On Fri, 28 Aug 2020 at 00:34, Tom Murphy <murph...@tcd.ie> wrote: > > On Thu, 27 Aug 2020 at 22:36, Logan Gunthorpe <log...@deltatee.com> wrote: > > > > > > > > On 2020-08-23 6:04 p.m., Tom Murphy wrote: > > > I have added a check for the sg_dma_len == 0 : > > > """ > > > } __sgt_iter(struct scatterlist *sgl, bool dma) { > > > struct sgt_iter s = { .sgp = sgl }; > > > > > > + if (sgl && sg_dma_len(sgl) == 0) > > > + s.sgp = NULL; > > > > > > if (s.sgp) { > > > ..... > > > """ > > > at location [1]. > > > but it doens't fix the problem. > > > > Based on my read of the code, it looks like we also need to change usage > > of sgl->length... Something like the rough patch below, maybe? > > > > Also, Tom, do you have an updated version of the patchset to convert the > > Intel IOMMU to dma-iommu available? The last one I've found doesn't > > apply cleanly (I'm assuming parts of it have been merged in slightly > > modified forms). > > > > I'll try and post one in the next 24hours
I have just posted this now: The subject of the cover letter is: "[PATCH V2 0/5] Convert the intel iommu driver to the dma-iommu api" > > > Thanks, > > > > Logan > > > > -- > > > > diff --git a/drivers/gpu/drm/i915/i915_scatterlist.h > > b/drivers/gpu/drm/i915/i915 > > index b7b59328cb76..9367ac801f0c 100644 > > --- a/drivers/gpu/drm/i915/i915_scatterlist.h > > +++ b/drivers/gpu/drm/i915/i915_scatterlist.h > > @@ -27,13 +27,19 @@ static __always_inline struct sgt_iter { > > } __sgt_iter(struct scatterlist *sgl, bool dma) { > > struct sgt_iter s = { .sgp = sgl }; > > > > + if (sgl && !sg_dma_len(s.sgp)) > > + s.sgp = NULL; > > + > > if (s.sgp) { > > s.max = s.curr = s.sgp->offset; > > - s.max += s.sgp->length; > > - if (dma) > > + > > + if (dma) { > > + s.max += sg_dma_len(s.sgp); > > s.dma = sg_dma_address(s.sgp); > > - else > > + } else { > > + s.max += s.sgp->length; > > s.pfn = page_to_pfn(sg_page(s.sgp)); > > + } > > } > > > > return s;