From: Yishai Hadas <yishaih@mellanox.com>
Date: Tue, 19 May 2020 10:27:07 +0300
Subject: IB/uverbs: Extend CQ to get its own asynchronous event FD
Patch-mainline: v5.8-rc1
Git-commit: cda9ee494248b890973f5d31cf7851c0d21755b9
References: jsc#SLE-15176

Extend CQ to get its own asynchronous event FD.
The event FD is an optional attribute, in case wasn't given the ufile
event FD will be used.

Link: https://lore.kernel.org/r/20200519072711.257271-4-leon@kernel.org
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/uverbs.h              |   18 ++++++++++++++++++
 drivers/infiniband/core/uverbs_std_types_cq.c |    9 ++++++---
 include/uapi/rdma/ib_user_ioctl_cmds.h        |    1 +
 3 files changed, 25 insertions(+), 3 deletions(-)

--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -297,6 +297,24 @@ static inline u32 make_port_cap_flags(co
 	return res;
 }
 
+static inline struct ib_uverbs_async_event_file *
+ib_uverbs_get_async_event(struct uverbs_attr_bundle *attrs,
+			  u16 id)
+{
+	struct ib_uobject *async_ev_file_uobj;
+	struct ib_uverbs_async_event_file *async_ev_file;
+
+	async_ev_file_uobj = uverbs_attr_get_uobject(attrs, id);
+	if (IS_ERR(async_ev_file_uobj))
+		async_ev_file = READ_ONCE(attrs->ufile->default_async_file);
+	else
+		async_ev_file = container_of(async_ev_file_uobj,
+				       struct ib_uverbs_async_event_file,
+				       uobj);
+	if (async_ev_file)
+		uverbs_uobject_get(&async_ev_file->uobj);
+	return async_ev_file;
+}
 
 void copy_port_attr_to_resp(struct ib_port_attr *attr,
 			    struct ib_uverbs_query_port_resp *resp,
--- a/drivers/infiniband/core/uverbs_std_types_cq.c
+++ b/drivers/infiniband/core/uverbs_std_types_cq.c
@@ -100,9 +100,8 @@ static int UVERBS_HANDLER(UVERBS_METHOD_
 		uverbs_uobject_get(ev_file_uobj);
 	}
 
-	obj->uevent.event_file = READ_ONCE(attrs->ufile->default_async_file);
-	if (obj->uevent.event_file)
-		uverbs_uobject_get(&obj->uevent.event_file->uobj);
+	obj->uevent.event_file = ib_uverbs_get_async_event(
+		attrs, UVERBS_ATTR_CREATE_CQ_EVENT_FD);
 
 	if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) {
 		ret = -EINVAL;
@@ -173,6 +172,10 @@ DECLARE_UVERBS_NAMED_METHOD(
 	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_CREATE_CQ_RESP_CQE,
 			    UVERBS_ATTR_TYPE(u32),
 			    UA_MANDATORY),
+	UVERBS_ATTR_FD(UVERBS_ATTR_CREATE_CQ_EVENT_FD,
+		       UVERBS_OBJECT_ASYNC_EVENT,
+		       UVERBS_ACCESS_READ,
+		       UA_OPTIONAL),
 	UVERBS_ATTR_UHW());
 
 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)(
--- a/include/uapi/rdma/ib_user_ioctl_cmds.h
+++ b/include/uapi/rdma/ib_user_ioctl_cmds.h
@@ -95,6 +95,7 @@ enum uverbs_attrs_create_cq_cmd_attr_ids
 	UVERBS_ATTR_CREATE_CQ_COMP_VECTOR,
 	UVERBS_ATTR_CREATE_CQ_FLAGS,
 	UVERBS_ATTR_CREATE_CQ_RESP_CQE,
+	UVERBS_ATTR_CREATE_CQ_EVENT_FD,
 };
 
 enum uverbs_attrs_destroy_cq_cmd_attr_ids {