linux-kernel - [PATCH v2 24/31] EDAC/amd64: Define function to insert CS ID into address

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Date:   Wed, 23 Jun 2021 19:19:55 +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, Smita.KoralahalliChannabasappa@....com,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v2 24/31] EDAC/amd64: Define function to insert CS ID into address

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

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lkml.kernel.org/r/20210507190140.18854-21-Yazen.Ghannam@amd.com

v1->v2:
* Moved from arch/x86 to EDAC.
* Added function pointer to ctx struct.

 drivers/edac/amd64_edac.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 0270bf4f1f90..d09a17747abd 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1103,6 +1103,7 @@ struct addr_ctx {
 	u8 cs_id;
 	int (*dehash_addr)(struct addr_ctx *ctx);
 	void (*make_space_for_cs_id)(struct addr_ctx *ctx);
+	void (*insert_cs_id)(struct addr_ctx *ctx);
 };
 
 struct data_fabric_ops {
@@ -1135,6 +1136,11 @@ static void make_space_for_cs_id_simple(struct addr_ctx *ctx)
 	expand_bits(ctx->intlv_addr_bit, num_intlv_bits, &ctx->ret_addr);
 }
 
+static void insert_cs_id_simple(struct addr_ctx *ctx)
+{
+	ctx->ret_addr |= (ctx->cs_id << ctx->intlv_addr_bit);
+}
+
 static u64 get_hi_addr_offset_df2(struct addr_ctx *ctx)
 {
 	return (ctx->reg_dram_offset & GENMASK_ULL(31, 20)) << 8;
@@ -1166,6 +1172,7 @@ static int get_intlv_mode_df2(struct addr_ctx *ctx)
 	}
 
 	ctx->make_space_for_cs_id = &make_space_for_cs_id_simple;
+	ctx->insert_cs_id = &insert_cs_id_simple;
 
 	if (ctx->intlv_mode != NONE &&
 	    ctx->intlv_mode != NOHASH_2CH &&
@@ -1333,8 +1340,6 @@ static int calculate_cs_id(struct addr_ctx *ctx)
 
 static int denormalize_addr(struct addr_ctx *ctx)
 {
-	u8 num_intlv_bits;
-
 	/* Return early if no interleaving. */
 	if (ctx->intlv_mode == NONE)
 		return 0;
@@ -1351,20 +1356,7 @@ static int denormalize_addr(struct addr_ctx *ctx)
 	if (calculate_cs_id(ctx))
 		return -EINVAL;
 
-	if (num_intlv_bits > 0) {
-		u64 temp_addr_i;
-
-		/*
-		 * The pre-interleaved address consists of XXXXXXIIIYYYYY
-		 * where III is the ID for this CS, and XXXXXXYYYYY are the
-		 * address bits from the post-interleaved address.
-		 * "num_intlv_bits" has been calculated to tell us how many "I"
-		 * bits there are. "intlv_addr_bit" tells us how many "Y" bits
-		 * there are (where "I" starts).
-		 */
-		temp_addr_i = (ctx->cs_id << ctx->intlv_addr_bit);
-		ctx->ret_addr |= temp_addr_i;
-	}
+	ctx->insert_cs_id(ctx);
 
 	return 0;
 }
-- 
2.25.1