| Message ID | 20220826121141.50743-14-baolu.lu@linux.intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | iommu: SVA and IOPF refactoring | expand |
在 2022/8/26 20:11, Lu Baolu 写道: > The existing iommu SVA interfaces are implemented by calling the SVA > specific iommu ops provided by the IOMMU drivers. There's no need for > any SVA specific ops in iommu_ops vector anymore as we can achieve > this through the generic attach/detach_dev_pasid domain ops. > > This refactors the IOMMU SVA interfaces implementation by using the > iommu_detach/detach_device_pasid interfaces and align them with the Did you mean using the iommu_attach/detach_device_pasid interfaces here? Thanks, Yuan Can > concept of the SVA iommu domain. Put the new SVA code in the SVA > related file in order to make it self-contained. > > Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> > Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > Reviewed-by: Kevin Tian <kevin.tian@intel.com> > Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> > Tested-by: Tony Zhu <tony.zhu@intel.com> > --- > include/linux/iommu.h | 43 ++++++------- > drivers/iommu/iommu-sva-lib.c | 110 ++++++++++++++++++++++++++++++++++ > drivers/iommu/iommu.c | 91 ---------------------------- > 3 files changed, 133 insertions(+), 111 deletions(-) > > diff --git a/include/linux/iommu.h b/include/linux/iommu.h > index 836aa480961c..5b1e0f81eebb 100644 > --- a/include/linux/iommu.h > +++ b/include/linux/iommu.h > @@ -643,6 +643,7 @@ struct iommu_fwspec { > */ > struct iommu_sva { > struct device *dev; > + struct iommu_domain *domain; > }; > > int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, > @@ -684,11 +685,6 @@ void iommu_release_device(struct device *dev); > 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); > > -struct iommu_sva *iommu_sva_bind_device(struct device *dev, > - struct mm_struct *mm); > -void iommu_sva_unbind_device(struct iommu_sva *handle); > -u32 iommu_sva_get_pasid(struct iommu_sva *handle); > - > int iommu_device_use_default_domain(struct device *dev); > void iommu_device_unuse_default_domain(struct device *dev); > > @@ -1029,21 +1025,6 @@ iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) > return -ENODEV; > } > > -static inline struct iommu_sva * > -iommu_sva_bind_device(struct device *dev, struct mm_struct *mm) > -{ > - return NULL; > -} > - > -static inline void iommu_sva_unbind_device(struct iommu_sva *handle) > -{ > -} > - > -static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle) > -{ > - return IOMMU_PASID_INVALID; > -} > - > static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) > { > return NULL; > @@ -1121,4 +1102,26 @@ void iommu_debugfs_setup(void); > static inline void iommu_debugfs_setup(void) {} > #endif > > +#ifdef CONFIG_IOMMU_SVA > +struct iommu_sva *iommu_sva_bind_device(struct device *dev, > + struct mm_struct *mm); > +void iommu_sva_unbind_device(struct iommu_sva *handle); > +u32 iommu_sva_get_pasid(struct iommu_sva *handle); > +#else > +static inline struct iommu_sva * > +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm) > +{ > + return NULL; > +} > + > +static inline void iommu_sva_unbind_device(struct iommu_sva *handle) > +{ > +} > + > +static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle) > +{ > + return IOMMU_PASID_INVALID; > +} > +#endif /* CONFIG_IOMMU_SVA */ > + > #endif /* __LINUX_IOMMU_H */ > diff --git a/drivers/iommu/iommu-sva-lib.c b/drivers/iommu/iommu-sva-lib.c > index 106506143896..197f68602439 100644 > --- a/drivers/iommu/iommu-sva-lib.c > +++ b/drivers/iommu/iommu-sva-lib.c > @@ -4,6 +4,7 @@ > */ > #include <linux/mutex.h> > #include <linux/sched/mm.h> > +#include <linux/iommu.h> > > #include "iommu-sva-lib.h" > > @@ -69,3 +70,112 @@ struct mm_struct *iommu_sva_find(ioasid_t pasid) > return ioasid_find(&iommu_sva_pasid, pasid, __mmget_not_zero); > } > EXPORT_SYMBOL_GPL(iommu_sva_find); > + > +/** > + * 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 mm_users > + * > + * 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) > +{ > + struct iommu_domain *domain; > + struct iommu_sva *handle; > + ioasid_t max_pasids; > + int ret; > + > + max_pasids = dev->iommu->max_pasids; > + if (!max_pasids) > + return ERR_PTR(-EOPNOTSUPP); > + > + /* Allocate mm->pasid if necessary. */ > + ret = iommu_sva_alloc_pasid(mm, 1, max_pasids - 1); > + if (ret) > + return ERR_PTR(ret); > + > + handle = kzalloc(sizeof(*handle), GFP_KERNEL); > + if (!handle) > + return ERR_PTR(-ENOMEM); > + > + mutex_lock(&iommu_sva_lock); > + /* Search for an existing domain. */ > + domain = iommu_get_domain_for_dev_pasid(dev, mm->pasid, > + IOMMU_DOMAIN_SVA); > + if (IS_ERR(domain)) { > + ret = PTR_ERR(domain); > + goto out_unlock; > + } > + > + if (domain) { > + domain->users++; > + goto out; > + } > + > + /* Allocate