[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <497A0836.5060707@rtr.ca>
Date: Fri, 23 Jan 2009 13:11:02 -0500
From: Mark Lord <liml@....ca>
To: Robert Hancock <hancockr@...w.ca>
Cc: michael@...erman.id.au, 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 ?
Robert Hancock wrote:
> Mark Lord wrote:
>> Michael Ellerman wrote:
>>> On Tue, 2009-01-20 at 20:02 -0800, Grant Grundler wrote:
>> ..
..
>>> 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..
>
> What kind of PCI-X bridge does that machine have? I know some AMD
> HyperTransport to PCI-X bridges have broken MSI, but those should be
> blacklisted already in the kernel..
..
Okay, I'm back looking at this now. In the interim, the box has undergone
a complete re-install, and I think the original boot logs are gone for good.
Now (with 2.6.28.1), the boot code identifies a quirk, and pci_enable_msi()
does indeed fail where it once succeeded. So all is well, but I don't know
why it wasn't working correctly earlier.
Oh well.
Cheers
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists