IB/core: Change idr objects to use the new schema

This changes only the handlers which deals with idr based objects to
use the new idr allocation, fetching and destruction schema.
This patch consists of the following changes:
(1) Allocation, fetching and destruction is done via idr ops.
(2) Context initializing and release is done through
    uverbs_initialize_ucontext and uverbs_cleanup_ucontext.
(3) Ditching the live flag. Mostly, this is pretty straight
    forward. The only place that is a bit trickier is in
    ib_uverbs_open_qp. Commit [1] added code to check whether
    the uobject is already live and initialized. This mostly
    happens because of a race between open_qp and events.
    We delayed assigning the uobject's pointer in order to
    eliminate this race without using the live variable.

[1] commit a040f95dc819
	("IB/core: Fix XRC race condition in ib_uverbs_open_qp")

Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 317 insertions, 994 deletions

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 79de69dc9f1c..2f258aaec7b9 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -40,269 +40,13 @@
 
 #include <linux/uaccess.h>
 
+#include <rdma/uverbs_types.h>
+#include <rdma/uverbs_std_types.h>
+#include "rdma_core.h"
+
 #include "uverbs.h"
 #include "core_priv.h"
 
-struct uverbs_lock_class {
-	struct lock_class_key	key;
-	char			name[16];
-};
-
-static struct uverbs_lock_class pd_lock_class	= { .name = "PD-uobj" };
-static struct uverbs_lock_class mr_lock_class	= { .name = "MR-uobj" };
-static struct uverbs_lock_class mw_lock_class	= { .name = "MW-uobj" };
-static struct uverbs_lock_class cq_lock_class	= { .name = "CQ-uobj" };
-static struct uverbs_lock_class qp_lock_class	= { .name = "QP-uobj" };
-static struct uverbs_lock_class ah_lock_class	= { .name = "AH-uobj" };
-static struct uverbs_lock_class srq_lock_class	= { .name = "SRQ-uobj" };
-static struct uverbs_lock_class xrcd_lock_class = { .name = "XRCD-uobj" };
-static struct uverbs_lock_class rule_lock_class = { .name = "RULE-uobj" };
-static struct uverbs_lock_class wq_lock_class = { .name = "WQ-uobj" };
-static struct uverbs_lock_class rwq_ind_table_lock_class = { .name = "IND_TBL-uobj" };
-
-/*
- * The ib_uobject locking scheme is as follows:
- *
- * - ib_uverbs_idr_lock protects the uverbs idrs themselves, so it
- *   needs to be held during all idr write operations.  When an object is
- *   looked up, a reference must be taken on the object's kref before
- *   dropping this lock.  For read operations, the rcu_read_lock()
- *   and rcu_write_lock() but similarly the kref reference is grabbed
- *   before the rcu_read_unlock().
- *
- * - Each object also has an rwsem.  This rwsem must be held for
- *   reading while an operation that uses the object is performed.
- *   For example, while registering an MR, the associated PD's
- *   uobject.mutex must be held for reading.  The rwsem must be held
- *   for writing while initializing or destroying an object.
- *
- * - In addition, each object has a "live" flag.  If this flag is not
- *   set, then lookups of the object will fail even if it is found in
- *   the idr.  This handles a reader that blocks and does not acquire
- *   the rwsem until after the object is destroyed.  The destroy
- *   operation will set the live flag to 0 and then drop the rwsem;
- *   this will allow the reader to acquire the rwsem, see that the
- *   live flag is 0, and then drop the rwsem and its reference to
- *   object.  The underlying storage will not be freed until the last
- *   reference to the object is dropped.
- */
-
-static void init_uobj(struct ib_uobject *uobj, u64 user_handle,
-		      struct ib_ucontext *context, struct uverbs_lock_class *c)
-{
-	uobj->user_handle = user_handle;
-	uobj->context     = context;
-	kref_init(&uobj->ref);
-	init_rwsem(&uobj->mutex);
-	lockdep_set_class_and_name(&uobj->mutex, &c->key, c->name);
-	uobj->live        = 0;
-}
-
-static void release_uobj(struct kref *kref)
-{
-	kfree_rcu(container_of(kref, struct ib_uobject, ref), rcu);
-}
-
-static void put_uobj(struct ib_uobject *uobj)
-{
-	kref_put(&uobj->ref, release_uobj);
-}
-
-static void put_uobj_read(struct ib_uobject *uobj)
-{
-	up_read(&uobj->mutex);
-	put_uobj(uobj);
-}
-
-static void put_uobj_write(struct ib_uobject *uobj)
-{
-	up_write(&uobj->mutex);
-	put_uobj(uobj);
-}
-
-static int idr_add_uobj(struct ib_uobject *uobj)
-{
-	int ret;
-
-	idr_preload(GFP_KERNEL);
-	spin_lock(&uobj->context->ufile->idr_lock);
-
-	ret = idr_alloc(&uobj->context->ufile->idr, uobj, 0, 0, GFP_NOWAIT);
-	if (ret >= 0)
-		uobj->id = ret;
-
-	spin_unlock(&uobj->context->ufile->idr_lock);
-	idr_preload_end();
-
-	return ret < 0 ? ret : 0;
-}
-
-void idr_remove_uobj(struct ib_uobject *uobj)
-{
-	spin_lock(&uobj->context->ufile->idr_lock);
-	idr_remove(&uobj->context->ufile->idr, uobj->id);
-	spin_unlock(&uobj->context->ufile->idr_lock);
-}
-
-static struct ib_uobject *__idr_get_uobj(int id, struct ib_ucontext *context)
-{
-	struct ib_uobject *uobj;
-
-	rcu_read_lock();
-	uobj = idr_find(&context->ufile->idr, id);
-	if (uobj) {
-		if (uobj->context == context)
-			kref_get(&uobj->ref);
-		else
-			uobj = NULL;
-	}
-	rcu_read_unlock();
-
-	return uobj;
-}
-
-static struct ib_uobject *idr_read_uobj(int id, struct ib_ucontext *context,
-					int nested)
-{
-	struct ib_uobject *uobj;
-
-	uobj = __idr_get_uobj(id, context);
-	if (!uobj)
-		return NULL;
-
-	if (nested)
-		down_read_nested(&uobj->mutex, SINGLE_DEPTH_NESTING);
-	else
-		down_read(&uobj->mutex);
-	if (!uobj->live) {
-		put_uobj_read(uobj);
-		return NULL;
-	}
-
-	return uobj;
-}
-
-static struct ib_uobject *idr_write_uobj(int id, struct ib_ucontext *context)
-{
-	struct ib_uobject *uobj;
-
-	uobj = __idr_get_uobj(id, context);
-	if (!uobj)
-		return NULL;
-
-	down_write(&uobj->mutex);
-	if (!uobj->live) {
-		put_uobj_write(uobj);
-		return NULL;
-	}
-
-	return uobj;
-}
-
-static void *idr_read_obj(int id, struct ib_ucontext *context,
-			  int nested)
-{
-	struct ib_uobject *uobj;
-
-	uobj = idr_read_uobj(id, context, nested);
-	return uobj ? uobj->object : NULL;
-}
-
-static struct ib_pd *idr_read_pd(int pd_handle, struct ib_ucontext *context)
-{
-	return idr_read_obj(pd_handle, context, 0);
-}
-
-static void put_pd_read(struct ib_pd *pd)
-{
-	put_uobj_read(pd->uobject);
-}
-
-static struct ib_cq *idr_read_cq(int cq_handle, struct ib_ucontext *context, int nested)
-{
-	return idr_read_obj(cq_handle, context, nested);
-}
-
-static void put_cq_read(struct ib_cq *cq)
-{
-	put_uobj_read(cq->uobject);
-}
-
-static struct ib_ah *idr_read_ah(int ah_handle, struct ib_ucontext *context)
-{
-	return idr_read_obj(ah_handle, context, 0);
-}
-
-static void put_ah_read(struct ib_ah *ah)
-{
-	put_uobj_read(ah->uobject);
-}
-
-static struct ib_qp *idr_read_qp(int qp_handle, struct ib_ucontext *context)
-{
-	return idr_read_obj(qp_handle, context, 0);
-}
-
-static struct ib_wq *idr_read_wq(int wq_handle, struct ib_ucontext *context)
-{
-	return idr_read_obj(wq_handle, context, 0);
-}
-
-static void put_wq_read(struct ib_wq *wq)
-{
-	put_uobj_read(wq->uobject);
-}
-
-static struct ib_rwq_ind_table *idr_read_rwq_indirection_table(int ind_table_handle,
-							       struct ib_ucontext *context)
-{
-	return idr_read_obj(ind_table_handle, context, 0);
-}
-
-static void put_rwq_indirection_table_read(struct ib_rwq_ind_table *ind_table)
-{
-	put_uobj_read(ind_table->uobject);
-}
-
-static struct ib_qp *idr_write_qp(int qp_handle, struct ib_ucontext *context)
-{
-	struct ib_uobject *uobj;
-
-	uobj = idr_write_uobj(qp_handle, context);
-	return uobj ? uobj->object : NULL;
-}
-
-static void put_qp_read(struct ib_qp *qp)
-{
-	put_uobj_read(qp->uobject);
-}
-
-static void put_qp_write(struct ib_qp *qp)
-{
-	put_uobj_write(qp->uobject);
-}
-
-static struct ib_srq *idr_read_srq(int srq_handle, struct ib_ucontext *context)
-{
-	return idr_read_obj(srq_handle, context, 0);
-}
-
-static void put_srq_read(struct ib_srq *srq)
-{
-	put_uobj_read(srq->uobject);
-}
-
-static struct ib_xrcd *idr_read_xrcd(int xrcd_handle, struct ib_ucontext *context,
-				     struct ib_uobject **uobj)
-{
-	*uobj = idr_read_uobj(xrcd_handle, context, 0);
-	return *uobj ? (*uobj)->object : NULL;
-}
-
-static void put_xrcd_read(struct ib_uobject *uobj)
-{
-	put_uobj_read(uobj);
-}
 ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 			      struct ib_device *ib_dev,
 			      const char __user *buf,
@@ -347,17 +91,8 @@ ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file,
 	ucontext->cg_obj = cg_obj;
 	/* ufile is required when some objects are released */
 	ucontext->ufile = file;
-	INIT_LIST_HEAD(&ucontext->pd_list);
-	INIT_LIST_HEAD(&ucontext->mr_list);
-	INIT_LIST_HEAD(&ucontext->mw_list);
-	INIT_LIST_HEAD(&ucontext->cq_list);
-	INIT_LIST_HEAD(&ucontext->qp_list);
-	INIT_LIST_HEAD(&ucontext->srq_list);
-	INIT_LIST_HEAD(&ucontext->ah_list);
-	INIT_LIST_HEAD(&ucontext->wq_list);
-	INIT_LIST_HEAD(&ucontext->rwq_ind_tbl_list);
-	INIT_LIST_HEAD(&ucontext->xrcd_list);
-	INIT_LIST_HEAD(&ucontext->rule_list);
+	uverbs_initialize_ucontext(ucontext);
+
 	rcu_read_lock();
 	ucontext->tgid = get_task_pid(current->group_leader, PIDTYPE_PID);
 	rcu_read_unlock();
@@ -564,19 +299,9 @@ ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 		   (unsigned long) cmd.response + sizeof resp,
 		   in_len - sizeof cmd, out_len - sizeof resp);
 
-	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
-	if (!uobj)
-		return -ENOMEM;
-
-	init_uobj(uobj, 0, file->ucontext, &pd_lock_class);
-	ret = ib_rdmacg_try_charge(&uobj->cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret) {
-		kfree(uobj);
-		return ret;
-	}
-
-	down_write(&uobj->mutex);
+	uobj  = uobj_alloc(uobj_get_type(pd), file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
 	pd = ib_dev->alloc_pd(ib_dev, file->ucontext, &udata);
 	if (IS_ERR(pd)) {
@@ -590,10 +315,6 @@ ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 	atomic_set(&pd->usecnt, 0);
 
 	uobj->object = pd;
-	ret = idr_add_uobj(uobj);
-	if (ret)
-		goto err_idr;
-
 	memset(&resp, 0, sizeof resp);
 	resp.pd_handle = uobj->id;
 
@@ -603,25 +324,15 @@ ssize_t ib_uverbs_alloc_pd(struct ib_uverbs_file *file,
 		goto err_copy;
 	}
 
-	mutex_lock(&file->mutex);
-	list_add_tail(&uobj->list, &file->ucontext->pd_list);
-	mutex_unlock(&file->mutex);
-
-	uobj->live = 1;
-
-	up_write(&uobj->mutex);
+	uobj_alloc_commit(uobj);
 
 	return in_len;
 
 err_copy:
-	idr_remove_uobj(uobj);
-
-err_idr:
 	ib_dealloc_pd(pd);
 
 err:
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-	put_uobj_write(uobj);
+	uobj_alloc_abort(uobj);
 	return ret;
 }
 
@@ -632,45 +343,19 @@ ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 {
 	struct ib_uverbs_dealloc_pd cmd;
 	struct ib_uobject          *uobj;
-	struct ib_pd		   *pd;
 	int                         ret;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj = idr_write_uobj(cmd.pd_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
-	pd = uobj->object;
+	uobj  = uobj_get_write(uobj_get_type(pd), cmd.pd_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	if (atomic_read(&pd->usecnt)) {
-		ret = -EBUSY;
-		goto err_put;
-	}
+	ret = uobj_remove_commit(uobj);
 
-	ret = pd->device->dealloc_pd(uobj->object);
-	WARN_ONCE(ret, "Infiniband HW driver failed dealloc_pd");
-	if (ret)
-		goto err_put;
-
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-
-	uobj->live = 0;
-	put_uobj_write(uobj);
-
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	put_uobj(uobj);
-
-	return in_len;
-
-err_put:
-	put_uobj_write(uobj);
-	return ret;
+	return ret ?: in_len;
 }
 
 struct xrcd_table_entry {
@@ -807,16 +492,13 @@ ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 		}
 	}
 
-	obj = kmalloc(sizeof *obj, GFP_KERNEL);
-	if (!obj) {
-		ret = -ENOMEM;
+	obj  = (struct ib_uxrcd_object *)uobj_alloc(uobj_get_type(xrcd),
+						    file->ucontext);
+	if (IS_ERR(obj)) {
+		ret = PTR_ERR(obj);
 		goto err_tree_mutex_unlock;
 	}
 
-	init_uobj(&obj->uobject, 0, file->ucontext, &xrcd_lock_class);
-
-	down_write(&obj->uobject.mutex);
-
 	if (!xrcd) {
 		xrcd = ib_dev->alloc_xrcd(ib_dev, file->ucontext, &udata);
 		if (IS_ERR(xrcd)) {
@@ -834,10 +516,6 @@ ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 
 	atomic_set(&obj->refcnt, 0);
 	obj->uobject.object = xrcd;
-	ret = idr_add_uobj(&obj->uobject);
-	if (ret)
-		goto err_idr;
-
 	memset(&resp, 0, sizeof resp);
 	resp.xrcd_handle = obj->uobject.id;
 
@@ -846,7 +524,7 @@ ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 			/* create new inode/xrcd table entry */
 			ret = xrcd_table_insert(file->device, inode, xrcd);
 			if (ret)
-				goto err_insert_xrcd;
+				goto err_dealloc_xrcd;
 		}
 		atomic_inc(&xrcd->usecnt);
 	}
@@ -860,12 +538,7 @@ ssize_t ib_uverbs_open_xrcd(struct ib_uverbs_file *file,
 	if (f.file)
 		fdput(f);
 
-	mutex_lock(&file->mutex);
-	list_add_tail(&obj->uobject.list, &file->ucontext->xrcd_list);
-	mutex_unlock(&file->mutex);
-
-	obj->uobject.live = 1;
-	up_write(&obj->uobject.mutex);
+	uobj_alloc_commit(&obj->uobject);
 
 	mutex_unlock(&file->device->xrcd_tree_mutex);
 	return in_len;
@@ -877,14 +550,11 @@ err_copy:
 		atomic_dec(&xrcd->usecnt);
 	}
 
-err_insert_xrcd:
-	idr_remove_uobj(&obj->uobject);
-
-err_idr:
+err_dealloc_xrcd:
 	ib_dealloc_xrcd(xrcd);
 
 err:
-	put_uobj_write(&obj->uobject);
+	uobj_alloc_abort(&obj->uobject);
 
 err_tree_mutex_unlock:
 	if (f.file)
@@ -902,60 +572,20 @@ ssize_t ib_uverbs_close_xrcd(struct ib_uverbs_file *file,
 {
 	struct ib_uverbs_close_xrcd cmd;
 	struct ib_uobject           *uobj;
-	struct ib_xrcd              *xrcd = NULL;
-	struct inode                *inode = NULL;
-	struct ib_uxrcd_object      *obj;
-	int                         live;
 	int                         ret = 0;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	mutex_lock(&file->device->xrcd_tree_mutex);
-	uobj = idr_write_uobj(cmd.xrcd_handle, file->ucontext);
-	if (!uobj) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	xrcd  = uobj->object;
-	inode = xrcd->inode;
-	obj   = container_of(uobj, struct ib_uxrcd_object, uobject);
-	if (atomic_read(&obj->refcnt)) {
-		put_uobj_write(uobj);
-		ret = -EBUSY;
-		goto out;
-	}
-
-	if (!inode || atomic_dec_and_test(&xrcd->usecnt)) {
-		ret = ib_dealloc_xrcd(uobj->object);
-		if (!ret)
-			uobj->live = 0;
+	uobj  = uobj_get_write(uobj_get_type(xrcd), cmd.xrcd_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj)) {
+		mutex_unlock(&file->device->xrcd_tree_mutex);
+		return PTR_ERR(uobj);
 	}
 
-	live = uobj->live;
-	if (inode && ret)
-		atomic_inc(&xrcd->usecnt);
-
-	put_uobj_write(uobj);
-
-	if (ret)
-		goto out;
-
-	if (inode && !live)
-		xrcd_table_delete(file->device, inode);
-
-	idr_remove_uobj(uobj);
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	put_uobj(uobj);
-	ret = in_len;
-
-out:
-	mutex_unlock(&file->device->xrcd_tree_mutex);
-	return ret;
+	ret = uobj_remove_commit(uobj);
+	return ret ?: in_len;
 }
 
 int ib_uverbs_dealloc_xrcd(struct ib_uverbs_device *dev,
@@ -1009,14 +639,11 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 	if (ret)
 		return ret;
 
-	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
-	if (!uobj)
-		return -ENOMEM;
-
-	init_uobj(uobj, 0, file->ucontext, &mr_lock_class);
-	down_write(&uobj->mutex);
+	uobj  = uobj_alloc(uobj_get_type(mr), file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	pd = idr_read_pd(cmd.pd_handle, file->ucontext);
+	pd = uobj_get_obj_read(pd, cmd.pd_handle, file->ucontext);
 	if (!pd) {
 		ret = -EINVAL;
 		goto err_free;
@@ -1030,10 +657,6 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 			goto err_put;
 		}
 	}
-	ret = ib_rdmacg_try_charge(&uobj->cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret)
-		goto err_charge;
 
 	mr = pd->device->reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va,
 				     cmd.access_flags, &udata);
@@ -1048,9 +671,6 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 	atomic_inc(&pd->usecnt);
 
 	uobj->object = mr;
-	ret = idr_add_uobj(uobj);
-	if (ret)
-		goto err_unreg;
 
 	memset(&resp, 0, sizeof resp);
 	resp.lkey      = mr->lkey;
@@ -1063,32 +683,20 @@ ssize_t ib_uverbs_reg_mr(struct ib_uverbs_file *file,
 		goto err_copy;
 	}
 
-	put_pd_read(pd);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&uobj->list, &file->ucontext->mr_list);
-	mutex_unlock(&file->mutex);
+	uobj_put_obj_read(pd);
 
-	uobj->live = 1;
-
-	up_write(&uobj->mutex);
+	uobj_alloc_commit(uobj);
 
 	return in_len;
 
 err_copy:
-	idr_remove_uobj(uobj);
-
-err_unreg:
 	ib_dereg_mr(mr);
 
 err_put:
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-
-err_charge:
-	put_pd_read(pd);
+	uobj_put_obj_read(pd);
 
 err_free:
-	put_uobj_write(uobj);
+	uobj_alloc_abort(uobj);
 	return ret;
 }
 
@@ -1124,10 +732,10 @@ ssize_t ib_uverbs_rereg_mr(struct ib_uverbs_file *file,
 	     (cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK)))
 			return -EINVAL;
 
-	uobj = idr_write_uobj(cmd.mr_handle, file->ucontext);
-
-	if (!uobj)
-		return -EINVAL;
+	uobj  = uobj_get_write(uobj_get_type(mr), cmd.mr_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
 	mr = uobj->object;
 
@@ -1138,7 +746,7 @@ ssize_t ib_uverbs_rereg_mr(struct ib_uverbs_file *file,
 	}
 
 	if (cmd.flags & IB_MR_REREG_PD) {
-		pd = idr_read_pd(cmd.pd_handle, file->ucontext);
+		pd = uobj_get_obj_read(pd, cmd.pd_handle, file->ucontext);
 		if (!pd) {
 			ret = -EINVAL;
 			goto put_uobjs;
@@ -1171,11 +779,10 @@ ssize_t ib_uverbs_rereg_mr(struct ib_uverbs_file *file,
 
 put_uobj_pd:
 	if (cmd.flags & IB_MR_REREG_PD)
-		put_pd_read(pd);
+		uobj_put_obj_read(pd);
 
 put_uobjs:
-
-	put_uobj_write(mr->uobject);
+	uobj_put_write(uobj);
 
 	return ret;
 }
@@ -1186,38 +793,20 @@ ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
 			   int out_len)
 {
 	struct ib_uverbs_dereg_mr cmd;
-	struct ib_mr             *mr;
 	struct ib_uobject	 *uobj;
 	int                       ret = -EINVAL;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj = idr_write_uobj(cmd.mr_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
-
-	mr = uobj->object;
-
-	ret = ib_dereg_mr(mr);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
+	uobj  = uobj_get_write(uobj_get_type(mr), cmd.mr_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	if (ret)
-		return ret;
+	ret = uobj_remove_commit(uobj);
 
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	put_uobj(uobj);
-
-	return in_len;
+	return ret ?: in_len;
 }
 
 ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
@@ -1239,14 +828,11 @@ ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
 		return -EFAULT;
 
-	uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
-	if (!uobj)
-		return -ENOMEM;
+	uobj  = uobj_alloc(uobj_get_type(mw), file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	init_uobj(uobj, 0, file->ucontext, &mw_lock_class);
-	down_write(&uobj->mutex);
-
-	pd = idr_read_pd(cmd.pd_handle, file->ucontext);
+	pd = uobj_get_obj_read(pd, cmd.pd_handle, file->ucontext);
 	if (!pd) {
 		ret = -EINVAL;
 		goto err_free;
@@ -1257,11 +843,6 @@ ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
 		   in_len - sizeof(cmd) - sizeof(struct ib_uverbs_cmd_hdr),
 		   out_len - sizeof(resp));
 
-	ret = ib_rdmacg_try_charge(&uobj->cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret)
-		goto err_charge;
-
 	mw = pd->device->alloc_mw(pd, cmd.mw_type, &udata);
 	if (IS_ERR(mw)) {
 		ret = PTR_ERR(mw);
@@ -1274,9 +855,6 @@ ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
 	atomic_inc(&pd->usecnt);
 
 	uobj->object = mw;
-	ret = idr_add_uobj(uobj);
-	if (ret)
-		goto err_unalloc;
 
 	memset(&resp, 0, sizeof(resp));
 	resp.rkey      = mw->rkey;
@@ -1288,32 +866,17 @@ ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
 		goto err_copy;
 	}
 
-	put_pd_read(pd);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&uobj->list, &file->ucontext->mw_list);
-	mutex_unlock(&file->mutex);
-
-	uobj->live = 1;
-
-	up_write(&uobj->mutex);
+	uobj_put_obj_read(pd);
+	uobj_alloc_commit(uobj);
 
 	return in_len;
 
 err_copy:
-	idr_remove_uobj(uobj);
-
-err_unalloc:
 	uverbs_dealloc_mw(mw);
-
 err_put:
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-
-err_charge:
-	put_pd_read(pd);
-
+	uobj_put_obj_read(pd);
 err_free:
-	put_uobj_write(uobj);
+	uobj_alloc_abort(uobj);
 	return ret;
 }
 
@@ -1323,38 +886,19 @@ ssize_t ib_uverbs_dealloc_mw(struct ib_uverbs_file *file,
 			     int out_len)
 {
 	struct ib_uverbs_dealloc_mw cmd;
-	struct ib_mw               *mw;
 	struct ib_uobject	   *uobj;
 	int                         ret = -EINVAL;
 
 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
 		return -EFAULT;
 
-	uobj = idr_write_uobj(cmd.mw_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
-
-	mw = uobj->object;
+	uobj  = uobj_get_write(uobj_get_type(mw), cmd.mw_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	ret = uverbs_dealloc_mw(mw);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
-
-	if (ret)
-		return ret;
-
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	put_uobj(uobj);
-
-	return in_len;
+	ret = uobj_remove_commit(uobj);
+	return ret ?: in_len;
 }
 
 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
@@ -1418,12 +962,10 @@ static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
 	if (cmd->comp_vector >= file->device->num_comp_vectors)
 		return ERR_PTR(-EINVAL);
 
-	obj = kmalloc(sizeof *obj, GFP_KERNEL);
-	if (!obj)
-		return ERR_PTR(-ENOMEM);
-
-	init_uobj(&obj->uobject, cmd->user_handle, file->ucontext, &cq_lock_class);
-	down_write(&obj->uobject.mutex);
+	obj  = (struct ib_ucq_object *)uobj_alloc(uobj_get_type(cq),
+						  file->ucontext);
+	if (IS_ERR(obj))
+		return obj;
 
 	if (cmd->comp_channel >= 0) {
 		ev_file = ib_uverbs_lookup_comp_file(cmd->comp_channel);
@@ -1433,6 +975,7 @@ static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
 		}
 	}
 
+	obj->uobject.user_handle = cmd->user_handle;
 	obj->uverbs_file	   = file;
 	obj->comp_events_reported  = 0;
 	obj->async_events_reported = 0;
@@ -1445,13 +988,7 @@ static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
 	if (cmd_sz > offsetof(typeof(*cmd), flags) + sizeof(cmd->flags))
 		attr.flags = cmd->flags;
 
-	ret = ib_rdmacg_try_charge(&obj->uobject.cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret)
-		goto err_charge;
-
-	cq = ib_dev->create_cq(ib_dev, &attr,
-					     file->ucontext, uhw);
+	cq = ib_dev->create_cq(ib_dev, &attr, file->ucontext, uhw);
 	if (IS_ERR(cq)) {
 		ret = PTR_ERR(cq);
 		goto err_file;
@@ -1465,10 +1002,6 @@ static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
 	atomic_set(&cq->usecnt, 0);
 
 	obj->uobject.object = cq;
-	ret = idr_add_uobj(&obj->uobject);
-	if (ret)
-		goto err_free;
-
 	memset(&resp, 0, sizeof resp);
 	resp.base.cq_handle = obj->uobject.id;
 	resp.base.cqe       = cq->cqe;
@@ -1480,32 +1013,19 @@ static struct ib_ucq_object *create_cq(struct ib_uverbs_file *file,
 	if (ret)
 		goto err_cb;
 
-	mutex_lock(&file->mutex);
-	list_add_tail(&obj->uobject.list, &file->ucontext->cq_list);
-	mutex_unlock(&file->mutex);
-
-	obj->uobject.live = 1;
-
-	up_write(&obj->uobject.mutex);
+	uobj_alloc_commit(&obj->uobject);
 
 	return obj;
 
 err_cb:
-	idr_remove_uobj(&obj->uobject);
-
-err_free:
 	ib_destroy_cq(cq);
 
 err_file:
-	ib_rdmacg_uncharge(&obj->uobject.cg_obj, ib_dev,
-			   RDMACG_RESOURCE_HCA_OBJECT);
-
-err_charge:
 	if (ev_file)
 		ib_uverbs_release_ucq(file, ev_file, obj);
 
 err:
-	put_uobj_write(&obj->uobject);
+	uobj_alloc_abort(&obj->uobject);
 
 	return ERR_PTR(ret);
 }
@@ -1628,7 +1148,7 @@ ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
 		   (unsigned long) cmd.response + sizeof resp,
 		   in_len - sizeof cmd, out_len - sizeof resp);
 
-	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
+	cq = uobj_get_obj_read(cq, cmd.cq_handle, file->ucontext);
 	if (!cq)
 		return -EINVAL;
 
@@ -1643,7 +1163,7 @@ ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
 		ret = -EFAULT;
 
 out:
-	put_cq_read(cq);
+	uobj_put_obj_read(cq);
 
 	return ret ? ret : in_len;
 }
@@ -1690,7 +1210,7 @@ ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
+	cq = uobj_get_obj_read(cq, cmd.cq_handle, file->ucontext);
 	if (!cq)
 		return -EINVAL;
 
@@ -1722,7 +1242,7 @@ ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
 	ret = in_len;
 
 out_put:
-	put_cq_read(cq);
+	uobj_put_obj_read(cq);
 	return ret;
 }
 
@@ -1737,14 +1257,14 @@ ssize_t ib_uverbs_req_notify_cq(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
+	cq = uobj_get_obj_read(cq, cmd.cq_handle, file->ucontext);
 	if (!cq)
 		return -EINVAL;
 
 	ib_req_notify_cq(cq, cmd.solicited_only ?
 			 IB_CQ_SOLICITED : IB_CQ_NEXT_COMP);
 
-	put_cq_read(cq);
+	uobj_put_obj_read(cq);
 
 	return in_len;
 }
@@ -1765,37 +1285,32 @@ ssize_t ib_uverbs_destroy_cq(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj = idr_write_uobj(cmd.cq_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
+	uobj  = uobj_get_write(uobj_get_type(cq), cmd.cq_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
+
+	/*
+	 * Make sure we don't free the memory in remove_commit as we still
+	 * needs the uobject memory to create the response.
+	 */
+	uverbs_uobject_get(uobj);
 	cq      = uobj->object;
 	ev_file = cq->cq_context;
 	obj     = container_of(cq->uobject, struct ib_ucq_object, uobject);
 
-	ret = ib_destroy_cq(cq);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
+	memset(&resp, 0, sizeof(resp));
 
-	if (ret)
+	ret = uobj_remove_commit(uobj);
+	if (ret) {
+		uverbs_uobject_put(uobj);
 		return ret;
+	}
 
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	ib_uverbs_release_ucq(file, ev_file, obj);
-
-	memset(&resp, 0, sizeof resp);
 	resp.comp_events_reported  = obj->comp_events_reported;
 	resp.async_events_reported = obj->async_events_reported;
 
-	put_uobj(uobj);
-
+	uverbs_uobject_put(uobj);
 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
 			 &resp, sizeof resp))
 		return -EFAULT;
@@ -1817,7 +1332,7 @@ static int create_qp(struct ib_uverbs_file *file,
 	struct ib_device		*device;
 	struct ib_pd			*pd = NULL;
 	struct ib_xrcd			*xrcd = NULL;
-	struct ib_uobject		*uninitialized_var(xrcd_uobj);
+	struct ib_uobject		*xrcd_uobj = ERR_PTR(-ENOENT);
 	struct ib_cq			*scq = NULL, *rcq = NULL;
 	struct ib_srq			*srq = NULL;
 	struct ib_qp			*qp;
@@ -1831,18 +1346,19 @@ static int create_qp(struct ib_uverbs_file *file,
 	if (cmd->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
 		return -EPERM;
 
-	obj = kzalloc(sizeof *obj, GFP_KERNEL);
-	if (!obj)
-		return -ENOMEM;
+	obj  = (struct ib_uqp_object *)uobj_alloc(uobj_get_type(qp),
+						  file->ucontext);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+	obj->uxrcd = NULL;
+	obj->uevent.uobject.user_handle = cmd->user_handle;
 
-	init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext,
-		  &qp_lock_class);
-	down_write(&obj->uevent.uobject.mutex);
 	if (cmd_sz >= offsetof(typeof(*cmd), rwq_ind_tbl_handle) +
 		      sizeof(cmd->rwq_ind_tbl_handle) &&
 		      (cmd->comp_mask & IB_UVERBS_CREATE_QP_MASK_IND_TABLE)) {
-		ind_tbl = idr_read_rwq_indirection_table(cmd->rwq_ind_tbl_handle,
-							 file->ucontext);
+		ind_tbl = uobj_get_obj_read(rwq_ind_table,
+					    cmd->rwq_ind_tbl_handle,
+					    file->ucontext);
 		if (!ind_tbl) {
 			ret = -EINVAL;
 			goto err_put;
@@ -1866,8 +1382,15 @@ static int create_qp(struct ib_uverbs_file *file,
 		has_sq = false;
 
 	if (cmd->qp_type == IB_QPT_XRC_TGT) {
-		xrcd = idr_read_xrcd(cmd->pd_handle, file->ucontext,
-				     &xrcd_uobj);
+		xrcd_uobj = uobj_get_read(uobj_get_type(xrcd), cmd->pd_handle,
+					  file->ucontext);
+
+		if (IS_ERR(xrcd_uobj)) {
+			ret = -EINVAL;
+			goto err_put;
+		}
+
+		xrcd = (struct ib_xrcd *)xrcd_uobj->object;
 		if (!xrcd) {
 			ret = -EINVAL;
 			goto err_put;
@@ -1879,8 +1402,8 @@ static int create_qp(struct ib_uverbs_file *file,
 			cmd->max_recv_sge = 0;
 		} else {
 			if (cmd->is_srq) {
-				srq = idr_read_srq(cmd->srq_handle,
-						   file->ucontext);
+				srq = uobj_get_obj_read(srq, cmd->srq_handle,
+							file->ucontext);
 				if (!srq || srq->srq_type != IB_SRQT_BASIC) {
 					ret = -EINVAL;
 					goto err_put;
@@ -1889,8 +1412,8 @@ static int create_qp(struct ib_uverbs_file *file,
 
 			if (!ind_tbl) {
 				if (cmd->recv_cq_handle != cmd->send_cq_handle) {
-					rcq = idr_read_cq(cmd->recv_cq_handle,
-							  file->ucontext, 0);
+					rcq = uobj_get_obj_read(cq, cmd->recv_cq_handle,
+								file->ucontext);
 					if (!rcq) {
 						ret = -EINVAL;
 						goto err_put;
@@ -1900,10 +1423,11 @@ static int create_qp(struct ib_uverbs_file *file,
 		}
 
 		if (has_sq)
-			scq = idr_read_cq(cmd->send_cq_handle, file->ucontext, !!rcq);
+			scq = uobj_get_obj_read(cq, cmd->send_cq_handle,
+						file->ucontext);
 		if (!ind_tbl)
 			rcq = rcq ?: scq;
-		pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
+		pd  = uobj_get_obj_read(pd, cmd->pd_handle, file->ucontext);
 		if (!pd || (!scq && has_sq)) {
 			ret = -EINVAL;
 			goto err_put;
@@ -1955,11 +1479,6 @@ static int create_qp(struct ib_uverbs_file *file,
 			goto err_put;
 		}
 
-	ret = ib_rdmacg_try_charge(&obj->uevent.uobject.cg_obj, device,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret)
-		goto err_put;
-
 	if (cmd->qp_type == IB_QPT_XRC_TGT)
 		qp = ib_create_qp(pd, &attr);
 	else
@@ -1967,7 +1486,7 @@ static int create_qp(struct ib_uverbs_file *file,
 
 	if (IS_ERR(qp)) {
 		ret = PTR_ERR(qp);
-		goto err_create;
+		goto err_put;
 	}
 
 	if (cmd->qp_type != IB_QPT_XRC_TGT) {
@@ -1995,9 +1514,6 @@ static int create_qp(struct ib_uverbs_file *file,
 	qp->uobject = &obj->uevent.uobject;
 
 	obj->uevent.uobject.object = qp;
-	ret = idr_add_uobj(&obj->uevent.uobject);
-	if (ret)
-		goto err_destroy;
 
 	memset(&resp, 0, sizeof resp);
 	resp.base.qpn             = qp->qp_num;
@@ -2019,54 +1535,41 @@ static int create_qp(struct ib_uverbs_file *file,
 		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
 					  uobject);
 		atomic_inc(&obj->uxrcd->refcnt);
-		put_xrcd_read(xrcd_uobj);
+		uobj_put_read(xrcd_uobj);
 	}
 
 	if (pd)
-		put_pd_read(pd);
+		uobj_put_obj_read(pd);
 	if (scq)
-		put_cq_read(scq);
+		uobj_put_obj_read(scq);
 	if (rcq && rcq != scq)
-		put_cq_read(rcq);
+		uobj_put_obj_read(rcq);
 	if (srq)
-		put_srq_read(srq);
+		uobj_put_obj_read(srq);
 	if (ind_tbl)
-		put_rwq_indirection_table_read(ind_tbl);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
-	mutex_unlock(&file->mutex);
-
-	obj->uevent.uobject.live = 1;
+		uobj_put_obj_read(ind_tbl);
 
-	up_write(&obj->uevent.uobject.mutex);
+	uobj_alloc_commit(&obj->uevent.uobject);
 
 	return 0;
 err_cb:
-	idr_remove_uobj(&obj->uevent.uobject);
-
-err_destroy:
 	ib_destroy_qp(qp);
 
-err_create:
-	ib_rdmacg_uncharge(&obj->uevent.uobject.cg_obj, device,
-			   RDMACG_RESOURCE_HCA_OBJECT);
-
 err_put:
-	if (xrcd)
-		put_xrcd_read(xrcd_uobj);
+	if (!IS_ERR(xrcd_uobj))
+		uobj_put_read(xrcd_uobj);
 	if (pd)
-		put_pd_read(pd);
+		uobj_put_obj_read(pd);
 	if (scq)
-		put_cq_read(scq);
+		uobj_put_obj_read(scq);
 	if (rcq && rcq != scq)
-		put_cq_read(rcq);
+		uobj_put_obj_read(rcq);
 	if (srq)
-		put_srq_read(srq);
+		uobj_put_obj_read(srq);
 	if (ind_tbl)
-		put_rwq_indirection_table_read(ind_tbl);
+		uobj_put_obj_read(ind_tbl);
 
-	put_uobj_write(&obj->uevent.uobject);
+	uobj_alloc_abort(&obj->uevent.uobject);
 	return ret;
 }
 
@@ -2202,17 +1705,22 @@ ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
 		   (unsigned long) cmd.response + sizeof resp,
 		   in_len - sizeof cmd, out_len - sizeof resp);
 
-	obj = kmalloc(sizeof *obj, GFP_KERNEL);
-	if (!obj)
-		return -ENOMEM;
+	obj  = (struct ib_uqp_object *)uobj_alloc(uobj_get_type(qp),
+						  file->ucontext);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
 
-	init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext, &qp_lock_class);
-	down_write(&obj->uevent.uobject.mutex);
+	xrcd_uobj = uobj_get_read(uobj_get_type(xrcd), cmd.pd_handle,
+				  file->ucontext);
+	if (IS_ERR(xrcd_uobj)) {
+		ret = -EINVAL;
+		goto err_put;
+	}
 
-	xrcd = idr_read_xrcd(cmd.pd_handle, file->ucontext, &xrcd_uobj);
+	xrcd = (struct ib_xrcd *)xrcd_uobj->object;
 	if (!xrcd) {
 		ret = -EINVAL;
-		goto err_put;
+		goto err_xrcd;
 	}
 
 	attr.event_handler = ib_uverbs_qp_event_handler;
@@ -2227,15 +1735,11 @@ ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
 	qp = ib_open_qp(xrcd, &attr);
 	if (IS_ERR(qp)) {
 		ret = PTR_ERR(qp);
-		goto err_put;
+		goto err_xrcd;
 	}
 
-	qp->uobject = &obj->uevent.uobject;
-
 	obj->uevent.uobject.object = qp;
-	ret = idr_add_uobj(&obj->uevent.uobject);
-	if (ret)
-		goto err_destroy;
+	obj->uevent.uobject.user_handle = cmd.user_handle;
 
 	memset(&resp, 0, sizeof resp);
 	resp.qpn       = qp->qp_num;
@@ -2244,32 +1748,25 @@ ssize_t ib_uverbs_open_qp(struct ib_uverbs_file *file,
 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
 			 &resp, sizeof resp)) {
 		ret = -EFAULT;
-		goto err_remove;
+		goto err_destroy;
 	}
 
 	obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
 	atomic_inc(&obj->uxrcd->refcnt);
-	put_xrcd_read(xrcd_uobj);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->qp_list);
-	mutex_unlock(&file->mutex);
+	qp->uobject = &obj->uevent.uobject;
+	uobj_put_read(xrcd_uobj);
 
-	obj->uevent.uobject.live = 1;
 
-	up_write(&obj->uevent.uobject.mutex);
+	uobj_alloc_commit(&obj->uevent.uobject);
 
 	return in_len;
 
-err_remove:
-	idr_remove_uobj(&obj->uevent.uobject);
-
 err_destroy:
 	ib_destroy_qp(qp);
-
+err_xrcd:
+	uobj_put_read(xrcd_uobj);
 err_put:
-	put_xrcd_read(xrcd_uobj);
-	put_uobj_write(&obj->uevent.uobject);
+	uobj_alloc_abort(&obj->uevent.uobject);
 	return ret;
 }
 
@@ -2295,7 +1792,7 @@ ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
 		goto out;
 	}
 
-	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd.qp_handle, file->ucontext);
 	if (!qp) {
 		ret = -EINVAL;
 		goto out;
@@ -2303,7 +1800,7 @@ ssize_t ib_uverbs_query_qp(struct ib_uverbs_file *file,
 
 	ret = ib_query_qp(qp, attr, cmd.attr_mask, init_attr);
 
-	put_qp_read(qp);
+	uobj_put_obj_read(qp);
 
 	if (ret)
 		goto out;
@@ -2399,7 +1896,7 @@ static int modify_qp(struct ib_uverbs_file *file,
 	if (!attr)
 		return -ENOMEM;
 
-	qp = idr_read_qp(cmd->base.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd->base.qp_handle, file->ucontext);
 	if (!qp) {
 		ret = -EINVAL;
 		goto out;
@@ -2471,7 +1968,7 @@ static int modify_qp(struct ib_uverbs_file *file,
 	}
 
 release_qp:
-	put_qp_read(qp);
+	uobj_put_obj_read(qp);
 
 out:
 	kfree(attr);
@@ -2558,42 +2055,27 @@ ssize_t ib_uverbs_destroy_qp(struct ib_uverbs_file *file,
 
 	memset(&resp, 0, sizeof resp);
 
-	uobj = idr_write_uobj(cmd.qp_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
+	uobj  = uobj_get_write(uobj_get_type(qp), cmd.qp_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
+
 	qp  = uobj->object;
 	obj = container_of(uobj, struct ib_uqp_object, uevent.uobject);
+	/*
+	 * Make sure we don't free the memory in remove_commit as we still
+	 * needs the uobject memory to create the response.
+	 */
+	uverbs_uobject_get(uobj);
 
-	if (!list_empty(&obj->mcast_list)) {
-		put_uobj_write(uobj);
-		return -EBUSY;
-	}
-
-	ret = ib_destroy_qp(qp);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
-
-	if (ret)
+	ret = uobj_remove_commit(uobj);
+	if (ret) {
+		uverbs_uobject_put(uobj);
 		return ret;
-
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-
-	if (obj->uxrcd)
-		atomic_dec(&obj->uxrcd->refcnt);
-
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	ib_uverbs_release_uevent(file, &obj->uevent);
+	}
 
 	resp.events_reported = obj->uevent.events_reported;
-
-	put_uobj(uobj);
+	uverbs_uobject_put(uobj);
 
 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
 			 &resp, sizeof resp))
@@ -2637,7 +2119,7 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 	if (!user_wr)
 		return -ENOMEM;
 
-	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd.qp_handle, file->ucontext);
 	if (!qp)
 		goto out;
 
@@ -2673,7 +2155,8 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 				goto out_put;
 			}
 
-			ud->ah = idr_read_ah(user_wr->wr.ud.ah, file->ucontext);
+			ud->ah = uobj_get_obj_read(ah, user_wr->wr.ud.ah,
+						   file->ucontext);
 			if (!ud->ah) {
 				kfree(ud);
 				ret = -EINVAL;
@@ -2780,11 +2263,11 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 		ret = -EFAULT;
 
 out_put:
-	put_qp_read(qp);
+	uobj_put_obj_read(qp);
 
 	while (wr) {
 		if (is_ud && ud_wr(wr)->ah)
-			put_ah_read(ud_wr(wr)->ah);
+			uobj_put_obj_read(ud_wr(wr)->ah);
 		next = wr->next;
 		kfree(wr);
 		wr = next;
@@ -2901,21 +2384,21 @@ ssize_t ib_uverbs_post_recv(struct ib_uverbs_file *file,
 	if (IS_ERR(wr))
 		return PTR_ERR(wr);
 
-	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd.qp_handle, file->ucontext);
 	if (!qp)
 		goto out;
 
 	resp.bad_wr = 0;
 	ret = qp->device->post_recv(qp->real_qp, wr, &bad_wr);
 
-	put_qp_read(qp);
-
-	if (ret)
+	uobj_put_obj_read(qp);
+	if (ret) {
 		for (next = wr; next; next = next->next) {
 			++resp.bad_wr;
 			if (next == bad_wr)
 				break;
 		}
+	}
 
 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
 			 &resp, sizeof resp))
@@ -2951,14 +2434,14 @@ ssize_t ib_uverbs_post_srq_recv(struct ib_uverbs_file *file,
 	if (IS_ERR(wr))
 		return PTR_ERR(wr);
 
-	srq = idr_read_srq(cmd.srq_handle, file->ucontext);
+	srq = uobj_get_obj_read(srq, cmd.srq_handle, file->ucontext);
 	if (!srq)
 		goto out;
 
 	resp.bad_wr = 0;
 	ret = srq->device->post_srq_recv(srq, wr, &bad_wr);
 
-	put_srq_read(srq);
+	uobj_put_obj_read(srq);
 
 	if (ret)
 		for (next = wr; next; next = next->next) {
@@ -3005,14 +2488,11 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
 		   (unsigned long)cmd.response + sizeof(resp),
 		   in_len - sizeof(cmd), out_len - sizeof(resp));
 
-	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
-	if (!uobj)
-		return -ENOMEM;
-
-	init_uobj(uobj, cmd.user_handle, file->ucontext, &ah_lock_class);
-	down_write(&uobj->mutex);
+	uobj  = uobj_alloc(uobj_get_type(ah), file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	pd = idr_read_pd(cmd.pd_handle, file->ucontext);
+	pd = uobj_get_obj_read(pd, cmd.pd_handle, file->ucontext);
 	if (!pd) {
 		ret = -EINVAL;
 		goto err;
@@ -3031,28 +2511,20 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
 	memset(&attr.dmac, 0, sizeof(attr.dmac));
 	memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
 
-	ret = ib_rdmacg_try_charge(&uobj->cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret)
-		goto err_charge;
-
 	ah = pd->device->create_ah(pd, &attr, &udata);
 
 	if (IS_ERR(ah)) {
 		ret = PTR_ERR(ah);
-		goto err_create;
+		goto err_put;
 	}
 
 	ah->device  = pd->device;
 	ah->pd      = pd;
 	atomic_inc(&pd->usecnt);
 	ah->uobject  = uobj;
+	uobj->user_handle = cmd.user_handle;
 	uobj->object = ah;
 
-	ret = idr_add_uobj(uobj);
-	if (ret)
-		goto err_destroy;
-
 	resp.ah_handle = uobj->id;
 
 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
@@ -3061,32 +2533,19 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
 		goto err_copy;
 	}
 
-	put_pd_read(pd);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&uobj->list, &file->ucontext->ah_list);
-	mutex_unlock(&file->mutex);
-
-	uobj->live = 1;
-
-	up_write(&uobj->mutex);
+	uobj_put_obj_read(pd);
+	uobj_alloc_commit(uobj);
 
 	return in_len;
 
 err_copy:
-	idr_remove_uobj(uobj);
-
-err_destroy:
 	ib_destroy_ah(ah);
 
-err_create:
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-
-err_charge:
-	put_pd_read(pd);
+err_put:
+	uobj_put_obj_read(pd);
 
 err:
-	put_uobj_write(uobj);
+	uobj_alloc_abort(uobj);
 	return ret;
 }
 
@@ -3095,37 +2554,19 @@ ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
 			     const char __user *buf, int in_len, int out_len)
 {
 	struct ib_uverbs_destroy_ah cmd;
-	struct ib_ah		   *ah;
 	struct ib_uobject	   *uobj;
 	int			    ret;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj = idr_write_uobj(cmd.ah_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
-	ah = uobj->object;
-
-	ret = ib_destroy_ah(ah);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
-
-	if (ret)
-		return ret;
-
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
+	uobj  = uobj_get_write(uobj_get_type(ah), cmd.ah_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	put_uobj(uobj);
-
-	return in_len;
+	ret = uobj_remove_commit(uobj);
+	return ret ?: in_len;
 }
 
 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
@@ -3142,7 +2583,7 @@ ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	qp = idr_write_qp(cmd.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd.qp_handle, file->ucontext);
 	if (!qp)
 		return -EINVAL;
 
@@ -3171,7 +2612,7 @@ ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
 		kfree(mcast);
 
 out_put:
-	put_qp_write(qp);
+	uobj_put_obj_read(qp);
 
 	return ret ? ret : in_len;
 }
@@ -3190,16 +2631,16 @@ ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	qp = idr_write_qp(cmd.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd.qp_handle, file->ucontext);
 	if (!qp)
 		return -EINVAL;
 
+	obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
+
 	ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
 	if (ret)
 		goto out_put;
 
-	obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
-
 	list_for_each_entry(mcast, &obj->mcast_list, list)
 		if (cmd.mlid == mcast->lid &&
 		    !memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
@@ -3209,8 +2650,7 @@ ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
 		}
 
 out_put:
-	put_qp_write(qp);
-
+	uobj_put_obj_read(qp);
 	return ret ? ret : in_len;
 }
 
@@ -3402,20 +2842,18 @@ int ib_uverbs_ex_create_wq(struct ib_uverbs_file *file,
 	if (cmd.comp_mask)
 		return -EOPNOTSUPP;
 
-	obj = kmalloc(sizeof(*obj), GFP_KERNEL);
-	if (!obj)
-		return -ENOMEM;
+	obj  = (struct ib_uwq_object *)uobj_alloc(uobj_get_type(wq),
+						  file->ucontext);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
 
-	init_uobj(&obj->uevent.uobject, cmd.user_handle, file->ucontext,
-		  &wq_lock_class);
-	down_write(&obj->uevent.uobject.mutex);
-	pd  = idr_read_pd(cmd.pd_handle, file->ucontext);
+	pd  = uobj_get_obj_read(pd, cmd.pd_handle, file->ucontext);
 	if (!pd) {
 		err = -EINVAL;
 		goto err_uobj;
 	}
 
-	cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0);
+	cq = uobj_get_obj_read(cq, cmd.cq_handle, file->ucontext);
 	if (!cq) {
 		err = -EINVAL;
 		goto err_put_pd;
@@ -3450,9 +2888,6 @@ int ib_uverbs_ex_create_wq(struct ib_uverbs_file *file,
 	atomic_inc(&cq->usecnt);
 	wq->uobject = &obj->uevent.uobject;
 	obj->uevent.uobject.object = wq;
-	err = idr_add_uobj(&obj->uevent.uobject);
-	if (err)
-		goto destroy_wq;
 
 	memset(&resp, 0, sizeof(resp));
 	resp.wq_handle = obj->uevent.uobject.id;
@@ -3465,27 +2900,19 @@ int ib_uverbs_ex_create_wq(struct ib_uverbs_file *file,
 	if (err)
 		goto err_copy;
 
-	put_pd_read(pd);
-	put_cq_read(cq);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->wq_list);
-	mutex_unlock(&file->mutex);
-
-	obj->uevent.uobject.live = 1;
-	up_write(&obj->uevent.uobject.mutex);
+	uobj_put_obj_read(pd);
+	uobj_put_obj_read(cq);
+	uobj_alloc_commit(&obj->uevent.uobject);
 	return 0;
 
 err_copy:
-	idr_remove_uobj(&obj->uevent.uobject);
-destroy_wq:
 	ib_destroy_wq(wq);
 err_put_cq:
-	put_cq_read(cq);
+	uobj_put_obj_read(cq);
 err_put_pd:
-	put_pd_read(pd);
+	uobj_put_obj_read(pd);
 err_uobj:
-	put_uobj_write(&obj->uevent.uobject);
+	uobj_alloc_abort(&obj->uevent.uobject);
 
 	return err;
 }
@@ -3526,31 +2953,27 @@ int ib_uverbs_ex_destroy_wq(struct ib_uverbs_file *file,
 		return -EOPNOTSUPP;
 
 	resp.response_length = required_resp_len;
-	uobj = idr_write_uobj(cmd.wq_handle,
-			      file->ucontext);
-	if (!uobj)
-		return -EINVAL;
+	uobj  = uobj_get_write(uobj_get_type(wq), cmd.wq_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
 	wq = uobj->object;
 	obj = container_of(uobj, struct ib_uwq_object, uevent.uobject);
-	ret = ib_destroy_wq(wq);
-	if (!ret)
-		uobj->live = 0;
+	/*
+	 * Make sure we don't free the memory in remove_commit as we still
+	 * needs the uobject memory to create the response.
+	 */
+	uverbs_uobject_get(uobj);
 
-	put_uobj_write(uobj);
-	if (ret)
+	ret = uobj_remove_commit(uobj);
+	if (ret) {
+		uverbs_uobject_put(uobj);
 		return ret;
+	}
 
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	ib_uverbs_release_uevent(file, &obj->uevent);
 	resp.events_reported = obj->uevent.events_reported;
-	put_uobj(uobj);
-
+	uverbs_uobject_put(uobj);
 	ret = ib_copy_to_udata(ucore, &resp, resp.response_length);
 	if (ret)
 		return ret;
@@ -3588,7 +3011,7 @@ int ib_uverbs_ex_modify_wq(struct ib_uverbs_file *file,
 	if (cmd.attr_mask > (IB_WQ_STATE | IB_WQ_CUR_STATE | IB_WQ_FLAGS))
 		return -EINVAL;
 
-	wq = idr_read_wq(cmd.wq_handle, file->ucontext);
+	wq = uobj_get_obj_read(wq, cmd.wq_handle, file->ucontext);
 	if (!wq)
 		return -EINVAL;
 
@@ -3599,7 +3022,7 @@ int ib_uverbs_ex_modify_wq(struct ib_uverbs_file *file,
 		wq_attr.flags_mask = cmd.flags_mask;
 	}
 	ret = wq->device->modify_wq(wq, &wq_attr, cmd.attr_mask, uhw);
-	put_wq_read(wq);
+	uobj_put_obj_read(wq);
 	return ret;
 }
 
@@ -3677,7 +3100,8 @@ int ib_uverbs_ex_create_rwq_ind_table(struct ib_uverbs_file *file,
 
 	for (num_read_wqs = 0; num_read_wqs < num_wq_handles;
 			num_read_wqs++) {
-		wq = idr_read_wq(wqs_handles[num_read_wqs], file->ucontext);
+		wq = uobj_get_obj_read(wq, wqs_handles[num_read_wqs],
+				       file->ucontext);
 		if (!wq) {
 			err = -EINVAL;
 			goto put_wqs;
@@ -3686,14 +3110,12 @@ int ib_uverbs_ex_create_rwq_ind_table(struct ib_uverbs_file *file,
 		wqs[num_read_wqs] = wq;
 	}
 
-	uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
-	if (!uobj) {
-		err = -ENOMEM;
+	uobj  = uobj_alloc(uobj_get_type(rwq_ind_table), file->ucontext);
+	if (IS_ERR(uobj)) {
+		err = PTR_ERR(uobj);
 		goto put_wqs;
 	}
 
-	init_uobj(uobj, 0, file->ucontext, &rwq_ind_table_lock_class);
-	down_write(&uobj->mutex);
 	init_attr.log_ind_tbl_size = cmd.log_ind_tbl_size;
 	init_attr.ind_tbl = wqs;
 	rwq_ind_tbl = ib_dev->create_rwq_ind_table(ib_dev, &init_attr, uhw);
@@ -3713,10 +3135,6 @@ int ib_uverbs_ex_create_rwq_ind_table(struct ib_uverbs_file *file,
 	for (i = 0; i < num_wq_handles; i++)
 		atomic_inc(&wqs[i]->usecnt);
 
-	err = idr_add_uobj(uobj);
-	if (err)
-		goto destroy_ind_tbl;
-
 	resp.ind_tbl_handle = uobj->id;
 	resp.ind_tbl_num = rwq_ind_tbl->ind_tbl_num;
 	resp.response_length = required_resp_len;
@@ -3729,26 +3147,18 @@ int ib_uverbs_ex_create_rwq_ind_table(struct ib_uverbs_file *file,
 	kfree(wqs_handles);
 
 	for (j = 0; j < num_read_wqs; j++)
-		put_wq_read(wqs[j]);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&uobj->list, &file->ucontext->rwq_ind_tbl_list);
-	mutex_unlock(&file->mutex);
+		uobj_put_obj_read(wqs[j]);
 
-	uobj->live = 1;
-
-	up_write(&uobj->mutex);
+	uobj_alloc_commit(uobj);
 	return 0;
 
 err_copy:
-	idr_remove_uobj(uobj);
-destroy_ind_tbl:
 	ib_destroy_rwq_ind_table(rwq_ind_tbl);
 err_uobj:
-	put_uobj_write(uobj);
+	uobj_alloc_abort(uobj);
 put_wqs:
 	for (j = 0; j < num_read_wqs; j++)
-		put_wq_read(wqs[j]);
+		uobj_put_obj_read(wqs[j]);
 err_free:
 	kfree(wqs_handles);
 	kfree(wqs);
@@ -3761,10 +3171,8 @@ int ib_uverbs_ex_destroy_rwq_ind_table(struct ib_uverbs_file *file,
 				       struct ib_udata *uhw)
 {
 	struct ib_uverbs_ex_destroy_rwq_ind_table	cmd = {};
-	struct ib_rwq_ind_table *rwq_ind_tbl;
 	struct ib_uobject		*uobj;
 	int			ret;
-	struct ib_wq	**ind_tbl;
 	size_t required_cmd_sz;
 
 	required_cmd_sz = offsetof(typeof(cmd), ind_tbl_handle) + sizeof(cmd.ind_tbl_handle);
@@ -3784,31 +3192,12 @@ int ib_uverbs_ex_destroy_rwq_ind_table(struct ib_uverbs_file *file,
 	if (cmd.comp_mask)
 		return -EOPNOTSUPP;
 
-	uobj = idr_write_uobj(cmd.ind_tbl_handle,
-			      file->ucontext);
-	if (!uobj)
-		return -EINVAL;
-	rwq_ind_tbl = uobj->object;
-	ind_tbl = rwq_ind_tbl->ind_tbl;
-
-	ret = ib_destroy_rwq_ind_table(rwq_ind_tbl);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
-
-	if (ret)
-		return ret;
-
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
+	uobj  = uobj_get_write(uobj_get_type(rwq_ind_table), cmd.ind_tbl_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
-	put_uobj(uobj);
-	kfree(ind_tbl);
-	return ret;
+	return uobj_remove_commit(uobj);
 }
 
 int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
@@ -3882,15 +3271,13 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
 		kern_flow_attr = &cmd.flow_attr;
 	}
 
-	uobj = kmalloc(sizeof(*uobj), GFP_KERNEL);
-	if (!uobj) {
-		err = -ENOMEM;
+	uobj  = uobj_alloc(uobj_get_type(flow), file->ucontext);
+	if (IS_ERR(uobj)) {
+		err = PTR_ERR(uobj);
 		goto err_free_attr;
 	}
-	init_uobj(uobj, 0, file->ucontext, &rule_lock_class);
-	down_write(&uobj->mutex);
 
-	qp = idr_read_qp(cmd.qp_handle, file->ucontext);
+	qp = uobj_get_obj_read(qp, cmd.qp_handle, file->ucontext);
 	if (!qp) {
 		err = -EINVAL;
 		goto err_uobj;
@@ -3931,24 +3318,14 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
 		err = -EINVAL;
 		goto err_free;
 	}
-
-	err = ib_rdmacg_try_charge(&uobj->cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (err)
-		goto err_free;
-
 	flow_id = ib_create_flow(qp, flow_attr, IB_FLOW_DOMAIN_USER);
 	if (IS_ERR(flow_id)) {
 		err = PTR_ERR(flow_id);
-		goto err_create;
+		goto err_free;
 	}
 	flow_id->uobject = uobj;
 	uobj->object = flow_id;
 
-	err = idr_add_uobj(uobj);
-	if (err)
-		goto destroy_flow;
-
 	memset(&resp, 0, sizeof(resp));
 	resp.flow_handle = uobj->id;
 
@@ -3957,30 +3334,20 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
 	if (err)
 		goto err_copy;
 
-	put_qp_read(qp);
-	mutex_lock(&file->mutex);
-	list_add_tail(&uobj->list, &file->ucontext->rule_list);
-	mutex_unlock(&file->mutex);
-
-	uobj->live = 1;
-
-	up_write(&uobj->mutex);
+	uobj_put_obj_read(qp);
+	uobj_alloc_commit(uobj);
 	kfree(flow_attr);
 	if (cmd.flow_attr.num_of_specs)
 		kfree(kern_flow_attr);
 	return 0;
 err_copy:
-	idr_remove_uobj(uobj);
-destroy_flow:
 	ib_destroy_flow(flow_id);
-err_create:
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
 err_free:
 	kfree(flow_attr);
 err_put:
-	put_qp_read(qp);
+	uobj_put_obj_read(qp);
 err_uobj:
-	put_uobj_write(uobj);
+	uobj_alloc_abort(uobj);
 err_free_attr:
 	if (cmd.flow_attr.num_of_specs)
 		kfree(kern_flow_attr);
@@ -3993,7 +3360,6 @@ int ib_uverbs_ex_destroy_flow(struct ib_uverbs_file *file,
 			      struct ib_udata *uhw)
 {
 	struct ib_uverbs_destroy_flow	cmd;
-	struct ib_flow			*flow_id;
 	struct ib_uobject		*uobj;
 	int				ret;
 
