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authorJacob Pan <jacob.jun.pan@linux.intel.com>2019-05-08 12:22:46 -0700
committerJoerg Roedel <jroedel@suse.de>2019-05-27 11:54:56 +0200
commitd7af4d987dfa31c5d715e940a447ea959f89e575 (patch)
treee876a96729aa4334e46a3b0b79861a96ee3e4e13 /drivers/iommu/intel-svm.c
parentcd6c84d8f0cdc911df435bb075ba22ce3c605b07 (diff)
iommu/vt-d: Fix bind svm with multiple devices
If multiple devices try to bind to the same mm/PASID, we need to set up first level PASID entries for all the devices. The current code does not consider this case which results in failed DMA for devices after the first bind. Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Reported-by: Mike Campin <mike.campin@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel-svm.c')
-rw-r--r--drivers/iommu/intel-svm.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index 8f87304f915c..421e4145a823 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -374,6 +374,21 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
}
list_add_tail(&svm->list, &global_svm_list);
+ } else {
+ /*
+ * Binding a new device with existing PASID, need to setup
+ * the PASID entry.
+ */
+ spin_lock(&iommu->lock);
+ ret = intel_pasid_setup_first_level(iommu, dev,
+ mm ? mm->pgd : init_mm.pgd,
+ svm->pasid, FLPT_DEFAULT_DID,
+ mm ? 0 : PASID_FLAG_SUPERVISOR_MODE);
+ spin_unlock(&iommu->lock);
+ if (ret) {
+ kfree(sdev);
+ goto out;
+ }
}
list_add_rcu(&sdev->list, &svm->devs);