[PASEMI] Nemo board doesn't recognize any ATA disks with the pci-v5.16 updates

[Robert Święcki]

> [+CC Adding Robert for visibility]
>
> Hi Arnd,
>
> Thank you looking at this!  Much appreciated.
>
> > > > You could attach the kernel config there, too, since it didn't make it
> > > > to the mailing list (vger may discard them -- see
> > > > http://vger.kernel.org/majordomo-info.html).
> > >
> > > Bjorn and I looked at which commits that went with a recent Pull Request
> > > from us might be causing this, but we are a little bit at loss, and were
> > > hoping that you could give us a hand in troubleshooting this.
> >
> > For reference, these are the patches in that branch that touch any
> > interesting files,
> > as most of the contents are for pci-controller drivers that are not used on
> > powerpc at all:
> >
> > $ git log --no-merges --oneline 512b7931ad05..dda4b381f05d
> > arch/powerpc/ drivers/of/  drivers/pci/*.[ch]  include/linux/
> > acd61ffb2f16 PCI: Add ACS quirk for Pericom PI7C9X2G switches
> > 978fd0056e19 PCI: of: Allow matching of an interrupt-map local to a PCI device
> > 041284181226 of/irq: Allow matching of an interrupt-map local to an
> > interrupt controller
> > 0ab8d0f6ae3f irqdomain: Make of_phandle_args_to_fwspec() generally available
> > 5ec0a6fcb60e PCI: Do not enable AtomicOps on VFs
> > 7a41ae80bdcb PCI: pci-bridge-emul: Fix emulation of W1C bits
> > fd1ae23b495b PCI: Prefer 'unsigned int' over bare 'unsigned'
> > ff5d3bb6e16d PCI: Remove redundant 'rc' initialization
> > 3331325c6347 PCI/VPD: Use pci_read_vpd_any() in pci_vpd_size()
> > e1b0d0bb2032 PCI: Re-enable Downstream Port LTR after reset or hotplug
> > ac8e3cef588c PCI/sysfs: Explicitly show first MSI IRQ for 'irq'
> > 88dee3b0efe4 PCI: Remove unused pci_pool wrappers
> > b5f9c644eb1b PCI: Remove struct pci_dev->driver
> > 2a4d9408c9e8 PCI: Use to_pci_driver() instead of pci_dev->driver
> > 4141127c44a9 powerpc/eeh: Use to_pci_driver() instead of pci_dev->driver
> > f9a6c8ad4922 PCI/ERR: Reduce compile time for CONFIG_PCIEAER=n
> > 43e85554d4ed xen/pcifront: Use to_pci_driver() instead of pci_dev->driver
> > 34ab316d7287 xen/pcifront: Drop pcifront_common_process() tests of pcidev, pdrv
> > 9f37ab0412eb PCI/switchtec: Add check of event support
> > 5a72431ec318 powerpc/eeh: Use dev_driver_string() instead of struct
> > pci_dev->driver->name
> > ae232f0970ea PCI: Drop pci_device_probe() test of !pci_dev->driver
> > 097d9d414433 PCI: Drop pci_device_remove() test of pci_dev->driver
> > 8e9028b3790d PCI: Return NULL for to_pci_driver(NULL)
> > 357df2fc0066 PCI: Use unsigned to match sscanf("%x") in pci_dev_str_match_path()
> > bf2928c7a284 PCI/VPD: Add pci_read/write_vpd_any()
> > b2105b9f39b5 PCI: Correct misspelled and remove duplicated words
> > 7c3855c423b1 PCI: Coalesce host bridge contiguous apertures
> > e0f7b1922358 PCI: Use kstrtobool() directly, sans strtobool() wrapper
> > 36f354ec7bf9 PCI/sysfs: Return -EINVAL consistently from "store" functions
> > 95e83e219d68 PCI/sysfs: Check CAP_SYS_ADMIN before parsing user input
> > af9d82626c8f PCI/ACPI: Remove OSC_PCI_SUPPORT_MASKS and OSC_PCI_CONTROL_MASKS
> > 9a0a1417d3bb PCI: Tidy comments
> > 06dc660e6eb8 PCI: Rename pcibios_add_device() to pcibios_device_add()
> > e3f4bd3462f6 PCI: Mark Atheros QCA6174 to avoid bus reset
> > 3a19407913e8 PCI/P2PDMA: Apply bus offset correctly in DMA address calculation
> >
> > Out of these, I agree that most of them seem harmless, these would
> > be the ones I'd try to look at more closely, or maybe revert for testing:
> >
> > 978fd0056e19 PCI: of: Allow matching of an interrupt-map local to a PCI device
> > 041284181226 of/irq: Allow matching of an interrupt-map local to an
> > interrupt controller
> > e1b0d0bb2032 PCI: Re-enable Downstream Port LTR after reset or hotplug
> > 7c3855c423b1 PCI: Coalesce host bridge contiguous apertures
> > 3a19407913e8 PCI/P2PDMA: Apply bus offset correctly in DMA address calculation
>
> Robert would you be able build a kernel without the patches Arnd singled
> out as potential curlprits?  Might be expidite some troubleshooting saving
> a lot of time doing bisect.
>
> I wonder if this will help you with the following problem:
>   https://lore.kernel.org/linux-pci/CAP145pjO9zdGgutHP=of0H+L1=nSz097zf73i7ZYm2-NWuwHhQ@mail.gmail.com/

Thanks.

I tried removing all of those (latest 5), and I had Windows/qemu boot
hangs with all of them removed.

But I cannot say for sure, because I did quite a mess with my
kernel/qemu setup, but with this code
https://github.com/torvalds/linux/commit/cb690f5238d71f543f4ce874aa59237cf53a877c
and with patch https://lkml.org/lkml/2021/11/9/836 my qemu/Win11 seems
to be booting again (even if dmesg is filled with pci-related errors
around initialization timeouts)

I think I'll try to concentrate on helping with the pic code in this
thread: https://lkml.org/lkml/2021/11/10/684 - and once it works well
with the host kernel, I'll try to figure out whether anything still
troubles the vfio/kvm code.

PS: I assumed you asked me to test it wrt my troubles with qemu/vfio/kvm/Win11.