linux-kernel - [PATCH] EDAC/amd64: Correct number of UMCs for Family 19h Models 70h-7fh

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Message-ID: <20250613005233.2330627-1-avadhut.naik@amd.com>
Date: Fri, 13 Jun 2025 00:51:35 +0000
From: Avadhut Naik <avadhut.naik@....com>
To: <linux-edac@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <bp@...en8.de>, <yazen.ghannam@....com>,
	<mario.limonciello@....com>, <avadhut.naik@....com>, reox
	<mailinglist@...x.at>
Subject: [PATCH] EDAC/amd64: Correct number of UMCs for Family 19h Models 70h-7fh

AMD's Family 19h-based Models 70h-7fh support 4 UMCs per processor die.

The amd64_edac module, however, assumes only 2 UMCs are supported since
max_mcs variable for the models has not been explicitly set to 4. The
same results in incomplete or incorrect memory information being logged
to dmesg by the module during initialization in some instances.

Fixes: 6c79e42169fe ("EDAC/amd64: Add support for ECC on family 19h model 60h-7Fh")
Reported-by: reox <mailinglist@...x.at>
Closes: https://lore.kernel.org/all/27dc093f-ce27-4c71-9e81-786150a040b6@reox.at/
Signed-off-by: Avadhut Naik <avadhut.naik@....com>
Cc: stable@...nel.org
---
 drivers/edac/amd64_edac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 90f0eb7cc5b9..390f5756b66e 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3879,6 +3879,7 @@ static int per_family_init(struct amd64_pvt *pvt)
 			break;
 		case 0x70 ... 0x7f:
 			pvt->ctl_name			= "F19h_M70h";
+			pvt->max_mcs			= 4;
 			pvt->flags.zn_regs_v2		= 1;
 			break;
 		case 0x90 ... 0x9f:

base-commit: 855b5de2e562c07d6cda4deb08d09dc2e0e2b18d
-- 
2.43.0