From patchwork Sat Jun 1 07:49:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10971219 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A405518A6 for ; Sat, 1 Jun 2019 07:51:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9921328D34 for ; Sat, 1 Jun 2019 07:51:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8D75928D87; Sat, 1 Jun 2019 07:51:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3875128D34 for ; Sat, 1 Jun 2019 07:51:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727196AbfFAHuv (ORCPT ); Sat, 1 Jun 2019 03:50:51 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:51042 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726210AbfFAHuv (ORCPT ); Sat, 1 Jun 2019 03:50:51 -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=X2YVbgqGFpTprzpI9hgCNMZIAzqWGH+eXDnTmW0sVJU=; b=ZtJlig3VMwLrE3XBd3epSBCFB2 cZmqrWkQ/wKi02+ByfE4Vhsmik2Rj5BCC8ZLuKRSHBHIT5Q45EtH0aRHAtFwtRFtRhiDiZrjaAoA4 8RTsfsQ60cd74rPAkeo/Cn3/XAtwgId2fdhBRwTqwEu6GknlPe5g8YfZ+z77k2gCLpl24hX1VjjIC TnCIKT4Hf0cJ2uH1YJfG8fO3GBgKwmBtHVuYNOIMAEhwh3WpgrHqC4Nk44qGMziz/MuA1JaU90A/3 vFhqt1HRTaKMkCTuh8llBkmIaAlqI9ShNU0aucN01pOF2uvfFOHa+lDOaDgEu+Dn2ZOkDTe/8hAIA 6Vk5ptvQ==; Received: from 217-76-161-89.static.highway.a1.net ([217.76.161.89] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hWymj-0007nL-UH; Sat, 01 Jun 2019 07:50:38 +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 09/16] sparc64: define untagged_addr() Date: Sat, 1 Jun 2019 09:49:52 +0200 Message-Id: <20190601074959.14036-10-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190601074959.14036-1-hch@lst.de> References: <20190601074959.14036-1-hch@lst.de> MIME-Version: 1.0 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 X-Virus-Scanned: ClamAV using ClamSMTP 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 dcf970e82262..a93eca29e85a 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