commit 7ffb791423c7 breaks steam game

[Christian König]

Am 25.03.25 um 00:07 schrieb Bert Karwatzki:
> Here's the dmesg from linux-next-6.14-rc7-next20250321 (CONFIG_PCI_P2PDMA not set)
> The memory ranges of (afe00000000-affffffffff) or (3ffe00000000-3fffffffffff) are
> mentioned in neither of them.

Ugh, next time either in two mails or as attachment please. I had to separate the logs manually again.

The BIOS programs multiple root PCIe resources:
[    0.310962] [      T1] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000dffff window]
[    0.310963] [      T1] pci_bus 0000:00: root bus resource [mem 0xf0000000-0xfcffffff window]
[    0.310965] [      T1] pci_bus 0000:00: root bus resource [mem 0x1010000000-0xffffffffff window]

But by default all BARs end up in the 0xf0000000-0xfcffffff window and are so accessible to the iGPU.

So I don't see a reason why dma_addressing_limited() should return true.

Regards,
Christian.
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