drm/i915: Move GEM client throttling to its own file

Continuing the decluttering of i915_gem.c by moving the client self
throttling into its own file.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-13-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/Makefile

@@ -104,6 +104,7 @@ gem-y += \
 	gem/i915_gem_shmem.o \
 	gem/i915_gem_shrinker.o \
 	gem/i915_gem_stolen.o \
+	gem/i915_gem_throttle.o \
 	gem/i915_gem_tiling.o \
 	gem/i915_gem_userptr.o \
 	gem/i915_gem_wait.o \

drivers/gpu/drm/i915/gem/i915_gem_throttle.c

@@ -0,0 +1,73 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2014-2016 Intel Corporation
+ */
+
+#include <linux/jiffies.h>
+
+#include <drm/drm_file.h>
+
+#include "i915_drv.h"
+#include "i915_gem_ioctls.h"
+#include "i915_gem_object.h"
+
+/*
+ * 20ms is a fairly arbitrary limit (greater than the average frame time)
+ * chosen to prevent the CPU getting more than a frame ahead of the GPU
+ * (when using lax throttling for the frontbuffer). We also use it to
+ * offer free GPU waitboosts for severely congested workloads.
+ */
+#define DRM_I915_THROTTLE_JIFFIES msecs_to_jiffies(20)
+
+/*
+ * Throttle our rendering by waiting until the ring has completed our requests
+ * emitted over 20 msec ago.
+ *
+ * Note that if we were to use the current jiffies each time around the loop,
+ * we wouldn't escape the function with any frames outstanding if the time to
+ * render a frame was over 20ms.
+ *
+ * This should get us reasonable parallelism between CPU and GPU but also
+ * relatively low latency when blocking on a particular request to finish.
+ */
+int
+i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
+			struct drm_file *file)
+{
+	struct drm_i915_file_private *file_priv = file->driver_priv;
+	unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES;
+	struct i915_request *request, *target = NULL;
+	long ret;
+
+	/* ABI: return -EIO if already wedged */
+	ret = i915_terminally_wedged(to_i915(dev));
+	if (ret)
+		return ret;
+
+	spin_lock(&file_priv->mm.lock);
+	list_for_each_entry(request, &file_priv->mm.request_list, client_link) {
+		if (time_after_eq(request->emitted_jiffies, recent_enough))
+			break;
+
+		if (target) {
+			list_del(&target->client_link);
+			target->file_priv = NULL;
+		}
+
+		target = request;
+	}
+	if (target)
+		i915_request_get(target);
+	spin_unlock(&file_priv->mm.lock);
+
+	if (!target)
+		return 0;
+
+	ret = i915_request_wait(target,
+				I915_WAIT_INTERRUPTIBLE,
+				MAX_SCHEDULE_TIMEOUT);
+	i915_request_put(target);
+
+	return ret < 0 ? ret : 0;
+}

drivers/gpu/drm/i915/i915_drv.h

@@ -213,12 +213,6 @@ struct drm_i915_file_private {
 	struct {
 		spinlock_t lock;
 		struct list_head request_list;
-/* 20ms is a fairly arbitrary limit (greater than the average frame time)
- * chosen to prevent the CPU getting more than a frame ahead of the GPU
- * (when using lax throttling for the frontbuffer). We also use it to
- * offer free GPU waitboosts for severely congested workloads.
- */
-#define DRM_I915_THROTTLE_JIFFIES msecs_to_jiffies(20)
 	} mm;
 
 	struct idr context_idr;

drivers/gpu/drm/i915/i915_gem.c

@@ -1012,57 +1012,6 @@ int i915_gem_wait_for_idle(struct drm_i915_private *i915,
 	return 0;
 }
 
-/* Throttle our rendering by waiting until the ring has completed our requests
- * emitted over 20 msec ago.
- *
- * Note that if we were to use the current jiffies each time around the loop,
- * we wouldn't escape the function with any frames outstanding if the time to
- * render a frame was over 20ms.
- *
- * This should get us reasonable parallelism between CPU and GPU but also
- * relatively low latency when blocking on a particular request to finish.
- */
-static int
-i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
-{
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES;
-	struct i915_request *request, *target = NULL;
-	long ret;
-
-	/* ABI: return -EIO if already wedged */
-	ret = i915_terminally_wedged(dev_priv);
-	if (ret)
-		return ret;
-
-	spin_lock(&file_priv->mm.lock);
-	list_for_each_entry(request, &file_priv->mm.request_list, client_link) {
-		if (time_after_eq(request->emitted_jiffies, recent_enough))
-			break;
-
-		if (target) {
-			list_del(&target->client_link);
-			target->file_priv = NULL;
-		}
-
-		target = request;
-	}
-	if (target)
-		i915_request_get(target);
-	spin_unlock(&file_priv->mm.lock);
-
-	if (target == NULL)
-		return 0;
-
-	ret = i915_request_wait(target,
-				I915_WAIT_INTERRUPTIBLE,
-				MAX_SCHEDULE_TIMEOUT);
-	i915_request_put(target);
-
-	return ret < 0 ? ret : 0;
-}
-
 struct i915_vma *
 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 			 const struct i915_ggtt_view *view,
@@ -1142,13 +1091,6 @@ i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 	return vma;
 }
 
-int
-i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
-			struct drm_file *file_priv)
-{
-	return i915_gem_ring_throttle(dev, file_priv);
-}
-
 int
 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv)