define function to get number of interleaved dies

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>
---
Link:
https://lkml.kernel.org/r/20210623192002.3671647-20-yazen.ghannam@amd.com

v2->v3:
* Was patch 19 in v2.

v1->v2:
* Moved from arch/x86 to EDAC.
* Add new function to data_fabric_ops.

 drivers/edac/amd64_edac.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 11a54e7a0432..e76aa8ee906a 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1069,6 +1069,7 @@ struct addr_ctx {
 	u8 map_num;
 	u8 intlv_addr_bit;
 	u8 intlv_num_chan;
+	u8 intlv_num_dies;
 	u8 cs_id;
 	int (*dehash_addr)(struct addr_ctx *ctx);
 };
@@ -1076,6 +1077,7 @@ struct addr_ctx {
 struct data_fabric_ops {
 	u64	(*get_hi_addr_offset)		(struct addr_ctx *ctx);
 	int	(*get_intlv_mode)		(struct addr_ctx *ctx);
+	void	(*get_intlv_num_dies)		(struct addr_ctx *ctx);
 };
 
 static u64 get_hi_addr_offset_df2(struct addr_ctx *ctx)
@@ -1116,9 +1118,15 @@ static int get_intlv_mode_df2(struct addr_ctx *ctx)
 	return 0;
 }
 
+static void get_intlv_num_dies_df2(struct addr_ctx *ctx)
+{
+	ctx->intlv_num_dies  = (ctx->reg_limit_addr >> 10) & 0x3;
+}
+
 struct data_fabric_ops df2_ops = {
 	.get_hi_addr_offset		=	get_hi_addr_offset_df2,
 	.get_intlv_mode			=	get_intlv_mode_df2,
+	.get_intlv_num_dies		=	get_intlv_num_dies_df2,
 };
 
 struct data_fabric_ops *df_ops;
@@ -1208,7 +1216,7 @@ static void get_intlv_num_chan(struct addr_ctx *ctx)
 static int denormalize_addr(struct addr_ctx *ctx)
 {
 	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. */
@@ -1219,19 +1227,12 @@ 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);
+	df_ops->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;
@@ -1269,13 +1270,13 @@ static int denormalize_addr(struct addr_ctx *ctx)
 		sock_id_bit = die_id_bit;
 
 		/* Read D18F1x208 (SystemFabricIdMask). */
-		if (intlv_num_dies || intlv_num_sockets)
+		if (ctx->intlv_num_dies || intlv_num_sockets)
 			if (df_indirect_read_broadcast(ctx->nid, 1, 0x208, &ctx->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 = (ctx->tmp >> 24) & 0xF;
 			die_id_mask  = (ctx->tmp >> 8) & 0xFF;
 
-- 
2.25.1