[PATCH] drm/amdgpu: fix gtt_mgr bo's offset

[Flora Cui]

On Wed, Sep 21, 2016 at 09:54:04AM +0800, zhoucm1 wrote:
> 
> 
> On 2016年09月20日 19:40, Christian König wrote:
> >Am 20.09.2016 um 13:16 schrieb Flora Cui:
> >>Does this change make sense?
> >
> >Yes, exactly. Patch is Reviewed-by: Christian König
> ><christian.koenig at amd.com>.
> Hi Flora,
> Does this change work?
> 
> if (&tbo->mem == mem)
> this checking seems always be false, right?
mostly the check is true. eg
amdgpu_bo_pin_restricted->amdgpu_ttm_bind(), the mem is &bo->tbo.mem
> 
> Regards,
> David Zhou
> >
> >But please be aware that there is at least one other bug I'm currently
> >investigating.
> >
> >Regards,
> >Christian.
> >
> >>
> >>On Tue, Sep 20, 2016 at 01:02:20PM +0200, Christian König wrote:
> >>>Am 20.09.2016 um 12:41 schrieb Flora Cui:
> >>>>On Tue, Sep 20, 2016 at 06:19:33PM +0800, zhoucm1 wrote:
> >>>>>On 2016年09月20日 17:09, Flora Cui wrote:
> >>>>>>Change-Id: I89e9be3d5c96d46655f3a977fb557b20b4d87609
> >>>>>>Signed-off-by: Flora Cui <Flora.Cui at amd.com>
> >>>>>>---
> >>>>>>  drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c | 4 ++--
> >>>>>>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>>>>>
> >>>>>>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> >>>>>>b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> >>>>>>index 262e872..b266cf7 100644
> >>>>>>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> >>>>>>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
> >>>>>>@@ -128,8 +128,8 @@ int amdgpu_gtt_mgr_alloc(struct
> >>>>>>ttm_mem_type_manager *man,
> >>>>>>      if (!r) {
> >>>>>>          mem->start = node->start;
> >>>>>>-        tbo->offset = (tbo->mem.start << PAGE_SHIFT) +
> >>>>>>- tbo->bdev->man[tbo->mem.mem_type].gpu_offset;
> >>>>>>+        tbo->offset = (mem->start << PAGE_SHIFT) +
> >>>>>>+ tbo->bdev->man[mem->mem_type].gpu_offset;
> >>>>>mem->mem_type seems not set yet as well if I am correct.
> >>>>>IIRC, I feel it's better that tbo->offset is set out of this
> >>>>>function after
> >>>>>get_node successfully.
> >>>>>
> >>>>how about change to tbo->bdev->man[TTM_PL_TT].gpu_offset? since
> >>>>gtt_mgr is for GTT only.
> >>>Not 100% correct either.
> >>>
> >>>The problem is that sometimes a GTT MM node will be bound for a BO
> >>>which is
> >>>still in VRAM (e.g. on eviction for example).
> >>>
> >>>So you need to check if (&tbo->mem == mem) and only then update the
> >>>tbo's
> >>>offset.
> >>>
> >>>Regards,
> >>>Christian.
> >>>
> >>>>>Regards,
> >>>>>David Zhou
> >>>>>
> >>>>>>      }
> >>>>>>      return r;
> >>>>_______________________________________________
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> >>>>amd-gfx at lists.freedesktop.org
> >>>>https://lists.freedesktop.org/mailman/listinfo/amd-gfx
> >>>
> >>>_______________________________________________
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> >
> >
>