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Merge branch 'api-features' into arm/smmu

This commit is contained in:
Joerg Roedel 2019-04-26 17:11:46 +02:00
parent 26ac2b6ee6 26b25a2b98
commit d53bff888f
2 changed files with 340 additions and 0 deletions
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200
drivers/iommu/iommu.c
View File

@ -2039,3 +2039,203 @@ int iommu_fwspec_add_ids(struct device *dev, u32 *ids, int num_ids)
return 0;
}
EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);
/*
* Per device IOMMU features.
*/
bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (ops && ops->dev_has_feat)
return ops->dev_has_feat(dev, feat);
return false;
}
EXPORT_SYMBOL_GPL(iommu_dev_has_feature);
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (ops && ops->dev_enable_feat)
return ops->dev_enable_feat(dev, feat);
return -ENODEV;
}
EXPORT_SYMBOL_GPL(iommu_dev_enable_feature);
/*
* The device drivers should do the necessary cleanups before calling this.
* For example, before disabling the aux-domain feature, the device driver
* should detach all aux-domains. Otherwise, this will return -EBUSY.
*/
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (ops && ops->dev_disable_feat)
return ops->dev_disable_feat(dev, feat);
return -EBUSY;
}
EXPORT_SYMBOL_GPL(iommu_dev_disable_feature);
bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (ops && ops->dev_feat_enabled)
return ops->dev_feat_enabled(dev, feat);
return false;
}
EXPORT_SYMBOL_GPL(iommu_dev_feature_enabled);
/*
* Aux-domain specific attach/detach.
*
* Only works if iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX) returns
* true. Also, as long as domains are attached to a device through this
* interface, any tries to call iommu_attach_device() should fail
* (iommu_detach_device() can't fail, so we fail when trying to re-attach).
* This should make us safe against a device being attached to a guest as a
* whole while there are still pasid users on it (aux and sva).
*/
int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
{
int ret = -ENODEV;
if (domain->ops->aux_attach_dev)
ret = domain->ops->aux_attach_dev(domain, dev);
if (!ret)
trace_attach_device_to_domain(dev);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_aux_attach_device);
void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
{
if (domain->ops->aux_detach_dev) {
domain->ops->aux_detach_dev(domain, dev);
trace_detach_device_from_domain(dev);
}
}
EXPORT_SYMBOL_GPL(iommu_aux_detach_device);
int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
{
int ret = -ENODEV;
if (domain->ops->aux_get_pasid)
ret = domain->ops->aux_get_pasid(domain, dev);
return ret;
}
EXPORT_SYMBOL_GPL(iommu_aux_get_pasid);
/**
* iommu_sva_bind_device() - Bind a process address space to a device
* @dev: the device
* @mm: the mm to bind, caller must hold a reference to it
*
* Create a bond between device and address space, allowing the device to access
* the mm using the returned PASID. If a bond already exists between @device and
* @mm, it is returned and an additional reference is taken. Caller must call
* iommu_sva_unbind_device() to release each reference.
*
* iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to
* initialize the required SVA features.
*
* On error, returns an ERR_PTR value.
*/
struct iommu_sva *
iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
{
struct iommu_group *group;
struct iommu_sva *handle = ERR_PTR(-EINVAL);
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (!ops || !ops->sva_bind)
return ERR_PTR(-ENODEV);
group = iommu_group_get(dev);
if (!group)
return ERR_PTR(-ENODEV);
/* Ensure device count and domain don't change while we're binding */
mutex_lock(&group->mutex);
/*
* To keep things simple, SVA currently doesn't support IOMMU groups
* with more than one device. Existing SVA-capable systems are not
* affected by the problems that required IOMMU groups (lack of ACS
* isolation, device ID aliasing and other hardware issues).
*/
if (iommu_group_device_count(group) != 1)
goto out_unlock;
handle = ops->sva_bind(dev, mm, drvdata);
out_unlock:
mutex_unlock(&group->mutex);
iommu_group_put(group);
return handle;
}
EXPORT_SYMBOL_GPL(iommu_sva_bind_device);
/**
* iommu_sva_unbind_device() - Remove a bond created with iommu_sva_bind_device
* @handle: the handle returned by iommu_sva_bind_device()
*
* Put reference to a bond between device and address space. The device should
* not be issuing any more transaction for this PASID. All outstanding page
* requests for this PASID must have been flushed to the IOMMU.
*
* Returns 0 on success, or an error value
*/
void iommu_sva_unbind_device(struct iommu_sva *handle)
{
struct iommu_group *group;
struct device *dev = handle->dev;
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (!ops || !ops->sva_unbind)
return;
group = iommu_group_get(dev);
if (!group)
return;
mutex_lock(&group->mutex);
ops->sva_unbind(handle);
mutex_unlock(&group->mutex);
iommu_group_put(group);
}
EXPORT_SYMBOL_GPL(iommu_sva_unbind_device);
int iommu_sva_set_ops(struct iommu_sva *handle,
const struct iommu_sva_ops *sva_ops)
{
if (handle->ops && handle->ops != sva_ops)
return -EEXIST;
handle->ops = sva_ops;
return 0;
}
EXPORT_SYMBOL_GPL(iommu_sva_set_ops);
int iommu_sva_get_pasid(struct iommu_sva *handle)
{
const struct iommu_ops *ops = handle->dev->bus->iommu_ops;
if (!ops || !ops->sva_get_pasid)
return IOMMU_PASID_INVALID;
return ops->sva_get_pasid(handle);
}
EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);

