From: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
This patch implements the bch_nvm_alloc_pages() of the buddy.
In terms of function, this func is like current-page-buddy-alloc.
But the differences are:
a: it need owner_uuid as parameter which record owner info. And it
make those info persistence.
b: it don't need flags like GFP_*. All allocs are the equal.
c: it don't trigger other ops etc swap/recycle.
Signed-off-by: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
Co-developed-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
Signed-off-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
Signed-off-by: Coly Li <colyli@xxxxxxx>
---
drivers/md/bcache/nvm-pages.c | 174 ++++++++++++++++++++++++++++++++
drivers/md/bcache/nvm-pages.h | 6 ++
include/uapi/linux/bcache-nvm.h | 6 +-
3 files changed, 184 insertions(+), 2 deletions(-)
diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 804ee66e97be..5d095d241483 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -74,6 +74,180 @@ static inline void remove_owner_space(struct bch_nvm_namespace *ns,
}
}
+/* If not found, it will create if create == true */
+static struct bch_nvm_pages_owner_head *find_owner_head(const char *owner_uuid, bool create)
+{
+ struct bch_owner_list_head *owner_list_head = only_set->owner_list_head;
+ struct bch_nvm_pages_owner_head *owner_head = NULL;
+ int i;
+
+ if (owner_list_head == NULL)
+ goto out;
+
+ for (i = 0; i < only_set->owner_list_used; i++) {
+ if (!memcmp(owner_uuid, owner_list_head->heads[i].uuid, 16)) {
+ owner_head = &(owner_list_head->heads[i]);
+ break;
+ }
+ }
+
+ if (!owner_head && create) {
+ u32 used = only_set->owner_list_used;
+
+ if (only_set->owner_list_size > used) {
+ memcpy_flushcache(owner_list_head->heads[used].uuid, owner_uuid, 16);
+ only_set->owner_list_used++;
+
+ owner_list_head->used++;
+ owner_head = &(owner_list_head->heads[used]);
+ } else
+ pr_info("no free bch_nvm_pages_owner_head\n");
+ }
+
+out:
+ return owner_head;
+}
+
+static struct bch_nvm_pgalloc_recs *find_empty_pgalloc_recs(void)
+{
+ unsigned int start;
+ struct bch_nvm_namespace *ns = only_set->nss[0];
+ struct bch_nvm_pgalloc_recs *recs;
+
+ start = bitmap_find_next_zero_area(ns->pgalloc_recs_bitmap, BCH_MAX_PGALLOC_RECS, 0, 1, 0);
+ if (start > BCH_MAX_PGALLOC_RECS) {
+ pr_info("no free struct bch_nvm_pgalloc_recs\n");
+ return NULL;
+ }
+
+ bitmap_set(ns->pgalloc_recs_bitmap, start, 1);
+ recs = (struct bch_nvm_pgalloc_recs *)(ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET)
+ + start;
+ return recs;
+}
+
+static struct bch_nvm_pgalloc_recs *find_nvm_pgalloc_recs(struct bch_nvm_namespace *ns,
+ struct bch_nvm_pages_owner_head *owner_head, bool create)
+{
+ int ns_nr = ns->sb->this_namespace_nr;
+ struct bch_nvm_pgalloc_recs *prev_recs = NULL, *recs = owner_head->recs[ns_nr];
+
+ /* If create=false, we return recs[nr] */
+ if (!create)
+ return recs;
+
+ /*
+ * If create=true, it mean we need a empty struct bch_pgalloc_rec
+ * So we should find non-empty struct bch_nvm_pgalloc_recs or alloc
+ * new struct bch_nvm_pgalloc_recs. And return this bch_nvm_pgalloc_recs
+ */
+ while (recs && (recs->used == recs->size)) {
+ prev_recs = recs;
+ recs = recs->next;
+ }
+
+ /* Found empty struct bch_nvm_pgalloc_recs */
+ if (recs)
+ return recs;
+ /* Need alloc new struct bch_nvm_galloc_recs */
+ recs = find_empty_pgalloc_recs();
+ if (recs) {
+ recs->next = NULL;
+ recs->owner = owner_head;
+ memcpy_flushcache(recs->magic, bch_nvm_pages_pgalloc_magic, 16);
+ memcpy_flushcache(recs->owner_uuid, owner_head->uuid, 16);
