1// SPDX-License-Identifier: GPL-2.0
2#ifndef IOU_RSRC_H
3#define IOU_RSRC_H
4
5#define IO_NODE_ALLOC_CACHE_MAX 32
6
7#define IO_RSRC_TAG_TABLE_SHIFT	(PAGE_SHIFT - 3)
8#define IO_RSRC_TAG_TABLE_MAX	(1U << IO_RSRC_TAG_TABLE_SHIFT)
9#define IO_RSRC_TAG_TABLE_MASK	(IO_RSRC_TAG_TABLE_MAX - 1)
10
11enum {
12	IORING_RSRC_FILE		= 0,
13	IORING_RSRC_BUFFER		= 1,
14};
15
16struct io_rsrc_put {
17	u64 tag;
18	union {
19		void *rsrc;
20		struct file *file;
21		struct io_mapped_ubuf *buf;
22	};
23};
24
25typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
26
27struct io_rsrc_data {
28	struct io_ring_ctx		*ctx;
29
30	u64				**tags;
31	unsigned int			nr;
32	u16				rsrc_type;
33	bool				quiesce;
34};
35
36struct io_rsrc_node {
37	struct io_ring_ctx		*ctx;
38	int				refs;
39	bool				empty;
40	u16				type;
41	struct list_head		node;
42	struct io_rsrc_put		item;
43};
44
45struct io_mapped_ubuf {
46	u64		ubuf;
47	u64		ubuf_end;
48	unsigned int	nr_bvecs;
49	unsigned long	acct_pages;
50	struct bio_vec	bvec[] __counted_by(nr_bvecs);
51};
52
53void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
54void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
55struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
56int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
57
58int io_import_fixed(int ddir, struct iov_iter *iter,
59			   struct io_mapped_ubuf *imu,
60			   u64 buf_addr, size_t len);
61
62void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
63int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
64int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
65			    unsigned int nr_args, u64 __user *tags);
66void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
67int io_sqe_files_unregister(struct io_ring_ctx *ctx);
68int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
69			  unsigned nr_args, u64 __user *tags);
70
71int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
72			     unsigned nr_args);
73int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
74			    unsigned size, unsigned type);
75int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
76			unsigned int size, unsigned int type);
77
78static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
79{
80	lockdep_assert_held(&ctx->uring_lock);
81
82	if (node && !--node->refs)
83		io_rsrc_node_ref_zero(node);
84}
85
86static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
87				       struct io_rsrc_node *node)
88{
89	node->refs++;
90}
91
92static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
93					  struct io_ring_ctx *ctx)
94{
95	lockdep_assert_held(&ctx->uring_lock);
96	req->rsrc_node = ctx->rsrc_node;
97	io_charge_rsrc_node(ctx, ctx->rsrc_node);
98}
99
100static inline void io_req_set_rsrc_node(struct io_kiocb *req,
101					struct io_ring_ctx *ctx,
102					unsigned int issue_flags)
103{
104	if (!req->rsrc_node) {
105		io_ring_submit_lock(ctx, issue_flags);
106		__io_req_set_rsrc_node(req, ctx);
107		io_ring_submit_unlock(ctx, issue_flags);
108	}
109}
110
111static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
112{
113	unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
114	unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
115
116	return &data->tags[table_idx][off];
117}
118
119static inline int io_rsrc_init(struct io_ring_ctx *ctx)
120{
121	ctx->rsrc_node = io_rsrc_node_alloc(ctx);
122	return ctx->rsrc_node ? 0 : -ENOMEM;
123}
124
125int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
126int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
127
128int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
129
130static inline void __io_unaccount_mem(struct user_struct *user,
131				      unsigned long nr_pages)
132{
133	atomic_long_sub(nr_pages, &user->locked_vm);
134}
135
136#endif
137