IB/core: Introduce rdma_user_mmap_entry_insert_range() API (7a763d18) · Commits · 戴 / test

drivers/infiniband/core/ib_core_uverbs.c

+39 −9

Original line number	Diff line number	Diff line
		@@ -238,28 +238,32 @@ void rdma_user_mmap_entry_remove(struct rdma_user_mmap_entry *entry)
		EXPORT_SYMBOL(rdma_user_mmap_entry_remove);

		/**
		* rdma_user_mmap_entry_insert() - Insert an entry to the mmap_xa
		* rdma_user_mmap_entry_insert_range() - Insert an entry to the mmap_xa
		* in a given range.
		*
		* @ucontext: associated user context.
		* @entry: the entry to insert into the mmap_xa
		* @length: length of the address that will be mmapped
		* @min_pgoff: minimum pgoff to be returned
		* @max_pgoff: maximum pgoff to be returned
		*
		* This function should be called by drivers that use the rdma_user_mmap
		* interface for implementing their mmap syscall A database of mmap offsets is
		* handled in the core and helper functions are provided to insert entries
		* into the database and extract entries when the user calls mmap with the
		* given offset. The function allocates a unique page offset that should be
		* provided to user, the user will use the offset to retrieve information such
		* as address to be mapped and how.
		* given offset. The function allocates a unique page offset in a given range
		* that should be provided to user, the user will use the offset to retrieve
		* information such as address to be mapped and how.
		*
		* Return: 0 on success and -ENOMEM on failure
		*/
		int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
		int rdma_user_mmap_entry_insert_range(struct ib_ucontext *ucontext,
		struct rdma_user_mmap_entry *entry,
		size_t length)
		size_t length, u32 min_pgoff,
		u32 max_pgoff)
		{
		struct ib_uverbs_file *ufile = ucontext->ufile;
		XA_STATE(xas, &ucontext->mmap_xa, 0);
		XA_STATE(xas, &ucontext->mmap_xa, min_pgoff);
		u32 xa_first, xa_last, npages;
		int err;
		u32 i;
		@@ -285,7 +289,7 @@ int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
		entry->npages = npages;
		while (true) {
		/* First find an empty index */
		xas_find_marked(&xas, U32_MAX, XA_FREE_MARK);
		xas_find_marked(&xas, max_pgoff, XA_FREE_MARK);
		if (xas.xa_node == XAS_RESTART)
		goto err_unlock;

		@@ -332,4 +336,30 @@ err_unlock:
		mutex_unlock(&ufile->umap_lock);
		return -ENOMEM;
		}
		EXPORT_SYMBOL(rdma_user_mmap_entry_insert_range);

		/**
		* rdma_user_mmap_entry_insert() - Insert an entry to the mmap_xa.
		*
		* @ucontext: associated user context.
		* @entry: the entry to insert into the mmap_xa
		* @length: length of the address that will be mmapped
		*
		* This function should be called by drivers that use the rdma_user_mmap
		* interface for handling user mmapped addresses. The database is handled in
		* the core and helper functions are provided to insert entries into the
		* database and extract entries when the user calls mmap with the given offset.
		* The function allocates a unique page offset that should be provided to user,
		* the user will use the offset to retrieve information such as address to
		* be mapped and how.
		*
		* Return: 0 on success and -ENOMEM on failure
		*/
		int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
		struct rdma_user_mmap_entry *entry,
		size_t length)
		{
		return rdma_user_mmap_entry_insert_range(ucontext, entry, length, 0,
		U32_MAX);
		}
		EXPORT_SYMBOL(rdma_user_mmap_entry_insert);

include/rdma/ib_verbs.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -2832,6 +2832,11 @@ int rdma_user_mmap_io(struct ib_ucontext ucontext, struct vm_area_struct vma,
		int rdma_user_mmap_entry_insert(struct ib_ucontext *ucontext,
		struct rdma_user_mmap_entry *entry,
		size_t length);
		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);

		struct rdma_user_mmap_entry *
		rdma_user_mmap_entry_get_pgoff(struct ib_ucontext *ucontext,
		unsigned long pgoff);

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