311 lines
8.3 KiB
C
311 lines
8.3 KiB
C
/* binder_alloc_selftest.c
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*
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* Android IPC Subsystem
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*
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* Copyright (C) 2017 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/mm_types.h>
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#include <linux/err.h>
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#include "binder_alloc.h"
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#define BUFFER_NUM 5
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#define BUFFER_MIN_SIZE (PAGE_SIZE / 8)
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static bool binder_selftest_run = true;
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static int binder_selftest_failures;
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static DEFINE_MUTEX(binder_selftest_lock);
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/**
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* enum buf_end_align_type - Page alignment of a buffer
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* end with regard to the end of the previous buffer.
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*
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* In the pictures below, buf2 refers to the buffer we
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* are aligning. buf1 refers to previous buffer by addr.
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* Symbol [ means the start of a buffer, ] means the end
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* of a buffer, and | means page boundaries.
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*/
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enum buf_end_align_type {
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/**
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* @SAME_PAGE_UNALIGNED: The end of this buffer is on
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* the same page as the end of the previous buffer and
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* is not page aligned. Examples:
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* buf1 ][ buf2 ][ ...
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* buf1 ]|[ buf2 ][ ...
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*/
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SAME_PAGE_UNALIGNED = 0,
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/**
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* @SAME_PAGE_ALIGNED: When the end of the previous buffer
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* is not page aligned, the end of this buffer is on the
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* same page as the end of the previous buffer and is page
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* aligned. When the previous buffer is page aligned, the
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* end of this buffer is aligned to the next page boundary.
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* Examples:
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* buf1 ][ buf2 ]| ...
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* buf1 ]|[ buf2 ]| ...
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*/
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SAME_PAGE_ALIGNED,
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/**
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* @NEXT_PAGE_UNALIGNED: The end of this buffer is on
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* the page next to the end of the previous buffer and
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* is not page aligned. Examples:
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* buf1 ][ buf2 | buf2 ][ ...
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* buf1 ]|[ buf2 | buf2 ][ ...
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*/
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NEXT_PAGE_UNALIGNED,
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/**
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* @NEXT_PAGE_ALIGNED: The end of this buffer is on
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* the page next to the end of the previous buffer and
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* is page aligned. Examples:
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* buf1 ][ buf2 | buf2 ]| ...
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* buf1 ]|[ buf2 | buf2 ]| ...
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*/
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NEXT_PAGE_ALIGNED,
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/**
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* @NEXT_NEXT_UNALIGNED: The end of this buffer is on
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* the page that follows the page after the end of the
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* previous buffer and is not page aligned. Examples:
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* buf1 ][ buf2 | buf2 | buf2 ][ ...
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* buf1 ]|[ buf2 | buf2 | buf2 ][ ...
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*/
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NEXT_NEXT_UNALIGNED,
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LOOP_END,
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};
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static void pr_err_size_seq(size_t *sizes, int *seq)
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{
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int i;
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pr_err("alloc sizes: ");
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for (i = 0; i < BUFFER_NUM; i++)
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pr_cont("[%zu]", sizes[i]);
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pr_cont("\n");
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pr_err("free seq: ");
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for (i = 0; i < BUFFER_NUM; i++)
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pr_cont("[%d]", seq[i]);
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pr_cont("\n");
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}
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static bool check_buffer_pages_allocated(struct binder_alloc *alloc,
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struct binder_buffer *buffer,
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size_t size)
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{
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void *page_addr, *end;
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int page_index;
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end = (void *)PAGE_ALIGN((uintptr_t)buffer->data + size);
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page_addr = buffer->data;
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for (; page_addr < end; page_addr += PAGE_SIZE) {
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page_index = (page_addr - alloc->buffer) / PAGE_SIZE;
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if (!alloc->pages[page_index].page_ptr ||
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!list_empty(&alloc->pages[page_index].lru)) {
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pr_err("expect alloc but is %s at page index %d\n",
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alloc->pages[page_index].page_ptr ?
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"lru" : "free", page_index);
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return false;
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}
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}
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return true;
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}
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static void binder_selftest_alloc_buf(struct binder_alloc *alloc,
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struct binder_buffer *buffers[],
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size_t *sizes, int *seq)
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{
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int i;
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for (i = 0; i < BUFFER_NUM; i++) {
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buffers[i] = binder_alloc_new_buf(alloc, sizes[i], 0, 0, 0);
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if (IS_ERR(buffers[i]) ||
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!check_buffer_pages_allocated(alloc, buffers[i],
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sizes[i])) {
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pr_err_size_seq(sizes, seq);
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binder_selftest_failures++;
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}
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}
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}
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static void binder_selftest_free_buf(struct binder_alloc *alloc,
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struct binder_buffer *buffers[],
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size_t *sizes, int *seq, size_t end)
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{
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int i;
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for (i = 0; i < BUFFER_NUM; i++)
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binder_alloc_free_buf(alloc, buffers[seq[i]]);
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for (i = 0; i < end / PAGE_SIZE; i++) {
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/**
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* Error message on a free page can be false positive
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* if binder shrinker ran during binder_alloc_free_buf
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* calls above.
