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| author |   Joerg Roedel <joerg.roedel@amd.com> | 2011-12-22 14:51:53 +0100 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-12-22 14:56:56 +0100 |
| commit | 1456e9d2c4667a6e9221eda27b9648fb3bcc1e8e (patch) | |
| tree | 6ef0a4f1ba7d25c97babd5a0f2a41db068150281 /drivers/iommu/amd_iommu_init.c | |
| parent | iommu/amd: Init stats for iommu=pt (diff) | |
| download | linux-dev-1456e9d2c4667a6e9221eda27b9648fb3bcc1e8e.tar.xz linux-dev-1456e9d2c4667a6e9221eda27b9648fb3bcc1e8e.zip | |
iommu/amd: Set IOTLB invalidation timeout
To protect the command buffer from hanging when a device
does not respond to an IOTLB invalidation, set a timeout of
1s for outstanding IOTLB invalidations.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 38784733cbb4..bdea288dc185 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -306,6 +306,16 @@ static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit) writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); } +static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout) +{ + u32 ctrl; + + ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET); + ctrl &= ~CTRL_INV_TO_MASK; + ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK; + writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); +} + /* Function to enable the hardware */ static void iommu_enable(struct amd_iommu *iommu) { @@ -1300,6 +1310,9 @@ static void iommu_init_flags(struct amd_iommu *iommu) * make IOMMU memory accesses cache coherent */ iommu_feature_enable(iommu, CONTROL_COHERENT_EN); + + /* Set IOTLB invalidation timeout to 1s */ + iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S); } static void iommu_apply_resume_quirks(struct amd_iommu *iommu) |