linux-kernel - Re: [PATCH v9 10/15] ACPI: platform-msi: retrieve dev id from IORT

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Date:   Thu, 30 Mar 2017 11:07:32 +0800
From:   Hanjun Guo <hanjun.guo@...aro.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <marc.zyngier@....com>
CC:     Hanjun Guo <guohanjun@...wei.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Tomasz Nowicki <tn@...ihalf.com>, Ma Jun <majun258@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Sinan Kaya <okaya@...eaurora.org>, huxinwei@...wei.com,
        yimin@...wei.com, linuxarm@...wei.com, majun258@...iwei.com,
        "xuwei (O)" <xuwei5@...ilicon.com>
Subject: Re: [PATCH v9 10/15] ACPI: platform-msi: retrieve dev id from IORT

On 03/30/2017 01:32 AM, Lorenzo Pieralisi wrote:
> On Wed, Mar 29, 2017 at 05:13:54PM +0100, Lorenzo Pieralisi wrote:
>> On Wed, Mar 29, 2017 at 03:52:47PM +0100, Marc Zyngier wrote:
>>> On 29/03/17 14:00, Hanjun Guo wrote:
>>>> On 03/29/2017 08:38 PM, Lorenzo Pieralisi wrote:
>>>>> On Wed, Mar 29, 2017 at 07:52:48PM +0800, Hanjun Guo wrote:
>>>>>> Hi Lorenzo,
>>>>>>
>>>>>> On 03/29/2017 06:14 PM, Lorenzo Pieralisi wrote:
>>>>>>> Hi Hanjun, Marc,
>>>>>>>
>>>>>>> On Tue, Mar 07, 2017 at 08:40:05PM +0800, Hanjun Guo wrote:
[...]
>>>>>>>>    drivers/acpi/arm64/iort.c                     | 24 ++++++++++++++++++++++++
>>>>>>>>    drivers/irqchip/irq-gic-v3-its-platform-msi.c |  3 ++-
>>>>>>>>    include/linux/acpi_iort.h                     |  5 +++++
>>>>>>>>    3 files changed, 31 insertions(+), 1 deletion(-)
>>>>>>>
>>>>>>> To simplify merging ACPI/IRQCHIP changes via different trees it
>>>>>>> would be good to split this patch; I am not sure what's the best
>>>>>>> way of handling it though given that we would end up in a merge
>>>>>>> ordering dependency anyway (ie we can create an empty stub
>>>>>>> for iort_pmsi_get_dev_id() but that would create a dependency
>>>>>>> between ARM64 and irqchip trees anyway).
>>>>>>
>>>>>> The first 12 patches for ACPI platform MSI and later 3 patches
>>>>>> for mbigen have no "physical" dependency, which means they can
>>>>>> be merged and compiled independently, they only have functional
>>>>>> dependency only.
>>>>>>
>>>>>> We already had SAS, XGE, USB and even UART drivers depend on
>>>>>> the mbigen ACPI support, so I don't think the dependency of ACPI
>>>>>> platform MSI and mbigen patches cares much if those two parts are
>>>>>> merged in one merge window, even they are merged independently via
>>>>>> different tree.
>>>>>>
>>>>>>>
>>>>>>> Please let me know what's your preferred way of handling this.
>>>>>>
>>>>>> So in my opinion, they can be merged independently via ARM64 and
>>>>>> irqchip tree with no ordering dependency, is it OK?
>>>>>
>>>>> I am speaking about merging MBIgen AND ITS patches via IRQCHIP and
>>>>> ACPI/IORT for ARM64, that's why I replied to this patch. I do not
>>>>> think that's feasible to split patches in two separate branches
>>>>> without having a dependency between them.
>>>>>
>>>>> Sure, the last three patches can go via IRQCHIP but that was not
>>>>> my question :)
>>>>
>>>> Sorry, I misunderstood that :(
>>>>
>>>> Since it's not feasible to split patches, the best way I got is that
>>>> we get Marc's ack then merge it.
>>>
>>> I believe there is a way to make this work without too much hassle. I
>>> suggest we drop the ITS change from this patch entirely, and I instead
>>> queue this patch:
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?h=irq/irqchip-4.12&id=e6db07d0f3b6da1f8cfd485776bfefa4fcdbfc45
>>>
>>> That way, no dependency between the two trees. Lorenzo takes all the
>>> patches flagged "ACPI", I take all those flagged "irqchip" or "msi", and
>>> everything should be perfectly standalone.
>>>
>>> Thoughts?
>>
>> Perfect for me. Hanjun, I can cherry pick Marc's patch above, rework
>> this patch and post the resulting branch for everyone to have a final
>> test.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/linux.git acpi/arm64-acpi-4.12
>
> Please have a look and let me know if that's ok, I planned to send
> a PR to Catalin by the end of the week (first 7 patches up to
> 7fc3061df075 ("ACPI: platform: setup MSI domain for ACPI based platform
> device")).

Perfect for me too, Lorenzo, Marc, Thank you very much.

I'm currently in paternity leave and can't reach the machine,
I had a detail review with the patches, they looks good to me,
Ma Jun and Wei Xu will test on Hisilicon machines and give the
feedback.

Thanks
Hanjun