[PATCH 08/53] drm/i915: Update alloc_request to return the allocated request

[John.C.Harrison@Intel.com]

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

The alloc_request() function does not actually return the newly allocated
request. Instead, it must be pulled from ring->outstanding_lazy_request. This
patch fixes this so that code can create a request and start using it knowing
exactly which request it actually owns.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h            |    3 ++-
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    3 ++-
 drivers/gpu/drm/i915/intel_lrc.c           |   13 +++++++++----
 drivers/gpu/drm/i915/intel_lrc.h           |    3 ++-
 drivers/gpu/drm/i915/intel_ringbuffer.c    |   14 ++++++++++----
 drivers/gpu/drm/i915/intel_ringbuffer.h    |    3 ++-
 6 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 87a4a2e..90223f208 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1909,7 +1909,8 @@ struct drm_i915_private {
 	/* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
 	struct {
 		int (*alloc_request)(struct intel_engine_cs *ring,
-				     struct intel_context *ctx);
+				     struct intel_context *ctx,
+				     struct drm_i915_gem_request **req_out);
 		int (*do_execbuf)(struct i915_execbuffer_params *params,
 				  struct drm_i915_gem_execbuffer2 *args,
 				  struct list_head *vmas);
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 61471e9..37dcc6f 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1353,6 +1353,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	struct i915_address_space *vm;
 	struct i915_execbuffer_params params_master; /* XXX: will be removed later */
 	struct i915_execbuffer_params *params = &params_master;
+	struct drm_i915_gem_request *request;
 	const u32 ctx_id = i915_execbuffer2_get_context_id(*args);
 	u32 dispatch_flags;
 	int ret;
@@ -1531,7 +1532,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		params->batch_obj_vm_offset = i915_gem_obj_offset(batch_obj, vm);
 
 	/* Allocate a request for this batch buffer nice and early. */
-	ret = dev_priv->gt.alloc_request(ring, ctx);
+	ret = dev_priv->gt.alloc_request(ring, ctx, &request);
 	if (ret)
 		goto err;
 
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 8628abf..c3c783f 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -857,13 +857,17 @@ void intel_lr_context_unpin(struct intel_engine_cs *ring,
 }
 
 int intel_logical_ring_alloc_request(struct intel_engine_cs *ring,
-				     struct intel_context *ctx)
+				     struct intel_context *ctx,
+				     struct drm_i915_gem_request **req_out)
 {
 	struct drm_i915_gem_request *request;
 	struct drm_i915_private *dev_private = ring->dev->dev_private;
 	int ret;
 
-	if (ring->outstanding_lazy_request)
+	if (!req_out)
+		return -EINVAL;
+
+	if ((*req_out = ring->outstanding_lazy_request) != NULL)
 		return 0;
 
 	request = kzalloc(sizeof(*request), GFP_KERNEL);
@@ -898,7 +902,7 @@ int intel_logical_ring_alloc_request(struct intel_engine_cs *ring,
 	i915_gem_context_reference(request->ctx);
 	request->ringbuf = ctx->engine[ring->id].ringbuf;
 
-	ring->outstanding_lazy_request = request;
+	*req_out = ring->outstanding_lazy_request = request;
 	return 0;
 }
 
@@ -1051,6 +1055,7 @@ static int logical_ring_prepare(struct intel_ringbuffer *ringbuf,
 int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,
 			     struct intel_context *ctx, int num_dwords)
 {
+	struct drm_i915_gem_request *req;
 	struct intel_engine_cs *ring = ringbuf->ring;
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1066,7 +1071,7 @@ int intel_logical_ring_begin(struct intel_ringbuffer *ringbuf,
 		return ret;
 
 	/* Preallocate the olr before touching the ring */
-	ret = intel_logical_ring_alloc_request(ring, ctx);
+	ret = intel_logical_ring_alloc_request(ring, ctx, &req);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 3cc38bd..77de8ac 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -37,7 +37,8 @@
 
 /* Logical Rings */
 int __must_check intel_logical_ring_alloc_request(struct intel_engine_cs *ring,
-						  struct intel_context *ctx);
+						  struct intel_context *ctx,
+						  struct drm_i915_gem_request **req_out);
 void intel_logical_ring_stop(struct intel_engine_cs *ring);
 void intel_logical_ring_cleanup(struct intel_engine_cs *ring);
 int intel_logical_rings_init(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 635707a..1a9f884 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2164,13 +2164,18 @@ int intel_ring_idle(struct intel_engine_cs *ring)
 }
 
 int
-intel_ring_alloc_request(struct intel_engine_cs *ring, struct intel_context *ctx)
+intel_ring_alloc_request(struct intel_engine_cs *ring,
+			 struct intel_context *ctx,
+			 struct drm_i915_gem_request **req_out)
 {
 	int ret;
 	struct drm_i915_gem_request *request;
 	struct drm_i915_private *dev_private = ring->dev->dev_private;
 
-	if (ring->outstanding_lazy_request)
+	if (!req_out)
+		return -EINVAL;
+
+	if ((*req_out = ring->outstanding_lazy_request) != NULL)
 		return 0;
 
 	request = kzalloc(sizeof(*request), GFP_KERNEL);
@@ -2188,7 +2193,7 @@ intel_ring_alloc_request(struct intel_engine_cs *ring, struct intel_context *ctx
 		return ret;
 	}
 
-	ring->outstanding_lazy_request = request;
+	*req_out = ring->outstanding_lazy_request = request;
 	return 0;
 }
 
@@ -2216,6 +2221,7 @@ static int __intel_ring_prepare(struct intel_engine_cs *ring,
 int intel_ring_begin(struct intel_engine_cs *ring,
 		     int num_dwords)
 {
+	struct drm_i915_gem_request *req;
 	struct drm_i915_private *dev_priv = ring->dev->dev_private;
 	int ret;
 
@@ -2229,7 +2235,7 @@ int intel_ring_begin(struct intel_engine_cs *ring,
 		return ret;
 
 	/* Preallocate the olr before touching the ring */
-	ret = intel_ring_alloc_request(ring, NULL);
+	ret = intel_ring_alloc_request(ring, NULL, &req);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 2fd960a..4f8a14a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -393,7 +393,8 @@ void intel_cleanup_ring_buffer(struct intel_engine_cs *ring);
 int __must_check intel_ring_begin(struct intel_engine_cs *ring, int n);
 int __must_check intel_ring_cacheline_align(struct intel_engine_cs *ring);
 int __must_check intel_ring_alloc_request(struct intel_engine_cs *ring,
-					  struct intel_context *ctx);
+					  struct intel_context *ctx,
+					  struct drm_i915_gem_request **req_out);
 static inline void intel_ring_emit(struct intel_engine_cs *ring,
 				   u32 data)
 {
-- 
1.7.9.5

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