iommu: add iommu interface to set/get device configuration

ascend inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4L735
CVE: NA

-------------------------------------------------

This introduce support to set and get device configuration in iommu
private driver. For example, when the smmu mpam configuration need to be
set in the smmu driver, these interfaces will help.
Signed-off-by: NXingang Wang <wangxingang5@huawei.com>
Reviewed-by: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -4081,6 +4081,22 @@ static int arm_smmu_device_domain_type(struct device *dev)
 }
 #endif
 
+static int arm_smmu_device_get_config(struct device *dev, int type, void *data)
+{
+	switch (type) {
+	default:
+		return -EINVAL;
+	}
+}
+
+static int arm_smmu_device_set_config(struct device *dev, int type, void *data)
+{
+	switch (type) {
+	default:
+		return -EINVAL;
+	}
+}
+
 static struct iommu_ops arm_smmu_ops = {
 	.capable		= arm_smmu_capable,
 	.domain_alloc		= arm_smmu_domain_alloc,
@@ -4122,6 +4138,8 @@ static struct iommu_ops arm_smmu_ops = {
 #ifdef CONFIG_SMMU_BYPASS_DEV
 	.def_domain_type	= arm_smmu_device_domain_type,
 #endif
+	.dev_get_config		= arm_smmu_device_get_config,
+	.dev_set_config		= arm_smmu_device_set_config,
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 };
 

drivers/iommu/iommu.c

@@ -3567,3 +3567,25 @@ u32 iommu_sva_get_pasid(struct iommu_sva *handle)
 	return ops->sva_get_pasid(handle);
 }
 EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
+
+int iommu_dev_set_config(struct device *dev, int type, void *data)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+
+	if (ops && ops->dev_set_config)
+		return ops->dev_set_config(dev, type, data);
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(iommu_dev_set_config);
+
+int iommu_dev_get_config(struct device *dev, int type, void *data)
+{
+	const struct iommu_ops *ops = dev->bus->iommu_ops;
+
+	if (ops && ops->dev_get_config)
+		return ops->dev_get_config(dev, type, data);
+
+	return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(iommu_dev_get_config);

include/linux/iommu.h

@@ -348,6 +348,9 @@ struct iommu_ops {
 			      dma_addr_t giova, phys_addr_t gpa, size_t size);
 	void (*unbind_guest_msi)(struct iommu_domain *domain, dma_addr_t giova);
 
+	int (*dev_get_config)(struct device *dev, int type, void *data);
+	int (*dev_set_config)(struct device *dev, int type, void *data);
+
 	unsigned long pgsize_bitmap;
 	struct module *owner;
 };
@@ -584,6 +587,9 @@ extern int iommu_clear_dirty_log(struct iommu_domain *domain, unsigned long iova
 				 unsigned long base_iova,
 				 unsigned long bitmap_pgshift);
 
+extern int iommu_dev_set_config(struct device *dev, int type, void *data);
+extern int iommu_dev_get_config(struct device *dev, int type, void *data);
+
 /* Window handling function prototypes */
 extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
 				      phys_addr_t offset, u64 size,
@@ -1215,6 +1221,18 @@ int iommu_bind_guest_msi(struct iommu_domain *domain,
 static inline
 void iommu_unbind_guest_msi(struct iommu_domain *domain, dma_addr_t giova) {}
 
+static inline
+int iommu_dev_set_config(struct device *dev, int type, void *data)
+{
+	return -ENODEV;
+}
+
+static inline
+int iommmu_dev_get_config(struct device *dev, int type, void *data)
+{
+	return -ENODEV;
+}
+
 #endif /* CONFIG_IOMMU_API */
 
 /**