[Intel-gfx] [PATCH] drm/i915/display: Add smem fallback allocation for dpt

[Matthew Auld]

On Wed, 16 Mar 2022 at 22:23, Juha-Pekka Heikkila
<juhapekka.heikkila at gmail.com> wrote:
>
> Add fallback smem allocation for dpt if stolen memory
> allocation failed.
>
> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dpt.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dpt.c b/drivers/gpu/drm/i915/display/intel_dpt.c
> index fb0e7e79e0cd..c8b66433d4db 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpt.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpt.c
> @@ -10,6 +10,7 @@
>  #include "intel_display_types.h"
>  #include "intel_dpt.h"
>  #include "intel_fb.h"
> +#include "gem/i915_gem_internal.h"

Nit: these should be kept sorted

>
>  struct i915_dpt {
>         struct i915_address_space vm;
> @@ -128,6 +129,10 @@ struct i915_vma *intel_dpt_pin(struct i915_address_space *vm)
>         void __iomem *iomem;
>         struct i915_gem_ww_ctx ww;
>         int err;
> +       u64 pin_flags = 0;
> +
> +       if (i915_gem_object_is_stolen(dpt->obj))
> +               pin_flags |= PIN_MAPPABLE; /* for i915_vma_pin_iomap(stolen) */
>
>         wakeref = intel_runtime_pm_get(&i915->runtime_pm);
>         atomic_inc(&i915->gpu_error.pending_fb_pin);
> @@ -138,7 +143,7 @@ struct i915_vma *intel_dpt_pin(struct i915_address_space *vm)
>                         continue;
>
>                 vma = i915_gem_object_ggtt_pin_ww(dpt->obj, &ww, NULL, 0, 4096,
> -                                                 HAS_LMEM(i915) ? 0 : PIN_MAPPABLE);
> +                                                 pin_flags);
>                 if (IS_ERR(vma)) {
>                         err = PTR_ERR(vma);
>                         continue;
> @@ -248,10 +253,15 @@ intel_dpt_create(struct intel_framebuffer *fb)
>
>         size = round_up(size * sizeof(gen8_pte_t), I915_GTT_PAGE_SIZE);
>
> -       if (HAS_LMEM(i915))
> -               dpt_obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_CONTIGUOUS);
> -       else
> +       dpt_obj = i915_gem_object_create_lmem(i915, size, I915_BO_ALLOC_CONTIGUOUS);
> +       if (IS_ERR(dpt_obj) && i915_ggtt_has_aperture(to_gt(i915)->ggtt))
>                 dpt_obj = i915_gem_object_create_stolen(i915, size);
> +       if (IS_ERR(dpt_obj) && !HAS_LMEM(i915)) {
> +               drm_dbg_kms(&i915->drm, "fb: [FB:%d] Allocating dpt from smem\n",
> +                           fb->base.base.id);
> +
> +               dpt_obj = i915_gem_object_create_internal(i915, size);

Looks like we are missing some prerequisite patch to be able to
directly map such memory in vma_pin_iomap?

> +       }
>         if (IS_ERR(dpt_obj))
>                 return ERR_CAST(dpt_obj);
>
> --
> 2.28.0
>