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[gem] Replace ring throttling hack with actual time measurement.

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Eric Anholt 2008-05-20 16:27:05 -07:00
parent 54fa32cdfe
commit d6f7968577
2 changed files with 30 additions and 22 deletions
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49
linux-core/i915_gem.c
View File

@ -154,6 +154,7 @@ i915_add_request(struct drm_device *dev)
DRM_DEBUG("%d\n", seqno);
request->seqno = seqno;
request->emitted_jiffies = jiffies;
list_add_tail(&request->list, &dev_priv->mm.request_list);
return seqno;
@ -966,34 +967,38 @@ i915_dispatch_gem_execbuffer(struct drm_device *dev,
return 0;
}
/*
* Kludge -- wait for almost all rendering to complete
* before queuing more. This uses interrupts, so the wakeup
* occurs without any delay.
/* Throttle our rendering by waiting until the ring has completed our requests
* emitted over 20 msec ago.
*
* 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_wait_space(struct drm_device *dev)
i915_gem_ring_throttle(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_ring_buffer_t *ring = &(dev_priv->ring);
struct drm_i915_gem_object *obj_priv, *last_priv = NULL;
int ret = 0;
mutex_lock(&dev->struct_mutex);
while (ring->space + 1024 < dev_priv->ring.Size &&
!list_empty(&dev_priv->mm.active_list)) {
obj_priv = list_first_entry(&dev_priv->mm.active_list,
struct drm_i915_gem_object,
list);
if (obj_priv == last_priv)
break;
drm_gem_object_reference(obj_priv->obj);
ret = i915_gem_object_wait_rendering(obj_priv->obj);
drm_gem_object_unreference(obj_priv->obj);
if (ret)
break;
last_priv = obj_priv;
i915_kernel_lost_context(dev);
while (!list_empty(&dev_priv->mm.request_list)) {
struct drm_i915_gem_request *request;
request = list_first_entry(&dev_priv->mm.request_list,
struct drm_i915_gem_request,
list);
/* Break out if we're close enough. */
if (jiffies_to_msecs(jiffies - request->emitted_jiffies) < 20) {
mutex_unlock(&dev->struct_mutex);
return 0;
}
/* Wait on the last request if not. */
ret = i915_wait_request(dev, request->seqno);
if (ret != 0) {
mutex_unlock(&dev->struct_mutex);
return ret;
}
}
mutex_unlock(&dev->struct_mutex);
return ret;
@ -1019,7 +1024,7 @@ i915_gem_execbuffer(struct drm_device *dev, void *data,
#endif
i915_kernel_lost_context(dev);
ret = i915_gem_wait_space(dev);
ret = i915_gem_ring_throttle(dev);
if (ret)
return ret;

3
shared-core/i915_drv.h
View File

@ -331,6 +331,9 @@ struct drm_i915_gem_request {
/** GEM sequence number associated with this request. */
uint32_t seqno;
/** Time at which this request was emitted, in jiffies. */
unsigned long emitted_jiffies;
struct list_head list;
};