183 lines · c
1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright (C) 2017 Google, Inc.4 */5 6#ifndef _LINUX_BINDER_ALLOC_H7#define _LINUX_BINDER_ALLOC_H8 9#include <linux/rbtree.h>10#include <linux/list.h>11#include <linux/mm.h>12#include <linux/spinlock.h>13#include <linux/vmalloc.h>14#include <linux/slab.h>15#include <linux/list_lru.h>16#include <uapi/linux/android/binder.h>17 18extern struct list_lru binder_freelist;19struct binder_transaction;20 21/**22 * struct binder_buffer - buffer used for binder transactions23 * @entry: entry alloc->buffers24 * @rb_node: node for allocated_buffers/free_buffers rb trees25 * @free: %true if buffer is free26 * @clear_on_free: %true if buffer must be zeroed after use27 * @allow_user_free: %true if user is allowed to free buffer28 * @async_transaction: %true if buffer is in use for an async txn29 * @oneway_spam_suspect: %true if total async allocate size just exceed30 * spamming detect threshold31 * @debug_id: unique ID for debugging32 * @transaction: pointer to associated struct binder_transaction33 * @target_node: struct binder_node associated with this buffer34 * @data_size: size of @transaction data35 * @offsets_size: size of array of offsets36 * @extra_buffers_size: size of space for other objects (like sg lists)37 * @user_data: user pointer to base of buffer space38 * @pid: pid to attribute the buffer to (caller)39 *40 * Bookkeeping structure for binder transaction buffers41 */42struct binder_buffer {43 struct list_head entry; /* free and allocated entries by address */44 struct rb_node rb_node; /* free entry by size or allocated entry */45 /* by address */46 unsigned free:1;47 unsigned clear_on_free:1;48 unsigned allow_user_free:1;49 unsigned async_transaction:1;50 unsigned oneway_spam_suspect:1;51 unsigned debug_id:27;52 struct binder_transaction *transaction;53 struct binder_node *target_node;54 size_t data_size;55 size_t offsets_size;56 size_t extra_buffers_size;57 unsigned long user_data;58 int pid;59};60 61/**62 * struct binder_lru_page - page object used for binder shrinker63 * @page_ptr: pointer to physical page in mmap'd space64 * @lru: entry in binder_freelist65 * @alloc: binder_alloc for a proc66 */67struct binder_lru_page {68 struct list_head lru;69 struct page *page_ptr;70 struct binder_alloc *alloc;71};72 73/**74 * struct binder_alloc - per-binder proc state for binder allocator75 * @lock: protects binder_alloc fields76 * @vma: vm_area_struct passed to mmap_handler77 * (invariant after mmap)78 * @mm: copy of task->mm (invariant after open)79 * @buffer: base of per-proc address space mapped via mmap80 * @buffers: list of all buffers for this proc81 * @free_buffers: rb tree of buffers available for allocation82 * sorted by size83 * @allocated_buffers: rb tree of allocated buffers sorted by address84 * @free_async_space: VA space available for async buffers. This is85 * initialized at mmap time to 1/2 the full VA space86 * @pages: array of binder_lru_page87 * @buffer_size: size of address space specified via mmap88 * @pid: pid for associated binder_proc (invariant after init)89 * @pages_high: high watermark of offset in @pages90 * @oneway_spam_detected: %true if oneway spam detection fired, clear that91 * flag once the async buffer has returned to a healthy state92 *93 * Bookkeeping structure for per-proc address space management for binder94 * buffers. It is normally initialized during binder_init() and binder_mmap()95 * calls. The address space is used for both user-visible buffers and for96 * struct binder_buffer objects used to track the user buffers97 */98struct binder_alloc {99 spinlock_t lock;100 struct vm_area_struct *vma;101 struct mm_struct *mm;102 unsigned long buffer;103 struct list_head buffers;104 struct rb_root free_buffers;105 struct rb_root allocated_buffers;106 size_t free_async_space;107 struct binder_lru_page *pages;108 size_t buffer_size;109 int pid;110 size_t pages_high;111 bool oneway_spam_detected;112};113 114#ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST115void binder_selftest_alloc(struct binder_alloc *alloc);116#else117static inline void binder_selftest_alloc(struct binder_alloc *alloc) {}118#endif119enum lru_status binder_alloc_free_page(struct list_head *item,120 struct list_lru_one *lru,121 spinlock_t *lock, void *cb_arg);122struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc,123 size_t data_size,124 size_t offsets_size,125 size_t extra_buffers_size,126 int is_async);127void binder_alloc_init(struct binder_alloc *alloc);128int binder_alloc_shrinker_init(void);129void binder_alloc_shrinker_exit(void);130void binder_alloc_vma_close(struct binder_alloc *alloc);131struct binder_buffer *132binder_alloc_prepare_to_free(struct binder_alloc *alloc,133 unsigned long user_ptr);134void binder_alloc_free_buf(struct binder_alloc *alloc,135 struct binder_buffer *buffer);136int binder_alloc_mmap_handler(struct binder_alloc *alloc,137 struct vm_area_struct *vma);138void binder_alloc_deferred_release(struct binder_alloc *alloc);139int binder_alloc_get_allocated_count(struct binder_alloc *alloc);140void binder_alloc_print_allocated(struct seq_file *m,141 struct binder_alloc *alloc);142void binder_alloc_print_pages(struct seq_file *m,143 struct binder_alloc *alloc);144 145/**146 * binder_alloc_get_free_async_space() - get free space available for async147 * @alloc: binder_alloc for this proc148 *149 * Return: the bytes remaining in the address-space for async transactions150 */151static inline size_t152binder_alloc_get_free_async_space(struct binder_alloc *alloc)153{154 size_t free_async_space;155 156 spin_lock(&alloc->lock);157 free_async_space = alloc->free_async_space;158 spin_unlock(&alloc->lock);159 return free_async_space;160}161 162unsigned long163binder_alloc_copy_user_to_buffer(struct binder_alloc *alloc,164 struct binder_buffer *buffer,165 binder_size_t buffer_offset,166 const void __user *from,167 size_t bytes);168 169int binder_alloc_copy_to_buffer(struct binder_alloc *alloc,170 struct binder_buffer *buffer,171 binder_size_t buffer_offset,172 void *src,173 size_t bytes);174 175int binder_alloc_copy_from_buffer(struct binder_alloc *alloc,176 void *dest,177 struct binder_buffer *buffer,178 binder_size_t buffer_offset,179 size_t bytes);180 181#endif /* _LINUX_BINDER_ALLOC_H */182 183