From patchwork Mon Feb 28 10:47:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 12762871 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1677AC433EF for ; Mon, 28 Feb 2022 10:54:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235006AbiB1KzN (ORCPT ); Mon, 28 Feb 2022 05:55:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235233AbiB1Kyk (ORCPT ); Mon, 28 Feb 2022 05:54:40 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 4344D5E155; Mon, 28 Feb 2022 02:52:18 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 10EEE11FB; Mon, 28 Feb 2022 02:52:18 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.47.185]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 863F03F73D; Mon, 28 Feb 2022 02:52:10 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, geert@linux-m68k.org, Anshuman Khandual , Christoph Hellwig , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org, linux-mips@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org, linux-alpha@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-csky@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-parisc@vger.kernel.org, openrisc@lists.librecores.org, linux-um@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-arch@vger.kernel.org, Dinh Nguyen Subject: [PATCH V3 25/30] nios2/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Date: Mon, 28 Feb 2022 16:17:48 +0530 Message-Id: <1646045273-9343-26-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1646045273-9343-1-git-send-email-anshuman.khandual@arm.com> References: <1646045273-9343-1-git-send-email-anshuman.khandual@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This defines and exports a platform specific custom vm_get_page_prot() via subscribing ARCH_HAS_VM_GET_PAGE_PROT. Subsequently all __SXXX and __PXXX macros can be dropped which are no longer needed. Cc: Dinh Nguyen Cc: linux-kernel@vger.kernel.org Acked-by: Dinh Nguyen Signed-off-by: Anshuman Khandual --- arch/nios2/Kconfig | 1 + arch/nios2/include/asm/pgtable.h | 24 ---------------- arch/nios2/mm/init.c | 47 ++++++++++++++++++++++++++++++++ 3 files changed, 48 insertions(+), 24 deletions(-) diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig index 33fd06f5fa41..85a58a357a3b 100644 --- a/arch/nios2/Kconfig +++ b/arch/nios2/Kconfig @@ -6,6 +6,7 @@ config NIOS2 select ARCH_HAS_SYNC_DMA_FOR_CPU select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_HAS_DMA_SET_UNCACHED + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_NO_SWAP select COMMON_CLK select TIMER_OF diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h index 4a995fa628ee..ba3f9822c0b3 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -34,30 +34,6 @@ struct mm_struct; ((x) ? _PAGE_EXEC : 0) | \ ((r) ? _PAGE_READ : 0) | \ ((w) ? _PAGE_WRITE : 0)) -/* - * These are the macros that generic kernel code needs - * (to populate protection_map[]) - */ - -/* Remove W bit on private pages for COW support */ -#define __P000 MKP(0, 0, 0) -#define __P001 MKP(0, 0, 1) -#define __P010 MKP(0, 0, 0) /* COW */ -#define __P011 MKP(0, 0, 1) /* COW */ -#define __P100 MKP(1, 0, 0) -#define __P101 MKP(1, 0, 1) -#define __P110 MKP(1, 0, 0) /* COW */ -#define __P111 MKP(1, 0, 1) /* COW */ - -/* Shared pages can have exact HW mapping */ -#define __S000 MKP(0, 0, 0) -#define __S001 MKP(0, 0, 1) -#define __S010 MKP(0, 1, 0) -#define __S011 MKP(0, 1, 1) -#define __S100 MKP(1, 0, 0) -#define __S101 MKP(1, 0, 1) -#define __S110 MKP(1, 1, 0) -#define __S111 MKP(1, 1, 1) /* Used all over the kernel */ #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_CACHED | _PAGE_READ | \ diff --git a/arch/nios2/mm/init.c b/arch/nios2/mm/init.c index 613fcaa5988a..e867f5d85580 100644 --- a/arch/nios2/mm/init.c +++ b/arch/nios2/mm/init.c @@ -124,3 +124,50 @@ const char *arch_vma_name(struct vm_area_struct *vma) { return (vma->vm_start == KUSER_BASE) ? "[kuser]" : NULL; } + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { + /* Remove W bit on private pages for COW support */ + case VM_NONE: + return MKP(0, 0, 0); + case VM_READ: + return MKP(0, 0, 1); + /* COW */ + case VM_WRITE: + return MKP(0, 0, 0); + /* COW */ + case VM_WRITE | VM_READ: + return MKP(0, 0, 1); + case VM_EXEC: + return MKP(1, 0, 0); + case VM_EXEC | VM_READ: + return MKP(1, 0, 1); + /* COW */ + case VM_EXEC | VM_WRITE: + return MKP(1, 0, 0); + /* COW */ + case VM_EXEC | VM_WRITE | VM_READ: + return MKP(1, 0, 1); + /* Shared pages can have exact HW mapping */ + case VM_SHARED: + return MKP(0, 0, 0); + case VM_SHARED | VM_READ: + return MKP(0, 0, 1); + case VM_SHARED | VM_WRITE: + return MKP(0, 1, 0); + case VM_SHARED | VM_WRITE | VM_READ: + return MKP(0, 1, 1); + case VM_SHARED | VM_EXEC: + return MKP(1, 0, 0); + case VM_SHARED | VM_EXEC | VM_READ: + return MKP(1, 0, 1); + case VM_SHARED | VM_EXEC | VM_WRITE: + return MKP(1, 1, 0); + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ: + return MKP(1, 1, 1); + default: + BUILD_BUG(); + } +} +EXPORT_SYMBOL(vm_get_page_prot);