linux-kernel - Re: ehci-pci breakage with dma-mapping changes in 5.4-rc2

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Message-ID: <20191007183206.GA13589@rani.riverdale.lan>
Date:   Mon, 7 Oct 2019 14:32:07 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org
Subject: Re: ehci-pci breakage with dma-mapping changes in 5.4-rc2

On Mon, Oct 07, 2019 at 01:58:57PM -0400, Arvind Sankar wrote:
> On Mon, Oct 07, 2019 at 10:56:30AM -0700, Christoph Hellwig wrote:
> > On Mon, Oct 07, 2019 at 07:55:28PM +0200, Christoph Hellwig wrote:
> > > On Mon, Oct 07, 2019 at 01:54:32PM -0400, Arvind Sankar wrote:
> > > > It doesn't boot with the patch. Won't it go
> > > > 	dma_get_required_mask
> > > > 	-> intel_get_required_mask
> > > > 	-> iommu_need_mapping
> > > > 	-> dma_get_required_mask
> > > > ?
> > > > 
> > > > Should the call to dma_get_required_mask in iommu_need_mapping be
> > > > replaced with dma_direct_get_required_mask on top of your patch?
> > > 
> > > Yes, sorry.
> > 
> > Actually my patch already calls dma_direct_get_required_mask.
> > How did you get the loop?
> 
> The function iommu_need_mapping (not changed by your patch) calls
> dma_get_required_mask internally, to check whether the device's dma_mask
> is big enough or not. That's the call I was asking whether it needs to
> be changed.

Yeah the attached patch seems to fix it.

View attachment "0001-iommu-vt-d-Return-the-correct-dma-mask-when-we-are-b.patch" of type "text/x-diff" (1905 bytes)