From 9ff9dc0ab3daf2b019ed4378861d28601a05ccba Mon Sep 17 00:00:00 2001
From: Philip Yang <Philip.Yang@amd.com>
Date: Fri, 22 Jul 2022 15:07:00 -0400
Subject: drm/amdgpu: Allow TTM to evict svm bo from same process
Git-commit: 79b2c54f19110235041d8f1250e3c3694047a902
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

To support SVM range VRAM overcommitment, TTM should be able to evict
svm bo of same process to system memory, to get space to alloc new svm
bo.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c
index 1d0dbff87d3f..469785d33791 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_fence.c
@@ -159,11 +159,14 @@ static void amdkfd_fence_release(struct dma_fence *f)
 }
 
 /**
- * amdkfd_fence_check_mm - Check if @mm is same as that of the fence @f
- *  if same return TRUE else return FALSE.
+ * amdkfd_fence_check_mm - Check whether to prevent eviction of @f by @mm
  *
  * @f: [IN] fence
  * @mm: [IN] mm that needs to be verified
+ *
+ * Check if @mm is same as that of the fence @f, if same return TRUE else
+ * return FALSE.
+ * For svm bo, which support vram overcommitment, always return FALSE.
  */
 bool amdkfd_fence_check_mm(struct dma_fence *f, struct mm_struct *mm)
 {
@@ -171,7 +174,7 @@ bool amdkfd_fence_check_mm(struct dma_fence *f, struct mm_struct *mm)
 
 	if (!fence)
 		return false;
-	else if (fence->mm == mm)
+	else if (fence->mm == mm  && !fence->svm_bo)
 		return true;
 
 	return false;
-- 
2.38.1