linux-kernel - [PATCH RFC 2/4] arm64: mm: Add RAS extension system register check to SEA handling

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Date:   Tue, 2 Jul 2019 16:51:46 +0000
From:   Tyler Baicar OS <baicar@...amperecomputing.com>
To:     Open Source Submission <patches@...erecomputing.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "james.morse@....com" <james.morse@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "guohanjun@...wei.com" <guohanjun@...wei.com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "Matteo.Carlini@....com" <Matteo.Carlini@....com>,
        "Andrew.Murray@....com" <Andrew.Murray@....com>
CC:     Tyler Baicar OS <baicar@...amperecomputing.com>
Subject: [PATCH RFC 2/4] arm64: mm: Add RAS extension system register check to
 SEA handling

On systems that support the ARM RAS extension, synchronous external
abort syndrome information could be captured in the core's RAS extension
system registers. So, when handling SEAs check the RAS system registers
for error syndrome information.

Signed-off-by: Tyler Baicar <baicar@...amperecomputing.com>
---
 arch/arm64/mm/fault.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 2d11501..76b42ca 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -37,6 +37,7 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 #include <asm/traps.h>
+#include <asm/ras.h>
 
 struct fault_info {
 	int	(*fn)(unsigned long addr, unsigned int esr,
@@ -632,6 +633,8 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
 
 	inf = esr_to_fault_info(esr);
 
+	arch_arm_ras_report_error();
+
 	/*
 	 * Return value ignored as we rely on signal merging.
 	 * Future patches will make this more robust.
-- 
1.8.3.1