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| author | Joerg Roedel | 2009-06-15 16:06:48 +0200 |
|---|---|---|
| committer | Joerg Roedel | 2009-06-15 16:06:48 +0200 |
| commit | 09067207f6eacb7f00c8f7f0623c3696083ce042 (patch) | |
| tree | 96a9901b6f7164b773c89c65326bbc39ce46fa2d /arch/x86/kernel/amd_iommu_init.c | |
| parent | amd-iommu: disable cmd buffer and evt logging before reprogramming iommu (diff) | |
| download | kernel-qcow2-linux-09067207f6eacb7f00c8f7f0623c3696083ce042.tar.gz kernel-qcow2-linux-09067207f6eacb7f00c8f7f0623c3696083ce042.tar.xz kernel-qcow2-linux-09067207f6eacb7f00c8f7f0623c3696083ce042.zip | |
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>
Diffstat (limited to 'arch/x86/kernel/amd_iommu_init.c')
| -rw-r--r-- | 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 48a79b9b2f9e..068a3569f837 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); } |