Re: [PATCH kernel v2 0/2] powerpc/ioda2: Another attempt to allow DMA masks between 32 and 59

[Alistair Popple <alistair@popple.id.au>]

Hi Alexey,

Do we need a seperate patch to allow this to be used? Last time I tried 
calling dma_set_mask(52) on powernv it returned an error and there doesn't 
seem to be anything obvious to me in this series to change that behaviour, but 
perhaps I missed something.

- Alistair

On Wednesday, 1 May 2019 3:28:20 PM AEST Alexey Kardashevskiy wrote:
> This is an attempt to allow DMA masks between 32..59 which are not large
> enough to use either a PHB3 bypass mode or a sketchy bypass. Depending
> on the max order, up to 40 is usually available.
> 
> 
> This is based on sha1
> 37624b58542f Linus Torvalds "Linux 5.1-rc7".
> 
> Please comment. Thanks.
> 
> 
> 
> Alexey Kardashevskiy (2):
>   powerpc/powernv/ioda2: Allocate TCE table levels on demand for default
>     DMA window
>   powerpc/powernv/ioda2: Create bigger default window with 64k IOMMU
>     pages
> 
>  arch/powerpc/include/asm/iommu.h              |  8 ++-
>  arch/powerpc/platforms/powernv/pci.h          |  2 +-
>  arch/powerpc/kernel/iommu.c                   | 58 +++++++++++++------
>  arch/powerpc/platforms/powernv/pci-ioda-tce.c | 20 +++----
>  arch/powerpc/platforms/powernv/pci-ioda.c     | 40 +++++++++++--
>  5 files changed, 90 insertions(+), 38 deletions(-)