This is a note to let you know that I've just added the patch titled
iommu/amd: Re-enable IOMMU event log interrupt after handling.
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-amd-re-enable-iommu-event-log-interrupt-after-handling.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 925fe08bce38d1ff052fe2209b9e2b8d5fbb7f98 Mon Sep 17 00:00:00 2001
From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Date: Wed, 27 Mar 2013 18:51:52 -0500
Subject: iommu/amd: Re-enable IOMMU event log interrupt after handling.
From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
commit 925fe08bce38d1ff052fe2209b9e2b8d5fbb7f98 upstream.
Current driver does not clear the IOMMU event log interrupt bit
in the IOMMU status register after processing an interrupt.
This causes the IOMMU hardware to generate event log interrupt only once.
This has been observed in both IOMMU v1 and V2 hardware.
This patch clears the bit by writing 1 to bit 1 of the IOMMU
status register (MMIO Offset 2020h)
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Signed-off-by: Joerg Roedel <joro@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/amd_iommu.c | 3 +++
drivers/iommu/amd_iommu_types.h | 1 +
2 files changed, 4 insertions(+)
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -534,6 +534,9 @@ static void iommu_poll_events(struct amd
u32 head, tail;
unsigned long flags;
+ /* enable event interrupts again */
+ writel(MMIO_STATUS_EVT_INT_MASK, iommu->mmio_base + MMIO_STATUS_OFFSET);
+
spin_lock_irqsave(&iommu->lock, flags);
head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -99,6 +99,7 @@
#define PASID_MASK 0x000fffff
/* MMIO status bits */
+#define MMIO_STATUS_EVT_INT_MASK (1 << 1)
#define MMIO_STATUS_COM_WAIT_INT_MASK (1 << 2)
#define MMIO_STATUS_PPR_INT_MASK (1 << 6)
Patches currently in stable-queue which might be from suravee.suthikulpanit@xxxxxxx are
queue-3.4/iommu-amd-re-enable-iommu-event-log-interrupt-after-handling.patch
queue-3.4/iommu-amd-workaround-for-erbt1312.patch
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