linux-kernel - [PATCH v2] EDAC/amd64: Add support for family 19h, models 40h-4fh

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Message-ID: <20251130102111.1180875-1-devangnayanbhai.vyas@amd.com>
Date: Sun, 30 Nov 2025 15:51:11 +0530
From: Devang Vyas <devangnayanbhai.vyas@....com>
To: <yazen.ghannam@....com>, <bp@...en8.de>, <tony.luck@...el.com>,
	<linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Devang Vyas <devangnayanbhai.vyas@....com>, Ramesh Garidapuri
	<ramesh.garidapuri@....com>
Subject: [PATCH v2] EDAC/amd64: Add support for family 19h, models 40h-4fh

Enable AMD EDAC driver for AMD SoC family 19h with
models 40h-4fh to support Ryzen 6000 CPUs/APUs
("Rembrandt"), which provides kernel-level
infrastructure needed for RAS (Reliability, Availability
and Serviceability) features.

Added changes enhance the ability to detect and
report memory errors on systems that utilize AMD SoCs
from the specified family. There are 4 memory controllers
supported by Rembrandt which enables proper error reporting
and RAS testing on specified AMD SoCs.

AMD EDAC linux driver interfaces directly with the hardware-
error reporting mechanism present in AMD platform, otherwise
these errors would not be surfaced through the standard Linux
EDAC framework and RAS validation workflows would be
incomplete.

Co-developed-by: Ramesh Garidapuri <ramesh.garidapuri@....com>
Signed-off-by: Ramesh Garidapuri <ramesh.garidapuri@....com>
Signed-off-by: Devang Vyas <devangnayanbhai.vyas@....com>
---

Changes since v1:
- Addressed review comment related to commit message which
  adds detailed information on why AMD EDAC driver is essential
  to load on AMD SoC.

 drivers/edac/amd64_edac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 2391f3469961..6cf0b6d7b5ec 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3863,6 +3863,9 @@ static int per_family_init(struct amd64_pvt *pvt)
 				pvt->max_mcs		= 8;
 			}
 			break;
+		case 0x40 ... 0x4f:
+			pvt->max_mcs			= 4;
+			break;
 		case 0x60 ... 0x6f:
 			pvt->flags.zn_regs_v2		= 1;
 			break;
-- 
2.25.1