iommm/vt-d: Store irq domain in struct device

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As a first step to make X86 utilize the direct MSI irq domain operations
store the irq domain pointer in the device struct when a device is probed.

This is done from dmar_pci_bus_add_dev() because it has to work even when
DMA remapping is disabled. It only overrides the irqdomain of devices which
are handled by a regular PCI/MSI irq domain which protects PCI devices
behind special busses like VMD which have their own irq domain.

No functional change. It just avoids the redirection through
arch_*_msi_irqs() and allows the PCI/MSI core to directly invoke the irq
domain alloc/free functions instead of having to look up the irq domain for
every single MSI interupt.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200826112333.714566121@linutronix.de

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This commit is contained in:

Thomas Gleixner 2020-08-26 13:16:59 +02:00

parent 2e4386eba0

commit 85a8dfc57a

3 changed files with 26 additions and 0 deletions

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3

drivers/iommu/intel/dmar.c

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16

drivers/iommu/intel/irq_remapping.c

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7

include/linux/intel-iommu.h

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