drm/nouveau/ttm: wait for bo fence to signal before unmapping vmas

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commit 10dcab3e7f upstream.

TTM was changed a while back to allow for pipelining of buffer moves, and
part of this was the removal of waiting for a BO to idle before calling
move(), placing the responsibility on the driver to do this if required.

That's all well and good, except, we make use of move_notify() to handle
mapping/unmapping from the GPU VMM as move() isn't called on all paths.

This commit adds a wait before unmapping from a VMM in move_notify(), to
prevent GPU page faults where a buffer is still being accessed.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ben Skeggs 2016-12-12 17:52:45 +10:00 • committed by Greg Kroah-Hartman

parent a5b4c77c92

commit bfa563bae2

1 changed files with 1 additions and 0 deletions

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drivers/gpu/drm/nouveau/nouveau_bo.c

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