Hi Nilay, Nilay Shroff <[email protected]> writes: > I have been using an NVMe disk on my PowerPC system that supports up to > 129 MSI-X interrupt vectors. Everything worked fine until Linux kernel > v6.18, after which the NVMe driver stopped detecting the disk because > the driver probe now fails. > > After further investigation, I found that the probe failure in v6.18 > occurs during PCI/MSI-X vector allocation. A git bisect identified > commit daaa574aba6f (“powerpc/pseries/msi: Switch to msi_create_parent_ > irq_domain()”) as the first bad commit.
Thanks for the report. I can (kind of) reproduce the problem with QEMU. I think moving rtas_prepare_msi_irqs() into pseries_irq_domain_alloc() should resolve the problem. But I'm not sure because I don't understand how RTAS works. Does IBM have some documentation describing the RTAS API? I failed to google it. Best regards, Nam
