diff --git a/drivers/infiniband/sw/siw/siw_obj.c b/drivers/infiniband/sw/siw/siw_obj.c
new file mode 100644
index 000000000000..3772df09dbf2
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_obj.c
@@ -0,0 +1,291 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#include <linux/spinlock.h>
+#include <linux/kref.h>
+#include <linux/vmalloc.h>
+
+#include "siw.h"
+#include "siw_obj.h"
+#include "siw_cm.h"
+
+void siw_objhdr_init(struct siw_objhdr *hdr)
+{
+	kref_init(&hdr->ref);
+}
+
+void siw_idr_release(struct siw_device *sdev)
+{
+	idr_destroy(&sdev->qp_idr);
+	idr_destroy(&sdev->cq_idr);
+	idr_destroy(&sdev->pd_idr);
+	idr_destroy(&sdev->mem_idr);
+}
+
+static int siw_add_obj(spinlock_t *lock, struct idr *idr,
+		       struct siw_objhdr *obj)
+{
+	unsigned long flags;
+	int id, min_id;
+
+	get_random_bytes(&min_id, 4);
+	min_id &= 0x00FFFFFF;
+again:
+	spin_lock_irqsave(lock, flags);
+	id = idr_alloc(idr, obj, min_id, 0x00FFFFFF - 1, GFP_KERNEL);
+	spin_unlock_irqrestore(lock, flags);
+
+	if (id > 0) {
+		siw_objhdr_init(obj);
+		obj->id = id;
+	} else if (id == -ENOSPC && min_id != 1) {
+		min_id = 1;
+		goto again;
+	} else {
+		pr_warn("siw: object ID space\n");
+	}
+	if (id > 0)
+		return 0;
+
+	return id == 0 ? -ENOSPC : id;
+}
+
+int siw_qp_add(struct siw_device *sdev, struct siw_qp *qp)
+{
+	int rv = siw_add_obj(&sdev->lock, &sdev->qp_idr, &qp->hdr);
+
+	if (!rv) {
+		qp->hdr.sdev = sdev;
+		siw_dbg_obj(qp, "new QP\n");
+	}
+	return rv;
+}
+
+int siw_cq_add(struct siw_device *sdev, struct siw_cq *cq)
+{
+	int rv = siw_add_obj(&sdev->lock, &sdev->cq_idr, &cq->hdr);
+
+	if (!rv) {
+		cq->hdr.sdev = sdev;
+		siw_dbg_obj(cq, "new CQ\n");
+	}
+	return rv;
+}
+
+int siw_pd_add(struct siw_device *sdev, struct siw_pd *pd)
+{
+	int rv = siw_add_obj(&sdev->lock, &sdev->pd_idr, &pd->hdr);
+
+	if (!rv) {
+		pd->hdr.sdev = sdev;
+		siw_dbg_obj(pd, "new PD\n");
+	}
+	return rv;
+}
+
+/*
+ * Stag lookup is based on its index part only (24 bits).
+ * The code avoids special Stag of zero and tries to randomize
+ * STag values between 1 and SIW_STAG_MAX_INDEX.
