[PATCH 5/5] drm/i915: don't return seqno from ring->add_request()

[mika.kuoppala at intel.com (Mika Kuoppala)]

Sequence numbers are preallocated so make them immutable
in ring->add_request().

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c         |    2 +-
 drivers/gpu/drm/i915/intel_ringbuffer.c |   18 ++++++------------
 drivers/gpu/drm/i915/intel_ringbuffer.h |    2 +-
 3 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 858f14f..d95c34d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2047,7 +2047,7 @@ i915_add_request(struct intel_ring_buffer *ring,
 	 */
 	request_ring_position = intel_ring_get_tail(ring);
 
-	ret = ring->add_request(ring, &seqno);
+	ret = ring->add_request(ring, seqno);
 	if (ret) {
 		kfree(request);
 		return ret;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index ecbc5c5..44aa76f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -577,7 +577,7 @@ update_mboxes(struct intel_ring_buffer *ring,
  */
 static int
 gen6_add_request(struct intel_ring_buffer *ring,
-		 u32 *seqno)
+		 u32 seqno)
 {
 	u32 mbox1_reg;
 	u32 mbox2_reg;
@@ -590,13 +590,11 @@ gen6_add_request(struct intel_ring_buffer *ring,
 	mbox1_reg = ring->signal_mbox[0];
 	mbox2_reg = ring->signal_mbox[1];
 
-	*seqno = i915_gem_next_request_seqno(ring);
-
-	update_mboxes(ring, *seqno, mbox1_reg);
-	update_mboxes(ring, *seqno, mbox2_reg);
+	update_mboxes(ring, seqno, mbox1_reg);
+	update_mboxes(ring, seqno, mbox2_reg);
 	intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
 	intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
-	intel_ring_emit(ring, *seqno);
+	intel_ring_emit(ring, seqno);
 	intel_ring_emit(ring, MI_USER_INTERRUPT);
 	intel_ring_advance(ring);
 
@@ -654,9 +652,8 @@ do {									\
 
 static int
 pc_render_add_request(struct intel_ring_buffer *ring,
-		      u32 *result)
+		      u32 seqno)
 {
-	u32 seqno = i915_gem_next_request_seqno(ring);
 	struct pipe_control *pc = ring->private;
 	u32 scratch_addr = pc->gtt_offset + 128;
 	int ret;
@@ -700,7 +697,6 @@ pc_render_add_request(struct intel_ring_buffer *ring,
 	intel_ring_emit(ring, 0);
 	intel_ring_advance(ring);
 
-	*result = seqno;
 	return 0;
 }
 
@@ -889,9 +885,8 @@ bsd_ring_flush(struct intel_ring_buffer *ring,
 
 static int
 i9xx_add_request(struct intel_ring_buffer *ring,
-		 u32 *result)
+		 u32 seqno)
 {
-	u32 seqno;
 	int ret;
 
 	ret = intel_ring_begin(ring, 4);
@@ -906,7 +901,6 @@ i9xx_add_request(struct intel_ring_buffer *ring,
 	intel_ring_emit(ring, MI_USER_INTERRUPT);
 	intel_ring_advance(ring);
 
-	*result = seqno;
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 2ea7a31..66b9a3b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -71,7 +71,7 @@ struct  intel_ring_buffer {
 				  u32	invalidate_domains,
 				  u32	flush_domains);
 	int		(*add_request)(struct intel_ring_buffer *ring,
-				       u32 *seqno);
+				       u32 seqno);
 	/* Some chipsets are not quite as coherent as advertised and need
 	 * an expensive kick to force a true read of the up-to-date seqno.
 	 * However, the up-to-date seqno is not always required and the last
-- 
1.7.9.5