linux-kernel - Re: [PATCH v5 2/2] acpi: apei: Add SEI notification type support for ARMv8

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Message-ID: <cdbf7880-a515-6394-fc24-6a4498cace2c@huawei.com>
Date:   Wed, 18 Oct 2017 18:21:38 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     James Morse <james.morse@....com>, Borislav Petkov <bp@...e.de>
CC:     <tbaicar@...eaurora.org>, <will.deacon@....com>,
        <rjw@...ysocki.net>, <lenb@...nel.org>, <robert.moore@...el.com>,
        <lv.zheng@...el.com>, <mark.rutland@....com>,
        <kristina.martsenko@....com>, <mingo@...nel.org>,
        <punit.agrawal@....com>, <stephen.boyd@...aro.org>,
        <kamensky@...co.com>, <prarit@...hat.com>, <shiju.jose@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <devel@...ica.org>, Huangshaoyu <huangshaoyu@...wei.com>,
        Wuquanming <wuquanming@...wei.com>
Subject: Re: [PATCH v5 2/2] acpi: apei: Add SEI notification type support for
 ARMv8

On 2017/10/18 17:44, James Morse wrote:
>> The thing is abbreviated as "SEI" and apparently means "System Error
>> Interrupt". Nothing else.
> ARM has 'external abort', which are either synchronous or asynchronous, both are
> delivered as different types of exception.
> 
> Asynchronous external abort is treated as a special kind of interrupt, 'SError
> Interrupt', (where SError stands for System Error, but its rarely written like
> that). 'SEI' is a relatively new abbreviation for SError interrupt.
> 
> 
> What should we call this thing? In the ACPI code I'd prefer 'SEI' as that is
> what the ACPI spec calls it. Here we are talking about an GHES notification.
> 
> But in the arm64 arch code this should be called SError Interrupt as this is
> what the ARM-ARM calls it. This code cares about exception routing and interrupt
> masking.
> 
> 
> But, I don't really care.

Thanks very much James's clear explanation.
I agree with James.

In the ACPI sepc, we usually call SEI as SError Interrupt, we rarely call SError to System Error,
Anyway I will explain clearly about the abbreviations in my next version patch.