From patchwork Fri Apr 10 08:42:06 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: 460006 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E1471140281 for ; Fri, 10 Apr 2015 18:46:49 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932480AbbDJInf (ORCPT ); Fri, 10 Apr 2015 04:43:35 -0400 Received: from g2t1383g.austin.hp.com ([15.217.136.92]:36361 "EHLO g2t1383g.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932398AbbDJInc (ORCPT ); Fri, 10 Apr 2015 04:43:32 -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 169E1992; Fri, 10 Apr 2015 08:43:32 +0000 (UTC) Received: from g5t1633.atlanta.hp.com (g5t1633.atlanta.hp.com [16.201.144.132]) by g2t2352.austin.hp.com (Postfix) with ESMTP id D0FA488; Fri, 10 Apr 2015 08:43:28 +0000 (UTC) Received: from localhost.localdomain (linuxtest.chn.hp.com [16.155.255.10]) by g5t1633.atlanta.hp.com (Postfix) with ESMTP id C81FB5D; Fri, 10 Apr 2015 08:43:21 +0000 (UTC) From: "Li, Zhen-Hua" To: , , , , , Cc: , , , , , , , , , , , , , , , Subject: [PATCH v10 03/10] iommu/vt-d: Function to get old context entry Date: Fri, 10 Apr 2015 16:42:06 +0800 Message-Id: <1428655333-19504-4-git-send-email-zhen-hual@hp.com> X-Mailer: git-send-email 2.0.0-rc0 In-Reply-To: <1428655333-19504-1-git-send-email-zhen-hual@hp.com> References: <1428655333-19504-1-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 Interface for when a new domain in the crashdump kernel needs some values from the panicked kernel's context entries. Signed-off-by: Li, Zhen-Hua --- drivers/iommu/intel-iommu.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 735e28f..ff5ac04 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -369,6 +369,10 @@ static inline int first_pte_in_page(struct dma_pte *pte) */ +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. @@ -4793,3 +4797,23 @@ 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; + unsigned long flags; + + ret = NULL; + 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; +} +