Merge tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg...

[linux-2.6-microblaze.git] / drivers / iommu / iommu.c

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b3f847b..10db680 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -30,6 +30,7 @@
 #include <linux/cc_platform.h>
 #include <trace/events/iommu.h>
 #include <linux/sched/mm.h>
+#include <linux/msi.h>
 
 #include "dma-iommu.h"
 
@@ -1904,6 +1905,29 @@ bool device_iommu_capable(struct device *dev, enum iommu_cap cap)
 }
 EXPORT_SYMBOL_GPL(device_iommu_capable);
 
+/**
+ * iommu_group_has_isolated_msi() - Compute msi_device_has_isolated_msi()
+ *       for a group
+ * @group: Group to query
+ *
+ * IOMMU groups should not have differing values of
+ * msi_device_has_isolated_msi() for devices in a group. However nothing
+ * directly prevents this, so ensure mistakes don't result in isolation failures
+ * by checking that all the devices are the same.
+ */
+bool iommu_group_has_isolated_msi(struct iommu_group *group)
+{
+       struct group_device *group_dev;
+       bool ret = true;
+
+       mutex_lock(&group->mutex);
+       list_for_each_entry(group_dev, &group->devices, list)
+               ret &= msi_device_has_isolated_msi(group_dev->dev);
+       mutex_unlock(&group->mutex);
+       return ret;
+}
+EXPORT_SYMBOL_GPL(iommu_group_has_isolated_msi);
+
 /**
  * iommu_set_fault_handler() - set a fault handler for an iommu domain
  * @domain: iommu domain