From: Chengchang Tang <tangchengchang@xxxxxxxxxx>
Provide a new api rdma_user_mmap_disassociate() for drivers to
disassociate mmap pages for ucontext.
Signed-off-by: Chengchang Tang <tangchengchang@xxxxxxxxxx>
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
---
drivers/infiniband/core/uverbs_main.c | 21 +++++++++++++++++++++
include/rdma/ib_verbs.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index bc099287de9a..00dab5bfb78c 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -880,6 +880,27 @@ void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
}
}
+/**
+ * rdma_user_mmap_disassociate() - disassociate the mmap from the ucontext.
+ *
+ * @ucontext: associated user context.
+ *
+ * This function should be called by drivers that need to disable mmap for
+ * some ucontexts.
+ */
+void rdma_user_mmap_disassociate(struct ib_ucontext *ucontext)
+{
+ struct ib_uverbs_file *ufile = ucontext->ufile;
+
+ /* Racing with uverbs_destroy_ufile_hw */
+ if (!down_read_trylock(&ufile->hw_destroy_rwsem))
+ return;
+
+ uverbs_user_mmap_disassociate(ufile);
+ up_read(&ufile->hw_destroy_rwsem);
+}
+EXPORT_SYMBOL(rdma_user_mmap_disassociate);
+
/*
* ib_uverbs_open() does not need the BKL:
*
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index a1dcf812d787..d6e34ca5c727 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2947,6 +2947,7 @@ int rdma_user_mmap_entry_insert_range(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,
size_t length, u32 min_pgoff,
u32 max_pgoff);
+void rdma_user_mmap_disassociate(struct ib_ucontext *ucontext);
static inline int
rdma_user_mmap_entry_insert_exact(struct ib_ucontext *ucontext,
--
2.33.0
