linux-kernel - Re: [PATCH 1/1] powerpc/kernel/iommu: Align size for IOMMU_PAGE

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Message-Id: <161970488591.4033873.12136899463811308450.b4-ty@ellerman.id.au>
Date:   Fri, 30 Apr 2021 00:01:25 +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: Align size for IOMMU_PAGE_SIZE() to save TCEs

On Thu, 18 Mar 2021 14:44:14 -0300, Leonardo Bras wrote:
> Currently both iommu_alloc_coherent() and iommu_free_coherent() align the
> desired allocation size to PAGE_SIZE, and gets system pages and IOMMU
> mappings (TCEs) for that value.
> 
> When IOMMU_PAGE_SIZE < PAGE_SIZE, this behavior may cause unnecessary
> TCEs to be created for mapping the whole system page.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs
      https://git.kernel.org/powerpc/c/3c0468d4451eb6b4f6604370639f163f9637a479

cheers