[PATCH v2 15/28] drm/i915: Convert 'flip_queued_seqno' into 'flip_queued_request'

[John.C.Harrison@Intel.com]

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>
---
 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 ca704af..d35e6e0 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 457d968..88f70db 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9484,10 +9484,18 @@ 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;
+		}
 
 		work->flip_ready_vblank = drm_vblank_count(dev, intel_crtc->pipe);
 	}
@@ -9651,8 +9659,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 		if (ret)
 			goto cleanup_unpin;
 
-		work->flip_queued_seqno =
-			     i915_gem_request_get_seqno(obj->last_write_req);
+		i915_gem_request_assign(&work->flip_queued_req,
+					obj->last_write_req);
 		work->flip_queued_ring = obj->ring;
 	} else {
 		ret = dev_priv->display.queue_flip(dev, crtc, fb, obj, ring,
@@ -9660,8 +9668,8 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 		if (ret)
 			goto cleanup_unpin;
 
-		work->flip_queued_seqno =
-		    i915_gem_request_get_seqno(intel_ring_get_request(ring));
+		i915_gem_request_assign(&work->flip_queued_req,
+					intel_ring_get_request(ring));
 		work->flip_queued_ring = ring;
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fbd1cab..ba4cfbb 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -705,7 +705,7 @@ struct intel_unpin_work {
 	u32 flip_count;
 	u32 gtt_offset;
 	struct intel_engine_cs *flip_queued_ring;
-	u32 flip_queued_seqno;
+	struct drm_i915_gem_request *flip_queued_req;
 	int flip_queued_vblank;
 	int flip_ready_vblank;
 	bool enable_stall_check;
-- 
1.7.9.5

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