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*/
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if (list_empty(&alloc->pages[i].lru)) {
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pr_err_size_seq(sizes, seq);
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pr_err("expect lru but is %s at page index %d\n",
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alloc->pages[i].page_ptr ? "alloc" : "free", i);
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binder_selftest_failures++;
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}
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}
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}
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static void binder_selftest_free_page(struct binder_alloc *alloc)
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{
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int i;
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unsigned long count;
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while ((count = list_lru_count(&binder_alloc_lru))) {
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list_lru_walk(&binder_alloc_lru, binder_alloc_free_page,
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NULL, count);
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}
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for (i = 0; i < (alloc->buffer_size / PAGE_SIZE); i++) {
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if (alloc->pages[i].page_ptr) {
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pr_err("expect free but is %s at page index %d\n",
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list_empty(&alloc->pages[i].lru) ?
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"alloc" : "lru", i);
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binder_selftest_failures++;
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}
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}
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}
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static void binder_selftest_alloc_free(struct binder_alloc *alloc,
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size_t *sizes, int *seq, size_t end)
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{
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struct binder_buffer *buffers[BUFFER_NUM];
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binder_selftest_alloc_buf(alloc, buffers, sizes, seq);
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binder_selftest_free_buf(alloc, buffers, sizes, seq, end);
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/* Allocate from lru. */
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binder_selftest_alloc_buf(alloc, buffers, sizes, seq);
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if (list_lru_count(&binder_alloc_lru))
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pr_err("lru list should be empty but is not\n");
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binder_selftest_free_buf(alloc, buffers, sizes, seq, end);
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binder_selftest_free_page(alloc);
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}
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static bool is_dup(int *seq, int index, int val)
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{
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int i;
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for (i = 0; i < index; i++) {
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if (seq[i] == val)
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return true;
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}
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return false;
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}
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/* Generate BUFFER_NUM factorial free orders. */
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static void binder_selftest_free_seq(struct binder_alloc *alloc,
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size_t *sizes, int *seq,
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int index, size_t end)
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{
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int i;
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if (index == BUFFER_NUM) {
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binder_selftest_alloc_free(alloc, sizes, seq, end);
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return;
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}
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for (i = 0; i < BUFFER_NUM; i++) {
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if (is_dup(seq, index, i))
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continue;
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seq[index] = i;
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binder_selftest_free_seq(alloc, sizes, seq, index + 1, end);
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}
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}
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static void binder_selftest_alloc_size(struct binder_alloc *alloc,
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size_t *end_offset)
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{
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int i;
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int seq[BUFFER_NUM] = {0};
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size_t front_sizes[BUFFER_NUM];
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size_t back_sizes[BUFFER_NUM];
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size_t last_offset, offset = 0;
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for (i = 0; i < BUFFER_NUM; i++) {
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last_offset = offset;
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offset = end_offset[i];
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front_sizes[i] = offset - last_offset;
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back_sizes[BUFFER_NUM - i - 1] = front_sizes[i];
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}
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/*
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* Buffers share the first or last few pages.
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* Only BUFFER_NUM - 1 buffer sizes are adjustable since
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* we need one giant buffer before getting to the last page.
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*/
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back_sizes[0] += alloc->buffer_size - end_offset[BUFFER_NUM - 1];
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binder_selftest_free_seq(alloc, front_sizes, seq, 0,
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end_offset[BUFFER_NUM - 1]);
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binder_selftest_free_seq(alloc, back_sizes, seq, 0, alloc->buffer_size);
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}
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static void binder_selftest_alloc_offset(struct binder_alloc *alloc,
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size_t *end_offset, int index)
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{
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int align;
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size_t end, prev;
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if (index == BUFFER_NUM) {
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binder_selftest_alloc_size(alloc, end_offset);
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return;
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}
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prev = index == 0 ? 0 : end_offset[index - 1];
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end = prev;
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BUILD_BUG_ON(BUFFER_MIN_SIZE * BUFFER_NUM >= PAGE_SIZE);
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for (align = SAME_PAGE_UNALIGNED; align < LOOP_END; align++) {
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if (align % 2)
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end = ALIGN(end, PAGE_SIZE);
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else
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end += BUFFER_MIN_SIZE;
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end_offset[index] = end;
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binder_selftest_alloc_offset(alloc, end_offset, index + 1);
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}
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}
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/**
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* binder_selftest_alloc() - Test alloc and free of buffer pages.
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* @alloc: Pointer to alloc struct.
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*
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* Allocate BUFFER_NUM buffers to cover all page alignment cases,
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* then free them in all orders possible. Check that pages are
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* correctly allocated, put onto lru when buffers are freed, and
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* are freed when binder_alloc_free_page is called.
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*/
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void binder_selftest_alloc(struct binder_alloc *alloc)
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{
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size_t end_offset[BUFFER_NUM];
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if (!binder_selftest_run)
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return;
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mutex_lock(&binder_selftest_lock);
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if (!binder_selftest_run || !alloc->vma)
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goto done;
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pr_info("STARTED\n");
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binder_selftest_alloc_offset(alloc, end_offset, 0);
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binder_selftest_run = false;
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if (binder_selftest_failures > 0)
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pr_info("%d tests FAILED\n", binder_selftest_failures);
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else
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pr_info("PASSED\n");
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done:
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mutex_unlock(&binder_selftest_lock);
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}
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