Michael Ellerman <[email protected]> writes:
> On Thu, 2007-05-24 at 22:19 -0600, Eric W. Biederman wrote:
>> Currently we blacklist known bad msi configurations which means we
>> keep getting MSI enabled on chipsets that either do not support MSI,
>> or MSI is implemented improperly. Since the normal IRQ routing
>> mechanism seems to works even when MSI does not, this is a bad default
>> and causes non-functioning systems for no good reason.
>>
>> So this patch inverts the sense of the MSI bus flag to only enable
>> MSI on known good systems. I am seeding that list with the set of
>> chipsets with an enabled hypertransport MSI mapping capability. Which
>> is as close as I can come to an generic MSI enable. So for actually
>> using MSI this patch is a regression, but for just having MSI enabled
>> in the kernel by default things should just work with this patch
>> applied.
>
> I guess this is a good idea for random x86 machines. On powerpc I think
> we'll just turn it on for every bus, and let the existing per-platform
> logic decide.
Yep. That is pretty much what I expected.
Since you already have to detect how to implement the MSI methods
you need a separate white list anyway.
Just a side note. This only needs to be enabled for pci root
busses.
Eric
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