iommu/vt-d: Avoid using idr_for_each_entry()
idr_for_each_entry() is used to iteratte over idr elements
of a given type. It isn't suitable for the globle pasid idr
since the pasid idr consumer could specify different types
of pointers to bind with a pasid.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Liu Yi L <yi.l.liu@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 2cc0aac..36cc1d1 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -298,6 +298,7 @@ static const struct mmu_notifier_ops intel_mmuops = {
};
static DEFINE_MUTEX(pasid_mutex);
+static LIST_HEAD(global_svm_list);
int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_ops *ops)
{
@@ -329,13 +330,13 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
mutex_lock(&pasid_mutex);
if (pasid && !(flags & SVM_FLAG_PRIVATE_PASID)) {
- int i;
+ struct intel_svm *t;
- idr_for_each_entry(&iommu->pasid_idr, svm, i) {
- if (svm->mm != mm ||
- (svm->flags & SVM_FLAG_PRIVATE_PASID))
+ list_for_each_entry(t, &global_svm_list, list) {
+ if (t->mm != mm || (t->flags & SVM_FLAG_PRIVATE_PASID))
continue;
+ svm = t;
if (svm->pasid >= pasid_max) {
dev_warn(dev,
"Limited PASID width. Cannot use existing PASID %d\n",
@@ -404,6 +405,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
svm->mm = mm;
svm->flags = flags;
INIT_LIST_HEAD_RCU(&svm->devs);
+ INIT_LIST_HEAD(&svm->list);
ret = -ENOMEM;
if (mm) {
ret = mmu_notifier_register(&svm->notifier, mm);
@@ -430,6 +432,8 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
*/
if (cap_caching_mode(iommu->cap))
intel_flush_pasid_dev(svm, sdev, svm->pasid);
+
+ list_add_tail(&svm->list, &global_svm_list);
}
list_add_rcu(&sdev->list, &svm->devs);
@@ -485,6 +489,8 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
if (svm->mm)
mmu_notifier_unregister(&svm->notifier, svm->mm);
+ list_del(&svm->list);
+
/* We mandate that no page faults may be outstanding
* for the PASID when intel_svm_unbind_mm() is called.
* If that is not obeyed, subtle errors will happen.