On 13/07/2020 06:09, Dave Airlie wrote:
On Fri, 10 Jul 2020 at 22:00, Matthew Auld <matthew.auld@xxxxxxxxx> wrote:
We need to add support for pwrite'ing an LMEM object.
why? DG1 is a discrete GPU, these interfaces we already gross and
overly hacky for integrated, I'd prefer not to drag them across into
discrete land.
same goes for pread.
You have no legacy userspace here, userspace needs change to support
LMEM, it can be fixed to avoid legacy ioctls paths.
Ok, there have also been similar discussions internally in the past. I
think one of the reasons was around IGT, and how keeping the
pread/pwrite interface meant slightly less pain, also it's not much
effort to implement for LMEM. If this is a NACK, then I guess the other
idea was to somehow fallback to mmap and update IGT accordingly.
Dave.
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