linux-kernel - Re: libata, devm

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Message-ID: <4977399F.7000104@rtr.ca>
Date:	Wed, 21 Jan 2009 10:05:03 -0500
From:	Mark Lord <liml@....ca>
To:	michael@...erman.id.au
Cc:	Grant Grundler <grundler@...gle.com>,
	Daniel Barkalow <barkalow@...ervon.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Tejun Heo <htejun@...il.com>, Jeff Garzik <jgarzik@...ox.com>,
	linux-pci@...r.kernel.org
Subject: Re: libata, devm_*, and MSI ?

Michael Ellerman wrote:
> On Tue, 2009-01-20 at 20:02 -0800, Grant Grundler wrote:
..
>> 1) post lspci -v output to verify device (and bridges) is programmed correctly.
>> 2) look for chipset quirks that disable global msi
> 
> The kernel shouldn't let you enable MSI if that's the case, ie.
> pci_enable_msi() should fail.
..

Exactly.  So it shouldn't be that, then.

> It might still be worth looking at the quirks though, in case there's
> one for a previous revision of your bridge or something.
> 
>> 3) Make sure MMIO ranges for 0xfee00000 are routed to local APIC
>>    ie each bridge needs to route that address somehow (negative decode
>> is common for upstream).
>> 4) manually trigger the MSI by doing a MMIO write to the correct
>> 0xfee00000 address with the assigned vector in order to see if your
>> interrupt handler gets called.
> 
> And can you plug something directly into the PCIe bus? If so does MSI
> work on that?
..

Yup.  PCIe cards have no problem with MSI in that box.

More later..
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