On Wed, 2016-27-07 at 14:41:29 UTC, Darren Stevens wrote:

Commit 817820b0226a ("powerpc/iommu: Support "hybrid" iommu/direct DMA
    ops for coherent_mask < dma_mask) adds a check of coherent_dma_mask
    for dma allocations.
    Unfortunately current PASemi code does not set this value for the DMA
    engine, which ends up with the default value of 0xffffffff, the result 
    is on a PASemi system with >2Gb ram and iommu enabled the the onboard 
    ethernet stops working due to an inability to allocate memory.
    Add an initialisation to pci_dma_dev_setup_pasemi()
  
    Signed-off-by: Darren Stevens [off-list ref]

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/416f37d0816b9720b8227953e5

cheers