146 lines · c
1// SPDX-License-Identifier: GPL-2.02#ifndef IOU_RSRC_H3#define IOU_RSRC_H4 5#define IO_NODE_ALLOC_CACHE_MAX 326 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) HWJS_SUSPENDS;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) HWJS_SUSPENDS;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) HWJS_SUSPENDS;71void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);72int io_sqe_buffers_unregister(struct io_ring_ctx *ctx) HWJS_SUSPENDS;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) HWJS_SUSPENDS;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) HWJS_SUSPENDS;82int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,83 unsigned size, unsigned type) HWJS_SUSPENDS;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) HWJS_SUSPENDS;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#endif146