From 168cf367d7017a9d19522f8e59462c8b01c1212e Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 5 Apr 2016 10:22:25 +0100 Subject: [PATCH] drm/i915/shrinker: Refactor common uninterruptible locking Both the oom and vmap notifier callbacks have a loop to acquire the struct_mutex and set the device as uninterruptible, within a certain time. Refactor the common code into a pair of functions. Suggested-by: Joonas Lahtinen Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Cc: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/1459848145-24042-1-git-send-email-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem_shrinker.c | 79 +++++++++++++----------- 1 file changed, 42 insertions(+), 37 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c index be7501afb59e..39943793edcc 100644 --- a/drivers/gpu/drm/i915/i915_gem_shrinker.c +++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c @@ -289,35 +289,56 @@ i915_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) return freed; } +struct shrinker_lock_uninterruptible { + bool was_interruptible; + bool unlock; +}; + +static bool +i915_gem_shrinker_lock_uninterruptible(struct drm_i915_private *dev_priv, + struct shrinker_lock_uninterruptible *slu, + int timeout_ms) +{ + unsigned long timeout = msecs_to_jiffies(timeout_ms) + 1; + + while (!i915_gem_shrinker_lock(dev_priv->dev, &slu->unlock)) { + schedule_timeout_killable(1); + if (fatal_signal_pending(current)) + return false; + if (--timeout == 0) { + pr_err("Unable to lock GPU to purge memory.\n"); + return false; + } + } + + slu->was_interruptible = dev_priv->mm.interruptible; + dev_priv->mm.interruptible = false; + return true; +} + +static void +i915_gem_shrinker_unlock_uninterruptible(struct drm_i915_private *dev_priv, + struct shrinker_lock_uninterruptible *slu) +{ + dev_priv->mm.interruptible = slu->was_interruptible; + if (slu->unlock) + mutex_unlock(&dev_priv->dev->struct_mutex); +} + static int i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr) { struct drm_i915_private *dev_priv = container_of(nb, struct drm_i915_private, mm.oom_notifier); - struct drm_device *dev = dev_priv->dev; + struct shrinker_lock_uninterruptible slu; struct drm_i915_gem_object *obj; - unsigned long timeout = msecs_to_jiffies(5000) + 1; unsigned long pinned, bound, unbound, 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 memory due lock contention.\n"); + if (!i915_gem_shrinker_lock_uninterruptible(dev_priv, &slu, 5000)) 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; - /* Because we may be allocating inside our own driver, we cannot * assert that there are no objects with pinned pages that are not * being pointed to by hardware. @@ -342,8 +363,7 @@ i915_gem_shrinker_oom(struct notifier_block *nb, unsigned long event, void *ptr) bound += obj->base.size; } - if (unlock) - mutex_unlock(&dev->struct_mutex); + i915_gem_shrinker_unlock_uninterruptible(dev_priv, &slu); if (freed_pages || unbound || bound) pr_info("Purging GPU memory, %lu bytes freed, %lu bytes still pinned.\n", @@ -362,30 +382,15 @@ 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; + struct shrinker_lock_uninterruptible slu; 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"); + if (!i915_gem_shrinker_lock_uninterruptible(dev_priv, &slu, 5000)) 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); + i915_gem_shrinker_unlock_uninterruptible(dev_priv, &slu); *(unsigned long *)ptr += freed_pages; return NOTIFY_DONE; -- 2.20.1