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Commit 09067207 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent a8c485bb

arch/x86/kernel/amd_iommu_init.c

+4 −0
Original line number Diff line number Diff line
@@ -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);

}