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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 1B6A5C282D8 for ; Wed, 30 Jan 2019 12:34:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF45121473 for ; Wed, 30 Jan 2019 12:34:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548851640; bh=MdJiXY8ibrN6WYl5P0Xf6iI38JFQ6fe6kQM8fKQPZR4=; h=From:To:Cc:Subject:Date:List-ID:From; b=iSAyrOv9jMMZTnEtsU9uhfRf5lDCcpBmJkDFUa2WqLG8OJuVGjUmBFH5xb7isRjDy Rhk7RnuDWJijuXz13U7eoTcJUaLRLocfSmPNG5gXw7RPYk2YSZ5gOdMfkhlXU0JDh3 s6mFpyIWb4nfhBz04lJaN5hLKBXmsb2Ce4Crmuzs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730847AbfA3Md7 (ORCPT ); Wed, 30 Jan 2019 07:33:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:45318 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725768AbfA3Md7 (ORCPT ); Wed, 30 Jan 2019 07:33:59 -0500 Received: from localhost.localdomain (unknown [60.186.218.186]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BCE2D20882; Wed, 30 Jan 2019 12:33:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548851638; bh=MdJiXY8ibrN6WYl5P0Xf6iI38JFQ6fe6kQM8fKQPZR4=; h=From:To:Cc:Subject:Date:From; b=bTN5nd716RvRDK2zGHg6sYW9f6w2eTufUR+LClyng4pql1dm3953YBd/z5PpW789/ lXW66EuAK21YIjSTbBjMKYBC9//4ik6hP8IyDHamBPzmyEU2Q+v6vRV1RFZq3SslNj sq2LCBLwisQxB0176/4Bb12j8InWHKcAytrHVxIU= From: guoren@kernel.org To: arnd@arndb.de Cc: linux-kernel@vger.kernel.org, guoren@kernel.org, linux-arch@vger.kernel.org, xiaodong.fan@boyahualu.com, Guo Ren Subject: [PATCH] csky: Fixup io-range page attribute for mmap("/dev/mem") Date: Wed, 30 Jan 2019 20:33:49 +0800 Message-Id: <1548851629-9408-1-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guo Ren Some user space drivers need accessing IO address and IO remap need SO(strong order) page-attribute to make IO operation correct. So we need add SO-page-attr for all non-memory address. Signed-off-by: Guo Ren Reported-by: Fan Xiaodong --- arch/csky/include/asm/pgtable.h | 5 +++++ arch/csky/mm/ioremap.c | 14 ++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h index af7a7fa..dcea277 100644 --- a/arch/csky/include/asm/pgtable.h +++ b/arch/csky/include/asm/pgtable.h @@ -241,6 +241,11 @@ static inline pte_t pte_mkyoung(pte_t pte) #define pgd_index(address) ((address) >> PGDIR_SHIFT) +#define __HAVE_PHYS_MEM_ACCESS_PROT +struct file; +extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot); + /* * Macro to make mark a page protection value as "uncacheable". Note * that "protection" is really a misnomer here as the protection value diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c index cb7c03e..8473b6b 100644 --- a/arch/csky/mm/ioremap.c +++ b/arch/csky/mm/ioremap.c @@ -46,3 +46,17 @@ void iounmap(void __iomem *addr) vunmap((void *)((unsigned long)addr & PAGE_MASK)); } EXPORT_SYMBOL(iounmap); + +pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot) +{ + if (!pfn_valid(pfn)) { + vma_prot.pgprot |= _PAGE_SO; + return pgprot_noncached(vma_prot); + } else if (file->f_flags & O_SYNC) { + return pgprot_noncached(vma_prot); + } + + return vma_prot; +} +EXPORT_SYMBOL(phys_mem_access_prot); -- 2.7.4