On Tue, Nov 10 2020 at 19:21, David Woodhouse wrote: > On 10 November 2020 18:56:17 GMT, Thomas Gleixner <t...@linutronix.de> wrote: >>On Tue, Nov 10 2020 at 18:50, Thomas Gleixner wrote: >>> On Tue, Nov 10 2020 at 16:33, David Woodhouse wrote: >>>> If I could get post-5.5 kernels to boot at all with the AMD IOMMU >>>> enabled, I'd have a go at throwing that together now... >>> >>> It can share the dmar domain code. Let me frob something. >> >>Not much to share there and I can't access my AMD machine at the >>moment. Something like the untested below should work. > > Does it even need its own irqdomain? Can it not just allocate directly > from the vector domain then program its own register directly based on > the irq_cfg?
It uses pci_enable_msi() and I have no clue about that piece of hardware and whether that is actually required or not. If it is, then it needs a domain because that's what pci_enable_msi() uses. Thanks, tglx