linux-kernel - Re: [PATCH] iommu/dma: Resurrect the "forcedac" option

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Date:   Thu, 18 Mar 2021 10:55:44 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        baolu.lu@...ux.intel.com, murphyt7@....ie, john.garry@...wei.com,
        thunder.leizhen@...wei.com, will@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/dma: Resurrect the "forcedac" option

On Fri, Mar 05, 2021 at 04:32:34PM +0000, Robin Murphy wrote:
> In converting intel-iommu over to the common IOMMU DMA ops, it quietly
> lost the functionality of its "forcedac" option. Since this is a handy
> thing both for testing and for performance optimisation on certain
> platforms, reimplement it under the common IOMMU parameter namespace.
> 
> For the sake of fixing the inadvertent breakage of the Intel-specific
> parameter, remove the dmar_forcedac remnants and hook it up as an alias
> while documenting the transition to the new common parameter.
> 
> Fixes: c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 15 ++++++++-------
>  drivers/iommu/dma-iommu.c                       | 13 ++++++++++++-
>  drivers/iommu/intel/iommu.c                     |  5 ++---
>  include/linux/dma-iommu.h                       |  2 ++
>  4 files changed, 24 insertions(+), 11 deletions(-)

Applied for v5.13, thanks.