On 9/9/2022 10:55 AM, Tvrtko Ursulin wrote:
On 08/09/2022 21:07, Nirmoy Das wrote:
i915_gem_drain_freed_objects() might not be enough to
free all the objects and RCU delayed work might get
scheduled after the i915 device struct gets freed.
Call i915_gem_drain_workqueue() to catch all RCU delayed work.
Suggested-by: Chris Wilson <chris.p.wilson@xxxxxxxxx>
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c
b/drivers/gpu/drm/i915/i915_gem.c
index 0f49ec9d494a..e8a053eaaa89 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1254,7 +1254,7 @@ void i915_gem_init_early(struct
drm_i915_private *dev_priv)
void i915_gem_cleanup_early(struct drm_i915_private *dev_priv)
{
- i915_gem_drain_freed_objects(dev_priv);
+ i915_gem_drain_workqueue(dev_priv);
GEM_BUG_ON(!llist_empty(&dev_priv->mm.free_list));
GEM_BUG_ON(atomic_read(&dev_priv->mm.free_count));
drm_WARN_ON(&dev_priv->drm, dev_priv->mm.shrink_count);
Help me spot the place where RCU free worker schedules itself back to
free more objects - if I got the rationale here right?
(Sorry for late reply, was on leave last week.)
I had to clarify this with Chris. So when driver frees a obj, it does
dma_resv_fini() which will drop reference
for all the fences in it and a fence might reference to an object and
upon release of that fence can trigger a release reference to an object.
Regards,
Nirmoy
Regards,
Tvrtko
