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SubjectRe: [PATCH 3.2-stable] iommu/amd: Make sure IOMMU interrupts are re-enabled on resume
On Wed, Apr 11, 2012 at 06:25:46PM +0200, Joerg Roedel wrote:
> commit 9ddd592a191b32f2ee6c4b6ed2bd52665c3a49f5 upstream
>
> Unfortunatly the interrupts for the event log and the
> peripheral page-faults are only enabled at boot but not
> re-enabled at resume. Fix that for 3.2.

This is the correct fix for Linux 3.2:


From 2ff71db30bc4c1f46823a27f9d77bd2a19a9d238 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@amd.com>
Date: Thu, 15 Mar 2012 16:29:47 +0100
Subject: [PATCH v3.2-stable] iommu/amd: Make sure IOMMU interrupts are re-enabled on resume

commit 9ddd592a191b32f2ee6c4b6ed2bd52665c3a49f5 upstream

Unfortunatly the interrupts for the event log and the
peripheral page-faults are only enabled at boot but not
re-enabled at resume. Fix that for 3.2.

Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
drivers/iommu/amd_iommu_init.c | 24 +++++++++++++++++-------
1 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 5c74179..20d5852 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1033,8 +1033,9 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
{
int r;

- if (pci_enable_msi(iommu->dev))
- return 1;
+ r = pci_enable_msi(iommu->dev);
+ if (r)
+ return r;

r = request_threaded_irq(iommu->dev->irq,
amd_iommu_int_handler,
@@ -1044,24 +1045,33 @@ static int iommu_setup_msi(struct amd_iommu *iommu)

if (r) {
pci_disable_msi(iommu->dev);
- return 1;
+ return r;
}

iommu->int_enabled = true;
- iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);

return 0;
}

static int iommu_init_msi(struct amd_iommu *iommu)
{
+ int ret;
+
if (iommu->int_enabled)
- return 0;
+ goto enable_faults;

if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
- return iommu_setup_msi(iommu);
+ ret = iommu_setup_msi(iommu);
+ else
+ ret = -ENODEV;

- return 1;
+ if (ret)
+ return ret;
+
+enable_faults:
+ iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
+
+ return 0;
}

/****************************************************************************
--
1.7.5.4



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