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, 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, 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(nr_pages, &user->locked_vm); 145 } 146 147 #endif 148