select IOMMU_MM_DATA
bool
+config IOMMU_IOPF
+ bool
+
config FSL_PAMU
bool "Freescale IOMMU support"
depends on PCI
bool "Shared Virtual Addressing support for the ARM SMMUv3"
depends on ARM_SMMU_V3
select IOMMU_SVA
+ select IOMMU_IOPF
select MMU_NOTIFIER
help
Support for sharing process address spaces with devices using the
obj-$(CONFIG_S390_IOMMU) += s390-iommu.o
obj-$(CONFIG_HYPERV_IOMMU) += hyperv-iommu.o
obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
-obj-$(CONFIG_IOMMU_SVA) += iommu-sva.o io-pgfault.o
+obj-$(CONFIG_IOMMU_SVA) += iommu-sva.o
+obj-$(CONFIG_IOMMU_IOPF) += io-pgfault.o
obj-$(CONFIG_SPRD_IOMMU) += sprd-iommu.o
obj-$(CONFIG_APPLE_DART) += apple-dart.o
#include <linux/slab.h>
#include "arm-smmu-v3.h"
-#include "../../iommu-sva.h"
#include "../../io-pgtable-arm.h"
struct arm_smmu_mmu_notifier {
#include "arm-smmu-v3.h"
#include "../../dma-iommu.h"
-#include "../../iommu-sva.h"
static bool disable_bypass = true;
module_param(disable_bypass, bool, 0444);
depends on X86_64
select MMU_NOTIFIER
select IOMMU_SVA
+ select IOMMU_IOPF
help
Shared Virtual Memory (SVM) provides a facility for devices
to access DMA resources through process address space by
#include "iommu.h"
#include "../dma-iommu.h"
#include "../irq_remapping.h"
-#include "../iommu-sva.h"
#include "pasid.h"
#include "cap_audit.h"
#include "perfmon.h"
#include "iommu.h"
#include "pasid.h"
#include "perf.h"
-#include "../iommu-sva.h"
#include "trace.h"
static irqreturn_t prq_event_thread(int irq, void *d);
#include <linux/slab.h>
#include <linux/workqueue.h>
-#include "iommu-sva.h"
+#include "iommu-priv.h"
-enum iommu_page_response_code
-iommu_sva_handle_mm(struct iommu_fault *fault, struct mm_struct *mm);
-
-static void iopf_free_group(struct iopf_group *group)
+void iopf_free_group(struct iopf_group *group)
{
struct iopf_fault *iopf, *next;
kfree(group);
}
-
-static int iopf_complete_group(struct device *dev, struct iopf_fault *iopf,
- enum iommu_page_response_code status)
-{
- struct iommu_page_response resp = {
- .pasid = iopf->fault.prm.pasid,
- .grpid = iopf->fault.prm.grpid,
- .code = status,
- };
-
- if ((iopf->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID) &&
- (iopf->fault.prm.flags & IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID))
- resp.flags = IOMMU_PAGE_RESP_PASID_VALID;
-
- return iommu_page_response(dev, &resp);
-}
-
-static void iopf_handler(struct work_struct *work)
-{
- struct iopf_fault *iopf;
- struct iopf_group *group;
- enum iommu_page_response_code status = IOMMU_PAGE_RESP_SUCCESS;
-
- group = container_of(work, struct iopf_group, work);
- list_for_each_entry(iopf, &group->faults, list) {
- /*
- * For the moment, errors are sticky: don't handle subsequent
- * faults in the group if there is an error.
- */
- if (status != IOMMU_PAGE_RESP_SUCCESS)
- break;
-
- status = iommu_sva_handle_mm(&iopf->fault, group->domain->mm);
- }
-
- iopf_complete_group(group->dev, &group->last_fault, status);
- iopf_free_group(group);
-}
+EXPORT_SYMBOL_GPL(iopf_free_group);
static struct iommu_domain *get_domain_for_iopf(struct device *dev,
struct iommu_fault *fault)
}
/**
- * iommu_queue_iopf - IO Page Fault handler
+ * iommu_handle_iopf - IO Page Fault handler
* @fault: fault event
* @dev: struct device.
*
*
* Return: 0 on success and <0 on error.