+ */
+int siw_mem_add(struct siw_device *sdev, struct siw_mem *m)
+{
+	unsigned long flags;
+	int id, min_id, max_id = 0x00FFFFFF;
+
+	do {
+		get_random_bytes(&min_id, 4);
+		min_id &= 0x00FFFFFF;
+	} while (min_id <= 0);
+again:
+	spin_lock_irqsave(&sdev->lock, flags);
+	id = idr_alloc(&sdev->mem_idr, m, min_id, max_id, GFP_KERNEL);
+	spin_unlock_irqrestore(&sdev->lock, flags);
+
+	if (id == -ENOMEM)
+		return -ENOMEM;
+
+	if (id == -ENOSPC) {
+		max_id = min_id;
+		min_id /= 2;
+		if (min_id <= 0) {
+			pr_warn("siw: memory ID space\n");
+			return -ENOSPC;
+		}
+		goto again;
+	}
+	siw_objhdr_init(&m->hdr);
+	m->hdr.id = id;
+	m->hdr.sdev = sdev;
+
+	siw_dbg_obj(m, "new MEM object\n");
+
+	return 0;
+}
+
+void siw_remove_obj(spinlock_t *lock, struct idr *idr, struct siw_objhdr *hdr)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(lock, flags);
+	idr_remove(idr, hdr->id);
+	spin_unlock_irqrestore(lock, flags);
+}
+
+/********** routines to put objs back and free if no ref left *****/
+
+void siw_free_cq(struct kref *ref)
+{
+	struct siw_cq *cq = (container_of(
+		container_of(ref, struct siw_objhdr, ref), struct siw_cq, hdr));
+
+	siw_dbg_obj(cq, "free cq\n");
+
+	atomic_dec(&cq->hdr.sdev->num_cq);
+	if (cq->queue)
+		vfree(cq->queue);
+	kfree(cq);
+}
+
+void siw_free_qp(struct kref *ref)
+{
+	struct siw_qp *qp = container_of(
+		container_of(ref, struct siw_objhdr, ref), struct siw_qp, hdr);
+	struct siw_device *sdev = qp->hdr.sdev;
+	unsigned long flags;
+
+	siw_dbg_obj(qp, "free qp\n");
+
+	if (qp->cep)
+		siw_cep_put(qp->cep);
+
+	siw_remove_obj(&sdev->lock, &sdev->qp_idr, &qp->hdr);
+
+	spin_lock_irqsave(&sdev->lock, flags);
+	list_del(&qp->devq);
+	spin_unlock_irqrestore(&sdev->lock, flags);
+
+	if (qp->sendq)
+		vfree(qp->sendq);
+	if (qp->recvq)
+		vfree(qp->recvq);
+	if (qp->irq)
+		vfree(qp->irq);
+	if (qp->orq)
+		vfree(qp->orq);
+
+	siw_put_tx_cpu(qp->tx_cpu);
+
+	atomic_dec(&sdev->num_qp);
+	kfree(qp);
+}
+
+void siw_free_pd(struct kref *ref)
+{
+	struct siw_pd *pd = container_of(
+		container_of(ref, struct siw_objhdr, ref), struct siw_pd, hdr);
+
+	siw_dbg_obj(pd, "free PD\n");
+
+	atomic_dec(&pd->hdr.sdev->num_pd);
+}
+
+void siw_free_mem(struct kref *ref)
+{
+	struct siw_mem *m;
+	struct siw_device *sdev;
+
+	m = container_of(container_of(ref, struct siw_objhdr, ref),
+			 struct siw_mem, hdr);
+	sdev = m->hdr.sdev;
+
+	siw_dbg_obj(m, "free mem\n");
+
+	atomic_dec(&sdev->num_mr);
+
+	if (SIW_MEM_IS_MW(m)) {
+		struct siw_mw *mw = container_of(m, struct siw_mw, mem);
+
+		kfree_rcu(mw, rcu);
+	} else {
+		struct siw_mr *mr = container_of(m, struct siw_mr, mem);
+		unsigned long flags;
+
+		siw_dbg(m->hdr.sdev, "[MEM %d]: has pbl: %s\n", OBJ_ID(m),
+			mr->mem.is_pbl ? "y" : "n");
+
+		if (mr->pd)
+			siw_pd_put(mr->pd);
+
+		if (mr->mem_obj) {
+			if (mr->mem.is_pbl == 0)
+				siw_umem_release(mr->umem, true);
+			else
+				siw_pbl_free(mr->pbl);
+		}
+		spin_lock_irqsave(&sdev->lock, flags);
+		list_del(&mr->devq);
+		spin_unlock_irqrestore(&sdev->lock, flags);
+
+		kfree_rcu(mr, rcu);
+	}
+}
+
+void siw_wqe_put_mem(struct siw_wqe *wqe, enum siw_opcode op)
+{
+	switch (op) {
+	case SIW_OP_SEND:
+	case SIW_OP_WRITE:
+	case SIW_OP_SEND_WITH_IMM:
+	case SIW_OP_SEND_REMOTE_INV:
+	case SIW_OP_READ:
+	case SIW_OP_READ_LOCAL_INV:
+		if (!(wqe->sqe.flags & SIW_WQE_INLINE))
+			siw_unref_mem_sgl(wqe->mem, wqe->sqe.num_sge);
+		break;
+
+	case SIW_OP_RECEIVE:
+		siw_unref_mem_sgl(wqe->mem, wqe->rqe.num_sge);
+		break;
+
+	case SIW_OP_READ_RESPONSE:
+		siw_unref_mem_sgl(wqe->mem, 1);
+		break;
+
+	default:
+		/*
+		 * SIW_OP_INVAL_STAG and SIW_OP_REG_MR
+		 * do not hold memory references
+		 */
+		break;
+	}
+}
+
+int siw_invalidate_stag(struct siw_pd *pd, u32 stag)
+{
+	u32 stag_idx = stag >> 8;
+	struct siw_mem *mem = siw_mem_id2obj(pd->hdr.sdev, stag_idx);
+	int rv = 0;
+
+	if (unlikely(!mem)) {
+		siw_dbg(pd->hdr.sdev, "stag %u unknown\n", stag_idx);
+		return -EINVAL;
+	}
+	if (unlikely(siw_mem2mr(mem)->pd != pd)) {
+		siw_dbg(pd->hdr.sdev, "pd mismatch for stag %u\n", stag_idx);
+		rv = -EACCES;
+		goto out;
+	}
+	/*
+	 * Per RDMA verbs definition, an STag may already be in invalid
+	 * state if invalidation is requested. So no state check here.