@@ -4007,28 +3373,12 @@ int ib_uverbs_ex_destroy_flow(struct ib_uverbs_file *file,
 	if (cmd.comp_mask)
 		return -EINVAL;
 
-	uobj = idr_write_uobj(cmd.flow_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
-	flow_id = uobj->object;
-
-	ret = ib_destroy_flow(flow_id);
-	if (!ret) {
-		ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-		uobj->live = 0;
-	}
-
-	put_uobj_write(uobj);
-
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	put_uobj(uobj);
+	uobj  = uobj_get_write(uobj_get_type(flow), cmd.flow_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
 
+	ret = uobj_remove_commit(uobj);
 	return ret;
 }
 
@@ -4045,31 +3395,37 @@ static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
 	struct ib_srq_init_attr          attr;
 	int ret;
 
-	obj = kmalloc(sizeof *obj, GFP_KERNEL);
-	if (!obj)
-		return -ENOMEM;
-
-	init_uobj(&obj->uevent.uobject, cmd->user_handle, file->ucontext, &srq_lock_class);
-	down_write(&obj->uevent.uobject.mutex);
+	obj  = (struct ib_usrq_object *)uobj_alloc(uobj_get_type(srq),
+						   file->ucontext);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
 
 	if (cmd->srq_type == IB_SRQT_XRC) {
-		attr.ext.xrc.xrcd  = idr_read_xrcd(cmd->xrcd_handle, file->ucontext, &xrcd_uobj);
-		if (!attr.ext.xrc.xrcd) {
+		xrcd_uobj = uobj_get_read(uobj_get_type(xrcd), cmd->xrcd_handle,
+					  file->ucontext);
+		if (IS_ERR(xrcd_uobj)) {
 			ret = -EINVAL;
 			goto err;
 		}
 
+		attr.ext.xrc.xrcd = (struct ib_xrcd *)xrcd_uobj->object;
+		if (!attr.ext.xrc.xrcd) {
+			ret = -EINVAL;
+			goto err_put_xrcd;
+		}
+
 		obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object, uobject);
 		atomic_inc(&obj->uxrcd->refcnt);
 
-		attr.ext.xrc.cq  = idr_read_cq(cmd->cq_handle, file->ucontext, 0);
+		attr.ext.xrc.cq  = uobj_get_obj_read(cq, cmd->cq_handle,
+						     file->ucontext);
 		if (!attr.ext.xrc.cq) {
 			ret = -EINVAL;
 			goto err_put_xrcd;
 		}
 	}
 
-	pd  = idr_read_pd(cmd->pd_handle, file->ucontext);
+	pd  = uobj_get_obj_read(pd, cmd->pd_handle, file->ucontext);
 	if (!pd) {
 		ret = -EINVAL;
 		goto err_put_cq;
@@ -4085,11 +3441,6 @@ static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
 	obj->uevent.events_reported = 0;
 	INIT_LIST_HEAD(&obj->uevent.event_list);
 
-	ret = ib_rdmacg_try_charge(&obj->uevent.uobject.cg_obj, ib_dev,
-				   RDMACG_RESOURCE_HCA_OBJECT);
-	if (ret)
-		goto err_put_cq;
-
 	srq = pd->device->create_srq(pd, &attr, udata);
 	if (IS_ERR(srq)) {
 		ret = PTR_ERR(srq);
@@ -4114,9 +3465,7 @@ static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
 	atomic_set(&srq->usecnt, 0);
 
 	obj->uevent.uobject.object = srq;
-	ret = idr_add_uobj(&obj->uevent.uobject);
-	if (ret)
-		goto err_destroy;
+	obj->uevent.uobject.user_handle = cmd->user_handle;
 
 	memset(&resp, 0, sizeof resp);
 	resp.srq_handle = obj->uevent.uobject.id;
@@ -4132,44 +3481,32 @@ static int __uverbs_create_xsrq(struct ib_uverbs_file *file,
 	}
 
 	if (cmd->srq_type == IB_SRQT_XRC) {
-		put_uobj_read(xrcd_uobj);
-		put_cq_read(attr.ext.xrc.cq);
+		uobj_put_read(xrcd_uobj);
+		uobj_put_obj_read(attr.ext.xrc.cq);
 	}
-	put_pd_read(pd);
-
-	mutex_lock(&file->mutex);
-	list_add_tail(&obj->uevent.uobject.list, &file->ucontext->srq_list);
-	mutex_unlock(&file->mutex);
-
-	obj->uevent.uobject.live = 1;
-
-	up_write(&obj->uevent.uobject.mutex);
+	uobj_put_obj_read(pd);
+	uobj_alloc_commit(&obj->uevent.uobject);
 
 	return 0;
 
 err_copy:
-	idr_remove_uobj(&obj->uevent.uobject);
-
-err_destroy:
 	ib_destroy_srq(srq);
 
 err_put:
-	ib_rdmacg_uncharge(&obj->uevent.uobject.cg_obj, ib_dev,
-			   RDMACG_RESOURCE_HCA_OBJECT);
-	put_pd_read(pd);
+	uobj_put_obj_read(pd);
 
 err_put_cq:
 	if (cmd->srq_type == IB_SRQT_XRC)
-		put_cq_read(attr.ext.xrc.cq);
+		uobj_put_obj_read(attr.ext.xrc.cq);
 
 err_put_xrcd:
 	if (cmd->srq_type == IB_SRQT_XRC) {
 		atomic_dec(&obj->uxrcd->refcnt);
-		put_uobj_read(xrcd_uobj);
+		uobj_put_read(xrcd_uobj);
 	}
 
 err:
-	put_uobj_write(&obj->uevent.uobject);
+	uobj_alloc_abort(&obj->uevent.uobject);
 	return ret;
 }
 
@@ -4254,7 +3591,7 @@ ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
 	INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
 		   out_len);
 
-	srq = idr_read_srq(cmd.srq_handle, file->ucontext);
+	srq = uobj_get_obj_read(srq, cmd.srq_handle, file->ucontext);
 	if (!srq)
 		return -EINVAL;
 
@@ -4263,7 +3600,7 @@ ssize_t ib_uverbs_modify_srq(struct ib_uverbs_file *file,
 
 	ret = srq->device->modify_srq(srq, &attr, cmd.attr_mask, &udata);
 
-	put_srq_read(srq);
+	uobj_put_obj_read(srq);
 
 	return ret ? ret : in_len;
 }
@@ -4285,13 +3622,13 @@ ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	srq = idr_read_srq(cmd.srq_handle, file->ucontext);
+	srq = uobj_get_obj_read(srq, cmd.srq_handle, file->ucontext);
 	if (!srq)
 		return -EINVAL;
 
 	ret = ib_query_srq(srq, &attr);
 
-	put_srq_read(srq);
+	uobj_put_obj_read(srq);
 
 	if (ret)
 		return ret;
@@ -4320,53 +3657,39 @@ ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
 	struct ib_srq               	 *srq;
 	struct ib_uevent_object        	 *obj;
 	int                         	  ret = -EINVAL;
-	struct ib_usrq_object		 *us;
 	enum ib_srq_type		  srq_type;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj = idr_write_uobj(cmd.srq_handle, file->ucontext);
-	if (!uobj)
-		return -EINVAL;
+	uobj  = uobj_get_write(uobj_get_type(srq), cmd.srq_handle,
+			       file->ucontext);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
+
 	srq = uobj->object;
 	obj = container_of(uobj, struct ib_uevent_object, uobject);
 	srq_type = srq->srq_type;
+	/*
+	 * Make sure we don't free the memory in remove_commit as we still
+	 * needs the uobject memory to create the response.
+	 */
+	uverbs_uobject_get(uobj);
 
-	ret = ib_destroy_srq(srq);
-	if (!ret)
-		uobj->live = 0;
-
-	put_uobj_write(uobj);
+	memset(&resp, 0, sizeof(resp));
 
-	if (ret)
+	ret = uobj_remove_commit(uobj);
+	if (ret) {
+		uverbs_uobject_put(uobj);
 		return ret;
-
-	ib_rdmacg_uncharge(&uobj->cg_obj, ib_dev, RDMACG_RESOURCE_HCA_OBJECT);
-
-	if (srq_type == IB_SRQT_XRC) {
-		us = container_of(obj, struct ib_usrq_object, uevent);
-		atomic_dec(&us->uxrcd->refcnt);
 	}
-
-	idr_remove_uobj(uobj);
-
-	mutex_lock(&file->mutex);
-	list_del(&uobj->list);
-	mutex_unlock(&file->mutex);
-
-	ib_uverbs_release_uevent(file, obj);
-
-	memset(&resp, 0, sizeof resp);
 	resp.events_reported = obj->events_reported;
+	uverbs_uobject_put(uobj);
+	if (copy_to_user((void __user *)(unsigned long)cmd.response,
+			 &resp, sizeof(resp)))
+		return -EFAULT;
 
-	put_uobj(uobj);
-
-	if (copy_to_user((void __user *) (unsigned long) cmd.response,
-			 &resp, sizeof resp))
-		ret = -EFAULT;
-
-	return ret ? ret : in_len;
+	return in_len;
 }
 
 int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,