PCI/MSI: Reject multi-MSI early

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When hierarchical MSI interrupt domains are enabled then there is no point
to do tons of work and detect the missing support for multi-MSI late in the
allocation path.

Just query the domain feature flags right away. The query function is going
to be used for other purposes later and has a mode argument which influences
the result:

  ALLOW_LEGACY returns true when:
     - there is no irq domain attached (legacy support)
     - there is a irq domain attached which has the feature flag set

  DENY_LEGACY returns only true when:
     - there is a irq domain attached which has the feature flag set

This allows to use the function universally without ifdeffery in the
calling code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20221111122015.574339988@linutronix.de

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This commit is contained in:

Thomas Gleixner 2022-11-11 14:55:09 +01:00

parent bab65e48cb

commit d2a463b297

3 changed files with 35 additions and 0 deletions

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22

drivers/pci/msi/irqdomain.c

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4

drivers/pci/msi/msi.c

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9

drivers/pci/msi/msi.h

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