linux-kernel - [PATCH 5.15 288/317] nouveau: reset the bo resource bus info after an eviction

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Date: Sun, 24 Mar 2024 19:34:28 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dave Airlie <airlied@...hat.com>,
	Christian König <christian.koenig@....com>,
	Danilo Krummrich <dakr@...hat.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 288/317] nouveau: reset the bo resource bus info after an eviction

From: Dave Airlie <airlied@...hat.com>

[ Upstream commit f35c9af45ea7a4b1115b193d84858b14d13517fc ]

Later attempts to refault the bo won't happen and the whole
GPU does to lunch. I think Christian's refactoring of this
code out to the driver broke this not very well tested path.

Fixes: 141b15e59175 ("drm/nouveau: move io_reserve_lru handling into the driver v5")
Cc: Christian König <christian.koenig@....com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Acked-by: Christian König <christian.koenig@....com>
Signed-off-by: Danilo Krummrich <dakr@...hat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240311072037.287905-1-airlied@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/nouveau/nouveau_bo.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index da58230bcb1fc..2048eac841ddf 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1186,6 +1186,8 @@ nouveau_ttm_io_mem_reserve(struct ttm_device *bdev, struct ttm_resource *reg)
 			drm_vma_node_unmap(&nvbo->bo.base.vma_node,
 					   bdev->dev_mapping);
 			nouveau_ttm_io_mem_free_locked(drm, nvbo->bo.resource);
+			nvbo->bo.resource->bus.offset = 0;
+			nvbo->bo.resource->bus.addr = NULL;
 			goto retry;
 		}
 
-- 
2.43.0