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=-8.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 39EDCC43218 for ; Tue, 11 Jun 2019 14:41:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 08108208E3 for ; Tue, 11 Jun 2019 14:41:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lctxf60o" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391638AbfFKOln (ORCPT ); Tue, 11 Jun 2019 10:41:43 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:37580 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391528AbfFKOln (ORCPT ); Tue, 11 Jun 2019 10:41:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=YLjfzK43wQ9CU00al+Ym+V5yBUHCJAJzq91hYzEVV+8=; b=lctxf60o+qeZ56iUVs4sFHqM9g Bhl9Dv3SAKW713Ypki/OIDIOKgshgcusVFDaJY04xE9PEL+nj6W+vPTcq7JYNGL6xmdw2OKqVHSZA wJ6OQJcmfOFC0wdk6AGsIWyjU3jowYGGcpltD1WM9o0bAv+v5iEFLlAgDzcA9g64YCZnPb3LMbiPy wfa1Qmx12MM5qG3ouc5kp6B6jJ7pltFZOfe7Y+qDODepS8DylwA9QQ6maqbjNTcnhamI0AxDdQ8Jo bTNehbXDNjVFbP2iwArNFZoxouMJxnrPETVIANVvrT3NyE4+eQyNI4FET7Z9TwvgVWAqjvhPnaJEp KTHj52cQ==; Received: from mpp-cp1-natpool-1-037.ethz.ch ([82.130.71.37] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hahxr-0005RJ-A2; Tue, 11 Jun 2019 14:41:31 +0000 From: Christoph Hellwig To: Linus Torvalds , Paul Burton , James Hogan , Yoshinori Sato , Rich Felker , "David S. Miller" Cc: Nicholas Piggin , Khalid Aziz , Andrey Konovalov , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , linux-mips@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 08/16] sparc64: define untagged_addr() Date: Tue, 11 Jun 2019 16:40:54 +0200 Message-Id: <20190611144102.8848-9-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190611144102.8848-1-hch@lst.de> References: <20190611144102.8848-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Add a helper to untag a user pointer. This is needed for ADI support in get_user_pages_fast. Signed-off-by: Christoph Hellwig --- arch/sparc/include/asm/pgtable_64.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index f0dcf991d27f..1904782dcd39 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -1076,6 +1076,28 @@ static inline int io_remap_pfn_range(struct vm_area_struct *vma, } #define io_remap_pfn_range io_remap_pfn_range +static inline unsigned long untagged_addr(unsigned long start) +{ + if (adi_capable()) { + long addr = start; + + /* If userspace has passed a versioned address, kernel + * will not find it in the VMAs since it does not store + * the version tags in the list of VMAs. Storing version + * tags in list of VMAs is impractical since they can be + * changed any time from userspace without dropping into + * kernel. Any address search in VMAs will be done with + * non-versioned addresses. Ensure the ADI version bits + * are dropped here by sign extending the last bit before + * ADI bits. IOMMU does not implement version tags. + */ + return (addr << (long)adi_nbits()) >> (long)adi_nbits(); + } + + return start; +} +#define untagged_addr untagged_addr + #include #include -- 2.20.1