[Intel-gfx] [PATCH v2 6/8] drm/i915/display: Check mappable aperture when pinning preallocated vma

[Matthew Auld]

On Thu, 10 Mar 2022 at 12:28, Matthew Auld <matthew.auld at intel.com> wrote:
>
> From: CQ Tang <cq.tang at intel.com>
>
> When system does not have mappable aperture, ggtt->mappable_end=0. In
> this case if we pass PIN_MAPPABLE when pinning vma, the pinning code
> will return -ENOSPC. So conditionally set PIN_MAPPABLE if HAS_GMCH().
>
> Suggested-by: Chris P Wilson <chris.p.wilson at intel.com>
> Signed-off-by: CQ Tang <cq.tang at intel.com>
> Cc: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> Cc: Ap Kamal <kamal.ap at intel.com>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>

This at least prevents incorrectly using PIN_MAPPABLE on discrete,
Reviewed-by: Matthew Auld <matthew.auld at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_plane_initial.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_plane_initial.c b/drivers/gpu/drm/i915/display/intel_plane_initial.c
> index 5227e5b35206..f797fcef18fc 100644
> --- a/drivers/gpu/drm/i915/display/intel_plane_initial.c
> +++ b/drivers/gpu/drm/i915/display/intel_plane_initial.c
> @@ -51,6 +51,7 @@ initial_plane_vma(struct drm_i915_private *i915,
>         struct drm_i915_gem_object *obj;
>         struct i915_vma *vma;
>         u32 base, size;
> +       u64 pinctl;
>
>         if (!mem || plane_config->size == 0)
>                 return NULL;
> @@ -101,7 +102,10 @@ initial_plane_vma(struct drm_i915_private *i915,
>         if (IS_ERR(vma))
>                 goto err_obj;
>
> -       if (i915_ggtt_pin(vma, NULL, 0, PIN_MAPPABLE | PIN_OFFSET_FIXED | base))
> +       pinctl = PIN_GLOBAL | PIN_OFFSET_FIXED | base;
> +       if (HAS_GMCH(i915))
> +               pinctl |= PIN_MAPPABLE;
> +       if (i915_vma_pin(vma, 0, 0, pinctl))
>                 goto err_obj;
>
>         if (i915_gem_object_is_tiled(obj) &&
> --
> 2.34.1
>