[igt-dev] [PATCH i-g-t 3/9] lib/intel_batchbuffer: Add blitter copy using XY_SRC_COPY_BLT

[Imre Deak]

On Thu, Jan 30, 2020 at 10:26:28AM +0000, Chris Wilson wrote:
> Quoting Chris Wilson (2020-01-30 10:17:40)
> > Quoting Imre Deak (2020-01-29 18:15:55)
> > > +       if ((src_tiling | dst_tiling) >= I915_TILING_Y) {
> > > +               igt_assert(gen >= 6);
> > > +               batch[i++] = MI_FLUSH_DW | 2;
> > 
> > MI_FLUSH_DW is only 3 dwords on gen6, so
> > 
> > batch[i] = MI_FLUSH_DW | 1;
> > if (has_64b_reloc)
> >         batch[i]++;
> > i++;
> > 
> > or something prettier.
> 
> Actually, you can get away with MI_FLUSH_DW | 2 as that should indicate
> a qword write instead for gen6/7.

Ok, making it qword for gen6/7 and dword for gen8+.

--Imre