[PATCH v13 01/13] iova: Export alloc_iova_fast() and free_iova_fast()

Xie Yongji
2021-08-31T10:37:38Z

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>
---
drivers/iommu/iova.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index b6cf5f16123b..3941ed6bb99b 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -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)
--
2.11.0