Re: [PATCH v2] PCI/MSI: Improve MSI alias detection

[Marc Zyngier]

On 01/08/17 18:59, Robin Murphy wrote:
> Currently, we handle all DMA aliases equally when calculating MSI
> requester IDs for the generic infrastructure. This turns out to be the
> wrong thing to do in the face of pure DMA quirks like those of Marvell
> SATA cards, where in the usual case the last thing seen in the alias
> walk is the DMA phantom function: we end up configuring the MSI
> doorbell to expect that alias, then find we have no interrupts since
> the MSI writes still come from the 'real' RID, thus get filtered out
> and ignored.
> 
> Improve the alias walk to only account for the topological aliases that
> matter, based on the logic from the Intel IRQ remapping code.
> 
> Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>

Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>

	M.
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