diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 9a2f1960873b..8d3e847d4845 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1615,6 +1615,46 @@ out: return ret; } +struct iommu_instance { + struct list_head list; + struct fwnode_handle *fwnode; + const struct iommu_ops *ops; +}; +static LIST_HEAD(iommu_instance_list); +static DEFINE_SPINLOCK(iommu_instance_lock); + +void iommu_register_instance(struct fwnode_handle *fwnode, + const struct iommu_ops *ops) +{ + struct iommu_instance *iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); + + if (WARN_ON(!iommu)) + return; + + of_node_get(to_of_node(fwnode)); + INIT_LIST_HEAD(&iommu->list); + iommu->fwnode = fwnode; + iommu->ops = ops; + spin_lock(&iommu_instance_lock); + list_add_tail(&iommu->list, &iommu_instance_list); + spin_unlock(&iommu_instance_lock); +} + +const struct iommu_ops *iommu_get_instance(struct fwnode_handle *fwnode) +{ + struct iommu_instance *instance; + const struct iommu_ops *ops = NULL; + + spin_lock(&iommu_instance_lock); + list_for_each_entry(instance, &iommu_instance_list, list) + if (instance->fwnode == fwnode) { + ops = instance->ops; + break; + } + spin_unlock(&iommu_instance_lock); + return ops; +} + int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops) { |