From e87666b52f00fdb373349c4e6e1c09ced964e3c5 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 4 Apr 2016 14:46:43 +0100 Subject: [PATCH] drm/i915/shrinker: Hook up vmap allocation failure notifier If the core runs out of vmap address space, it will call a notifier in case any driver can reap some of its vmaps. As i915.ko is possibily holding onto vmap address space that could be recovered, hook into the notifier chain and try and reap objects holding onto vmaps. Signed-off-by: Chris Wilson Cc: Andrew Morton Cc: David Rientjes Cc: Roman Pen Cc: Mel Gorman Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Cc: Joonas Lahtinen Cc: Tvrtko Ursulin Cc: Mika Kahola Link: http://patchwork.freedesktop.org/patch/msgid/1459777603-23618-4-git-send-email-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_gem_shrinker.c | 39 ++++++++++++++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index dd187727c813..6443745d4182 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1257,6 +1257,7 @@ struct i915_gem_mm { struct i915_hw_ppgtt *aliasing_ppgtt; struct notifier_block oom_notifier; + struct notifier_block vmap_notifier; struct shrinker shrinker; bool shrinker_no_lock_stealing; diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c index e391ee3ec486..be7501afb59e 100644 --- a/drivers/gpu/drm/i915/i915_gem_shrinker.c +++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -356,6 +357,40 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr) return NOTIFY_DONE; } +static int +i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr) +{ + struct drm_i915_private *dev_priv = + container_of(nb, struct drm_i915_private, mm.vmap_notifier); + struct drm_device *dev = dev_priv->dev; + unsigned long timeout = msecs_to_jiffies(5000) + 1; + unsigned long freed_pages; + bool was_interruptible; + bool unlock; + + while (!i915_gem_shrinker_lock(dev, &unlock) && --timeout) { + schedule_timeout_killable(1); + if (fatal_signal_pending(current)) + return NOTIFY_DONE; + } + if (timeout == 0) { + pr_err("Unable to purge GPU vmaps due to lock contention.\n"); + return NOTIFY_DONE; + } + + was_interruptible = dev_priv->mm.interruptible; + dev_priv->mm.interruptible = false; + + freed_pages = i915_gem_shrink_all(dev_priv); + + dev_priv->mm.interruptible = was_interruptible; + if (unlock) + mutex_unlock(&dev->struct_mutex); + + *(unsigned long *)ptr += freed_pages; + return NOTIFY_DONE; +} + /** * i915_gem_shrinker_init - Initialize i915 shrinker * @dev_priv: i915 device @@ -371,6 +406,9 @@ void i915_gem_shrinker_init(struct drm_i915_private *dev_priv) dev_priv->mm.oom_notifier.notifier_call = i915_gem_shrinker_oom; WARN_ON(register_oom_notifier(&dev_priv->mm.oom_notifier)); + + dev_priv->mm.vmap_notifier.notifier_call = i915_gem_shrinker_vmap; + WARN_ON(register_vmap_purge_notifier(&dev_priv->mm.vmap_notifier)); } /** @@ -381,6 +419,7 @@ void i915_gem_shrinker_init(struct drm_i915_private *dev_priv) */ void i915_gem_shrinker_cleanup(struct drm_i915_private *dev_priv) { + WARN_ON(unregister_vmap_purge_notifier(&dev_priv->mm.vmap_notifier)); WARN_ON(unregister_oom_notifier(&dev_priv->mm.oom_notifier)); unregister_shrinker(&dev_priv->mm.shrinker); } -- 2.11.0