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 D26FDC433F5 for ; Thu, 7 Apr 2022 10:34:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244519AbiDGKgi (ORCPT ); Thu, 7 Apr 2022 06:36:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244434AbiDGKgM (ORCPT ); Thu, 7 Apr 2022 06:36:12 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0437C149254; Thu, 7 Apr 2022 03:32:55 -0700 (PDT) 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 B59371576; Thu, 7 Apr 2022 03:32:54 -0700 (PDT) Received: from a077893.arm.com (unknown [10.163.36.112]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 030373F5A1; Thu, 7 Apr 2022 03:32:49 -0700 (PDT) From: Anshuman Khandual To: linux-mm@kvack.org, akpm@linux-foundation.org Cc: Anshuman Khandual , Christoph Hellwig , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon Subject: [PATCH V4 3/7] arm64/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Date: Thu, 7 Apr 2022 16:02:47 +0530 Message-Id: <20220407103251.1209606-4-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220407103251.1209606-1-anshuman.khandual@arm.com> References: <20220407103251.1209606-1-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. It localizes arch_vm_get_page_prot() and moves it near vm_get_page_prot(). Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/mman.h | 24 ------------------------ arch/arm64/mm/mmap.c | 33 +++++++++++++++++++++++++++++++++ 3 files changed, 34 insertions(+), 24 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 57c4c995965f..dd0b15162bb3 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -45,6 +45,7 @@ config ARM64 select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_HAS_ZONE_DMA_SET if EXPERT select ARCH_HAVE_ELF_PROT select ARCH_HAVE_NMI_SAFE_CMPXCHG diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h index e3e28f7daf62..5966ee4a6154 100644 --- a/arch/arm64/include/asm/mman.h +++ b/arch/arm64/include/asm/mman.h @@ -35,30 +35,6 @@ static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags) } #define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(flags) -static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) -{ - pteval_t prot = 0; - - if (vm_flags & VM_ARM64_BTI) - prot |= PTE_GP; - - /* - * There are two conditions required for returning a Normal Tagged - * memory type: (1) the user requested it via PROT_MTE passed to - * mmap() or mprotect() and (2) the corresponding vma supports MTE. We - * register (1) as VM_MTE in the vma->vm_flags and (2) as - * VM_MTE_ALLOWED. Note that the latter can only be set during the - * mmap() call since mprotect() does not accept MAP_* flags. - * Checking for VM_MTE only is sufficient since arch_validate_flags() - * does not permit (VM_MTE & !VM_MTE_ALLOWED). - */ - if (vm_flags & VM_MTE) - prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED); - - return __pgprot(prot); -} -#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) - static inline bool arch_validate_prot(unsigned long prot, unsigned long addr __always_unused) { diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index 77ada00280d9..307534fcec00 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -55,3 +55,36 @@ static int __init adjust_protection_map(void) return 0; } arch_initcall(adjust_protection_map); + +static pgprot_t arm64_arch_vm_get_page_prot(unsigned long vm_flags) +{ + pteval_t prot = 0; + + if (vm_flags & VM_ARM64_BTI) + prot |= PTE_GP; + + /* + * There are two conditions required for returning a Normal Tagged + * memory type: (1) the user requested it via PROT_MTE passed to + * mmap() or mprotect() and (2) the corresponding vma supports MTE. We + * register (1) as VM_MTE in the vma->vm_flags and (2) as + * VM_MTE_ALLOWED. Note that the latter can only be set during the + * mmap() call since mprotect() does not accept MAP_* flags. + * Checking for VM_MTE only is sufficient since arch_validate_flags() + * does not permit (VM_MTE & !VM_MTE_ALLOWED). + */ + if (vm_flags & VM_MTE) + prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED); + + return __pgprot(prot); +} + +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + pgprot_t ret = __pgprot(pgprot_val(protection_map[vm_flags & + (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) | + pgprot_val(arm64_arch_vm_get_page_prot(vm_flags))); + + return ret; +} +EXPORT_SYMBOL(vm_get_page_prot); -- 2.25.1