On 06/01/2017 15:22, Chris Wilson wrote:
As we now use a deferred free queue for objects, simply retiring the
active objects is not enough to immediately free them and recover their
mmap space - we must now also drain the freed object list.
Fixes: fbbd37b36fa5 ("drm/i915: Move object release to a freelist + worker"
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: <drm-intel-fixes@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 24 +++++++++++-------------
1 file changed, 11 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 94958437252a..f6f4ec894a7f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2090,23 +2090,21 @@ static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
int err;
err = drm_gem_create_mmap_offset(&obj->base);
- if (!err)
+ if (likely(!err))
return 0;
- /* We can idle the GPU locklessly to flush stale objects, but in order
- * to claim that space for ourselves, we need to take the big
- * struct_mutex to free the requests+objects and allocate our slot.
- */
- err = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
- if (err)
- return err;
+ /* Attempt to reap some mmap space from dead objects */
+ do {
+ err = i915_gem_wait_for_idle(dev_priv, I915_WAIT_INTERRUPTIBLE);
+ if (err)
+ break;
- err = i915_mutex_lock_interruptible(&dev_priv->drm);
- if (!err) {
- i915_gem_retire_requests(dev_priv);
+ i915_gem_drain_freed_objects(dev_priv);
err = drm_gem_create_mmap_offset(&obj->base);
- mutex_unlock(&dev_priv->drm.struct_mutex);
- }
+ if (!err)
+ break;
+
+ } while (flush_delayed_work(&dev_priv->gt.retire_work));
Would it be better to keep a direct retire in here, since while it waits
for the retire worker to run, someone might grab the mutex and then the
retire worker won't do anything? Unless flush_delayed_work would not
return in case work re-queues itself?
Regards,
Tvrtko
return err;
}
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