[PATCH v3 09/34] iommu: Keep a list of allocated groups in __iommu_probe_device()

Joerg Roedel
2020-04-29T13:38:00Z

This is needed to defer default_domain allocation for new IOMMU groups
until all devices have been added to the group.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/iommu.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7a385c18e1a5..18eb3623bd00 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -44,6 +44,7 @@ struct iommu_group {
int id;
struct iommu_domain *default_domain;
struct iommu_domain *domain;
+ struct list_head entry;
};

struct group_device {
@@ -184,7 +185,7 @@ static void dev_iommu_free(struct device *dev)
dev->iommu = NULL;
}

-static int __iommu_probe_device(struct device *dev)
+static int __iommu_probe_device(struct device *dev, struct list_head *group_list)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
struct iommu_device *iommu_dev;
@@ -204,6 +205,9 @@ static int __iommu_probe_device(struct device *dev)
}
iommu_group_put(group);

+ if (group_list && !group->default_domain && list_empty(&group->entry))
+ list_add_tail(&group->entry, group_list);
+
iommu_device_link(iommu_dev, dev);

return 0;
@@ -234,7 +238,7 @@ int iommu_probe_device(struct device *dev)
if (ops->probe_device) {
struct iommu_group *group;

- ret = __iommu_probe_device(dev);
+ ret = __iommu_probe_device(dev, NULL);

/*
* Try to allocate a default domain - needs support from the
@@ -567,6 +571,7 @@ struct iommu_group *iommu_group_alloc(void)
group->kobj.kset = iommu_group_kset;
mutex_init(&group->mutex);
INIT_LIST_HEAD(&group->devices);
+ INIT_LIST_HEAD(&group->entry);
BLOCKING_INIT_NOTIFIER_HEAD(&group->notifier);

ret = ida_simple_get(&iommu_group_ida, 0, 0, GFP_KERNEL);