Patch "drm/etnaviv: trick drm_mm into giving out a low IOVA" 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/etnaviv: trick drm_mm into giving out a low IOVA

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-etnaviv-trick-drm_mm-into-giving-out-a-low-iova.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: Lucas Stach <[email protected]>
Date: Mon, 12 Dec 2016 16:15:17 +0100
Subject: drm/etnaviv: trick drm_mm into giving out a low IOVA

From: Lucas Stach <[email protected]>

[ Upstream commit 3546fb0cdac25a79c89d87020566fab52b92867d ]

After rollover of the IOVA space, we want to get a low IOVA address, otherwise the the games we play by remembering the last IOVA are pointless. When we search for a free hole with DRM_MM_SEARCH_DEFAULT, drm_mm will pop the next entry from the free holes stack, which will likely be a high IOVA. By using DRM_MM_SEARCH_BELOW we can trick drm_mm into reversing the search and provide us with a low IOVA.

---
 drivers/gpu/drm/etnaviv/etnaviv_mmu.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

@@ -116,9 +116,14 @@ static int etnaviv_iommu_find_iova(struc
 		struct list_head list;
 		bool found;
 
+		/*
+		 * XXX: The DRM_MM_SEARCH_BELOW is really a hack to trick
+		 * drm_mm into giving out a low IOVA after address space
+		 * rollover. This needs a proper fix.
+		 */
 		ret = drm_mm_insert_node_in_range(&mmu->mm, node,
 			size, 0, mmu->last_iova, ~0UL,
-			DRM_MM_SEARCH_DEFAULT);
+			mmu->last_iova ? DRM_MM_SEARCH_DEFAULT : DRM_MM_SEARCH_BELOW);
 
 		if (ret != -ENOSPC)
 			break;

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

queue-4.9/drm-etnaviv-trick-drm_mm-into-giving-out-a-low-iova.patch