@@ -1615,6 +1615,46 @@ int iommu_request_dm_for_dev(struct device *dev)
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)
{
@@ -96,45 +96,6 @@ int of_get_dma_window(struct device_node *dn, const char *prefix, int index,
}
EXPORT_SYMBOL_GPL(of_get_dma_window);
-struct of_iommu_node {
- struct list_head list;
- struct device_node *np;
- const struct iommu_ops *ops;
-};
-static LIST_HEAD(of_iommu_list);
-static DEFINE_SPINLOCK(of_iommu_lock);
-
-void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops)
-{
- struct of_iommu_node *iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
-
- if (WARN_ON(!iommu))
- return;
-
- of_node_get(np);
- INIT_LIST_HEAD(&iommu->list);
- iommu->np = np;
- iommu->ops = ops;
- spin_lock(&of_iommu_lock);
- list_add_tail(&iommu->list, &of_iommu_list);
- spin_unlock(&of_iommu_lock);
-}
-
-const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
-{
- struct of_iommu_node *node;
- const struct iommu_ops *ops = NULL;
-
- spin_lock(&of_iommu_lock);
- list_for_each_entry(node, &of_iommu_list, list)
- if (node->np == np) {
- ops = node->ops;
- break;
- }
- spin_unlock(&of_iommu_lock);
- return ops;
-}
-
static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
{
struct of_phandle_args *iommu_spec = data;
@@ -351,6 +351,9 @@ int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);
int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids);
+void iommu_register_instance(struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops);
+const struct iommu_ops *iommu_get_instance(struct fwnode_handle *fwnode);
#else /* CONFIG_IOMMU_API */
@@ -580,6 +583,17 @@ static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
return -ENODEV;
}
+static inline void iommu_register_instance(struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops)
+{
+}
+
+static inline
+const struct iommu_ops *iommu_get_instance(struct fwnode_handle *fwnode)
+{
+ return NULL;
+}
+
#endif /* CONFIG_IOMMU_API */
#endif /* __LINUX_IOMMU_H */
@@ -31,8 +31,16 @@ static inline const struct iommu_ops *of_iommu_configure(struct device *dev,
#endif /* CONFIG_OF_IOMMU */
-void of_iommu_set_ops(struct device_node *np, const struct iommu_ops *ops);
-const struct iommu_ops *of_iommu_get_ops(struct device_node *np);
+static inline void of_iommu_set_ops(struct device_node *np,
+ const struct iommu_ops *ops)
+{
+ iommu_register_instance(&np->fwnode, ops);
+}
+
+static inline const struct iommu_ops *of_iommu_get_ops(struct device_node *np)
+{
+ return iommu_get_instance(&np->fwnode);
+}
extern struct of_device_id __iommu_of_table;
The of_iommu_{set/get}_ops() API is used to associate a device tree node with a specific set of IOMMU operations. The same kernel interface is required on systems booting with ACPI, where devices are not associated with a device tree node, therefore the interface requires generalization. The struct device fwnode member represents the fwnode token associated with the device and the struct it points at is firmware specific; regardless, it is initialized on both ACPI and DT systems and makes an ideal candidate to use it to associate a set of IOMMU operations to a given device, through its struct device.fwnode member pointer, paving the way for representing per-device iommu_ops (ie an iommu instance associated with a device). Convert the DT specific of_iommu_{set/get}_ops() interface to use struct device.fwnode as a look-up token, making the interface usable on ACPI systems and rename the data structures and the registration API so that they are made to represent their usage more clearly. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Tomasz Nowicki <tn@semihalf.com> Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Tested-by: Tomasz Nowicki <tn@semihalf.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Joerg Roedel <joro@8bytes.org> --- drivers/iommu/iommu.c | 40 ++++++++++++++++++++++++++++++++++++++++ drivers/iommu/of_iommu.c | 39 --------------------------------------- include/linux/iommu.h | 14 ++++++++++++++ include/linux/of_iommu.h | 12 ++++++++++-- 4 files changed, 64 insertions(+), 41 deletions(-)