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amd-iommu: disable cmd buffer and evt logging before reprogramming iommu

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The IOMMU spec states that IOMMU behavior may be undefined when the
IOMMU registers are rewritten while command or event buffer is enabled.
Disable them in IOMMU disable path.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Chris Wright 2009-06-15 15:53:45 +02:00 • committed by Joerg Roedel
parent 42a49f965a
commit a8c485bb68
1 changed files with 9 additions and 0 deletions

9
arch/x86/kernel/amd_iommu_init.c
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@ -260,6 +260,14 @@ static void iommu_enable(struct amd_iommu *iommu)
static void iommu_disable(struct amd_iommu *iommu)
{
/* Disable command buffer */
iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
/* Disable event logging and event interrupts */
iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
/* Disable IOMMU hardware itself */
iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
}
@ -1042,6 +1050,7 @@ static void enable_iommus(void)
struct amd_iommu *iommu;
for_each_iommu(iommu) {
iommu_disable(iommu);
iommu_set_device_table(iommu);
iommu_enable_command_buffer(iommu);
iommu_enable_event_buffer(iommu);