[Intel-gfx] [PATCH] drm/i915: Remove toplevel struct_mutex locking from debugfs/i915_drop_caches

[Chris Wilson]

I have a plan to write a quick test to exercise concurrent usage of
i915_gem_shrink(), the simplest way looks to be to have multiple threads
using debugfs/i915_drop_caches. However, we currently take one lock over
the entire function, serialising the calls into i915_gem_shrink() so
reduce the lock coverage.

Testcase: igt/gem_shrink/reclaim
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 25b97788b906..bd16db60164c 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4116,26 +4116,28 @@ i915_drop_caches_set(void *data, u64 val)
 {
 	struct drm_i915_private *dev_priv = data;
 	struct drm_device *dev = &dev_priv->drm;
-	int ret;
+	int ret = 0;
 
 	DRM_DEBUG("Dropping caches: 0x%08llx\n", val);
 
 	/* No need to check and wait for gpu resets, only libdrm auto-restarts
 	 * on ioctls on -EAGAIN. */
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
-	if (ret)
-		return ret;
-
-	if (val & DROP_ACTIVE) {
-		ret = i915_gem_wait_for_idle(dev_priv,
-					     I915_WAIT_INTERRUPTIBLE |
-					     I915_WAIT_LOCKED);
+	if (val & (DROP_ACTIVE | DROP_RETIRE)) {
+		ret = mutex_lock_interruptible(&dev->struct_mutex);
 		if (ret)
-			goto unlock;
-	}
+			return ret;
 
-	if (val & DROP_RETIRE)
-		i915_gem_retire_requests(dev_priv);
+		if (val & DROP_ACTIVE) {
+			ret = i915_gem_wait_for_idle(dev_priv,
+						     I915_WAIT_INTERRUPTIBLE |
+						     I915_WAIT_LOCKED);
+		}
+
+		if (val & DROP_RETIRE)
+			i915_gem_retire_requests(dev_priv);
+
+		mutex_unlock(&dev->struct_mutex);
+	}
 
 	lockdep_set_current_reclaim_state(GFP_KERNEL);
 	if (val & DROP_BOUND)
@@ -4148,9 +4150,6 @@ i915_drop_caches_set(void *data, u64 val)
 		i915_gem_shrink_all(dev_priv);
 	lockdep_clear_current_reclaim_state();
 
-unlock:
-	mutex_unlock(&dev->struct_mutex);
-
 	if (val & DROP_FREED) {
 		synchronize_rcu();
 		i915_gem_drain_freed_objects(dev_priv);
-- 
2.11.0