linux-kernel - RE: [PATCH v2 1/3] dma-mapping: introduce new dma unmap and sync api variants

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Message-ID: <VI1PR04MB51340164BACC952498E46FFDEC610@VI1PR04MB5134.eurprd04.prod.outlook.com>
Date:   Tue, 29 Oct 2019 07:05:36 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     "hch@....de" <hch@....de>
CC:     "joro@...tes.org" <joro@...tes.org>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Leo Li <leoyang.li@....com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        Diana Madalina Craciun <diana.craciun@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Madalin Bucur <madalin.bucur@....com>
Subject: RE: [PATCH v2 1/3] dma-mapping: introduce new dma unmap and sync api
 variants



> -----Original Message-----
> From: hch@....de <hch@....de>
> Sent: Monday, October 28, 2019 2:38 PM
> 
> On Thu, Oct 24, 2019 at 12:41:41PM +0000, Laurentiu Tudor wrote:
> > From: Laurentiu Tudor <laurentiu.tudor@....com>
> >
> > Introduce a few new dma unmap and sync variants that, on top of the
> > original variants, return the virtual address corresponding to the
> > input dma address.
> > In order to implement this a new dma map op is added and used:
> >     void *get_virt_addr(dev, dma_handle);
> > It does the actual conversion of an input dma address to the output
> > virtual address.
> 
> We'll definitively need an implementation for dma-direct at least as
> well.  Also as said previously we need a dma_can_unmap_by_dma_addr()
> or similar helper that tells the driver beforehand if this works, so
> that the driver can either use a sub-optimal workaround or fail the
> probe if this functionality isn't implemented.

Alright. On top of that I need to make this work on booke ppc as we have one driver that runs both on arm and ppc and will use these APIs.

---
Best Regards, Laurentiu