linux-kernel - Re: [PATCH v2 2/6] PCI/MSI: Factor out pci_get_msi

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Message-ID: <20130925210016.GA8926@htj.dyndns.org>
Date:	Wed, 25 Sep 2013 17:00:16 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Alexander Gordeev <agordeev@...hat.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Michael Ellerman <michael@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Jan Beulich <JBeulich@...e.com>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 2/6] PCI/MSI: Factor out pci_get_msi_cap() interface

Hello,

On Wed, Sep 25, 2013 at 10:58:05PM +0200, Alexander Gordeev wrote:
> Unfortunately, pSeries is a shows-topper here :( It seems we have to
> introduce pci_get_msi{,x}_limit() interfaces to honour the quota
> thing.  I just hope the hardware set for pSeries is limited and we
> won't need to use it for all drivers.

Can you please go into a bit of detail on that?  Why does it matter?
Is it because you're worried you might cause performance regression by
forcing prevoius partial multiple allocations to single interrupt
operation?

Thanks.

-- 
tejun
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