From 7cf3fd29fe058a0bfc2ba7e889d1b360398be161 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Sun, 25 May 2008 20:45:20 -0700
Subject: [PATCH] [intel-gem] Add DRM_I915_GEM_BUSY ioctl to check for idle
 buffers.

This new ioctl returns whether re-using the buffer would force a wait.
---
 linux-core/i915_gem.c  | 25 +++++++++++++++++++++++++
 shared-core/i915_dma.c |  1 +
 shared-core/i915_drm.h |  9 +++++++++
 shared-core/i915_drv.h |  2 ++
 4 files changed, 37 insertions(+)

diff --git a/linux-core/i915_gem.c b/linux-core/i915_gem.c
index b5c8774..99dc00f 100644
--- a/linux-core/i915_gem.c
+++ b/linux-core/i915_gem.c
@@ -1471,6 +1471,31 @@ i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
+int
+i915_gem_busy_ioctl(struct drm_device *dev, void *data,
+		    struct drm_file *file_priv)
+{
+	struct drm_i915_gem_busy *args = data;
+	struct drm_gem_object *obj;
+	struct drm_i915_gem_object *obj_priv;
+
+	mutex_lock(&dev->struct_mutex);
+	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (obj == NULL) {
+		DRM_ERROR("Bad handle in i915_gem_busy_ioctl(): %d\n",
+			  args->handle);
+		mutex_unlock(&dev->struct_mutex);
+		return -EINVAL;
+	}
+
+	obj_priv = obj->driver_private;
+	args->busy = obj_priv->active;
+	
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+	return 0;
+}
+
 int i915_gem_init_object(struct drm_gem_object *obj)
 {
 	struct drm_i915_gem_object *obj_priv;
diff --git a/shared-core/i915_dma.c b/shared-core/i915_dma.c
index 1fc617d..76cd45f 100644
--- a/shared-core/i915_dma.c
+++ b/shared-core/i915_dma.c
@@ -1180,6 +1180,7 @@ struct drm_ioctl_desc i915_ioctls[] = {
 	DRM_IOCTL_DEF(DRM_I915_GEM_EXECBUFFER, i915_gem_execbuffer, DRM_AUTH),
 	DRM_IOCTL_DEF(DRM_I915_GEM_PIN, i915_gem_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
 	DRM_IOCTL_DEF(DRM_I915_GEM_UNPIN, i915_gem_unpin_ioctl, DRM_AUTH|DRM_ROOT_ONLY),
+	DRM_IOCTL_DEF(DRM_I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH),
 };
 
 int i915_max_ioctl = DRM_ARRAY_SIZE(i915_ioctls);
diff --git a/shared-core/i915_drm.h b/shared-core/i915_drm.h
index b50471f..a8e09e7 100644
--- a/shared-core/i915_drm.h
+++ b/shared-core/i915_drm.h
@@ -180,6 +180,7 @@ typedef struct drm_i915_sarea {
 #define DRM_I915_GEM_EXECBUFFER	0x14
 #define DRM_I915_GEM_PIN	0x15
 #define DRM_I915_GEM_UNPIN	0x16
+#define DRM_I915_GEM_BUSY	0x17
 
 #define DRM_IOCTL_I915_INIT		DRM_IOW( DRM_COMMAND_BASE + DRM_I915_INIT, drm_i915_init_t)
 #define DRM_IOCTL_I915_FLUSH		DRM_IO ( DRM_COMMAND_BASE + DRM_I915_FLUSH)
@@ -203,6 +204,7 @@ typedef struct drm_i915_sarea {
 #define DRM_IOCTL_I915_GEM_EXECBUFFER	DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER, struct drm_i915_gem_execbuffer)
 #define DRM_IOCTL_I915_GEM_PIN		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_PIN, struct drm_i915_gem_pin)
 #define DRM_IOCTL_I915_GEM_UNPIN	DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_UNPIN, struct drm_i915_gem_unpin)
+#define DRM_IOCTL_I915_GEM_BUSY		DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_BUSY, struct drm_i915_gem_busy)
 
 /* Asynchronous page flipping:
  */
@@ -536,5 +538,12 @@ struct drm_i915_gem_unpin {
 	uint32_t pad;
 };
 
+struct drm_i915_gem_busy {
+	/** Handle of the buffer to check for busy */
+	uint32_t handle;
+	
+	/** Return busy status (1 if busy, 0 if idle) */
+	uint32_t busy;
+};
 
 #endif				/* _I915_DRM_H_ */
diff --git a/shared-core/i915_drv.h b/shared-core/i915_drv.h
index e217b78..04e149a 100644
--- a/shared-core/i915_drv.h
+++ b/shared-core/i915_drv.h
@@ -449,6 +449,8 @@ int i915_gem_pin_ioctl(struct drm_device *dev, void *data,
 		       struct drm_file *file_priv);
 int i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
 			 struct drm_file *file_priv);
+int i915_gem_busy_ioctl(struct drm_device *dev, void *data,
+			struct drm_file *file_priv);
 int i915_gem_init_object(struct drm_gem_object *obj);
 void i915_gem_free_object(struct drm_gem_object *obj);
 int i915_gem_set_domain(struct drm_gem_object *obj,
-- 
2.7.4