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Date:   Wed, 15 Nov 2023 11:02:21 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kevin Tian <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
Cc:     Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Yan Zhao <yan.y.zhao@...el.com>, iommu@...ts.linux.dev,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v7 07/12] iommu: Merge iommu_fault_event and iopf_fault

The iommu_fault_event and iopf_fault data structures store the same
information about an iopf fault. They are also used in the same way.
Merge these two data structures into a single one to make the code
more concise and easier to maintain.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Tested-by: Yan Zhao <yan.y.zhao@...el.com>
---
 include/linux/iommu.h                       | 27 ++++++---------------
 drivers/iommu/intel/iommu.h                 |  2 +-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c |  4 +--
 drivers/iommu/intel/svm.c                   |  5 ++--
 drivers/iommu/io-pgfault.c                  |  5 ----
 drivers/iommu/iommu.c                       |  8 +++---
 6 files changed, 17 insertions(+), 34 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a45d92cc31ec..42b62bc8737a 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -40,7 +40,6 @@ struct iommu_domain_ops;
 struct iommu_dirty_ops;
 struct notifier_block;
 struct iommu_sva;
-struct iommu_fault_event;
 struct iommu_dma_cookie;
 struct iopf_queue;
 
@@ -121,6 +120,11 @@ struct iommu_page_response {
 	u32	code;
 };
 
+struct iopf_fault {
+	struct iommu_fault fault;
+	/* node for pending lists */
+	struct list_head list;
+};
 
 /* iommu fault flags */
 #define IOMMU_FAULT_READ	0x0
@@ -480,7 +484,7 @@ struct iommu_ops {
 	int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
 
 	int (*page_response)(struct device *dev,
-			     struct iommu_fault_event *evt,
+			     struct iopf_fault *evt,
 			     struct iommu_page_response *msg);
 
 	int (*def_domain_type)(struct device *dev);
@@ -572,20 +576,6 @@ struct iommu_device {
 	u32 max_pasids;
 };
 
-/**
- * struct iommu_fault_event - Generic fault event
- *
- * Can represent recoverable faults such as a page requests or
- * unrecoverable faults such as DMA or IRQ remapping faults.
- *
- * @fault: fault descriptor
- * @list: pending fault event list, used for tracking responses
- */
-struct iommu_fault_event {
-	struct iommu_fault fault;
-	struct list_head list;
-};
-
 /**
  * struct iommu_fault_param - per-device IOMMU fault data
  * @lock: protect pending faults list
@@ -720,8 +710,7 @@ 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 iommu_fault_event *evt);
+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);
 
@@ -1128,7 +1117,7 @@ static inline void iommu_group_put(struct iommu_group *group)
 }
 
 static inline
-int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
+int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
 {
 	return -ENODEV;
 }
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 65d37a138c75..a1ddd5132aae 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -905,7 +905,7 @@ struct iommu_domain *intel_nested_domain_alloc(struct iommu_domain *parent,
 void intel_svm_check(struct intel_iommu *iommu);
 int intel_svm_enable_prq(struct intel_iommu *iommu);
 int intel_svm_finish_prq(struct intel_iommu *iommu);
-int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
+int intel_svm_page_response(struct device *dev, struct iopf_fault *evt,
 			    struct iommu_page_response *msg);
 struct iommu_domain *intel_svm_domain_alloc(void);
 void intel_svm_remove_dev_pasid(struct device *dev, ioasid_t pasid);
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 505400538a2e..46780793b743 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -922,7 +922,7 @@ static int arm_smmu_cmdq_batch_submit(struct arm_smmu_device *smmu,
 }
 
 static int arm_smmu_page_response(struct device *dev,
-				  struct iommu_fault_event *unused,
+				  struct iopf_fault *unused,
 				  struct iommu_page_response *resp)
 {
 	struct arm_smmu_cmdq_ent cmd = {0};
@@ -1467,7 +1467,7 @@ static int arm_smmu_handle_evt(struct arm_smmu_device *smmu, u64 *evt)
 	struct arm_smmu_master *master;
 	bool ssid_valid = evt[0] & EVTQ_0_SSV;
 	u32 sid = FIELD_GET(EVTQ_0_SID, evt[0]);
-	struct iommu_fault_event fault_evt = { };
+	struct iopf_fault fault_evt = { };
 	struct iommu_fault *flt = &fault_evt.fault;
 
 	switch (FIELD_GET(EVTQ_0_ID, evt[0])) {
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 50a481c895b8..9de349ea215c 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -543,13 +543,12 @@ static int prq_to_iommu_prot(struct page_req_dsc *req)
 static int intel_svm_prq_report(struct intel_iommu *iommu, struct device *dev,
 				struct page_req_dsc *desc)
 {
-	struct iommu_fault_event event;
+	struct iopf_fault event = { };
 
 	if (!dev || !dev_is_pci(dev))
 		return -ENODEV;
 
 	/* Fill in event data for device specific processing */
-	memset(&event, 0, sizeof(struct iommu_fault_event));
 	event.fault.type = IOMMU_FAULT_PAGE_REQ;
 	event.fault.prm.addr = (u64)desc->addr << VTD_PAGE_SHIFT;
 	event.fault.prm.pasid = desc->pasid;
@@ -721,7 +720,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
 }
 
 int intel_svm_page_response(struct device *dev,
-			    struct iommu_fault_event *evt,
+			    struct iopf_fault *evt,
 			    struct iommu_page_response *msg)
 {
 	struct iommu_fault_page_request *prm;
diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c
index 31832aeacdba..c45977bb7da3 100644
--- a/drivers/iommu/io-pgfault.c
+++ b/drivers/iommu/io-pgfault.c
@@ -25,11 +25,6 @@ struct iopf_queue {
 	struct mutex			lock;
 };
 
-struct iopf_fault {
-	struct iommu_fault		fault;
-	struct list_head		list;
-};
-
 struct iopf_group {
 	struct iopf_fault		last_fault;
 	struct list_head		faults;
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0c6700b6659a..36b597bb8a09 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1312,10 +1312,10 @@ EXPORT_SYMBOL_GPL(iommu_group_put);
  *
  * Return 0 on success, or an error.
  */
-int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
+int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
 {
 	struct dev_iommu *param = dev->iommu;
-	struct iommu_fault_event *evt_pending = NULL;
+	struct iopf_fault *evt_pending = NULL;
 	struct iommu_fault_param *fparam;
 	int ret = 0;
 
@@ -1328,7 +1328,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
 
 	if (evt->fault.type == IOMMU_FAULT_PAGE_REQ &&
 	    (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) {
-		evt_pending = kmemdup(evt, sizeof(struct iommu_fault_event),
+		evt_pending = kmemdup(evt, sizeof(struct iopf_fault),
 				      GFP_KERNEL);
 		if (!evt_pending) {
 			ret = -ENOMEM;
@@ -1357,7 +1357,7 @@ int iommu_page_response(struct device *dev,
 {
 	bool needs_pasid;
 	int ret = -EINVAL;
-	struct iommu_fault_event *evt;
+	struct iopf_fault *evt;
 	struct iommu_fault_page_request *prm;
 	struct dev_iommu *param = dev->iommu;
 	const struct iommu_ops *ops = dev_iommu_ops(dev);
-- 
2.34.1

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