a new domain and set it on device pasid. */ > + domain = iommu_sva_domain_alloc(dev, mm); > + if (!domain) { > + ret = -ENOMEM; > + goto out_unlock; > + } > + > + ret = iommu_attach_device_pasid(domain, dev, mm->pasid); > + if (ret) > + goto out_free_domain; > + domain->users = 1; > +out: > + mutex_unlock(&iommu_sva_lock); > + handle->dev = dev; > + handle->domain = domain; > + > + return handle; > + > +out_free_domain: > + iommu_domain_free(domain); > +out_unlock: > + mutex_unlock(&iommu_sva_lock); > + kfree(handle); > + > + return ERR_PTR(ret); > +} > +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. > + */ > +void iommu_sva_unbind_device(struct iommu_sva *handle) > +{ > + struct iommu_domain *domain = handle->domain; > + ioasid_t pasid = domain->mm->pasid; > + struct device *dev = handle->dev; > + > + mutex_lock(&iommu_sva_lock); > + if (--domain->users == 0) { > + iommu_detach_device_pasid(domain, dev, pasid); > + iommu_domain_free(domain); > + } > + mutex_unlock(&iommu_sva_lock); > + kfree(handle); > +} > +EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); > + > +u32 iommu_sva_get_pasid(struct iommu_sva *handle) > +{ > + struct iommu_domain *domain = handle->domain; > + > + return domain->mm->pasid; > +} > +EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c > index 630e1b64ed89..1119fe39e842 100644 > --- a/drivers/iommu/iommu.c > +++ b/drivers/iommu/iommu.c > @@ -2785,97 +2785,6 @@ int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) > } > EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); > > -/** > - * 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) > -{ > - struct iommu_group *group; > - struct iommu_sva *handle = ERR_PTR(-EINVAL); > - const struct iommu_ops *ops = dev_iommu_ops(dev); > - > - if (!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); > - > -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. > - */ > -void iommu_sva_unbind_device(struct iommu_sva *handle) > -{ > - struct iommu_group *group; > - struct device *dev = handle->dev; > - const struct iommu_ops *ops = dev_iommu_ops(dev); > - > - if (!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); > - > -u32 iommu_sva_get_pasid(struct iommu_sva *handle) > -{ > - const struct iommu_ops *ops = dev_iommu_ops(handle->dev); > - > - if (!ops->sva_get_pasid) > - return IOMMU_PASID_INVALID; > - > - return ops->sva_get_pasid(handle); > -} > -EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); > - > /* > * Changes the default domain of an iommu group that has *only* one device > *
On 2022/8/30 15:30, Yuan Can wrote: > > 在 2022/8/26 20:11, Lu Baolu 写道: >> The existing iommu SVA interfaces are implemented by calling the SVA >> specific iommu ops provided by the IOMMU drivers. There's no need for >> any SVA specific ops in iommu_ops vector anymore as we can achieve >> this through the generic attach/detach_dev_pasid domain ops. >> >> This refactors the IOMMU SVA interfaces implementation by using the >> iommu_detach/detach_device_pasid interfaces and align them with the > > Did you mean using the iommu_attach/detach_device_pasid interfaces here? The device driver oriented SVA interfaces keep consistent as before. Here we only refactor the IOMMU internal implementation. Best regards, baolu
On 2022/8/30 15:45, Baolu Lu wrote: > On 2022/8/30 15:30, Yuan Can wrote: >> >> 在 2022/8/26 20:11, Lu Baolu 写道: >>> The existing iommu SVA interfaces are implemented by calling the SVA >>> specific iommu ops provided by the IOMMU drivers. There's no need for >>> any SVA specific ops in iommu_ops vector anymore as we can achieve >>> this through the generic attach/detach_dev_pasid domain ops. >>> >>> This refactors the IOMMU SVA interfaces implementation by using the >>> iommu_detach/detach_device_pasid interfaces and align them with the >> >> Did you mean using the iommu_attach/detach_device_pasid interfaces here? > > The device driver oriented SVA interfaces keep consistent as before. > Here we only refactor the IOMMU internal implementation. Oh! A typo in the commit message, right? Thanks and I will fix it. Best regards, baolu