*/
-int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev)
+static int iommu_handle_iopf(struct iommu_fault *fault, struct device *dev)
{
int ret;
struct iopf_group *group;
}
return ret;
}
-EXPORT_SYMBOL_GPL(iommu_queue_iopf);
-int iommu_sva_handle_iopf(struct iopf_group *group)
+/**
+ * iommu_report_device_fault() - Report fault event to device driver
+ * @dev: the device
+ * @evt: fault event data
+ *
+ * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ
+ * handler. When this function fails and the fault is recoverable, it is the
+ * caller's responsibility to complete the fault.
+ *
+ * Return 0 on success, or an error.
+ */
+int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
{
- struct iommu_fault_param *fault_param = group->dev->iommu->fault_param;
+ struct dev_iommu *param = dev->iommu;
+ struct iopf_fault *evt_pending = NULL;
+ struct iommu_fault_param *fparam;
+ int ret = 0;
- INIT_WORK(&group->work, iopf_handler);
- if (!queue_work(fault_param->queue->wq, &group->work))
- return -EBUSY;
+ if (!param || !evt)
+ return -EINVAL;
- return 0;
+ /* we only report device fault if there is a handler registered */
+ mutex_lock(¶m->lock);
+ fparam = param->fault_param;
+
+ if (evt->fault.type == IOMMU_FAULT_PAGE_REQ &&
+ (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) {
+ evt_pending = kmemdup(evt, sizeof(struct iopf_fault),
+ GFP_KERNEL);
+ if (!evt_pending) {
+ ret = -ENOMEM;
+ goto done_unlock;
+ }
+ mutex_lock(&fparam->lock);
+ list_add_tail(&evt_pending->list, &fparam->faults);
+ mutex_unlock(&fparam->lock);
+ }
+
+ ret = iommu_handle_iopf(&evt->fault, dev);
+ if (ret && evt_pending) {
+ mutex_lock(&fparam->lock);
+ list_del(&evt_pending->list);
+ mutex_unlock(&fparam->lock);
+ kfree(evt_pending);
+ }
+done_unlock:
+ mutex_unlock(¶m->lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iommu_report_device_fault);
+
+int iommu_page_response(struct device *dev,
+ struct iommu_page_response *msg)
+{
+ bool needs_pasid;
+ int ret = -EINVAL;
+ 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);
+ bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID;
+
+ if (!ops->page_response)
+ return -ENODEV;
+
+ if (!param || !param->fault_param)
+ return -EINVAL;
+
+ /* Only send response if there is a fault report pending */
+ mutex_lock(¶m->fault_param->lock);
+ if (list_empty(¶m->fault_param->faults)) {
+ dev_warn_ratelimited(dev, "no pending PRQ, drop response\n");
+ goto done_unlock;
+ }
+ /*
+ * Check if we have a matching page request pending to respond,
+ * otherwise return -EINVAL
+ */
+ list_for_each_entry(evt, ¶m->fault_param->faults, list) {
+ prm = &evt->fault.prm;
+ if (prm->grpid != msg->grpid)
+ continue;
+
+ /*
+ * If the PASID is required, the corresponding request is
+ * matched using the group ID, the PASID valid bit and the PASID
+ * value. Otherwise only the group ID matches request and
+ * response.
+ */
+ needs_pasid = prm->flags & IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID;
+ if (needs_pasid && (!has_pasid || msg->pasid != prm->pasid))
+ continue;
+
+ if (!needs_pasid && has_pasid) {
+ /* No big deal, just clear it. */
+ msg->flags &= ~IOMMU_PAGE_RESP_PASID_VALID;
+ msg->pasid = 0;
+ }
+
+ ret = ops->page_response(dev, evt, msg);
+ list_del(&evt->list);
+ kfree(evt);
+ break;
+ }
+
+done_unlock:
+ mutex_unlock(¶m->fault_param->lock);
+ return ret;
}
+EXPORT_SYMBOL_GPL(iommu_page_response);
/**
* iopf_queue_flush_dev - Ensure that all queued faults have been processed
}
EXPORT_SYMBOL_GPL(iopf_queue_flush_dev);
+/**
+ * iopf_group_response - Respond a group of page faults
+ * @group: the group of faults with the same group id
+ * @status: the response code
+ *
+ * Return 0 on success and <0 on error.
