On 1/9/2019 03:16, Mika Kuoppala wrote:
Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index 16693dd4d019..bc230e43b98f 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -154,6 +154,7 @@ i915_gem_shrink(struct drm_i915_private *i915,
{ &i915->mm.bound_list, I915_SHRINK_BOUND },
{ NULL, 0 },
}, *phase;
+ intel_wakeref_t wakeref = 0;
unsigned long count = 0;
unsigned long scanned = 0;
bool unlock;
@@ -183,9 +184,11 @@ i915_gem_shrink(struct drm_i915_private *i915,
* device just to recover a little memory. If absolutely necessary,
* we will force the wake during oom-notifier.
*/
- if ((flags & I915_SHRINK_BOUND) &&
- !intel_runtime_pm_get_if_in_use(i915))
- flags &= ~I915_SHRINK_BOUND;
+ if (flags & I915_SHRINK_BOUND) {
+ wakeref = intel_runtime_pm_get_if_in_use(i915);
+ if (!wakeref)
+ flags &= ~I915_SHRINK_BOUND;
+ }
/*
* As we may completely rewrite the (un)bound list whilst unbinding
@@ -266,7 +269,7 @@ i915_gem_shrink(struct drm_i915_private *i915,
}
if (flags & I915_SHRINK_BOUND)
- intel_runtime_pm_put_unchecked(i915);
+ intel_runtime_pm_put(i915, wakeref);
This is ok but raises a question that did we have
GEM_BUG_ON(wakeref == 0) on pm_put? Perhaps not needed
per se as we do find that we don't have ref for 0.
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
There is a WARN not a BUG if pm_put() is called with a zero wakeref (in
the cancel_ function after the search fails to find a match with zero).
However, the flag checks mean that it can't happen from here.
John.
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