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From: "Ghannam, Yazen" <Yazen.Ghannam@amd.com>
To: "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>
Cc: "Ghannam, Yazen" <Yazen.Ghannam@amd.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"bp@alien8.de" <bp@alien8.de>
Subject: [PATCH v3 5/8] EDAC/amd64: Decode syndrome before translating address
Date: Thu, 22 Aug 2019 00:00:00 +0000
Message-ID: <20190821235938.118710-6-Yazen.Ghannam@amd.com> (raw)
In-Reply-To: <20190821235938.118710-1-Yazen.Ghannam@amd.com>

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

AMD Family 17h systems currently require address translation in order to
report the system address of a DRAM ECC error. This is currently done
before decoding the syndrome information. The syndrome information does
not depend on the address translation, so the proper EDAC csrow/channel
reporting can function without the address. However, the syndrome
information will not be decoded if the address translation fails.

Decode the syndrome information before doing the address translation.
The syndrome information is architecturally defined in MCA_SYND and can
be considered robust. The address translation is system-specific and may
fail on newer systems without proper updates to the translation
algorithm.

Fixes: 713ad54675fd ("EDAC, amd64: Define and register UMC error decode function")
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:
https://lkml.kernel.org/r/20190709215643.171078-6-Yazen.Ghannam@amd.com

v2->v3:
* No change.

v1->v2:
* No change.

 drivers/edac/amd64_edac.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index c4f2d7c59b04..de141de7b2e5 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2574,13 +2574,6 @@ static void decode_umc_error(int node_id, struct mce *m)
 
 	err.channel = find_umc_channel(m);
 
-	if (umc_normaddr_to_sysaddr(m->addr, pvt->mc_node_id, err.channel, &sys_addr)) {
-		err.err_code = ERR_NORM_ADDR;
-		goto log_error;
-	}
-
-	error_address_to_page_and_offset(sys_addr, &err);
-
 	if (!(m->status & MCI_STATUS_SYNDV)) {
 		err.err_code = ERR_SYND;
 		goto log_error;
@@ -2597,6 +2590,13 @@ static void decode_umc_error(int node_id, struct mce *m)
 
 	err.csrow = m->synd & 0x7;
 
+	if (umc_normaddr_to_sysaddr(m->addr, pvt->mc_node_id, err.channel, &sys_addr)) {
+		err.err_code = ERR_NORM_ADDR;
+		goto log_error;
+	}
+
+	error_address_to_page_and_offset(sys_addr, &err);
+
 log_error:
 	__log_ecc_error(mci, &err, ecc_type);
 }
-- 
2.17.1


  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-21 23:59 [PATCH v3 0/8] AMD64 EDAC fixes Ghannam, Yazen
2019-08-21 23:59 ` [PATCH v3 1/8] EDAC/amd64: Support more than two controllers for chip selects handling Ghannam, Yazen
2019-08-21 23:59 ` [PATCH v3 2/8] EDAC/amd64: Recognize DRAM device type with EDAC_CTL_CAP Ghannam, Yazen
2019-08-21 23:59 ` [PATCH v3 3/8] EDAC/amd64: Initialize DIMM info for systems with more than two channels Ghannam, Yazen
2019-08-21 23:59 ` [PATCH v3 4/8] EDAC/amd64: Find Chip Select memory size using Address Mask Ghannam, Yazen
2019-08-22  0:00 ` Ghannam, Yazen [this message]
2019-08-22  0:00 ` [PATCH v3 6/8] EDAC/amd64: Cache secondary Chip Select registers Ghannam, Yazen
2019-08-22  0:00 ` [RFC PATCH v3 08/10] EDAC/amd64: Gather hardware information early Ghannam, Yazen
2019-08-29  9:22   ` Borislav Petkov
2019-09-06 19:14     ` Ghannam, Yazen
2019-09-06 20:35       ` Borislav Petkov
2019-09-06 20:49         ` Ghannam, Yazen
2019-09-09 15:31           ` Borislav Petkov
2019-08-22  0:00 ` [PATCH v3 7/8] EDAC/amd64: Support Asymmetric Dual-Rank DIMMs Ghannam, Yazen
2019-08-23 11:26   ` Borislav Petkov
2019-08-23 13:27     ` Ghannam, Yazen
2019-08-23 15:11       ` Borislav Petkov
2019-08-22  0:00 ` [RFC PATCH v3 10/10] EDAC/amd64: Check for memory before fully initializing an instance Ghannam, Yazen
2019-08-22 18:51   ` [RFC PATCH v2] " Ghannam, Yazen
2019-08-22  0:00 ` [RFC PATCH v3 09/10] EDAC/amd64: Use cached data when checking for ECC Ghannam, Yazen
2019-08-22  0:50 ` [PATCH v3 0/8] AMD64 EDAC fixes Adam Borowski
2019-08-22  8:35   ` Borislav Petkov
2019-08-22  9:46     ` Adam Borowski
2019-08-22  9:55       ` Borislav Petkov
2019-08-22 18:54   ` Ghannam, Yazen
2019-08-23 15:28     ` Ghannam, Yazen
2019-08-23 15:37       ` Borislav Petkov
2019-08-26 14:19         ` Ghannam, Yazen
2019-08-26 14:59           ` Borislav Petkov
2019-08-26 15:05             ` Ghannam, Yazen
2019-08-22 18:48 ` [RFC PATCH v2] EDAC/amd64: Check for memory before fully initializing an instance Ghannam, Yazen

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