iommu: Separate SVA and IOPF

Add CONFIG_IOMMU_IOPF for page fault handling framework and select it
from its real consumer. Move iopf function declaration from iommu-sva.h
to iommu.h and remove iommu-sva.h as it's empty now.

Consolidate all SVA related code into iommu-sva.c:
- Move iommu_sva_domain_alloc() from iommu.c to iommu-sva.c.
- Move sva iopf handling code from io-pgfault.c to iommu-sva.c.

Consolidate iommu_report_device_fault() and iommu_page_response() into
io-pgfault.c.

Export iopf_free_group() and iopf_group_response() for iopf handlers
implemented in modules. Some functions are renamed with more meaningful
names. No other intentional functionality changes.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Longfang Liu <liulongfang@huawei.com>
Link: https://lore.kernel.org/r/20240212012227.119381-11-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 74 insertions, 24 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 791f183a988e..fc912aed7886 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -810,10 +810,6 @@ extern struct iommu_group *iommu_group_get(struct device *dev);
 extern struct iommu_group *iommu_group_ref_get(struct iommu_group *group);
 extern void iommu_group_put(struct iommu_group *group);
 
-extern int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt);
-extern int iommu_page_response(struct device *dev,
-			       struct iommu_page_response *msg);
-
 extern int iommu_group_id(struct iommu_group *group);
 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 
@@ -1029,8 +1025,6 @@ bool iommu_group_dma_owner_claimed(struct iommu_group *group);
 int iommu_device_claim_dma_owner(struct device *dev, void *owner);
 void iommu_device_release_dma_owner(struct device *dev);
 
-struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
-					    struct mm_struct *mm);
 int iommu_attach_device_pasid(struct iommu_domain *domain,
 			      struct device *dev, ioasid_t pasid);
 void iommu_detach_device_pasid(struct iommu_domain *domain,
@@ -1219,18 +1213,6 @@ static inline void iommu_group_put(struct iommu_group *group)
 {
 }
 
-static inline
-int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
-{
-	return -ENODEV;
-}
-
-static inline int iommu_page_response(struct device *dev,
-				      struct iommu_page_response *msg)
-{
-	return -ENODEV;
-}
-
 static inline int iommu_group_id(struct iommu_group *group)
 {
 	return -ENODEV;
@@ -1379,12 +1361,6 @@ static inline int iommu_device_claim_dma_owner(struct device *dev, void *owner)
 	return -ENODEV;
 }
 
-static inline struct iommu_domain *
-iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
-{
-	return NULL;
-}
-
 static inline int iommu_attach_device_pasid(struct iommu_domain *domain,
 					    struct device *dev, ioasid_t pasid)
 {
@@ -1524,6 +1500,8 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev,
 					struct mm_struct *mm);
 void iommu_sva_unbind_device(struct iommu_sva *handle);
 u32 iommu_sva_get_pasid(struct iommu_sva *handle);
+struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
+					    struct mm_struct *mm);
 #else
 static inline struct iommu_sva *
 iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
@@ -1548,6 +1526,78 @@ static inline u32 mm_get_enqcmd_pasid(struct mm_struct *mm)
 }
 
 static inline void mm_pasid_drop(struct mm_struct *mm) {}
+
+static inline struct iommu_domain *
+iommu_sva_domain_alloc(struct device *dev, struct mm_struct *mm)
+{
+	return NULL;
+}
 #endif /* CONFIG_IOMMU_SVA */
 
+#ifdef CONFIG_IOMMU_IOPF
+int iopf_queue_add_device(struct iopf_queue *queue, struct device *dev);
+int iopf_queue_remove_device(struct iopf_queue *queue, struct device *dev);
+int iopf_queue_flush_dev(struct device *dev);
+struct iopf_queue *iopf_queue_alloc(const char *name);
+void iopf_queue_free(struct iopf_queue *queue);
+int iopf_queue_discard_partial(struct iopf_queue *queue);
+void iopf_free_group(struct iopf_group *group);
+int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt);
+int iommu_page_response(struct device *dev, struct iommu_page_response *msg);
+int iopf_group_response(struct iopf_group *group,
+			enum iommu_page_response_code status);
+#else
+static inline int
+iopf_queue_add_device(struct iopf_queue *queue, struct device *dev)
+{
+	return -ENODEV;
+}
+
+static inline int
+iopf_queue_remove_device(struct iopf_queue *queue, struct device *dev)
+{
+	return -ENODEV;
+}
+
+static inline int iopf_queue_flush_dev(struct device *dev)
+{
+	return -ENODEV;
+}
+
+static inline struct iopf_queue *iopf_queue_alloc(const char *name)
+{
+	return NULL;
+}
+
+static inline void iopf_queue_free(struct iopf_queue *queue)
+{
+}
+
+static inline int iopf_queue_discard_partial(struct iopf_queue *queue)
+{
+	return -ENODEV;
+}
+
+static inline void iopf_free_group(struct iopf_group *group)
+{
+}
+
+static inline int
+iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
+{
+	return -ENODEV;
+}
+
+static inline int
+iommu_page_response(struct device *dev, struct iommu_page_response *msg)
+{
+	return -ENODEV;
+}
+
+static inline int iopf_group_response(struct iopf_group *group,
+				      enum iommu_page_response_code status)
+{
+	return -ENODEV;
+}
+#endif /* CONFIG_IOMMU_IOPF */
 #endif /* __LINUX_IOMMU_H */