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ftl: cache unmapped translations

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This commit is contained in:
S.J.R. van Schaik 2017-07-24 13:24:48 +02:00
parent f68e26ac12
commit 15d2f6dc4b
2 changed files with 14 additions and 2 deletions
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1
include/ftl.h
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@ -32,6 +32,7 @@ struct ftl_map {
};
#define FTL_CACHED_VA BIT(0)
#define FTL_UNMAPPED BIT(1)
#define FTL_MAX_ATTEMPTS 8

15
source/ftl/map.c
View file

@ -382,8 +382,15 @@ int trace_path(struct ftl_map *map, struct ftl_page_desc *new_page_desc,
uint8_t depth = 0;
uint32_t upage = map->root;
if ((map->flags & FTL_CACHED_VA) && map->last_va == va)
return map->last_pa;
if ((map->flags & FTL_CACHED_VA) && map->last_va == va) {
if (map->flags & FTL_UNMAPPED)
return -1;
if (page)
*page = map->last_pa;
return 0;
}
if (new_page_desc)
new_page_desc->va = va;
@ -421,6 +428,7 @@ int trace_path(struct ftl_map *map, struct ftl_page_desc *new_page_desc,
*page = upage;
map->flags |= FTL_CACHED_VA;
map->flags &= ~FTL_UNMAPPED;
map->last_va = va;
map->last_pa = upage;
@ -433,5 +441,8 @@ err_not_found:
}
}
map->flags |= FTL_CACHED_VA | FTL_UNMAPPED;
map->last_va = va;
return -ERR_NOT_FOUND;
}