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path: root/arch/x86/kernel/amd_iommu_init.c
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Diffstat (limited to 'arch/x86/kernel/amd_iommu_init.c')
-rw-r--r--arch/x86/kernel/amd_iommu_init.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 238989ec077..10b2accd12e 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -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);
}
@@ -478,6 +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);
}
@@ -1042,6 +1054,7 @@ 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);
@@ -1066,12 +1079,6 @@ static void disable_iommus(void)
static int amd_iommu_resume(struct sys_device *dev)
{
- /*
- * Disable IOMMUs before reprogramming the hardware registers.
- * IOMMU is still enabled from the resume kernel.
- */
- disable_iommus();
-
/* re-load the hardware */
enable_iommus();
@@ -1079,8 +1086,8 @@ static int amd_iommu_resume(struct sys_device *dev)
* we have to flush after the IOMMUs are enabled because a
* disabled IOMMU will never execute the commands we send
*/
- amd_iommu_flush_all_domains();
amd_iommu_flush_all_devices();
+ amd_iommu_flush_all_domains();
return 0;
}
@@ -1273,6 +1280,11 @@ free:
goto out;
}
+void amd_iommu_shutdown(void)
+{
+ disable_iommus();
+}
+
/****************************************************************************
*
* Early detect code. This code runs at IOMMU detection time in the DMA