[PATCH v7 12/12] EDAC/amd64: Add fixed UMC to CS mapping

[Naveen Krishna Chatradhi <nchatrad@amd.com>]

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

GPU memory address mapping entries in Aldebaran will enable on which
channel the error occurred.

Aldebaran has 2 dies and are enumerated alternatively
 * die0's are enumerated as node 2, 4, 6 and 8
 * die1's are enumerated as node 1, 3, 5 and 7

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Naveen Krishna Chatradhi <nchatrad@amd.com>
---
Link:
v3->v7:
* Split and fixed UMC to CS mapping from patch 33 in v3.
  https://patchwork.kernel.org/project/linux-edac/patch/20211028175728.121452-34-yazen.ghannam@amd.com/

 drivers/edac/amd64_edac.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 6e0d617fd95f..e0f9f3a4fff8 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1540,6 +1540,36 @@ static u16 get_dst_fabric_id_df35(struct addr_ctx *ctx)
 	return ctx->reg_limit_addr & 0xFFF;
 }
 
+/* UMC to CS mapping for Aldebaran die[0]s */
+u8 umc_to_cs_mapping_aldebaran_die0[] = { 28, 20, 24, 16, 12, 4, 8, 0,
+					 6, 30, 2, 26, 22, 14, 18, 10,
+					 19, 11, 15, 7, 3, 27, 31, 23,
+					 9, 1, 5, 29, 25, 17, 21, 13};
+
+/* UMC to CS mapping for Aldebaran die[1]s */
+u8 umc_to_cs_mapping_aldebaran_die1[] = { 19, 11, 15, 7, 3, 27, 31, 23,
+					9, 1, 5, 29, 25, 17, 21, 13,
+					28, 20, 24, 16, 12, 4, 8, 0,
+					6, 30, 2, 26, 22, 14, 18, 10};
+
+int get_umc_to_cs_mapping(struct addr_ctx *ctx)
+{
+	if (ctx->inst_id >= sizeof(umc_to_cs_mapping_aldebaran_die0))
+		return -EINVAL;
+
+	/*
+	 * Aldebaran has 2 dies and are enumerated alternatively
+	 * die0's are enumerated as node 2, 4, 6 and 8
+	 * die1's are enumerated as node 1, 3, 5 and 7
+	 */
+	if (ctx->nid % 2)
+		ctx->inst_id = umc_to_cs_mapping_aldebaran_die1[ctx->inst_id];
+	else
+		ctx->inst_id = umc_to_cs_mapping_aldebaran_die0[ctx->inst_id];
+
+	return 0;
+}
+
 static int get_cs_fabric_id_df35(struct addr_ctx *ctx)
 {
 	u16 nid = ctx->nid;
-- 
2.25.1