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Message-Id: <20230711010642.19707-7-baolu.lu@linux.intel.com>
Date: Tue, 11 Jul 2023 09:06:39 +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>,
iommu@...ts.linux.dev, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 6/9] iommu: Remove iommu_[un]register_device_fault_handler()
This pair of interfaces are not used anywhere in the tree. Remove it to
avoid dead code.
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
include/linux/iommu.h | 23 ---------
drivers/iommu/iommu-sva.h | 4 +-
drivers/iommu/io-pgfault.c | 6 +--
drivers/iommu/iommu.c | 96 --------------------------------------
4 files changed, 4 insertions(+), 125 deletions(-)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a00fb43b5e73..f10be6680f8a 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -198,7 +198,6 @@ struct iommu_page_response {
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
struct device *, unsigned long, int, void *);
-typedef int (*iommu_dev_fault_handler_t)(struct iommu_fault *, void *);
struct iommu_domain_geometry {
dma_addr_t aperture_start; /* First address that can be mapped */
@@ -538,14 +537,10 @@ struct iommu_fault_event {
/**
* struct iommu_fault_param - per-device IOMMU fault data
- * @handler: Callback function to handle IOMMU faults at device level
- * @data: handler private data
* @faults: holds the pending faults which needs response
* @lock: protect pending faults list
*/
struct iommu_fault_param {
- iommu_dev_fault_handler_t handler;
- void *data;
struct list_head faults;
struct mutex lock;
};
@@ -669,11 +664,6 @@ extern int iommu_group_for_each_dev(struct iommu_group *group, void *data,
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_register_device_fault_handler(struct device *dev,
- iommu_dev_fault_handler_t handler,
- void *data);
-
-extern int iommu_unregister_device_fault_handler(struct device *dev);
extern int iommu_report_device_fault(struct device *dev,
struct iommu_fault_event *evt);
@@ -1055,19 +1045,6 @@ static inline void iommu_group_put(struct iommu_group *group)
{
}
-static inline
-int iommu_register_device_fault_handler(struct device *dev,
- iommu_dev_fault_handler_t handler,
- void *data)
-{
- return -ENODEV;
-}
-
-static inline int iommu_unregister_device_fault_handler(struct device *dev)
-{
- return 0;
-}
-
static inline
int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
{
diff --git a/drivers/iommu/iommu-sva.h b/drivers/iommu/iommu-sva.h
index c848661c4e20..7b26224c536b 100644
--- a/drivers/iommu/iommu-sva.h
+++ b/drivers/iommu/iommu-sva.h
@@ -13,7 +13,7 @@ struct iommu_fault;
struct iopf_queue;
#ifdef CONFIG_IOMMU_SVA
-int iommu_queue_iopf(struct iommu_fault *fault, void *cookie);
+int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev);
int iopf_queue_add_device(struct iopf_queue *queue, struct device *dev);
int iopf_queue_remove_device(struct iopf_queue *queue,
@@ -26,7 +26,7 @@ enum iommu_page_response_code
iommu_sva_handle_iopf(struct iommu_fault *fault, struct device *dev, void *data);
#else /* CONFIG_IOMMU_SVA */
-static inline int iommu_queue_iopf(struct iommu_fault *fault, void *cookie)
+static inline int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev)
{
return -ENODEV;
}
diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c
index fa604e1b5c5c..1749e0869f2e 100644
--- a/drivers/iommu/io-pgfault.c
+++ b/drivers/iommu/io-pgfault.c
@@ -103,7 +103,7 @@ static void iopf_handler(struct work_struct *work)
/**
* iommu_queue_iopf - IO Page Fault handler
* @fault: fault event
- * @cookie: struct device, passed to iommu_register_device_fault_handler.
+ * @dev: struct device.
*
* Add a fault to the device workqueue, to be handled by mm.
*
@@ -140,14 +140,12 @@ static void iopf_handler(struct work_struct *work)
*
* Return: 0 on success and <0 on error.
*/
-int iommu_queue_iopf(struct iommu_fault *fault, void *cookie)
+int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev)
{
int ret;
struct iopf_group *group;
struct iopf_fault *iopf, *next;
struct iopf_device_param *iopf_param;
-
- struct device *dev = cookie;
struct dev_iommu *param = dev->iommu;
lockdep_assert_held(¶m->lock);
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8d1f0935ea71..fc5e9698b35c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1199,98 +1199,6 @@ void iommu_group_put(struct iommu_group *group)
}
EXPORT_SYMBOL_GPL(iommu_group_put);
-/**
- * iommu_register_device_fault_handler() - Register a device fault handler
- * @dev: the device
- * @handler: the fault handler
- * @data: private data passed as argument to the handler
- *
- * When an IOMMU fault event is received, this handler gets called with the
- * fault event and data as argument. The handler should return 0 on success. If
- * the fault is recoverable (IOMMU_FAULT_PAGE_REQ), the consumer should also
- * complete the fault by calling iommu_page_response() with one of the following
- * response code:
- * - IOMMU_PAGE_RESP_SUCCESS: retry the translation
- * - IOMMU_PAGE_RESP_INVALID: terminate the fault
- * - IOMMU_PAGE_RESP_FAILURE: terminate the fault and stop reporting
- * page faults if possible.
- *
- * Return 0 if the fault handler was installed successfully, or an error.
- */
-int iommu_register_device_fault_handler(struct device *dev,
- iommu_dev_fault_handler_t handler,
- void *data)
-{
- struct dev_iommu *param = dev->iommu;
- int ret = 0;
-
- if (!param)
- return -EINVAL;
-
- mutex_lock(¶m->lock);
- /* Only allow one fault handler registered for each device */
- if (param->fault_param) {
- ret = -EBUSY;
- goto done_unlock;
- }
-
- get_device(dev);
- param->fault_param = kzalloc(sizeof(*param->fault_param), GFP_KERNEL);
- if (!param->fault_param) {
- put_device(dev);
- ret = -ENOMEM;
- goto done_unlock;
- }
- param->fault_param->handler = handler;
- param->fault_param->data = data;
- mutex_init(¶m->fault_param->lock);
- INIT_LIST_HEAD(¶m->fault_param->faults);
-
-done_unlock:
- mutex_unlock(¶m->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iommu_register_device_fault_handler);
-
-/**
- * iommu_unregister_device_fault_handler() - Unregister the device fault handler
- * @dev: the device
- *
- * Remove the device fault handler installed with
- * iommu_register_device_fault_handler().
- *
- * Return 0 on success, or an error.
- */
-int iommu_unregister_device_fault_handler(struct device *dev)
-{
- struct dev_iommu *param = dev->iommu;
- int ret = 0;
-
- if (!param)
- return -EINVAL;
-
- mutex_lock(¶m->lock);
-
- if (!param->fault_param)
- goto unlock;
-
- /* we cannot unregister handler if there are pending faults */
- if (!list_empty(¶m->fault_param->faults)) {
- ret = -EBUSY;
- goto unlock;
- }
-
- kfree(param->fault_param);
- param->fault_param = NULL;
- put_device(dev);
-unlock:
- mutex_unlock(¶m->lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(iommu_unregister_device_fault_handler);
-
static int iommu_handle_io_pgfault(struct device *dev,
struct iommu_fault *fault)
{
@@ -1337,10 +1245,6 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
/* we only report device fault if there is a handler registered */
mutex_lock(¶m->lock);
fparam = param->fault_param;
- if (!fparam || !fparam->handler) {
- ret = -EINVAL;
- goto done_unlock;
- }
if (evt->fault.type == IOMMU_FAULT_PAGE_REQ &&
(evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) {
--
2.34.1
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