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Subject: Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook
To: Aaro Koskinen <aaro.koskinen@iki.fi>
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From: Larry Finger <Larry.Finger@lwfinger.net>
Message-ID: <74c8af35-6006-5ca8-0fe4-b5938b1139ff@lwfinger.net>
Date: Tue, 11 Jun 2019 20:57:34 -0500
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Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
 Christian Zigotzky <chzigotzky@xenosoft.de>, linuxppc-dev@lists.ozlabs.org,
 Christoph Hellwig <hch@lst.de>
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On 6/11/19 5:46 PM, Aaro Koskinen wrote:
> Hi,
> 
> On Tue, Jun 11, 2019 at 05:20:12PM -0500, Larry Finger wrote:
>> It is obvious that the case of a mask smaller than min_mask should be
>> handled by the IOMMU. In my system, CONFIG_IOMMU_SUPPORT is selected. All
>> other CONFIG variables containing IOMMU are not selected. When
>> dma_direct_supported() fails, should the system not try for an IOMMU
>> solution? Is the driver asking for the wrong type of memory? It is doing a
>> dma_and_set_mask_coherent() call.
> 
> I don't think we have IOMMU on G4. On G5 it should work (I remember fixing
> b43 issue on G5, see 4c374af5fdee, unfortunately all my G5 Macs with b43
> are dead and waiting for re-capping).

You are right. My configuration has CONFIG_IOMMU_SUPPORT=y, but there is no 
mention of an IOMMU in the log.

Larry