Commit a93a9626 authored by Xie Yongji's avatar Xie Yongji Committed by Michael S. Tsirkin
Browse files

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: default avatarXie Yongji <xieyongji@bytedance.com>
Acked-by: default avatarJason Wang <jasowang@redhat.com>
Acked-by: default avatarWill Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210831103634.33-2-xieyongji@bytedance.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 6105d1fe

drivers/iommu/iova.c

+2 −0
Original line number Diff line number Diff line
@@ -521,6 +521,7 @@ alloc_iova_fast(struct iova_domain *iovad, unsigned long size, 


	return new_iova->pfn_lo;

}

EXPORT_SYMBOL_GPL(alloc_iova_fast);



/**

 * free_iova_fast - free iova pfn range into rcache
@@ -538,6 +539,7 @@ free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size) 


	free_iova(iovad, pfn);

}

EXPORT_SYMBOL_GPL(free_iova_fast);



#define fq_ring_for_each(i, fq) \

	for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE)