linux-kernel - Re: [PATCH v2] iommu: map reserved memory as cacheable if device is coherent

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Message-ID: <ZQrGyqQ7K96PFXQ1@orome>
Date:   Wed, 20 Sep 2023 12:17:46 +0200
From:   Thierry Reding <treding@...dia.com>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     joro@...tes.org, will@...nel.org, robin.murphy@....com,
        jgg@...dia.com, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iommu: map reserved memory as cacheable if device is
 coherent

On Thu, Sep 14, 2023 at 03:52:58PM +0300, Laurentiu Tudor wrote:
> Check if the device is marked as DMA coherent in the DT and if so,
> map its reserved memory as cacheable in the IOMMU.
> This fixes the recently added IOMMU reserved memory support which
> uses IOMMU_RESV_DIRECT without properly building the PROT for the
> mapping.
> 
> Fixes: a5bf3cfce8cb ("iommu: Implement of_iommu_get_resv_regions()")
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> ---
> Changes in v2:
>  - added Reviewed-by tag
> 
>  drivers/iommu/of_iommu.c | 3 +++
>  1 file changed, 3 insertions(+)

Acked-by: Thierry Reding <treding@...dia.com>

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