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

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To: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Subject: Re: [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"
From: Christoph Hellwig <hch@xxxxxx>
Date: Fri, 23 Dec 2022 15:57:22 +0100
Cc: Christoph Hellwig <hch@xxxxxx>, Andy Gross <agross@xxxxxxxxxx>, Bjorn Andersson <andersson@xxxxxxxxxx>, Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>, Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Uladzislau Rezki <urezki@xxxxxxxxx>, linux-arm-msm@xxxxxxxxxxxxxxx, linux-remoteproc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, iommu@xxxxxxxxxxxxxxx
In-reply-to: <20221223144731.GA4587@thinkpad>
References: <20221223092703.61927-1-hch@lst.de> <20221223092703.61927-2-hch@lst.de> <20221223144731.GA4587@thinkpad>
User-agent: Mutt/1.5.17 (2007-11-01)

On Fri, Dec 23, 2022 at 08:17:31PM +0530, Manivannan Sadhasivam wrote:
> Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>

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.

Follow-Ups:
- Re: [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"
  - From: Manivannan Sadhasivam

References:
- revert dma-mapping and vmap API abuse in qcom_q6v5_mss
  - From: Christoph Hellwig
- [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"
  - From: Christoph Hellwig
- Re: [PATCH 1/2] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"
  - From: Manivannan Sadhasivam

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