Merge branch 'amd-iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent

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