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