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// SPDX-License-Identifier: GPL-2.0
#ifndef IOU_RSRC_H
#define IOU_RSRC_H
#define IO_NODE_ALLOC_CACHE_MAX 32
#define IO_RSRC_TAG_TABLE_SHIFT (PAGE_SHIFT - 3)
#define IO_RSRC_TAG_TABLE_MAX (1U << IO_RSRC_TAG_TABLE_SHIFT)
#define IO_RSRC_TAG_TABLE_MASK (IO_RSRC_TAG_TABLE_MAX - 1)
enum {
IORING_RSRC_FILE = 0,
IORING_RSRC_BUFFER = 1,
};
struct io_rsrc_put {
u64 tag;
union {
void *rsrc;
struct file *file;
struct io_mapped_ubuf *buf;
};
};
struct io_rsrc_data {
struct io_ring_ctx *ctx;
u64 **tags;
unsigned int nr;
u16 rsrc_type;
bool quiesce;
};
struct io_rsrc_node {
struct io_ring_ctx *ctx;
int refs;
bool empty;
u16 type;
struct list_head node;
struct io_rsrc_put item;
};
struct io_mapped_ubuf {
u64 ubuf;
u64 ubuf_end;
unsigned int nr_bvecs;
unsigned int folio_shift;
unsigned long acct_pages;
unsigned long folio_mask;
struct bio_vec bvec[] __counted_by(nr_bvecs);
};
struct io_imu_folio_data {
/* Head folio can be partially included in the fixed buf */
unsigned int nr_pages_head;
/* For non-head/tail folios, has to be fully included */
unsigned int nr_pages_mid;
unsigned int folio_shift;
};
void io_rsrc_node_ref_zero(struct io_rsrc_node *node);
void io_rsrc_node_destroy(struct io_ring_ctx *ctx, struct io_rsrc_node *ref_node);
struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx);
int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, void *rsrc);
int io_import_fixed(int ddir, struct iov_iter *iter,
struct io_mapped_ubuf *imu,
u64 buf_addr, size_t len);
void __io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
int io_sqe_buffers_unregister(struct io_ring_ctx *ctx);
int io_sqe_buffers_register(struct io_ring_ctx *ctx, void __user *arg,
unsigned int nr_args, u64 __user *tags);
void __io_sqe_files_unregister(struct io_ring_ctx *ctx);
int io_sqe_files_unregister(struct io_ring_ctx *ctx);
int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
unsigned nr_args, u64 __user *tags);
int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
unsigned nr_args);
int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
unsigned size, unsigned type);
int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
unsigned int size, unsigned int type);
static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
{
lockdep_assert_held(&ctx->uring_lock);
if (node && !--node->refs)
io_rsrc_node_ref_zero(node);
}
static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
struct io_rsrc_node *node)
{
node->refs++;
}
static inline void __io_req_set_rsrc_node(struct io_kiocb *req,
struct io_ring_ctx *ctx)
{
lockdep_assert_held(&ctx->uring_lock);
req->rsrc_node = ctx->rsrc_node;
io_charge_rsrc_node(ctx, ctx->rsrc_node);
}
static inline void io_req_set_rsrc_node(struct io_kiocb *req,
struct io_ring_ctx *ctx,
unsigned int issue_flags)
{
if (!req->rsrc_node) {
io_ring_submit_lock(ctx, issue_flags);
__io_req_set_rsrc_node(req, ctx);
io_ring_submit_unlock(ctx, issue_flags);
}
}
static inline u64 *io_get_tag_slot(struct io_rsrc_data *data, unsigned int idx)
{
unsigned int off = idx & IO_RSRC_TAG_TABLE_MASK;
unsigned int table_idx = idx >> IO_RSRC_TAG_TABLE_SHIFT;
return &data->tags[table_idx][off];
}
static inline int io_rsrc_init(struct io_ring_ctx *ctx)
{
ctx->rsrc_node = io_rsrc_node_alloc(ctx);
return ctx->rsrc_node ? 0 : -ENOMEM;
}
int io_files_update(struct io_kiocb *req, unsigned int issue_flags);
int io_files_update_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int __io_account_mem(struct user_struct *user, unsigned long nr_pages);
static inline void __io_unaccount_mem(struct user_struct *user,
unsigned long nr_pages)
{
atomic_long_sub(nr_pages, &user->locked_vm);
}
#endif
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