Hi Christoph,
On 9/22/26 14:20, Christoph Hellwig wrote:
On Mon, Sep 21, 2026 at 02:38:50PM +0100, Pavel Begunkov wrote:
Enable BIO_DMABUF_MAP backed requests. On registration we map the
This is now REQ_DMABUF.
Will change
Sashiko had a few comments, which I think are correct - if we use
dma_map_sg to map the data, we need to use the sync_sg APIs to
transfer ownership. That only matters on non-coherent architectures
with MMU, but we need to get it right.
I've seen that and fixed everything locally that should be fixed,
apart from the sync. I wonder what we can do about that? I can
somehow replace it with the sg variant for now, but sync'ing the
entire possibly multi-GB mapping for, let's say, a 512B I/O, sounds
not wise. And I can think of another place that does mix sync_single
with sgs.
And the reset deadlock also looks plausible.
--
Pavel Begunkov