+ */
+int iopf_group_response(struct iopf_group *group,
+ enum iommu_page_response_code status)
+{
+ struct iopf_fault *iopf = &group->last_fault;
+ struct iommu_page_response resp = {
+ .pasid = iopf->fault.prm.pasid,
+ .grpid = iopf->fault.prm.grpid,
+ .code = status,
+ };
+
+ if ((iopf->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID) &&
+ (iopf->fault.prm.flags & IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID))
+ resp.flags = IOMMU_PAGE_RESP_PASID_VALID;
+
+ return iommu_page_response(group->dev, &resp);
+}
+EXPORT_SYMBOL_GPL(iopf_group_response);
+
/**
* iopf_queue_discard_partial - Remove all pending partial fault
* @queue: the queue whose partial faults need to be discarded
#include <linux/sched/mm.h>
#include <linux/iommu.h>
-#include "iommu-sva.h"
+#include "iommu-priv.h"
static DEFINE_MUTEX(iommu_sva_lock);
}
EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
+void mm_pasid_drop(struct mm_struct *mm)
+{
+ struct iommu_mm_data *iommu_mm = mm->iommu_mm;
+
+ if (!iommu_mm)
+ return;
+
+ iommu_free_global_pasid(iommu_mm->pasid);
+ kfree(iommu_mm);
+}
+
/*
* I/O page fault handler for SVA
*/
-enum iommu_page_response_code
+static enum iommu_page_response_code
iommu_sva_handle_mm(struct iommu_fault *fault, struct mm_struct *mm)
{
vm_fault_t ret;
return status;
}
-void mm_pasid_drop(struct mm_struct *mm)
+static void iommu_sva_handle_iopf(struct work_struct *work)
{
- struct iommu_mm_data *iommu_mm = mm->iommu_mm;
+ struct iopf_fault *iopf;
+ struct iopf_group *group;
+ enum iommu_page_response_code status = IOMMU_PAGE_RESP_SUCCESS;
+
+ group = container_of(work, struct iopf_group, work);
+ list_for_each_entry(iopf, &group->faults, list) {
+ /*
+ * For the moment, errors are sticky: don't handle subsequent
+ * faults in the group if there is an error.
+ */
+ if (status != IOMMU_PAGE_RESP_SUCCESS)
+ break;
+
+ status = iommu_sva_handle_mm(&iopf->fault, group->domain->mm);
+ }
- if (!iommu_mm)
- return;
+ iopf_group_response(group, status);
+ iopf_free_group(group);
+}
- iommu_free_global_pasid(iommu_mm->pasid);
- kfree(iommu_mm);
+static int iommu_sva_iopf_handler(struct iopf_group *group)
+{
+ struct iommu_fault_param *fault_param = group->dev->iommu->fault_param;
+
+ INIT_WORK(&group->work, iommu_sva_handle_iopf);
+ if (!queue_work(fault_param->queue->wq, &group->work))
+ return -EBUSY;
+
+ return 0;
+}
+
+struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
+ struct mm_struct *mm)
+{
+ const struct iommu_ops *ops = dev_iommu_ops(dev);
+ struct iommu_domain *domain;
+
+ domain = ops->domain_alloc(IOMMU_DOMAIN_SVA);
+ if (!domain)
+ return NULL;
+
+ domain->type = IOMMU_DOMAIN_SVA;
+ mmgrab(mm);
+ domain->mm = mm;
+ domain->owner = ops;
+ domain->iopf_handler = iommu_sva_iopf_handler;
+
+ return domain;
}
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * SVA library for IOMMU drivers
- */
-#ifndef _IOMMU_SVA_H
-#define _IOMMU_SVA_H
-
-#include <linux/mm_types.h>
-
-/* I/O Page fault */
-struct device;
-struct iommu_fault;
-struct iopf_queue;
-
-#ifdef CONFIG_IOMMU_SVA
-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,
- 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);
-int iommu_sva_handle_iopf(struct iopf_group *group);
-
-#else /* CONFIG_IOMMU_SVA */
-static inline int iommu_queue_iopf(struct iommu_fault *fault, struct device *dev)
-{
- return -ENODEV;
-}
-
-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 int iommu_sva_handle_iopf(struct iopf_group *group)
-{
- return IOMMU_PAGE_RESP_INVALID;
-}
-#endif /* CONFIG_IOMMU_SVA */
-#endif /* _IOMMU_SVA_H */
#include "dma-iommu.h"
#include "iommu-priv.h"
-#include "iommu-sva.h"
-
static struct kset *iommu_group_kset;
static DEFINE_IDA(iommu_group_ida);
static DEFINE_IDA(iommu_global_pasid_ida);
}
EXPORT_SYMBOL_GPL(iommu_group_put);
-/**
- * iommu_report_device_fault() - Report fault event to device driver
- * @dev: the device
- * @evt: fault event data
- *
- * Called by IOMMU drivers when a fault is detected, typically in a threaded IRQ
- * handler. When this function fails and the fault is recoverable, it is the
- * caller's responsibility to complete the fault.
