Re: [PATCH v3 15/28] drm/i915: Convert 'flip_queued_seqno' into 'flip_queued_request'

[Daniel Vetter <daniel@ffwll.ch>]

On Mon, Nov 24, 2014 at 06:49:37PM +0000, John.C.Harrison@Intel.com wrote:
> From: John Harrison <John.C.Harrison@Intel.com>
> 
> Converted the flip_queued_seqno value to be a request structure as part of the
> on going seqno to request changes. This includes reference counting the request
> being saved away to ensure it can not be retired and freed while the flip code
> is still waiting on it.
> 
> For: VIZ-4377
> Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
> Reviewed-by: Thomas Daniel <Thomas.Daniel@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c  |    4 ++--
>  drivers/gpu/drm/i915/intel_display.c |   24 ++++++++++++++++--------
>  drivers/gpu/drm/i915/intel_drv.h     |    2 +-
>  3 files changed, 19 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 2720eb5..bc9b1c8 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -546,11 +546,11 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data)
>  			if (work->flip_queued_ring) {
>  				seq_printf(m, "Flip queued on %s at seqno %u, next seqno %u [current breadcrumb %u], completed? %d\n",
>  					   work->flip_queued_ring->name,
> -					   work->flip_queued_seqno,
> +					   i915_gem_request_get_seqno(work->flip_queued_req),
>  					   dev_priv->next_seqno,
>  					   work->flip_queued_ring->get_seqno(work->flip_queued_ring, true),
>  					   i915_seqno_passed(work->flip_queued_ring->get_seqno(work->flip_queued_ring, true),
> -							     work->flip_queued_seqno));
> +							     i915_gem_request_get_seqno(work->flip_queued_req)));
>  			} else
>  				seq_printf(m, "Flip not associated with any ring\n");
>  			seq_printf(m, "Flip queued on frame %d, (was ready on frame %d), now %d\n",
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 98a5ed0..4a801e4 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -9669,10 +9669,18 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
>  		return false;
>  
>  	if (work->flip_ready_vblank == 0) {
> -		if (work->flip_queued_ring &&
> -		    !i915_seqno_passed(work->flip_queued_ring->get_seqno(work->flip_queued_ring, true),
> -				       work->flip_queued_seqno))
> -			return false;
> +		if (work->flip_queued_ring) {
> +			uint32_t s1 = work->flip_queued_ring->get_seqno(
> +					       work->flip_queued_ring, true);
> +			uint32_t s2 = i915_gem_request_get_seqno(
> +						      work->flip_queued_req);
> +			if (!i915_seqno_passed(s1, s2))
> +				return false;
> +
> +			i915_gem_request_unreference_irq(work->flip_queued_req);
> +			work->flip_queued_req  = NULL;
> +			work->flip_queued_ring = NULL;

Ok, here's the next one. I've fixed this up with


diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1df3387af59b..c8eb109acc3b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9122,6 +9122,11 @@ static void intel_unpin_work_fn(struct work_struct *__work)
 	drm_gem_object_unreference(&work->old_fb_obj->base);
 
 	intel_update_fbc(dev);
+
+	if (work->flip_queued_req)
+		i915_gem_request_unreference_irq(work->flip_queued_req);
+	work->flip_queued_req  = NULL;
+	work->flip_queued_ring = NULL;
 	mutex_unlock(&dev->struct_mutex);
 
 	intel_frontbuffer_flip_complete(dev, INTEL_FRONTBUFFER_PRIMARY(pipe));
@@ -9733,10 +9738,6 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
 						      work->flip_queued_req);
 			if (!i915_seqno_passed(s1, s2))
 				return false;
-
-			i915_gem_request_unreference_irq(work->flip_queued_req);
-			work->flip_queued_req  = NULL;
-			work->flip_queued_ring = NULL;
 		}
 
 		work->flip_ready_vblank = drm_vblank_count(dev, intel_crtc->pipe);
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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