drm/i915: Change GEM throttling to be 20ms like the comment says.
keithp didn't like the original 20ms plan because a cooperative client could
be starved by an uncooperative client. There may even have been problems
with cooperative clients versus cooperative clients. So keithp changed
throttle to just wait for the second to last seqno emitted by that client.
It worked well, until we started getting more round-trips to the server
due to DRI2 -- the server throttles in BlockHandler, and so if you did more
than one round trip after finishing your frame, you'd end up unintentionally
syncing to the swap.
Fix this by keeping track of the client's requests, so the client can wait
when it has an outstanding request over 20ms old. This should have
non-starving behavior, good behavior in the presence of restarts, and less
waiting. Improves high-settings openarena performance on my GM45 by 50%.
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 39f5c65..3fbd8a0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1481,14 +1481,19 @@
* Returned sequence numbers are nonzero on success.
*/
static uint32_t
-i915_add_request(struct drm_device *dev, uint32_t flush_domains)
+i915_add_request(struct drm_device *dev, struct drm_file *file_priv,
+ uint32_t flush_domains)
{
drm_i915_private_t *dev_priv = dev->dev_private;
+ struct drm_i915_file_private *i915_file_priv = NULL;
struct drm_i915_gem_request *request;
uint32_t seqno;
int was_empty;
RING_LOCALS;
+ if (file_priv != NULL)
+ i915_file_priv = file_priv->driver_priv;
+
request = drm_calloc(1, sizeof(*request), DRM_MEM_DRIVER);
if (request == NULL)
return 0;
@@ -1515,6 +1520,12 @@
request->emitted_jiffies = jiffies;
was_empty = list_empty(&dev_priv->mm.request_list);
list_add_tail(&request->list, &dev_priv->mm.request_list);
+ if (i915_file_priv) {
+ list_add_tail(&request->client_list,
+ &i915_file_priv->mm.request_list);
+ } else {
+ INIT_LIST_HEAD(&request->client_list);
+ }
/* Associate any objects on the flushing list matching the write
* domain we're flushing with our flush.
@@ -1664,6 +1675,7 @@
i915_gem_retire_request(dev, request);
list_del(&request->list);
+ list_del(&request->client_list);
drm_free(request, sizeof(*request), DRM_MEM_DRIVER);
} else
break;
@@ -1977,7 +1989,7 @@
i915_gem_flush(dev,
obj->write_domain,
obj->write_domain);
- i915_add_request(dev, obj->write_domain);
+ i915_add_request(dev, NULL, obj->write_domain);
obj = NULL;
continue;
@@ -2248,7 +2260,7 @@
i915_gem_flush(dev,
I915_GEM_GPU_DOMAINS,
I915_GEM_GPU_DOMAINS);
- seqno = i915_add_request(dev,
+ seqno = i915_add_request(dev, NULL,
I915_GEM_GPU_DOMAINS);
if (seqno == 0)
return -ENOMEM;
@@ -2452,7 +2464,7 @@
/* Queue the GPU write cache flushing we need. */
i915_gem_flush(dev, 0, obj->write_domain);
- seqno = i915_add_request(dev, obj->write_domain);
+ seqno = i915_add_request(dev, NULL, obj->write_domain);
obj->write_domain = 0;
i915_gem_object_move_to_active(obj, seqno);
}
@@ -3089,6 +3101,10 @@
/* 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.
*/
@@ -3097,15 +3113,25 @@
{
struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
int ret = 0;
- uint32_t seqno;
+ unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
mutex_lock(&dev->struct_mutex);
- seqno = i915_file_priv->mm.last_gem_throttle_seqno;
- i915_file_priv->mm.last_gem_throttle_seqno =
- i915_file_priv->mm.last_gem_seqno;
- if (seqno)
- ret = i915_wait_request(dev, seqno);
+ while (!list_empty(&i915_file_priv->mm.request_list)) {
+ struct drm_i915_gem_request *request;
+
+ request = list_first_entry(&i915_file_priv->mm.request_list,
+ struct drm_i915_gem_request,
+ client_list);
+
+ if (time_after_eq(request->emitted_jiffies, recent_enough))
+ break;
+
+ ret = i915_wait_request(dev, request->seqno);
+ if (ret != 0)
+ break;
+ }
mutex_unlock(&dev->struct_mutex);
+
return ret;
}
@@ -3187,7 +3213,6 @@
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
- struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
struct drm_i915_gem_execbuffer *args = data;
struct drm_i915_gem_exec_object *exec_list = NULL;
struct drm_gem_object **object_list = NULL;
@@ -3363,7 +3388,8 @@
dev->invalidate_domains,
dev->flush_domains);
if (dev->flush_domains)
- (void)i915_add_request(dev, dev->flush_domains);
+ (void)i915_add_request(dev, file_priv,
+ dev->flush_domains);
}
for (i = 0; i < args->buffer_count; i++) {
@@ -3412,9 +3438,8 @@
* *some* interrupts representing completion of buffers that we can
* wait on when trying to clear up gtt space).
*/
- seqno = i915_add_request(dev, flush_domains);
+ seqno = i915_add_request(dev, file_priv, flush_domains);
BUG_ON(seqno == 0);
- i915_file_priv->mm.last_gem_seqno = seqno;
for (i = 0; i < args->buffer_count; i++) {
struct drm_gem_object *obj = object_list[i];
@@ -3802,7 +3827,7 @@
*/
i915_gem_flush(dev, ~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT),
~(I915_GEM_DOMAIN_CPU|I915_GEM_DOMAIN_GTT));
- seqno = i915_add_request(dev, ~I915_GEM_DOMAIN_CPU);
+ seqno = i915_add_request(dev, NULL, ~I915_GEM_DOMAIN_CPU);
if (seqno == 0) {
mutex_unlock(&dev->struct_mutex);
@@ -4352,3 +4377,17 @@
drm_agp_chipset_flush(dev);
return 0;
}
+
+void i915_gem_release(struct drm_device * dev, struct drm_file *file_priv)
+{
+ struct drm_i915_file_private *i915_file_priv = file_priv->driver_priv;
+
+ /* Clean up our request list when the client is going away, so that
+ * later retire_requests won't dereference our soon-to-be-gone
+ * file_priv.
+ */
+ mutex_lock(&dev->struct_mutex);
+ while (!list_empty(&i915_file_priv->mm.request_list))
+ list_del_init(i915_file_priv->mm.request_list.next);
+ mutex_unlock(&dev->struct_mutex);
+}