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 | |
13 | enum { |
14 | IORING_RSRC_FILE = 0, |
15 | IORING_RSRC_BUFFER = 1, |
16 | }; |
17 | |
18 | struct io_rsrc_put { |
19 | u64 tag; |
20 | union { |
21 | void *rsrc; |
22 | struct file *file; |
23 | struct io_mapped_ubuf *buf; |
24 | }; |
25 | }; |
26 | |
27 | typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); |
28 | |
29 | struct 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 | |
38 | struct 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 | |
50 | struct 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 | |
58 | void io_rsrc_node_ref_zero(struct io_rsrc_node *node); |
59 | void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node); |
60 | struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx); |
61 | int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc); |
62 | |
63 | int io_import_fixed(int ddir, struct iov_iter *iter, |
64 | struct io_mapped_ubuf *imu, |
65 | u64 buf_addr, size_t len); |
66 | |
67 | void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
68 | int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); |
69 | int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, |
70 | unsigned int nr_args, u64 __user *tags); |
71 | void __io_sqe_files_unregister(struct io_ring_ctx *ctx); |
72 | int io_sqe_files_unregister(struct io_ring_ctx *ctx); |
73 | int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, |
74 | unsigned nr_args, u64 __user *tags); |
75 | |
76 | int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, |
77 | unsigned nr_args); |
78 | int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, |
79 | unsigned size, unsigned type); |
80 | int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, |
81 | unsigned int size, unsigned int type); |
82 | |
83 | static 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 | |
91 | static inline void io_req_put_rsrc_locked(struct io_kiocb *req, |
92 | struct io_ring_ctx *ctx) |
93 | { |
94 | io_put_rsrc_node(ctx, node: req->rsrc_node); |
95 | } |
96 | |
97 | static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx, |
98 | struct io_rsrc_node *node) |
99 | { |
100 | node->refs++; |
101 | } |
102 | |
103 | static 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, node: ctx->rsrc_node); |
109 | } |
110 | |
111 | static 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 | |
122 | static 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 | |
130 | static 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 | |
136 | int io_files_update(struct io_kiocb *req, unsigned int issue_flags); |
137 | int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); |
138 | |
139 | int __io_account_mem(struct user_struct *user, unsigned long nr_pages); |
140 | |
141 | static inline void __io_unaccount_mem(struct user_struct *user, |
142 | unsigned long nr_pages) |
143 | { |
144 | atomic_long_sub(i: nr_pages, v: &user->locked_vm); |
145 | } |
146 | |
147 | #endif |
148 | |