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Subject[PATCH 02/22] iommu: Add a few printk messages to group handling code
Date
From: Joerg Roedel <jroedel@suse.de>

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>
---
drivers/iommu/iommu.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index c31bfd0..755e488 100644
--- 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);
--
1.9.1


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