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amd-iommu: set event buffer head and tail to 0 manually 

These registers may contain values from previous kernels. So reset them
to known values before enable the event buffer again.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-06-15 16:06:48 +02:00
parent a8c485bb68
commit 09067207f6
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/amd_iommu_init.c
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@ -486,6 +486,10 @@ static void iommu_enable_event_buffer(struct amd_iommu *iommu)
memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
&entry, sizeof(entry));
/* set head and tail to zero manually */
writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
}