linux-kernel - [PATCH v2 1/2] EDAC/amd64: Check register values from all UMCs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 15 Dec 2021 15:53:08 +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>,
        <william.roche@...cle.com>, "Yazen Ghannam" <yazen.ghannam@....com>
Subject: [PATCH v2 1/2] EDAC/amd64: Check register values from all UMCs

The initial support for Unified Memory Controllers (UMCs) was added to
AMD64 EDAC for the first generation of Zen systems. These systems have
two UMCs per Die, and the code originally assumed two UMCs in various
places.

Later systems have more than two UMCs, and this assumption was fixed in
the following commits.

commit bdcee7747f5c ("EDAC/amd64: Support more than two Unified Memory Controllers")
commit d971e28e2ce4 ("EDAC/amd64: Support more than two controllers for chip selects handling")

However, the determine_memory_type() function was missed in these
changes, and two UMCs are still assumed.

Update determine_memory_type() to account for all UMCs when checking the
register values.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lkml.kernel.org/r/20211208174356.1997855-4-yazen.ghannam@amd.com

v1->v2:
* Was patch 3 in v1.
* Update commit message.

 drivers/edac/amd64_edac.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index ff29267e46a6..1df763128483 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1621,9 +1621,16 @@ static void determine_memory_type(struct amd64_pvt *pvt)
 	u32 dram_ctrl, dcsm;
 
 	if (pvt->umc) {
-		if ((pvt->umc[0].dimm_cfg | pvt->umc[1].dimm_cfg) & BIT(5))
+		u32 umc_cfg = 0, dimm_cfg = 0, i = 0;
+
+		for_each_umc(i) {
+			umc_cfg  |= pvt->umc[i].umc_cfg;
+			dimm_cfg |= pvt->umc[i].dimm_cfg;
+		}
+
+		if (dimm_cfg & BIT(5))
 			pvt->dram_type = MEM_LRDDR4;
-		else if ((pvt->umc[0].dimm_cfg | pvt->umc[1].dimm_cfg) & BIT(4))
+		else if (dimm_cfg & BIT(4))
 			pvt->dram_type = MEM_RDDR4;
 		else
 			pvt->dram_type = MEM_DDR4;
-- 
2.25.1