+	 */
+	mem->stag_valid = 0;
+
+	siw_dbg(pd->hdr.sdev, "stag %u now valid\n", stag_idx);
+out:
+	siw_mem_put(mem);
+	return rv;
+}
diff --git a/drivers/infiniband/sw/siw/siw_obj.h b/drivers/infiniband/sw/siw/siw_obj.h
new file mode 100644
index 000000000000..a5722cb6d885
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_obj.h
@@ -0,0 +1,201 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#ifndef _SIW_OBJ_H
+#define _SIW_OBJ_H
+
+#include <linux/idr.h>
+#include <linux/rwsem.h>
+#include <linux/version.h>
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+
+#include <rdma/ib_verbs.h>
+
+#include "siw_debug.h"
+
+extern void siw_free_qp(struct kref *ref);
+extern void siw_free_pd(struct kref *ref);
+extern void siw_free_cq(struct kref *ref);
+extern void siw_free_mem(struct kref *ref);
+
+static inline struct siw_ucontext *to_siw_ctx(struct ib_ucontext *base_ctx)
+{
+	return container_of(base_ctx, struct siw_ucontext, base_ucontext);
+}
+
+static inline struct siw_qp *to_siw_qp(struct ib_qp *base_qp)
+{
+	return container_of(base_qp, struct siw_qp, base_qp);
+}
+
+static inline struct siw_cq *to_siw_cq(struct ib_cq *base_cq)
+{
+	return container_of(base_cq, struct siw_cq, base_cq);
+}
+
+static inline struct siw_srq *to_siw_srq(struct ib_srq *base_srq)
+{
+	return container_of(base_srq, struct siw_srq, base_srq);
+}
+
+static inline struct siw_device *to_siw_dev(struct ib_device *base_dev)
+{
+	return container_of(base_dev, struct siw_device, base_dev);
+}
+
+static inline struct siw_mr *to_siw_mr(struct ib_mr *base_mr)
+{
+	return container_of(base_mr, struct siw_mr, base_mr);
+}
+
+static inline struct siw_pd *to_siw_pd(struct ib_pd *base_pd)
+{
+	return container_of(base_pd, struct siw_pd, base_pd);
+}
+
+static inline void siw_cq_get(struct siw_cq *cq)
+{
+	kref_get(&cq->hdr.ref);
+	siw_dbg_obj(cq, "new refcount: %d\n", kref_read(&cq->hdr.ref));
+}
+static inline void siw_qp_get(struct siw_qp *qp)
+{
+	kref_get(&qp->hdr.ref);
+	siw_dbg_obj(qp, "new refcount: %d\n", kref_read(&qp->hdr.ref));
+}
+
+static inline void siw_pd_get(struct siw_pd *pd)
+{
+	kref_get(&pd->hdr.ref);
+	siw_dbg_obj(pd, "new refcount: %d\n", kref_read(&pd->hdr.ref));
+}
+
+static inline void siw_mem_get(struct siw_mem *mem)
+{
+	kref_get(&mem->hdr.ref);
+	siw_dbg_obj(mem, "new refcount: %d\n", kref_read(&mem->hdr.ref));
+}
+
+static inline void siw_mem_put(struct siw_mem *mem)
+{
+	siw_dbg_obj(mem, "old refcount: %d\n", kref_read(&mem->hdr.ref));
+	kref_put(&mem->hdr.ref, siw_free_mem);
+}
+
+static inline void siw_unref_mem_sgl(struct siw_mem **mem, unsigned int num_sge)
+{
+	while (num_sge) {
+		if (*mem == NULL)
+			break;
+
+		siw_mem_put(*mem);
+		*mem = NULL;
+		mem++;
+		num_sge--;
+	}
+}
+
