ARM64 PCI [Was Re: APPLIED: [PULL][Trusty][SRU] UBUNTU: SAUCE: (no-up) pci-xgene-msi: fixed deadlock in irq_set_affinity]

[Tim Gardner]

On 08/29/2014 10:12 AM, Dann Frazier wrote:
> On Thu, Aug 28, 2014 at 10:42 AM, Tim Gardner <tim.gardner at canonical.com> wrote:
>> This doesn't apply to Utopic, so you ought to think about a forward port.
>
> Yeah - we currently don't have any PCI support for arm64 in utopic :)
> And that's actually a discussion I wanted to bring up.
>
> When we enabled PCI for ARM64 in trusty, we went with this
> vendor-specific stack because there really wasn't another option at
> the time. Liviu Dudau has since been iterating on a generic arm64
> patch series, but it has taken a lot of review cycles - mostly (imo)
> due to the preliminary architecture cleanup he was asked to do. I've
> included his series in my hyperscale PPA for testing and have had good
> results. I hope to eventually get this series merged into utopic so
> that we can support additional ARM64 server platforms.
>
> My plan A has been to propose merging Liviu's changes once they hit
> -next, and hopefully that happens soon. But if it doesn't, at some
> point we'll need to make a call on whether to merge them early or
> bring back the vendor-specific stack temporarily to avoid regressions.
> What's your guidance for how long I should wait before sending a plan
> B pull request?
>

October 9 is kernel freeze, so you ought to make a decision a couple of 
weeks in advance in order to ferret out any load related regressions.

rtg
-- 
Tim Gardner tim.gardner at canonical.com