linux-kernel - [PATCH 0/5] Fix Intel IRQ remapping initialization order

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Message-Id: <1418656404-28575-1-git-send-email-joro@8bytes.org>
Date:	Mon, 15 Dec 2014 16:13:19 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, hpa@...or.com, x86@...nel.org,
	Joerg Roedel <joro@...tes.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: [PATCH 0/5] Fix Intel IRQ remapping initialization order

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

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