+ recs->size = BCH_MAX_RECS;
+ recs->used = 0;
+
+ if (prev_recs)
+ prev_recs->next = recs;
+ else
+ owner_head->recs[ns_nr] = recs;
+ }
+
+ return recs;
+}
+
+static void add_pgalloc_rec(struct bch_nvm_pgalloc_recs *recs, void *kaddr, int order)
+{
+ int i;
+
+ for (i = 0; i < recs->size; i++) {
+ if (recs->recs[i].pgoff == 0) {
+ recs->recs[i].pgoff = (unsigned long)kaddr >> PAGE_SHIFT;
+ recs->recs[i].order = order;
+ recs->used++;
+ break;
+ }
+ }
+ BUG_ON(i == recs->size);
+}
+
+void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
+{
+ void *kaddr = NULL;
+ struct bch_nvm_pgalloc_recs *pgalloc_recs;
+ struct bch_nvm_pages_owner_head *owner_head;
+ int i, j;
+
+ mutex_lock(&only_set->lock);
+ owner_head = find_owner_head(owner_uuid, true);
+
+ if (!owner_head) {
+ pr_err("can't find bch_nvm_pgalloc_recs by(uuid=%s)\n", owner_uuid);
+ goto unlock;
+ }
+
+ for (j = 0; j < only_set->total_namespaces_nr; j++) {
+ struct bch_nvm_namespace *ns = only_set->nss[j];
+
+ if (!ns || (ns->free < (1L << order)))
+ continue;
+
+ for (i = order; i < BCH_MAX_ORDER; i++) {
+ struct list_head *list;
+ struct page *page, *buddy_page;
+
+ if (list_empty(&ns->free_area[i]))
+ continue;
+
+ list = ns->free_area[i].next;
+ page = container_of((void *)list, struct page, zone_device_data);
+
+ list_del(list);
+
+ while (i != order) {
+ buddy_page = nvm_vaddr_to_page(ns,
+ nvm_pgoff_to_vaddr(ns, page->index + (1L << (i - 1))));
+ set_page_private(buddy_page, i - 1);
+ buddy_page->index = page->index + (1L << (i - 1));
+ __SetPageBuddy(buddy_page);
+ list_add((struct list_head *)&buddy_page->zone_device_data,
+ &ns->free_area[i - 1]);
+ i--;
+ }
+
+ set_page_private(page, order);
+ __ClearPageBuddy(page);
+ ns->free -= 1L << order;
+ kaddr = nvm_pgoff_to_vaddr(ns, page->index);
+ break;
+ }
+
+ if (i < BCH_MAX_ORDER) {
+ pgalloc_recs = find_nvm_pgalloc_recs(ns, owner_head, true);
+ /* ToDo: handle pgalloc_recs==NULL */
+ add_pgalloc_rec(pgalloc_recs, kaddr, order);
+ break;
+ }
+ }
+
+unlock:
+ mutex_unlock(&only_set->lock);
+ return kaddr;
+}
+EXPORT_SYMBOL_GPL(bch_nvm_alloc_pages);
+
#define BCH_PGOFF_TO_KVADDR(pgoff) ((void *)((unsigned long)pgoff << PAGE_SHIFT))
static int init_owner_info(struct bch_nvm_namespace *ns)
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 71beb244b9be..f2583723aca6 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -62,6 +62,7 @@ extern struct bch_nvm_set *only_set;
struct bch_nvm_namespace *bch_register_namespace(const char *dev_path);
int bch_nvm_init(void);
void bch_nvm_exit(void);
+void *bch_nvm_alloc_pages(int order, const char *owner_uuid);
#else
@@ -74,6 +75,11 @@ static inline int bch_nvm_init(void)
return 0;
}
static inline void bch_nvm_exit(void) { }
+static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
+{
+ return NULL;
+}
+
#endif /* CONFIG_BCACHE_NVM_PAGES */
diff --git a/include/uapi/linux/bcache-nvm.h b/include/uapi/linux/bcache-nvm.h
index 1fdb3eaabf7e..9cb937292202 100644
--- a/include/uapi/linux/bcache-nvm.h
+++ b/include/uapi/linux/bcache-nvm.h
@@ -135,9 +135,11 @@ union {
offsetof(struct bch_nvm_pgalloc_recs, recs)) / \
sizeof(struct bch_pgalloc_rec))
+/* Currently 64 struct bch_nvm_pgalloc_recs is enough */
#define BCH_MAX_PGALLOC_RECS \
- ((BCH_NVM_PAGES_OFFSET - BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET) / \
- sizeof(struct bch_nvm_pgalloc_recs))
+ (min_t(unsigned int, 64, \
+ (BCH_NVM_PAGES_OFFSET - BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET) / \
+ sizeof(struct bch_nvm_pgalloc_recs)))
struct bch_nvm_pages_owner_head {
unsigned char uuid[16];
--
2.26.2
