From patchwork Thu Jul 15 03:35:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 12378593 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 5D5AAC07E96 for ; Thu, 15 Jul 2021 04:20:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F44761103 for ; Thu, 15 Jul 2021 04:20:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235535AbhGOEXj (ORCPT ); Thu, 15 Jul 2021 00:23:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234416AbhGOEXi (ORCPT ); Thu, 15 Jul 2021 00:23:38 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FB48C06175F; Wed, 14 Jul 2021 21:20:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=Jt6GXjtGu7UeS5NRtWk7x4+slFhDyCi3h/+FjjmIbRg=; b=Dbuvzif2RWG0LtVz3I6BDxz9aG 1hGFxtFgiZlNP08SN8Z5UjexXaSzax9uUzZKFWIC8r+5qqxRD6CQ/BYfbYU4bIZ8nq+XNRRSTtxvO TSowEK3/lzsSAvq87gxKhh9Dr/PcO4cq7Owujr7T8IPOFpVcbluAXS+SgP6dGgT7uYhDS6roWayI5 qi+nbnAc92yjyNRewvEWtrblAMNa10rokVpNBdFCRelFe2/hkEovzf1xjPdiY6VwgyiQE55FDZDHa ++05iRoZk4no4YbsDrJZm4ens5bxa1LGTkfMRH3k3Cn6sBLidXETjGhinNgIhLwSln8r7vWVarlp6 b6vd7ndA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3sq3-002woR-Ke; Thu, 15 Jul 2021 04:19:22 +0000 From: "Matthew Wilcox (Oracle)" To: linux-kernel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v14 053/138] mm: Add flush_dcache_folio() Date: Thu, 15 Jul 2021 04:35:39 +0100 Message-Id: <20210715033704.692967-54-willy@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210715033704.692967-1-willy@infradead.org> References: <20210715033704.692967-1-willy@infradead.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This is a default implementation which calls flush_dcache_page() on each page in the folio. If architectures can do better, they should implement their own version of it. Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Vlastimil Babka --- Documentation/core-api/cachetlb.rst | 6 ++++++ arch/nds32/include/asm/cacheflush.h | 1 + include/asm-generic/cacheflush.h | 6 ++++++ mm/util.c | 13 +++++++++++++ 4 files changed, 26 insertions(+) diff --git a/Documentation/core-api/cachetlb.rst b/Documentation/core-api/cachetlb.rst index fe4290e26729..29682f69a915 100644 --- a/Documentation/core-api/cachetlb.rst +++ b/Documentation/core-api/cachetlb.rst @@ -325,6 +325,12 @@ maps this page at its virtual address. dirty. Again, see sparc64 for examples of how to deal with this. + ``void flush_dcache_folio(struct folio *folio)`` + This function is called under the same circumstances as + flush_dcache_page(). It allows the architecture to + optimise for flushing the entire folio of pages instead + of flushing one page at a time. + ``void copy_to_user_page(struct vm_area_struct *vma, struct page *page, unsigned long user_vaddr, void *dst, void *src, int len)`` ``void copy_from_user_page(struct vm_area_struct *vma, struct page *page, diff --git a/arch/nds32/include/asm/cacheflush.h b/arch/nds32/include/asm/cacheflush.h index 7d6824f7c0e8..f10d13af4ae5 100644 --- a/arch/nds32/include/asm/cacheflush.h +++ b/arch/nds32/include/asm/cacheflush.h @@ -38,6 +38,7 @@ void flush_anon_page(struct vm_area_struct *vma, #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE void flush_kernel_dcache_page(struct page *page); +void flush_dcache_folio(struct folio *folio); void flush_kernel_vmap_range(void *addr, int size); void invalidate_kernel_vmap_range(void *addr, int size); #define flush_dcache_mmap_lock(mapping) xa_lock_irq(&(mapping)->i_pages) diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h index 4a674db4e1fa..fedc0dfa4877 100644 --- a/include/asm-generic/cacheflush.h +++ b/include/asm-generic/cacheflush.h @@ -49,9 +49,15 @@ static inline void flush_cache_page(struct vm_area_struct *vma, static inline void flush_dcache_page(struct page *page) { } + +static inline void flush_dcache_folio(struct folio *folio) { } #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO #endif +#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO +void flush_dcache_folio(struct folio *folio); +#endif #ifndef flush_dcache_mmap_lock static inline void flush_dcache_mmap_lock(struct address_space *mapping) diff --git a/mm/util.c b/mm/util.c index d0aa1d9c811e..149537120a91 100644 --- a/mm/util.c +++ b/mm/util.c @@ -1057,3 +1057,16 @@ void page_offline_end(void) up_write(&page_offline_rwsem); } EXPORT_SYMBOL(page_offline_end); + +#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO +void flush_dcache_folio(struct folio *folio) +{ + unsigned int n = folio_nr_pages(folio); + + do { + n--; + flush_dcache_page(folio_page(folio, n)); + } while (n); +} +EXPORT_SYMBOL(flush_dcache_folio); +#endif