On Fri, 2018-06-01 at 08:06:16 UTC, Alexey Kardashevskiy wrote: > We use PHB in mode1 which uses bit 59 to select a correct DMA window. > However there is mode2 which uses bits 59:55 and allows up to 32 DMA > windows per a PE. > > Even though documentation does not clearly specify that, it seems that > the actual hardware does not support bits 59:55 even in mode1, in other > words we can create a window as big as 1<<58 but DMA simply won't work. > > This reduces the upper limit from 59 to 55 bits to let the userspace know > about the hardware limits. > > Fixes: 7aafac11e3 "powerpc/powernv/ioda2: Gracefully fail if too many TCE > levels requested" > Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/d3d4ffaae439981e1e441ebb125aa3 cheers
