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Linux kernel mirror (for testing)
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linux
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
25struct io_rsrc_data {
26 struct io_ring_ctx *ctx;
27
28 u64 **tags;
29 unsigned int nr;
30 u16 rsrc_type;
31 bool quiesce;
32};
33
34struct io_rsrc_node {
35 struct io_ring_ctx *ctx;
36 int refs;
37 bool empty;
38 u16 type;
39 struct list_head node;
40 struct io_rsrc_put item;
41};
42
43struct io_mapped_ubuf {
44 u64 ubuf;
45 unsigned int len;
46 unsigned int nr_bvecs;
47 unsigned int folio_shift;
48 refcount_t refs;
49 unsigned long acct_pages;
50 struct bio_vec bvec[] __counted_by(nr_bvecs);
51};
52
53struct io_imu_folio_data {
54 /* Head folio can be partially included in the fixed buf */
55 unsigned int nr_pages_head;
56 /* For non-head/tail folios, has to be fully included */
57 unsigned int nr_pages_mid;
58 unsigned int folio_shift;
59};
60
61void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
62void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
63struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
64int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
65
66int io_import_fixed(int ddir, struct iov_iter *iter,
67 struct io_mapped_ubuf *imu,
68 u64 buf_addr, size_t len);
69
70int io_register_clone_buffers(struct io_ring_ctx *ctx, void __user *arg);
71void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
72int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
73int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
74 unsigned int nr_args, u64 __user *tags);
75void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
76int io_sqe_files_unregister(struct io_ring_ctx *ctx);
77int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
78 unsigned nr_args, u64 __user *tags);
79
80int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
81 unsigned nr_args);
82int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
83 unsigned size, unsigned type);
84int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
85 unsigned int size, unsigned int type);
86
87static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
88{
89 lockdep_assert_held(&ctx->uring_lock);
90
91 if (node && !--node->refs)
92 io_rsrc_node_ref_zero(node);
93}
94
95static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
96 struct io_rsrc_node *node)
97{
98 node->refs++;
99}
100
101static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
102 struct io_ring_ctx *ctx)
103{
104 lockdep_assert_held(&ctx->uring_lock);
105 req->rsrc_node = ctx->rsrc_node;
106 io_charge_rsrc_node(ctx, ctx->rsrc_node);
107}
108
109static inline void io_req_set_rsrc_node(struct io_kiocb *req,
110 struct io_ring_ctx *ctx,
111 unsigned int issue_flags)
112{
113 if (!req->rsrc_node) {
114 io_ring_submit_lock(ctx, issue_flags);
115 __io_req_set_rsrc_node(req, ctx);
116 io_ring_submit_unlock(ctx, issue_flags);
117 }
118}
119
120static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
121{
122 unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
123 unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
124
125 return &data->tags[table_idx][off];
126}
127
128static inline int io_rsrc_init(struct io_ring_ctx *ctx)
129{
130 ctx->rsrc_node = io_rsrc_node_alloc(ctx);
131 return ctx->rsrc_node ? 0 : -ENOMEM;
132}
133
134int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
135int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
136
137int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
138
139static inline void __io_unaccount_mem(struct user_struct *user,
140 unsigned long nr_pages)
141{
142 atomic_long_sub(nr_pages, &user->locked_vm);
143}
144
145#endif