From mboxrd@z Thu Jan 1 00:00:00 1970 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,URIBL_BLOCKED, 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 CD1D9C433B4 for ; Wed, 5 May 2021 16:05:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8DD5613C3 for ; Wed, 5 May 2021 16:05:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233484AbhEEQGQ (ORCPT ); Wed, 5 May 2021 12:06:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233708AbhEEQGP (ORCPT ); Wed, 5 May 2021 12:06:15 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D080C061574; Wed, 5 May 2021 09:05:19 -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=jPCNwLjCwwQAbTC1RHddm3f3nvTcQdsxJ2NVdh6ouWA=; b=cfoSv8qclcCDE0I17evVlPGiIN TRURmhsUuXKB5zBTHnhXRgQqw9I5t3sUPbOofM0ScQJdWzOdkBmXvc1zr5HQ64krjWOeSTm3AUyvJ PQo4jv+j/eWw30ODJJe4iSrP8gSxcgerfgZEbU/FlbbPEtNKI0cRrLDlZLIr8Az6997CPjeQ6beVy nKSA8nvlnXQp+7XtyB8wTbJjSi3V++o/R7iyOoj06Y14FBEw5ULFRs3osYLsQKSbvt7Boi62YtDzl s9NPFVCQmffcgTYyJKUiKS183SLgFQEApruXysUneGsQw6INs/0Ux3npsbz5JIsrHSWnU3BA4SUYu IpQeRwtQ==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1leJzx-000YmZ-IR; Wed, 05 May 2021 16:04:14 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v9 46/96] mm: Add flush_dcache_folio Date: Wed, 5 May 2021 16:05:38 +0100 Message-Id: <20210505150628.111735-47-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210505150628.111735-1-willy@infradead.org> References: <20210505150628.111735-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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) --- Documentation/core-api/cachetlb.rst | 6 ++++++ include/asm-generic/cacheflush.h | 14 ++++++++++++++ 2 files changed, 20 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/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h index 4a674db4e1fa..0155357b840f 100644 --- a/include/asm-generic/cacheflush.h +++ b/include/asm-generic/cacheflush.h @@ -49,9 +49,23 @@ 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 +static inline void flush_dcache_folio(struct folio *folio) +{ + unsigned int n = folio_nr_pages(folio); + + do { + n--; + flush_dcache_page(nth_page(&folio->page, n)); + } while (n); +} +#endif #ifndef flush_dcache_mmap_lock static inline void flush_dcache_mmap_lock(struct address_space *mapping) -- 2.30.2