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drm/i915/userptr: Store i915 backpointer for i915_mm_struct

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Since we only ever use the drm_i915_private from the stored
i915_mm_struct->dev, save some electrons by storing the right
backpointer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1459864801-28606-3-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-04-05 15:00:01 +01:00
parent 40313f0cd0
commit f470b19095
1 changed files with 5 additions and 5 deletions
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10
drivers/gpu/drm/i915/i915_gem_userptr.c
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@ -34,7 +34,7 @@
struct i915_mm_struct {
struct mm_struct *mm;
struct drm_device *dev;
struct drm_i915_private *i915;
struct i915_mmu_notifier *mn;
struct hlist_node node;
struct kref kref;
@ -250,13 +250,13 @@ i915_mmu_notifier_find(struct i915_mm_struct *mm)
return mn;
down_write(&mm->mm->mmap_sem);
mutex_lock(&to_i915(mm->dev)->mm_lock);
mutex_lock(&mm->i915->mm_lock);
if ((mn = mm->mn) == NULL) {
mn = i915_mmu_notifier_create(mm->mm);
if (!IS_ERR(mn))
mm->mn = mn;
}
mutex_unlock(&to_i915(mm->dev)->mm_lock);
mutex_unlock(&mm->i915->mm_lock);
up_write(&mm->mm->mmap_sem);
return mn;
@ -373,7 +373,7 @@ i915_gem_userptr_init__mm_struct(struct drm_i915_gem_object *obj)
}
kref_init(&mm->kref);
mm->dev = obj->base.dev;
mm->i915 = to_i915(obj->base.dev);
mm->mm = current->mm;
atomic_inc(&current->mm->mm_count);
@ -408,7 +408,7 @@ __i915_mm_struct_free(struct kref *kref)
/* Protected by dev_priv->mm_lock */
hash_del(&mm->node);
mutex_unlock(&to_i915(mm->dev)->mm_lock);
mutex_unlock(&mm->i915->mm_lock);
INIT_WORK(&mm->work, __i915_mm_struct_free__worker);
schedule_work(&mm->work);