/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2017 Google, Inc. */ #ifndef _LINUX_BINDER_ALLOC_H #define _LINUX_BINDER_ALLOC_H #include <linux/rbtree.h> #include <linux/list.h> #include <linux/mm.h> #include <linux/spinlock.h> #include <linux/vmalloc.h> #include <linux/slab.h> #include <linux/list_lru.h> #include <uapi/linux/android/binder.h> extern struct list_lru binder_freelist; struct binder_transaction; /** * struct binder_buffer - buffer used for binder transactions * @entry: entry alloc->buffers * @rb_node: node for allocated_buffers/free_buffers rb trees * @free: %true if buffer is free * @clear_on_free: %true if buffer must be zeroed after use * @allow_user_free: %true if user is allowed to free buffer * @async_transaction: %true if buffer is in use for an async txn * @oneway_spam_suspect: %true if total async allocate size just exceed * spamming detect threshold * @debug_id: unique ID for debugging * @transaction: pointer to associated struct binder_transaction * @target_node: struct binder_node associated with this buffer * @data_size: size of @transaction data * @offsets_size: size of array of offsets * @extra_buffers_size: size of space for other objects (like sg lists) * @user_data: user pointer to base of buffer space * @pid: pid to attribute the buffer to (caller) * * Bookkeeping structure for binder transaction buffers */ struct binder_buffer { … }; /** * struct binder_lru_page - page object used for binder shrinker * @page_ptr: pointer to physical page in mmap'd space * @lru: entry in binder_freelist * @alloc: binder_alloc for a proc */ struct binder_lru_page { … }; /** * struct binder_alloc - per-binder proc state for binder allocator * @lock: protects binder_alloc fields * @vma: vm_area_struct passed to mmap_handler * (invariant after mmap) * @mm: copy of task->mm (invariant after open) * @buffer: base of per-proc address space mapped via mmap * @buffers: list of all buffers for this proc * @free_buffers: rb tree of buffers available for allocation * sorted by size * @allocated_buffers: rb tree of allocated buffers sorted by address * @free_async_space: VA space available for async buffers. This is * initialized at mmap time to 1/2 the full VA space * @pages: array of binder_lru_page * @buffer_size: size of address space specified via mmap * @pid: pid for associated binder_proc (invariant after init) * @pages_high: high watermark of offset in @pages * @oneway_spam_detected: %true if oneway spam detection fired, clear that * flag once the async buffer has returned to a healthy state * * Bookkeeping structure for per-proc address space management for binder * buffers. It is normally initialized during binder_init() and binder_mmap() * calls. The address space is used for both user-visible buffers and for * struct binder_buffer objects used to track the user buffers */ struct binder_alloc { … }; #ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST void binder_selftest_alloc(struct binder_alloc *alloc); #else static inline void binder_selftest_alloc(struct binder_alloc *alloc) {} #endif enum lru_status binder_alloc_free_page(struct list_head *item, struct list_lru_one *lru, spinlock_t *lock, void *cb_arg); struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc, size_t data_size, size_t offsets_size, size_t extra_buffers_size, int is_async); void binder_alloc_init(struct binder_alloc *alloc); int binder_alloc_shrinker_init(void); void binder_alloc_shrinker_exit(void); void binder_alloc_vma_close(struct binder_alloc *alloc); struct binder_buffer * binder_alloc_prepare_to_free(struct binder_alloc *alloc, unsigned long user_ptr); void binder_alloc_free_buf(struct binder_alloc *alloc, struct binder_buffer *buffer); int binder_alloc_mmap_handler(struct binder_alloc *alloc, struct vm_area_struct *vma); void binder_alloc_deferred_release(struct binder_alloc *alloc); int binder_alloc_get_allocated_count(struct binder_alloc *alloc); void binder_alloc_print_allocated(struct seq_file *m, struct binder_alloc *alloc); void binder_alloc_print_pages(struct seq_file *m, struct binder_alloc *alloc); /** * binder_alloc_get_free_async_space() - get free space available for async * @alloc: binder_alloc for this proc * * Return: the bytes remaining in the address-space for async transactions */ static inline size_t binder_alloc_get_free_async_space(struct binder_alloc *alloc) { … } unsigned long binder_alloc_copy_user_to_buffer(struct binder_alloc *alloc, struct binder_buffer *buffer, binder_size_t buffer_offset, const void __user *from, size_t bytes); int binder_alloc_copy_to_buffer(struct binder_alloc *alloc, struct binder_buffer *buffer, binder_size_t buffer_offset, void *src, size_t bytes); int binder_alloc_copy_from_buffer(struct binder_alloc *alloc, void *dest, struct binder_buffer *buffer, binder_size_t buffer_offset, size_t bytes); #endif /* _LINUX_BINDER_ALLOC_H */
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