linux-kernel - Re: WARNING in dma_map_page

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Date:   Tue, 27 Oct 2020 09:11:03 +0100
From:   "hch@....de" <hch@....de>
To:     Parav Pandit <parav@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        syzbot <syzbot+34dc2fea3478e659af01@...kaller.appspotmail.com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "hch@....de" <hch@....de>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linaro-mm-sig-owner@...ts.linaro.org" 
        <linaro-mm-sig-owner@...ts.linaro.org>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: WARNING in dma_map_page_attrs

On Mon, Oct 26, 2020 at 05:23:48AM +0000, Parav Pandit wrote:
> Hi Christoph,
> 
> > From: Jakub Kicinski <kuba@...nel.org>
> > Sent: Saturday, October 24, 2020 11:45 PM
> > 
> > CC: rdma, looks like rdma from the stack trace
> > 
> > On Fri, 23 Oct 2020 20:07:17 -0700 syzbot wrote:
> > > syzbot has found a reproducer for the following issue on:
> > >
> > > HEAD commit:    3cb12d27 Merge tag 'net-5.10-rc1' of git://git.kernel.org/..
> 
> In [1] you mentioned that dma_mask should not be set for dma_virt_ops.
> So patch [2] removed it.
>
> But check to validate the dma mask for all dma_ops was added in [3].
> 
> What is the right way? Did I misunderstood your comment about dma_mask in [1]?

No, I did not say we don't need the mask.  I said copying over the
various dma-related fields from the parent is bogus.

I think rxe (and ther other drivers/infiniband/sw drivers) need a simple
dma_coerce_mask_and_coherent and nothing else.