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RDMA/odp: Use the common interval tree library instead of generic

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ODP is working with userspace VA's in the interval tree which always fit
into an unsigned long, so we can use the common code.

This comes at a cost of a 16 byte increase in ib_umem_odp struct size due
to storing the interval tree start/last in addition to the umem
addr/length. However these values were computed and are performance
critical for the interval lookup, so this seems like a worthwhile trade
off.

Removes 2k of .text from the kernel.

Link: https://lore.kernel.org/r/20190819111710.18440-2-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2019-08-19 14:16:59 +03:00
parent 27b7fb1ab7
commit 7cc2e18f21
3 changed files with 31 additions and 62 deletions
Download patch file Download diff file Expand all files Collapse all files

20
include/rdma/ib_umem_odp.h
View file

@ -37,11 +37,6 @@
#include <rdma/ib_verbs.h>
#include <linux/interval_tree.h>
struct umem_odp_node {
u64 __subtree_last;
struct rb_node rb;
};
struct ib_umem_odp {
struct ib_umem umem;
struct ib_ucontext_per_mm *per_mm;
@ -72,7 +67,7 @@ struct ib_umem_odp {
int npages;
/* Tree tracking */
struct umem_odp_node interval_tree;
struct interval_tree_node interval_tree;
struct completion notifier_completion;
int dying;
@ -163,8 +158,17 @@ int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root,
* Find first region intersecting with address range.
* Return NULL if not found
*/
struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root_cached *root,
u64 addr, u64 length);
static inline struct ib_umem_odp *
rbt_ib_umem_lookup(struct rb_root_cached *root, u64 addr, u64 length)
{
struct interval_tree_node *node;
node = interval_tree_iter_first(root, addr, addr + length - 1);
if (!node)
return NULL;
return container_of(node, struct ib_umem_odp, interval_tree);
}
static inline int ib_umem_mmu_notifier_retry(struct ib_umem_odp *umem_odp,
unsigned long mmu_seq)