On Wed, 29 Jun 2022 16:06:14 +1000, Alexey Kardashevskiy wrote:
> The pseries platform uses 32bit default DMA window (always 4K pages) and
> optional 64bit DMA window available via DDW ("Dynamic DMA Windows"),
> 64K or 2M pages. For ages the default one was not removed and a huge
> window was created in addition. Things changed with SRIOV-enabled
> PowerVM which creates a default-and-bigger DMA window in 64bit space
> (still using 4K pages) for IOV VFs so certain OSes do not need to use
> the DDW API in order to utilize all available TCE budget.
>
> [...]
Applied to powerpc/next.
[1/1] pseries/iommu/ddw: Fix kdump to work in absence of ibm,dma-window
https://git.kernel.org/powerpc/c/b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d
cheers