- *
- * Return 0 on success, or an error.
- */
-int iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
-{
- struct dev_iommu *param = dev->iommu;
- struct iopf_fault *evt_pending = NULL;
- struct iommu_fault_param *fparam;
- int ret = 0;
-
- if (!param || !evt)
- return -EINVAL;
-
- /* we only report device fault if there is a handler registered */
- mutex_lock(¶m->lock);
- fparam = param->fault_param;
-
- if (evt->fault.type == IOMMU_FAULT_PAGE_REQ &&
- (evt->fault.prm.flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE)) {
- evt_pending = kmemdup(evt, sizeof(struct iopf_fault),
- GFP_KERNEL);
- if (!evt_pending) {
- ret = -ENOMEM;
- goto done_unlock;
- }
- mutex_lock(&fparam->lock);
- list_add_tail(&evt_pending->list, &fparam->faults);
- mutex_unlock(&fparam->lock);
- }
-
- ret = iommu_queue_iopf(&evt->fault, dev);
- if (ret && evt_pending) {
- mutex_lock(&fparam->lock);
- list_del(&evt_pending->list);
- mutex_unlock(&fparam->lock);
- kfree(evt_pending);
- }
-done_unlock:
- mutex_unlock(¶m->lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(iommu_report_device_fault);
-
-int iommu_page_response(struct device *dev,
- struct iommu_page_response *msg)
-{
- bool needs_pasid;
- int ret = -EINVAL;
- 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);
- bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID;
-
- if (!ops->page_response)
- return -ENODEV;
-
- if (!param || !param->fault_param)
- return -EINVAL;
-
- /* Only send response if there is a fault report pending */
- mutex_lock(¶m->fault_param->lock);
- if (list_empty(¶m->fault_param->faults)) {
- dev_warn_ratelimited(dev, "no pending PRQ, drop response\n");
- goto done_unlock;
- }
- /*
- * Check if we have a matching page request pending to respond,
- * otherwise return -EINVAL
- */
- list_for_each_entry(evt, ¶m->fault_param->faults, list) {
- prm = &evt->fault.prm;
- if (prm->grpid != msg->grpid)
- continue;
-
- /*
- * If the PASID is required, the corresponding request is
- * matched using the group ID, the PASID valid bit and the PASID
- * value. Otherwise only the group ID matches request and
- * response.
- */
- needs_pasid = prm->flags & IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID;
- if (needs_pasid && (!has_pasid || msg->pasid != prm->pasid))
- continue;
-
- if (!needs_pasid && has_pasid) {
- /* No big deal, just clear it. */
- msg->flags &= ~IOMMU_PAGE_RESP_PASID_VALID;
- msg->pasid = 0;
- }
-
- ret = ops->page_response(dev, evt, msg);
- list_del(&evt->list);
- kfree(evt);
- break;
- }
-
-done_unlock:
- mutex_unlock(¶m->fault_param->lock);
- return ret;
-}
-EXPORT_SYMBOL_GPL(iommu_page_response);
-
/**
* iommu_group_id - Return ID for a group
* @group: the group to ID
}
EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev_pasid);
-struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
- struct mm_struct *mm)
-{
- const struct iommu_ops *ops = dev_iommu_ops(dev);
- struct iommu_domain *domain;
-
- domain = ops->domain_alloc(IOMMU_DOMAIN_SVA);
- if (!domain)
- return NULL;
-
- domain->type = IOMMU_DOMAIN_SVA;
- mmgrab(mm);
- domain->mm = mm;
- domain->owner = ops;
- domain->iopf_handler = iommu_sva_handle_iopf;
- domain->fault_data = mm;
-
- return domain;
-}
-
ioasid_t iommu_alloc_global_pasid(struct device *dev)
{
int ret;
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 *);
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,
{
}
-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;
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)
{
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)
}
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 */
projects / thirdparty / kernel / linux.git / commitdiff
