[Intel-gfx] [PATCH 1/6] drm/i915: Get runtime pm ref on i915_drop_caches_set

[Mika Kuoppala]

When we drop caches, this debugfs entry does hardware access later in
the chain, when fences are updated, so it needs a runtime pm ref.

Dropping caches is used by some igt/bat tests, so this fixes
some unclaimed register access traces.

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 24318b7..bd8ba7e 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4839,6 +4839,8 @@ i915_drop_caches_set(void *data, u64 val)
 	if (ret)
 		return ret;
 
+	intel_runtime_pm_get(dev_priv);
+
 	if (val & DROP_ACTIVE) {
 		ret = i915_gpu_idle(dev);
 		if (ret)
@@ -4855,6 +4857,7 @@ i915_drop_caches_set(void *data, u64 val)
 		i915_gem_shrink(dev_priv, LONG_MAX, I915_SHRINK_UNBOUND);
 
 unlock:
+	intel_runtime_pm_put(dev_priv);
 	mutex_unlock(&dev->struct_mutex);
 
 	return ret;
-- 
2.5.0