[PATCH 1/2] drm/amdgpu: use zero as start for dummy resource walks

[Pan, Xinhui]

[AMD Official Use Only - Internal Distribution Only]

I don’t think so. Start is offset here. We get the valid physical address from pages_addr[offset] when we update mapping.
Btw, what issue we are seeing?

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Christian K?nig
Sent: 2021年3月23日 22:55
To: amd-gfx at lists.freedesktop.org
Cc: Das, Nirmoy <Nirmoy.Das at amd.com>; Chen, Guchun <Guchun.Chen at amd.com>
Subject: [PATCH 1/2] drm/amdgpu: use zero as start for dummy resource walks

When we don't have a physically backing store we should use zero instead of the virtual start address since that isn't necessary a valid physical one.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
index 40f2adf305bc..e94362ccf9d5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
@@ -54,7 +54,7 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
 struct drm_mm_node *node;

 if (!res || !res->mm_node) {
-cur->start = start;
+cur->start = 0;
 cur->size = size;
 cur->remaining = size;
 cur->node = NULL;
--
2.25.1

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