Quoting Animesh Manna (2019-08-21 07:32:31)
> Freed the gem object after completion of dsb workload.
> 
> Cc: Shashank Sharma <[email protected]>
> Cc: Jani Nikula <[email protected]>
> Cc: Rodrigo Vivi <[email protected]>
> Signed-off-by: Animesh Manna <[email protected]>
> ---
>  drivers/gpu/drm/i915/display/intel_dsb.c | 23 +++++++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_dsb.h |  1 +
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c 
> b/drivers/gpu/drm/i915/display/intel_dsb.c
> index 7e0a9b37f702..bfb138952f61 100644
> --- a/drivers/gpu/drm/i915/display/intel_dsb.c
> +++ b/drivers/gpu/drm/i915/display/intel_dsb.c
> @@ -234,3 +234,26 @@ void intel_dsb_commit(struct intel_dsb *dsb)
>         dsb->free_pos = 0;
>         intel_dsb_disable_engine(dsb);
>  }
> +
> +void intel_dsb_put(struct intel_dsb *dsb)
> +{
> +       struct intel_crtc *crtc;
> +       struct drm_i915_private *i915;
> +       struct i915_vma *vma;
> +
> +       if (!dsb)
> +               return;
> +
> +       crtc = dsb->crtc;
> +       i915 = to_i915(crtc->base.dev);
> +
> +       if (dsb->cmd_buf) {
> +               vma = dsb->vma;
> +               mutex_lock(&i915->drm.struct_mutex);
> +               crtc->dsb_in_use--;

That is complete garbage. This dsb just happens to be crtc->dsb_in_use?

> +               i915_gem_object_unpin_map(vma->obj);
> +               i915_vma_unpin_and_release(&vma, 0);

i915_vma_unpin_and_release(vma, I915_VMA_RELEASE_MAP);

Does not require struct_mutex.

Put this with the allocator.
-Chris
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