Quoting Dhinakaran Pandiyan (2018-02-13 21:46:13)
> DRM_IOCTL_MODE_CURSOR results in a frontbuffer flush before the cursor
> plane MMIOs are written to. But this flush is not necessary for PSR as
> hardware tracking takes care of exiting PSR when the MMIO's are written.
>
> Introduce a new fb_op_origin enum to differentiate flushes due to a BO
> being pinned from those originating due to a dirty fbdev buffer. Now, this
> enum can be ignored in psr_flush and psr_invalidate.
>
> v2: Update comment in i915_gem_object_pin_to_display_plane. (Chris)
>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/i915_gem.c | 11 +++++++++--
> drivers/gpu/drm/i915/intel_psr.c | 6 ++++--
> 3 files changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 81886b74c750..3bf6c6ec0509 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -637,6 +637,7 @@ enum fb_op_origin {
> ORIGIN_CS,
> ORIGIN_FLIP,
> ORIGIN_DIRTYFB,
> + ORIGIN_PINNEDFB,
> };
>
> struct intel_fbc {
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index fc68b35854df..405acf3562de 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4139,9 +4139,16 @@ i915_gem_object_pin_to_display_plane(struct
> drm_i915_gem_object *obj,
>
> vma->display_alignment = max_t(u64, vma->display_alignment,
> alignment);
>
> - /* Treat this as an end-of-frame, like intel_user_framebuffer_dirty()
> */
> + /* Treat this as an end-of-frame, like intel_user_framebuffer_dirty()
> to
> + * flush the caches.
> + */
> __i915_gem_object_flush_for_display(obj);
> - intel_fb_obj_flush(obj, ORIGIN_DIRTYFB);
> +
> + /* Features like PSR might want to rely on HW to do the frontbuffer
> + * flush, pass origin as ORIGIN_PINNEDFB rather than ORIGIN_DIRTYFB
> + * so that their flush implementations can handle it accordingly.
> + */
So why it is different? Why can't the dirtyfb ioctl benefit from HW, which the
application is meant to call every frame to *all* dirty framebuffers
(which include cursors in atomic)?
> + intel_fb_obj_flush(obj, ORIGIN_PINNEDFB);
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