From patchwork Fri Apr 9 16:43:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Coly Li X-Patchwork-Id: 12194549 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1251EC433ED for ; Fri, 9 Apr 2021 16:44:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4766610A7 for ; Fri, 9 Apr 2021 16:44:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233896AbhDIQoe (ORCPT ); Fri, 9 Apr 2021 12:44:34 -0400 Received: from mx2.suse.de ([195.135.220.15]:34928 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233929AbhDIQod (ORCPT ); Fri, 9 Apr 2021 12:44:33 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 7343BAE6D; Fri, 9 Apr 2021 16:44:19 +0000 (UTC) From: Coly Li To: linux-bcache@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-nvdimm@lists.01.org, axboe@kernel.dk, jianpeng.ma@intel.com, qiaowei.ren@intel.com, hare@suse.com, jack@suse.cz, dan.j.williams@intel.com Subject: [PATCH v7 05/16] bcache: bch_nvm_free_pages() of the buddy Date: Sat, 10 Apr 2021 00:43:32 +0800 Message-Id: <20210409164343.56828-6-colyli@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210409164343.56828-1-colyli@suse.de> References: <20210409164343.56828-1-colyli@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Jianpeng Ma This patch implements the bch_nvm_free_pages() of the buddy. Signed-off-by: Jianpeng Ma Co-authored-by: Qiaowei Ren --- drivers/md/bcache/nvm-pages.c | 158 +++++++++++++++++++++++++++++++++- drivers/md/bcache/nvm-pages.h | 3 + 2 files changed, 157 insertions(+), 4 deletions(-) diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c index 6bdc7d3773de..e576b4cb4850 100644 --- a/drivers/md/bcache/nvm-pages.c +++ b/drivers/md/bcache/nvm-pages.c @@ -166,6 +166,155 @@ static void add_pgalloc_rec(struct bch_nvm_pgalloc_recs *recs, void *kaddr, int BUG_ON(i == recs->size); } +static inline void *nvm_end_addr(struct bch_nvm_namespace *ns) +{ + return ns->kaddr + (ns->pages_total << PAGE_SHIFT); +} + +static inline bool in_nvm_range(struct bch_nvm_namespace *ns, + void *start_addr, void *end_addr) +{ + return (start_addr >= ns->kaddr) && (end_addr <= nvm_end_addr(ns)); +} + +static struct bch_nvm_namespace *find_nvm_by_addr(void *addr, int order) +{ + int i; + struct bch_nvm_namespace *ns; + + for (i = 0; i < only_set->total_namespaces_nr; i++) { + ns = only_set->nss[i]; + if (ns && in_nvm_range(ns, addr, addr + (1 << order))) + return ns; + } + return NULL; +} + +static int remove_pgalloc_rec(struct bch_nvm_pgalloc_recs *pgalloc_recs, int ns_nr, + void *kaddr, int order) +{ + struct bch_nvm_pages_owner_head *owner_head = pgalloc_recs->owner; + struct bch_nvm_pgalloc_recs *prev_recs, *sys_recs; + u64 pgoff = (unsigned long)kaddr >> PAGE_SHIFT; + struct bch_nvm_namespace *ns = only_set->nss[0]; + int i; + + prev_recs = pgalloc_recs; + sys_recs = ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET; + while (pgalloc_recs) { + for (i = 0; i < pgalloc_recs->size; i++) { + struct bch_pgalloc_rec *rec = &(pgalloc_recs->recs[i]); + + if (rec->pgoff == pgoff) { + WARN_ON(rec->order != order); + rec->pgoff = 0; + rec->order = 0; + pgalloc_recs->used--; + + if (pgalloc_recs->used == 0) { + int recs_pos = pgalloc_recs - sys_recs; + + if (pgalloc_recs == prev_recs) + owner_head->recs[ns_nr] = pgalloc_recs->next; + else + prev_recs->next = pgalloc_recs->next; + + pgalloc_recs->next = NULL; + pgalloc_recs->owner = NULL; + + bitmap_clear(ns->pgalloc_recs_bitmap, recs_pos, 1); + } + goto exit; + } + } + prev_recs = pgalloc_recs; + pgalloc_recs = pgalloc_recs->next; + } +exit: + return pgalloc_recs ? 