linux-kernel - Re: [PATCH 1/1] powerpc/pseries/iommu: Fix window size for direct mapping with pmem

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Date:   Wed, 21 Apr 2021 23:08:21 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Leonardo Bras <leobras.c@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] powerpc/pseries/iommu: Fix window size for direct mapping with pmem

On Tue, 20 Apr 2021 01:54:04 -0300, Leonardo Bras wrote:
> As of today, if the DDW is big enough to fit (1 << MAX_PHYSMEM_BITS) it's
> possible to use direct DMA mapping even with pmem region.
> 
> But, if that happens, the window size (len) is set to
> (MAX_PHYSMEM_BITS - page_shift) instead of MAX_PHYSMEM_BITS, causing a
> pagesize times smaller DDW to be created, being insufficient for correct
> usage.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/pseries/iommu: Fix window size for direct mapping with pmem
      https://git.kernel.org/powerpc/c/a9d2f9bb225fd2a764aef57738ab6c7f38d782ae

cheers