140
include/linux/iommu.h
View File

@ -48,6 +48,7 @@ struct bus_type;
struct device;
struct iommu_domain;
struct notifier_block;
struct iommu_sva;
/* iommu fault flags */
#define IOMMU_FAULT_READ 0x0
@ -55,6 +56,8 @@ struct notifier_block;
typedef int (*iommu_fault_handler_t)(struct iommu_domain *,
struct device *, unsigned long, int, void *);
typedef int (*iommu_mm_exit_handler_t)(struct device *dev, struct iommu_sva *,
void *);
struct iommu_domain_geometry {
dma_addr_t aperture_start; /* First address that can be mapped */
@ -156,6 +159,33 @@ struct iommu_resv_region {
enum iommu_resv_type type;
};
/* Per device IOMMU features */
enum iommu_dev_features {
IOMMU_DEV_FEAT_AUX, /* Aux-domain feature */
IOMMU_DEV_FEAT_SVA, /* Shared Virtual Addresses */
};
#define IOMMU_PASID_INVALID (-1U)
/**
* struct iommu_sva_ops - device driver callbacks for an SVA context
*
* @mm_exit: called when the mm is about to be torn down by exit_mmap. After
* @mm_exit returns, the device must not issue any more transaction
* with the PASID given as argument.
*
* The @mm_exit handler is allowed to sleep. Be careful about the
* locks taken in @mm_exit, because they might lead to deadlocks if
* they are also held when dropping references to the mm. Consider the
* following call chain:
* mutex_lock(A); mmput(mm) -> exit_mm() -> @mm_exit() -> mutex_lock(A)
* Using mmput_async() prevents this scenario.
*
*/
struct iommu_sva_ops {
iommu_mm_exit_handler_t mm_exit;
};
#ifdef CONFIG_IOMMU_API
/**
@ -186,6 +216,14 @@ struct iommu_resv_region {
* @of_xlate: add OF master IDs to iommu grouping
* @is_attach_deferred: Check if domain attach should be deferred from iommu
* driver init to device driver init (default no)
* @dev_has/enable/disable_feat: per device entries to check/enable/disable
* iommu specific features.
* @dev_feat_enabled: check enabled feature
* @aux_attach/detach_dev: aux-domain specific attach/detach entries.
* @aux_get_pasid: get the pasid given an aux-domain
* @sva_bind: Bind process address space to device
* @sva_unbind: Unbind process address space from device
* @sva_get_pasid: Get PASID associated to a SVA handle
* @pgsize_bitmap: bitmap of all possible supported page sizes
*/
struct iommu_ops {
@ -230,6 +268,22 @@ struct iommu_ops {
int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
/* Per device IOMMU features */
bool (*dev_has_feat)(struct device *dev, enum iommu_dev_features f);
bool (*dev_feat_enabled)(struct device *dev, enum iommu_dev_features f);
int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
/* Aux-domain specific attach/detach entries */
int (*aux_attach_dev)(struct iommu_domain *domain, struct device *dev);
void (*aux_detach_dev)(struct iommu_domain *domain, struct device *dev);
int (*aux_get_pasid)(struct iommu_domain *domain, struct device *dev);
struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct *mm,
void *drvdata);
void (*sva_unbind)(struct iommu_sva *handle);
int (*sva_get_pasid)(struct iommu_sva *handle);
unsigned long pgsize_bitmap;
};
@ -400,6 +454,14 @@ struct iommu_fwspec {
/* ATS is supported */
#define IOMMU_FWSPEC_PCI_RC_ATS (1 << 0)
/**
* struct iommu_sva - handle to a device-mm bond
*/
struct iommu_sva {
struct device *dev;
const struct iommu_sva_ops *ops;
};
int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
const struct iommu_ops *ops);
void iommu_fwspec_free(struct device *dev);
@ -420,6 +482,22 @@ static inline void dev_iommu_fwspec_set(struct device *dev,
int iommu_probe_device(struct device *dev);
void iommu_release_device(struct device *dev);
bool iommu_dev_has_feature(struct device *dev, enum iommu_dev_features f);
int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
bool iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features f);
int iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev);
void iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev);
int iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev);
struct iommu_sva *iommu_sva_bind_device(struct device *dev,
struct mm_struct *mm,
void *drvdata);
void iommu_sva_unbind_device(struct iommu_sva *handle);
int iommu_sva_set_ops(struct iommu_sva *handle,
const struct iommu_sva_ops *ops);
int iommu_sva_get_pasid(struct iommu_sva *handle);
#else /* CONFIG_IOMMU_API */
struct iommu_ops {};
@ -704,6 +782,68 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode)
return NULL;
}
static inline bool
iommu_dev_has_feature(struct device *dev, enum iommu_dev_features feat)
{
return false;
}
static inline bool
iommu_dev_feature_enabled(struct device *dev, enum iommu_dev_features feat)
{
return false;
}
static inline int
iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
{
return -ENODEV;
}
static inline int
iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
{
return -ENODEV;
}
static inline int
iommu_aux_attach_device(struct iommu_domain *domain, struct device *dev)
{
return -ENODEV;
}
static inline void
iommu_aux_detach_device(struct iommu_domain *domain, struct device *dev)
{
}
static inline int
iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
{
return -ENODEV;
}
static inline struct iommu_sva *
iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void *drvdata)
{
return NULL;
}
static inline void iommu_sva_unbind_device(struct iommu_sva *handle)
{
}
static inline int iommu_sva_set_ops(struct iommu_sva *handle,
const struct iommu_sva_ops *ops)
{
return -EINVAL;
}
static inline int iommu_sva_get_pasid(struct iommu_sva *handle)
{
return IOMMU_PASID_INVALID;
}
#endif /* CONFIG_IOMMU_API */
#ifdef CONFIG_IOMMU_DEBUGFS