Re: [PATCH 0/3] PCI: designware: Fixing MSI handling flow

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On Thu, 2018-11-15 at 15:22 +0000, Gustavo Pimentel wrote:
> On 14/11/2018 18:28, Trent Piepho wrote:
> > On Tue, 2018-11-13 at 22:57 +0000, Marc Zyngier wrote:
> > > 
> > Now it works again.  Race still present.  I don't see the
> > dw_pci_msi_bottom_(un)mask methods ever get called.  I seem to recall
> > that they are called as a substitute if enable/disable are not present,
> > but haven't confirmed that, which would explain why they are not called
> > after I added enable.
> 
> Hum, this probably is correlated with [1] where on the describition the this
> enumerator says that "One shot does not require mask/unmask" see [2]

That seems reasonable then.  I've said before that while I think
masking could be added in the interrupt flow without breaking anything,
I think it's redundant to do it at this layer.

I suspect it might be possible mask/unmask the interrupt "manually",
e.g. UIO does this to allow handling a level interrupt from userspace,
and that would be a path to reach the mask methods.




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