189 lines
6.6 KiB
C
189 lines
6.6 KiB
C
/*
|
|
* Copyright (C) 2017 Google, Inc.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_BINDER_ALLOC_H
|
|
#define _LINUX_BINDER_ALLOC_H
|
|
|
|
#include <linux/rbtree.h>
|
|
#include <linux/list.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/rtmutex.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/list_lru.h>
|
|
|
|
extern struct list_lru binder_alloc_lru;
|
|
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
|
|
* @allow_user_free: describe the second member of struct blah,
|
|
* @async_transaction: describe the second member of struct blah,
|
|
* @debug_id: describe the second member of struct blah,
|
|
* @transaction: describe the second member of struct blah,
|
|
* @target_node: describe the second member of struct blah,
|
|
* @data_size: describe the second member of struct blah,
|
|
* @offsets_size: describe the second member of struct blah,
|
|
* @extra_buffers_size: describe the second member of struct blah,
|
|
* @data:i describe the second member of struct blah,
|
|
*
|
|
* Bookkeeping structure for binder transaction buffers
|
|
*/
|
|
struct binder_buffer {
|
|
struct list_head entry; /* free and allocated entries by address */
|
|
struct rb_node rb_node; /* free entry by size or allocated entry */
|
|
/* by address */
|
|
unsigned free:1;
|
|
unsigned allow_user_free:1;
|
|
unsigned async_transaction:1;
|
|
unsigned free_in_progress:1;
|
|
unsigned debug_id:28;
|
|
|
|
struct binder_transaction *transaction;
|
|
|
|
struct binder_node *target_node;
|
|
size_t data_size;
|
|
size_t offsets_size;
|
|
size_t extra_buffers_size;
|
|
void *data;
|
|
};
|
|
|
|
/**
|
|
* struct binder_lru_page - page object used for binder shrinker
|
|
* @page_ptr: pointer to physical page in mmap'd space
|
|
* @lru: entry in binder_alloc_lru
|
|
* @alloc: binder_alloc for a proc
|
|
*/
|
|
struct binder_lru_page {
|
|
struct list_head lru;
|
|
struct page *page_ptr;
|
|
struct binder_alloc *alloc;
|
|
};
|
|
|
|
/**
|
|
* struct binder_alloc - per-binder proc state for binder allocator
|
|
* @vma: vm_area_struct passed to mmap_handler
|
|
* (invarient after mmap)
|
|
* @tsk: tid for task that called init for this proc
|
|
* (invariant after init)
|
|
* @vma_vm_mm: copy of vma->vm_mm (invarient after mmap)
|
|
* @buffer: base of per-proc address space mapped via mmap
|
|
* @user_buffer_offset: offset between user and kernel VAs for buffer
|
|
* @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
|
|
*
|
|
* 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 {
|
|
struct mutex mutex;
|
|
struct vm_area_struct *vma;
|
|
struct mm_struct *vma_vm_mm;
|
|
void *buffer;
|
|
ptrdiff_t user_buffer_offset;
|
|
struct list_head buffers;
|
|
struct rb_root free_buffers;
|
|
struct rb_root allocated_buffers;
|
|
size_t free_async_space;
|
|
struct binder_lru_page *pages;
|
|
size_t buffer_size;
|
|
uint32_t buffer_free;
|
|
int pid;
|
|
size_t pages_high;
|
|
};
|
|
|
|
#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);
|
|
extern 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);
|
|
extern void binder_alloc_init(struct binder_alloc *alloc);
|
|
extern int binder_alloc_shrinker_init(void);
|
|
extern void binder_alloc_vma_close(struct binder_alloc *alloc);
|
|
extern struct binder_buffer *
|
|
binder_alloc_prepare_to_free(struct binder_alloc *alloc,
|
|
uintptr_t user_ptr);
|
|
extern void binder_alloc_free_buf(struct binder_alloc *alloc,
|
|
struct binder_buffer *buffer);
|
|
extern int binder_alloc_mmap_handler(struct binder_alloc *alloc,
|
|
struct vm_area_struct *vma);
|
|
extern void binder_alloc_deferred_release(struct binder_alloc *alloc);
|
|
extern int binder_alloc_get_allocated_count(struct binder_alloc *alloc);
|
|
extern 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)
|
|
{
|
|
size_t free_async_space;
|
|
|
|
mutex_lock(&alloc->mutex);
|
|
free_async_space = alloc->free_async_space;
|
|
mutex_unlock(&alloc->mutex);
|
|
return free_async_space;
|
|
}
|
|
|
|
/**
|
|
* binder_alloc_get_user_buffer_offset() - get offset between kernel/user addrs
|
|
* @alloc: binder_alloc for this proc
|
|
*
|
|
* Return: the offset between kernel and user-space addresses to use for
|
|
* virtual address conversion
|
|
*/
|
|
static inline ptrdiff_t
|
|
binder_alloc_get_user_buffer_offset(struct binder_alloc *alloc)
|
|
{
|
|
/*
|
|
* user_buffer_offset is constant if vma is set and
|
|
* undefined if vma is not set. It is possible to
|
|
* get here with !alloc->vma if the target process
|
|
* is dying while a transaction is being initiated.
|
|
* Returning the old value is ok in this case and
|
|
* the transaction will fail.
|
|
*/
|
|
return alloc->user_buffer_offset;
|
|
}
|
|
|
|
#endif /* _LINUX_BINDER_ALLOC_H */
|
|
|