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iommu/vt-d: Implement SVM_FLAG_PRIVATE_PASID to allocate unique PASIDs

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Signed-off-by: David Woodhouse <[email protected]>
This commit is contained in:
David Woodhouse 2015-10-15 13:59:14 +01:00
commit 569e4f7782
3 changed files with 16 additions and 2 deletions
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6
drivers/iommu/intel-svm.c
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@ -285,11 +285,12 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
pasid_max = 1 << 20;
mutex_lock(&pasid_mutex);
if (pasid) {
if (pasid && !(flags & SVM_FLAG_PRIVATE_PASID)) {
int i;
idr_for_each_entry(&iommu->pasid_idr, svm, i) {
if (svm->mm != current->mm)
if (svm->mm != current->mm ||
(svm->flags & SVM_FLAG_PRIVATE_PASID))
continue;
if (svm->pasid >= pasid_max) {
@ -355,6 +356,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
svm->pasid = ret;
svm->notifier.ops = &intel_mmuops;
svm->mm = get_task_mm(current);
svm->flags = flags;
INIT_LIST_HEAD_RCU(&svm->devs);
ret = -ENOMEM;
if (!svm->mm || (ret = mmu_notifier_register(&svm->notifier, svm->mm))) {