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 BC6B2C48BD5 for ; Tue, 25 Jun 2019 14:38:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 91760215EA for ; Tue, 25 Jun 2019 14:38:39 +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="E9+L7K4k" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732025AbfFYOii (ORCPT ); Tue, 25 Jun 2019 10:38:38 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:52684 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731502AbfFYOh5 (ORCPT ); Tue, 25 Jun 2019 10:37:57 -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=Uev9P+r50vVpCL7nS/dekiTRo7rXCigRkpG+pJrAUCA=; b=E9+L7K4kE6JTbh7vmfjLu++Bdq JFW5Va2G2EXQmw9Ke1E0G6TXfr3GramuNSqnofY+5ruiQC7YMVyKckCqdLDCAejhVvPjjrzmC3s0K 5jHAOt+PTN56hNY/emDzcT8mibDyCDoxaAOkaMPNE1QZ+kHmuyCglsjWWDNoZG889qMzTCVo7xhQC zZPu+39bRGe7M4f49CxIPbGV6KNIgucjuElJ9zwUyvgo2x9WKT9ZGfcD3RhFXEL9DhOFYfLgYbf3h mDT0YYG8DgGySjHXpThwmT0xYCmOYqlSMO4BtE80cVWg8pT6o1QKaSG6Q9B6vUTdYj3GyxqYcvc6i IGm4eLNQ==; Received: from 213-225-6-159.nat.highway.a1.net ([213.225.6.159] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hfmZr-00080F-Ip; Tue, 25 Jun 2019 14:37:44 +0000 From: Christoph Hellwig To: Andrew Morton , 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, 25 Jun 2019 16:37:07 +0200 Message-Id: <20190625143715.1689-9-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190625143715.1689-1-hch@lst.de> References: <20190625143715.1689-1-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-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 Reviewed-by: Khalid Aziz --- 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