IB/ehca: Tolerate dynamic memory operations before driver load

Implement toleration of dynamic memory operations and 16 GB gigantic
pages, where "toleration" means that the driver can cope with dynamic
memory operations that happen before the driver is loaded.  While the
ehca driver is loaded, dynamic memory operations are still prohibited
by returning NOTIFY_BAD from the memory notifier.

On module load the driver walks through available system memory,
checks for available memory ranges and then registers the kernel
internal memory region accordingly.  The translation of address ranges
is implemented via a 3-level busmap.

Signed-off-by: Hannes Hering <hering2@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.h b/drivers/infiniband/hw/ehca/ehca_mrmw.h
index bc8f4e31c123..50d8b51306dd 100644
--- a/drivers/infiniband/hw/ehca/ehca_mrmw.h
+++ b/drivers/infiniband/hw/ehca/ehca_mrmw.h
@@ -42,6 +42,11 @@
 #ifndef _EHCA_MRMW_H_
 #define _EHCA_MRMW_H_
 
+enum ehca_reg_type {
+        EHCA_REG_MR,
+        EHCA_REG_BUSMAP_MR
+};
+
 int ehca_reg_mr(struct ehca_shca *shca,
                 struct ehca_mr *e_mr,
                 u64 *iova_start,
@@ -50,7 +55,8 @@ int ehca_reg_mr(struct ehca_shca *shca,
                 struct ehca_pd *e_pd,
                 struct ehca_mr_pginfo *pginfo,
                 u32 *lkey,
-                u32 *rkey);
+                u32 *rkey,
+                enum ehca_reg_type reg_type);
 
 int ehca_reg_mr_rpages(struct ehca_shca *shca,
                        struct ehca_mr *e_mr,
@@ -118,4 +124,9 @@ void ehca_mrmw_reverse_map_acl(const u32 *hipz_acl,
 
 void ehca_mr_deletenew(struct ehca_mr *mr);
 
+int ehca_create_busmap(void);
+
+void ehca_destroy_busmap(void);
+
+extern struct ib_dma_mapping_ops ehca_dma_mapping_ops;
 #endif  /*_EHCA_MRMW_H_*/