Re: [PATCH 6/6] drm/i915: Add a cursor hack to allow converting legacy page flip to atomic.

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On 8 December 2016 at 13:45, Maarten Lankhorst
<maarten.lankhorst@xxxxxxxxxxxxxxx> wrote:
> Do something similar to vc4, only allow updating the cursor state
> in-place through a fastpath when the watermarks are unaffected. This
> will allow cursor movement to be smooth, but changing cursor size or
> showing/hiding cursor will still fall back so watermarks can be updated.
>
> Only moving and changing fb is allowed.
>
> Changes since v1:
> - Set page flip to always_unused for trybot.
> - Copy fence correctly, ignore plane_state->state, should be NULL.
> - Check crtc_state for !active and modeset, go to slowpath if the case.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
>  drivers/gpu/drm/i915/intel_atomic_plane.c |  47 +++++++-----
>  drivers/gpu/drm/i915/intel_display.c      | 123 +++++++++++++++++++++++++++++-
>  drivers/gpu/drm/i915/intel_drv.h          |   2 +
>  3 files changed, 153 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index dbe9fb41ae53..60d75ce8a989 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -103,36 +103,24 @@ intel_plane_destroy_state(struct drm_plane *plane,
>         drm_atomic_helper_plane_destroy_state(plane, state);
>  }
>
> -static int intel_plane_atomic_check(struct drm_plane *plane,
> -                                   struct drm_plane_state *state)
> +int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
> +                                       struct intel_plane_state *intel_state)
>  {
> +       struct drm_plane *plane = intel_state->base.plane;
>         struct drm_i915_private *dev_priv = to_i915(plane->dev);
> -       struct drm_crtc *crtc = state->crtc;
> -       struct intel_crtc *intel_crtc;
> -       struct intel_crtc_state *crtc_state;
> +       struct drm_plane_state *state = &intel_state->base;
>         struct intel_plane *intel_plane = to_intel_plane(plane);
> -       struct intel_plane_state *intel_state = to_intel_plane_state(state);
> -       struct drm_crtc_state *drm_crtc_state;
>         int ret;
>
> -       crtc = crtc ? crtc : plane->state->crtc;
> -       intel_crtc = to_intel_crtc(crtc);
> -
>         /*
>          * Both crtc and plane->crtc could be NULL if we're updating a
>          * property while the plane is disabled.  We don't actually have
>          * anything driver-specific we need to test in that case, so
>          * just return success.
>          */
> -       if (!crtc)
> +       if (!intel_state->base.crtc && !plane->state->crtc)
>                 return 0;
>
> -       drm_crtc_state = drm_atomic_get_existing_crtc_state(state->state, crtc);
> -       if (WARN_ON(!drm_crtc_state))
> -               return -EINVAL;
> -
> -       crtc_state = to_intel_crtc_state(drm_crtc_state);
> -
>         /* Clip all planes to CRTC size, or 0x0 if CRTC is disabled */
>         intel_state->clip.x1 = 0;
>         intel_state->clip.y1 = 0;
> @@ -184,6 +172,31 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
>         return intel_plane_atomic_calc_changes(&crtc_state->base, state);
>  }
>
> +static int intel_plane_atomic_check(struct drm_plane *plane,
> +                                   struct drm_plane_state *state)
> +{
> +       struct drm_crtc *crtc = state->crtc;
> +       struct drm_crtc_state *drm_crtc_state;
> +
> +       crtc = crtc ? crtc : plane->state->crtc;
> +
> +       /*
> +        * Both crtc and plane->crtc could be NULL if we're updating a
> +        * property while the plane is disabled.  We don't actually have
> +        * anything driver-specific we need to test in that case, so
> +        * just return success.
> +        */
> +       if (!crtc)
> +               return 0;
> +
> +       drm_crtc_state = drm_atomic_get_existing_crtc_state(state->state, crtc);
> +       if (WARN_ON(!drm_crtc_state))
> +               return -EINVAL;
> +
> +       return intel_plane_atomic_check_with_state(to_intel_crtc_state(drm_crtc_state),
> +                                                  to_intel_plane_state(state));
> +}
> +
>  static void intel_plane_atomic_update(struct drm_plane *plane,
>                                       struct drm_plane_state *old_state)
>  {
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 9eaf1e5bdae9..a8b8663ecda7 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -15028,6 +15029,124 @@ const struct drm_plane_funcs intel_plane_funcs = {
>         .atomic_destroy_state = intel_plane_destroy_state,
>  };
>
> +static int
> +intel_legacy_cursor_update(struct drm_plane *plane,
> +                          struct drm_crtc *crtc,
> +                          struct drm_framebuffer *fb,
> +                          int crtc_x, int crtc_y,
> +                          unsigned int crtc_w, unsigned int crtc_h,
> +                          uint32_t src_x, uint32_t src_y,
> +                          uint32_t src_w, uint32_t src_h)
> +{
> +       struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> +       int ret;
> +       struct drm_plane_state *old_plane_state, *new_plane_state;
> +       struct intel_plane *intel_plane = to_intel_plane(plane);
> +       struct drm_framebuffer *old_fb;
> +       struct drm_crtc_state *crtc_state = crtc->state;
> +
> +       if (!crtc_state->active || needs_modeset(crtc_state) ||
