linux-kernel - Re: [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"

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Date:   Fri, 23 Dec 2022 21:10:39 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux.dev
Subject: Re: [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap
 metadata region before/after use"

On Fri, Dec 23, 2022 at 03:57:22PM +0100, Christoph Hellwig wrote:
> On Fri, Dec 23, 2022 at 08:17:31PM +0530, Manivannan Sadhasivam wrote:
> > Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> 
> Btw, if the hardware really does not like a kernel mapping, the
> right way is to just keep using the normal dma allocator, but make
> sure that there shared-dma-pool with the no-map property for the
> device.

Sibi posted a series that uses a separate no-map carveout for this usecase:
https://lore.kernel.org/lkml/20221213140724.8612-1-quic_sibis@quicinc.com/

But that doesn't use dma allocator with shared-dma-pool.

Thanks,
Mani

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