iommu/vt-d: Implement SVM_FLAG_PRIVATE_PASID to allocate unique PASIDs (569e4f77) · Commits · 戴 / test

drivers/iommu/intel-svm.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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))) {

+1 −0

Original line number	Diff line number	Diff line
		@@ -489,6 +489,7 @@ struct intel_svm {
		struct mmu_notifier notifier;
		struct mm_struct *mm;
		struct intel_iommu *iommu;
		int flags;
		int pasid;
		struct list_head devs;
		};

+11 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,17 @@ struct svm_dev_ops {
		#define SVM_REQ_EXEC (1<<1)
		#define SVM_REQ_PRIV (1<<0)


		/*
		* The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is not the "main"
		* PASID for the current process. Even if a PASID already exists, a new one
		* will be allocated. And the PASID allocated with SVM_FLAG_PRIVATE_PASID
		* will not be given to subsequent callers. This facility allows a driver to
		* disambiguate between multiple device contexts which access the same MM,
		* if there is no other way to do so. It should be used sparingly, if at all.
		*/
		#define SVM_FLAG_PRIVATE_PASID (1<<0)

		/**
		* intel_svm_bind_mm() - Bind the current process to a PASID
		* @dev: Device to be granted acccess