0 : -ENOENT; +} + +static void __free_space(struct bch_nvm_namespace *ns, void *addr, int order) +{ + unsigned int add_pages = (1 << order); + pgoff_t pgoff; + struct page *page; + + page = nvm_vaddr_to_page(ns, addr); + WARN_ON((!page) || (page->private != order)); + pgoff = page->index; + + while (order < BCH_MAX_ORDER - 1) { + struct page *buddy_page; + + pgoff_t buddy_pgoff = pgoff ^ (1 << order); + pgoff_t parent_pgoff = pgoff & ~(1 << order); + + if ((parent_pgoff + (1 << (order + 1)) > ns->pages_total)) + break; + + buddy_page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, buddy_pgoff)); + WARN_ON(!buddy_page); + + if (PageBuddy(buddy_page) && (buddy_page->private == order)) { + list_del((struct list_head *)&buddy_page->zone_device_data); + __ClearPageBuddy(buddy_page); + pgoff = parent_pgoff; + order++; + continue; + } + break; + } + + page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff)); + WARN_ON(!page); + list_add((struct list_head *)&page->zone_device_data, &ns->free_area[order]); + page->index = pgoff; + set_page_private(page, order); + __SetPageBuddy(page); + ns->free += add_pages; +} + +void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) +{ + struct bch_nvm_namespace *ns; + struct bch_nvm_pages_owner_head *owner_head; + struct bch_nvm_pgalloc_recs *pgalloc_recs; + int r; + + mutex_lock(&only_set->lock); + + ns = find_nvm_by_addr(addr, order); + if (!ns) { + pr_info("can't find nvm_dev by kaddr %p\n", addr); + goto unlock; + } + + owner_head = find_owner_head(owner_uuid, false); + if (!owner_head) { + pr_info("can't found bch_nvm_pages_owner_head by(uuid=%s)\n", owner_uuid); + goto unlock; + } + + pgalloc_recs = find_nvm_pgalloc_recs(ns, owner_head, false); + if (!pgalloc_recs) { + pr_info("can't find bch_nvm_pgalloc_recs by(uuid=%s)\n", owner_uuid); + goto unlock; + } + + r = remove_pgalloc_rec(pgalloc_recs, ns->sb->this_namespace_nr, addr, order); + if (r < 0) { + pr_info("can't find bch_pgalloc_rec\n"); + goto unlock; + } + + __free_space(ns, addr, order); + +unlock: + mutex_unlock(&only_set->lock); +} +EXPORT_SYMBOL_GPL(bch_nvm_free_pages); + void *bch_nvm_alloc_pages(int order, const char *owner_uuid) { void *kaddr = NULL; @@ -302,7 +451,7 @@ static void init_nvm_free_space(struct bch_nvm_namespace *ns) { unsigned int start, end, i; struct page *page; - long long pages; + u64 pages; pgoff_t pgoff_start; bitmap_for_each_clear_region(ns->pages_bitmap, start, end, 0, ns->pages_total) { @@ -318,8 +467,9 @@ static void init_nvm_free_space(struct bch_nvm_namespace *ns) page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff_start)); page->index = pgoff_start; set_page_private(page, i); - __SetPageBuddy(page); - list_add((struct list_head *)&page->zone_device_data, &ns->free_area[i]); + + /* in order to update ns->free */ + __free_space(ns, nvm_pgoff_to_vaddr(ns, pgoff_start), i); pgoff_start += 1 << i; pages -= 1 << i; @@ -499,7 +649,7 @@ struct bch_nvm_namespace *bch_register_namespace(const char *dev_path) ns->page_size = ns->sb->page_size; ns->pages_offset = ns->sb->pages_offset; ns->pages_total = ns->sb->pages_total; - ns->free = 0; + ns->free = 0; /* increase by __free_space() */ ns->bdev = bdev; ns->nvm_set = only_set; mutex_init(&ns->lock); diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h index b2c0e0cfac20..4ea831894583 100644 --- a/drivers/md/bcache/nvm-pages.h +++ b/drivers/md/bcache/nvm-pages.h @@ -61,6 +61,7 @@ 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); +void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid); #else @@ -78,6 +79,8 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid) return NULL; } +static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { } + #endif /* CONFIG_BCACHE_NVM_PAGES */ #endif /* _BCACHE_NVM_PAGES_H */