From: Jérôme Glisse jglisse@redhat.com
[This depends on some HMM patchset queued upstream see branch [1]]
This is simple change to switch to use HMM for user ptr buffer object which conveniently avoid to pin pages. I have more things in the pipe to make HMM more usefull for such cases (like sharing more resources accross multiple mirror of a same process).
Beside avoiding pining, this is also an attempt to isolate core mm from device drivers by having clearly define API and boundary where we can set expection of everyone and thus having mm folks to have to read and understand driver code and conversly having driver folks understand mm maze.
This is also part of what i want to discuss during XDC2018.
Consider this as an RFC to start the discussion.
[1] https://cgit.freedesktop.org/~glisse/linux/log/?h=hmm-radeon-v00
Cc: dri-devel@lists.freedesktop.org Cc: Alex Deucher alexander.deucher@amd.com Cc: Christian König christian.koenig@amd.com Cc: Felix Kuehling Felix.Kuehling@amd.com Cc: David (ChunMing) Zhou David1.Zhou@amd.com Cc: Nicolai Hähnle nicolai.haehnle@amd.com Cc: amd-gfx@lists.freedesktop.org Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel.vetter@ffwll.ch
Jérôme Glisse (2): gpu/radeon: use HMM mirror instead of mmu_notifier gpu/radeon: use HMM mirror for userptr buffer object.
drivers/gpu/drm/radeon/radeon.h | 14 +- drivers/gpu/drm/radeon/radeon_gem.c | 16 +- drivers/gpu/drm/radeon/radeon_mn.c | 283 +++++++++++++++++++++------- drivers/gpu/drm/radeon/radeon_ttm.c | 129 ++----------- 4 files changed, 259 insertions(+), 183 deletions(-)