+static inline struct siw_objhdr *siw_get_obj(struct idr *idr, int id)
+{
+	struct siw_objhdr *obj = idr_find(idr, id);
+
+	if (likely(obj && kref_get_unless_zero(&obj->ref)))
+		return obj;
+
+	return NULL;
+}
+
+static inline struct siw_objhdr *siw_get_obj_rcu(struct idr *idr, int id)
+{
+	struct siw_objhdr *obj;
+
+	rcu_read_lock();
+	obj = idr_find(idr, id);
+	rcu_read_unlock();
+
+	if (likely(obj && kref_get_unless_zero(&obj->ref)))
+		return obj;
+
+	return NULL;
+}
+
+static inline struct siw_cq *siw_cq_id2obj(struct siw_device *sdev, int id)
+{
+	struct siw_objhdr *obj = siw_get_obj(&sdev->cq_idr, id);
+
+	if (obj)
+		return container_of(obj, struct siw_cq, hdr);
+
+	return NULL;
+}
+
+static inline struct siw_qp *siw_qp_id2obj(struct siw_device *sdev, int id)
+{
+	struct siw_objhdr *obj = siw_get_obj(&sdev->qp_idr, id);
+
+	if (obj)
+		return container_of(obj, struct siw_qp, hdr);
+
+	return NULL;
+}
+
+static inline void siw_cq_put(struct siw_cq *cq)
+{
+	siw_dbg_obj(cq, "old refcount: %d\n", kref_read(&cq->hdr.ref));
+	kref_put(&cq->hdr.ref, siw_free_cq);
+}
+
+static inline void siw_qp_put(struct siw_qp *qp)
+{
+	siw_dbg_obj(qp, "old refcount: %d\n", kref_read(&qp->hdr.ref));
+	kref_put(&qp->hdr.ref, siw_free_qp);
+}
+
+static inline void siw_pd_put(struct siw_pd *pd)
+{
+	siw_dbg_obj(pd, "old refcount: %d\n", kref_read(&pd->hdr.ref));
+	kref_put(&pd->hdr.ref, siw_free_pd);
+}
+
+/*
+ * siw_mem_id2obj()
+ *
+ * resolves memory from stag given by id. might be called from:
+ * o process context before sending out of sgl, or
+ * o in softirq when resolving target memory
+ */
+static inline struct siw_mem *siw_mem_id2obj(struct siw_device *sdev, int id)
+{
+	struct siw_objhdr *obj = siw_get_obj_rcu(&sdev->mem_idr, id);
+
+	if (likely(obj)) {
+		struct siw_mem *mem = container_of(obj, struct siw_mem, hdr);
+
+		siw_dbg_obj(mem, "new refcount: %d\n", kref_read(&obj->ref));
+		return mem;
+	}
+	return NULL;
+}
+
+extern void siw_remove_obj(spinlock_t *lock, struct idr *idr,
+			   struct siw_objhdr *hdr);
+
+extern void siw_objhdr_init(struct siw_objhdr *hdr);
+extern void siw_idr_release(struct siw_device *dev);
+
+extern struct siw_cq *siw_cq_id2obj(struct siw_device *dev, int id);
+extern struct siw_qp *siw_qp_id2obj(struct siw_device *dev, int id);
+extern struct siw_mem *siw_mem_id2obj(struct siw_device *dev, int id);
+
+extern int siw_qp_add(struct siw_device *dev, struct siw_qp *qp);
+extern int siw_cq_add(struct siw_device *dev, struct siw_cq *cq);
+extern int siw_pd_add(struct siw_device *dev, struct siw_pd *pd);
+extern int siw_mem_add(struct siw_device *dev, struct siw_mem *mem);
+
+extern struct siw_wqe *siw_freeq_wqe_get(struct siw_qp *qp);
+
+extern int siw_invalidate_stag(struct siw_pd *pd, u32 stag);
+#endif
