iommu: Add a few printk messages to group handling code

Write a message to the kernel log when a device is added or
removed from a group and add debug messages to group
allocation and release routines.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c31bfd0279794e551719972bcfce6717db2df9a1..755e4889046a7a5884b7171595ac320d2c0adcff 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -128,6 +128,8 @@ static void iommu_group_release(struct kobject *kobj)
 {
        struct iommu_group *group = to_iommu_group(kobj);
 
+       pr_debug("Releasing group %d\n", group->id);
+
        if (group->iommu_data_release)
                group->iommu_data_release(group->iommu_data);
 
@@ -207,6 +209,8 @@ again:
         */
        kobject_put(&group->kobj);
 
+       pr_debug("Allocated group %d\n", group->id);
+
        return group;
 }
 EXPORT_SYMBOL_GPL(iommu_group_alloc);
@@ -372,6 +376,9 @@ rename:
                                     IOMMU_GROUP_NOTIFY_ADD_DEVICE, dev);
 
        trace_add_device_to_group(group->id, dev);
+
+       pr_info("Adding device %s to group %d\n", dev_name(dev), group->id);
+
        return 0;
 }
 EXPORT_SYMBOL_GPL(iommu_group_add_device);
@@ -388,6 +395,8 @@ void iommu_group_remove_device(struct device *dev)
        struct iommu_group *group = dev->iommu_group;
        struct iommu_device *tmp_device, *device = NULL;
 
+       pr_info("Removing device %s from group %d\n", dev_name(dev), group->id);
+
        /* Pre-notify listeners that a device is being removed. */
        blocking_notifier_call_chain(&group->notifier,
                                     IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);