Date: Thu, 11 Sep 2008 17:13:47 -0500 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: John Baldwin <jhb@freebsd.org> Cc: Peter Grehan <grehan@freebsd.org>, freebsd-ppc@freebsd.org Subject: Re: Call for testers: Apple ATA DMA Message-ID: <48C9981B.2020808@freebsd.org> In-Reply-To: <200809111651.05462.jhb@freebsd.org> References: <48C69864.3010208@freebsd.org> <200809111304.48753.jhb@freebsd.org> <48C9642A.5020801@freebsd.org> <200809111651.05462.jhb@freebsd.org>
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John Baldwin wrote:
> On Thursday 11 September 2008 02:32:10 pm Peter Grehan wrote:
>
>> Hi John,
>>
>>
>>> So when I did the MSI stuff I had assumed (apparently incorrectly), that
>>>
> PCI
>
>>> functions would only every have 1 non-MSI interrupt (since there is only a
>>> single INTLINE config register). Is the extra interrupt coming from OF?
>>>
> If
>
>>> so, does OF support MSI at all? You could always change the OF PCI bus
>>> driver to not do MSI and use rid 1 IRQ for the OF indicated IRQ for a PCI
>>> device by having custom alloc_resource/setup_intr/teardown_intr methods.
>>>
>> Int lines on the Mac go directly into the OpenPIC, allowing as many
>> int sources as desired. The intline config register isn't really used,
>> though there is code that attempts to read the OFW interrupt properties
>> and then program that register to avoid messing with the PCI common
>> code. Unfortunately, some Mac devices ignore writes to that register :(
>> The G5 does support MSI.
>>
>> I had sent a possible solution to Nathan (Nathan: check your junk :)
>> that in pci_setup_intr did something like:
>>
>> if (dinfo->cfg.msi.msi_addr > 0) {
>> ...
>> } else if (dinfo->cfg.msi.msix_alloc > 0) {
>> ...
>> } else {
>> #ifndef __powerpc__
>> KASSERT("No MSI or MSI-X interrupts allocated")
>> #endif
>> }
>>
>> There's probably a bunch of other places that need fixing but this was
>> an obvious one.
>>
>
> OFW should already have its own PCI bus driver, so I'd rather you give it its
> own bus_setup_intr() method that DTRT for these interrupt resources (rid > 0
> and !MSI) and then calls pci_setup_intr() for the rest. Then you don't have
> to add MD hacks to the generic PCI bus driver.
>
It doesn't on PowerPC. There are a bunch of hacks done at attach-time to
compensate for this (see ofw_pci_fixup()). It might be nice to import
sparc64's PCI OFW bus code, though.
-Nathan
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