On Wed, Aug 07, 2019 at 10:55:01AM +0000, Koenig, Christian wrote: > >> Essentially writeq/readq doesn't seems to be available on all > >> architectures either. > > writeq/readq are provided whenever the CPU actually supports 64-bit > > atomic loads and stores. > > Is there a config option which we can make the driver depend on? > > I mean that ARM doesn't support 64bit atomic loads and stores on MMIO is > quite a boomer for us. The model is to cheack if readq/writeq are defined, and if not to include the one of io-64-nonatomic-hi-lo.h or io-64-nonatomic-lo-hi.h. The reason for that is that hardware is supposed to be able to deal with two 32-bit writes, but it depends on the hardware if the lower or upper half is what commits the write. The only 32-bit platform that claims support for readq/writeq is sh, and I have doubts if that actually works as expected. _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
