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iommu/iova: Put free_iova_mem() outside of spinlock iova_rbtree_lock

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It is not necessary to put free_iova_mem() inside of spinlock/unlock
iova_rbtree_lock which only leads to more completion for the spinlock.
It has a small promote on the performance after the change. And also
rename private_free_iova() as remove_iova() because the function will not
free iova after that change.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/1620647582-194621-1-git-send-email-chenxiang66@hisilicon.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Xiang Chen 2021-05-10 19:53:02 +08:00 committed by Joerg Roedel
parent 571f316074
commit 7978724f39
1 changed files with 11 additions and 7 deletions
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18
drivers/iommu/iova.c
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@ -412,12 +412,11 @@ private_find_iova(struct iova_domain *iovad, unsigned long pfn)
return NULL;
}
static void private_free_iova(struct iova_domain *iovad, struct iova *iova)
static void remove_iova(struct iova_domain *iovad, struct iova *iova)
{
assert_spin_locked(&iovad->iova_rbtree_lock);
__cached_rbnode_delete_update(iovad, iova);
rb_erase(&iova->node, &iovad->rbroot);
free_iova_mem(iova);
}
/**
@ -452,8 +451,9 @@ __free_iova(struct iova_domain *iovad, struct iova *iova)
unsigned long flags;
spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
private_free_iova(iovad, iova);
remove_iova(iovad, iova);
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
free_iova_mem(iova);
}
EXPORT_SYMBOL_GPL(__free_iova);
@ -472,10 +472,13 @@ free_iova(struct iova_domain *iovad, unsigned long pfn)
spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
iova = private_find_iova(iovad, pfn);
if (iova)
private_free_iova(iovad, iova);
if (!iova) {
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
return;
}
remove_iova(iovad, iova);
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);
free_iova_mem(iova);
}
EXPORT_SYMBOL_GPL(free_iova);
@ -825,7 +828,8 @@ iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
if (WARN_ON(!iova))
continue;
private_free_iova(iovad, iova);
remove_iova(iovad, iova);
free_iova_mem(iova);
}
spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags);