From patchwork Mon Feb 14 02:30:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anshuman Khandual X-Patchwork-Id: 12744824 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B1276C43217 for ; Mon, 14 Feb 2022 02:32:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=D+2LRoaEQPx3LCUFhHijbQgk48+Ca1nyFKd8Fs/RTdI=; b=4CoSKE1aXtF9Kc WOR5Zj1oya1x7hMAt/v0d+sqVr22FJJXiUrrCnjN/2r/9E7EgmAz1G4k6AT5/7LEV3whpKvuQWuY+ 1qMWTXCKopxHZhvdvG2+BiS6uh/dFdKEu0/vU/1mzeXVrZpOKWgng+KFLz4965VwRyDo2DrRYFeOe rvg6bQg4SlKpg3U2tXMWxTasGNipqzMAXGLyP3nDqZVCGlwYRyr2M4pU9D4tL2Z1e7w80X/7FD02/ JT47P4ug6aEUaLQeS2OtFNy6OvlJCAdN42b8FWDc4XZi8ewJXsg00GdL2VA29AhMaO6GUmOwhSZa5 brPOC1u6J7YYrgba2BTA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJR9d-00D0ZP-8c; Mon, 14 Feb 2022 02:31:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJR9Z-00D0XD-KY for linux-riscv@lists.infradead.org; Mon, 14 Feb 2022 02:31:51 +0000 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 DC340106F; Sun, 13 Feb 2022 18:31:48 -0800 (PST) Received: from p8cg001049571a15.arm.com (unknown [10.163.47.15]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 218233F718; Sun, 13 Feb 2022 18:31:45 -0800 (PST) From: Anshuman Khandual To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Anshuman Khandual , Christoph Hellwig , Andrew Morton , linux-arch@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org Subject: [PATCH 15/30] riscv/mm: Enable ARCH_HAS_VM_GET_PAGE_PROT Date: Mon, 14 Feb 2022 08:00:38 +0530 Message-Id: <1644805853-21338-16-git-send-email-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1644805853-21338-1-git-send-email-anshuman.khandual@arm.com> References: <1644805853-21338-1-git-send-email-anshuman.khandual@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220213_183149_777013_AC286024 X-CRM114-Status: GOOD ( 10.47 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.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: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/pgtable.h | 16 ------------ arch/riscv/mm/init.c | 42 ++++++++++++++++++++++++++++++++ 3 files changed, 43 insertions(+), 16 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 5adcbd9b5e88..9391742f9286 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -31,6 +31,7 @@ config RISCV select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN_SANITIZE_ALL + select ARCH_HAS_VM_GET_PAGE_PROT select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT select ARCH_STACKWALK diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 7e949f25c933..d2bb14cac28b 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -183,24 +183,8 @@ extern struct pt_alloc_ops pt_ops __initdata; extern pgd_t swapper_pg_dir[]; /* MAP_PRIVATE permissions: xwr (copy-on-write) */ -#define __P000 PAGE_NONE -#define __P001 PAGE_READ -#define __P010 PAGE_COPY -#define __P011 PAGE_COPY -#define __P100 PAGE_EXEC -#define __P101 PAGE_READ_EXEC -#define __P110 PAGE_COPY_EXEC -#define __P111 PAGE_COPY_READ_EXEC /* MAP_SHARED permissions: xwr */ -#define __S000 PAGE_NONE -#define __S001 PAGE_READ -#define __S010 PAGE_SHARED -#define __S011 PAGE_SHARED -#define __S100 PAGE_EXEC -#define __S101 PAGE_READ_EXEC -#define __S110 PAGE_SHARED_EXEC -#define __S111 PAGE_SHARED_EXEC #ifdef CONFIG_TRANSPARENT_HUGEPAGE static inline int pmd_present(pmd_t pmd) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index cf4d018b7d66..ed4a26422555 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -1048,3 +1048,45 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, return vmemmap_populate_basepages(start, end, node, NULL); } #endif + +#ifdef CONFIG_MMU +pgprot_t vm_get_page_prot(unsigned long vm_flags) +{ + switch (vm_flags & (VM_READ | VM_WRITE | VM_EXEC | VM_SHARED)) { + /* MAP_PRIVATE permissions: xwr (copy-on-write) */ + case VM_NONE: + return PAGE_NONE; + case VM_READ: + return PAGE_READ; + case VM_WRITE: + case VM_WRITE | VM_READ: + return PAGE_COPY; + case VM_EXEC: + return PAGE_EXEC; + case VM_EXEC | VM_READ: + return PAGE_READ_EXEC; + case VM_EXEC | VM_WRITE: + return PAGE_COPY_EXEC; + case VM_EXEC | VM_WRITE | VM_READ: + return PAGE_COPY_READ_EXEC; + /* MAP_SHARED permissions: xwr */ + case VM_SHARED: + return PAGE_NONE; + case VM_SHARED | VM_READ: + return PAGE_READ; + case VM_SHARED | VM_WRITE: + case VM_SHARED | VM_WRITE | VM_READ: + return PAGE_SHARED; + case VM_SHARED | VM_EXEC: + return PAGE_EXEC; + case VM_SHARED | VM_EXEC | VM_READ: + return PAGE_READ_EXEC; + case VM_SHARED | VM_EXEC | VM_WRITE: + case VM_SHARED | VM_EXEC | VM_WRITE | VM_READ: + return PAGE_SHARED_EXEC; + default: + BUILD_BUG(); + } +} +EXPORT_SYMBOL(vm_get_page_prot); +#endif /* CONFIG_MMU */