Patch "drm/nouveau/bar/gf100: fix access to upper half of BAR2" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

drm/nouveau/bar/gf100: fix access to upper half of BAR2

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-nouveau-bar-gf100-fix-access-to-upper-half-of-bar2.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ben Skeggs <[email protected]>
Date: Tue, 25 Jul 2017 11:06:47 +1000
Subject: drm/nouveau/bar/gf100: fix access to upper half of BAR2

From: Ben Skeggs <[email protected]>

commit 38bcb208f60924a031b9f809f7cd252ea4a94e5f upstream.

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!

---
 drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -129,7 +129,7 @@ gf100_bar_init(struct nvkm_bar *base)
 
 	if (bar->bar[0].mem) {
 		addr = nvkm_memory_addr(bar->bar[0].mem) >> 12;
-		nvkm_wr32(device, 0x001714, 0xc0000000 | addr);
+		nvkm_wr32(device, 0x001714, 0x80000000 | addr);
 	}
 
 	return 0;

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/drm-nouveau-bar-gf100-fix-access-to-upper-half-of-bar2.patch