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 11 enum { 12 IORING_RSRC_FILE = 0, 13 IORING_RSRC_BUFFER = 1, 14 }; 15 16 struct io_rsrc_put { 17 u64 tag; 18 union { 19 void *rsrc; 20 struct file *file; 21 struct io_mapped_ubuf *buf; 22 }; 23 }; 24 25 typedef void (rsrc_put_fn)(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc); 26 27 struct 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 36 struct 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 45 struct 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 53 void io_rsrc_node_ref_zero(struct io_rsrc_node *node); 54 void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node); 55 struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx); 56 int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc); 57 58 int io_import_fixed(int ddir, struct iov_iter *iter, 59 struct io_mapped_ubuf *imu, 60 u64 buf_addr, size_t len); 61 62 void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 63 int io_sqe_buffers_unregister(struct io_ring_ctx *ctx); 64 int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg, 65 unsigned int nr_args, u64 __user *tags); 66 void __io_sqe_files_unregister(struct io_ring_ctx *ctx); 67 int io_sqe_files_unregister(struct io_ring_ctx *ctx); 68 int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg, 69 unsigned nr_args, u64 __user *tags); 70 71 int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg, 72 unsigned nr_args); 73 int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg, 74 unsigned size, unsigned type); 75 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg, 76 unsigned int size, unsigned int type); 77 78 static 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 86 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx, 87 struct io_rsrc_node *node) 88 { 89 node->refs++; 90 } 91 92 static 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 } 99 100 static 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 } 110 111 static 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 } 118 119 static 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 } 124 125 int io_files_update(struct io_kiocb *req, unsigned int issue_flags); 126 int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe); 127 128 int __io_account_mem(struct user_struct *user, unsigned long nr_pages); 129 130 static 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