[Intel-gfx] [PATCH 50/53] drm/i915: Update intel_logical_ring_begin() to take a request structure

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

Now that everything above has been converted to use requests,
intel_logical_ring_begin() can be updated to take a request instead of a
ringbuf/context pair. This also means that it no longer needs to lazily allocate
a request if no-one happens to have done it earlier.

Note that this change makes the execlist signature the same as the legacy
version. Thus the two functions could be merged into a ring->begin() wrapper if
required.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c |   33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index b40501d..2911cf6 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -766,7 +766,7 @@ static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,
 /**
  * intel_logical_ring_begin() - prepare the logical ringbuffer to accept some commands
  *
- * @ringbuf: Logical ringbuffer.
+ * @request: The request to start some new work for
  * @num_dwords: number of DWORDs that we plan to write to the ringbuffer.
  *
  * The ringbuffer might not be ready to accept the commands right away (maybe it needs to
@@ -776,30 +776,27 @@ static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,
  *
  * Return: non-zero if the ringbuffer is not ready to be written to.
  */
-static int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,
-				    struct intel_context *ctx, int num_dwords)
+static int intel_logical_ring_begin(struct drm_i915_gem_request *req,
+				    int num_dwords)
 {
-	struct drm_i915_gem_request *req;
-	struct intel_engine_cs *ring = ringbuf->ring;
+	struct intel_engine_cs *ring = req->ring;
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;
 
+	WARN_ON(req == NULL);
+
 	ret = i915_gem_check_wedge(&dev_priv->gpu_error,
 				   dev_priv->mm.interruptible);
 	if (ret)
 		return ret;
 
-	ret = logical_ring_prepare(ringbuf, ctx, num_dwords * sizeof(uint32_t));
-	if (ret)
-		return ret;
-
-	/* Preallocate the olr before touching the ring */
-	ret = intel_logical_ring_alloc_request(ring, ctx, &req);
+	ret = logical_ring_prepare(req->ringbuf, req->ctx,
+				   num_dwords * sizeof(uint32_t));
 	if (ret)
 		return ret;
 
-	ringbuf->space -= num_dwords * sizeof(uint32_t);
+	req->ringbuf->space -= num_dwords * sizeof(uint32_t);
 	return 0;
 }
 
@@ -885,7 +882,7 @@ int intel_execlists_submission(struct i915_execbuffer_params *params,
 
 	if (ring == &dev_priv->ring[RCS] &&
 	    instp_mode != dev_priv->relative_constants_mode) {
-		ret = intel_logical_ring_begin(ringbuf, params->ctx, 4);
+		ret = intel_logical_ring_begin(params->request, 4);
 		if (ret)
 			return ret;
 
@@ -1091,7 +1088,7 @@ static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)
 	if (ret)
 		return ret;
 
-	ret = intel_logical_ring_begin(ringbuf, req->ctx, w->count * 2 + 2);
+	ret = intel_logical_ring_begin(req, w->count * 2 + 2);
 	if (ret)
 		return ret;
 
@@ -1173,7 +1170,7 @@ static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
 	bool ppgtt = !(dispatch_flags & I915_DISPATCH_SECURE);
 	int ret;
 
-	ret = intel_logical_ring_begin(ringbuf, req->ctx, 4);
+	ret = intel_logical_ring_begin(req, 4);
 	if (ret)
 		return ret;
 
@@ -1231,7 +1228,7 @@ static int gen8_emit_flush(struct drm_i915_gem_request *request,
 	uint32_t cmd;
 	int ret;
 
-	ret = intel_logical_ring_begin(ringbuf, request->ctx, 4);
+	ret = intel_logical_ring_begin(request, 4);
 	if (ret)
 		return ret;
 
@@ -1289,7 +1286,7 @@ static int gen8_emit_flush_render(struct drm_i915_gem_request *request,
 		flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
 	}
 
-	ret = intel_logical_ring_begin(ringbuf, request->ctx, 6);
+	ret = intel_logical_ring_begin(request, 6);
 	if (ret)
 		return ret;
 
@@ -1321,7 +1318,7 @@ static int gen8_emit_request(struct drm_i915_gem_request *request)
 	u32 cmd;
 	int ret;
 
-	ret = intel_logical_ring_begin(ringbuf, request->ctx, 6);
+	ret = intel_logical_ring_begin(request, 6);
 	if (ret)
 		return ret;
 
-- 
1.7.9.5