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iova: Export alloc_iova_fast() and free_iova_fast()
Export alloc_iova_fast() and free_iova_fast() so that some modules can make use of the per-CPU cache to get rid of rbtree spinlock in alloc_iova() and free_iova() during IOVA allocation. Signed-off-by: Xie Yongji <xieyongji@bytedance.com> Acked-by: Jason Wang <jasowang@redhat.com> Acked-by: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20210831103634.33-2-xieyongji@bytedance.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -521,6 +521,7 @@ retry:
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return new_iova->pfn_lo;
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}
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EXPORT_SYMBOL_GPL(alloc_iova_fast);
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/**
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* free_iova_fast - free iova pfn range into rcache
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@ -538,6 +539,7 @@ free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size)
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free_iova(iovad, pfn);
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}
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EXPORT_SYMBOL_GPL(free_iova_fast);
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#define fq_ring_for_each(i, fq) \
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for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE)
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