linux-kernel - Re: [PATCH v4 pci 0/2] PCI/MSI: pci-xgene-msi: Enable MSI support in ACPI boot for X-Gene v1

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Message-ID: <CAAsHzqvrdq91MQy2zuwzogZMOnf6zXs7XEeT1_++E5VssY-f3A@mail.gmail.com>
Date:   Wed, 18 Oct 2017 14:43:10 -0700
From:   Khuong Dinh <kdinh@....com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Marc Zyngier <marc.zyngier@....com>, msalter@...hat.com,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        jcm@...hat.com, patches <patches@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        rjw@...ysocki.net
Subject: Re: [PATCH v4 pci 0/2] PCI/MSI: pci-xgene-msi: Enable MSI support in
 ACPI boot for X-Gene v1

Hi Lorenzo,


On Wed, Oct 18, 2017 at 2:26 AM, Lorenzo Pieralisi
<lorenzo.pieralisi@....com> wrote:
> [removed unintended disclaimer]
>
> On Tue, Oct 17, 2017 at 10:45:35PM -0700, Khuong Dinh wrote:
>> Hi Lorenzo,
>>
>> On Tue, Oct 17, 2017 at 6:38 AM, Lorenzo Pieralisi
>> <lorenzo.pieralisi@....com> wrote:
>> > Hi Khuong,
>> >
>> > On Mon, Oct 16, 2017 at 02:19:50PM -0700, Khuong Dinh wrote:
>> >> Hi Lorenzo,
>> >>   Do you have any comments for this patch?
>> >
>> > I'd have some comments but given that there are related issues with ACPI
>> > probe ordering that Marc is trying to solve on his side - I will work
>> > with him to see if we can accommodate changes that can solve this issue
>> > too.
>> >
>> > Again - I recognize it is a complex problem (that is not even
>> > contemplated by the current ACPI specs), we have to try to make
>> > the solution as generic as we can to prevent reinventing the wheel
>> > anytime a sligthly different issue (related to ACPI probe ordering)
>> > comes up.
>> >
>> > Leave it to me (us) and I will get back to you on this.
>>
>> Thanks for helping to take care of the generic ACPI probe ordering issue.
>> Given that the patch 'PCI/MSI: pci-xgene-msi: Enable MSI support in ACPI
>> boot for X-Gene v1" adds only the ACPI ID, can you pull in this patch
>> independently from the ACPI probe ordering issue?
>
> No. For two reasons:
>
> 1) It's Bjorn who decides whether that code can be merged or not, not me
> 2) That patch sneaks in ACPI MSI support for X-gene v1 that depends on
>    kernel link ordering. As soon as it is pulled in the mainline it
>    creates a dependency on pseudo-working code that may break anytime
>    and as I said many times before I am not willing to rely on that.

Thanks for your information. I got it.
I look forward to hearing your updated information about this generic
ACPI probe ordering issue.


> Lorenzo