On Tue, Jun 09, 2020 at 01:38:46PM +0200, Takashi Iwai wrote:
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.
So it looks like we could just turn off CONFIG_SND_DMA_SGBUF and be done with it? After all this works on other architectures just fine..