# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1246877838 -3600
# Node ID 0ab211e699e65310c10d90c29b29c8c1e083a4aa
# Parent ff5bc91d0057f4a37076f2393bbedfd62bdb1f0e
AMD IOMMU: Add suspend and resume support for amd iommu.
Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
---
xen/drivers/passthrough/amd/iommu_init.c | 80 +++++++++++++++++++++++++++++++
1 files changed, 80 insertions(+)
diff -r ff5bc91d0057 -r 0ab211e699e6 xen/drivers/passthrough/amd/iommu_init.c
--- a/xen/drivers/passthrough/amd/iommu_init.c Mon Jul 06 11:56:51 2009 +0100
+++ b/xen/drivers/passthrough/amd/iommu_init.c Mon Jul 06 11:57:18 2009 +0100
@@ -716,3 +716,83 @@ error_out:
}
return -ENOMEM;
}
+
+static void disable_iommu(struct amd_iommu *iommu)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+
+ if ( !iommu->enabled )
+ {
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ return;
+ }
+
+ amd_iommu_msi_enable(iommu, IOMMU_CONTROL_DISABLED);
+ set_iommu_command_buffer_control(iommu, IOMMU_CONTROL_DISABLED);
+ set_iommu_event_log_control(iommu, IOMMU_CONTROL_DISABLED);
+ set_iommu_translation_control(iommu, IOMMU_CONTROL_DISABLED);
+
+ iommu->enabled = 0;
+
+ spin_unlock_irqrestore(&iommu->lock, flags);
+
+}
+
+static void invalidate_all_domain_pages(void)
+{
+ struct domain *d;
+ for_each_domain( d )
+ invalidate_all_iommu_pages(d);
+}
+
+static void invalidate_all_devices(void)
+{
+ u16 bus, devfn, bdf, req_id;
+ unsigned long flags;
+ struct amd_iommu *iommu;
+
+ for ( bdf = 0; bdf < ivrs_bdf_entries; bdf++ )
+ {
+ bus = bdf >> 8;
+ devfn = bdf & 0xFF;
+ iommu = find_iommu_for_device(bus, devfn);
+ req_id = ivrs_mappings[bdf].dte_requestor_id;
+ if ( iommu )
+ {
+ spin_lock_irqsave(&iommu->lock, flags);
+ invalidate_dev_table_entry(iommu, req_id);
+ invalidate_interrupt_table(iommu, req_id);
+ flush_command_buffer(iommu);
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ }
+ }
+}
+
+void amd_iommu_suspend(void)
+{
+ struct amd_iommu *iommu;
+
+ for_each_amd_iommu ( iommu )
+ disable_iommu(iommu);
+}
+
+void amd_iommu_resume(void)
+{
+ struct amd_iommu *iommu;
+
+ for_each_amd_iommu ( iommu )
+ {
+ /*
+ * To make sure that iommus have not been touched
+ * before re-enablement
+ */
+ disable_iommu(iommu);
+ enable_iommu(iommu);
+ }
+
+ /* flush all cache entries after iommu re-enabled */
+ invalidate_all_devices();
+ invalidate_all_domain_pages();
+}
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