[PATCH v8 07/12] iommu: Merge iommu_fault_event and iopf_fault

Lu Baolu
2023-12-07T06:48:37Z

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@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Tested-by: Longfang Liu <liulongfang@huawei.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 6a74711dc47a..d0d120efce11 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);

@@ -1129,7 +1118,7 @@ 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 ce030c5b5772..c8cd5d4047e7 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -908,7 +908,7 @@ 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 0f33b212ca28..4e5fae4c3430 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 ac12f76c1212..1a37fefaf4fd 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -569,13 +569,12 @@ 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;
@@ -747,7 +746,7 @@ 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 4fda01de5589..10d48eb72608 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 9e2f399044bf..c7012a96adb3 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1330,10 +1330,10 @@ 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;

@@ -1346,7 +1346,7 @@ 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;
@@ -1375,7 +1375,7 @@ 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