Sometimes a test has to wait for RCU to complete a grace period and
perform its callbacks, for example waiting for a close(fd) to actually
perform the fput(filp) and so trigger all the callbacks such as closing
GEM contexts. There is no trivial means of triggering an RCU barrier
from userspace, so add one for our convenience in
debugfs/i915_drop_caches
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 29c918a1580e..c7fc402bd8f3 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3513,6 +3513,7 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
#define DROP_IDLE BIT(6)
#define DROP_RESET_ACTIVE BIT(7)
#define DROP_RESET_SEQNO BIT(8)
+#define DROP_RCU BIT(9)
#define DROP_ALL (DROP_UNBOUND | \
DROP_BOUND | \
DROP_RETIRE | \
@@ -3521,7 +3522,8 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
DROP_SHRINK_ALL |\
DROP_IDLE | \
DROP_RESET_ACTIVE | \
- DROP_RESET_SEQNO)
+ DROP_RESET_SEQNO | \
+ DROP_RCU)
static int
i915_drop_caches_get(void *data, u64 *val)
{
@@ -3573,6 +3575,9 @@ i915_drop_caches_set(void *data, u64 val)
i915_gem_shrink_all(i915);
fs_reclaim_release(GFP_KERNEL);
+ if (val & DROP_RCU)
+ rcu_barrier();
+
if (val & DROP_FREED)
i915_gem_drain_freed_objects(i915);
--
2.23.0
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