IB/core: Add flags for on demand paging support

* Add a configuration option for enable on-demand paging support in
  the infiniband subsystem (CONFIG_INFINIBAND_ON_DEMAND_PAGING). In a
  later patch, this configuration option will select the MMU_NOTIFIER
  configuration option to enable mmu notifiers.
* Add a flag for on demand paging (ODP) support in the IB device capabilities.
* Add a flag to request ODP MR in the access flags to reg_mr.
* Fail registrations done with the ODP flag when the low-level driver
  doesn't support this.
* Change the conditions in which an MR will be writable to explicitly
  specify the access flags.  This is to avoid making an MR writable just
  because it is an ODP MR.
* Add a ODP capabilities to the extended query device verb.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/uapi/rdma/ib_user_verbs.h b/include/uapi/rdma/ib_user_verbs.h
index e8a96071e352..4275b961bf60 100644
--- a/include/uapi/rdma/ib_user_verbs.h
+++ b/include/uapi/rdma/ib_user_verbs.h
@@ -202,15 +202,30 @@ struct ib_uverbs_query_device_resp {
         __u8  reserved[4];
 };
 
+enum {
+        IB_USER_VERBS_EX_QUERY_DEVICE_ODP =             1ULL << 0,
+};
+
 struct ib_uverbs_ex_query_device {
         __u32 comp_mask;
         __u32 reserved;
 };
 
+struct ib_uverbs_odp_caps {
+        __u64 general_caps;
+        struct {
+                __u32 rc_odp_caps;
+                __u32 uc_odp_caps;
+                __u32 ud_odp_caps;
+        } per_transport_caps;
+        __u32 reserved;
+};
+
 struct ib_uverbs_ex_query_device_resp {
         struct ib_uverbs_query_device_resp base;
         __u32 comp_mask;
         __u32 reserved;
+        struct ib_uverbs_odp_caps odp_caps;
 };
 
 struct ib_uverbs_query_port {