linux-kernel - Re: use generic DMA mapping code in powerpc V4

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Date:   Fri, 8 Feb 2019 10:01:46 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Christoph Hellwig <hch@....de>
Cc:     linux-arch@...r.kernel.org,
        Darren Stevens <darren@...vens-zone.net>,
        linux-kernel@...r.kernel.org, Julian Margetson <runaway@...dw.ms>,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Paul Mackerras <paulus@...ba.org>,
        Olof Johansson <olof@...om.net>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: use generic DMA mapping code in powerpc V4

Hi Christoph,

Your new patch fixes the problems with the P.A. Semi Ethernet! :-)

Thanks,
Christian


On 07 February 2019 at 05:34AM, Christian Zigotzky wrote:
> Hi Christoph,
>
> I also didn’t notice the 32-bit DMA mask in your patch. I have to read your patches and descriptions carefully in the future. I will test your new patch at the weekend.
>
> Thanks,
> Christian
>
> Sent from my iPhone
>
>> On 6. Feb 2019, at 16:16, Christoph Hellwig <hch@....de> wrote:
>>
>>> On Wed, Feb 06, 2019 at 04:15:05PM +0100, Christoph Hellwig wrote:
>>> The last good one was 29e7e2287e196f48fe5d2a6e017617723ea979bf
>>> ("dma-direct: we might need GFP_DMA for 32-bit dma masks"), if I
>>> remember correctly.  powerpc/dma: use the dma_direct mapping routines
>>> was the one that you said makes the pasemi ethernet stop working.
>>>
>>> Can you post the dmesg from the failing runs?
>> But I just noticed I sent you a wrong patch - the pasemi ethernet
>> should set a 64-bit DMA mask, not 32-bit.  Updated version below,
>> 32-bit would just keep the previous status quo.
>>
>> commit 6c8f88045dee35933337b9ce2ea5371eee37073a
>> Author: Christoph Hellwig <hch@....de>
>> Date:   Mon Feb 4 13:38:22 2019 +0100
>>
>>     pasemi WIP
>>
>> diff --git a/drivers/net/ethernet/pasemi/pasemi_mac.c b/drivers/net/ethernet/pasemi/pasemi_mac.c
>> index 8a31a02c9f47..2d7d1589490a 100644
>> --- a/drivers/net/ethernet/pasemi/pasemi_mac.c
>> +++ b/drivers/net/ethernet/pasemi/pasemi_mac.c
>> @@ -1716,6 +1716,7 @@ pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>>         err = -ENODEV;
>>         goto out;
>>     }
>> +    dma_set_mask(&mac->dma_pdev->dev, DMA_BIT_MASK(64));
>>
>>     mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
>>     if (!mac->iob_pdev) {