RDMA/restrack: Track ucontext

Add ability to track allocated ib_ucontext, which are limited
resource and worth to be visible by users.
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/restrack.c

@@ -32,6 +32,7 @@ static const char *type2str(enum rdma_restrack_type type)
 		[RDMA_RESTRACK_QP] = "QP",
 		[RDMA_RESTRACK_CM_ID] = "CM_ID",
 		[RDMA_RESTRACK_MR] = "MR",
+		[RDMA_RESTRACK_CTX] = "CTX",
 	};
 
 	return names[type];
@@ -130,6 +131,8 @@ static struct ib_device *res_to_dev(struct rdma_restrack_entry *res)
 				    res)->id.device;
 	case RDMA_RESTRACK_MR:
 		return container_of(res, struct ib_mr, res)->device;
+	case RDMA_RESTRACK_CTX:
+		return container_of(res, struct ib_ucontext, res)->device;
 	default:
 		WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
 		return NULL;
@@ -149,6 +152,8 @@ static bool res_is_user(struct rdma_restrack_entry *res)
 		return !res->kern_name;
 	case RDMA_RESTRACK_MR:
 		return container_of(res, struct ib_mr, res)->pd->uobject;
+	case RDMA_RESTRACK_CTX:
+		return true;
 	default:
 		WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
 		return false;

include/rdma/ib_verbs.h

@@ -1505,6 +1505,10 @@ struct ib_ucontext {
 #endif
 
 	struct ib_rdmacg_object	cg_obj;
+	/*
+	 * Implementation details of the RDMA core, don't use in drivers:
+	 */
+	struct rdma_restrack_entry res;
 };
 
 struct ib_uobject {

include/rdma/restrack.h

@@ -38,6 +38,10 @@ enum rdma_restrack_type {
 	 * @RDMA_RESTRACK_MR: Memory Region (MR)
 	 */
 	RDMA_RESTRACK_MR,
+	/**
+	 * @RDMA_RESTRACK_CTX: Verbs contexts (CTX)
+	 */
+	RDMA_RESTRACK_CTX,
 	/**
 	 * @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
 	 */