On 2022/6/27 18:14, Tian, Kevin wrote:
From: Lu Baolu <baolu...@linux.intel.com>
Sent: Tuesday, June 21, 2022 10:44 PM
+struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct
mm_struct *mm)
+{
+ struct iommu_domain *domain;
+ ioasid_t max_pasids;
+ int ret = -EINVAL;
+
+ /* Allocate mm->pasid if necessary. */
this comment is for iommu_sva_alloc_pasid()
Updated.
+ max_pasids = dev->iommu->max_pasids;
+ if (!max_pasids)
+ return ERR_PTR(-EOPNOTSUPP);
+
+ ret = iommu_sva_alloc_pasid(mm, 1, max_pasids - 1);
+ if (ret)
+ return ERR_PTR(ret);
+
...
+void iommu_sva_unbind_device(struct iommu_sva *handle)
+{
+ struct device *dev = handle->dev;
+ struct iommu_domain *domain =
+ container_of(handle, struct iommu_domain, bond);
+ ioasid_t pasid = iommu_sva_get_pasid(handle);
+
+ mutex_lock(&iommu_sva_lock);
+ if (refcount_dec_and_test(&domain->bond.users)) {
+ iommu_detach_device_pasid(domain, dev, pasid);
+ iommu_domain_free(domain);
+ }
+ mutex_unlock(&iommu_sva_lock);
+}
+EXPORT_SYMBOL_GPL(iommu_sva_unbind_device);
+
+u32 iommu_sva_get_pasid(struct iommu_sva *handle)
+{
+ struct iommu_domain *domain =
+ container_of(handle, struct iommu_domain, bond);
+
+ return domain->mm->pasid;
+}
+EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
Looks this is only used by unbind_device. Just open code it.
It's part of current IOMMU/SVA interfaces for the device drivers, and
has been used in various drivers.
$ git grep iommu_sva_get_pasid
drivers/dma/idxd/cdev.c: pasid = iommu_sva_get_pasid(sva);
drivers/iommu/iommu-sva-lib.c: ioasid_t pasid =
iommu_sva_get_pasid(handle);
drivers/iommu/iommu-sva-lib.c:u32 iommu_sva_get_pasid(struct iommu_sva
*handle)
drivers/iommu/iommu-sva-lib.c:EXPORT_SYMBOL_GPL(iommu_sva_get_pasid);
drivers/misc/uacce/uacce.c: pasid = iommu_sva_get_pasid(handle);
include/linux/iommu.h:u32 iommu_sva_get_pasid(struct iommu_sva *handle);
include/linux/iommu.h:static inline u32 iommu_sva_get_pasid(struct
iommu_sva *handle)
Or, I missed anything?
Best regards,
baolu
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