linux-kernel - Re: [PATCH 4/5] PCI: iproc: Add iProc PCIe MSI support

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Message-ID: <564E55BB.1030708@broadcom.com>
Date:	Thu, 19 Nov 2015 15:05:31 -0800
From:	Ray Jui <rjui@...adcom.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	<linux-kernel@...r.kernel.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-pci@...r.kernel.org>
Subject: Re: [PATCH 4/5] PCI: iproc: Add iProc PCIe MSI support

Hi Arnd,

On 11/19/2015 12:31 AM, Arnd Bergmann wrote:
> On Wednesday 18 November 2015 17:37:16 Ray Jui wrote:

>> I haven't spent too much time investigating, and am hoping to eventually
>> enable affinity support with an incremental patch in the future when I
>> have more time to investigate.
>
> Is it possible that you have a set of MSIs per GIC interrupt (as Marc
> suggested earlier) and that the way it is intended to be used is by
> having each one of them target a different CPU? That way you can do
> affinity by switching to a different MSI in .set_affinity(), I think
> that is how the old style MSI all used to work when each CPU had its
> own MSI register.
>
> 	Arnd
>

Okay, I see that Xgene MSI has a very similar implementation to support 
MSI IRQ affinity. I plan to take a closer look and try it out in the 
future. But it likely won't be included in the current round of patch set.

Thanks,

Ray
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