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iommu: Remove sva handle list

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The struct sva_iommu represents an association between an SVA domain and
a PASID of a device. It's stored in the iommu group's pasid array and also
tracked by a list in the per-mm data structure. Removes duplicate tracking
of sva_iommu by eliminating the list.

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>
Link: https://lore.kernel.org/r/20240702063444.105814-3-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Lu Baolu 2024-07-02 14:34:36 +08:00 committed by Will Deacon
parent 14678219cf
commit 3e7f57d1ef
4 changed files with 54 additions and 12 deletions
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3
drivers/iommu/iommu-priv.h
View File

@ -28,4 +28,7 @@ void iommu_device_unregister_bus(struct iommu_device *iommu,
const struct bus_type *bus,
struct notifier_block *nb);
struct iommu_attach_handle *iommu_attach_handle_get(struct iommu_group *group,
ioasid_t pasid,
unsigned int type);
#endif /* __LINUX_IOMMU_PRIV_H */

30
drivers/iommu/iommu-sva.c
View File

@ -41,7 +41,6 @@ static struct iommu_mm_data *iommu_alloc_mm_data(struct mm_struct *mm, struct de
}
iommu_mm->pasid = pasid;
INIT_LIST_HEAD(&iommu_mm->sva_domains);
INIT_LIST_HEAD(&iommu_mm->sva_handles);
/*
* Make sure the write to mm->iommu_mm is not reordered in front of
* initialization to iommu_mm fields. If it does, readers may see a
@ -69,11 +68,16 @@ static struct iommu_mm_data *iommu_alloc_mm_data(struct mm_struct *mm, struct de
*/
struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
{
struct iommu_group *group = dev->iommu_group;
struct iommu_attach_handle *attach_handle;
struct iommu_mm_data *iommu_mm;
struct iommu_domain *domain;
struct iommu_sva *handle;
int ret;
if (!group)
return ERR_PTR(-ENODEV);
mutex_lock(&iommu_sva_lock);
/* Allocate mm->pasid if necessary. */
@ -83,12 +87,22 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
goto out_unlock;
}
list_for_each_entry(handle, &mm->iommu_mm->sva_handles, handle_item) {
if (handle->dev == dev) {
refcount_inc(&handle->users);
mutex_unlock(&iommu_sva_lock);
return handle;
/* A bond already exists, just take a reference`. */
attach_handle = iommu_attach_handle_get(group, iommu_mm->pasid, IOMMU_DOMAIN_SVA);
if (!IS_ERR(attach_handle)) {
handle = container_of(attach_handle, struct iommu_sva, handle);
if (attach_handle->domain->mm != mm) {
ret = -EBUSY;
goto out_unlock;
}
refcount_inc(&handle->users);
mutex_unlock(&iommu_sva_lock);
return handle;
}
if (PTR_ERR(attach_handle) != -ENOENT) {
ret = PTR_ERR(attach_handle);
goto out_unlock;
}
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
@ -99,7 +113,6 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
/* Search for an existing domain. */
list_for_each_entry(domain, &mm->iommu_mm->sva_domains, next) {
handle->handle.domain = domain;
ret = iommu_attach_device_pasid(domain, dev, iommu_mm->pasid,
&handle->handle);
if (!ret) {
@ -115,7 +128,6 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
goto out_free_handle;
}
handle->handle.domain = domain;
ret = iommu_attach_device_pasid(domain, dev, iommu_mm->pasid,
&handle->handle);
if (ret)
@ -125,7 +137,6 @@ struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm
out:
refcount_set(&handle->users, 1);
list_add(&handle->handle_item, &mm->iommu_mm->sva_handles);
mutex_unlock(&iommu_sva_lock);
handle->dev = dev;
return handle;
@ -159,7 +170,6 @@ void iommu_sva_unbind_device(struct iommu_sva *handle)
mutex_unlock(&iommu_sva_lock);
return;
}
list_del(&handle->handle_item);
iommu_detach_device_pasid(domain, dev, iommu_mm->pasid);
if (--domain->users == 0) {

31
drivers/iommu/iommu.c
View File

@ -3486,3 +3486,34 @@ void iommu_free_global_pasid(ioasid_t pasid)
ida_free(&iommu_global_pasid_ida, pasid);
}
EXPORT_SYMBOL_GPL(iommu_free_global_pasid);
/**
* iommu_attach_handle_get - Return the attach handle
* @group: the iommu group that domain was attached to
* @pasid: the pasid within the group
* @type: matched domain type, 0 for any match
*
* Return handle or ERR_PTR(-ENOENT) on none, ERR_PTR(-EBUSY) on mismatch.
*
* Return the attach handle to the caller. The life cycle of an iommu attach
* handle is from the time when the domain is attached to the time when the
* domain is detached. Callers are required to synchronize the call of
* iommu_attach_handle_get() with domain attachment and detachment. The attach
* handle can only be used during its life cycle.
*/
struct iommu_attach_handle *
iommu_attach_handle_get(struct iommu_group *group, ioasid_t pasid, unsigned int type)
{
struct iommu_attach_handle *handle;
xa_lock(&group->pasid_array);
handle = xa_load(&group->pasid_array, pasid);
if (!handle)
handle = ERR_PTR(-ENOENT);
else if (type && handle->domain->type != type)
handle = ERR_PTR(-EBUSY);
xa_unlock(&group->pasid_array);
return handle;
}
EXPORT_SYMBOL_NS_GPL(iommu_attach_handle_get, IOMMUFD_INTERNAL);

2
include/linux/iommu.h
View File

@ -1005,14 +1005,12 @@ struct iommu_attach_handle {
struct iommu_sva {
struct iommu_attach_handle handle;
struct device *dev;
struct list_head handle_item;
refcount_t users;
};
struct iommu_mm_data {
u32 pasid;
struct list_head sva_domains;
struct list_head sva_handles;
};
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,