leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

iommu/vt-d: Fix bind svm with multiple devices

Browse Source 
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>
This commit is contained in:
Jacob Pan 2019-05-08 12:22:46 -07:00 committed by Joerg Roedel
parent cd6c84d8f0
commit d7af4d987d
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/iommu/intel-svm.c
View File

@ -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);