drm/nouveau/bar/gf100: fix access to upper half of BAR2
authorBen Skeggs <bskeggs@redhat.com>
Tue, 25 Jul 2017 01:06:47 +0000 (11:06 +1000)
committerBen Skeggs <bskeggs@redhat.com>
Tue, 25 Jul 2017 05:30:27 +0000 (15:30 +1000)
commit38bcb208f60924a031b9f809f7cd252ea4a94e5f
tree890007acc9d7f8a8b7ec2a923434a7845818a8c1
parenta90e049cacd965dade4dae7263b4d3fd550e78b6
drm/nouveau/bar/gf100: fix access to upper half of BAR2

Bit 30 being set causes the upper half of BAR2 to stay in physical mode,
mapped over the end of VRAM, even when the rest of the BAR has been set
to virtual mode.

We inherited our initial value from RM, but I'm not aware of any reason
we need to keep it that way.

This fixes severe GPU hang/lockup issues revealed by Wayland on F26.

Shout-out to NVIDIA for the quick response with the potential cause!

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org # 4.3+
drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c