From patchwork Sat Aug 7 08:04:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huang Pei X-Patchwork-Id: 493522 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=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 1F327C4320A for ; Sat, 7 Aug 2021 08:04:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F04C861179 for ; Sat, 7 Aug 2021 08:04:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231584AbhHGIEz (ORCPT ); Sat, 7 Aug 2021 04:04:55 -0400 Received: from mail.loongson.cn ([114.242.206.163]:33616 "EHLO loongson.cn" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S231543AbhHGIEz (ORCPT ); Sat, 7 Aug 2021 04:04:55 -0400 Received: from ambrosehua-HP-xw6600-Workstation.lan (unknown [125.69.44.6]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxH0KNPg5h_bEsAA--.26836S2; Sat, 07 Aug 2021 16:04:34 +0800 (CST) From: Huang Pei To: Thomas Bogendoerfer , ambrosehua@gmail.com Cc: Bibo Mao , linux-mips@vger.kernel.org, linux-rt-users@vger.kernel.org, Jiaxun Yang , Li Xuefeng , Yang Tiezhu , Gao Juxin , Huacai Chen , Jinyang He Subject: [PATCH] MIPS: simplify copy_user_high_page for MIPS64 w/o cache alias Date: Sat, 7 Aug 2021 16:04:29 +0800 Message-Id: <20210807080429.3323711-1-huangpei@loongson.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: AQAAf9DxH0KNPg5h_bEsAA--.26836S2 X-Coremail-Antispam: 1UD129KBjvJXoW7WF17AF1UKFWUKr1UGr1Dtrb_yoW8ur13pF 43Gw45KrWFgrW7C3Z3Xwsrury3Jas2yay8XF47Ka4Y9wnxWFy3XF1fXFW0qF1YqrWkGa15 W3yqgay5GF1Du3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9014x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Cr 1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj 6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr 0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7M4IIrI8v6xkF7I0E 8cxan2IY04v7MxkIecxEwVAFwVW8ZwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbV WUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF 67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42 IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6rWUJVWrZr1U MIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIda VFxhVjvjDU0xZFpf9x0JUhdbbUUUUU= X-CM-SenderInfo: xkxd0whshlqz5rrqw2lrqou0/ Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org Borrow from ARM64 MIPS64 CPU has enough direct mapped memory space to access all physical memory. In case of no cache alias, bypass both k*map_atomic and k*map_coherent for better real-time performance. Signed-off-by: Huang Pei --- arch/mips/mm/init.c | 39 ++++++++++++++++++++++++++------------- 1 file changed, 26 insertions(+), 13 deletions(-) diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 19347dc6bbf8..1f5bdd18ae7c 100644 --- a/arch/mips/mm/init.c +++ b/arch/mips/mm/init.c @@ -171,22 +171,35 @@ void copy_user_highpage(struct page *to, struct page *from, { void *vfrom, *vto; - vto = kmap_atomic(to); - if (cpu_has_dc_aliases && - page_mapcount(from) && !Page_dcache_dirty(from)) { - vfrom = kmap_coherent(from, vaddr); + if (IS_ENABLED(CONFIG_64BIT) && !cpu_has_dc_aliases) { + vfrom = page_address(from); + vto = page_address(to); copy_page(vto, vfrom); - kunmap_coherent(); + /* + * even without cache alias, still need to maintain + * coherence between icache and dcache + */ + if (!cpu_has_ic_fills_f_dc) + flush_data_cache_page((unsigned long)vto); + } else { - vfrom = kmap_atomic(from); - copy_page(vto, vfrom); - kunmap_atomic(vfrom); + vto = kmap_atomic(to); + if (cpu_has_dc_aliases && + page_mapcount(from) && !Page_dcache_dirty(from)) { + vfrom = kmap_coherent(from, vaddr); + copy_page(vto, vfrom); + kunmap_coherent(); + } else { + vfrom = kmap_atomic(from); + copy_page(vto, vfrom); + kunmap_atomic(vfrom); + } + if ((!cpu_has_ic_fills_f_dc) || + pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) + flush_data_cache_page((unsigned long)vto); + kunmap_atomic(vto); + /* Make sure this page is cleared on other CPU's too before using it */ } - if ((!cpu_has_ic_fills_f_dc) || - pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) - flush_data_cache_page((unsigned long)vto); - kunmap_atomic(vto); - /* Make sure this page is cleared on other CPU's too before using it */ smp_wmb(); }