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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
173 lines
3.7 KiB
C
173 lines
3.7 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 <config.h>
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#include <common.h>
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#include <malloc.h>
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#include <part.h>
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#include <linux/ctype.h>
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#include <linux/list.h>
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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 = 2,
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.max_entries = 32
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};
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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 ((node->iftype == iftype) &&
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(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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struct block_cache_node *node;
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if ((blocks != _stats.max_blocks_per_entry) ||
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(entries != _stats.max_entries)) {
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/* invalidate cache */
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while (!list_empty(&block_cache)) {
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node = (struct block_cache_node *)block_cache.next;
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list_del(&node->lh);
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free(node->cache);
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free(node);
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}
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_stats.entries = 0;
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}
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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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