Re: [PATCH v4] PCI: of: Clear 64-bit flag for non-prefetchable memory below 4GB

[Rob Herring]

On Mon, Jun 14, 2021 at 5:05 PM Punit Agrawal <punitagrawal@xxxxxxxxx> wrote:
>
> Alexandru and Qu reported this resource allocation failure on
> ROCKPro64 v2 and ROCK Pi 4B, both based on the RK3399:
>
>   pci_bus 0000:00: root bus resource [mem 0xfa000000-0xfbdfffff 64bit]
>   pci 0000:00:00.0: PCI bridge to [bus 01]
>   pci 0000:00:00.0: BAR 14: no space for [mem size 0x00100000]
>   pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00003fff 64bit]
>
> "BAR 14" is the PCI bridge's 32-bit non-prefetchable window, and our
> PCI allocation code isn't smart enough to allocate it in a host
> bridge window marked as 64-bit, even though this should work fine.
>
> A DT host bridge description includes the windows from the CPU
> address space to the PCI bus space.  On a few architectures
> (microblaze, powerpc, sparc), the DT may also describe PCI devices
> themselves, including their BARs.
>
> Before 9d57e61bf723 ("of/pci: Add IORESOURCE_MEM_64 to resource
> flags for 64-bit memory addresses"), of_bus_pci_get_flags() ignored
> the fact that some DT addresses described 64-bit windows and BARs.
> That was a problem because the virtio virtual NIC has a 32-bit BAR
> and a 64-bit BAR, and the driver couldn't distinguish them.
>
> 9d57e61bf723 set IORESOURCE_MEM_64 for those 64-bit DT ranges, which
> fixed the virtio driver.  But it also set IORESOURCE_MEM_64 for host
> bridge windows, which exposed the fact that the PCI allocator isn't
> smart enough to put 32-bit resources in those 64-bit windows.
>
> Clear IORESOURCE_MEM_64 from host bridge windows since we don't need
> that information.
>
> Fixes: 9d57e61bf723 ("of/pci: Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses")
> Reported-at: https://lore.kernel.org/lkml/7a1e2ebc-f7d8-8431-d844-41a9c36a8911@xxxxxxx/
> Reported-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
> Reported-by: Qu Wenruo <wqu@xxxxxxxx>
> Suggested-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Signed-off-by: Punit Agrawal <punitagrawal@xxxxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>

I think we've beat this one to death.

Reviewed-by: Rob Herring <robh@xxxxxxxxxx>