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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C0158C433FE for ; Mon, 24 Jan 2022 12:59:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242839AbiAXM7F (ORCPT ); Mon, 24 Jan 2022 07:59:05 -0500 Received: from foss.arm.com ([217.140.110.172]:33216 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242838AbiAXM6w (ORCPT ); Mon, 24 Jan 2022 07:58:52 -0500 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 EE5EB113E; Mon, 24 Jan 2022 04:58:50 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.43.190]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D882F3F774; Mon, 24 Jan 2022 04:58:47 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, hch@infradead.org, akpm@linux-foundation.org, Anshuman Khandual , Dinh Nguyen Subject: [RFC V1 25/31] nios2/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Date: Mon, 24 Jan 2022 18:27:02 +0530 Message-Id: <1643029028-12710-26-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com> References: <1643029028-12710-1-git-send-email-anshuman.khandual@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 Signed-off-by: Anshuman Khandual --- arch/nios2/Kconfig | 1 + arch/nios2/include/asm/pgtable.h | 16 ------------- arch/nios2/mm/init.c | 41 ++++++++++++++++++++++++++++++++ 3 files changed, 42 insertions(+), 16 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..2678dad58a63 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -40,24 +40,8 @@ struct mm_struct; */ /* 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..4f8251e62f31 100644 --- a/arch/nios2/mm/init.c +++ b/arch/nios2/mm/init.c @@ -124,3 +124,44 @@ 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)) { + case VM_NONE: + return MKP(0, 0, 0); + case VM_READ: + return MKP(0, 0, 1); + case VM_WRITE: + return MKP(0, 0, 0); + case VM_READ | VM_WRITE: + return MKP(0, 0, 1); + case VM_EXEC: + return MKP(1, 0, 0); + case VM_EXEC | VM_READ: + return MKP(1, 0, 1); + case VM_EXEC | VM_WRITE: + return MKP(1, 0, 0); + case VM_EXEC | VM_READ | VM_WRITE: + return MKP(1, 0, 1); + 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_READ | VM_WRITE: + 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_READ | VM_WRITE: + return MKP(1, 1, 1); + default: + BUILD_BUG(); + } +} +EXPORT_SYMBOL(vm_get_page_prot); -- 2.25.1