Hi, On Sun, Feb 27, 2022 at 12:12 PM Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> wrote: ... > > I think the right thing to do right now is to verify that we indeed > have a general issue and not something specific to one singular > platform > So the question becomes - do indeed the DMA api forbits aliased > mappings and if so, under what conditions? > > Any ideas on how to check this? OK, I've looked into this further and I think I was wrong. The DMA api doesn't like overlapping writable mappings, but it seems an overlapping read-only and writable mapping are fine. If so I can indeed resolve this in the driver code by better specifying DMA direction. Let me give this a go and let's drop this patch in the meantime. Thank you and sorry for the noise. Gilad -- Gilad Ben-Yossef Chief Coffee Drinker values of β will give rise to dom!
