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Diffstat (limited to 'arch/x86/kernel/amd_iommu_init.c')
-rw-r--r--arch/x86/kernel/amd_iommu_init.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index b4b61d462dcc..c20001e4f556 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -240,7 +240,7 @@ static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
}
-static void __init iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
+static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
{
u32 ctrl;
@@ -519,6 +519,26 @@ static void set_dev_entry_bit(u16 devid, u8 bit)
amd_iommu_dev_table[devid].data[i] |= (1 << _bit);
}
+static int get_dev_entry_bit(u16 devid, u8 bit)
+{
+ int i = (bit >> 5) & 0x07;
+ int _bit = bit & 0x1f;
+
+ return (amd_iommu_dev_table[devid].data[i] & (1 << _bit)) >> _bit;
+}
+
+
+void amd_iommu_apply_erratum_63(u16 devid)
+{
+ int sysmgt;
+
+ sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) |
+ (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1);
+
+ if (sysmgt == 0x01)
+ set_dev_entry_bit(devid, DEV_ENTRY_IW);
+}
+
/* Writes the specific IOMMU for a device into the rlookup table */
static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
{
@@ -547,6 +567,8 @@ static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
if (flags & ACPI_DEVFLAG_LINT1)
set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
+ amd_iommu_apply_erratum_63(devid);
+
set_iommu_for_device(iommu, devid);
}