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 836aa480961c..5b1e0f81eebb 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -643,6 +643,7 @@ struct iommu_fwspec { */ struct iommu_sva { struct device *dev; + struct iommu_domain *domain; }; int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, @@ -684,11 +685,6 @@ void iommu_release_device(struct device *dev); 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); -struct iommu_sva *iommu_sva_bind_device(struct device *dev, - struct mm_struct *mm); -void iommu_sva_unbind_device(struct iommu_sva *handle); -u32 iommu_sva_get_pasid(struct iommu_sva *handle); - int iommu_device_use_default_domain(struct device *dev); void iommu_device_unuse_default_domain(struct device *dev); @@ -1029,21 +1025,6 @@ iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) return -ENODEV; } -static inline struct iommu_sva * -iommu_sva_bind_device(struct device *dev, struct mm_struct *mm) -{ - return NULL; -} - -static inline void iommu_sva_unbind_device(struct iommu_sva *handle) -{ -} - -static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle) -{ - return IOMMU_PASID_INVALID; -} - static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev) { return NULL; @@ -1121,4 +1102,26 @@ void iommu_debugfs_setup(void); static inline void iommu_debugfs_setup(void) {} #endif +#ifdef CONFIG_IOMMU_SVA +struct iommu_sva *iommu_sva_bind_device(struct device *dev, + struct mm_struct *mm); +void iommu_sva_unbind_device(struct iommu_sva *handle); +u32 iommu_sva_get_pasid(struct iommu_sva *handle); +#else +static inline struct iommu_sva * +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm) +{ + return NULL; +} + +static inline void iommu_sva_unbind_device(struct iommu_sva *handle) +{ +} + +static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle) +{ + return IOMMU_PASID_INVALID; +} +#endif /* CONFIG_IOMMU_SVA */ + #endif /* __LINUX_IOMMU_H */ diff --git a/drivers/iommu/iommu-sva-lib.c b/drivers/iommu/iommu-sva-lib.c index 106506143896..197f68602439 100644 --- a/drivers/iommu/iommu-sva-lib.c +++ b/drivers/iommu/iommu-sva-lib.c @@ -4,6 +4,7 @@ */ #include <linux/mutex.h> #include <linux/sched/mm.h> +#include <linux/iommu.h> #include "iommu-sva-lib.h" @@ -69,3 +70,112 @@ struct mm_struct *iommu_sva_find(ioasid_t pasid) return ioasid_find(&iommu_sva_pasid, pasid, __mmget_not_zero); } EXPORT_SYMBOL_GPL(iommu_sva_find); + +/** + * 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 mm_users + * + * 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) +{ + struct iommu_domain *domain; + struct iommu_sva *handle; + ioasid_t max_pasids; + int ret; + + max_pasids = dev->iommu->max_pasids; + if (!max_pasids) + return ERR_PTR(-EOPNOTSUPP); + + /* Allocate mm->pasid if necessary. */ + ret = iommu_sva_alloc_pasid(mm, 1, max_pasids - 1); + if (ret) + return ERR_PTR(ret); + + handle = kzalloc(sizeof(*handle), GFP_KERNEL); + if (!handle) + return ERR_PTR(-ENOMEM); + + mutex_lock(&iommu_sva_lock); + /* Search for an existing domain. */ + domain = iommu_get_domain_for_dev_pasid(dev, mm->pasid, + IOMMU_DOMAIN_SVA); + if (IS_ERR(domain)) { + ret = PTR_ERR(domain); + goto out_unlock; + } + + if (domain) { + domain->users++; + goto out; + } + + /* Allocate a new domain and set it on device pasid. */ + domain = iommu_sva_domain_alloc(dev, mm); + if (!domain) { + ret = -ENOMEM; + goto out_unlock; + } + + ret = iommu_attach_device_pasid(domain, dev, mm->pasid); + if (ret) + goto out_free_domain; + domain->users = 1; +out: + mutex_unlock(&iommu_sva_lock); + handle->dev = dev; + handle->domain = domain; + + return handle; + +out_free_domain: + iommu_domain_free(domain); +out_unlock: + mutex_unlock(&iommu_sva_lock); + kfree(handle); + + return ERR_PTR(ret); +} +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. + */ +void iommu_sva_unbind_device(struct iommu_sva *handle) +{ + struct iommu_domain *domain = handle->domain; + ioasid_t pasid = domain->mm->pasid; + struct device *dev = handle->dev; + + mutex_lock(&iommu_sva_lock); + if (--domain->users == 0) { + iommu_detach_device_pasid(domain, dev, pasid); + iommu_domain_free(domain); + } + mutex_unlock(&iommu_sva_lock); + kfree(handle); +} +EXPORT_SYMBOL_GPL(iommu_sva_unbind_device); + +u32 iommu_sva_get_pasid(struct iommu_sva *handle) +{ + struct iommu_domain *domain = handle->domain; + + return domain->mm->pasid; +} +EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 630e1b64ed89..1119fe39e842 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2785,97 +2785,6 @@ int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat) } EXPORT_SYMBOL_GPL(iommu_dev_disable_feature); -/** - * 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) -{ - struct iommu_group *group; - struct iommu_sva *handle = ERR_PTR(-EINVAL); - const struct iommu_ops *ops = dev_iommu_ops(dev); - - if (!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); - -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. - */ -void iommu_sva_unbind_device(struct iommu_sva *handle) -{ - struct iommu_group *group; - struct device *dev = handle->dev; - const struct iommu_ops *ops = dev_iommu_ops(dev); - - if (!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); - -u32 iommu_sva_get_pasid(struct iommu_sva *handle) -{ - const struct iommu_ops *ops = dev_iommu_ops(handle->dev); - - if (!ops->sva_get_pasid) - return IOMMU_PASID_INVALID; - - return ops->sva_get_pasid(handle); -} -EXPORT_SYMBOL_GPL(iommu_sva_get_pasid); - /* * Changes the default domain of an iommu group that has *only* one device *