On Mon, May 17, 2021 at 04:09:42PM +0300, Serge Belyshev wrote: > Christoph Hellwig <hch@xxxxxx> writes: > > > As an ad-hoc experiment: can you replace the call to remap_pfn_range > > with remap_pfn_range_notrack (and export it if you build i915 modular) > > in remap_io_sg and see if that makes any difference? > > That worked, thanks -- no artifacts seen. Looks like it is caused by the validation failure then. Which means the existing code is doing something wrong in its choice of the page protection bit. I really need help from the i915 maintainers here..
