linux-kernel - [PATCH AUTOSEL 5.10 27/28] drm/amdgpu: Let KFD sync with VM fences

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Date: Mon, 22 Jan 2024 10:14:53 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Felix Kuehling <Felix.Kuehling@....com>,
	Christian König <christian.koenig@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.10 27/28] drm/amdgpu: Let KFD sync with VM fences

From: Felix Kuehling <Felix.Kuehling@....com>

[ Upstream commit ec9ba4821fa52b5efdbc4cdf0a77497990655231 ]

Change the rules for amdgpu_sync_resv to let KFD synchronize with VM
fences on page table reservations. This fixes intermittent memory
corruption after evictions when using amdgpu_vm_handle_moved to update
page tables for VM mappings managed through render nodes.

Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 8ea6c49529e7..6a22bc41c205 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -241,7 +241,8 @@ int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 
 		/* Never sync to VM updates either. */
 		if (fence_owner == AMDGPU_FENCE_OWNER_VM &&
-		    owner != AMDGPU_FENCE_OWNER_UNDEFINED)
+		    owner != AMDGPU_FENCE_OWNER_UNDEFINED &&
+	    owner != AMDGPU_FENCE_OWNER_KFD)
 			continue;
 
 		/* Ignore fences depending on the sync mode */
-- 
2.43.0