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https://github.com/AsahiLinux/u-boot
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5ea894ac42
Some tests access data in block devices and so cause the cache to fill up. This results in memory being allocated. Some tests check the malloc usage at the beginning and then again at the end, to ensure there is no memory leak caused by the test. The block cache makes this difficult, since the any test may cause entries to be allocated or even freed, if the cache becomes full. It is simpler to clear the block cache after each test. This ensures that it will not introduce noise in tests which check malloc usage. Add the logic to clear the cache, using the existing blkcache_invalidate() function. Drop the duplicate code at the same time. Signed-off-by: Simon Glass <sjg@chromium.org>
187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) Nelson Integration, LLC 2016
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* Author: Eric Nelson<eric@nelint.com>
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*
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*/
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#include <common.h>
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#include <blk.h>
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#include <log.h>
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#include <malloc.h>
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#include <part.h>
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#include <asm/global_data.h>
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#include <linux/ctype.h>
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#include <linux/list.h>
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#ifdef CONFIG_NEEDS_MANUAL_RELOC
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DECLARE_GLOBAL_DATA_PTR;
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#endif
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struct block_cache_node {
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struct list_head lh;
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int iftype;
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int devnum;
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lbaint_t start;
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lbaint_t blkcnt;
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unsigned long blksz;
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char *cache;
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};
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static LIST_HEAD(block_cache);
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static struct block_cache_stats _stats = {
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.max_blocks_per_entry = 8,
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.max_entries = 32
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};
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#ifdef CONFIG_NEEDS_MANUAL_RELOC
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int blkcache_init(void)
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{
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struct list_head *head = &block_cache;
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head->next = (uintptr_t)head->next + gd->reloc_off;
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head->prev = (uintptr_t)head->prev + gd->reloc_off;
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return 0;
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}
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#endif
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static struct block_cache_node *cache_find(int iftype, int devnum,
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lbaint_t start, lbaint_t blkcnt,
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unsigned long blksz)
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{
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struct block_cache_node *node;
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list_for_each_entry(node, &block_cache, lh)
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if ((node->iftype == iftype) &&
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(node->devnum == devnum) &&
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(node->blksz == blksz) &&
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(node->start <= start) &&
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(node->start + node->blkcnt >= start + blkcnt)) {
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if (block_cache.next != &node->lh) {
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/* maintain MRU ordering */
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list_del(&node->lh);
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list_add(&node->lh, &block_cache);
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}
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return node;
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}
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return 0;
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}
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int blkcache_read(int iftype, int devnum,
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lbaint_t start, lbaint_t blkcnt,
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unsigned long blksz, void *buffer)
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{
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struct block_cache_node *node = cache_find(iftype, devnum, start,
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blkcnt, blksz);
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if (node) {
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const char *src = node->cache + (start - node->start) * blksz;
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memcpy(buffer, src, blksz * blkcnt);
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debug("hit: start " LBAF ", count " LBAFU "\n",
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start, blkcnt);
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++_stats.hits;
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return 1;
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}
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debug("miss: start " LBAF ", count " LBAFU "\n",
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start, blkcnt);
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++_stats.misses;
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return 0;
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}
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void blkcache_fill(int iftype, int devnum,
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lbaint_t start, lbaint_t blkcnt,
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unsigned long blksz, void const *buffer)
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{
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lbaint_t bytes;
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struct block_cache_node *node;
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/* don't cache big stuff */
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if (blkcnt > _stats.max_blocks_per_entry)
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return;
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if (_stats.max_entries == 0)
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return;
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bytes = blksz * blkcnt;
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if (_stats.max_entries <= _stats.entries) {
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/* pop LRU */
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node = (struct block_cache_node *)block_cache.prev;
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list_del(&node->lh);
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_stats.entries--;
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debug("drop: start " LBAF ", count " LBAFU "\n",
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node->start, node->blkcnt);
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if (node->blkcnt * node->blksz < bytes) {
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free(node->cache);
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node->cache = 0;
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}
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} else {
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node = malloc(sizeof(*node));
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if (!node)
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return;
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node->cache = 0;
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}
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if (!node->cache) {
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node->cache = malloc(bytes);
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if (!node->cache) {
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free(node);
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return;
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}
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}
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debug("fill: start " LBAF ", count " LBAFU "\n",
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start, blkcnt);
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node->iftype = iftype;
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node->devnum = devnum;
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node->start = start;
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node->blkcnt = blkcnt;
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node->blksz = blksz;
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memcpy(node->cache, buffer, bytes);
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list_add(&node->lh, &block_cache);
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_stats.entries++;
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}
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void blkcache_invalidate(int iftype, int devnum)
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{
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struct list_head *entry, *n;
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struct block_cache_node *node;
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list_for_each_safe(entry, n, &block_cache) {
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node = (struct block_cache_node *)entry;
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if (iftype == -1 ||
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(node->iftype == iftype && node->devnum == devnum)) {
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list_del(entry);
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free(node->cache);
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free(node);
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--_stats.entries;
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}
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}
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}
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void blkcache_configure(unsigned blocks, unsigned entries)
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{
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/* invalidate cache if there is a change */
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if ((blocks != _stats.max_blocks_per_entry) ||
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(entries != _stats.max_entries))
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blkcache_invalidate(-1, 0);
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_stats.max_blocks_per_entry = blocks;
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_stats.max_entries = entries;
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_stats.hits = 0;
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_stats.misses = 0;
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}
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void blkcache_stats(struct block_cache_stats *stats)
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{
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memcpy(stats, &_stats, sizeof(*stats));
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_stats.hits = 0;
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_stats.misses = 0;
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}
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void blkcache_free(void)
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{
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blkcache_invalidate(-1, 0);
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}
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