linux-kernel - [PATCH v2 3/3] arm64/ras: save error address from memory section for recovery

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Date:   Tue, 5 Sep 2017 19:06:06 +0800
From:   Xie XiuQi <xiexiuqi@...wei.com>
To:     <catalin.marinas@....com>, <will.deacon@....com>,
        <mingo@...hat.com>, <mark.rutland@....com>,
        <ard.biesheuvel@...aro.org>, <james.morse@....com>,
        <Dave.Martin@....com>, <takahiro.akashi@...aro.org>,
        <tbaicar@...eaurora.org>, <stephen.boyd@...aro.org>, <bp@...e.de>,
        <shiju.jose@...wei.com>, <zjzhang@...eaurora.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <xiexiuqi@...wei.com>, <wangxiongfeng2@...wei.com>,
        <zhengqiang10@...wei.com>, <gengdongjiu@...wei.com>,
        <huawei.libin@...wei.com>, <wangkefeng.wang@...wei.com>,
        <lijinyue@...wei.com>, <guohanjun@...wei.com>
Subject: [PATCH v2 3/3] arm64/ras: save error address from memory section for recovery

In some platform, when SEA triggerred, physical address might be
reported by memory section, so we save it for error recovery later.

Signed-off-by: Xie XiuQi <xiexiuqi@...wei.com>
Tested-by: Wang Xiongfeng <wangxiongfeng2@...wei.com>
---
 arch/arm64/kernel/ras.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm64/kernel/ras.c b/arch/arm64/kernel/ras.c
index 5710b2e..8a44c01 100644
--- a/arch/arm64/kernel/ras.c
+++ b/arch/arm64/kernel/ras.c
@@ -141,3 +141,34 @@ void arm_process_error(struct ghes *ghes, struct cper_sec_proc_arm *err)
 		set_thread_flag(TIF_SEA_NOTIFY);
 }
 
+int ghes_mem_err_callback(struct notifier_block *nb, unsigned long val, void *data)
+{
+	bool info_saved = false;
+	struct ghes_mem_err *ghes_mem = (struct ghes_mem_err *)data;
+	struct cper_sec_mem_err *mem_err = ghes_mem->mem_err;
+
+	if ((ghes_mem->notify_type != ACPI_HEST_NOTIFY_SEA) ||
+	    (ghes_mem->severity != CPER_SEV_RECOVERABLE))
+		return 0;
+
+	if (mem_err->validation_bits & CPER_MEM_VALID_PA) {
+		info_saved = sea_save_info(mem_err->physical_addr);
+	}
+
+	if (info_saved)
+		set_thread_flag(TIF_SEA_NOTIFY);
+
+	return 0;
+}
+
+static struct notifier_block ghes_mem_err_nb = {
+	.notifier_call	= ghes_mem_err_callback,
+};
+
+static int arm64_err_recov_init(void)
+{
+	atomic_notifier_chain_register(&ghes_mem_err_chain, &ghes_mem_err_nb);
+	return 0;
+}
+
+late_initcall(arm64_err_recov_init);
-- 
1.8.3.1