linux-kernel - Re: [PATCH v7 0/5] prerequisites for device reserved local mem rework

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Message-ID: <014526bf-e3e9-bd94-a239-0ec1e7feaf72@nxp.com>
Date:   Tue, 4 Jun 2019 14:16:11 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Christoph Hellwig <hch@....de>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "marex@...x.de" <marex@...x.de>, Leo Li <leoyang.li@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "noring@...rew.org" <noring@...rew.org>,
        "JuergenUrban@....de" <JuergenUrban@....de>
Subject: Re: [PATCH v7 0/5] prerequisites for device reserved local mem rework

On 31.05.2019 19:43, Christoph Hellwig wrote:
> On Wed, May 29, 2019 at 02:06:12PM +0000, Laurentiu Tudor wrote:
>> Thanks, hope this time everything is fine.
> 
> I've applied it to the dma-mapping tree now.
> 
>> When you get the time, please let me know your ideas on the next steps.
> 
> I think the next step is to move the call to
> dma_alloc_from_dev_coherent from dma_alloc_attrs into the ->alloc
> instances.  The only onces that really need it for now are the
> generic and legacy arm dma-direct code, and drivers/iommu/dma-iommu.c
> as well as the ARM DMA API code, as those are the ones use for
> architectures that declare coherent regions.  The other iommus are
> not used on OF platforms (at least that's what my analysis said a while
> ago, feel free to double check it)

Thanks for the details. I'll be OOO next week so probably I'll start 
looking into it next next week.

---
Best Regards, Laurentiu