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genirq/msi: Provide constants for PCI/IMS support

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Provide the necessary constants for PCI/IMS support:

  - A new bus token for MSI irqdomain identification
  - A MSI feature flag for the MSI irqdomains to signal support
  - A secondary domain id

The latter expands the device internal domain pointer storage array from 1
to 2 entries. That extra pointer is mostly unused today, but the
alternative solutions would not be free either and would introduce more
complexity all over the place. Trade the 8bytes for simplicity.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124232326.846169830@linutronix.de
This commit is contained in:
Thomas Gleixner
2022-11-25 00:26:28 +01:00
parent 486254ad96
commit e23d4192bf
3 changed files with 4 additions and 0 deletions
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1
include/linux/irqdomain_defs.h
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@@ -25,6 +25,7 @@ enum irq_domain_bus_token {
DOMAIN_BUS_PCI_DEVICE_MSIX,
DOMAIN_BUS_DMAR,
DOMAIN_BUS_AMDVI,
DOMAIN_BUS_PCI_DEVICE_IMS,
};
#endif /* _LINUX_IRQDOMAIN_DEFS_H */