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iommm/amd: Store irq domain in struct device

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As the next 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.

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/20200826112333.806328762@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-08-26 13:17:00 +02:00
parent 85a8dfc57a
commit 2b2c6aa638
1 changed files with 16 additions and 1 deletions
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17
drivers/iommu/amd/iommu.c
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@ -729,7 +729,21 @@ static void iommu_poll_ga_log(struct amd_iommu *iommu)
}
}
}
#endif /* CONFIG_IRQ_REMAP */
static void
amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu)
{
if (!irq_remapping_enabled || !dev_is_pci(dev) ||
pci_dev_has_special_msi_domain(to_pci_dev(dev)))
return;
dev_set_msi_domain(dev, iommu->msi_domain);
}
#else /* CONFIG_IRQ_REMAP */
static inline void
amd_iommu_set_pci_msi_domain(struct device *dev, struct amd_iommu *iommu) { }
#endif /* !CONFIG_IRQ_REMAP */
#define AMD_IOMMU_INT_MASK \
(MMIO_STATUS_EVT_INT_MASK | \
@ -2157,6 +2171,7 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev)
iommu_dev = ERR_PTR(ret);
iommu_ignore_device(dev);
} else {
amd_iommu_set_pci_msi_domain(dev, iommu);
iommu_dev = &iommu->iommu;
}