Patch "drm/radeon: Override fpfn for all VRAM placements in radeon_evict_flags" has been added to the 4.9-stable tree

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

drm/radeon: Override fpfn for all VRAM placements in radeon_evict_flags

to the 4.9-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-radeon-override-fpfn-for-all-vram-placements-in-radeon_evict_flags.patch
and it can be found in the queue-4.9 subdirectory.

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

From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <[email protected]>
Date: Fri, 24 Mar 2017 19:01:09 +0900
Subject: drm/radeon: Override fpfn for all VRAM placements in radeon_evict_flags
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From: Michel Dänzer <[email protected]>

commit ce4b4f228e51219b0b79588caf73225b08b5b779 upstream.

We were accidentally only overriding the first VRAM placement. For BOs with the RADEON_GEM_NO_CPU_ACCESS flag set, radeon_ttm_placement_from_domain creates a second VRAM placment with fpfn == 0. If VRAM is almost full, the first VRAM placement with fpfn > 0 may not work, but the second one with fpfn == 0 always will (the BO's current location trivially satisfies it). Because "moving" the BO to its current location puts it back on the LRU list, this results in an infinite loop.

inaccessible VRAM first")

---
 drivers/gpu/drm/radeon/radeon_ttm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -213,8 +213,8 @@ static void radeon_evict_flags(struct tt
 			rbo->placement.num_busy_placement = 0;
 			for (i = 0; i < rbo->placement.num_placement; i++) {
 				if (rbo->placements[i].flags & TTM_PL_FLAG_VRAM) {
-					if (rbo->placements[0].fpfn < fpfn)
-						rbo->placements[0].fpfn = fpfn;
+					if (rbo->placements[i].fpfn < fpfn)
+						rbo->placements[i].fpfn = fpfn;
 				} else {
 					rbo->placement.busy_placement =
 						&rbo->placements[i];

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

queue-4.9/drm-radeon-override-fpfn-for-all-vram-placements-in-radeon_evict_flags.patch