* [PATCH] drm/amdgpu: fix size calculation in amdgpu_ttm_copy_mem_to_mem
@ 2020-04-03 15:21 Christian König
2020-04-03 16:02 ` Felix Kuehling
0 siblings, 1 reply; 2+ messages in thread
From: Christian König @ 2020-04-03 15:21 UTC (permalink / raw)
To: amd-gfx; +Cc: Felix.Kuehling, Candice.Li
When the node is larger than 4GB we overrun the size calculation.
Fix this by correctly limiting the size to the window as well.
Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 029b661faef6..1b658e905620 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -454,9 +454,9 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
/* Copy size cannot exceed GTT_MAX_BYTES. So if src or dst
* begins at an offset, then adjust the size accordingly
*/
- cur_size = min3(src_node_size, dst_node_size, size);
- cur_size = min(GTT_MAX_BYTES - src_page_offset, cur_size);
- cur_size = min(GTT_MAX_BYTES - dst_page_offset, cur_size);
+ cur_size = max(src_page_offset, dst_page_offset);
+ cur_size = min(min3(src_node_size, dst_node_size, size),
+ (uint64_t)(GTT_MAX_BYTES - cur_size));
/* Map src to window 0 and dst to window 1. */
r = amdgpu_ttm_map_buffer(src->bo, src->mem, src_mm,
--
2.17.1
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* Re: [PATCH] drm/amdgpu: fix size calculation in amdgpu_ttm_copy_mem_to_mem
2020-04-03 15:21 [PATCH] drm/amdgpu: fix size calculation in amdgpu_ttm_copy_mem_to_mem Christian König
@ 2020-04-03 16:02 ` Felix Kuehling
0 siblings, 0 replies; 2+ messages in thread
From: Felix Kuehling @ 2020-04-03 16:02 UTC (permalink / raw)
To: Christian König, amd-gfx; +Cc: Candice.Li
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Am 2020-04-03 um 11:21 a.m. schrieb Christian König:
> When the node is larger than 4GB we overrun the size calculation.
>
> Fix this by correctly limiting the size to the window as well.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 029b661faef6..1b658e905620 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -454,9 +454,9 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev,
> /* Copy size cannot exceed GTT_MAX_BYTES. So if src or dst
> * begins at an offset, then adjust the size accordingly
> */
> - cur_size = min3(src_node_size, dst_node_size, size);
> - cur_size = min(GTT_MAX_BYTES - src_page_offset, cur_size);
> - cur_size = min(GTT_MAX_BYTES - dst_page_offset, cur_size);
> + cur_size = max(src_page_offset, dst_page_offset);
> + cur_size = min(min3(src_node_size, dst_node_size, size),
> + (uint64_t)(GTT_MAX_BYTES - cur_size));
This makes me wish for a min4 macro. I think the most efficient way to
write this would be
cur_size = min(min(src_node_size, dst_node_size),
min(size, (uint64_t)(GTT_MAX_BYTES - cur_size)));
Either way, this patch is
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
>
> /* Map src to window 0 and dst to window 1. */
> r = amdgpu_ttm_map_buffer(src->bo, src->mem, src_mm,
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2020-04-03 15:21 [PATCH] drm/amdgpu: fix size calculation in amdgpu_ttm_copy_mem_to_mem Christian König
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