linux-kernel - FAILED: Patch "drm/amdgpu: amdgpu_ttm_gart_bind set gtt bound flag" failed to apply to 5.4-stable tree

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Date: Wed, 27 Mar 2024 08:24:36 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	Philip.Yang@....com
Cc: Christian König <christian.koenig@....com>,
	Alex Deucher <alexander.deucher@....com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "drm/amdgpu: amdgpu_ttm_gart_bind set gtt bound flag" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 6c6064cbe58b43533e3451ad6a8ba9736c109ac3 Mon Sep 17 00:00:00 2001
From: Philip Yang <Philip.Yang@....com>
Date: Mon, 11 Mar 2024 18:07:34 -0400
Subject: [PATCH] drm/amdgpu: amdgpu_ttm_gart_bind set gtt bound flag
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Otherwise after the GTT bo is released, the GTT and gart space is freed
but amdgpu_ttm_backend_unbind will not clear the gart page table entry
and leave valid mapping entry pointing to the stale system page. Then
if GPU access the gart address mistakely, it will read undefined value
instead page fault, harder to debug and reproduce the real issue.

Cc: stable@...r.kernel.org
Signed-off-by: Philip Yang <Philip.Yang@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 8722beba494e5..fc418e670fdae 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -864,6 +864,7 @@ static void amdgpu_ttm_gart_bind(struct amdgpu_device *adev,
 		amdgpu_gart_bind(adev, gtt->offset, ttm->num_pages,
 				 gtt->ttm.dma_address, flags);
 	}
+	gtt->bound = true;
 }
 
 /*
-- 
2.43.0