1// SPDX-License-Identifier: GPL-2.0
2#ifndef IOU_RSRC_H
3#define IOU_RSRC_H
4
5#include "alloc_cache.h"
6
7#define IO_NODE_ALLOC_CACHE_MAX 32
8
9#define IO_RSRC_TAG_TABLE_SHIFT	(PAGE_SHIFT - 3)
10#define IO_RSRC_TAG_TABLE_MAX	(1U << IO_RSRC_TAG_TABLE_SHIFT)
11#define IO_RSRC_TAG_TABLE_MASK	(IO_RSRC_TAG_TABLE_MAX - 1)
12
13enum {
14	IORING_RSRC_FILE		= 0,
15	IORING_RSRC_BUFFER		= 1,
16};
17
18struct io_rsrc_put {
19	u64 tag;
20	union {
21		void *rsrc;
22		struct file *file;
23		struct io_mapped_ubuf *buf;
24	};
25};
26
27typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc);
28
29struct io_rsrc_data {
30	struct io_ring_ctx		*ctx;
31
32	u64				**tags;
33	unsigned int			nr;
34	u16				rsrc_type;
35	bool				quiesce;
36};
37
38struct io_rsrc_node {
39	union {
40		struct io_cache_entry		cache;
41		struct io_ring_ctx		*ctx;
42	};
43	int				refs;
44	bool				empty;
45	u16				type;
46	struct list_head		node;
47	struct io_rsrc_put		item;
48};
49
50struct io_mapped_ubuf {
51	u64		ubuf;
52	u64		ubuf_end;
53	unsigned int	nr_bvecs;
54	unsigned long	acct_pages;
55	struct bio_vec	bvec[] __counted_by(nr_bvecs);
56};
57
58void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
59void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
60struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
61int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
62
63int io_import_fixed(int ddir, struct iov_iter *iter,
64			   struct io_mapped_ubuf *imu,
65			   u64 buf_addr, size_t len);
66
67void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
68int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
69int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
70			    unsigned int nr_args, u64 __user *tags);
71void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
72int io_sqe_files_unregister(struct io_ring_ctx *ctx);
73int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
74			  unsigned nr_args, u64 __user *tags);
75
76int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
77			     unsigned nr_args);
78int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
79			    unsigned size, unsigned type);
80int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
81			unsigned int size, unsigned int type);
82
83static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
84{
85	lockdep_assert_held(&ctx->uring_lock);
86
87	if (node && !--node->refs)
88		io_rsrc_node_ref_zero(node);
89}
90
91static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
92					  struct io_ring_ctx *ctx)
93{
94	io_put_rsrc_node(ctx, req->rsrc_node);
95}
96
97static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
98				       struct io_rsrc_node *node)
99{
100	node->refs++;
101}
102
103static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
104					  struct io_ring_ctx *ctx)
105{
106	lockdep_assert_held(&ctx->uring_lock);
107	req->rsrc_node = ctx->rsrc_node;
108	io_charge_rsrc_node(ctx, ctx->rsrc_node);
109}
110
111static inline void io_req_set_rsrc_node(struct io_kiocb *req,
112					struct io_ring_ctx *ctx,
113					unsigned int issue_flags)
114{
115	if (!req->rsrc_node) {
116		io_ring_submit_lock(ctx, issue_flags);
117		__io_req_set_rsrc_node(req, ctx);
118		io_ring_submit_unlock(ctx, issue_flags);
119	}
120}
121
122static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
123{
124	unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
125	unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
126
127	return &data->tags[table_idx][off];
128}
129
130static inline int io_rsrc_init(struct io_ring_ctx *ctx)
131{
132	ctx->rsrc_node = io_rsrc_node_alloc(ctx);
133	return ctx->rsrc_node ? 0 : -ENOMEM;
134}
135
136int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
137int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
138
139int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
140
141static inline void __io_unaccount_mem(struct user_struct *user,
142				      unsigned long nr_pages)
143{
144	atomic_long_sub(nr_pages, &user->locked_vm);
145}
146
147#endif
148