linux-kernel - Re: [PATCH 4/5] sparc64/pci_sun4v: allow large DMA masks

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Message-Id: <20190215.103531.2177713502969625146.davem@davemloft.net>
Date:   Fri, 15 Feb 2019 10:35:31 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     hch@....de
Cc:     deller@....de, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, sparclinux@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] sparc64/pci_sun4v: allow large DMA masks

From: Christoph Hellwig <hch@....de>
Date: Fri, 15 Feb 2019 15:45:58 +0100

> We've been moving to a model where the device just sets the DMA mask
> supported by it, instead of having to fallback to something it thinks
> the platform might support.  Sparc64 is the remaining holdout forcing
> drivers to supply a matching mask.  Change dma_4v_supported to just
> check if the supplied dma mask is large enough. and adjust the mapping
> code to check ATU presence in addition to the DMA mask to decice on
                                                            ^^^^^^

"decide"

> the mapping method.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Acked-by: David S. Miller <davem@...emloft.net>