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@@ -486,6 +486,10 @@ static void iommu_enable_event_buffer(struct amd_iommu *iommu)
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memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
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&entry, sizeof(entry));
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+ /* set head and tail to zero manually */
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+ writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
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+ writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
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+
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iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
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}
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