300 lines
8.7 KiB
C
300 lines
8.7 KiB
C
/*
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* spiffs_cache.c
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*
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* Created on: Jun 23, 2013
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* Author: petera
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*/
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#include "spiffs.h"
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#include "spiffs_nucleus.h"
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#if SPIFFS_CACHE
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// returns cached page for give page index, or null if no such cached page
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static spiffs_cache_page *spiffs_cache_page_get(spiffs *fs, spiffs_page_ix pix) {
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spiffs_cache *cache = spiffs_get_cache(fs);
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if ((cache->cpage_use_map & cache->cpage_use_mask) == 0) return 0;
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int i;
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for (i = 0; i < cache->cpage_count; i++) {
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spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
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if ((cache->cpage_use_map & (1<<i)) &&
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(cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) == 0 &&
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cp->pix == pix ) {
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SPIFFS_CACHE_DBG("CACHE_GET: have cache page %i for %04x\n", i, pix);
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cp->last_access = cache->last_access;
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return cp;
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}
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}
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//SPIFFS_CACHE_DBG("CACHE_GET: no cache for %04x\n", pix);
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return 0;
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}
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// frees cached page
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static s32_t spiffs_cache_page_free(spiffs *fs, int ix, u8_t write_back) {
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s32_t res = SPIFFS_OK;
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spiffs_cache *cache = spiffs_get_cache(fs);
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spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, ix);
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if (cache->cpage_use_map & (1<<ix)) {
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if (write_back &&
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(cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) == 0 &&
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(cp->flags & SPIFFS_CACHE_FLAG_DIRTY)) {
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u8_t *mem = spiffs_get_cache_page(fs, cache, ix);
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res = SPIFFS_HAL_WRITE(fs, SPIFFS_PAGE_TO_PADDR(fs, cp->pix), SPIFFS_CFG_LOG_PAGE_SZ(fs), mem);
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}
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cp->flags = 0;
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cache->cpage_use_map &= ~(1 << ix);
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if (cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) {
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SPIFFS_CACHE_DBG("CACHE_FREE: free cache page %i objid %04x\n", ix, cp->obj_id);
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} else {
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SPIFFS_CACHE_DBG("CACHE_FREE: free cache page %i pix %04x\n", ix, cp->pix);
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}
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}
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return res;
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}
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// removes the oldest accessed cached page
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static s32_t spiffs_cache_page_remove_oldest(spiffs *fs, u8_t flag_mask, u8_t flags) {
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s32_t res = SPIFFS_OK;
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spiffs_cache *cache = spiffs_get_cache(fs);
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if ((cache->cpage_use_map & cache->cpage_use_mask) != cache->cpage_use_mask) {
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// at least one free cpage
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return SPIFFS_OK;
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}
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// all busy, scan thru all to find the cpage which has oldest access
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int i;
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int cand_ix = -1;
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u32_t oldest_val = 0;
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for (i = 0; i < cache->cpage_count; i++) {
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spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
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if ((cache->last_access - cp->last_access) > oldest_val &&
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(cp->flags & flag_mask) == flags) {
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oldest_val = cache->last_access - cp->last_access;
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cand_ix = i;
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}
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}
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if (cand_ix >= 0) {
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res = spiffs_cache_page_free(fs, cand_ix, 1);
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}
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return res;
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}
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// allocates a new cached page and returns it, or null if all cache pages are busy
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static spiffs_cache_page *spiffs_cache_page_allocate(spiffs *fs) {
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spiffs_cache *cache = spiffs_get_cache(fs);
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if (cache->cpage_use_map == 0xffffffff) {
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// out of cache memory
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return 0;
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}
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int i;
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for (i = 0; i < cache->cpage_count; i++) {
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if ((cache->cpage_use_map & (1<<i)) == 0) {
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spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
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cache->cpage_use_map |= (1<<i);
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cp->last_access = cache->last_access;
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SPIFFS_CACHE_DBG("CACHE_ALLO: allocated cache page %i\n", i);
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return cp;
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}
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}
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// out of cache entries
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return 0;
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}
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// drops the cache page for give page index
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void spiffs_cache_drop_page(spiffs *fs, spiffs_page_ix pix) {
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spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
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if (cp) {
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spiffs_cache_page_free(fs, cp->ix, 0);
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}
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}
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// ------------------------------
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// reads from spi flash or the cache
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s32_t spiffs_phys_rd(
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spiffs *fs,
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u8_t op,
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spiffs_file fh,
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u32_t addr,
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u32_t len,
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u8_t *dst) {
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(void)fh;
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s32_t res = SPIFFS_OK;
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spiffs_cache *cache = spiffs_get_cache(fs);
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spiffs_cache_page *cp = spiffs_cache_page_get(fs, SPIFFS_PADDR_TO_PAGE(fs, addr));
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cache->last_access++;
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if (cp) {
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#if SPIFFS_CACHE_STATS
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fs->cache_hits++;
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#endif
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cp->last_access = cache->last_access;
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} else {
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if ((op & SPIFFS_OP_TYPE_MASK) == SPIFFS_OP_T_OBJ_LU2) {
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// for second layer lookup functions, we do not cache in order to prevent shredding
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return SPIFFS_HAL_READ(fs, addr, len, dst);
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}
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#if SPIFFS_CACHE_STATS
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fs->cache_misses++;
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#endif
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res = spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
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cp = spiffs_cache_page_allocate(fs);
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if (cp) {
