linux-kernel - Re: [PATCH V12 05/10] acpi: apei: handle SEA notification type for ARMv8

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Message-ID: <a3de014f-a5b8-a7ed-fbd4-305e73a1f783@codeaurora.org>
Date:   Tue, 21 Mar 2017 13:19:12 -0600
From:   "Baicar, Tyler" <tbaicar@...eaurora.org>
To:     James Morse <james.morse@....com>
Cc:     christoffer.dall@...aro.org, marc.zyngier@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com, rjw@...ysocki.net,
        lenb@...nel.org, matt@...eblueprint.co.uk, robert.moore@...el.com,
        lv.zheng@...el.com, nkaje@...eaurora.org, zjzhang@...eaurora.org,
        mark.rutland@....com, akpm@...ux-foundation.org,
        eun.taik.lee@...sung.com, sandeepa.s.prabhu@...il.com,
        labbott@...hat.com, shijie.huang@....com, rruigrok@...eaurora.org,
        paul.gortmaker@...driver.com, tn@...ihalf.com, fu.wei@...aro.org,
        rostedt@...dmis.org, bristot@...hat.com,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
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        astone@...hat.com, harba@...eaurora.org, hanjun.guo@...aro.org,
        john.garry@...wei.com, shiju.jose@...wei.com, joe@...ches.com
Subject: Re: [PATCH V12 05/10] acpi: apei: handle SEA notification type for
 ARMv8

Hello James,


On 3/17/2017 10:43 AM, James Morse wrote:
> On 06/03/17 20:44, Tyler Baicar wrote:
>> ARM APEI extension proposal added SEA (Synchronous External Abort)
>> notification type for ARMv8.
>> Add a new GHES error source handling function for SEA. If an error
>> source's notification type is SEA, then this function can be registered
>> into the SEA exception handler. That way GHES will parse and report
>> SEA exceptions when they occur.
>> An SEA can interrupt code that had interrupts masked and is treated as
>> an NMI. To aid this the page of address space for mapping APEI buffers
>> while in_nmi() is always reserved, and ghes_ioremap_pfn_nmi() is
>> changed to use the helper methods to find the prot_t to map with in
>> the same way as ghes_ioremap_pfn_irq().
>> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
>> index b25e7cf..b0596ba 100644
>> --- a/drivers/acpi/apei/ghes.c
>> +++ b/drivers/acpi/apei/ghes.c
>> @@ -1023,6 +1075,13 @@ static int ghes_probe(struct platform_device *ghes_dev)
>>   		pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
>>   			   generic->header.source_id);
>>   		goto err;
>> +	case ACPI_HEST_NOTIFY_GPIO:
>> +	case ACPI_HEST_NOTIFY_SEI:
>> +	case ACPI_HEST_NOTIFY_GSIV:
>> +		pr_warn(GHES_PFX "Generic hardware error source: %d notified via notification type %u is not supported\n",
>> +			generic->header.source_id, generic->header.source_id);
>> +		rc = -ENOTSUPP;
>> +		goto err;
>>   	default:
>>   		pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
>>   			   generic->notify.type, generic->header.source_id);
>
> This hunk will conflict with Shiju Jose's patch[0] that adds GPIO and GSIV
> support. Can we remove it?
Yes, I was planning on removing this when I saw Shiju's patch. It will 
be removed in my v13.

Thanks,
Tyler
>
> [0] https://www.spinics.net/lists/linux-acpi/msg72654.html

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