linux-kernel - Re: [PATCH 1/1] powerpc/kernel/iommu: Use largepool as a last resort when !largealloc

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Message-Id: <161970488610.4033873.6555670052413265008.b4-ty@ellerman.id.au>
Date:   Fri, 30 Apr 2021 00:01:26 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Alexey Kardashevskiy <aik@...abs.ru>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Leonardo Bras <leobras.c@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/1] powerpc/kernel/iommu: Use largepool as a last resort when !largealloc

On Thu, 18 Mar 2021 14:44:17 -0300, Leonardo Bras wrote:
> As of today, doing iommu_range_alloc() only for !largealloc (npages <= 15)
> will only be able to use 3/4 of the available pages, given pages on
> largepool  not being available for !largealloc.
> 
> This could mean some drivers not being able to fully use all the available
> pages for the DMA window.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/kernel/iommu: Use largepool as a last resort when !largealloc
      https://git.kernel.org/powerpc/c/fc5590fd56c9608f317729b59a56dad2a75d633f

cheers