From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754213AbaLOPNd (ORCPT ); Mon, 15 Dec 2014 10:13:33 -0500 Received: from 8bytes.org ([81.169.241.247]:48619 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752328AbaLOPN3 (ORCPT ); Mon, 15 Dec 2014 10:13:29 -0500 From: Joerg Roedel To: Thomas Gleixner , Ingo Molnar , hpa@zytor.com, x86@kernel.org, Joerg Roedel , Jiang Liu , Borislav Petkov Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org Subject: [PATCH 0/5] Fix Intel IRQ remapping initialization order Date: Mon, 15 Dec 2014 16:13:19 +0100 Message-Id: <1418656404-28575-1-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, here is a patch-set against tip/x86/apic to fix an initialization order problem with the IRQ remapping code. The problem is in the ordering of the irq_remapping_prepare and irq_remapping_supported functions. Currently the call-order is irq_remapping_prepare -> irq_remapping_supported, so that 'prepare' can succeed but 'supported' fails, so that interrupt remapping gets initialized but not enabled. This causes a broken interrupt setup on affected systems (machines with an Intel IOMMU without, or broken, IRQ remapping support). The result are lost interrupts and a non-bootable system. Both functions do checks whether IRQ remapping can be enabled on the machine. The reason for this is that some checks rely on dmar_table_init() and thus have to be done in irq_remapping_prepare(). This patch-set moves all these checks into the irq_remapping_prepare() path with the right ordering and removes the irq_remapping_supported() function and its call-backs. This fixes the initializion order problem and simplifies the exported API from the IOMMU code. Please review. Thanks, Joerg Joerg Roedel (5): iommu/vt-d: Allocate IRQ remapping data structures only for all IOMMUs iommu/vt-d: Don't check for ecap_ir_support in intel_irq_remapping_supported iommu/vt-d: Move supported-checks to intel_prepare_irq_remapping() iommu/amd: Check for irq-remap support amd_iommu_prepare() iommu, x86, apic: Remove irq_remapping_supported() arch/x86/kernel/apic/apic.c | 5 --- drivers/iommu/amd_iommu.c | 1 - drivers/iommu/amd_iommu_init.c | 8 ++--- drivers/iommu/amd_iommu_proto.h | 1 - drivers/iommu/intel_irq_remapping.c | 62 +++++++++++++++++-------------------- drivers/iommu/irq_remapping.c | 11 ------- drivers/iommu/irq_remapping.h | 3 -- 7 files changed, 31 insertions(+), 60 deletions(-) -- 1.9.1