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From 3aab708ce7e4a5b3bdcb00a652f8df935dd67fdb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Wed, 7 Nov 2018 13:55:01 +0100
Subject: [PATCH 1622/2940] drm/amdgpu: stop evicting busy PDs/PTs
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Otherwise we won't be able to cleanly handle page faults.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 822add55c77d..3ec146b6b9c8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1510,6 +1510,13 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
struct dma_fence *f;
int i;
+ /* Don't evict VM page tables while they are busy, otherwise we can't
+ * cleanly handle page faults.
+ */
+ if (bo->type == ttm_bo_type_kernel &&
+ !reservation_object_test_signaled_rcu(bo->resv, true))
+ return false;
+
/* If bo is a KFD BO, check if the bo belongs to the current process.
* If true, then return false as any KFD process needs all its BOs to
* be resident to run successfully
--
2.17.1
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