On Tue, 09 Jun 2020 13:31:23 +0200, Christoph Hellwig wrote: > > On Tue, Jun 09, 2020 at 11:31:20AM +0200, Takashi Iwai wrote: > > > > How would be a proper way to get the virtually mapped SG-buffer pages > > > > with coherent memory? (Also allowing user-space mmap, too) > > > > > > dma_mmap_coherent / dma_mmap_attrs for userspace. We don't really > > > have a good way for kernel space mappings. > > > > And that's the missing piece right now... :-< > > Can you point me to the relevant places (allocation and vmap mostly) > so that I can take a look at how to fix this mess? Found in sound/core/sgbuf.c. It's specific to x86. Also, for V4L, drivers/media/v4l2-core/videobuf-dma-sg.c. thanks, Takashi
