[PATCH for-next 2/3] RDMA/hns: Link all uctx to uctx_list on a device

[Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>]

From: Chengchang Tang <tangchengchang@xxxxxxxxxx>

Link all uctx to uctx_list on a device.

Signed-off-by: Chengchang Tang <tangchengchang@xxxxxxxxxx>
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
---
 drivers/infiniband/hw/hns/hns_roce_device.h |  4 ++++
 drivers/infiniband/hw/hns/hns_roce_main.c   | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index 0b1e21cb6d2d..93768660569d 100644
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -217,6 +217,7 @@ struct hns_roce_ucontext {
 	struct mutex		page_mutex;
 	struct hns_user_mmap_entry *db_mmap_entry;
 	u32			config;
+	struct list_head list; /* link all uctx to uctx_list on hr_dev */
 };
 
 struct hns_roce_pd {
@@ -1030,6 +1031,9 @@ struct hns_roce_dev {
 	u64 dwqe_page;
 	struct hns_roce_dev_debugfs dbgfs;
 	atomic64_t *dfx_cnt;
+
+	struct list_head	uctx_list; /* list of all uctx on this dev */
+	struct mutex		uctx_list_mutex; /* protect @uctx_list */
 };
 
 static inline struct hns_roce_dev *to_hr_dev(struct ib_device *ib_dev)
diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
index 4cb0af733587..e19871ebc315 100644
--- a/drivers/infiniband/hw/hns/hns_roce_main.c
+++ b/drivers/infiniband/hw/hns/hns_roce_main.c
@@ -426,6 +426,10 @@ static int hns_roce_alloc_ucontext(struct ib_ucontext *uctx,
 	if (ret)
 		goto error_fail_copy_to_udata;
 
+	mutex_lock(&hr_dev->uctx_list_mutex);
+	list_add(&context->list, &hr_dev->uctx_list);
+	mutex_unlock(&hr_dev->uctx_list_mutex);
+
 	return 0;
 
 error_fail_copy_to_udata:
@@ -448,6 +452,10 @@ static void hns_roce_dealloc_ucontext(struct ib_ucontext *ibcontext)
 	struct hns_roce_ucontext *context = to_hr_ucontext(ibcontext);
 	struct hns_roce_dev *hr_dev = to_hr_dev(ibcontext->device);
 
+	mutex_lock(&hr_dev->uctx_list_mutex);
+	list_del(&context->list);
+	mutex_unlock(&hr_dev->uctx_list_mutex);
+
 	if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_CQ_RECORD_DB ||
 	    hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_QP_RECORD_DB)
 		mutex_destroy(&context->page_mutex);
@@ -943,6 +951,7 @@ static int hns_roce_init_hem(struct hns_roce_dev *hr_dev)
 static void hns_roce_teardown_hca(struct hns_roce_dev *hr_dev)
 {
 	hns_roce_cleanup_bitmap(hr_dev);
+	mutex_destroy(&hr_dev->uctx_list_mutex);
 
 	if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_CQ_RECORD_DB ||
 	    hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_QP_RECORD_DB)
@@ -961,6 +970,9 @@ static int hns_roce_setup_hca(struct hns_roce_dev *hr_dev)
 
 	spin_lock_init(&hr_dev->sm_lock);
 
+	INIT_LIST_HEAD(&hr_dev->uctx_list);
+	mutex_init(&hr_dev->uctx_list_mutex);
+
 	if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_CQ_RECORD_DB ||
 	    hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_QP_RECORD_DB) {
 		INIT_LIST_HEAD(&hr_dev->pgdir_list);
@@ -1000,6 +1012,7 @@ static int hns_roce_setup_hca(struct hns_roce_dev *hr_dev)
 	if (hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_CQ_RECORD_DB ||
 	    hr_dev->caps.flags & HNS_ROCE_CAP_FLAG_QP_RECORD_DB)
 		mutex_destroy(&hr_dev->pgdir_mutex);
+	mutex_destroy(&hr_dev->uctx_list_mutex);
 
 	return ret;
 }
-- 
2.33.0