[PATCH 01/13] drm/i915: add context parameter to i915_switch_context()

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

In preparation for the next commit, return context that
was switch to from i915_switch_context().

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h            |    3 ++-
 drivers/gpu/drm/i915/i915_gem.c            |    2 +-
 drivers/gpu/drm/i915/i915_gem_context.c    |   36 ++++++++++++++++++----------
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |    2 +-
 4 files changed, 27 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e95337c..27459ec 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1671,7 +1671,8 @@ void i915_gem_context_init(struct drm_device *dev);
 void i915_gem_context_fini(struct drm_device *dev);
 void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
 int i915_switch_context(struct intel_ring_buffer *ring,
-			struct drm_file *file, int to_id);
+			struct drm_file *file, int to_id,
+			struct i915_hw_context **ctx);
 int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 				  struct drm_file *file);
 int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8413ffc..61610f3 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2517,7 +2517,7 @@ int i915_gpu_idle(struct drm_device *dev)
 
 	/* Flush everything onto the inactive list. */
 	for_each_ring(ring, dev_priv, i) {
-		ret = i915_switch_context(ring, NULL, DEFAULT_CONTEXT_ID);
+		ret = i915_switch_context(ring, NULL, DEFAULT_CONTEXT_ID, NULL);
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 21177d9..4125919 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -428,10 +428,9 @@ static int do_switch(struct i915_hw_context *to)
 /**
  * i915_switch_context() - perform a GPU context switch.
  * @ring: ring for which we'll execute the context switch
- * @file_priv: file_priv associated with the context, may be NULL
- * @id: context id number
- * @seqno: sequence number by which the new context will be switched to
- * @flags:
+ * @file: file associated with the context, may be NULL
+ * @to_id: context id number
+ * @ctx: i915_hw_context we switched to, may be NULL
  *
  * The context life cycle is simple. The context refcount is incremented and
  * decremented by 1 and create and destroy. If the context is in use by the GPU,
@@ -440,29 +439,40 @@ static int do_switch(struct i915_hw_context *to)
  */
 int i915_switch_context(struct intel_ring_buffer *ring,
 			struct drm_file *file,
-			int to_id)
+			int to_id,
+			struct i915_hw_context **ctx)
 {
 	struct drm_i915_private *dev_priv = ring->dev->dev_private;
-	struct i915_hw_context *to;
+	struct i915_hw_context *to = NULL;
+	int ret = 0;
 
 	if (dev_priv->hw_contexts_disabled)
-		return 0;
+		goto out;
 
 	if (ring != &dev_priv->ring[RCS])
-		return 0;
+		goto out;
 
 	if (to_id == DEFAULT_CONTEXT_ID) {
 		to = ring->default_context;
 	} else {
-		if (file == NULL)
-			return -EINVAL;
+		if (file == NULL) {
+			ret = -EINVAL;
+			goto out;
+		}
 
 		to = i915_gem_context_get(file->driver_priv, to_id);
-		if (to == NULL)
-			return -ENOENT;
+		if (to == NULL) {
+			ret = -ENOENT;
+			goto out;
+		}
 	}
 
-	return do_switch(to);
+	ret = do_switch(to);
+out:
+	if (ctx)
+		*ctx = to;
+
+	return ret;
 }
 
 int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 2f2daeb..499d025 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1017,7 +1017,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	if (ret)
 		goto err;
 
-	ret = i915_switch_context(ring, file, ctx_id);
+	ret = i915_switch_context(ring, file, ctx_id, NULL);
 	if (ret)
 		goto err;
 
-- 
1.7.9.5