[PATCH v11 09/14] irqchip/riscv-imsic: Add support for PCI MSI irqdomain

[Thomas Gleixner]

On Wed, Oct 25 2023 at 10:55, Björn Töpel wrote:
>> Now for IMSIC-PCI domain, the PCI framework expects the
>> pci_msi_mask/unmask_irq() functions to be called but if
>> we directly point pci_msi_mask/unmask_irq() in the IMSIC-PCI
>> irqchip then IMSIC-BASE (parent domain) irq_mask/umask
>> won't be called hence the IRQ won't be masked/unmask.
>> Due to this, we call both pci_msi_mask/unmask_irq() and
>> irq_chip_mask/unmask_parent() for IMSIC-PCI domain.
>
> Ok. I wont dig more into it for now! If the interrupt is disabled at
> PCI, it seems a bit overkill to *also* mask it at the IMSIC level...

Only _if_ the device provides MSI masking, but that extra mask/unmask is
not the end of the world.

Thanks,

        tglx