Commit-ID: 09067207f6eacb7f00c8f7f0623c3696083ce042 Gitweb: http://git.kernel.org/tip/09067207f6eacb7f00c8f7f0623c3696083ce042 Author: Joerg Roedel <joerg.roedel@xxxxxxx> AuthorDate: Mon, 15 Jun 2009 16:06:48 +0200 Committer: Joerg Roedel <joerg.roedel@xxxxxxx> CommitDate: Mon, 15 Jun 2009 16:06:48 +0200 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@xxxxxxx> --- arch/x86/kernel/amd_iommu_init.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index 48a79b9..068a356 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -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); } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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