From patchwork Mon May 11 09:52:47 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Zhen-Hua" X-Patchwork-Id: 6375471 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D9C9E9F1C2 for ; Mon, 11 May 2015 09:57:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1D8CE2025B for ; Mon, 11 May 2015 09:57:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0B8C20225 for ; Mon, 11 May 2015 09:57:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752853AbbEKJyU (ORCPT ); Mon, 11 May 2015 05:54:20 -0400 Received: from g2t1383g.austin.hp.com ([15.217.136.92]:51384 "EHLO g2t1383g.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752583AbbEKJyQ (ORCPT ); Mon, 11 May 2015 05:54:16 -0400 Received: from g2t2352.austin.hp.com (g2t2352.austin.hp.com [15.217.128.51]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by g2t1383g.austin.hp.com (Postfix) with ESMTPS id 060CE1F0C; Mon, 11 May 2015 09:54:16 +0000 (UTC) Received: from g2t2360.austin.hp.com (g2t2360.austin.hp.com [16.197.8.247]) by g2t2352.austin.hp.com (Postfix) with ESMTP id 4F79599; Mon, 11 May 2015 09:54:15 +0000 (UTC) Received: from piepie.asiapacific.hpqcorp.net (piepie.asiapacific.hpqcorp.net [16.187.246.216]) by g2t2360.austin.hp.com (Postfix) with ESMTP id EA7C246; Mon, 11 May 2015 09:54:09 +0000 (UTC) From: "Li, Zhen-Hua" To: , , , , , Cc: , , , , , , , , , , , , , , , Subject: [PATCH v11 03/10] iommu/vt-d: Function to get existing context entry Date: Mon, 11 May 2015 17:52:47 +0800 Message-Id: <1431337974-545-4-git-send-email-zhen-hual@hp.com> X-Mailer: git-send-email 2.0.0-rc0 In-Reply-To: <1431337974-545-1-git-send-email-zhen-hual@hp.com> References: <1431337974-545-1-git-send-email-zhen-hual@hp.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Interface for when a new domain in the old kernel needs some values from the panicked kernel's context entries. Signed-off-by: Li, Zhen-Hua --- drivers/iommu/intel-iommu.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 1e7ceb5..07e6118 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -367,6 +367,10 @@ static inline int first_pte_in_page(struct dma_pte *pte) * do the same thing as crashdump kernel. */ +static struct context_entry *device_to_existing_context_entry( + struct intel_iommu *iommu, + u8 bus, u8 devfn); + /* * This domain is a statically identity mapping domain. @@ -4810,3 +4814,22 @@ static void __init check_tylersburg_isoch(void) printk(KERN_WARNING "DMAR: Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n", vtisochctrl); } + +static struct context_entry *device_to_existing_context_entry( + struct intel_iommu *iommu, + u8 bus, u8 devfn) +{ + struct root_entry *root; + struct context_entry *context; + struct context_entry *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&iommu->lock, flags); + root = &iommu->root_entry[bus]; + context = get_context_addr_from_root(root); + if (context && context_present(context+devfn)) + ret = &context[devfn]; + spin_unlock_irqrestore(&iommu->lock, flags); + return ret; +} +