On Tue, Aug 22, 2017 at 8:55 PM, Logan Gunthorpe <logang@xxxxxxxxxxxx> wrote: > On 22/08/17 11:40 AM, Andy Shevchenko wrote: >> Recomendation is kinda arguable. I doubt modern architectures make >> difference between IO operations and MMIO. >> Does, for example, PCI requires some special signal (message / wire) >> handling when pio_*() accessors used vs. mmio_*() ones? > Sort of. There is a difference between the two in x86. Yes, the difference is in signaling. The question is if it's still in use. Looks like yes... > But really if it's > not a valid recommendation someone should just go through and deprecate one > of them or document better when one should be used over the other. In any > case it's still really ugly to mix the two types in the same driver. Mixing is ugly, totally agree. -- With Best Regards, Andy Shevchenko
