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| author | Robin Murphy <robin.murphy@arm.com> | 2017-09-21 16:52:46 +0100 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-09-27 17:09:57 +0200 |
| commit | bb68b2fbfbd643d4407541f9c7a16a2c9b3a57c7 (patch) | |
| tree | 5661f027cb017af913c04f8f4d3f1178c18a7264 /include/linux/iova.h | |
| parent | aa3ac9469c1850ed00741955b975c3a19029763a (diff) | |
| download | linux-0-day-bb68b2fbfbd643d4407541f9c7a16a2c9b3a57c7.tar.gz linux-0-day-bb68b2fbfbd643d4407541f9c7a16a2c9b3a57c7.tar.xz | |
iommu/iova: Add rbtree anchor node
Add a permanent dummy IOVA reservation to the rbtree, such that we can
always access the top of the address space instantly. The immediate
benefit is that we remove the overhead of the rb_last() traversal when
not using the cached node, but it also paves the way for further
simplifications.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iova.h')
| -rw-r--r-- | include/linux/iova.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/iova.h b/include/linux/iova.h index 953cfd20f1520..c696ee81054ed 100644 --- a/include/linux/iova.h +++ b/include/linux/iova.h @@ -75,6 +75,7 @@ struct iova_domain { unsigned long granule; /* pfn granularity for this domain */ unsigned long start_pfn; /* Lower limit for this domain */ unsigned long dma_32bit_pfn; + struct iova anchor; /* rbtree lookup anchor */ struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */ iova_flush_cb flush_cb; /* Call-Back function to flush IOMMU |