linux-kernel - Re: [RFC 1/6] s390/ism: Set DMA coherent mask

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Message-ID: <ca76170852152cb9fef207a16b39b67035e5bd28.camel@linux.ibm.com>
Date:   Thu, 20 Oct 2022 14:16:23 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Matthew Rosato <mjrosato@...ux.ibm.com>, iommu@...ts.linux.dev,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>,
        linux-s390@...r.kernel.org, borntraeger@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, linux-kernel@...r.kernel.org,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Julian Ruess <julianr@...ux.ibm.com>
Subject: Re: [RFC 1/6] s390/ism: Set DMA coherent mask

On Thu, 2022-10-20 at 01:07 -0700, Christoph Hellwig wrote:
> On Wed, Oct 19, 2022 at 04:44:30PM +0200, Niklas Schnelle wrote:
> >  	if (ret)
> >  		goto err_resource;
> >  
> > +	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
> 
> Nit:  but you could also just replace the call to dma_set_mask abobe with
> a call to dma_set_mask_and_coherent.

That makes sense, thanks. Will be added for v2. Also obviously this
change is only a prerequisite and could be applied separately, the
changed coherent mask won't affect use with the existing DMA
implementation.