[PATCH 08/28] drm/i915: Create a full object for mock_ring, v2.

[Matthew Auld]

On Thu, 21 Oct 2021 at 11:36, Maarten Lankhorst
<maarten.lankhorst at linux.intel.com> wrote:
>
> This allows us to finally get rid of all the assumptions that vma->obj is NULL.
>
> Changes since v1:
> - Ensure the mock_ring vma is pinned to prevent a fault.
> - Pin it high to avoid failure in evict_for_vma selftest.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/gt/mock_engine.c | 38 ++++++++++++++++++++-------
>  1 file changed, 28 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
> index 8b89215afe46..bb99fc03f503 100644
> --- a/drivers/gpu/drm/i915/gt/mock_engine.c
> +++ b/drivers/gpu/drm/i915/gt/mock_engine.c
> @@ -35,9 +35,31 @@ static void mock_timeline_unpin(struct intel_timeline *tl)
>         atomic_dec(&tl->pin_count);
>  }
>
> +static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size)
> +{
> +       struct i915_address_space *vm = &ggtt->vm;
> +       struct drm_i915_private *i915 = vm->i915;
> +       struct drm_i915_gem_object *obj;
> +       struct i915_vma *vma;
> +
> +       obj = i915_gem_object_create_internal(i915, size);
> +       if (IS_ERR(obj))
> +               return ERR_CAST(obj);

We didn't want to use the dummy object here also? I guess meh?

> +
> +       vma = i915_vma_instance(obj, vm, NULL);
> +       if (IS_ERR(vma))
> +               goto err;
> +
> +       return vma;
> +
> +err:
> +       i915_gem_object_put(obj);
> +       return vma;
> +}
> +
>  static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
>  {
> -       const unsigned long sz = PAGE_SIZE / 2;
> +       const unsigned long sz = PAGE_SIZE;

Is that significant?

Reviewed-by: Matthew Auld <matthew.auld at intel.com>


>         struct intel_ring *ring;
>
>         ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);
> @@ -50,15 +72,11 @@ static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
>         ring->vaddr = (void *)(ring + 1);
>         atomic_set(&ring->pin_count, 1);
>
> -       ring->vma = i915_vma_alloc();
> -       if (!ring->vma) {
> +       ring->vma = create_ring_vma(engine->gt->ggtt, PAGE_SIZE);
> +       if (IS_ERR(ring->vma)) {
>                 kfree(ring);
>                 return NULL;
>         }
> -       i915_active_init(&ring->vma->active, NULL, NULL, 0);
> -       __set_bit(I915_VMA_GGTT_BIT, __i915_vma_flags(ring->vma));
> -       __set_bit(DRM_MM_NODE_ALLOCATED_BIT, &ring->vma->node.flags);
> -       ring->vma->node.size = sz;
>
>         intel_ring_update_space(ring);
>
> @@ -67,8 +85,7 @@ static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
>
>  static void mock_ring_free(struct intel_ring *ring)
>  {
> -       i915_active_fini(&ring->vma->active);
> -       i915_vma_free(ring->vma);
> +       i915_vma_put(ring->vma);
>
>         kfree(ring);
>  }
> @@ -125,6 +142,7 @@ static void mock_context_unpin(struct intel_context *ce)
>
>  static void mock_context_post_unpin(struct intel_context *ce)
>  {
> +       i915_vma_unpin(ce->ring->vma);
>  }
>
>  static void mock_context_destroy(struct kref *ref)
> @@ -169,7 +187,7 @@ static int mock_context_alloc(struct intel_context *ce)
>  static int mock_context_pre_pin(struct intel_context *ce,
>                                 struct i915_gem_ww_ctx *ww, void **unused)
>  {
> -       return 0;
> +       return i915_vma_pin_ww(ce->ring->vma, ww, 0, 0, PIN_GLOBAL | PIN_HIGH);
>  }
>
>  static int mock_context_pin(struct intel_context *ce, void *unused)
> --
> 2.33.0
>