On 29.03.24 06:38, Kasireddy, Vivek wrote:
Hi David,
On 25.02.24 08:56, Vivek Kasireddy wrote:
Currently, some drivers (e.g, Udmabuf) that want to longterm-pin
the pages/folios associated with a memfd, do so by simply taking a
reference on them. This is not desirable because the pages/folios
may reside in Movable zone or CMA block.
Therefore, having drivers use memfd_pin_folios() API ensures that
the folios are appropriately pinned via FOLL_PIN for longterm DMA.
This patchset also introduces a few helpers and converts the Udmabuf
driver to use folios and memfd_pin_folios() API to longterm-pin
the folios for DMA. Two new Udmabuf selftests are also included to
test the driver and the new API.
---
Sorry Vivek, I got distracted. What's the state of this? I assume it's
not in an mm tree yet.
No problem. Right, they are not in any tree yet. The first two mm patches that
add the unpin_folios() and check_and_migrate_movable_folios() helpers still
need to be reviewed.
I try to get this reviewed this week. If I fail to do that, please ping me.
Ok, sounds good!
.. as it's already Friday (and even a public Holiday today+Monday here),
let me prioritize this for next week!
--
Cheers,
David / dhildenb