> +           to_intel_crtc_state(crtc_state)->update_pipe)
> +               goto slow;
> +
> +       old_plane_state = plane->state;
> +
> +       if (old_plane_state->crtc != crtc ||
> +           old_plane_state->src_w != src_w ||
> +           old_plane_state->src_h != src_h ||
> +           old_plane_state->crtc_w != crtc_w ||
> +           old_plane_state->crtc_h != crtc_h ||
> +           !old_plane_state->visible ||
> +           old_plane_state->fb->modifier != fb->modifier)
> +               goto slow;
> +
> +       new_plane_state = intel_plane_duplicate_state(plane);
> +       if (!new_plane_state)
> +               return -ENOMEM;
> +
> +       drm_atomic_set_fb_for_plane(new_plane_state, fb);
> +
> +       new_plane_state->src_x = src_x;
> +       new_plane_state->src_y = src_y;
> +       new_plane_state->src_w = src_w;
> +       new_plane_state->src_h = src_h;
> +       new_plane_state->crtc_x = crtc_x;
> +       new_plane_state->crtc_y = crtc_y;
> +       new_plane_state->crtc_w = crtc_w;
> +       new_plane_state->crtc_h = crtc_h;
> +
> +       ret = intel_plane_atomic_check_with_state(to_intel_crtc_state(crtc->state),
> +                                                 to_intel_plane_state(new_plane_state));
> +       if (ret)
> +               return ret;
> +
> +       if (!new_plane_state->visible) {
> +               intel_plane_destroy_state(plane, new_plane_state);
> +               goto slow;
> +       }
> +
> +       ret = mutex_lock_interruptible(&dev_priv->drm.struct_mutex);
> +       if (ret)
> +               return ret;
> +
> +       if (INTEL_INFO(dev_priv)->cursor_needs_physical) {
> +               int align = IS_I830(dev_priv) ? 16 * 1024 : 256;
> +
> +               ret = i915_gem_object_attach_phys(intel_fb_obj(fb), align);
> +               if (ret) {
> +                       DRM_DEBUG_KMS("failed to attach phys object\n");
> +                       return ret;
Drive-by-comment. Shouldn't there be some clean up in both error
paths, like mutex_unlock ?

> +               }
> +       } else {
> +               struct i915_vma *vma;
> +
> +               vma = intel_pin_and_fence_fb_obj(fb, new_plane_state->rotation);
> +               if (IS_ERR(vma)) {
> +                       DRM_DEBUG_KMS("failed to pin object\n");
> +
> +                       return PTR_ERR(vma);
> +               }
> +       }
> +
> +       old_fb = old_plane_state->fb;
> +
> +       i915_gem_track_fb(intel_fb_obj(old_fb), intel_fb_obj(fb),
> +                         intel_plane->frontbuffer_bit);
> +
> +       /* Swap plane state */
> +       new_plane_state->fence = old_plane_state->fence;
> +       *to_intel_plane_state(old_plane_state) = *to_intel_plane_state(new_plane_state);
> +       new_plane_state->fence = NULL;
> +       new_plane_state->fb = old_fb;
> +
> +       intel_plane->update_plane(plane,
> +                                 to_intel_crtc_state(crtc->state),
> +                                 to_intel_plane_state(plane->state));
> +
> +       intel_cleanup_plane_fb(plane, new_plane_state);
> +       mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> +       intel_plane_destroy_state(plane, new_plane_state);
> +
> +       return 0;
> +
> +slow:
> +       return drm_atomic_helper_update_plane(plane, crtc, fb,
> +                                             crtc_x, crtc_y, crtc_w, crtc_h,
> +                                             src_x, src_y, src_w, src_h);
> +}
> +
> +static const struct drm_plane_funcs intel_cursor_plane_funcs = {
> +       .update_plane = intel_legacy_cursor_update,
> +       .disable_plane = drm_atomic_helper_disable_plane,
> +       .destroy = intel_plane_destroy,
> +       .set_property = drm_atomic_helper_plane_set_property,
> +       .atomic_get_property = intel_plane_atomic_get_property,
> +       .atomic_set_property = intel_plane_atomic_set_property,
> +       .atomic_duplicate_state = intel_plane_duplicate_state,
> +       .atomic_destroy_state = intel_plane_destroy_state,
> +};
> +
>  static struct intel_plane *
>  intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  {
> @@ -15274,7 +15393,7 @@ intel_cursor_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>         cursor->disable_plane = intel_disable_cursor_plane;
>
>         ret = drm_universal_plane_init(&dev_priv->drm, &cursor->base,
> -                                      0, &intel_plane_funcs,
> +                                      0, &intel_cursor_plane_funcs,
>                                        intel_cursor_formats,
>                                        ARRAY_SIZE(intel_cursor_formats),
>                                        DRM_PLANE_TYPE_CURSOR,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 8f4ddca0f521..8b6f39506d45 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1844,6 +1844,8 @@ struct drm_plane_state *intel_plane_duplicate_state(struct drm_plane *plane);
>  void intel_plane_destroy_state(struct drm_plane *plane,
>                                struct drm_plane_state *state);
>  extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
> +int intel_plane_atomic_check_with_state(struct intel_crtc_state *crtc_state,
> +                                       struct intel_plane_state *intel_state);
>
>  /* intel_color.c */
>  void intel_color_init(struct drm_crtc *crtc);
> --
> 2.7.4
>
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