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cp->flags = SPIFFS_CACHE_FLAG_WRTHRU;
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cp->pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
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}
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s32_t res2 = SPIFFS_HAL_READ(fs,
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addr - SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr),
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SPIFFS_CFG_LOG_PAGE_SZ(fs),
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spiffs_get_cache_page(fs, cache, cp->ix));
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if (res2 != SPIFFS_OK) {
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res = res2;
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}
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}
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u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
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memcpy(dst, &mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], len);
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return res;
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}
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// writes to spi flash and/or the cache
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s32_t spiffs_phys_wr(
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spiffs *fs,
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u8_t op,
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spiffs_file fh,
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u32_t addr,
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u32_t len,
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u8_t *src) {
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(void)fh;
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spiffs_page_ix pix = SPIFFS_PADDR_TO_PAGE(fs, addr);
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spiffs_cache *cache = spiffs_get_cache(fs);
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spiffs_cache_page *cp = spiffs_cache_page_get(fs, pix);
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if (cp && (op & SPIFFS_OP_COM_MASK) != SPIFFS_OP_C_WRTHRU) {
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// have a cache page
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// copy in data to cache page
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if ((op & SPIFFS_OP_COM_MASK) == SPIFFS_OP_C_DELE &&
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(op & SPIFFS_OP_TYPE_MASK) != SPIFFS_OP_T_OBJ_LU) {
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// page is being deleted, wipe from cache - unless it is a lookup page
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spiffs_cache_page_free(fs, cp->ix, 0);
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return SPIFFS_HAL_WRITE(fs, addr, len, src);
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}
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u8_t *mem = spiffs_get_cache_page(fs, cache, cp->ix);
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memcpy(&mem[SPIFFS_PADDR_TO_PAGE_OFFSET(fs, addr)], src, len);
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cache->last_access++;
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cp->last_access = cache->last_access;
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if (cp->flags & SPIFFS_CACHE_FLAG_WRTHRU) {
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// page is being updated, no write-cache, just pass thru
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return SPIFFS_HAL_WRITE(fs, addr, len, src);
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} else {
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return SPIFFS_OK;
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}
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} else {
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// no cache page, no write cache - just write thru
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return SPIFFS_HAL_WRITE(fs, addr, len, src);
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}
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}
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#if SPIFFS_CACHE_WR
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// returns the cache page that this fd refers, or null if no cache page
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spiffs_cache_page *spiffs_cache_page_get_by_fd(spiffs *fs, spiffs_fd *fd) {
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spiffs_cache *cache = spiffs_get_cache(fs);
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if ((cache->cpage_use_map & cache->cpage_use_mask) == 0) {
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// all cpages free, no cpage cannot be assigned to obj_id
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return 0;
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}
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int i;
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for (i = 0; i < cache->cpage_count; i++) {
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spiffs_cache_page *cp = spiffs_get_cache_page_hdr(fs, cache, i);
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if ((cache->cpage_use_map & (1<<i)) &&
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(cp->flags & SPIFFS_CACHE_FLAG_TYPE_WR) &&
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cp->obj_id == fd->obj_id) {
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return cp;
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}
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}
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return 0;
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}
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// allocates a new cache page and refers this to given fd - flushes an old cache
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// page if all cache is busy
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spiffs_cache_page *spiffs_cache_page_allocate_by_fd(spiffs *fs, spiffs_fd *fd) {
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// before this function is called, it is ensured that there is no already existing
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// cache page with same object id
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spiffs_cache_page_remove_oldest(fs, SPIFFS_CACHE_FLAG_TYPE_WR, 0);
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spiffs_cache_page *cp = spiffs_cache_page_allocate(fs);
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if (cp == 0) {
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// could not get cache page
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return 0;
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}
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cp->flags = SPIFFS_CACHE_FLAG_TYPE_WR;
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cp->obj_id = fd->obj_id;
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fd->cache_page = cp;
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return cp;
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}
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// unrefers all fds that this cache page refers to and releases the cache page
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void spiffs_cache_fd_release(spiffs *fs, spiffs_cache_page *cp) {
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if (cp == 0) return;
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u32_t i;
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spiffs_fd *fds = (spiffs_fd *)fs->fd_space;
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for (i = 0; i < fs->fd_count; i++) {
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spiffs_fd *cur_fd = &fds[i];
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if (cur_fd->file_nbr != 0 && cur_fd->cache_page == cp) {
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cur_fd->cache_page = 0;
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}
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}
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spiffs_cache_page_free(fs, cp->ix, 0);
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cp->obj_id = 0;
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}
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#endif
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// initializes the cache
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void spiffs_cache_init(spiffs *fs) {
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if (fs->cache == 0) return;
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u32_t sz = fs->cache_size;
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u32_t cache_mask = 0;
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int i;
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int cache_entries =
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(sz - sizeof(spiffs_cache)) / (SPIFFS_CACHE_PAGE_SIZE(fs));
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if (cache_entries <= 0) return;
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for (i = 0; i < cache_entries; i++) {
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cache_mask <<= 1;
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cache_mask |= 1;
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}
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spiffs_cache cache;
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memset(&cache, 0, sizeof(spiffs_cache));
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cache.cpage_count = cache_entries;
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cache.cpages = (u8_t *)((u8_t *)fs->cache + sizeof(spiffs_cache));
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cache.cpage_use_map = 0xffffffff;
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cache.cpage_use_mask = cache_mask;
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memcpy(fs->cache, &cache, sizeof(spiffs_cache));
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spiffs_cache *c = spiffs_get_cache(fs);
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memset(c->cpages, 0, c->cpage_count * SPIFFS_CACHE_PAGE_SIZE(fs));
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c->cpage_use_map &= ~(c->cpage_use_mask);
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for (i = 0; i < cache.cpage_count; i++) {
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spiffs_get_cache_page_hdr(fs, c, i)->ix = i;
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}
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}
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#endif // SPIFFS_CACHE
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