linux-kernel - Re: [PATCH V10 05/10] acpi: apei: handle SEA notification type for ARMv8

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Date:   Tue, 21 Feb 2017 09:52:54 -0700
From:   "Baicar, Tyler" <tbaicar@...eaurora.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Christoffer Dall <christoffer.dall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Paolo Bonzini <pbonzini@...hat.com>, rkrcmar@...hat.com,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Robert Moore <robert.moore@...el.com>,
        Lv Zheng <lv.zheng@...el.com>, nkaje@...eaurora.org,
        "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>,
        James Morse <james.morse@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        eun.taik.lee@...sung.com, sandeepa.s.prabhu@...il.com,
        Laura Abbott <labbott@...hat.com>, shijie.huang@....com,
        Richard Ruigrok <rruigrok@...eaurora.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Tomasz Nowicki <tn@...ihalf.com>, Fu Wei <fu.wei@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>, bristot@...hat.com,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        KVM devel mailing list <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        devel@...ica.org, "Suzuki K. Poulose" <Suzuki.Poulose@....com>,
        Punit Agrawal <punit.agrawal@....com>, astone@...hat.com,
        harba@...eaurora.org, Hanjun Guo <hanjun.guo@...aro.org>,
        john.garry@...wei.com, shiju.jose@...wei.com
Subject: Re: [PATCH V10 05/10] acpi: apei: handle SEA notification type for
 ARMv8

Hello Ard,


On 2/16/2017 11:32 AM, Ard Biesheuvel wrote:
> On 15 February 2017 at 19:51, Tyler Baicar <tbaicar@...eaurora.org> 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().
>>
>> Signed-off-by: Tyler Baicar <tbaicar@...eaurora.org>
>> Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
>> Signed-off-by: Naveen Kaje <nkaje@...eaurora.org>
>> ---
>>   arch/arm64/Kconfig        |  2 ++
>>   arch/arm64/mm/fault.c     | 13 ++++++++
>>   drivers/acpi/apei/Kconfig | 14 +++++++++
>>   drivers/acpi/apei/ghes.c  | 77 +++++++++++++++++++++++++++++++++++++++++++----
>>   include/acpi/ghes.h       |  7 +++++
>>   5 files changed, 107 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 1117421..8557556 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>>
>> @@ -498,6 +500,17 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>>          pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",
>>                   fault_name(esr), esr, addr);
>>
>> +       /*
>> +        * Synchronous aborts may interrupt code which had interrupts masked.
>> +        * Before calling out into the wider kernel tell the interested
>> +        * subsystems.
>> +        */
>> +       if(IS_ENABLED(HAVE_ACPI_APEI_SEA)) {
> Missing space after 'if'
I'll add that in.
>> +               nmi_enter();
>> +               ghes_notify_sea();
>> +               nmi_exit();
>> +       }
>> +
>>          info.si_signo = SIGBUS;
>>          info.si_errno = 0;
>>          info.si_code  = 0;
>> diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
>> index b0140c8..ef7f7bd 100644
>> --- a/drivers/acpi/apei/Kconfig
>> +++ b/drivers/acpi/apei/Kconfig
>> @@ -4,6 +4,20 @@ config HAVE_ACPI_APEI
>>   config HAVE_ACPI_APEI_NMI
>>          bool
>>
>> +config HAVE_ACPI_APEI_SEA
> HAVE_xxx Kconfig options are typically non user selectable, so I
> suggest to drop the HAVE_ prefix here. Also, you should probably make
> it 'default y' rather than select it elsewhere; this will still honour
> the dependency on ARM64 && ACPI_APEI_GHES
>
Okay, I will drop the HAVE_ and add in the default y

Thanks,
Tyler

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