RE: [PATCH i915 v4 1/2] i915: wait for fences in mmio_flip()

[Alexander Goins <agoins@nvidia.com>]

Alright, will do.

Thanks,
Alex

-----Original Message-----
From: Daniel Vetter [mailto:daniel.vetter@ffwll.ch] On Behalf Of Daniel Vetter
Sent: Friday, November 20, 2015 12:21 AM
To: Alexander Goins
Cc: dri-devel@lists.freedesktop.org; daniel@fooishbar.org; daniel@ffwll.ch; maarten.lankhorst@linux.intel.com; chris@chris-wilson.co.uk
Subject: Re: [PATCH i915 v4 1/2] i915: wait for fences in mmio_flip()

On Thu, Nov 19, 2015 at 07:51:25PM -0800, Alex Goins wrote:
> If a buffer is backed by dmabuf, wait on its reservation object's 
> fences before flipping.
> 
> Signed-off-by: Alex Goins <agoins@nvidia.com>

When resending patches please add a per-revision changelog to each patch with notes what changed. Otherwise reviewers have to recollect all the context themselves by digging through old threads.

Can you please resend with that added?

Thanks, Daniel

> ---
>  drivers/gpu/drm/i915/intel_display.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c 
> b/drivers/gpu/drm/i915/intel_display.c
> index b2270d5..4867ff0 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -44,6 +44,8 @@
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_rect.h>
>  #include <linux/dma_remapping.h>
> +#include <linux/reservation.h>
> +#include <linux/dma-buf.h>
>  
>  /* Primary plane formats for gen <= 3 */  static const uint32_t 
> i8xx_primary_formats[] = { @@ -11088,6 +11090,8 @@ static bool 
> use_mmio_flip(struct intel_engine_cs *ring,
>  		return true;
>  	else if (i915.enable_execlists)
>  		return true;
> +	else if (obj->base.dma_buf && obj->base.dma_buf->resv->fence_excl)
> +		return true;
>  	else
>  		return ring != i915_gem_request_get_ring(obj->last_write_req);
>  }
> @@ -11170,8 +11174,18 @@ static void ilk_do_mmio_flip(struct 
> intel_crtc *intel_crtc)  static void intel_do_mmio_flip(struct 
> intel_crtc *intel_crtc)  {
>  	struct drm_device *dev = intel_crtc->base.dev;
> +	struct intel_framebuffer *intel_fb =
> +		to_intel_framebuffer(intel_crtc->base.primary->fb);
> +	struct drm_i915_gem_object *obj = intel_fb->obj;
>  	u32 start_vbl_count;
>  
> +	/* For framebuffer backed by dmabuf, wait for fence */
> +	if (obj->base.dma_buf) {
> +		reservation_object_wait_timeout_rcu(
> +			obj->base.dma_buf->resv,
> +			false, true, MAX_SCHEDULE_TIMEOUT);
> +	}
> +
>  	intel_mark_page_flip_active(intel_crtc);
>  
>  	intel_pipe_update_start(intel_crtc, &start_vbl_count);
> --
> 1.9.1
> 
> 
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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