On Mon, Nov 29, 2021 at 11:36:37AM -0600, Rob Herring wrote:
Commit 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup") broke PCI support on XGene. The cause is the IB resources are now sorted in address order instead of being in DT dma-ranges order. The result is which inbound registers are used for each region are swapped. I don't know the details about this h/w, but it appears that IB region 0 registers can't handle a size greater than 4GB. In any case, limiting the size for region 0 is enough to get back to the original assignment of dma-ranges to regions.
hey Rob!
I've been seeing a panic on HP Moonshoot m400 cartridges (X-Gene1) - only during network installs - that I also bisected down to commit 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup"). I was hoping that this patch that fixed the issue on Stéphane's X-Gene2 system would also fix my issue, but no luck. In fact, it seems to just makes it fail differently. Reverting both patches is required to get a v5.17-rc kernel to boot.
I've collected the following logs - let me know if anything else would be useful.
1) v5.17-rc2+ (unmodified): http://dannf.org/bugs/m400-no-reverts.log Note that the mlx4 driver fails initialization.
2) v5.17-rc2+, w/o the commit that fixed Stéphane's system: http://dannf.org/bugs/m400-xgene2-fix-reverted.log Note the mlx4 MSI-X timeout, and later panic.
3) v5.17-rc2+, w/ both commits reverted (works) http://dannf.org/bugs/m400-both-reverted.log
-dann