Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com;
From:   Yazen Ghannam <yazen.ghannam@amd.com>
To:     <linux-edac@vger.kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <tony.luck@intel.com>,
        <x86@kernel.org>, <Smita.KoralahalliChannabasappa@amd.com>,
        Yazen Ghannam <yazen.ghannam@amd.com>
Subject: [PATCH 3/3] EDAC/mce_amd: Add support for FRU Text in MCA
Date:   Mon, 18 Apr 2022 17:44:40 +0000
Message-ID: <20220418174440.334336-4-yazen.ghannam@amd.com>
In-Reply-To: <20220418174440.334336-1-yazen.ghannam@amd.com>
References: <20220418174440.334336-1-yazen.ghannam@amd.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Apr 2022 17:44:59.6972
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: f57f0323-bd48-4e83-1e2d-08da216328f3
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT005.eop-nam11.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4574
X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,
        RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE
        autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

A new "FRU Text in MCA" feature is defined where the Field Replaceable
Unit (FRU) Text for a device is represented by a string in the new
MCA_SYND1 and MCA_SYND2 registers. This feature is supported per MCA
bank, and it is advertised by the McaFruTextInMca bit (MCA_CONFIG[9]).

The FRU Text is populated dynamically for each individual error state
(MCA_STATUS, MCA_ADDR, et al.). This handles the case where an MCA bank
covers multiple devices, for example, a Unified Memory Controller (UMC)
bank that manages two DIMMs.

Print the FRU Text string, if available, when decoding an MCA error.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
 drivers/edac/mce_amd.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index 28b48c711fe0..3cacc3f22379 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -1235,6 +1235,7 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 {
 	struct mce *m = (struct mce *)data;
 	unsigned int fam = x86_family(m->cpuid);
+	u64 mca_config = 0;
 	int ecc;
 
 	if (m->kflags & MCE_HANDLED_CEC)
@@ -1254,11 +1255,10 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 		((m->status & MCI_STATUS_PCC)	? "PCC"	  : "-"));
 
 	if (boot_cpu_has(X86_FEATURE_SMCA)) {
-		u32 low, high;
 		u32 addr = MSR_AMD64_SMCA_MCx_CONFIG(m->bank);
 
-		if (!rdmsr_safe(addr, &low, &high) &&
-		    (low & MCI_CONFIG_MCAX))
+		if (!rdmsrl_safe_on_cpu(m->extcpu, addr, &mca_config) &&
+		    (mca_config & MCI_CONFIG_MCAX))
 			pr_cont("|%s", ((m->status & MCI_STATUS_TCC) ? "TCC" : "-"));
 
 		pr_cont("|%s", ((m->status & MCI_STATUS_SYNDV) ? "SyndV" : "-"));
@@ -1300,6 +1300,17 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 		pr_cont("\n");
 
 		decode_smca_error(m);
+
+		if (mca_config & BIT(9)) {
+			char frutext[32];
+
+			memset(frutext, 0, sizeof(frutext));
+			memcpy(&frutext[0], &m->synd1, 8);
+			memcpy(&frutext[8], &m->synd2, 8);
+
+			pr_emerg(HW_ERR "FRU Text: %s\n", frutext);
+		}
+
 		goto err_code;
 	}
 
-- 
2.25.1